WO2024218882A1 - 回転電機装置および電動パワーステアリング装置 - Google Patents
回転電機装置および電動パワーステアリング装置 Download PDFInfo
- Publication number
- WO2024218882A1 WO2024218882A1 PCT/JP2023/015556 JP2023015556W WO2024218882A1 WO 2024218882 A1 WO2024218882 A1 WO 2024218882A1 JP 2023015556 W JP2023015556 W JP 2023015556W WO 2024218882 A1 WO2024218882 A1 WO 2024218882A1
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- WIPO (PCT)
- Prior art keywords
- electric machine
- control board
- rotating electric
- bus bar
- screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/01—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for shielding from electromagnetic fields, i.e. structural association with shields
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0403—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box
- B62D5/0406—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box including housing for electronic control unit
Definitions
- This disclosure relates to a rotating electric machine device and an electric power steering device.
- rotating electric machine devices in which a rotating electric machine and a control unit are integrated are known.
- the rotating electric machine and the control unit are arranged side by side in the axial direction along the axis of the rotating shaft of the rotating electric machine.
- the control unit has a power module that supplies current to the windings of the rotating electric machine, and a control board on which a control circuit section that controls the power module is mounted.
- the rotating electric machine device of Patent Document 1 adopts a so-called vertical arrangement method in which the power module and the control board are arranged along the axial direction.
- the rotating electric machine device of Patent Document 2 adopts a so-called horizontal arrangement method in which the power module and the control board are arranged perpendicular to the axial direction.
- the present disclosure aims to provide a rotating electric machine device and an electric power steering device that can suppress the propagation of noise generated in the control unit to the outside of the rotating electric machine device while suppressing an increase in the size of the rotating electric machine device.
- One aspect of the rotating electric machine device includes a rotating electric machine having a rotating shaft, a control unit arranged alongside the rotating electric machine in an axial direction along the axis of the rotating shaft and controlling the rotating electric machine, and an electromagnetic shield covering the control unit, the control unit having a control board extending in the axial direction and connected to an external connection terminal, and a filter section that attenuates noise components propagating to the external connection terminal, the electromagnetic shield covering the entire control board and formed in a cylindrical shape having a first apex having a through hole through which the external connection terminal is inserted and a second apex arranged closer to the rotating electric machine than the first apex, and at least a portion of the filter section is mounted on the control board and arranged between the first apex and the second apex in the axial direction.
- One embodiment of the electric power steering device according to the present disclosure includes the rotating electric machine device.
- the present disclosure provides a rotating electric device and an electric power steering device that can suppress the propagation of noise generated in the control unit to the outside of the rotating electric device while minimizing an increase in the size of the rotating electric device.
- FIG. 1 is a circuit diagram of a rotating electric machine device according to a first embodiment; 1 is a cross-sectional view showing a configuration of a rotating electric machine device according to a first embodiment;
- FIG. 2 is a plan view of the electromagnetic shield according to the first embodiment.
- 1 is a plan view of a rotating electric machine device according to a first embodiment, showing a state in which a housing and an electromagnetic shield have been removed;
- 1 is a partial cross-sectional view of a rotating electric machine device according to a first embodiment;
- 3 is a diagram showing the control board according to the first embodiment as viewed from a first orthogonal direction.
- FIG. FIG. 13 is a plan view of an electromagnetic shield according to a modified example of the first embodiment.
- FIG. 11 is a partial cross-sectional view of a rotating electric machine device according to a second embodiment.
- FIG. 11 is a partial cross-sectional view of a rotating electric machine device according to a third embodiment.
- 13 is a diagram showing a control board according to a fourth embodiment as viewed from a first orthogonal direction.
- FIG. 13 is a partial cross-sectional view of a rotating electric machine device according to a fifth embodiment.
- FIG. 13 is a partial cross-sectional view of a rotating electric machine device according to a sixth embodiment.
- FIG. 13 is a partial cross-sectional view of a rotating electric machine device according to a seventh embodiment.
- FIG. 13 is a circuit diagram of a rotating electric machine device according to an eighth embodiment.
- FIG. 13 is a cross-sectional view showing the configuration of a rotating electric machine device according to an eighth embodiment of the present invention.
- 13 is a diagram showing a control board according to an eighth embodiment as viewed from a first orthogonal direction.
- FIG. 13 is a diagram showing a control board according to a modified example of embodiment 8, as viewed from a first orthogonal direction.
- FIG. 13 is a schematic configuration diagram of an electric power steering device according to a ninth embodiment.
- Fig. 1 is a circuit diagram of a rotating electrical machine device 100 according to the first embodiment.
- Fig. 2 is a cross-sectional view of the rotating electrical machine device 100. 1 and 2, the rotating electric machine device 100 has a control unit 1 and a rotating electric machine 2. The control unit 1 and the rotating electric machine 2 are integrated.
- the rotating electric machine device 100 is used, for example, in an electric power steering device mounted on a vehicle.
- the rotating electric machine device 100 may have a function of generating power by driving a load and utilizing the regenerative power to charge a battery.
- the control unit 1 includes an inverter circuit 3, a control circuit section 4, a switching element 5 for a power relay, a filter section 17, etc.
- a battery 6 (power source), an ignition switch 7, and sensors 8 are connected to the control unit 1.
- the sensors 8 include, for example, a steering angle sensor that is provided near the steering wheel of the vehicle and detects the steering angle, a torque sensor that detects the steering torque, a speed sensor that detects the traveling speed of the vehicle, etc.
- the rotating electric machine 2 is, for example, a three-phase brushless rotating electric machine.
- the three phases are U-phase, V-phase, and W-phase.
- the rotating electric machine 2 has three-phase windings.
- the three-phase windings are represented by the symbols Ua, Va, and Wa.
- the three-phase windings Ua, Va, and Wa are delta-connected.
- the three-phase windings Ua, Va, and Wa may also be Y-connected.
- the rotating electric machine 2 may also be a two-pole, two-pair brushed rotating electric machine.
- the rotating electric machine 2 is provided with a rotation sensor 9 for detecting the rotation angle of the rotating shaft 21 (see FIG. 2) of the rotating electric machine 2.
- the inverter circuit 3 includes smoothing capacitors 30U, 30V, 30W, upper arm switching elements 31U, 31V, 31W, lower arm switching elements 32U, 32V, 32W, shunt resistors 33U, 33V, 33W, and rotating machine relay switching elements 34U, 34V, 34W, which are provided corresponding to the three-phase windings Ua, Va, Wa, respectively.
- the circuit configurations corresponding to the U-phase, V-phase, and W-phase are the same. Therefore, the following description will be given of the U-phase as a representative of these three phases. In other words, the following description also applies to the V-phase and W-phase.
- the upper arm switching element 31U is electrically connected to the positive electrode of the battery 6, and the lower arm switching element 32U is electrically connected to the negative electrode of the battery 6.
- the upper arm switching element 31U and the lower arm switching element 32U are connected in series.
- the rotating electric machine relay switching element 34U is connected between the upper arm switching element 31U and the lower arm switching element 32U.
- the rotating electric machine relay switching element 34U switches on and off the power supply from the portion between the upper arm switching element 31U and the lower arm switching element 32U to the winding Ua of the rotating electric machine 2.
- the smoothing capacitor 30U has a function of suppressing power supply voltage fluctuations and noise during switching.
- the shunt resistor 33U is connected between the lower arm switching element 32U and ground. The shunt resistor 33U is used to detect the current flowing through the winding Ua of the rotating electric machine 2.
- the control circuit section 4 controls the inverter circuit 3.
- the control circuit section 4 includes a CPU (Central Processing Unit) 10, a drive circuit 11, an input circuit 12, a power supply circuit 13, etc.
- CPU Central Processing Unit
- the ignition signal from the ignition switch 7 supplies power from the battery 6 to the power supply circuit 13.
- the power supply circuit 13 uses the power supplied from the battery 6 to generate a power supply voltage for the normal operation of each electronic component that constitutes the control unit 1.
- the power from the battery 6 is also supplied to the inverter circuit 3 via the filter section 17 and the power relay switching element 5.
- Sensors 8 are connected to the input circuit 12. Information from the sensors 8 is transmitted to the CPU 10 via the input circuit 12. Based on this information, the CPU 10 calculates and outputs a control amount corresponding to the magnitude of the current supplied to each of the three-phase windings Ua, Va, and Wa of the rotating electric machine 2. The output signal of the CPU 10 is transmitted to the drive circuit 11. The drive circuit 11 drives the inverter circuit 3 based on the calculation result of the CPU 10. Control by the drive circuit 11 is performed for each of the three phases (U phase, V phase, and W phase) of the rotating electric machine 2, and current is supplied independently from the inverter circuit 3 to each of the three-phase windings Ua, Va, and Wa.
- the detection results from the rotation sensor 9 are fed back to the input circuit 12.
- the CPU 10 uses the rotation angle information obtained by the rotation sensor 9 to calculate the rotation angle of the rotating shaft 21 of the rotating electric machine 2, etc.
- the potential difference between both ends of the shunt resistors 33U, 33V, 33W and the voltages at the terminals of the three-phase windings Ua, Va, Wa of the rotating electric machine 2 are also fed back to the input circuit 12. Based on this information, the CPU 10 calculates the difference between the calculated and detected current values and performs feedback control.
- the power relay switching element 5 is provided between the battery 6 and the inverter circuit 3.
- the power relay switching element 5 switches between supplying and cutting off current from the battery 6 to the inverter circuit 3 based on a drive signal from the drive circuit 11.
- the power relay switching element 5 can cut off the supply of current to the rotating electric machine 2.
- the CPU 10 has an abnormality detection function that detects abnormalities in the sensors 8, the drive circuit 11, the inverter circuit 3, the three-phase windings Ua, Va, Wa, etc. of the rotating electric machine 2.
- the CPU 10 turns off the upper arm switching elements 31U, 31V, 31W, the lower arm switching elements 32U, 32V, 32W, or the rotating electric machine relay switching elements 34U, 34V, 34W of the corresponding phase in order to cut off the supply of current to the phase in which the abnormality was detected.
- the CPU 10 may turn off the power supply relay switching element 5 to cut off the supply of current to all phases.
- the filter unit 17 suppresses noise generated in the inverter circuit 3. Specifically, switching noise is generated by the PWM (Pulse Width Modulation) control of the inverter circuit 3.
- the filter unit 17 is provided to suppress this switching noise from being transmitted from the rotating electrical machine 100 to the outside.
- the filter unit 17 is connected to a power supply line and a GND (Ground) line from the battery 6.
- the filter section 17 includes a normal mode coil 17a (coil) and capacitors 17b, 17c, and 17d.
- the normal mode coil 17a is a coil for normal mode noise.
- the capacitor 17b is an across-the-line capacitor or an X capacitor.
- the capacitors 17c and 17d are line bypass capacitors or Y capacitors.
- the filter section 17 is an EMI (Electromagnetic Interface) filter that suppresses conductive noise and radiated noise generated in the inverter circuit 3.
- a midpoint 17e between the capacitors 17c and 17d is a body ground, and is electrically connected to the vehicle body via a part of the rotating electric machine 100 and is grounded.
- the filter section 17 may include a common mode coil which is a coil for common mode noise, the normal mode coil 17a may be omitted, and the number of capacitors included in the filter section 17 may be two or less, or four or more.
- the direction along the axis O of the rotating shaft 21 of the rotating electric machine 2 is referred to as the axial direction Z.
- the rotating electric machine 2 and the control unit 1 are arranged side by side in the axial direction Z and integrated.
- the side where the control unit 1 is arranged is referred to as the upper side
- the side where the rotating electric machine 2 is arranged is referred to as the lower side.
- Viewing from the axial direction Z is referred to as a plan view.
- a view seen from the axial direction Z is referred to as a plan view. Note that the axial direction Z does not have to coincide with the vertical direction.
- a direction perpendicular to the axial direction Z is referred to as the first orthogonal direction X.
- a direction perpendicular to both the axial direction Z and the first orthogonal direction X is referred to as the second orthogonal direction Y.
- the side away from the axis O of the rotating shaft 21 is referred to as the outside of the first orthogonal direction X, and the side toward the axis O of the rotating shaft 21 is referred to as the inside of the first orthogonal direction X.
- the side away from the axis O of the rotating shaft 21 is referred to as the outer side of the second orthogonal direction Y, and the side toward the axis O of the rotating shaft 21 is referred to as the inner side of the second orthogonal direction Y.
- the rotating electric machine 2 has a rotor and a stator (not shown).
- the rotor and the stator are housed in a rotating electric machine case 25.
- the rotor is fixed to the rotating shaft 21.
- a plurality of permanent magnets are arranged on the outer peripheral surface of the rotor.
- the plurality of permanent magnets are arranged, for example, so that the polarities (south poles and north poles) on the outer peripheral surface of the rotor alternate along the circumferential direction.
- the stator is arranged on the outer peripheral side of the rotor with a gap therebetween.
- Three-phase windings Ua, Va, Wa are wound around the stator.
- the three-phase windings Ua, Va, Wa are distributed or concentratedly wound around the stator.
- the ends (not shown) of the three-phase windings Ua, Va, Wa extend toward the control unit 1.
- the control unit 1 has a control board 14, a power module 35, and a busbar unit 36.
- the control unit 1 is covered by a housing 40.
- the housing 40 covers the top and outer periphery of the control unit 1.
- the components that make up the control unit 1 are housed in the housing 40, which helps prevent damage to these components.
- a power connector 42 and a signal connector 43 are located on the top of the housing 40.
- the power connector 42 has a first holding member 421 and a power connection terminal 422 (external connection terminal) extending downward from the first holding member 421.
- the signal connector 43 has a second holding member 431 and a signal connection terminal 432 extending downward from the second holding member 431.
- the first holding member 421, the second holding member 431, and the housing 40 are integrally molded from a resin material.
- the power connection terminal 422 and the signal connection terminal 432 are housed in the housing 40.
- the power connection terminal 422 and the signal connection terminal 432 are inserted into through holes (not shown) formed in the control board 14 and are electrically connected to a circuit pattern formed on the control board 14. A relatively large current of the power supply system flows through the power connector 42, and a relatively small current of the signal system flows through the signal connector 43.
- An electromagnetic shield 37 having a cylindrical shape with a top is provided inside the housing 40.
- the electromagnetic shield 37 covers the control board 14, the power module 35, and the bus bar unit 36.
- the electromagnetic shield 37 is made of metal. The electromagnetic shield 37 prevents noise generated in the control unit 1 from being emitted to the outside.
- the electromagnetic shield 37 has a stepped shape. Specifically, the electromagnetic shield 37 has a first top 37a, a second top 37b located below the first top 37a, and a connection portion 37c that connects the first top 37a and the second top 37b.
- FIG. 3 is a top view of the electromagnetic shield 37.
- the first top 37a is provided with a through hole 371.
- the power connection terminal 422 of the power connector 42 and the signal connection terminal 432 of the signal connector 43 are inserted into the through hole 371.
- the second top 37b is provided with a through hole 372 through which the second screw 60a (see FIG. 5) is inserted.
- the electromagnetic shield 37 may be formed with a through hole for positioning during assembly, etc.
- a heat sink 34 is disposed inside the housing 40.
- the heat sink 34 has a cylindrical base 342 and a pillar portion 341 that protrudes upward from the center of the base 342.
- the pillar portion 341 is disposed inside the electromagnetic shield 37.
- the pillar portion 341 extends in the axial direction Z.
- the end of the pillar portion 341 in the axial direction Z is fixed to the base portion 342.
- the pillar portion 341 is cantilever-supported by the base portion 342.
- FIG. 4 is a plan view of the rotating electrical machine 100 with the housing 40 and electromagnetic shield 37 removed.
- the pillar portion 341 has a rectangular shape that is long in the second orthogonal direction Y.
- a power module 35 is arranged on a side surface of the pillar portion 341 in the second orthogonal direction Y.
- a control board 14 is arranged on one side surface of the pillar portion 341 in the first orthogonal direction X.
- a screw fastening base 343 for fixing the control board 14 to the heat sink 34 is provided on one side surface of the pillar portion 341 in the first orthogonal direction X.
- a busbar unit 36 is arranged on the other side surface of the pillar portion 341 in the first orthogonal direction X.
- the base 342 has a large diameter portion 342a and a small diameter portion 342b that is located above the large diameter portion 342a and has a smaller diameter than the large diameter portion 342a.
- the rotating electric machine case 25 and the housing 40 are fixed to the outer peripheral surface of the large diameter portion 342a.
- the base 342 is supported by the rotating electric machine case 25.
- the electromagnetic shield 37 is fixed to the outer peripheral surface of the small diameter portion 342b.
- the base 342 has insertion holes (not shown) through which the ends of the three-phase windings Ua, Va, and Wa are inserted. Although not shown, the ends of the three-phase windings Ua, Va, and Wa extend upward through the insertion holes and are connected to the busbar unit 36.
- the power module 35 is arranged vertically along the side surface of the pillar portion 341 in the second orthogonal direction Y.
- the power module 35 is provided on the back side of the pillar portion 341 and is indicated by a two-dot chain line.
- the power module 35 includes upper arm switching elements 31U, 31V, 31W of the inverter circuit 3, lower arm switching elements 32U, 32V, 32W, shunt resistors 33U, 33V, 33W, and rotating electric machine relay switching elements 34U, 34V, 34W.
- a first terminal 351 connected to the control board 14 is provided at one end of the power module 35 in the first orthogonal direction X, and a second terminal 352 connected to the busbar unit 36 is provided at the other end.
- the control board 14 and the first terminal 351 are connected by soldering
- the bus bar unit 36 and the second terminal 352 are connected by TIG (Tungsten Insert Gas) welding.
- the busbar unit 36 has a busbar base 361.
- the busbar base 361 has a busbar 362 and a resin busbar holder 363 in which the busbar 362 is embedded.
- the smoothing capacitors 30U, 30V, 30W of the inverter circuit 3 and the normal mode coil 17a of the filter section 17 are mounted on the busbar base 361.
- the busbar 362 is connected to the ends of the three-phase windings Ua, Va, Wa of the rotating electric machine 2, the second terminal 352 of the power module 35, the terminals of the smoothing capacitors 30U, 30V, 30W, the terminals of the normal mode coil 17a, and the power supply connection terminals 422 (power supply terminal and GND terminal) of the power supply connector 42.
- the control board 14 is disposed vertically along one side surface of the column portion 341 in the first orthogonal direction X. That is, the control board 14 is disposed so as to extend in the axial direction Z and the second orthogonal direction Y.
- the control board 14 has a first surface 14a facing inward in the first orthogonal direction X, and a second surface 14b facing outward in the first orthogonal direction X.
- the control circuit section 4, the power relay switching element 5, and the capacitors 17b, 17c, and 17d of the filter section 17 are mounted on the control board 14. Note that the control circuit section 4 and the power relay switching element 5 are not shown in FIG. 2.
- the control board 14 also has circuit components (not shown) used to control the inverter circuit 3.
- the drive circuit 11 is mounted on the control board 14. However, the drive circuit 11 may also be disposed in the power module 35. Also, because the current flowing through the power relay switching element 5 is relatively large, the power relay switching element 5 may also be disposed in the power module 35 instead of the control board 14.
- FIG. 5 is a partial cross-sectional view showing the periphery of the upper part 141 of the control board 14 of the rotating electric machine 100.
- the capacitors 17b, 17c, and 17d are arranged on the upper part 141 of the control board 14.
- the capacitors 17b, 17c, and 17d are arranged between the first apex 37a and the second apex 37b in the axial direction Z.
- the entire capacitors 17b, 17c, and 17d are arranged above the second apex 37b (on the first apex 37a side).
- a power supply connection terminal 422 and a signal connection terminal 432 are connected to the upper part 141.
- the filter section 17 prevents noise generated in the inverter circuit 3 from leaking to the outside through the power supply connection terminal 422.
- the capacitors 17b, 17c, and 17d are arranged on the second surface 14b of the control board 14. Capacitors 17b, 17c, and 17d may be disposed on the first surface 14a of the control board 14.
- the control board 14 has a through hole 143 through which the first screw 60b is inserted.
- a GND pattern 142 is formed on the outer periphery of the through hole 143 on the second surface 14b of the control board 14.
- the GND pattern 142 constitutes part of a wiring pattern that is electrically connected to the capacitors 17b, 17c, and 17d and the power supply connection terminal 422.
- the GND pattern 142 constitutes the filter section 17 together with the capacitors 17b, 17c, and 17d. Because the filter section 17 is constituted by the GND pattern 142, it is possible to improve the reliability of the connection with the power supply connection terminal 422 while keeping costs down.
- a ground bus bar 38 is provided between the control board 14 and the electromagnetic shield 37.
- the ground bus bar 38 electrically connects the GND pattern 142 and the electromagnetic shield 37.
- the ground bus bar 38 is formed in an L-shape having a first plate portion 38a and a second plate portion 38b.
- the second plate portion 38b contacts the lower surface of the second apex 37b.
- a through hole 382 through which the second screw 60a is inserted is formed in the second plate portion 38b.
- a fastening portion 39 into which the second screw 60a is fastened is provided on the lower surface of the second plate portion 38b.
- the fastening portion 39 is provided so as to sandwich the second plate portion 38b between itself and the second apex 37b.
- the fastening portion 39 is, for example, a hexagonal nut.
- a resin holder 61 (resin member) is provided on the lower surface of the second plate portion 38b.
- the second plate portion 38b is supported from below by the resin holder 61.
- the resin holder 61 is assembled to the ground bus bar 38 by press-fitting or the like.
- the resin holder 61 holds the fastening portion 39 so that it cannot rotate.
- the second apex 37b, the second plate portion 38b, and the fastened portion 39 are arranged in this order from above.
- the second screw 60a is inserted from above through the through hole 372 and the through hole 382 and fastened to the fastened portion 39.
- the second plate portion 38b and the second apex 37b are fixed to each other in a state of close contact, and the second plate portion 38b and the second apex 37b are electrically connected.
- the axis of the second screw 60a is arranged perpendicular to the second apex 37b.
- the electromagnetic shield 37 and the ground bus bar 38 can be fixed to each other without providing a fixing part above the second screw 60a. Therefore, there is no need to ensure a distance in the axial direction Z between the electromagnetic shield 37 and the housing 40 for fixing the ground bus bar 38, and an increase in the size of the control unit 1 in the axial direction Z can be suppressed.
- the second apex 37b may have a cutout hole 373 that surrounds the through hole 372.
- the cutout hole 373 By providing the cutout hole 373, the second apex 37b becomes easier to deform, and the second plate portion 38b and the second apex 37b can be fixed more reliably.
- the first plate portion 38a contacts the second surface 14b of the control board 14.
- the first plate portion 38a contacts the GND pattern 142 of the control board 14.
- the first plate portion 38a has a through hole 381 through which the first screw 60b is inserted.
- the resin holder 61 has a protruding portion 61a that protrudes downward.
- the second plate portion 38b is covered from the outside in the first orthogonal direction X by the protruding portion 61a.
- the protruding portion 61a has a through hole 611 through which the first screw 60b is inserted.
- the outer periphery of the through hole 143 on the first surface 14a of the control board 14 is supported by the screw-tightening base 343 of the heat sink 34.
- the protrusion 61a, the first plate portion 38a, the control board 14, and the screw fastening base 343 are arranged in this order toward the inside of the first orthogonal direction X.
- the first screw 60b is inserted from the outside of the first orthogonal direction X through the through hole 611, the through hole 381, and the through hole 143 to be fastened to the screw fastening base 343.
- the first plate portion 38a and the control board 14 are fixed to the screw fastening base 343 with the first plate portion 38a and the control board 14 in close contact with each other, and the first plate portion 38a and the GND pattern 142 are electrically connected.
- the axis of the first screw 60b is arranged perpendicular to the control board 14. Since the first plate portion 38a is disposed outside the control board 14 in the first orthogonal direction X and the first screw 60b is fastened from the outside in the first orthogonal direction X, it is possible to fix the grounding bus bar 38 and the control board 14 to the heat sink 34 without providing a fixing part above the heat sink 34, for example. Therefore, an increase in the size of the control unit 1 in the axial direction Z can be suppressed.
- the GND pattern 142 and the electromagnetic shield 37 are electrically connected via the ground bus bar 38. Furthermore, the first screw 60b is electrically connected to the heat sink 34 by fastening the first screw 60b to the screw fastening base 343. However, the electromagnetic shield 37 and the GND pattern 142 are not electrically connected to the first screw 60b and the heat sink 34. That is, the protruding portion 61a of the resin holder 61 as an insulating material is sandwiched between the head of the first screw 60b and the first plate portion 38a. Furthermore, the shaft portion of the first screw 60b is not in contact with the inner surface of the through hole 381 of the first plate portion 38a and the inner surface of the through hole 143 of the control board 14.
- a resin collar as an insulating material may be arranged on the inner surface of the through hole 381 of the first plate portion 38a and the inner surface of the through hole 143 of the control board 14.
- the first screw 60b is electrically insulated from the ground bus bar 38 and the control board 14.
- the first surface 14a of the control board 14 is electrically insulated from the screw fastening base 343. Therefore, the capacitors 17b, 17c, and 17d of the filter unit 17 are grounded via the ground bus bar 38 and the electromagnetic shield 37, without passing through the heat sink 34 to which the power module 35, which is a noise source, is attached. This allows the filter unit 17 to effectively suppress noise generated in the power module 35 (inverter circuit 3).
- FIG. 6 is a view of the control board 14 as seen from the first orthogonal direction X.
- the first apex 37a and the second apex 37b of the electromagnetic shield 37 are indicated by two-dot chain lines.
- the second screw 60a is indicated by a dotted line.
- the ground bus bar 38 when viewed from the first orthogonal direction X, the ground bus bar 38 is disposed at a position overlapping with the center of the control board 14 in the second orthogonal direction Y.
- the screws 60a, 60b are also disposed at a position overlapping with the center of the control board 14 in the second orthogonal direction Y.
- the screws 60a, 60b are disposed so that the axis of the second screw 60a, the axis of the first screw 60b, and the axis O of the rotating shaft 21 are located on the same plane. This allows the control board 14 to be fixed to the electromagnetic shield 37 at the center in the second orthogonal direction Y using the screws 60a, 60b, improving the vibration resistance and durability of the control board 14.
- the rotating electric machine device 100 includes a rotating electric machine 2 having a rotating shaft 21, a control unit 1 arranged alongside the rotating electric machine 2 in the axial direction Z and controlling the rotating electric machine 2, and an electromagnetic shield 37 covering the control unit 1.
- the control unit 1 extends in the axial direction Z and includes a control board 14 to which the power supply connection terminal 422 of the power supply connector 42 is connected, and a filter section 17 that attenuates noise components propagating to the power supply connection terminal 422.
- the electromagnetic shield 37 covers the entire control board 14 and is formed in a cylindrical shape having a first top 37a having a through hole 371 through which the power supply connection terminal 422 is inserted, and a second top 37b arranged closer to the rotating electric machine 2 than the first top 37a.
- the capacitors 17b, 17c, and 17d of the filter section 17 are mounted on the control board 14 and are disposed between the first apex 37a and the second apex 37b in the axial direction Z.
- the capacitors 17b, 17c, and 17d are mounted on the control board 14, an increase in size of the rotating electric machine device 100 can be suppressed and the cost of the rotating electric machine device 100 can be reduced compared to a case where a dedicated board and support structure are provided for mounting the capacitors 17b, 17c, and 17d. Furthermore, since the capacitors 17b, 17c, and 17d are disposed between the first top 37a and the second top 37b in the axial direction Z, the capacitors 17b, 17c, and 17d can be disposed close to the power supply connection terminal 422, and the noise components propagating to the power supply connection terminal 422 by the filter unit 17 can be effectively attenuated.
- the entire control board 14 is covered with the electromagnetic shield 37, and the first top 37a of the electromagnetic shield 37 has a through hole 371 through which the power supply connection terminal 422 is inserted.
- the electromagnetic shield 37 has a stepped shape having a first top 37 a and a second top 37 b.
- the filter section 17 has a GND pattern 142 that is formed on the control board 14 and is electrically connected to the power supply connection terminal 422.
- the control unit 1 has a ground bus bar 38 that electrically connects the GND pattern 142 and the electromagnetic shield 37. This allows the filter section 17 to be grounded via the ground bus bar 38 and the electromagnetic shield 37 .
- the rotating electric machine 100 further includes a heat sink 34 disposed inside the electromagnetic shield 37.
- the control unit 1 has a first screw 60b that fixes the ground bus bar 38 and the control board 14 to the heat sink 34, and a resin holder 61 disposed between the ground bus bar 38 and the first screw 60b.
- the first screw 60b can fix the ground bus bar 38 and the control board 14 to the heat sink 34.
- a resin holder 61 is disposed between the ground bus bar 38 and the first screw 60b, and the ground bus bar 38 and the first screw 60b are insulated from each other. Therefore, the filter unit 17 can be grounded via the ground bus bar 38 and the electromagnetic shield 37, without passing through the heat sink 34 to which the power module 35, which is a noise source, is attached. This allows the filter unit 17 to more effectively attenuate noise components propagating to the power supply connection terminal 422.
- the resin holder 61 , the ground bus bar 38 , the control board 14 , and the heat sink 34 are arranged in this order toward the axis O of the rotating shaft 21 . This makes it possible to easily fix the ground bus bar 38 and the control board 14 to the heat sink 34 using the first screws 60b.
- the control unit 1 also has a second screw 60a that fixes the ground bus bar 38 to the second top portion 37b.
- a second screw 60a can secure the ground bus bar 38 to the second top portion 37b.
- the control unit 1 also has a fastening portion 39 that is provided to sandwich the ground bus bar 38 between itself and the second top portion 37b and into which the second screw 60a is fastened. This allows the ground bus bar 38 to be more reliably fixed to the second top portion 37b.
- ground bus bar 38 and the second top portion 37b are arranged side by side in the axial direction Z. This allows the second screw 60a to be fastened from above in the axial direction Z, making it easier to fix the ground bus bar 38 to the second top portion 37b.
- the control unit 1 also has a ground bus bar 38, a first screw 60b for attaching the ground bus bar 38 to the control board 14, and a second screw 60a for attaching the ground bus bar 38 to the second top portion 37b.
- the axis of the first screw 60b and the axis of the second screw 60a are disposed on the same plane including the axis O of the rotating shaft 21. This allows the control board 14 to be securely fixed to the electromagnetic shield 37 using the screws 60a, 60b, improving the vibration resistance and durability of the control board 14.
- the axis of the first screw 60b is disposed perpendicular to the control board 14, and the axis of the second screw 60a is disposed perpendicular to the second apex 37b. This allows the ground bus bar 38 and the control board 14 to be reliably fixed without loosening by using the first screws 60b, and the ground bus bar 38 and the electromagnetic shield 37 to be reliably fixed without loosening by using the second screws 60a, thereby improving the vibration resistance and durability of the control board 14.
- the rotating electrical machine 100 further includes a housing 40 that accommodates the power supply connection terminal 422 and covers the electromagnetic shield 37 . Since the components constituting the control unit 1 are housed in the housing 40, damage to these components can be prevented. In addition, by arranging the control board 14 and the electromagnetic shield 37 inside the housing 40, an increase in the size of the rotating electrical machine 100 can be suppressed.
- Embodiment 2 Next, a description will be given of a rotating electric machine device according to embodiment 2.
- the rotating electric machine device according to this embodiment has the same basic configuration as the rotating electric machine device according to embodiment 1, so the following description will focus on the differences.
- Fig. 8 is a partial cross-sectional view of a rotating electrical machine device 101 according to a second embodiment.
- the fastened portion 39 is not provided, and the second screw 60a is screwed into a female threaded portion 383 formed in the ground bus bar 38.
- the female threaded portion 383 is formed by performing burring and thread cutting on the ground bus bar 38.
- the electromagnetic shield 37 and the ground bus bar 38 are connected.
- a recess 612 is formed in the resin holder 61 to accommodate the tip of the shaft portion of the second screw 60a.
- the electromagnetic shield 37 and the ground bus bar 38 can be electrically connected to each other without providing the fastened portion 39. Therefore, the cost of the rotating electrical machine 101 can be reduced.
- Embodiment 3 Next, a description will be given of a rotating electric machine device according to embodiment 3.
- the rotating electric machine device according to this embodiment has the same basic configuration as the rotating electric machine device according to embodiment 1, so the following description will focus on the differences.
- FIG. 9 is a partial cross-sectional view of a rotating electric machine device 102 according to embodiment 3.
- screws 60a, 60b are not used to fix the ground bus bar 38, and through holes 381, 382 are not formed in the ground bus bar 38.
- a through hole 143 is not formed in the control board 14.
- the first plate portion 38a is joined to the GND pattern 142 of the control board 14 by soldering.
- the first plate portion 38a is surface-mounted to the GND pattern 142 by reflow soldering.
- the second plate portion 38b is in pressure contact with the second top portion 37b.
- the second top portion 37b may bend the ground bus bar 38, and the lower surface of the second top portion 37b may be abutted against the second plate portion 38b.
- the ground bus bar 38 may also be formed of an elastic member such as a leaf spring. In this case, the elastic force of the grounding bus bar 38 can cause the second plate portion 38b to abut more firmly against the second top portion 37b.
- the ground bus bar 38 is also in pressure contact with the second apex 37b by elastically deforming. This allows the electromagnetic shield 37 and the ground bus bar 38 to be electrically connected more reliably.
- FIG. 10 is a view of the control board 14 of the rotating electric machine device 103 according to the fourth embodiment, viewed from the first orthogonal direction X.
- the first apex 37a and the second apex 37b of the electromagnetic shield 37 are indicated by two-dot chain lines.
- the second screw 60a is indicated by a dotted line.
- the second screw 60a when viewed from the first orthogonal direction X, the second screw 60a is disposed at a position overlapping with the center of the control board 14 in the second orthogonal direction Y, and the first screw 60b is disposed at a position away from the center of the control board 14 in the second orthogonal direction Y.
- the axis of the second screw 60a is disposed on a first plane including the axis O of the rotating shaft 21, and the axis of the first screw 60b is disposed on a second plane parallel to the first plane.
- the first screw 60b when viewed from the first orthogonal direction X, the first screw 60b may be positioned at a position overlapping with the center of the control board 14 in the second orthogonal direction Y, and the second screw 60a may be positioned at a position away from the center of the control board 14 in the second orthogonal direction Y.
- Embodiment 5 Next, a description will be given of a rotating electric machine device according to embodiment 5.
- the rotating electric machine device according to this embodiment has a similar basic configuration to the rotating electric machine device according to embodiment 1, so the following description will focus on the differences.
- Embodiment 6 Next, a description will be given of a rotating electric machine device according to embodiment 6.
- the rotating electric machine device according to this embodiment has the same basic configuration as the rotating electric machine device according to embodiment 1, so the following description will focus on the differences.
- Embodiment 8 Next, a description will be given of a rotating electric machine device according to embodiment 8.
- the rotating electric machine device according to this embodiment has the same basic configuration as the rotating electric machine device according to embodiment 1, so the following description will focus on the differences.
- FIG. 14 is a circuit diagram of a rotating electric machine device 107 according to embodiment 8.
- FIG. 15 is a cross-sectional view of the rotating electric machine device 107.
- the rotating electric machine 2 has two sets of three-phase windings. Specifically, the rotating electric machine 2 has a second three-phase winding Ub, Vb, Wb in addition to the three-phase windings Ua, Va, Wa.
- the rotating electric machine device 100 also has two sets of control units 1A, 1B.
- the control units 1A, 1B each have a configuration similar to that of the control unit 1 described in the first embodiment. Therefore, in this embodiment, the suffix "A" is added to the components of the first control unit 1A that are the same as the corresponding components in the first embodiment. Furthermore, the suffix "B" is added to the components of the second control unit 1B that are the same as the corresponding components in the first embodiment.
- the control unit 1A has a control board 14A, a power module 35A, and a busbar unit 36A.
- the control unit 1B has a control board 14B, a power module 35B, and a busbar unit 36B.
- the control units 1A and 1B are covered by a housing 40. At the top of the housing 40, a power connector 42A and a signal connector 43A that are connected to the control unit 1A, and a power connector 42B and a signal connector 43B that are connected to the control unit 1B are arranged.
- the power connector 42A has a first holding member 421A and a power connection terminal 422A (external connection terminal) that extends downward from the first holding member 421A.
- the signal connector 43A has a second holding member 431A and a signal connection terminal 432A that extends downward from the second holding member 431A.
- the power connector 42B has a third holding member 421B and a power connection terminal 422B (external connection terminal) that extends downward from the third holding member 421B.
- the signal connector 43B has a fourth holding member 431B and a signal connection terminal 432B extending downward from the fourth holding member 431B.
- the first holding member 421A, the second holding member 431A, the third holding member 421B, the fourth holding member 431B, and the housing 40 are integrally molded from a resin material.
- the power supply connection terminal 422A, the signal connection terminal 432A, the power supply connection terminal 422B, and the signal connection terminal 432B are accommodated in the housing 40.
- An electromagnetic shield 37 that covers the control units 1A and 1B is provided inside the housing 40.
- the electromagnetic shield 37 has a first top 37a, two second tops 37b located below the first top 37a, and two connection parts 37c that respectively connect the first top 37a and the two second tops 37b.
- a power supply connection terminal 422A, a signal connection terminal 432A, a power supply connection terminal 422B, and a signal connection terminal 432B are inserted into the through holes 371 formed in the first top 37a.
- the heat sink 34 is disposed inside the housing 40.
- the power module 35A is disposed on one side of the column portion 341 of the heat sink 34 in the second orthogonal direction Y.
- the power module 35B is disposed on the other side of the column portion 341 in the second orthogonal direction Y. That is, the power modules 35A and 35B are disposed in the second orthogonal direction Y, sandwiching the column portion 341. Note that in FIG. 15, the positions where the power modules 35A and 35B are disposed are indicated by two-dot chain lines.
- a first terminal connected to the control board 14A is provided at one end of the power module 35A in the first orthogonal direction X
- a second terminal connected to the bus bar unit 36A is provided at the other end.
- a first terminal connected to the control board 14B is provided at one end of the power module 35B in the first orthogonal direction X, and a second terminal connected to the bus bar unit 36B is provided at the other end.
- the control board 14A is disposed on one side of the pillar portion 341 in the first orthogonal direction X.
- the control board 14B is disposed on the other side of the pillar portion 341 in the first orthogonal direction X.
- the control boards 14A and 14B are disposed in the first orthogonal direction X, sandwiching the pillar portion 341 therebetween.
- Capacitors 17b, 17c, and 17d of filter section 17A are disposed on upper section 141A of control board 14A. Capacitors 17b, 17c, and 17d of filter section 17A are disposed between first top 37a and second top 37b in axial direction Z. Capacitors 17b, 17c, and 17d of filter section 17B are disposed on upper section 141B of control board 14B. Capacitors 17b, 17c, and 17d of filter section 17B are disposed between first top 37a and second top 37b in axial direction Z.
- a ground bus bar 38A is provided between the control board 14A and the electromagnetic shield 37.
- the ground bus bar 38A electrically connects the GND pattern 142A of the control board 14A to the electromagnetic shield 37.
- the ground bus bar 38A is attached to the control board 14A by a first screw 60b, and is attached to one of the two second apexes 37b by a second screw 60a.
- the ground bus bar 38A may be fixed in the same manner as in the second and third embodiments.
- a ground bus bar 38B is provided between the control board 14B and the electromagnetic shield 37.
- the ground bus bar 38B electrically connects the GND pattern 142B of the control board 14B to the electromagnetic shield 37.
- the ground bus bar 38B is attached to the control board 14B by a first screw 60b, and is attached to the other of the two second apexes 37b by a second screw 60a.
- the ground bus bar 38B may be fixed in the same manner as in the second and third embodiments.
- the busbar unit 36A is disposed outward from the control board 14A in the first orthogonal direction X.
- the busbar base 361A of the busbar unit 36A is disposed parallel to the control board 14A.
- the busbar unit 36B is disposed outward from the control board 14B in the first orthogonal direction X.
- the busbar base 361B of the busbar unit 36B is disposed parallel to the control board 14B.
- Fig. 16 is a view of the control board 14A as viewed from the first orthogonal direction X.
- the first apex 37a and the second apex 37b of the electromagnetic shield 37 are indicated by two-dot chain lines.
- the second screw 60a is indicated by a dotted line
- the bus bar unit 36A is indicated by a dashed line.
- the busbar unit 36A when viewed from the first orthogonal direction X, the busbar unit 36A is disposed so as to overlap with the control board 14A.
- the busbar unit 36A is disposed so as to be spaced apart from the connection portion (i.e., the first screw 60b) between the ground busbar 38A and the control board 14A in the first orthogonal direction X, and is disposed so as to be spaced apart from the connection portion (i.e., the second screw 60a) between the ground busbar 38A and the electromagnetic shield 37 in the axial direction Z.
- the busbar unit 36B is disposed so as to overlap with the control board 14B.
- the busbar unit 36B is disposed so as to be spaced apart from the connection portion (i.e., the first screw 60b) between the ground busbar 38A and the control board 14B in the first orthogonal direction X, and is disposed so as to be spaced apart from the connection portion (i.e., the second screw 60a) between the ground busbar 38A and the electromagnetic shield 37 in the axial direction Z.
- This allows the busbar units 36A, 36B to be efficiently positioned inside the electromagnetic shield 37, while preventing the busbar units 36A, 36B from contacting the connection portions between the grounding busbars 38A, 38B and the control boards 14A, 14B, and the connection portions between the grounding busbars 38A, 38B and the electromagnetic shield 37.
- the screws 60a, 60b are arranged so that the axis of the second screw 60a, the axis of the first screw 60b, and the axis O of the rotating shaft 21 are located on the same plane. This allows the control boards 14A, 14B to be fixed to the electromagnetic shield 37 at the center in the second orthogonal direction Y using the screws 60a, 60b, improving the vibration resistance and durability of the control boards 14A, 14B.
- connection portion between the ground busbar 38A and the control board 14A (i.e., the first screw 60b) and the connection portion between the ground busbar 38A and the electromagnetic shield 37 (i.e., the second screw 60a) may be disposed at different positions in the second orthogonal direction Y.
- connection portion between the ground busbar 38B and the control board 14B and the connection portion between the ground busbar 38B and the electromagnetic shield 37 may be disposed at different positions in the second orthogonal direction Y.
- the busbar units 36A and 36B are disposed at a distance from the connection portions between the ground busbars 38A and 38B and the control boards 14A and 14B, and the connection portions between the ground busbars 38A and 38B and the electromagnetic shield 37. This prevents the busbar units 36A and 36B from coming into contact with these connection portions. Furthermore, adjusting the positions of the screws 60a and 60b as described above improves the freedom of design. Therefore, the busbar units 36A and 36B can be arranged more efficiently inside the electromagnetic shield 37, and the increase in size of the rotating electrical device 107 can be suppressed.
- Embodiment 9 The rotating electric machine devices according to the first to eighth embodiments can be applied to electric power steering devices for vehicles.
- An electric power steering device 150 according to a ninth embodiment will be described below with reference to Fig. 18. Note that components having the same functions and actions as those in the first embodiment will be given the same reference numerals and descriptions thereof will be omitted.
- FIG. 18 is a schematic diagram of an electric power steering device 150 according to a ninth embodiment.
- the electric power steering device 150 is a rack-type electric power steering device.
- the electric power steering device 150 includes a rotating electric machine device 100, a steering wheel 151, a torque sensor 152, and a speed sensor 153.
- the torque sensor 152 detects the steering torque and outputs it to the rotating electric machine device 100.
- the speed sensor 153 also detects the traveling speed of the vehicle and outputs it to the rotating electric machine device 100.
- the rotating electric machine device 100 generates an auxiliary torque that assists the steering torque based on the input from the torque sensor 152 and the speed sensor 153, and transmits it to the steering mechanism of the front wheels 154 of the vehicle.
- the torque sensor 152 and the speed sensor 153 are part of the sensors 8 in FIG. 1.
- the rotating electric machine device 100 may generate an auxiliary torque based on information other than the torque sensor 152 and the speed sensor 153.
- the rotating electric machine device 100 used in the electric power steering device 150 By making the rotating electric machine device 100 used in the electric power steering device 150 smaller, it becomes easier to mount it on a vehicle. By reducing the cost of the rotating electric machine device 100, the cost of the entire electric power steering device 150 can also be reduced. The same applies when rotating electric machine devices 101 to 107 are used instead of the rotating electric machine device 100.
- the rotating electrical machine 100 may be used for purposes other than the electric power steering device 150.
- the above-described embodiments or modifications may be combined as appropriate.
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Abstract
Description
図1は、実施の形態1における回転電機装置100の回路図である。図2は、回転電機装置100の断面図である。
図1および図2に示されるように、回転電機装置100は、制御ユニット1および回転電機2を有している。制御ユニット1と回転電機2とは一体化されている。回転電機装置100は、例えば、車両に搭載される電動パワーステアリング装置に用いられる。回転電機装置100は、負荷の駆動により発電して回生電力をバッテリ充電に利用する機能を有していてもよい。
なお、回転電機装置100で発生するノイズに応じて、フィルタ部17がコモンモードノイズ用のコイルであるコモンモードコイルを含んでいてもよく、ノーマルモードコイル17aが省略されていてもよく、フィルタ部17に含まれるコンデンサの数が2つ以下、または4つ以上であってもよい。
本明細書では、回転電機2の回転軸21の軸心Oに沿う方向を軸方向Zという。図2に示されるように、回転電機2と制御ユニット1とは、軸方向Zに並べて配置され、一体化されている。軸方向Zにおいて、制御ユニット1が配置された側を上方といい、回転電機2が配置された側を下方という。軸方向Zから見ることを平面視という。軸方向Zから見た図を平面図という。なお、軸方向Zは、鉛直方向と一致していなくてもよい。軸方向Zに直交する一方向を、第1直交方向Xという。軸方向Zおよび第1直交方向Xの双方に直交する方向を、第2直交方向Yという。第1直交方向Xに沿って、回転軸21の軸心Oから離れる側を第1直交方向Xの外側といい、回転軸21の軸心Oに向かう側を第1直交方向Xの内側という。第2直交方向Yに沿って、回転軸21の軸心Oから離れる側を第2直交方向Yの外側といい、回転軸21の軸心Oに向かう側を第2直交方向Yの内側という。
このような構成により、第2のネジ60aの上方に固定用部品を設けることなく、電磁シールド37と接地用バスバー38とを互いに固定することができる。したがって、電磁シールド37とハウジング40との間に、接地用バスバー38の固定のための軸方向Zの距離を確保する必要がなく、軸方向Zにおける制御ユニット1のサイズの増加を抑えることができる。
第1板部38aを制御基板14の第1直交方向Xの外側に配置し、第1のネジ60bを第1直交方向Xの外側から締結するため、例えばヒートシンク34の上方に固定用部品を設けることなく、接地用バスバー38および制御基板14をヒートシンク34に対して固定することができる。したがって、軸方向Zにおける制御ユニット1のサイズの増加を抑えることができる。
電磁シールド37は、第1の頂部37aと第2の頂部37bを有する段付き形状を有する。第1の頂部37aに貫通孔371を形成し、第2の頂部37bを、例えば制御基板14との固定に用いることで、第1の頂部37aの貫通孔371のサイズをより低減することができる。
これにより、フィルタ部17を、接地用バスバー38および電磁シールド37を経由して接地することができる。
第1のネジ60bにより、接地用バスバー38および制御基板14を、ヒートシンク34に対して固定することができる。また、接地用バスバー38と第1のネジ60bとの間には樹脂ホルダ61が配置されており、接地用バスバー38と第1のネジ60bとの間は絶縁されている。したがって、フィルタ部17を、ノイズ源であるパワーモジュール35が取り付けられるヒートシンク34を経由することなく、接地用バスバー38および電磁シールド37を経由して接地することができる。これにより、フィルタ部17によって電源用接続端子422へ伝搬するノイズ成分をより効果的に減衰させることができる。
これにより、第1のネジ60bを用いて、接地用バスバー38および制御基板14を、ヒートシンク34に対して容易に固定することができる。
第2のネジ60aにより、接地用バスバー38を第2の頂部37bに対して固定することができる。
これにより、接地用バスバー38を第2の頂部37bに対してより確実に固定することができる。
これにより、第2のネジ60aを軸方向Zの上方から締結することができ、接地用バスバー38を第2の頂部37bに対してより容易に固定することができる。
これにより、ネジ60a、60bを用いて、制御基板14を、電磁シールド37に対して確実に固定することができ、制御基板14の耐振性および耐久性を向上させることができる。
これにより、接地用バスバー38と制御基板14とを、第1のネジ60bを用いて緩むことなく確実に固定することができ、接地用バスバー38と電磁シールド37とを、第2のネジ60aを用いて緩むことなく確実に固定することができる。したがって、制御基板14の耐振性および耐久性を向上させることができる。
ハウジング40に、制御ユニット1を構成する部品が収容されるため、これら部品の破損を防止することができる。また、制御基板14および電磁シールド37をハウジング40の内側に配置することで、回転電機装置100のサイズの増加を抑制できる。
次に、実施の形態2に係る回転電機装置について説明する。本実施の形態に係る回転電機装置は、基本的な構成は実施の形態1の回転電機装置と同様であるため、異なる点を中心に説明する。
この場合、被締結部39を設けることなく、電磁シールド37と接地用バスバー38とを電気的に接続することができる。したがって、回転電機装置101のコストを低減させることができる。
次に、実施の形態3に係る回転電機装置について説明する。本実施の形態に係る回転電機装置は、基本的な構成は実施の形態1の回転電機装置と同様であるため、異なる点を中心に説明する。
次に、実施の形態4に係る回転電機装置について説明する。本実施の形態に係る回転電機装置は、基本的な構成は実施の形態1の回転電機装置と同様であるため、異なる点を中心に説明する。
なお、第1直交方向Xから見たときに、第1のネジ60bが、制御基板14の第2直交方向Yにおける中央と重なる位置に配置されており、第2のネジ60aが、制御基板14の第2直交方向Yにおける中央から離れた位置に配置されていてもよい。
次に、実施の形態5に係る回転電機装置について説明する。本実施の形態に係る回転電機装置は、基本的な構成は実施の形態1の回転電機装置と同様であるため、異なる点を中心に説明する。
次に、実施の形態6に係る回転電機装置について説明する。本実施の形態に係る回転電機装置は、基本的な構成は実施の形態1の回転電機装置と同様であるため、異なる点を中心に説明する。
次に、実施の形態7に係る回転電機装置について説明する。本実施の形態に係る回転電機装置は、基本的な構成は実施の形態1の回転電機装置と同様であるため、異なる点を中心に説明する。
次に、実施の形態8に係る回転電機装置について説明する。本実施の形態に係る回転電機装置は、基本的な構成は実施の形態1の回転電機装置と同様であるため、異なる点を中心に説明する。
図16に示されるように、第1直交方向Xから見たときに、バスバーユニット36Aは、制御基板14Aと重なるよう配置される。バスバーユニット36Aは、接地用バスバー38Aと制御基板14Aとの接続部分(すなわち、第1のネジ60b)と第1直交方向Xにおいて離間して配置され、接地用バスバー38Aと電磁シールド37との接続部分(すなわち、第2のネジ60a)と軸方向Zにおいて離間して配置されている。同様に、第1直交方向Xから見たときに、バスバーユニット36Bは、制御基板14Bと重なるよう配置される。バスバーユニット36Bは、接地用バスバー38Bと制御基板14Bとの接続部分と第1直交方向Xにおいて離間して配置され、接地用バスバー38Bと電磁シールド37との接続部分と軸方向Zにおいて離間して配置されている。これにより、バスバーユニット36A、36Bが、接地用バスバー38A、38Bと制御基板14A、14Bとの接続部分、および接地用バスバー38A、38Bと電磁シールド37との接続部分と接触することを防止しつつ、電磁シールド37の内側においてバスバーユニット36A、36Bを効率的に配置することができる。
実施の形態1~8に係る回転電機装置は、車両用の電動パワーステアリング装置に適用することができる。以下、実施の形態9に係る電動パワーステアリング装置150について、図18を用いて説明する。なお、実施の形態1と同様の機能及び作用を有する構成要素については、同一の符号を付してその説明を省略する。
Claims (20)
- 回転軸を有する回転電機と、
前記回転軸の軸心に沿う軸方向において前記回転電機と並んで配置され、前記回転電機を制御する制御ユニットと、
前記制御ユニットを覆う電磁シールドと、
を備え、
前記制御ユニットは、
前記軸方向に延び、外部接続端子が接続される制御基板と、
前記外部接続端子へ伝搬するノイズ成分を減衰させるフィルタ部と、
を有し、
前記電磁シールドは、前記制御基板の全体を覆うとともに、前記外部接続端子が挿通される貫通孔を有する第1の頂部と、前記第1の頂部よりも前記回転電機側に配置される第2の頂部と、を有する筒状に形成されており、
前記フィルタ部の少なくとも一部は、前記制御基板に実装され、前記軸方向において、前記第1の頂部と前記第2の頂部との間に配置される、
回転電機装置。 - 前記フィルタ部は、前記制御基板に形成され、前記外部接続端子と電気的に接続される配線パターンを有し、
前記制御ユニットは、前記配線パターンと前記電磁シールドとを電気的に接続する接地用バスバーを有する、
請求項1に記載の回転電機装置。 - 前記電磁シールドの内側に配置されるヒートシンク、をさらに備え、
前記制御ユニットは、
前記接地用バスバーおよび前記制御基板を、前記ヒートシンクに対して固定する第1のネジと、
前記接地用バスバーと前記第1のネジとの間に配置される樹脂部材と、
を有する、
請求項2に記載の回転電機装置。 - 前記第1のネジの軸心に沿った方向において、前記樹脂部材、前記接地用バスバー、前記制御基板、および前記ヒートシンクは、前記回転軸の軸心に向かって、この順に配置されている、
請求項3に記載の回転電機装置。 - 前記制御ユニットは、前記接地用バスバーを、前記第2の頂部に対して固定する第2のネジを有する、
請求項2から4のいずれか一項に記載の回転電機装置。 - 前記制御ユニットは、前記第2の頂部との間で前記接地用バスバーを挟むよう設けられ、前記第2のネジが締結される被締結部を有する、
請求項5に記載の回転電機装置。 - 前記接地用バスバーと前記第2の頂部とは、前記軸方向に並んで配置される、
請求項5または6に記載の回転電機装置。 - 前記接地用バスバーは、前記配線パターンと半田付けにより接合されるとともに、前記第2の頂部と押圧接触されている、
請求項2に記載の回転電機装置。 - 前記接地用バスバーは、弾性変形することで前記第2の頂部と押圧接触されている、
請求項8に記載の回転電機装置。 - 前記制御ユニットは、
接地用バスバーと、
前記接地用バスバーを前記制御基板に取り付ける第1のネジと、
前記接地用バスバーを前記第2の頂部に取り付ける第2のネジと、
を有し、
前記第1のネジの軸心と、前記第2のネジの軸心とは、前記回転軸の軸心を含む同一平面上に配置されている、
請求項1から7のいずれか一項に記載の回転電機装置。 - 前記制御ユニットは、
接地用バスバーと、
前記接地用バスバーを前記制御基板に取り付ける第1のネジと、
前記接地用バスバーを前記第2の頂部に取り付ける第2のネジと、
を有し、
前記第2のネジの軸心は、前記回転軸の軸心を含む第1の平面上に配置されており、前記第1のネジの軸心は、前記第1の平面と平行な第2の平面上に配置されている、
請求項1から7のいずれか一項に記載の回転電機装置。 - 前記第1のネジの軸心は、前記制御基板に対して垂直に配置されており、前記第2のネジの軸心は、前記第2の頂部に対して垂直に配置されている、
請求項10または11に記載の回転電機装置。 - 前記制御ユニットは、前記制御基板と平行に配置され、前記フィルタ部の一部が実装されるバスバー基部、を有し、
前記バスバー基部は、前記接地用バスバーと前記制御基板との接続部分から離間して配置されている、
請求項2から12のいずれか一項に記載の回転電機装置。 - 前記外部接続端子を収容するとともに、前記電磁シールドを覆うハウジング、をさらに備える、
請求項1から13のいずれか一項に記載の回転電機装置。 - 前記フィルタ部はコンデンサを含み、
前記コンデンサが、前記制御基板に実装され、前記軸方向において、前記第1の頂部と前記第2の頂部との間に配置される、
請求項1から14のいずれか一項に記載の回転電機装置。 - 前記フィルタ部はコンデンサおよびコイルを含み、
前記コンデンサおよび前記コイルが、前記制御基板に実装され、前記軸方向において、前記第1の頂部と前記第2の頂部との間に配置される、
請求項1から14のいずれか一項に記載の回転電機装置。 - 前記コンデンサは、前記コンデンサの全体が前記第2の頂部よりも前記第1の頂部側に配置されるよう設けられている、
請求項15または16に記載の回転電機装置。 - 前記コンデンサは、前記軸方向において、前記コンデンサの側面の位置が、前記第2の頂部の外面の位置と一致するように設けられている、
請求項15または16に記載の回転電機装置。 - 前記コンデンサは、前記軸方向において、前記第2の頂部の外面と重なるよう設けられている、
請求項15または16に記載の回転電機装置。 - 請求項1から19のいずれか一項に記載の回転電機装置を備えた電動パワーステアリング装置。
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11289719A (ja) * | 1998-02-04 | 1999-10-19 | Robert Bosch Gmbh | 整流子モ―タ |
| WO2015122069A1 (ja) * | 2014-02-14 | 2015-08-20 | 三菱電機株式会社 | 制御装置付き回転電機、電動パワーステアリング装置および制御装置付き回転電機の製造方法 |
| JP2016163416A (ja) * | 2015-02-27 | 2016-09-05 | 株式会社ジェイテクト | モータユニット |
| JP2019033632A (ja) * | 2017-08-09 | 2019-02-28 | 株式会社ジェイテクト | モータ装置 |
| WO2020110261A1 (ja) * | 2018-11-29 | 2020-06-04 | 三菱電機株式会社 | 電動駆動装置 |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11289719A (ja) * | 1998-02-04 | 1999-10-19 | Robert Bosch Gmbh | 整流子モ―タ |
| WO2015122069A1 (ja) * | 2014-02-14 | 2015-08-20 | 三菱電機株式会社 | 制御装置付き回転電機、電動パワーステアリング装置および制御装置付き回転電機の製造方法 |
| JP2016163416A (ja) * | 2015-02-27 | 2016-09-05 | 株式会社ジェイテクト | モータユニット |
| JP2019033632A (ja) * | 2017-08-09 | 2019-02-28 | 株式会社ジェイテクト | モータ装置 |
| WO2020110261A1 (ja) * | 2018-11-29 | 2020-06-04 | 三菱電機株式会社 | 電動駆動装置 |
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