JP2013038918A - Rotary electric machine - Google Patents

Abstract

In a rotating electrical machine, an induced current generated in a rotor coil is increased.
A rotating electrical machine is arranged to face a stator, and is configured such that N and S poles are alternately formed in a circumferential direction by interlinking of harmonic components included in a magnetic field generated by the stator. Including the rotor 14. The rotor 14 has a rotor core 24 having a plurality of N pole forming salient poles 32n on which N poles are formed and a plurality of S pole forming salient poles 32s on which S poles are formed, and is wound around each N pole forming salient pole 32n. N pole induction coil 28n and N pole common coil 30n, which are two N pole rotor coils, and S pole induction coil 28s and S pole common coil, which are two S pole rotor coils wound around each S pole forming salient pole 32s. 30 s. The N pole induction coil 28n, the N pole common coil 30n, the S pole induction coil 28s, and the S pole common coil 30s are connected to the diode bridge circuit 38.
[Selection] Figure 4

Description

  The present invention relates to a rotating electrical machine including a stator and a rotor configured such that N poles and S poles are alternately formed in the circumferential direction by interlinking of harmonic components included in a magnetic field generated by the stator. About.

  The motor described in Patent Document 1 includes a rotor disposed on the radially inner side of the stator, and the stator includes a plurality of stator coils wound around the plurality of teeth of the stator core by concentrated winding. The rotor includes a plurality of rotor coils wound around a plurality of salient poles protruding in the radial direction of the rotor core. The stator generates a rotating magnetic field by causing a three-phase alternating current to flow through the stator coil. When a magnetic field including harmonic components formed in the stator teeth is linked to the rotor winding, a magnetic flux fluctuation occurs in the rotor coil. . The rotor coil includes, on the salient pole of the rotor, a rotor coil disposed in the vicinity of the gap with the stator, and another rotor coil that is separate from the rotor coil and disposed farther from the stator than the rotor coil.

  Rotor coils wound around adjacent salient poles, and rotor coils arranged far from the stator are connected in series with each other, and mainly have an effect of forming a magnetic field with an induced current. In addition, the rotor coil disposed near the stator mainly has an effect of exciting the induced current. A rotor coil that mainly forms a magnetic field is commonly connected to a rotor coil that mainly excites an induced current and another rotor coil that mainly excites an induced current. A rotor current rectified using a half-wave rectifier circuit is induced in a rotor coil that mainly excites an induced current.

  Moreover, the generator described in Patent Document 2 includes a stator in which a main generator winding and an excitation winding are wound around a stator core, and the same number of poles as the main generator winding on the rotor core. The field windings are magnetically coupled to both the static magnetic field produced by the excitation winding and the odd-order spatial harmonic components of the electron reaction magnetic field produced by the main generator winding. And a rotor wound in an array. The generator also includes a control rectifier that extracts three-phase alternating current from the middle of the main generator winding, full-wave rectifies the induced electromotive force of the main generator winding, and directs the DC to the excitation winding, and the rotor A diode is provided in which the induced electromotive force of each of the plurality of field windings is half-wave rectified and a direct current is passed through the field winding. The electromotive force induced in the field winding is half-wave rectified to increase the main magnetic field of the rotor and increase the electromotive force of the main power generation winding.

JP 2010-279165 A JP-A-8-65976

  The motor described in Patent Document 1 causes an induction current to flow through the rotor coil by interlinking the magnetic field including the harmonic component formed in the teeth of the stator with the rotor coil. Since it is used, only half of the harmonic component can be used, and there is room for improvement in terms of increasing the induced current generated in the rotor coil.

  In the generator described in Patent Document 2, the induced electromotive force of each of the plurality of field windings is half-wave rectified by a diode, and the induced current generated in the field winding that is also a rotor coil is increased. There is room for improvement.

  An object of the present invention is to increase an induced current generated in a rotor coil in a rotating electrical machine.

  In the rotating electrical machine according to the present invention, the N pole and the S pole are alternately formed in the circumferential direction by interlacing the stator and the harmonic component included in the magnetic field generated by the stator that is disposed opposite to the stator. And a rotor core having a plurality of N pole forming salient poles on which the N pole is formed and a plurality of S pole forming salient poles on which the S pole is formed. , Two N pole rotor coils wound around each N pole forming salient pole, and two S pole rotor coils wound around each S pole forming salient pole, the two N pole rotor coils and the two A rotating electric machine is characterized in that the S pole rotor coil is connected to a diode bridge circuit.

  In the rotating electrical machine according to the present invention, preferably, the two N-pole rotor coils include an N-pole first coil wound around the N-pole forming salient poles and the N-poles of the N-pole forming salient poles. An N pole second coil wound closer to the stator than the first coil, and the two S pole rotor coils include an S pole first coil wound around each S pole forming salient pole, And an S pole second coil wound closer to the stator than the S pole first coil of the S pole forming salient pole.

  In the rotating electrical machine according to the present invention, preferably, the N pole first coil and the S pole first coil are connected in series to each other, and the anode-anode connection end and the cathode-cathode of the diode bridge circuit The N pole second coil and the S pole second coil are connected in series with each other and connected between the two anode / cathode connection ends of the diode bridge circuit. Has been.

  According to the rotating electrical machine of the present invention, the induced current generated in the rotor coil can be increased.

It is a schematic sectional drawing which shows the whole structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which takes out and shows a stator from FIG. It is a figure which takes out and shows a rotor from FIG. In embodiment of this invention, it is a schematic diagram which shows the connection state of the rotor coil and diode bridge circuit which were wound around the salient pole of the circumferential direction one part of the rotor. In the embodiment of the present invention, an induced voltage (inductive coil voltage) generated by a magnetic flux interlinked with the induction coil which is the second coil, and a voltage (N + S pole) applied between the two connection terminals P1 and P2 of the diode bridge circuit. An induction coil voltage), a voltage generated between two other connection ends P3 and P4 of the diode bridge circuit (full-wave rectified voltage), and a current (common coil current) flowing through the common coil as the first coil. FIG. In the rotary electric machine of conventional structure, it is a schematic diagram which shows the connection state of the rotor coil wound around the salient pole of the circumferential direction part of the rotor. FIG. 7 is a diagram showing an equivalent circuit of a connection circuit of rotor coils wound around two salient poles adjacent in the circumferential direction of the rotor in the structure of FIG. 6. In the structure of FIG. 6, it is a figure which shows the induced voltage (induction coil voltage) which generate | occur | produces with the magnetic flux linked to an induction coil, and the electric current (common coil current) which flows into a common coil. It is a figure which shows the relationship between the rotation speed of the rotary electric machine which concerns on embodiment of this invention, and the rotary electric machine of the conventional structure of FIG. 6, and a motor torque. FIG. 7 is a circuit diagram showing a connection state between a rotor winding wound around each salient pole and a diode bridge circuit in a first example of another example of the rotating electrical machine according to the embodiment of the present invention. In the 2nd example of another example of the rotating electrical machine concerning an embodiment of the invention, it is a circuit diagram showing a connection state of a rotor coil and a diode bridge circuit wound around each salient pole.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1-5 is a figure which shows embodiment of this invention. FIG. 1 is a schematic cross-sectional view showing the overall configuration of a rotating electrical machine according to an embodiment of the present invention. FIG. 2 is a view showing the stator taken out from FIG. FIG. 3 is a view showing the rotor taken out from FIG. FIG. 4 is a schematic diagram illustrating a connection state between a rotor coil wound around a salient pole in a circumferential direction of the rotor and a diode bridge circuit in the embodiment of the present invention. As shown in FIG. 1, the rotating electrical machine 10 according to the present embodiment functions as an electric motor or a generator, and has a stator 12 fixed to a casing (not shown), a radial gap inside the stator 12 with a predetermined gap. And a rotor 14 that is rotatable with respect to the stator 12. The “radial direction” means a radial direction orthogonal to the rotation center axis of the rotor 14 (hereinafter, the meaning of “radial direction” is the same unless otherwise specified).

  As shown in FIG. 2, the stator 12 includes a stator core 16 made of a magnetic material, and a plurality of phases (more specifically, for example, three phases of a U phase, a V phase, and a W phase) disposed on the stator core 16. 20u, 20v, 20w. A plurality of teeth 18, which are a plurality of first teeth projecting radially inward (toward the rotor 14 (FIG. 1)), are disposed at a plurality of circumferential positions on the inner circumferential surface of the stator core 16. A slot 22 which is a first slot is formed therebetween. The plurality of teeth 18 are arranged at intervals from each other along the circumferential direction around the rotation center axis that is the rotation axis of the rotor 14. The “circumferential direction” refers to a direction along a circle drawn around the rotation center axis of the rotor 14 (hereinafter, the meaning of “circumferential direction” is the same unless otherwise specified).

  The stator coils 20u, 20v, and 20w of each phase are wound around the teeth 18 of the stator core 16 by concentrated short-winding windings through the slots 22. As described above, the stator coils 20u, 20v, and 20w are wound around the teeth 18 to form magnetic poles. Then, by passing a plurality of phases of alternating current through the plurality of phases of the stator coils 20u, 20v, 20w, the teeth 18 arranged in the circumferential direction are magnetized, and a rotating magnetic field that rotates in the circumferential direction is generated in the stator 12. it can. The stator coils 20u, 20v, and 20w are not limited to the configuration in which the coils are wound around the teeth 18 of the stator 12 as described above. It is also possible to generate a rotating magnetic field in the stator 12 by using a toroidal winding for winding the stator coil.

  The rotating magnetic field formed on the teeth 18 acts on the rotor 14 from the tip surface. In the example shown in FIG. 2, one pole pair is constituted by three teeth 18 around which three-phase (U-phase, V-phase, W-phase) stator coils 20u, 20v, 20w are wound.

  On the other hand, as shown in FIG. 3, the rotor 14 includes a rotor core 24 made of a magnetic material and a plurality of rotor coils, an N-pole induction coil 28 n, an N-pole common coil 30 n, an S-pole induction coil 28 s, and an S-pole common. Coil 30s. The rotor core 24 is a plurality of magnetic pole portions provided to protrude radially outward (toward the stator 12 (FIG. 1)) at a plurality of locations in the circumferential direction of the outer peripheral surface, and is a projection, and the second teeth. N pole forming salient poles 32n and S pole forming salient poles 32s. The N pole forming salient poles 32n and the S pole forming salient poles 32s are alternately arranged along the circumferential direction of the rotor core 24 and spaced from each other, and the salient poles 32n and 32s face the stator 12. doing. The rotor yoke, which is an annular portion of the rotor core 24, and the plurality of salient poles 32n, 32s are integrally provided by a magnetic material such as a laminate in which a plurality of magnetic steel plates are laminated. The N pole forming salient pole 32n and the S pole forming salient pole 32s have the same shape and size.

  More specifically, each of the N pole forming salient poles 32n that are every other salient pole in the circumferential direction of the rotor 14 includes two N pole rotor coils, an N pole common coil 30n that is an N pole first coil, An N-pole induction coil 28n, which is an N-pole second coil, is wound in a concentrated manner. Moreover, in the rotor 14, it is another salient pole adjacent to the N pole formation salient pole 32n, and each of the S pole formation salient poles 32s which are every other salient pole in the circumferential direction is two S pole rotor coils. The S pole common coil 30s as the S pole first coil and the S pole induction coil 28s as the S pole second coil are wound by concentrated winding. Further, the rotor 14 has a slot 34 (FIG. 3) which is a second slot formed between the salient poles 32n and 32s adjacent in the circumferential direction. That is, a plurality of slots 34 are formed in the rotor core 24 at intervals in the circumferential direction around the rotation axis of the rotor 14. The rotor core 24 is fitted and fixed on the outer side in the radial direction of the rotary shaft 36.

  Each N-pole induction coil 28n is wound on the tip side of each N-pole forming salient pole 32n, that is, on the side closer to the stator 12 (FIG. 1) than the N-pole common coil 30n. Each S pole induction coil 28 s is wound around the tip side of each S pole forming salient pole 32 s, that is, the side closer to the stator 12 than the S pole common coil 30 s. The induction coils 28n and 28s and the common coils 30n and 30s wound around the salient poles 32n and 32s are respectively along the length direction (vertical direction in FIG. 4) around the salient poles 32n (or 32s). The arranged solenoids may be arranged in an aligned winding in which a plurality of layers are aligned in the circumferential direction (left-right direction in FIG. 4) of the salient poles 32n (or 32s). In addition, the induction coils 28n and 28s wound around the front ends of the salient poles 32n and 32s may be wound around the salient poles 32n and 32s a plurality of times, that is, a plurality of turns.

  As shown in FIG. 4, two salient poles 32n and 32s adjacent in the circumferential direction of the rotor 14 are taken as one set, and each group has an N-pole induction coil 28n wound around one N-pole forming salient pole 32n. The S pole induction coil 28 s wound around one S pole forming salient pole 32 s is connected in series with each other and connected between the two anode / cathode connection terminals P 1 and P 2 of the diode bridge circuit 38. ing.

  Further, each of the two salient poles 32n and 32s as one set is wound around one N pole forming salient pole 32n and one S pole forming salient pole 32s. The S-pole common coil 30s is connected in series with each other, and is connected between the anode-anode connecting end P3 and the cathode-cathode connecting end P4 of the diode bridge circuit 38. Accordingly, the rotating electrical machine 10 (FIG. 1) includes a plurality of diode bridge circuits 38, and each diode bridge circuit 38 includes an N pole induction coil 28n and an N pole common coil 30n wound around one N pole forming salient pole 32n, The S pole induction coil 28s and the S pole common coil 30s wound around one S pole forming salient pole 32s are connected.

  Further, the direction in which the N pole induction coil 28n is wound around the salient pole 32n and the direction in which the S pole induction coil 28s is wound around the salient pole 32s are the same. In contrast, the direction in which the N-pole common coil 30n is wound around the salient pole 32n and the direction in which the S-pole common coil 30s is wound around the salient pole 32s are opposite to each other.

  Moreover, the winding center axis | shaft of each induction coil 28n, 28s and each common coil 30n, 30s corresponds with the radial direction of the rotor 14 (FIG. 3). Each induction coil 28n, 28s and each common coil 30n, 30s are wound around the corresponding salient pole 32n (or 32s) via an insulator (not shown) having electrical insulation made of resin or the like. You can also Since the induction coils 28n and 28s and the common coils 30n and 30s are arranged in this way, the winding centers of the induction coils 28n and 28s and the common coils 30n and 30s with respect to the circumferential direction of the rotor 14 as shown in FIG. A d-axis magnetic path is formed in the magnetic pole direction that is the axial direction, and a q-axis magnetic path is formed at a position between the winding central axes of the induction coils 28n and 28s and the common coils 30n and 30s in the circumferential direction of the rotor 14. The In FIG. 3, the d-axis direction and the q-axis direction when the rotor 14 rotates in the arrow α direction are indicated by arrows.

  In such a configuration, the rectified current flows through the common coils 30n and 30s, whereby the salient poles 32n and 32s are magnetized and function as magnetic pole portions. Returning to FIG. 2, the stator 12 generates a rotating magnetic field by flowing an alternating current through the stator coils 20u, 20v, and 20w. This rotating magnetic field is higher than the fundamental wave as well as the fundamental wave component. It contains a magnetic field of harmonic components of the order.

  More specifically, the distribution of magnetomotive force that generates a rotating magnetic field in the stator 12 is caused by the arrangement of the stator coils 20u, 20v, and 20w of each phase and the shape of the stator core 16 by the teeth 18 and the slots 22 (fundamental wave). Only) and not including a sine wave distribution but including harmonic components. In particular, in the concentrated winding, the stator coils 20u, 20v, 20w of the respective phases do not overlap with each other, so that the amplitude level of the harmonic component generated in the magnetomotive force distribution of the stator 12 increases. For example, when the stator coils 20u, 20v, and 20w are three-phase concentrated windings, the harmonic component is a temporal third-order component of the input electrical frequency, and the amplitude level of the spatial second-order component increases. The harmonic components generated in the magnetomotive force due to the arrangement of the stator coils 20u, 20v, 20w and the shape of the stator core 16 are called spatial harmonics.

  When a rotating magnetic field including this spatial harmonic component acts on the rotor 14 (FIG. 3) from the stator 12, leakage magnetic flux leaks into the space between the adjacent salient poles 32n and 32s of the rotor 14 due to magnetic flux fluctuation of the spatial harmonic. As a result, inductive voltages are generated in the induction coils 28n and 28s wound around the adjacent N pole forming salient poles 32n and S pole forming salient poles 32s shown in FIG. In addition, the induction coils 28n and 28s on the tip side of the salient poles 32n and 32s close to the stator 12 mainly have a function of generating an induction current, and the common coils 30n and 30s far from the stator 12 mainly project. It has a function of magnetizing the poles 32n and 32s, that is, functions as an electromagnet.

  In the present embodiment, since the two induction coils 28n and 28s are connected in series, for example, when the number of turns of each induction coil 28n and 28s is the same, the number of turns is a combination of the two induction coils 28n and 28s. The AC voltage having a large amplitude, such as a double voltage, is applied between the two anode-cathode connection terminals P1 and P2 of the diode bridge circuit 38. Therefore, a full-wave rectified voltage having a large amplitude is generated between the anode-anode connecting end P3 and the cathode-cathode connecting end P4 of the diode bridge circuit 38, and this full-wave rectified voltage is generated in the two common coils 30n and 30s. Works. Therefore, a magnetic flux is generated in the rotor 14 in the direction indicated by the arrow β in FIG. 4 due to the current based on the full-wave rectified voltage in each of the common coils 30n and 30s. As a result, the salient poles 32n and 32s around which the common coils 30n and 30s are wound are magnetized, so that the salient poles 32n and 32s function as a magnetic pole portion that is a magnet with a fixed magnetic pole.

  As shown in FIG. 4, the winding direction is reversed between the N-pole common coil 30n and the S-pole common coil 30s adjacent in the circumferential direction, and the magnetization directions are reversed between the salient poles 32n and 32s adjacent in the circumferential direction. . In the illustrated example, an N pole is generated at the tip of an N pole forming salient pole 32n wound with an N pole common coil 30n, and an S pole is formed at the tip of an S pole forming salient pole 32s wound with an S pole common coil 30s. A pole is generated. For this reason, the N pole and the S pole are alternately arranged in the circumferential direction of the rotor 14. That is, the rotor 14 is configured such that N-poles and S-poles are alternately formed in the circumferential direction by interlinking of harmonic components included in the magnetic field generated by the stator 12.

Also, as shown in FIG. 3, the width θ of each induction coil 28n, 28s and each common coil 30n, 30s in the circumferential direction of the rotor 14 is set shorter than the width corresponding to 180 ° in terms of the electrical angle of the rotor 14. The induction coils 28n and 28s and the common coils 30n and 30s are wound around the salient poles 32n and 32s in a short-pitch manner, respectively. Here, regarding the width θ of each induction coil 28n, 28s and each common coil 30n, 30s, each induction coil 28n, 28s, It can be represented by the center width of the cross section of each common coil 30n, 30s. That is, the width θ can be expressed by the average value of the widths of the inner and outer peripheral surfaces of the induction coils 28n and 28s and the common coils 30n and 30s. The electrical angle of the rotor 14 is represented by a value obtained by multiplying the mechanical angle of the rotor 14 by the number of pole pairs p of the rotor 14 (electrical angle = mechanical angle × p). For this reason, the width θ of each induction coil 28n, 28s and each common coil 30n, 30s in the circumferential direction is defined as the distance from the rotation center axis of the rotor 14 to each induction coil 28n, 28s and each common coil 30n, 30s as r. Then, the following expression (1) is satisfied.
θ <π × r / p (1)

  In the rotating electrical machine 10 described above, a rotating magnetic field (fundamental wave component) formed in the teeth 18 acts on the rotor 14 by passing a three-phase alternating current through the three-phase stator coils 20u, 20v, and 20w, and accordingly, Thus, the salient poles 32n and 32s are attracted to the rotating magnetic field of the teeth 18 so that the magnetic resistance of the rotor 14 is reduced. As a result, torque (reluctance torque) acts on the rotor 14.

  In addition, the magnetic field of the magnet to which the magnetic poles generated by the salient poles 32n and 32s are fixed interacts with the rotating magnetic field (fundamental wave component) generated by the stator 12, thereby causing attraction and repulsion. Torque (torque corresponding to magnet torque) is also applied to the rotor 14 by electromagnetic interaction (attraction and repulsion) between the rotating magnetic field (fundamental wave component) generated by the stator 12 and the magnetic field of the salient poles 32n and 32s. The rotor 14 is driven to rotate in synchronization with the rotating magnetic field (fundamental wave component) generated by the stator 12. As described above, the rotating electrical machine 10 can function as an electric motor (motor) that generates power (mechanical power) in the rotor 14 using electric power supplied to the stator coils 20u, 20v, and 20w.

  Furthermore, as described above, the N pole induction coil 28n and the N pole common coil 30n, which are two N pole rotor coils, and the S pole induction coil 28s and the S pole common coil 30s, which are two S pole rotor coils, Since it is connected to the diode bridge circuit 38, a full-wave rectified voltage having a large amplitude acts on the two common coils 30n and 30s as described above. Therefore, the induced current generated in each common coil 30n, 30s can be increased with high efficiency based on this full-wave rectified voltage, a large magnetic flux is generated inside the rotor 14, and the magnetic force of each salient pole 32n, 32s becomes stronger. Therefore, the torque of the rotating electrical machine 10 can be increased.

  This will be described in detail with reference to FIG. FIG. 5 shows an induced voltage (inductive coil voltage) generated by a magnetic flux interlinked with the induction coil and a voltage (N + S pole induction coil voltage) applied between the two connection terminals P1 and P2 of the diode bridge circuit in the present embodiment. ), A voltage (full-wave rectified voltage) generated between two other connection ends P3 and P4 of the diode bridge circuit, and a current (common coil current) flowing through the common coil. In the following description, the same elements as those shown in FIGS. As shown in FIG. 5, since the N pole induction coil 28n and the S pole induction coil 28s wound around the salient poles 32n and 32s adjacent to each other are connected in series in the same winding direction, the magnetic field generated by the stator 12 is affected. Based on the contained spatial harmonics, the magnetic flux generated between the adjacent salient poles 32n and 32s of the rotor 14 is linked to the induction coils 28n and 28s, so that the salient poles 32n and 32s fluctuate in the same manner. AC voltage is generated. Therefore, the “N + S pole induction coil voltage” which is the sum of the “N pole induction coil voltage” and the “S pole induction coil voltage” between the two connection ends P1 and P2 of the diode bridge circuit 38 shown in FIG. AC voltage is applied. Then, a “full-wave rectified voltage” based on this AC voltage is generated between the other two connection ends P3 and P4 of the diode bridge circuit 38 and applied to the N-pole common coil 30n and the S-pole common coil 30s. That is, the induction voltages of the induction coils 28n and 28s can always be used in the common coils 30n and 30s. Therefore, a large common coil current based on this full-wave rectified voltage can be obtained with high efficiency in each of the common coils 30n and 30s, and the magnetic flux flowing inside the rotor 14 can be increased. As a result, the electromagnets generated by the salient poles 32n and 32s can be strengthened, and the torque of the rotating electrical machine 10 can be increased.

  Further, as described above, the width θ of each induction coil 28n, 28s and each common coil 30n, 30s in the circumferential direction of the rotor 14 is set to be shorter than the width corresponding to 180 ° in terms of the electrical angle of the rotor 14, and each induction The coils 28n and 28s and the common coils 30n and 30s are wound around the salient poles 32n and 32s by short-pitch winding, respectively. For this reason, the induced electromotive force due to the spatial harmonics of the rotating magnetic field generated in each induction coil 28n, 28s and each common coil 30n, 30s can be increased. For this reason, the magnetic flux generated by each of the salient poles 32n and 32s can be increased efficiently, and the torque of the rotating electrical machine 10 can be increased efficiently. Further, from the aspect of further increasing the amplitude of the interlinkage magnetic flux to each induction coil 28n, 28s and each common coil 30n, 30s due to spatial harmonics, each induction coil 28n, 28s and each common coil 30n, 30s in the circumferential direction is increased. The width θ is preferably equal (or substantially equal) to a width corresponding to 90 ° in terms of the electrical angle of the rotor 14. In addition, among the induction coils 28n, 28s and the common coils 30n, 30s, at least only the width θ of each induction coil 28n, 28s may be set shorter than the width corresponding to 180 ° in terms of the electrical angle of the rotor 14. it can.

  In addition, unlike the case of the present embodiment, in the case of the configuration described in Patent Document 2, it is necessary to provide an excitation winding on the stator separately from the three-phase main power generation winding provided on the stator. is there. In addition, a cable that connects the main power generation winding and the excitation winding provided in the stator and extracts the voltage from the main power generation winding is required. For this reason, in the structure described in said patent document 2, a rotary electric machine enlarges and becomes a factor which increases cost. On the other hand, according to the present embodiment, it is possible to eliminate the inconveniences and to reduce the cost of the rotating electric machine and to reduce the cost.

  Next, in order to confirm the effect of this embodiment, the result of comparing the torques of the conventional rotating electrical machine and the rotating electrical machine of this embodiment will be described. First, the configuration of a conventional rotating electrical machine will be described with reference to FIGS. FIG. 6 is a schematic diagram showing a connection state of a rotor coil wound around a salient pole in a circumferential direction of the rotor in a conventional rotating electrical machine. FIG. 7 is a diagram showing an equivalent circuit of a connection circuit of rotor coils wound around two salient poles adjacent in the circumferential direction of the rotor in the structure of FIG. 6 to 8 is the same as the configuration of the present embodiment shown in FIGS. 1 to 4 except for the rotor coil connection circuit. That is, in the conventional structure shown in FIG. 6, two N-pole forming salient poles 32n and S-pole forming salient poles 32s adjacent to each other in the circumferential direction of the rotor 14 are taken as one set, and one N One end of the N pole induction coil 40n wound around the pole forming salient pole 32n and one end of the S pole induction coil 40s wound around one S pole forming salient pole 32s are connected to the first diode 44 and the second diode 46. Connected through. That is, as shown in FIG. 7, one end of the N-pole induction coil 40n and the S-pole induction coil 40s is connected at the connection point R via the first diode 44 and the second diode 46 whose forward directions are opposite to each other. ing. The N-pole induction coil 40n and the S-pole induction coil 40s are wound around the corresponding salient poles 32n (or 32s) in opposite directions.

  Further, one end of an N-pole common coil 42n wound around one N-pole forming salient pole 32n in each set is connected to one end of an S-pole common coil 42s wound around one S-pole forming salient pole 32s. ing. The N-pole common coil 42n and the S-pole common coil 42s are connected to each other in series to form a connection common coil element 48. Further, the other end of the N-pole common coil 42n is connected to the connection point R, and the other end of the S-pole common coil 42s is the other end opposite to the connection point R between the N-pole induction coil 40n and the S-pole induction coil 40s. Connected to.

  The manner in which the induced current flows through the common coils 42n and 42s in such a conventional rotating electric machine will be described with reference to FIG. FIG. 8 is a diagram showing an induced voltage (induction coil voltage) generated by a magnetic flux interlinked with the induction coil and a current (common coil current) flowing in the common coil in the structure of FIG. In the following description, the elements shown in FIGS. 1 to 4 or the same elements as those shown in FIGS. In a rotating electrical machine having a conventional structure, spatial harmonics included in the magnetic field generated by the stator 12 are linked to the induction coils 40n and 40s. The induction coils 40n and 40s have diodes 44, Only the current in the direction corresponding to the forward direction of 46 flows, and the N-pole induction coil 40n and the S-pole induction coil 40s are wound around the corresponding salient poles 32n (or 32s) in opposite directions. For this reason, based on the harmonic component of the magnetomotive force generated by the stator 12, based on the fluctuation of the magnetic flux flowing between the adjacent salient poles 32n and 32s of the rotor 14, as shown in FIG. And the S-pole induction coil 40s generate alternating voltages that are alternately positive (N-pole induction coil voltage, S-pole induction coil voltage), and alternately rectified induced currents flow. As a result, full-wave rectified common coil current flows through each of the common coils 42n and 42s. In such a conventional structure, as is apparent from a comparison between the embodiment described with reference to FIG. 5 and FIG. 8, the common coil current obtained in each of the common coils 42n and 42s is the same as that in FIG. It becomes smaller than the case of form. In other words, according to the above embodiment, the common coil current can be increased as compared with the conventional structures shown in FIGS.

  FIG. 9 is a diagram showing the relationship between the rotational speed and motor torque between the rotating electrical machine according to the present embodiment shown in FIGS. 1 to 5 and the rotating electrical machine having the conventional structure shown in FIGS. In FIG. 9, the solid line a represents the case of the embodiment, and the broken line b represents the case of the conventional structure. As is clear from the torque comparison between the embodiment shown in FIG. 8 and the conventional structure, in the embodiment, the common coil current increases compared to the conventional structure, so that the torque can be increased in almost all rotation regions. It can be seen that both can be increased.

  In the present embodiment, the induction coils 28n and 28s and the common coils 30n and 30s can be formed of different materials. For example, each common coil 30n, 30s is formed of a conductive material such as copper wire, and each induction coil 28n, 28s is lighter than the conductive material constituting the common coil 30n, 30s, such as aluminum or an aluminum alloy. It can also be formed of another conductive material.

  Further, as shown in FIG. 3 above, in the middle portion in the longitudinal direction of each salient pole 32n, 32s, from between the portion where the induction coils 28n, 28s are wound and the portion where the common coils 30n, 30s are wound. The winding drop-off prevention unit 50 is protruded, and the common coils 30n and 30s are locked to the winding drop-off prevention unit 50 so that the common coils 30n and 30s do not fall off due to the centrifugal force accompanying the rotation of the rotor 14. You can also. For example, the winding drop prevention part 50 is a protrusion that protrudes in the circumferential direction of the salient poles 32n and 32s, and the common coils 30n and 30s are provided in the part from the root of each salient pole 32n and 32s to the winding drop prevention part 50. Can be wound. In addition, although not shown in the drawings, it is possible to prevent the induction coils 28n and 28s from falling off due to the centrifugal force by providing flanges protruding in the circumferential direction from both circumferential sides of the tip portions of the salient poles 32n and 32s. You can also.

  Although not shown in the drawings, each auxiliary pole 32n, 32s has magnetism that protrudes in the direction inclined from the both sides or one side in the circumferential direction to the outer side in the radial direction toward the tip. The salient poles can be formed integrally with the salient poles 32n and 32s. When such an auxiliary salient pole is formed, a spatial harmonic that is a harmonic component included in the rotating magnetic field generated by the stator 12 and interlinks with the induction coils 28n and 28s, for example, a space 2 that is third order in time. The next harmonic component can be effectively increased by the auxiliary salient pole. For example, many magnetic fluxes of harmonic components of the magnetomotive force distribution generated in the stator 12 are guided from the teeth 18 of the stator 12 to the salient poles 32n and 32s via the auxiliary salient poles, and much in the induction coils 28n and 28s. The magnetic flux can be interlinked. It is also possible to induce a large amount of magnetic flux of harmonic components from the tooth 18 to the auxiliary salient pole via the salient poles 32n and 32s, and to link a lot of magnetic flux to the induction coils 28n and 28s. For this reason, it is an electromagnet formed on the salient poles 32n and 32s by increasing the change in the magnetic flux density of the magnetic flux interlinking with the induction coils 28n and 28s and increasing the induced current induced in the induction coils 28n and 28s. The magnetic force of the magnetic pole can be increased. For this reason, the rotor magnetic force can be increased, and the torque of the rotating electrical machine can be further increased. For example, the auxiliary salient poles can be protruded from between the portions where the induction coils 28n, 28s are wound and the portions where the common coils 30n, 30s are wound, on both circumferential sides of the salient poles 32n, 32s.

  Next, FIG. 10 is a circuit diagram showing a connection state between a rotor winding wound around each salient pole and a diode bridge circuit in a first example of another example of the rotating electrical machine according to the embodiment of the present invention. . In the following description, the same elements as those in the embodiment shown in FIGS. In the embodiment shown in FIGS. 1 to 5, the rotor 14 is provided with a plurality of diode bridge circuits 38 (FIG. 4) corresponding to a plurality of sets of N pole forming salient poles 32 n and S pole forming salient poles 32 s. . In contrast, in the configuration example of FIG. 10, only one diode bridge circuit 38 is provided in the rotor 14. That is, all of the induction coils 28n and 28s wound around the salient poles 32n and 32s of the rotor 14 are connected in series to form the connection induction coil element 52, and the two anode / cathode connection ends of the diode bridge circuit 38 are formed. A connection induction coil element 52 is connected between P1 and P2.

  In addition, the common coil elements 30n and 30s wound around the salient poles 32n and 32s of the rotor 14 are all connected in series to form a connection common coil element 54, and the anode-anode connection terminal P3 of the diode bridge circuit 38 A connection common coil element 54 is connected between the cathode and cathode connection end P4.

  According to such a configuration example, since the number of induction coils 28n and 28s connected in series between the two anode / cathode connection terminals P1 and P2 of the diode bridge circuit 38 increases, the two anode / cathode connection terminals The amplitude of the voltage applied between P1 and P2 can be further increased, and the amplitude of the full-wave rectified voltage generated between the anode / anode connection terminal P3 and the cathode / cathode connection terminal P4 of the diode bridge circuit 38 can be further increased. Other configurations and operations are the same as those of the embodiment shown in FIGS.

  FIG. 11 is a circuit diagram showing a connection state between a rotor winding wound around each salient pole and a diode bridge circuit in a second example of another example of the rotating electrical machine according to the embodiment of the present invention. In the following description, the same elements as those in the embodiment shown in FIGS. Also in the configuration example of FIG. 11, only one diode bridge circuit 38 is provided in the rotor 14 as in the configuration example of FIG. That is, a plurality of N-pole induction coils 28 n and S-pole induction coils 28 s wound around two salient poles 32 n and 32 s adjacent in the circumferential direction of the rotor 14 are connected in series as a set of connection induction coil elements 56. A set of connection induction coil elements 56 are connected in parallel to each other and between the two anode-cathode connection terminals P1 and P2 of the diode bridge circuit 38.

  A plurality of N-pole common coils 30n and S-pole common coils 30s wound around two salient poles 32n and 32s adjacent to each other in the circumferential direction of the rotor 14 are connected in series as a set of connection common coil elements 58. A set of connection common coil elements 58 are connected in parallel to each other and between the anode-anode connection terminal P3 and the cathode-cathode connection terminal P4 of the diode bridge circuit 38.

  According to such a configuration example, the number of induction coils 28n and 28s connected in series between the two anode / cathode connection ends P1 and P2 of the diode bridge circuit 38 is smaller than in the configuration example of FIG. Therefore, the voltage applied between the two anode / cathode connection terminals P1 and P2 is reduced, but the current input to each anode / cathode connection terminal P1 and P2 can be increased. Other configurations and operations are the same as those of the embodiment shown in FIGS.

  Note that a part of the configuration example of FIG. 10 and a part of the configuration example of FIG. 11 can be combined. For example, in the configuration example of FIG. 10, a plurality of sets of connection common coil elements 58 connected in parallel as shown in FIG. 11 are provided between the anode / anode connection end P3 and the cathode / cathode connection end P4 of the diode bridge circuit 38. It can also be connected. Further, in the configuration example of FIG. 11, between the anode / anode connection terminal P3 and the cathode / cathode connection terminal P4 of the diode bridge circuit 38, all the common coils 30n and 30s are connected in series as shown in FIG. A common coil element 54 can also be connected.

  Further, in the configuration example of FIG. 10 or FIG. 11, all N pole induction coils 28n are connected in series and all S pole induction coils 28s are connected in series, or all N pole commons are connected. A coil 30n connected in series and a series connection of all S-pole common coils 30s can also be connected in parallel. Further, in the configuration of FIG. 4, FIG. 10 or FIG. 11, two common coils 30n, 30s or all common coils 30n are connected between the anode / anode connection terminal P3 and the cathode / cathode connection terminal P4 of the diode bridge circuit 38. 30s can be connected in parallel.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment at all, and it can implement with a various form in the range which does not deviate from the summary of this invention. Of course. In the present invention, for example, a configuration including an axial gap type rotating electrical machine or the like may be employed.

  10 rotating electrical machines, 12 stators, 14 rotors, 16 stator cores, 18 teeth, 20u, 20v, 20w stator coils, 22 slots, 24 rotor cores, 28n N pole induction coils, 28s S pole induction coils, 30n N pole common coils, 30s S Polar common coil, 32n N pole forming salient pole, 32s S pole forming salient pole, 34 slots, 36 rotating shaft, 38 diode bridge circuit, 40n N pole induction coil, 40s S pole induction coil, 42n N pole common coil, 42s S Polar common coil, 44 1st diode, 46 2nd diode, 48 connection common coil element, 50 winding drop-off prevention part, 52 connection induction coil element, 54 connection common coil element, 56 connection induction coil element, 58 connection common coil element .

Claims (3)

A stator,
A rotor configured to be opposed to the stator and configured so that N poles and S poles are alternately formed in the circumferential direction by interlinking of harmonic components included in a magnetic field generated by the stator,
The rotor is
A rotor core having a plurality of N pole forming salient poles in which the N pole is formed, and a plurality of S pole forming salient poles in which the S pole is formed;
Two N pole rotor coils wound around each N pole forming salient pole, and two S pole rotor coils wound around each S pole forming salient pole,
The rotating electric machine, wherein the two N-pole rotor coils and the two S-pole rotor coils are connected to a diode bridge circuit. In the rotating electrical machine according to claim 1,
The two N pole rotor coils are wound closer to the stator than the N pole first coil of each N pole forming salient pole and the N pole first coil of each N pole forming salient pole. An N pole second coil,
The two S-pole rotor coils are wound on the side closer to the stator than the S-pole first coil wound around each S-pole forming salient pole and the S-pole first coil of each S-pole forming salient pole. A rotating electrical machine comprising a pole second coil. The rotating electrical machine according to claim 2,
The N pole first coil and the S pole first coil are connected in series with each other, and are connected between an anode-anode connecting end and a cathode-cathode connecting end of the diode bridge circuit,
The rotating electric machine characterized in that the N-pole second coil and the S-pole second coil are connected in series to each other and are connected between two anode-cathode connection ends of the diode bridge circuit.

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