JP2018170891A - Stator for rotary electric machine and driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a technique capable of, in the case where a coil includes a plurality of coil parts different in arrangement region in the circumferential direction, winding each of the coil parts appropriately around a stator core while suppressing a size increase of a coil end part.SOLUTION: A forward path turn 41 and a return path turn 42 are arranged with a shift from each other in a circumferential direction C, and the forward path turn 41 and the return path turn 42 adjacent to each other in the order of conducting direction are connected at an end on the same side in the circumferential direction C. An intermediate region A1 of a first coil part and the intermediate region A1 of a second coil part are arranged in different slots 23. An end region A2 of the first coil part and the end region A2 of the second coil part are arranged in the same slot 23. In the slot 23, slot housing parts 38 of the same number as the intermediate regions A1 of the first coil part and the second coil part together are arranged.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a stator for a rotating electrical machine, and a drive device including the rotating electrical machine and an inverter.

  An example of the driving device as described above is described in Japanese Patent Application Laid-Open No. 2017-17888 (Patent Document 1). As shown in FIG. 1 of Patent Literature 1, the driving device of Patent Literature 1 includes a motor generator (11) and an inverter (12) that drives the motor generator (11). The inverter (12) includes an inverter circuit configured by using a plurality of switching elements (Sup to Swn), and each switching element is individually controlled to be switched, and AC power is supplied from the inverter circuit to each phase stator winding. Is supplied, the motor generator (11) is driven. In the description of the background art, the reference numerals shown in parentheses are those of Patent Document 1.

  By the way, although patent document 1 does not describe the specific configuration of the coil wound around the stator core, depending on the electrical connection relationship of the coil, the configuration of the drive circuit such as an inverter, etc., the coil is arranged in the circumferential direction. It may be appropriate to have a configuration including a plurality of coil portions having different arrangement regions. In such a case, as a matter of course, it is desired that each coil part can be appropriately wound around the stator core while suppressing an increase in the size of the coil end part. However, Patent Document 1 does not describe this point.

JP 2017-17888 (FIG. 1 etc.)

  Therefore, when the coil includes a plurality of coil portions having different arrangement regions in the circumferential direction, it is desired to realize a technique capable of appropriately winding each coil portion around the stator core while suppressing an increase in the size of the coil end portion. It is.

  In view of the above, a characteristic configuration of a stator for a rotating electrical machine including a stator core in which a plurality of slots are formed in the circumferential direction and a coil wound around the stator core is such that the coil is disposed in the slot. A slot housing portion and a crossing portion that connects the pair of slot housing portions outside the slot, and the coil is disposed in a first region that is a partial region in the circumferential direction. A coil portion and a second coil portion disposed in a second region that is a circumferential region that partially overlaps the first region, and each of the first coil portion and the second coil portion includes The crossing portion has a plurality of wave-like turns arranged alternately on one side and the other side in the extending direction of the slot toward one side in the circumferential direction, and the first coil portion and the first coil Each of the two coil parts Then, an outward turn that is the wavy turn toward the one side in the circumferential direction along the conductive direction of each coil portion, and a return turn that is the wavy turn toward the other side in the circumferential direction, The forward turn and the backward turn, which are arranged to be shifted from each other in the circumferential direction and are adjacent to each other in the order of the conductive direction, are connected at the end on the same side in the circumferential direction, and the first coil portion and the first coil portion In each of the two coil portions, an area where both the forward turn and the backward turn are arranged in one slot is an intermediate area, and an area formed on both sides in the circumferential direction with respect to the intermediate area. An area where only one of the forward turn and the backward turn is disposed in one slot is an end area, and the intermediate area of the first coil section and the intermediate area of the second coil section Are disposed in the different slots, and the end region of the first coil portion and the end region of the second coil portion are disposed in the same slot, and the first coil portion includes the first region in the slot. The number of the slot accommodating portions is the same as the number of the intermediate regions including the coil portion and the second coil portion.

According to said characteristic structure, in a structure provided with a 1st coil part arrange | positioned at a 1st area | region, and a 2nd coil part arrange | positioned at a 2nd area | region partially overlapping with a 1st area | region in a coil, In each of the first coil portion and the second coil portion, the forward path turn and the backward path turn adjacent in the order of the conductive direction are connected at the end on the same side in the circumferential direction. On the other hand, if the forward turns or the backward turns adjacent to each other in the order of the conductive direction are connected, it is necessary to connect the ends on the opposite sides in the circumferential direction in the two wavy turns, The end is easy to enlarge. However, as described above, the forward turn and the return turn adjacent in the order of the conductive direction are connected at the end on the same side in the circumferential direction, so that two corrugated shapes adjacent in the order of the conductive direction are provided. It is possible to keep the length of the connecting portion connecting the turn outside the slot short. Therefore, the enlargement of the coil end portion can be suppressed.
Since the forward turn and the return turn that are adjacent to each other in the order of the conductive direction are arranged so as to be shifted from each other in the circumferential direction, each of the first coil portion and the second coil portion has a forward turn and a return route in one slot. In addition to the intermediate region in which both the turns are arranged, an end region in which only one of the forward turn and the backward turn is arranged is formed in one slot. In this regard, according to the above-described characteristic configuration, the intermediate region of the first coil unit and the intermediate region of the second coil unit are arranged in different slots, and the end region of the first coil unit and the second coil unit The end region is disposed in the same slot, and the same number of slot accommodating portions as the intermediate region are disposed in the slot together with the first coil portion and the second coil portion. That is, in the state where both the first coil portion and the second coil portion are wound around the stator core, the number of slot accommodating portions in each slot can be made the same, so that the space in the slot is effectively utilized. A coil including the first coil portion and the second coil portion can be appropriately wound around the stator core.
As described above, according to the above-described characteristic configuration, when the coil includes a plurality of coil portions having different arrangement regions in the circumferential direction, each coil portion is appropriately wound around the stator core while suppressing an increase in the size of the coil end portion. Can be disguised.

  Further features and advantages of the technology according to the present disclosure will become clear from the following description of embodiments described with reference to the drawings.

Diagram showing an example of a rotating electrical machine Sectional drawing orthogonal to the axial direction of a part of stator according to the embodiment Schematic configuration diagram of a drive device according to an embodiment The figure which shows an example of each waveform when there is no shift | offset | difference of switching timing between a 1st inverter circuit and a 2nd inverter circuit The figure which shows an example of each waveform in case there exists a shift | offset | difference of switching timing between a 1st inverter circuit and a 2nd inverter circuit. Sectional drawing orthogonal to the axial direction of the stator which concerns on embodiment Partial enlarged view of FIG. The figure which shows the arrangement | positioning state of the 1st U-phase coil part and 2nd U-phase coil part which concern on embodiment Exploded view of the first U-phase coil part and the second U-phase coil part according to the embodiment The figure which shows the arrangement | positioning state of the 1st coil part which concerns on a comparative example, and a 2nd coil part The figure which shows the winding aspect to the stator core of the wave-like turn which concerns on a comparative example

  Embodiments of a stator for a rotating electrical machine and a drive device will be described with reference to the drawings. In the following description, “axial direction L”, “radial direction R”, and “circumferential direction C” are the axis X (cylindrical inner circumferential surface) of stator core 22 that is the core of stator 21 (stator for rotating electrical machine). Or, the axis of the outer peripheral surface) is defined as a reference. The axis X is a virtual axis, and the rotor 25 of the rotating electrical machine 20 rotates around the axis X. In this specification, “rotary electric machine” is used as a concept including a motor (electric motor), a generator (generator), and a motor / generator that performs both functions of the motor and the generator as necessary. Yes. Further, in this specification, terms related to dimensions, arrangement direction, arrangement position, and the like are used as a concept including a state having a difference due to an error (an error that is acceptable in manufacturing).

  As shown in FIG. 3, the drive device 1 includes a rotating electrical machine 20 and an inverter 50 that drives the rotating electrical machine 20. As shown in FIG. 1, the rotating electrical machine 20 includes a rotor 25 and a stator 21. In the example shown in FIG. 1, the rotating electrical machine 20 is housed in the case 2, the stator 21 (stator core 22) is fixed to the inner surface of the case 2, and the rotor 25 is rotatably supported with respect to the case 2. The rotating electrical machine 20 is a rotating field type rotating electrical machine (synchronous rotating electrical machine in this embodiment), and a rotor as a field provided with a permanent magnet, an electromagnet, or the like by a rotating magnetic field generated from a stator 21 as an armature. 25 rotates. In the present embodiment, the rotating electrical machine 20 is a radial gap type rotating electrical machine. Specifically, the rotating electrical machine 20 is an inner rotor type rotating electrical machine, and the rotor 25 is located inside the stator 21 (stator core 22) in the radial direction R and seen from the stator 21 (stator core 22) in the radial direction R. It is arranged at the overlapping position.

  As shown in FIG. 2, the stator 21 includes a stator core 22 having a plurality of slots 23 formed in the circumferential direction C, and a coil 30 wound around the stator core 22. That is, the rotating electrical machine 20 includes a stator core 22 and a coil 30 wound around the stator core 22. The stator core 22 includes a plurality of slots 23 (48 slots 23 in the present embodiment, see FIG. 6) distributed in the circumferential direction C. The plurality of slots 23 are arranged at regular intervals along the circumferential direction C. A tooth 24 is formed between two slots 23 adjacent to each other in the circumferential direction C. Each of the slots 23 is formed to extend in the axial direction L and the radial direction R. In the present embodiment, each of the slots 23 has openings on both sides in the axial direction L, and also has openings on the rotor 25 side in the radial direction R (here, inside the radial direction R).

  As shown in FIG. 2, the coil 30 includes a slot accommodating portion 38 disposed in the slot 23. In the present embodiment, six slot accommodating portions 38 are arranged in one slot 23. A plurality of slot accommodating portions 38 (here, six slot accommodating portions 38) arranged in one slot 23 are aligned inside the slot 23. Specifically, the radial direction R is aligned in a row. Are arranged along the line. As shown in FIG. 9, the coil 30 includes a crossover portion 39 that connects the pair of slot accommodating portions 38 outside the slot 23. The crossover portion 39 is arranged on one side or the other side in the extending direction of the slot 23 (here, the axial direction L) with respect to the stator core 22. And the coil end part 3 (refer FIG. 1) is formed of the aggregate | assembly of the some transition part 39 (including the connection part 43 mentioned later). In the present embodiment, the slot accommodating portion 38 is disposed so as to extend in the axial direction L inside the slot 23, and the transition portion 39 is disposed on the outer side in the axial direction L with respect to the stator core 22. Therefore, in the present embodiment, the coil end portion 3 is formed so as to protrude on both sides in the axial direction L with respect to the stator core 22. In FIG. 9, the coil 30 (a wave-like turn 40 described later) is shown in a state of being flattened in the circumferential direction C so that the inner side in the radial direction R is the front side of the drawing.

  The coil 30 is a multi-phase coil, and is wound around the stator core 22 so that the slot 23 for each phase repeatedly appears in the circumferential direction C. In the present embodiment, the coil 30 is a three-phase coil. As shown in FIG. 6, the U-phase slot 23, the V-phase slot 23, and the W-phase slot 23 are arranged along the circumferential direction C. The coil 30 is wound around the stator core 22 so as to appear repeatedly. In the present embodiment, the coil 30 is wound around the stator core 22 such that the number of slots 23 per phase per phase is plural. That is, the number of slots 23 per pole per phase is N, and the coil 30 is wound around the stator core 22 so that N is plural. Specifically, the coil 30 is wound around the stator core 22 such that the number of slots 23 per phase per phase is “2”, and the slots 23 for each phase are 2 along the circumferential direction C. A coil 30 is wound around the stator core 22 so as to repeatedly appear one by one.

  As shown in FIG. 3, the coil 30 includes a first coil portion 31 and a second coil portion 32. The first coil part 31 and the second coil part 32 are electrically insulated from each other. That is, an electric circuit for supplying AC power from the inverter 50 to the first coil unit 31 (an electric circuit including the first coil unit 31 and the power line connecting the first coil unit 31 and the inverter 50) and the inverter 50 and an electric circuit for supplying AC power to the second coil part 32 (power line connecting the second coil part 32 and the inverter 50 and an electric circuit including the second coil part 32) independently of each other. The inverter 50 is configured to supply AC power to the first coil unit 31 and the second coil unit 32 independently of each other.

  In this embodiment, since the coil 30 is a three-phase coil, as shown in FIG. 3, the first coil unit 31 includes a first U-phase coil unit 31u, a first V-phase coil unit 31v, and a first W-phase coil. The second coil unit 32 includes three phase coil units, a second U-phase coil unit 32u, a second V-phase coil unit 32v, and a second W-phase coil unit 32w. . And in this embodiment, the three phase coil parts which comprise the 1st coil part 31 are connected by the star connection, and the three phase coil parts which comprise the 2nd coil part 32 are connected by the star connection. That is, in this embodiment, both the 1st coil part 31 and the 2nd coil part 32 are star connection bodies. Specifically, one end of each of the first U-phase coil unit 31u, the first V-phase coil unit 31v, and the first W-phase coil unit 31w is connected to each other at a neutral point (first neutral point 61). The other end of each of the first U-phase coil unit 31u, the first V-phase coil unit 31v, and the first W-phase coil unit 31w is a connection terminal provided for each phase (power line terminal to which a power line is connected) )It is connected to the. In addition, one end of each of the second U-phase coil unit 32u, the second V-phase coil unit 32v, and the second W-phase coil unit 32w is connected to each other at a neutral point (second neutral point 62), The other end of each of the 2U-phase coil unit 32u, the second V-phase coil unit 32v, and the second W-phase coil unit 32w is connected to a connection terminal (power line terminal) provided for each phase. The second neutral point 62 is formed independently of the first neutral point 61 (that is, electrically insulated). In addition, each connection terminal of the second coil portion 32 is formed independently of each connection terminal of the first coil portion 31 (that is, electrically insulated).

  As shown in FIG. 3, the inverter 50 includes a first inverter circuit 51 that supplies AC power to the first coil unit 31, and a second inverter circuit 52 that supplies AC power to the second coil unit 32. Yes. Each of the first inverter circuit 51 and the second inverter circuit 52 is a circuit that converts electric power between DC power and plural-phase (three-phase in this embodiment) AC power. The first inverter circuit 51 and the second inverter circuit 52 are connected in parallel to each other with respect to the DC power supply 53 (battery, capacitor, etc.). When the rotating electrical machine 20 functions as a motor, the first inverter circuit 51 converts the DC power supplied from the DC power source 53 into AC power and supplies the AC power to the first coil unit 31, and the second inverter circuit. 52 converts the DC power supplied from the DC power supply 53 into AC power and supplies the AC power to the second coil unit 32. When the rotating electrical machine 20 functions as a generator, the first inverter circuit 51 converts AC power supplied from the first coil unit 31 into DC power and supplies the DC power to the DC power source 53, and the second inverter circuit. 52 converts the AC power supplied from the second coil unit 32 into DC power and supplies it to the DC power supply 53.

  Between the DC power supply 53 and the first inverter circuit 51 and the second inverter circuit 52, a smoothing capacitor 54 for smoothing the voltage between the positive and negative electrodes is provided. In FIG. 3, a case where a common smoothing capacitor 54 is provided in the first inverter circuit 51 and the second inverter circuit 52 is shown as an example. However, a smoothing capacitor is provided for each of the first inverter circuit 51 and the second inverter circuit 52. It may be provided separately. Although not shown, a contactor is provided between the DC power supply 53 and the smoothing capacitor 54 to disconnect the electrical connection between the DC power supply 53 and the circuit from the smoothing capacitor 54 to the rotating electrical machine 20. ing.

  Each of the first inverter circuit 51 and the second inverter circuit 52 is configured by a bridge circuit. As shown in FIG. 3, this bridge circuit is configured by a bridge circuit having a number of arms corresponding to the number of phases (in this embodiment, a number equal to the number of phases). Specifically, this bridge circuit has one arm corresponding to each of the U phase, the V phase, and the W phase, and the three arms are connected in parallel to form a bridge circuit. One arm is constituted by a series circuit of two switching elements 55. The intermediate points of the three arms in the first inverter circuit 51 (connection points of the two switching elements 55) are respectively connected to the three power line terminals of the first coil unit 31, and in the second inverter circuit 52. The intermediate points of the three arms (connection points of the two switching elements 55) are connected to the three power line terminals of the second coil section 32, respectively. A free wheel diode is connected in parallel to each of the switching elements 55. Although FIG. 3 illustrates an example in which an IGBT (Insulated Gate Bipolar Transistor) is used as the switching element 55, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) or the like may be used as the switching element 55.

  As shown in FIG. 3, the drive device 1 includes a control device 10 that generates a switching control signal (in this embodiment, a gate drive signal) for switching control of the inverter 50. The control device 10 is constructed with a logic circuit such as a microcomputer as a core member, and each function of the control device 10 is realized by cooperation of hardware such as a microcomputer and software (program). The control device 10 may be configured by a set of a plurality of hardware (a plurality of separated hardware) that can communicate with each other.

  The driving device 1 includes a first driving circuit 11 that drives the first inverter circuit 51 based on the switching control signal input from the control device 10, and a second inverter circuit that is based on the switching control signal input from the control device 10. And a second drive circuit 12 for driving 52. A control terminal (in this embodiment, a gate terminal) of each switching element 55 configuring the first inverter circuit 51 is connected to the control device 10 via the first drive circuit 11, and the first inverter circuit 51 is configured. The plurality of switching elements 55 are individually controlled by the control device 10. In addition, the control terminal (in this embodiment, the gate terminal) of each switching element 55 constituting the second inverter circuit 52 is connected to the control device 10 via the second drive circuit 12, and the second inverter circuit 52. Are controlled individually by the control device 10. The first drive circuit 11 and the second drive circuit 12 increase (amplify) the drive capability of the switching control signal generated by the control device 10 (for example, the capability of operating the subsequent circuit such as voltage amplitude and output current). And a circuit relaying to the inverter 50 (switching element 55).

  As described above, the coil 30 includes the first coil unit 31 and the second coil unit 32 that are electrically insulated from each other, and the inverter 50 includes the first inverter circuit 51 that supplies AC power to the first coil unit 31. The first inverter circuit 51 and the second inverter circuit 52 share the AC power supplied to the rotating electrical machine 20 by providing the second inverter circuit 52 that supplies AC power to the second coil unit 32. can do. As a result, the capacity required for each of the first inverter circuit 51 and the second inverter circuit 52 is kept small, and the capacity of the entire inverter is increased, that is, the AC that can be supplied from the inverter 50 to the rotating electrical machine 20. It is possible to improve the magnitude of electric power. On the other hand, in the case of such a configuration, due to a shift in switching timing between the first inverter circuit 51 and the second inverter circuit 52, the first coil unit 31 and the second coil unit 32 There may be a difference in current amplitude as described below.

  This difference in current amplitude will be described with reference to FIGS. In each of FIGS. 4 and 5, gate driving signals (Vu1, Vv1, Vw1) of each phase for the first coil unit 31, and phases (U-V, V-) of the first coil unit 31 are shown. The line voltage (Vuv1, Vvw1, Vwu1) between W and W-U, the gate drive signal (Vu2, Vv2, Vw2) of each phase for the second coil unit 32, and the second coil unit 32 The line voltage (Vuv2, Vvw2, Vwu2) between the phases (between U-V, V-W, and W-U), the first U-phase current (Iu1) flowing through the first U-phase coil unit 31u, and An example of each waveform of the second U-phase current (Iu2) flowing through the second U-phase coil unit 32u is shown with the horizontal axis as time. When the gate drive signal is at a high level, the switching element 55 on the upper side (positive side) of the two switching elements 55 constituting one arm is turned on and the lower side (negative side) ) Switching element 55 is turned off. When the gate drive signal is at a low level, the upper switching element 55 of the two switching elements 55 constituting one arm is turned off and the lower switching element 55 is turned on. It is said.

  4 shows an example of each waveform when there is no deviation in switching timing between the first inverter circuit 51 and the second inverter circuit 52, and FIG. 5 shows the first inverter circuit 51 and the second inverter circuit. 52, the switching timing of the second inverter circuit 52 is, specifically, each waveform when the switching timing of the second inverter circuit 52 is delayed by ΔT with respect to the switching timing of the first inverter circuit 51. An example is shown. As shown in FIG. 4, when there is no switching timing difference between the first inverter circuit 51 and the second inverter circuit 52, it is between the first U-phase current (Iu1) and the second U-phase current (Iu2). There is basically no difference in amplitude. On the other hand, as shown in FIG. 5, when there is a switching timing difference between the first inverter circuit 51 and the second inverter circuit 52, the first U-phase current (Iu1) and the second U-phase current (Iu2) A difference in amplitude may occur between the two. In FIG. 5, for comparison, the waveform of the U-phase current (Iu1, Iu2) shown in FIG. 4 is indicated by a one-dot chain line.

  More specifically, in FIG. 5, focusing on the time point when the voltage between U and V (Vuv1, Vuv2) changes from the low level to the high level (the time point indicating ΔT), the first inverter circuit 51 and the second inverter circuit Due to the deviation of the switching timing with the circuit 52, the U-V voltage (Vuv1) of the first coil unit 31 starts from a low level at a point earlier than the U-V voltage (Vuv2) of the second coil unit 32. Change to high level. Therefore, although the first U-phase current (Iu1) starts to increase from this time, the second U-phase current (Iu2) starts to increase at a time after ΔT from this time. Here, when the magnetic circuit formed by the current flowing through the first coil portion 31 and the magnetic circuit formed by the current flowing through the second coil portion 32 are completely independent, the second U-phase current (Iu2 ) Is not affected by the change in the first U-phase current (Iu1), the waveform of the second U-phase current (Iu2) is a waveform obtained by delaying the waveform of the first U-phase current (Iu1) by ΔT. The difference in amplitude between (Iu1) and the second U-phase current (Iu2) is not so great.

  On the other hand, when the independence between the magnetic circuit formed by the current flowing through the first coil portion 31 and the magnetic circuit formed by the current flowing through the second coil portion 32 is low, the first U-phase current (Iu1) In the period from the time when the first U-phase current (Iu2) starts to rise to the time when the second U-phase current (Iu2) starts to rise (a period indicated by ΔT), the second U-phase current (Iu1) changes due to the change in the magnetic flux in the stator core 22 A phenomenon may occur in which the electromotive voltage of the second U-phase coil unit 32u changes in the direction in which the phase current (Iu2) decreases. FIG. 5 shows the waveform of the U-phase current (Iu1, Iu2) when such a phenomenon occurs, and the second U-phase current (Iu2) decreases at a larger decrease rate than before during the period indicated by ΔT. ing. As a result, the value of the second phase current (Iu2) at the time when the second phase current (Iu2) starts to rise is equal to the value of the first phase current (Iu1) at the time when the first U phase current (Iu1) starts to rise. The value is much lower than the value, and a relatively large difference in amplitude occurs between the first U-phase current (Iu1) and the second phase current (Iu2). Although illustration is omitted, between the current flowing through the first V-phase coil unit 31v and the current flowing through the second V-phase coil unit 32v, the current flowing through the first W-phase coil unit 31w and the current flowing through the second W-phase coil unit 32w Similarly, a relatively large amplitude difference may occur between the two.

  In order to drive the rotating electrical machine 20 appropriately, it is preferable that the difference in current amplitude between the first coil unit 31 and the second coil unit 32 is small. As a measure for suppressing an increase in the difference in current amplitude between the first coil unit 31 and the second coil unit 32, a shift in switching timing between the first inverter circuit 51 and the second inverter circuit 52 is performed. (ΔT in FIG. 5) is reduced, and independence between the magnetic circuit formed by the current flowing through the first coil portion 31 and the magnetic circuit formed by the current flowing through the second coil portion 32 is increased. Can be considered.

  In the present embodiment, the control device 10 is common to the first drive circuit 11 and the second drive circuit 12 in order to reduce a shift in switching timing between the first inverter circuit 51 and the second inverter circuit 52. The switching control signal (in this example, a gate drive signal) is output. By configuring the control device 10 in this way, a switching control signal output from the control device 10 to the first drive circuit 11 and a switching control signal output from the control device 10 to the second drive circuit 12 for each phase. Compared with a case where a control device that outputs a switching control signal to the first drive circuit 11 and a control device that outputs a switching control signal to the second drive circuit 12 are provided separately. Thus, it is easy to reduce the switching timing shift between the first inverter circuit 51 and the second inverter circuit 52.

  In this embodiment, in order to increase the independence between the magnetic circuit formed by the current flowing through the first coil portion 31 and the magnetic circuit formed by the current flowing through the second coil portion 32, FIG. As shown, the first coil portion 31 and the second coil portion 32 are arranged in different regions in the circumferential direction C. As described above, the coil 30 is a multi-phase coil, and the first coil portion 31 and the second coil portion 32 are arranged in different regions in the circumferential direction C for each phase. 6 and FIG. 7 and FIG. 8 to be referred to later, only the slot accommodating portion 38 of the first coil portion 31 is hatched to facilitate the distinction between the first coil portion 31 and the second coil portion 32. Has been given.

  The U phase will be described in detail. As shown in FIG. 6, the first U phase coil portion 31u is disposed in the first region C1, which is a partial region in the circumferential direction C, and the second U phase coil portion 32u is It is arranged in a region in the circumferential direction C different from the first region C1 (specifically, a second region C2 that is a region in the circumferential direction C partially overlapping with the first region C1). As shown in FIG. 9, the first region C1 is defined to include a plurality of slot accommodating portions 38 and a plurality of crossover portions 39 included in the first U-phase coil portion 31u, and the second region C2 is defined as a second U-phase coil. It is determined to include a plurality of slot accommodating portions 38 and a plurality of crossover portions 39 provided in the portion 32u. In the present embodiment, the first region C1 and the second region C2 are regions having the same size. In the present embodiment, the second region C2 overlaps the first region C1 at each of both ends in the circumferential direction C, and the first coil portion 31 and the second coil portion 32 are wound around the stator core 22. As a result, the slot accommodating portions 38 are arranged in all the slots 23. Although illustration of the first region C1 and the second region C2 for the V phase and the W phase is omitted, as is apparent from FIG. 6, the first V phase coil portion 31v is a partial region in the circumferential direction C. Arranged in one area, the second V-phase coil portion 32v is arranged in a second area that is an area in the circumferential direction C that partially overlaps the first area (the first area in which the first V-phase coil section 31v is arranged). Has been. The first W-phase coil unit 31w is disposed in a first region which is a partial region in the circumferential direction C, and the second W-phase coil unit 32w is disposed in the first region (the first W-phase coil unit 31w is disposed). The first region is disposed in a second region that is a region in the circumferential direction C that partially overlaps the first region.

  Thus, the 1st coil part 31 and the 2nd coil part 32 are divided into the 1st field C1 and the 2nd field C2 which are mutually different fields of the peripheral direction C, and are set as the 1st coil. Compared to the case where the part 31 and the second coil part 32 are arranged at the same position in the circumferential direction C, the magnetic circuit formed in the stator core 22 by the current flowing through the first coil part 31 and the second coil part 32 It is possible to increase the independence with the magnetic circuit formed in the stator core 22 by the flowing current. As described above, even when the control device 10 outputs a common switching control signal to the first drive circuit 11 and the second drive circuit 12, variations in characteristics of the switching elements 55 and the switching devices 55 from the control device 10. The switching timing between the first inverter circuit 51 and the second inverter circuit 52 may be shifted to some extent due to variations in the length of the signal transmission path until the current flowing through the first coil section 31 in this way. By increasing the independence between the magnetic circuit formed by the magnetic circuit formed by the current flowing through the second coil portion 32, the current amplitude between the first coil portion 31 and the second coil portion 32 can be increased. The difference can be kept small.

  Each of the first coil portion 31 and the second coil portion 32 is wound around the stator core 22 in a wave shape. Specifically, as shown in FIG. 9, each of the first coil portion 31 and the second coil portion 32 has a crossing portion 39 extending in one direction in the circumferential direction C and the extending direction of the slot 23 (here, the axis). A plurality of wave-like turns 40 are alternately arranged on one side and the other side in the direction L). In this embodiment, since the 1st coil part 31 and the 2nd coil part 32 are star connection bodies, each of the wave-like turn 40 is the power line side edge part 40a used as the power line side along an energization direction, and And a neutral point side end 40b which is on the neutral point side along the energizing direction. As shown in FIG. 9, the plurality of corrugated turns 40 included in the first coil portion 31 are connected in series to each other in the same phase, and the plurality of corrugated turns 40 included in the second coil portion 32. Are in-phase with each other and are connected in series. In FIG. 9, only the waved turn 40 constituting the first U-phase coil part 31u and the waved turn 40 constituting the second U-phase coil part 32u are shown, but the arrangement positions in the circumferential direction C are different. Except for this point, the corrugated turn 40 of the other phase is similarly configured.

  As shown in FIG. 9, the first coil part 31 (first U-phase coil part 31u) and the second coil part 32 (second U-phase coil part 32u) are electrically conductive in each coil part (linear conductors constituting the coil). A forward turn 41 that is a wave-like turn 40 that goes to one side in the circumferential direction C and a return turn 42 that is a wave-like turn 40 that goes to the other side in the circumferential direction C. Yes. Here, the undulated turn 40 that goes to the right side (clockwise direction in FIG. 8) along the energization direction from the power line side end 40a to the neutral point side end 40b is defined as the forward turn 41, and the power A wave-like turn 40 that goes to the left side in FIG. 9 (counterclockwise direction in FIG. 8) along the energization direction from the line side end 40a to the neutral point side end 40b is defined as a return turn 42. Here, the up, down, left, and right directions in FIG. 9 are directions in a direction in which the code shown in FIG. 9 can be read. In FIG. 8 and FIG. 9, in order to facilitate understanding, slot numbers given in order toward one side in the circumferential direction C are shown corresponding to each of the slots 23.

  In each of the first coil portion 31 and the second coil portion 32, the forward turn 41 and the backward turn 42 are arranged so as to be shifted from each other in the circumferential direction C, and the forward turn 41 and the backward route that are adjacent in the order of the conductive direction. The turn 42 is connected to the end portion on the same side in the circumferential direction C. Further, in each of the first coil portion 31 and the second coil portion 32, an area where both the forward turn 41 and the return turn 42 are arranged in one slot 23 is defined as an intermediate area A1, and the intermediate area A1 An area formed on both sides in the circumferential direction C and in which only one of the forward path turn 41 and the backward path turn 42 is disposed in one slot 23 is defined as an end area A2 and is intermediate between the first coil sections 31. The region A1 and the intermediate region A1 of the second coil portion 32 are arranged in different slots 23, and the end region A2 of the first coil portion 31 and the end region A2 of the second coil portion 32 are in the same slot 23. In the slot 23, the same number of slot accommodating portions 38 as the intermediate region A <b> 1 are arranged together with the first coil portion 31 and the second coil portion 32. The arrangement configuration of the first coil portion 31 and the second coil portion 32 will be specifically described below for the U phase. Although details are omitted, the first coil portion 31 and the second coil portion 32 of the other phase are configured similarly except that the arrangement position in the circumferential direction C is different.

  As shown in FIG. 9, the forward turn 41 and the backward turn 42 included in the first U-phase coil portion 31 u include the same number of slot accommodating portions 38 (even in this embodiment, specifically four). I have. The forward path turn 41 and the backward path turn 42 included in the first U-phase coil portion 31u are arranged so as to be shifted from each other in the circumferential direction C. Specifically, with the one side (right side in FIG. 9) in the circumferential direction C as the first side, the first slot accommodating portion 38 among the plurality of slot accommodating portions 38 included in the forward turn 41 is disposed. The slot 23 and the slot 23 in which the second slot accommodating portion 38 from the first side among the plurality of slot accommodating portions 38 included in the return turn 42 is arranged are the same slot 23 or the same in-phase slot group. The return turn 42 is arranged so as to be shifted to the first side with respect to the forward turn 41 so as to be the slot 23 that constitutes. Here, the “in-phase slot group” is a group of N (two in this embodiment) in-phase slots 23 adjacent in the circumferential direction C. The forward turn 41 and the return turn 42 provided in the second U-phase coil part 32u are configured in the same manner as the forward turn 41 and the return turn 42 provided in the first U-phase coil part 31u except that the arrangement positions in the circumferential direction C are different. ing. In addition, the number of the wave-like turns 40 used for the first U-phase coil part 31u is equal to the number of the wave-like turns 40 used for the second U-phase coil part 32u. Specifically, the number of forward turns 41 used for the first U-phase coil unit 31u is equal to the number of forward turns 41 used for the second U-phase coil unit 32u, and the return turn 42 used for the first U-phase coil unit 31u. Is equal to the number of return turns 42 used for the second U-phase coil section 32u. Further, in the present embodiment, the number of forward turns 41 used for the first U-phase coil unit 31u or the second U-phase coil unit 32u is equal to the number of return turns 42 used for the first U-phase coil unit 31u or the second U-phase coil unit 32u. Equal to a number.

  In each of the first U-phase coil portion 31u and the second U-phase coil portion 32u, one power line side end portion 40a and the other neutral point side end portion 40b of the forward path turn 41 and the return path turn 42 are provided in the slot 23. Are connected by a connecting portion 43 outside (here, outside in the axial direction L). The connecting portion 43 is also a crossover portion 39 that connects the pair of slot accommodating portions 38 on the outside of the slot 23, but is connected to a pair of slot accommodating portions 38 belonging to different wave-like turns 40. This is different from the crossover portion 39 provided in the wave-like turn 40. As shown in FIG. 9, the forward turn 41 and the return turn 42 are connected in this manner because the arrangement relationship in the circumferential direction C between the power line side end 40a and the neutral point side end 40b is opposite to each other. By connecting one power line side end portion 40a and the other neutral point side end portion 40b of the forward path turn 41 and the backward path turn 42 by the portion 43, the forward path turn 41 and the backward path turn 42 which are adjacent in the order of the conductive direction. Are connected at the end on the same side in the circumferential direction C. In FIG. 9, four wavy turns 40 are shown arranged from the upper side to the lower side in the order along the conductive direction. The connecting portion 43 may be formed integrally with one or both of the forward path turn 41 and the backward path turn 42 or may be formed of a separate member. Here, “integrally formed” means that one continuous linear conductor is formed.

  As described above, in the present embodiment, the coil 30 is wound around the stator core 22 so that the number of slots 23 per phase per phase is “2”. Corresponding to this, as shown in FIG. 9, each of the first U-phase coil unit 31 u and the second U-phase coil unit 32 u includes two kinds of forward turns 41 and two kinds of return turns 42. The type referred to here is classification based on the combination of the slots 23 in which the slot accommodating portions 38 are arranged, and the arrangement position of the slot accommodating portions 38 in the slots 23 is not considered.

  In the example shown in FIG. 9, the two types of forward turns 41 provided in the first U-phase coil portion 31u are both spaced by 6 times the slot pitch (arrangement pitch in the circumferential direction C of the slot 23) of the slot accommodating portion 38. (That is, the same pitch as the magnetic pole pitch). These two types of forward turns 41 are arranged in a positional relationship shifted by one slot pitch in the circumferential direction C. Therefore, in the example shown in FIG. 9, the positional relationship in the circumferential direction C (the positional relationship in the circumferential direction C between the slot accommodating portions 38) in the in-phase slot group between the two types of forward turn 41 is the same in any in-phase slot group. Are the same. The positional relationship in the circumferential direction C in the in-phase slot group between the two types of forward turn 41 is opposite in the odd-numbered in-phase slot group and the even-numbered in-phase slot group toward one side in the circumferential direction C. The configuration may be a positional relationship. The two types of forward turns 41 provided in the second U-phase coil part 32u are also configured in the same manner as the two types of forward turns 41 provided in the first U-phase coil part 31u except that the arrangement positions in the circumferential direction C are different.

  In the example shown in FIG. 9, the two types of return turns 42 provided in the first U-phase coil portion 31 u are both configured such that the slot accommodating portions 38 are arranged at intervals of 6 times the slot pitch. . These two types of return turn 42 are arranged in a positional relationship shifted in the circumferential direction C by one slot pitch. That is, in the example shown in FIG. 9, the positional relationship in the circumferential direction C in the in-phase slot group between the two types of return path turns 42 is the same in any in-phase slot group. In addition, the positional relationship in the circumferential direction C in the in-phase slot group between the two types of return turn 42 is opposite to each other in the odd-numbered in-phase slot group and the even-numbered in-phase slot group toward one side in the circumferential direction C. The configuration may be a positional relationship. The two types of return turns 42 provided in the second U-phase coil portion 32u are also configured in the same manner as the two types of return turns 42 provided in the first U-phase coil portion 31u except that the arrangement positions in the circumferential direction C are different.

  As described above, in the stator 21 according to the present disclosure, the forward turn 41 and the backward turn 42 are arranged so as to be shifted from each other in the circumferential direction C in each of the first coil portion 31 and the second coil portion 32, and in the conductive direction. The forward turn 41 and the backward turn 42 that are adjacent in this order are connected by the connecting portion 43 at the end on the same side in the circumferential direction C. Thereby, the length of the connection part 43 can be suppressed short, and the enlargement of the coil end part 3 can be suppressed. Hereinafter, this point will be described with reference to comparative examples shown in FIGS.

  The comparative example shown in FIGS. 10 and 11 is not an example of the stator according to the present disclosure, but in order to facilitate comparison with the stator 21 according to the present disclosure, the same reference numerals as those in FIGS. 10 and FIG. As shown in FIG. 10, in this comparative example, unlike the stator 21 according to the present disclosure, the first region C1 in which the first coil portion 31 is disposed and the second region C2 in which the second coil portion 32 is disposed. Are set not to overlap each other. Note that the first region C1 shown in FIG. 10 is a region where the first U-phase coil unit 31u is arranged, and the second region C2 shown in FIG. 10 is a region where the second U-phase coil unit 32u is arranged. In FIG. 10, the illustration of the slot accommodating portion 38 is omitted, and only the outer edge of the region where the plurality of slot accommodating portions 38 are arranged in one slot 23 is shown in a simplified manner. In order to facilitate the distinction between the slot 23 in which the first coil portion 31 is disposed and the slot 23 in which the second coil portion 32 is disposed, an area in which the slot accommodating portion 38 of the first coil portion 31 is disposed. Has been hatched.

  In such a configuration of the comparative example, only the slot accommodating portion 38 of the first coil portion 31 is disposed in the slot 23 included in the first region C1, and the second portion C is included in the slot 23 included in the second region C2. Since only the slot accommodating portion 38 of the coil portion 32 is arranged, in order to wind the coil 30 around the stator core 22 in a wave shape so that the number of the slot accommodating portions 38 in each slot 23 is the same as each other, 11, the first coil unit using only the wave-like turns 40 (that is, only the forward turn 41 or only the backward turn 42 according to the present disclosure) that are directed to the same side in the circumferential direction C along the energization direction. 31 and the 2nd coil part 32 need to be comprised. Therefore, in such a comparative example, when the plurality of wave-like turns 40 included in the first coil part 31 and the plurality of wave-like turns 40 included in the second coil part 32 are to be connected to each other in series, FIG. Thus, it is necessary to connect the ends of the two corrugated turns 40 opposite to each other in the circumferential direction C, and the connecting portion 43 that connects the two corrugated turns 40 outside the slot 23 becomes long. Cheap.

  On the other hand, when the forward turn 41 and the backward turn 42 adjacent in the order of the conductive direction are connected at the end on the same side in the circumferential direction C as in the stator 21 according to the present disclosure, FIG. As can be seen from comparison with FIG. 10, the length of the connecting portion 43 (the length in the circumferential direction C) that connects the two wave-like turns 40 outside the slot 23 can be suppressed, and as a result, the coil An increase in size of the end portion 3 can be suppressed.

  By the way, when the 1st U-phase coil part 31u and the 2nd U-phase coil part 32u are comprised using the forward turn 41 and the return | turn path turn 42 which were mutually displaced in the circumferential direction C in this way, FIG.8 and FIG.9 shows. As shown in the figure, each of the first U-phase coil portion 31u and the second U-phase coil portion 32u has an intermediate area A1 in which both the forward turn 41 and the return turn 42 are disposed in one slot 23, and the intermediate area A1. On the other hand, an end region A2 that is formed on both sides in the circumferential direction C and in which only one of the forward path turn 41 and the backward path turn 42 is disposed in one slot 23 is formed. The intermediate region A1 of the first U-phase coil unit 31u is disposed in the intermediate part of the first region C1, and the end region A2 of the first U-phase coil unit 31u is a region where the first region C1 and the second region C2 overlap. Placed in. Similarly, the intermediate region A1 of the second U-phase coil portion 32u is disposed in the intermediate portion of the second region C2, and the end region A2 of the second U-phase coil portion 32u includes the first region C1 and the second region C2. Arranged in overlapping areas. In the present embodiment, there are a plurality of slots 23 per pole per phase. However, by using a plurality of types of forward turns 41 and a plurality of types of return turns 42, each slot 23 in the intermediate region A1 is used. Both the forward turn 41 and the return turn 42 are arranged.

  In view of the fact that the intermediate region A1 and the end region A2 are formed in each of the first U-phase coil portion 31u and the second U-phase coil portion 32u in this way, as shown in FIGS. The middle region A1 of the coil part 31u and the middle region A1 of the second U-phase coil part 32u are arranged in different slots 23, and the end region A2 of the first U-phase coil part 31u and the second U-phase coil part 32u The end region A <b> 2 is arranged in the same slot 23. Here, the slot 23 in which the end region A2 of the first U-phase coil unit 31u and the end region A2 of the second U-phase coil unit 32u are arranged is referred to as a mixed slot 23a. In the present embodiment, there are a plurality of Ns that are the number of slots 23 per phase per pole, and the end region A2 of the first U-phase coil unit 31u and the end region A2 of the second U-phase coil unit 32u Arranged inside each of N in-phase slots 23 (mixed slots 23 a) adjacent in the direction C. FIG. 8 shows two layers of the first U-phase coil part 31u and the second U-phase coil part 32u formed by the set of four wave-like turns 40 shown in FIG. By arranging three sets of the like turns 40 in total, the first U-phase coil part 31u and the second U-phase coil part 32u are arranged as shown in FIG. That is, in the present embodiment, each of the first U-phase coil unit 31u and the second U-phase coil unit 32u uses twelve undulating turns 40 (six forward turns 41 and six return turns 42). It is configured.

  By arranging the first U-phase coil part 31u and the second U-phase coil part 32u in this way, the wave provided in the first U-phase coil part 31u is placed in the slot 23 where the intermediate region A1 of the first U-phase coil part 31u is arranged. The same number of slot accommodating portions 38 as the value obtained by dividing the total number of the winding turns 40 by N (12/2 = 6 in this embodiment) is arranged, and the slot in which the intermediate region A1 of the second U-phase coil portion 32u is arranged. 23, the same number of slot accommodating portions 38 as the value obtained by dividing the total number of the wave-like turns 40 included in the second U-phase coil portion 32u by N (12/2 = 6 in the present embodiment) is disposed. That is, six slot accommodating portions 38 are disposed in both the slot 23 where the intermediate region A1 of the first U-phase coil portion 31u is disposed and the slot 23 where the intermediate region A1 of the second U-phase coil portion 32u is disposed. The

  On the other hand, for the mixed slot 23a in which the end region A2 of the first U-phase coil unit 31u and the end region A2 of the second U-phase coil unit 32u are arranged, the forward turn 41 and the second U-phase coil of the first U-phase coil unit 31u In the mixed slot 23a in which the return turn 42 of the part 32u is arranged, the same number as the value obtained by dividing the total number of forward turns 41 included in the first U-phase coil part 31u by N (6/2 = 3 in the present embodiment). A value obtained by dividing the total number of return turns 42 of the slot accommodating portion 38 (the slot accommodating portion 38 of the first U-phase coil portion 31u) and the second U-phase coil portion 32u by N (in this embodiment, 6/2 = 3). ) And the same number of slot accommodating portions 38 (slot accommodating portions 38 of the second U-phase coil portion 32u) are arranged. Further, in the mixed slot 23a in which the return turn 42 of the first U-phase coil unit 31u and the forward turn 41 of the second U-phase coil unit 32u are arranged, the total number of return turns 42 provided in the first U-phase coil unit 31u is N. The total number of slot accommodating portions 38 (slot accommodating portions 38 of the first U-phase coil portion 31u) equal to the value obtained by dividing (6/2 = 3 in the present embodiment) and the forward turn 41 included in the second U-phase coil portion 32u Are the same number of slot accommodating portions 38 (the slot accommodating portions 38 of the second U-phase coil portion 32u) as the value obtained by dividing N by 6 (6/2 = 3 in this embodiment). When the value obtained by dividing the total number of forward turns 41 by N or the value obtained by dividing the total number of return turns 42 by N is a band decimal, the value after the decimal point is rounded down or rounded up.

  Thus, a total of six slot accommodating portions 38 are arranged in the mixed slot 23a in which the end region A2 of the first U-phase coil unit 31u and the end region A2 of the second U-phase coil unit 32u are arranged. Is done. That is, in the mixed slot 23a, the same number of slot accommodating portions 38 as the intermediate region A1 are arranged, including the first U-phase coil portion 31u and the second U-phase coil portion 32u. As described above, the intermediate region A1 of the first U-phase coil unit 31u and the intermediate region A1 of the second U-phase coil unit 32u are arranged in different slots 23, and the end region A2 of the first U-phase coil unit 31u and By arranging the end region A2 of the second U-phase coil portion 32u in the same slot 23, the number of the slot accommodating portions 38 in each slot 23 is the same, and the coil 30 is appropriately wound around the stator core 22. It is possible. In the present embodiment, as shown in FIG. 7, the slot accommodating portion 38 of the first coil portion 31 and the slot accommodating portion 38 of the second coil portion 32 are arranged along the radial direction R in the mixed slot 23a. They are arranged alternately.

  Here, the case where six slot accommodating portions 38 are arranged inside each slot 23 by arranging the first coil portion 31 and the second coil portion 32 in the stator core 22 is shown as an example. The number of the slot accommodating portions 38 arranged inside 23 can be changed as appropriate, and can be an odd number instead of an even number. That is, when the number of the slot accommodating portions 38 arranged in each slot 23 is M (M is an integer equal to or larger than 2), the wave-like turns provided in the first coil portion 31 and the second coil portion 32. The total number of 40 may be M × N for each phase. When M × N is an even number, the first coil unit 31 and the second coil unit 32 have (M × N / 2) forward turns 41 and (M × N / 2) for each phase. Individual return turns 42. When M is an odd number, M × N can be an odd number, but when M × N is an odd number, the first coil portion 31 and the second coil portion 32 are each configured to have an outward turn 41 for each phase. And (M × N / 2 + 0.5) one of the return turns 42 and (M × N / 2−0.5) the other of the forward turns 41 and the return turns 42 are provided. That is, in this case, the number of the forward turns 41 and the number of the return turns 42 provided for each phase of the first coil portion 31 and the second coil portion 32 are not the same, and are different from each other by “1”. Become. When M is an odd number, the number of the slot accommodating portions 38 of the first coil portion 31 and the number of the slot accommodating portions 38 of the second coil portion 32 arranged in one mixed slot 23a is the same. Rather, the numbers differ from each other by “1”.

[Other Embodiments]
Next, other embodiments of the stator for the rotating electrical machine and the driving device will be described.

(1) In the above embodiment, the configuration in which the coil 30 includes the first coil portion 31 and the second coil portion 32 that are electrically insulated from each other has been described as an example. However, the present invention is not limited to such a configuration, and three or more coil portions (the first coil portion 31, the second coil portion 32, and other singular or plural coils) in which the coils 30 are electrically insulated from each other. The coil portion may be provided. In this case, the inverter 50 includes an inverter circuit corresponding to each of the three or more coil units, and the inverter 50 supplies AC power to each of the three or more coil units independently of each other. It can be. As described above, when the coil 30 includes three or more coil portions, the same number of regions in the circumferential direction C as the coil portions (the first region C1, the second region C2, and other single or plural regions). ) Are arranged side by side in the circumferential direction C, and each region is formed so as to partially overlap with other regions arranged on both sides in the circumferential direction C.

(2) In the above embodiment, the configuration in which the common control device 10 outputs the switching control signal to both the first drive circuit 11 and the second drive circuit 12 has been described as an example. However, the present invention is not limited to such a configuration, and a control device that outputs a switching control signal to the first drive circuit 11 and a control device that outputs a switching control signal to the second drive circuit 12 are provided. It can also be set as the structure provided separately.

(3) In the above embodiment, a configuration in which a plurality of coil parts included in the coil 30 (in the example of the above embodiment, the first coil part 31 and the second coil part 32) are electrically insulated from each other is taken as an example. explained. However, the present invention is not limited to such a configuration, and a configuration in which a plurality of coil portions included in the coil 30 are electrically connected to each other (for example, in parallel connection) may be employed. In this case, the inverter 50 can supply AC power to each of the plurality of coil units from a common inverter circuit.

(4) In the above embodiment, a configuration in which a plurality of phase coil portions constituting the first coil portion 31 are connected by star connection, and a plurality of phase coil portions constituting the second coil portion 32 are connected by star connection. Was described as an example. However, without being limited to such a configuration, the plurality of phase coil portions constituting the first coil portion 31 are connected by delta connection, and the plurality of phase coil portions constituting the second coil portion 32 are connected by delta connection. It can also be set as the structure connected.

(5) In the above embodiment, the configuration in which the rotating electrical machine 20 is an inner rotor type rotating electrical machine has been described as an example. However, the present invention is not limited to such a configuration, and the rotary electric machine 20 may be an outer rotor type rotary electric machine. Further, the rotary electric machine 20 may be configured to be an axial gap type rotary electric machine instead of a radial gap type. In this case, the transition portion 39 that connects the pair of slot accommodating portions 38 outside the slot 23 is disposed on one side or the other side in the radial direction R (extending direction of the slot 23) with respect to the stator core 22.

(6) In the above embodiment, the configuration in which the coil 30 is wound around the stator core 22 so that the number of the slots 23 per phase per phase is “2” has been described as an example. However, the present invention is not limited to such a configuration, and the coil 30 may be wound around the stator core 22 so that the number of slots 23 per phase per phase is “3” or more. However, it is also possible to adopt a configuration in which the stator core 22 is wound so that the number of slots 23 per phase per phase is “1”.

(7) It should be noted that the configuration disclosed in each of the above-described embodiments is applied in combination with the configuration disclosed in the other embodiment unless there is a contradiction (between the embodiments described as other embodiments. (Including combinations) is also possible. Regarding other configurations, the embodiments disclosed herein are merely examples in all respects. Accordingly, various modifications can be made as appropriate without departing from the spirit of the present disclosure.

[Overview of the above embodiment]
Hereinafter, the outline | summary of the stator for rotary electric machines demonstrated above and a drive device is demonstrated.

  A stator (21) for a rotating electrical machine comprising a stator core (22) having a plurality of slots (23) formed in the circumferential direction (C) and a coil (30) wound around the stator core (22). The coil (30) includes a slot accommodating portion (38) disposed in the slot (23) and a connecting portion (a connecting portion between the pair of slot accommodating portions (38) outside the slot (23)). 39), and the coil (30) is arranged in a first region (C1) which is a partial region in the circumferential direction (C), and the first region A second coil portion (32) disposed in a second region (C2) that is a region in the circumferential direction (C) that partially overlaps with (C1), and the first coil portion (31) and the second coil portion (31) Each of the second coil portions (32) has one circumferential direction (C). The crossover part (39) has a plurality of wave-like turns (40) alternately arranged on one side and the other side in the extending direction of the slot (23) toward the side, and the first coil part In each of (31) and said 2nd coil part (32), it is an outward turn (41) which is the said wave-like turn (40) which goes to the one side of the said circumferential direction (C) along the conduction direction of each coil part. ) And a return turn (42) which is the wave-like turn (40) heading toward the other side in the circumferential direction (C) are arranged so as to be shifted from each other in the circumferential direction (C) and the conductive direction The forward turn (41) and the return turn (42) which are adjacent in this order are connected at the end on the same side in the circumferential direction (C), and the first coil part (31) and the second coil part (32) one slot (23 An area in which both the forward turn (41) and the return turn (42) are arranged is an intermediate area (A1), and is formed on both sides in the circumferential direction (C) with respect to the intermediate area (A1). A region in which only one of the forward turn (41) and the return turn (42) is disposed in one slot (23) is defined as an end region (A2), and the first coil The intermediate region (A1) of the portion (31) and the intermediate region (A1) of the second coil portion (32) are disposed in different slots (23), and the first coil portion (31) An end region (A2) and the end region (A2) of the second coil portion (32) are disposed in the same slot (23), and the first coil is disposed in the slot (23). The part (31) and the second coil part (32) are combined. The same number of the slot accommodating portions (38) as the intermediate region (A1) are arranged.

According to said structure, a coil (30) is 1st coil part (31) arrange | positioned at 1st area | region (C1), and 2nd area | region (C2) partially overlapping with 1st area | region (C1). In the configuration including the second coil part (32) to be disposed, the forward turn (41) and the return turn adjacent to each other in the order of the conductive direction in each of the first coil part (31) and the second coil part (32). (42) is connected at the end on the same side in the circumferential direction (C). On the other hand, when the forward turns (41) or the backward turns (42) that are adjacent to each other in the order of the conductive direction are connected to each other, the opposite sides in the circumferential direction (C) in the two wave-like turns (40) It is necessary to connect the ends of each other, and the coil end portion tends to be large. However, as described above, the forward turn (41) and the return turn (42) that are adjacent in the order of the conductive direction are connected at the end on the same side in the circumferential direction (C). It is possible to reduce the length of the connecting portion that connects the two wave-like turns (40) adjacent in order outside the slot (23). Therefore, the enlargement of the coil end portion (3) can be suppressed.
The forward turn (41) and the return turn (42) that are adjacent to each other in the order of the conductive direction are arranged so as to be shifted from each other in the circumferential direction (C). ) In each slot (23), in addition to the intermediate region (A1) in which both the forward turn (41) and the return turn (42) are arranged in one slot (23). An end region (A2) in which only one of the turn (41) and the return turn (42) is arranged is formed. In this regard, according to the above configuration, the intermediate region (A1) of the first coil portion (31) and the intermediate region (A1) of the second coil portion (32) are arranged in different slots (23), The end region (A2) of the first coil part (31) and the end region (A2) of the second coil part (32) are arranged in the same slot (23), and the slot (23) The same number of slot accommodating portions (38) as the intermediate region (A1) are arranged by combining the first coil portion (31) and the second coil portion (32). That is, in the state where both the first coil portion (31) and the second coil portion (32) are wound around the stator core (22), the number of slot accommodating portions (38) in each slot (23) is the same. Therefore, the coil (30) including the first coil part (31) and the second coil part (32) is appropriately wound around the stator core (22) by effectively utilizing the space in the slot (23). be able to.
As mentioned above, according to said structure, when a coil (30) is provided with several coil parts (31, 32) from which the arrangement | positioning area | region of the circumferential direction (C) differs, enlargement of a coil end part (3) is carried out. Each coil part (31, 32) can be appropriately wound around the stator core (22) while suppressing the above.

  Here, assuming that the number of the slots (23) per phase per pole is N, the coil (30) is wound around the stator core (22) such that N is plural, and the first coil portion ( 31) The end region (A2) of the second coil portion (32) and the end region (A2) of the second coil portion (32) each of the N slots (23) adjacent in the circumferential direction (C). It is preferable that it is arranged inside.

  According to this configuration, the same number of slot accommodating portions (38) as the intermediate region (A1) can be arranged in each of the N slots (23) adjacent in the circumferential direction (C). Even when the number of slots (23) per phase is plural, each coil portion (31, 32) is appropriately wound around the stator core (22) while suppressing an increase in the size of the coil end portion (3). can do.

  A driving device (1) including a rotating electrical machine (20) including a rotating electrical machine stator (21) and an inverter (50) for driving the rotating electrical machine (20), wherein the first coil portion ( 31) and the second coil part (32) are electrically insulated from each other, and the inverter (50) supplies a first inverter circuit (51) for supplying AC power to the first coil part (31). ) And a second inverter circuit (52) for supplying AC power to the second coil section (32).

According to this configuration, the AC power supplied from the first inverter circuit (51) to the first coil unit (31) and the AC power supplied from the second inverter circuit (52) to the second coil unit (32) The rotary electric machine (20) can be driven by both. That is, the AC power supplied to the rotating electrical machine (20) can be shared by the first inverter circuit (51) and the second inverter circuit (52). As a result, the capacity required for each of the first inverter circuit (51) and the second inverter circuit (52) is kept small, and the capacity of the entire inverter is increased, that is, from the inverter (50) to the rotating electric machine. It becomes possible to improve the magnitude of the AC power that can be supplied to (20).
In the drive device (1) having such a configuration, when there is a switching timing shift between the first inverter circuit (51) and the second inverter circuit (52), the first coil unit (31) and The magnetic flux generated by the current flowing through one of the second coil parts (32) affects the other of the first coil part (31) and the second coil part (32), so that the first coil part (31) and There may be a difference in current amplitude between the second coil section (32). In this regard, the first region (C1) in which the first coil portion (31) is disposed and the second region (C2) in which the second coil portion (32) is disposed partially overlap each other. Since it is an area | region of a direction (C), compared with the case where a 1st coil part (31) and a 2nd coil part (32) are arrange | positioned in the same position of the circumferential direction (C), a 1st coil part (31 ) Between the magnetic circuit formed in the stator core (22) by the current flowing through the second coil portion (32) and the magnetic circuit formed in the stator core (22) through the current flowing through the second coil portion (32). Thereby, even if there is a deviation in switching timing between the first inverter circuit (51) and the second inverter circuit (52), the first coil part (31) and the second coil part (32) It is possible to appropriately drive the rotating electrical machine (20) while suppressing the difference in current amplitude between the two.

  The stator for a rotating electrical machine and the driving device according to the present disclosure only have to exhibit at least one of the effects described above.

1: Drive device 20: rotating electric machine 21: stator (stator for rotating electric machine)
22: Stator core 23: Slot 30: Coil 31: First coil part 32: Second coil part 38: Slot accommodating part 39: Crossing part 40: Corrugated turn 41: Outward turn 42: Inward turn 50: Inverter 51: First 1 inverter circuit 52: second inverter circuit A1: intermediate region A2: end region C: circumferential direction C1: first region C2: second region L: axial direction (extending direction)

Claims (3)

A stator for a rotating electrical machine comprising a stator core in which a plurality of slots are formed in the circumferential direction, and a coil wound around the stator core,
The coil includes a slot accommodating portion disposed in the slot, and a crossing portion that connects the pair of slot accommodating portions outside the slot,
The coil is disposed in a first coil portion disposed in a first region that is a partial region in the circumferential direction, and in a second region that is a region in the circumferential direction that partially overlaps the first region. A second coil part,
Each of the first coil portion and the second coil portion has a corrugated shape in which the crossing portions are alternately arranged on one side and the other side in the extending direction of the slot toward one side in the circumferential direction. Have multiple turns,
In each of the first coil portion and the second coil portion, an outward turn that is the wave-like turn toward the one side in the circumferential direction along the conductive direction of each coil portion, and the other side in the circumferential direction The return turn, which is the undulating turn toward, is arranged so as to be shifted from each other in the circumferential direction, and the forward turn and the return turn that are adjacent in the order of the conductive direction are on the same end in the circumferential direction. Connected by
In each of the first coil portion and the second coil portion, an area where both the forward turn and the backward turn are disposed in one slot is an intermediate area, and the circumferential direction with respect to the intermediate area An area formed on both sides of the first slot and only one of the forward turn and the backward turn is disposed in one of the slots as an end region,
The intermediate region of the first coil part and the intermediate region of the second coil part are arranged in different slots, and the end region of the first coil part and the end region of the second coil part For the rotating electrical machine in which the same number of the slot accommodating portions as the intermediate region are arranged in the slot together with the first coil portion and the second coil portion. Stator. The number of slots per phase per phase is N, and the coil is wound around the stator core such that N is plural,
2. The device according to claim 1, wherein the end region of the first coil part and the end region of the second coil part are disposed inside each of the N slots adjacent in the circumferential direction. Stator for rotating electrical machines. A drive device comprising: a rotating electrical machine comprising the rotating electrical machine stator according to claim 1; and an inverter that drives the rotating electrical machine,
The first coil part and the second coil part are electrically insulated from each other,
A drive device, wherein the inverter includes a first inverter circuit that supplies AC power to the first coil unit, and a second inverter circuit that supplies AC power to the second coil unit.

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