JP2018011424A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of outputting a high torque at a low cost while securing robustness and easiness of maintenance.SOLUTION: A rotary electric machine comprises: a stator 10 that has a concentratedly-wound armature coil 12 for generating an armature magnetic flux; an outer rotor 20 arranged radially inside the stator 10 and that rotates by passage of the armature magnetic flux; and an inner rotor 30 arranged radially inside the outer rotor 20. The outer rotor 20 has a plurality of outer teeth 21 around which an induction coil 22 for inducing an induction current on the basis of a high harmonic component of a magnetic flux generated at an armature coil 12, and a field coil 23 for generating a magnetic field by energization of the induction current are wound. The inner rotor 30 has an excitation coil for excitation by the armature magnetic flux and the magnetic flux generated at the field coil 23.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotating electrical machine.

  Patent Document 1 discloses a first stator in which a plurality of first stator windings are arranged, and a first stator in which a plurality of first rotor windings are arranged inside the first stator in the radial direction. A rotor, and a third rotor disposed between the first stator and the first rotor and having a permanent magnet disposed thereon, and the first rotor is driven at a higher rotational speed than the third rotor (slip is A technique is disclosed in which the regenerative torque of the first rotor is transmitted to the third rotor as a reaction torque.

JP 2009-73472 A

  However, in such a rotating electrical machine, when the regenerative torque of the first rotor is low, a current is passed through the first rotor winding to increase the regenerative torque of the first rotor, or the permanent magnet included in the third rotor. Or increase the number of

  When an electric current is passed through the first rotor winding, it is necessary to pass an electric current through the slip ring, and there are problems in robustness and ease of maintenance. When the number of magnets included in the third rotor is increased, there is a problem of high cost due to a large amount of magnets.

  Accordingly, an object of the present invention is to provide a rotating electrical machine that can output high torque at low cost while ensuring robustness and ease of maintenance.

  In order to solve the above-described problems, the present invention provides a stator having concentrated winding armature coils that generate armature magnetic flux, an outer rotor that is disposed radially inward of the stator and rotates by passage of the armature magnetic flux, An inner rotor disposed radially inward of the outer rotor, the outer rotor including an induction coil that induces an induction current based on a harmonic component of magnetic flux generated in the armature coil, and A plurality of outer teeth wound with a field coil that generates a magnetic field by energization of an induced current, and the inner rotor passes through the outer teeth and interlinks with the armature magnetic flux and the field A magnetic flux generated by the coil and a plurality of inner teeth around which an exciting coil to be excited is wound.

  Thus, according to the present invention, it is possible to provide a rotating electrical machine that can output high torque at low cost while ensuring robustness and ease of maintenance.

FIG. 1 is a cross-sectional view of a rotating electrical machine according to an embodiment of the present invention cut along a plane perpendicular to the rotation axis. FIG. 2 is a cross-sectional view showing details of a rotating electrical machine according to an embodiment of the present invention. FIG. 3 is a perspective view showing a lid member of a rotating electrical machine according to an embodiment of the present invention. FIG. 4 is a cross-sectional view showing details of the inner rotor of the rotating electrical machine according to one embodiment of the present invention. FIG. 5 is a connection diagram of an exciting coil of an inner rotor of a rotating electrical machine according to an embodiment of the present invention. FIG. 6 is a schematic diagram showing the connection of the induction coil, field coil, and diode in the rotating electrical machine according to one embodiment of the present invention. FIG. 7 is a cross-sectional view showing magnetic flux density and magnetic flux lines generated in the rotating electrical machine according to one embodiment of the present invention. FIG. 8 is a cross-sectional view showing the magnetic flux density and magnetic flux lines of the second spatial harmonic generated in the rotating electrical machine according to one embodiment of the present invention. FIG. 9 is a graph showing current phase torque characteristics of the rotating electrical machine according to one embodiment of the present invention. FIG. 10 is a diagram illustrating a configuration of a hybrid drive system including a rotating electrical machine according to an embodiment of the present invention. FIG. 11 is a collinear diagram of a rotating electrical machine according to an embodiment of the present invention. FIG. 12 is a cross-sectional view of a conventional rotating electrical machine having a permanent magnet cut along a plane perpendicular to the rotation axis. FIG. 13 is a graph showing current phase torque characteristics of the rotating electrical machine shown in FIG. FIG. 14 is a cross-sectional view of a conventional rotating electrical machine with a reduced number of permanent magnets cut along a plane perpendicular to the rotation axis. FIG. 15 is a graph showing the current phase torque characteristics of the rotating electrical machine shown in FIG.

  A rotating electrical machine according to an embodiment of the present invention includes a stator having a concentrated winding armature coil that generates an armature magnetic flux, and an outer rotor that is disposed radially inward of the stator and rotates by passage of the armature magnetic flux. And an inner rotor disposed radially inward of the outer rotor, the outer rotor including an induction coil for inducing an induced current based on a harmonic component of a magnetic flux generated in the armature coil and an induced current The outer rotor has a plurality of outer teeth wound with a field coil that generates a magnetic field by energization, and the inner rotor has an armature magnetic flux that passes through the outer teeth, and a magnetic flux generated by the field coil. It is comprised so that it may have several inner teeth by which the exciting coil which excites by is wound.

  Thereby, the rotary electric machine which concerns on one embodiment of this invention can output a high torque at low cost, ensuring robustness and the ease of a maintenance.

DESCRIPTION OF EMBODIMENTS Hereinafter, a rotating electrical machine according to an embodiment of the present invention will be described in detail with reference to the drawings.
In FIG. 1, a rotating electrical machine 1 according to an embodiment of the present invention includes a stator 10 that is formed in a substantially cylindrical shape, an outer rotor 20 that is opposed to the inner side in the radial direction via the stator 10 and an air gap, An outer rotor 20 and an inner rotor 30 disposed opposite to each other in the radial direction via an air gap. The outer rotor 20 and the inner rotor 30 are respectively supported by a motor case (not shown) so as to be relatively rotatable with the rotation shaft 40 as a rotation center.

  The “radial direction” is a direction orthogonal to the direction in which the rotating shaft 40 extends, and is indicated in the radial direction about the rotating shaft 40. “Outside in the radial direction” means a side far from the rotary shaft 40 in the radial direction, and “inside in the radial direction” means a side close to the rotary shaft 40 in the radial direction.

  The “circumferential direction” indicates a circumferential direction around the rotation axis 40. The “axial direction” indicates a direction in which the rotating shaft 40 extends.

(Stator)
In FIG. 2, the stator 10 includes a stator core 11 and an armature coil 12. FIG. 2 shows a radial cross-sectional view of 90 degrees (1/4) of a mechanical angle of 360 degrees. The stator core 11 is formed from a magnetic member having a high magnetic permeability, for example, a plurality of electromagnetic steel plates laminated in the axial direction.

  A plurality of stator teeth 13 are formed on the radially inner side of the stator core 11, that is, on the side facing the outer rotor 20. The stator teeth 13 protrude radially inward from the stator core 11 and are formed in a plurality at predetermined intervals in the circumferential direction.

  Slots 14 that are groove-like spaces are formed between stator teeth 13 that are adjacent in the circumferential direction. The slot 14 accommodates armature coils 12 corresponding to the three-phase AC W-phase, V-phase, and U-phase. The armature coil 12 is wound around the stator teeth 13 by concentrated winding. The armature coil 12 generates magnetic flux (armature magnetic flux) by energization.

  The stator 10 generates a rotating magnetic field that rotates in the circumferential direction when a three-phase alternating current is supplied to the armature coil 12. The stator 10 rotates the outer rotor 20 by interlinking the generated armature magnetic flux with the outer rotor 20.

  As described above, the stator 10 has the armature coil 12 concentratedly wound around the stator teeth 13. For this reason, when three-phase alternating current is supplied to the armature coil 12, the stator 10 has a harmonic rotating magnetic field that is asynchronous with the rotation of the outer rotor 20 in addition to the rotating magnetic field that rotates in synchronization with the rotation of the outer rotor 20. Will occur. This harmonic rotating magnetic field includes second-order spatial harmonics in the stationary coordinate system (third-order time harmonics in the synchronous rotating coordinate system). Therefore, the harmonic component is superimposed on the magnetic flux generated in the stator 10.

(Outer rotor)
The outer rotor 20 includes an outer tooth 21, an induction coil 22, a field coil 23, and a bridge portion 24.

  The outer teeth 21 are made of a magnetic material such as steel having a high magnetic permeability, and form a magnetic path therein. The bridge portion 24 is formed integrally with the outer teeth 21 so as to connect the outer teeth 21 adjacent in the circumferential direction. Therefore, the outer teeth 21 adjacent in the circumferential direction are connected by the bridge portion 24.

  A guide pole 25 extending from the bridge portion 24 toward the outer side in the radial direction is formed at the center portion in the circumferential direction of the bridge portion 24. The induction pole 25 is preferably disposed on each q axis (see FIG. 6) between the outer teeth 21 adjacent in the circumferential direction.

  The induction pole 25 extends from the bridge portion 24 to a predetermined position inside the outer surface (outer peripheral surface) in the radial direction of the outer rotor 20. A through hole 25b that penetrates the tip 25a in the axial direction is formed in the tip 25a of the guide pole 25.

  The outer teeth 21, the bridge portion 24, and the induction pole 25 described above are integrally formed by, for example, a plurality of electromagnetic steel plates laminated in the axial direction.

  A flange portion 26 is provided on the inner side in the radial direction of the outer teeth 21, that is, on the side facing the inner rotor 30. A radially inner surface (inner peripheral surface) of the flange portion 26 faces an outer peripheral surface of an inner tooth 33 (described later) of the inner rotor 30 through an air gap. A predetermined gap is provided between the flange portions 26 of the outer teeth 21 adjacent to each other in the circumferential direction. This gap is set to a distance at which magnetic flux does not flow between the adjacent flanges 26 even when current is supplied to the field coil 23 and the outer teeth 21 are magnetized.

  For this reason, it can prevent that the armature magnetic flux from the stator 10 which passed the outer teeth 21, and the magnetic flux which generate | occur | produced in the outer teeth 21 flow to the adjacent outer teeth 21 through the collar part 26. Therefore, many armature magnetic fluxes and magnetic fluxes generated by the outer teeth 21 can be linked to the inner rotor 30.

  The induction coil 22 is wound by concentrated winding on the outer side in the radial direction from the bridge portion 24 of the outer teeth 21, that is, on the stator 10 side. The induction pole 25 described above is located between the induction coils 22 wound around the outer teeth 21 adjacent in the circumferential direction. The induction coils 22 that are adjacent to each other in the circumferential direction are wound around the outer teeth 21 so as to form circular windings that are opposite in the circumferential direction.

  The induction coil 22 generates an induction current based on a harmonic component superimposed on the magnetic flux generated on the stator 10 side. Specifically, when a three-phase alternating current is supplied to the armature coil 12 and a rotating magnetic field is generated in the stator 10, the harmonic component magnetic flux generated on the stator 10 side is linked to the induction coil 22. Thereby, the induction coil 22 induces an induced current.

  A lid member 27 is provided outside the induction coil 22 in the radial direction so as to cover the induction coil 22. The lid member 27 is made of, for example, stainless steel and has a plate shape. A radially outer tip 21a of the outer teeth 21 is formed with a groove 21b in which the end of the lid member 27 in the circumferential direction extends on the side surface in the circumferential direction so as to extend in the axial direction. The lid member 27 is held between the adjacent outer teeth 21 by fitting the end in the circumferential direction into the groove 21b from the axial direction.

  As shown in FIG. 3, the lid member 27 is formed with slits 27 a at both ends in the axial direction (vertical direction in FIG. 3) at the substantially center in the circumferential direction when held between the outer teeth 21. A locking portion 27b that protrudes toward the opening end of the slit 27a in the slit 27a is formed at the approximate center in the circumferential direction of the lid member 27. A locking hole 27c is provided at the tip of the locking portion 27b.

  The locking portion 27b and the locking hole 27c are formed so that the locking member 27c and the through hole 25b of the guide pole 25 are secured when the lid member 27 is held between the outer teeth 21 and the locking portion 27b is bent inward in the radial direction. Are formed so as to overlap each other. The cover member 27 is locked at the central portion by inserting a pin through the overlapping locking hole 27c and the through hole 25b in the axial direction. Thereby, the induction coil 22 can be held by the outer rotor 20 so as not to burst due to centrifugal force.

  In FIG. 2, the field coil 23 is wound in a concentrated manner on the inner side in the radial direction from the bridge portion 24 of the outer teeth 21, that is, on the inner rotor 30 side. The field coils 23 adjacent to each other in the circumferential direction are wound around the outer teeth 21 so as to form circular windings in the opposite direction in the circumferential direction. The induction coil 22 and the field coil 23 wound around the same outer tooth 21 are wound around the same direction of winding.

  An alternating current generated in the induction coil 22 is supplied to the field coil 23 after being rectified into a direct current by a rectifier circuit 50 (see FIG. 6) described later.

(Inner rotor)
In FIG. 4, the inner rotor 30 includes a rotor core 31 and an excitation coil 32. FIG. 4 shows a radial cross-sectional view of 90 degrees (1/4) of a mechanical angle of 360 degrees. The rotor core 31 is formed of a magnetic member having a high magnetic permeability, for example, a plurality of electromagnetic steel plates laminated in the axial direction.

  A plurality of inner teeth 33 are formed on the outer side of the rotor core 31 in the radial direction, that is, on the side facing the outer rotor 20. The inner teeth 33 protrude from the rotor core 31 to the outside in the radial direction, and a plurality of inner teeth 33 are formed at equal intervals in the circumferential direction.

  A slot 34 that is a groove-like space is formed between the inner teeth 33 adjacent in the circumferential direction. In the slot 34, excitation coils 32 corresponding to the respective phases of the three-phase alternating current are accommodated.

  As shown in FIG. 5, the exciting coil 32 is three-phase Y-connected. The exciting coil 32 is provided with switches 32a and 32b for switching the three-phase Y connection between a short-circuit connection and an open connection. The switches 32a and 32b are switched so as to be short-circuited when the rotational speed of the inner rotor 30 is high or higher than the predetermined rotational speed, and open when the rotational speed of the inner rotor 30 is lower than the predetermined rotational speed. It is done. As the switches 32a and 32b, for example, a switch that can mechanically switch between the short-circuit connection and the open connection by a centrifugal force generated by the rotation of the inner rotor 30 is used.

(Rectifier circuit)
The rotating electrical machine 1 includes a rectifier circuit 50 that rectifies an alternating induced current induced by the induction coil 22 into a direct current and supplies the direct current to the field coil 23.

  As shown in FIG. 6, the rectifier circuit 50 includes two diodes D1 and D2 as rectifier elements, and is a closed circuit in which the diodes D1 and D2, the two induction coils 22, and the two field coils 23 are connected. It is configured.

  The rectifier circuit 50 is provided in the outer rotor 20 in a state of being housed in a connection board (not shown), for example. The rectifier circuit 50 may be mounted inside the outer rotor 20.

  In the rectifier circuit 50, the AC induced currents generated by the two induction coils 22 are half-wave rectified and full-wave rectified cathodes using the cathode common type neutral point clamp type diode modules of the diodes D1 and D2, respectively. By connecting the side to the field coil 23, the second spatial harmonic can be utilized as a field energy source with high efficiency. The two field coils 23 generate an induced magnetic flux when supplied with a direct current.

(Operation of rotating electrical machine)
In the rotating electrical machine 1 of the present embodiment, the second spatial harmonic in the stationary coordinate system inevitably generated in the stator 10 having the concentrated winding armature coil 12 (the third time harmonic on the fundamental synchronous rotating coordinate). ) Is linked to the induction coil 22 of the outer rotor 20 having a salient pole structure to induce an induced current. The alternating induced current generated in the induction coil 22 is rectified into a direct current by the rectifier circuit 50 and supplied to the field coil 23. The field coil 23 generates an induced magnetic flux when supplied with a direct current.

  For this reason, the rotating electrical machine 1 can utilize the reluctance torque due to the rotating magnetic field of the stator 10 and the self-excited electromagnet torque due to the field coil 23. Further, the permanent magnet can be eliminated, and the cost can be reduced.

  In addition, since the magnetic path of the outer rotor 20 is an open magnetic path (hereinafter also referred to as “open magnetic path”), the armature of the armature coil 12 of the stator 10 is connected to the excitation coil 32 disposed in the inner rotor 30. The magnetic flux and the field magnetic flux generated by the field coil 23 of the outer rotor 20 are easily linked.

  In the inner rotor 30, the rotating magnetic field of the armature magnetic flux of the armature coil 12 that rotates at the fundamental frequency via the outer rotor 20 that is an open magnetic path and the field magnetic flux of the field coil 23 are linked. Becomes an excitation source. By sliding with respect to the rotating magnetic field of the excitation source (the inner rotor 30 rotates slower or faster than the rotating magnetic field), an induced current is generated in the exciting coil 32 of the inner rotor 30, and torque is generated in the inner rotor 30.

  When the inner rotor 30 rotates faster than the fundamental wave rotating magnetic field (that is, slip negative), regenerative torque is generated in the inner rotor 30 and power running torque is generated as reaction torque in the outer rotor 20. Thus, the outer rotor 20 can obtain electromagnetic torque generated by electromagnetic coupling between the inner rotor 30 and the outer rotor 20 in addition to torque generated by the armature magnetic flux generated by the armature coil 12.

  Conventionally, the permanent magnet included in the rotor is an excitation source, and it has been difficult to change the excitation magnetomotive force. However, in this embodiment, the armature magnetic flux is changed (that is, the current flowing through the armature coil 12). The excitation magnetic flux of the inner rotor 30 can be changed. For this reason, it is not necessary to pass a current through the exciting coil 32 of the inner rotor 30 to obtain variable speed characteristics, the system can be simplified, and high torque is output while ensuring robustness and ease of maintenance. Can be made.

  Conventionally, the harmonic copper loss has occurred due to the linkage of the harmonic magnetic flux to the exciting coil 32 of the inner rotor 30, but the harmonics are instantaneously generated by self-excitation by the rectifier circuit 50. The harmonics that cancel out and interlink with the inner rotor 30 can be reduced.

  Further, since the outer rotor 20 is an open magnetic path, a gap is provided between the flange portions 26 of the outer teeth 21, and the bridge portion 24 having the minimum width is provided for the purpose of improving the mechanical strength. While reducing the magnetic resistance, the parallel magnetic resistance applied in the circumferential direction can be increased, and the amount of magnetic flux linked to the inner rotor 30 can be increased.

  As shown in FIG. 7, in the rotating electrical machine 1 of the present embodiment, it can be seen that the armature magnetic flux of the stator 10 is linked to the exciting coil 32 of the inner rotor 30 through the outer teeth 21.

  Thus, since the parallel magnetic resistance of the outer rotor 20 is maximized and the series magnetic resistance is minimized, the torque of the outer rotor 20 can be increased while preventing a decrease in the amount of electromagnetic coupling.

  In addition, since the induction pole 25 is provided in the central portion (q-axis) of the bridge portion 24, the second-order spatial harmonics are interlinked with the induction coil 22, and self-excitation by the second-order spatial harmonics is performed. The amount can be increased.

  As shown in FIG. 8, in the rotating electrical machine 1 of this example, it can be seen that the induction pole 25 causes many second-order spatial harmonics to be linked to the induction coil 22.

(Comparison with conventional rotating electrical machines)
In FIG. 12, a conventional rotating electric machine 100 includes a stator 110 in which an armature coil 112 is wound around a plurality of stator teeth 113 projecting inward in the radial direction, a permanent magnet 121 disposed radially outside, and a radial direction. The magnet rotor 120 includes a permanent magnet 122 disposed on the inner side thereof, and the induction rotor 130 in which an exciting coil 132 is wound around a rotor tooth 133 protruding outward in the radial direction.

  The magnet rotor 120 (PM) of the conventional rotating electrical machine 100 as shown in FIG. 12 is rotated at 1000 r / min, and the induction rotor 130 (IM) is 1000 r / min (slip s = 0), 2000 r / min (slip s = -1) FIG. 13 shows current phase torque characteristics of the magnet rotor 120 (PM) and the induction rotor 130 (IM) when driven at 3000 r / min (slip s = −2).

  As shown in FIG. 13, it can be confirmed that the reaction torque acts on the magnet rotor 120 and the torque is increased because the induction rotor 130 rotates in a slipping negative state and generates regenerative torque. The electromagnetic coupling with the magnet rotor 120 is weak and sufficient torque cannot be transmitted.

  14, a conventional rotating electric machine 200 includes a stator 110 similar to that in FIG. 12, a magnet rotor 220 in which the permanent magnet 122 of the magnet rotor 120 in FIG. And an induction rotor 230 in which an exciting coil 232 is wound around a rotor tooth 233 projecting from the rotor tooth 233. FIG. 14 shows a radial cross-sectional view of 45 degrees (1/8) of the mechanical angle of 360 degrees.

  FIG. 15 shows current phase torque characteristics of the magnet rotor 220 (PM) and the induction rotor 230 (IM) of the rotating electrical machine 200 in which permanent magnets are further layered to solve the problem of a large amount of magnets.

  As shown in FIG. 15, when the permanent magnet is further layered, the amount of magnetic flux linked to the induction rotor 230 is greatly reduced, and the electromagnetic coupling force between the induction rotor 230 and the magnet rotor 220 is further reduced. The regenerative torque decreases. For comparison, it is designed with the same volume as the rotating electrical machine 2 shown in FIG. 12, the inner diameter can be increased due to the further permanent magnet of the magnet rotor 220, and the outer diameter of the induction rotor 230 is increased. . The outer diameter of the stator 110 is common.

  FIG. 9 is a graph showing the current phase torque characteristics of this example. In FIG. 9, in the part surrounded by the square on the right side, the line described as “WF 500 r / min” indicates that the outer rotor 20 (WF) is 500 r / min and the inner rotor 30 (IM) is 1000 r / min. It is a characteristic when rotated in the same direction.

  Similarly, a line described as “WF 1000 r / min” is a characteristic when the outer rotor 20 is rotated in the same direction at 1000 r / min and the inner rotor 30 is rotated in the same direction at 2000 r / min. The line described as “WF 2000 r / min” is a characteristic when the outer rotor 20 is rotated in the same direction at 2000 r / min and the inner rotor 30 is rotated in the same direction at 4000 r / min. The line described as “WF 3000 r / min” is a characteristic when the outer rotor 20 is rotated in the same direction at 3000 r / min and the inner rotor 30 is rotated in the same direction at 5000 r / min.

  As described above, since the outer rotor 20 has an open magnetic path, the armature magnetic flux of the stator 10 is interlinked with the inner rotor 30, thereby increasing the regenerative torque of the inner rotor 30. It can be seen that the torque of the outer rotor 20 is greatly increased as the regenerative torque of the inner rotor 30 is increased.

  In addition, the current phase torque characteristics of the present embodiment shown in FIG. 9 are compared when the rotating electrical machine 1 of the present embodiment is designed with the same stator outer diameter as the conventional rotating electrical machine of FIGS. 12 and 14 for comparison. It is a result.

(Hybrid drive system using the rotating electrical machine of this embodiment)
In FIG. 10, the rotating electrical machine 1 constitutes a hybrid drive system 8 together with an engine 2, a battery 3, an inverter 4, and a drive shaft 5.

  The output shaft 30 </ b> A of the inner rotor 30 is connected to the engine 2 via the clutch 6. The clutch 6 has a transmission state in which rotation of the crankshaft of the engine 2 is transmitted to the output shaft 30A of the inner rotor 30, and a cutoff state in which transmission of rotation from the crankshaft of the engine 2 to the output shaft 30A of the inner rotor 30 is blocked. , Can be switched between.

  The inner rotor 30 rotates integrally with the crankshaft of the engine 2 when the clutch 6 is in the transmission state.

  A disc brake 7 is provided on the output shaft 30 </ b> A of the inner rotor 30. The disc brake 7 applies a mechanical braking force to the output shaft 30 </ b> A of the inner rotor 30.

  An output shaft 20 </ b> A of the outer rotor 20 is connected to the drive shaft 5, and the outer rotor 20 rotates integrally with the drive shaft 5.

  The battery 3 is a secondary battery and is connected to the inverter 4. The inverter 4 is connected to the armature coil 12 of the stator 10. The inverter 4 converts the DC power extracted from the battery 3 into power of a three-phase AC current, and supplies the power of the three-phase AC current to the armature coil 12.

  In such a hybrid drive system 8, by rotating the engine 2 at a speed faster than the fundamental wave rotating magnetic field excited in the stator 10, the mechanical energy of the engine 2 can be transmitted to the drive shaft 5 by electromagnetic coupling. Become.

  In this hybrid drive system 8, in the EV mode in which the engine 2 is stopped and the inner rotor 30 is not rotated, the excitation coil 32 of the inner rotor 30 is controlled to be opened, so that no braking torque is generated and high efficiency is achieved. A simple hybrid drive system can be constructed.

  As shown in FIG. 11, in the rotating electrical machine 1 of the present embodiment, the rotating magnetic field of the stator 10, the outer rotor 20, and the drive shaft 5 rotate synchronously. In the HEV mode in which the engine 2 is driven, the inner rotor 30 is rotated by the engine 2 faster than the rotating magnetic field of the stator 10 and the rotation of the outer rotor 20. Thereby, regenerative torque is generated in the inner rotor 30, and power running torque is generated as a reaction torque in the outer rotor 20, and the torque of the outer rotor 20 can be increased.

  In the EV mode, the inner rotor 30 is controlled so that, for example, the clutch 6 is disengaged, is braked by the disc brake 7, and does not rotate.

  In this embodiment, the rotary electric machine 1 is applied to a radial gap type rotary electric machine, but may be applied to an axial gap type rotary electric machine.

  Further, a stator is disposed on the radially inner side, a first rotor having an induction coil and a field coil is disposed on the radially outer side of the stator, and an excitation coil is disposed on the radially outer side of the first rotor. Alternatively, the second rotor may be arranged.

  Further, the current flowing through the armature coil 12 of the stator 10 is not limited to three phases, and may be multiphase. Alternatively, secondary excitation may be performed by passing a current through the excitation coil 32. The exciting coil 32 is preferably a three-phase Y-connection, but may have a cage rotor structure.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

DESCRIPTION OF SYMBOLS 1 Rotating electric machine 10 Stator 12 Armature coil 13 Stator teeth 20 Outer rotor 21 Outer teeth 22 Inductive coil 23 Field coil 24 Bridge part 25 Inductive pole 26 Gutter part 27 Lid member 27b Locking part 30 Inner rotor 32 Excitation coil 33 Inner teeth 34 slots 50 rectifier circuit

Claims (6)

A stator having concentrated winding armature coils for generating armature magnetic flux;
An outer rotor that is disposed radially inward of the stator and rotates by passage of the armature magnetic flux;
An inner rotor disposed on the inner side in the radial direction than the outer rotor,
The outer rotor includes a plurality of outer coils each wound with an induction coil that induces an induction current based on a harmonic component of a magnetic flux generated by the armature coil and a field coil that generates a magnetic field by energization of the induction current. Have teeth,
The inner rotor is a rotating electric machine having a plurality of inner teeth around which an exciting coil is wound by exciting the armature magnetic flux passing through the outer teeth and the magnetic flux generated by the field coil.   2. The rotating electrical machine according to claim 1, wherein a flange portion that is opposed to a radially outer peripheral surface of the inner rotor via a predetermined gap is formed on the outer teeth on the radially inner side.   The rotating electrical machine according to claim 1 or 2, wherein the induction coil is wound on the stator side of the outer teeth, and the field coil is wound on the inner rotor side. The outer rotor has a bridge portion that connects the adjacent outer teeth,
The induction coil is wound around the outer teeth in the radial direction from the bridge portion, and the field coil is wound inside the radial direction from the bridge portion. 4. The rotating electrical machine according to claim 1. The outer rotor has a guide pole extending radially outward at the bridge portion,
The induction pole is a predetermined portion between the induction coil wound around one of the adjacent outer teeth and the induction coil wound around the other, and inside the outer circumferential surface of the outer rotor in the radial direction. The rotating electrical machine according to claim 4, wherein the rotating electrical machine extends to a position. The outer rotor has a lid member that covers the induction coil from the outside in the radial direction,
The rotating electrical machine according to claim 5, wherein the lid member has a locking portion that extends inward in the radial direction and connects to the induction pole.

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