JP6593163B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine.

  In Patent Document 1, a stator core having an armature winding, and a stator core that is rotatably arranged through a gap and is divided into a first rotor and a second rotor in a rotation axis direction. A rotor in which field magnets having different polarities are alternately arranged in the rotation direction, and a magnetic flux variable mechanism that varies the relative rotation axis direction position of the second rotor with respect to the first rotor of the rotor. And a rotating electric machine having a magnetoresistive layer provided through the stator core in the circumferential direction is disclosed.

  In the rotating electrical machine described in Patent Document 1, the relative rotational axis direction position of the second rotor is controlled by a control signal input to the actuator, and the movable portion is moved through the bearing and the stopper. The two rotors are moved to a predetermined position.

  In a state where the second rotor is moved to an arbitrary predetermined position separated from the first rotor in the rotation axis direction, the magnetic flux generated in the rotation axis direction can be blocked by the magnetoresistive layer provided on the stator core. it can. Thereby, the iron loss in the high-speed rotation area | region of a magnetic flux variable type rotary electric machine can be reduced.

JP 2010-246196 A

  However, the rotating electrical machine described in Patent Document 1 requires an actuator that moves the second rotor in the direction of the rotation axis and a control device that controls the actuator. For this reason, the magnetic flux of the permanent magnet cannot be varied with a low-cost configuration.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a rotating electrical machine that can vary the magnetic flux of a permanent magnet with a low-cost configuration.

  In order to achieve the above object, the present invention is a rotating electrical machine including a stator having an armature coil that generates a magnetic flux when energized, and a rotor that rotates by the passage of the magnetic flux. An annular stator core having a plurality of stator teeth arranged at predetermined intervals, and an armature coil wound toroidally between adjacent stator teeth of the annular stator core, wherein the rotor comprises the stator core A rotor core having a first rotor tooth facing the stator teeth on at least one side surface in the axial direction and a second rotor tooth facing the stator teeth on the radially inner surface side of the stator core; It is wound around the first rotor teeth and is induced based on the magnetic flux generated on the stator side. An induction coil for generating a magnetic field member, a permanent magnet disposed in the second rotor teeth, and a magnetic path member disposed around the permanent magnet and guiding a part of the magnetic flux of the permanent magnet, The magnetic path member is provided with a variable field coil capable of adjusting a magnetic flux amount of the magnetic flux guided to the magnetic path member based on an induced current generated in the induction coil.

  ADVANTAGE OF THE INVENTION According to this invention, the rotary electric machine which can vary the magnetic flux of a permanent magnet with a low-cost structure can be provided.

FIG. 1 is a partial cross-sectional perspective view of a rotating electrical machine according to an embodiment of the present invention. FIG. 2 is a perspective view showing the rotating electrical machine according to the embodiment of the present invention, in which the first rotor core is omitted. FIG. 3 is a perspective view of the stator of the rotating electrical machine according to the embodiment of the present invention. FIG. 4 is a partial cross-sectional perspective view of the rotating electrical machine according to the embodiment of the present invention, in which the induction coil and the field coil are omitted. FIG. 5 is a connection diagram of the induction coil, field coil, variable field coil, and rectifier circuit in the rotating electrical machine according to the embodiment of the present invention. FIG. 6 is a schematic diagram showing the amount of magnetic flux interlinked from the rotor to the stator when the rotor of the rotating electrical machine according to the embodiment of the present invention is rotating at a low speed. FIG. 7 is a schematic diagram showing the amount of magnetic flux interlinked from the rotor to the stator when the rotor of the rotating electrical machine according to the embodiment of the present invention is rotating at a high speed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 7 are diagrams illustrating a rotating electrical machine according to an embodiment of the present invention.

  As shown in FIG. 1 and FIG. 2, the rotating electrical machine 1 includes a stator 10 having a three-phase armature coil 11 of W phase, V phase, and U phase that generates magnetic flux when energized, and magnetic flux generated in the stator 10. And a rotor 20 that rotates by passage.

(Stator)
The stator 10 includes an annular stator core 12 made of a magnetic material having a high magnetic permeability, and an armature coil 11 wound around the stator core 12. The stator 10 is fixed in a state of being magnetically cut off to a motor case (not shown) via a connecting piece (not shown) made of a nonmagnetic material provided on the outer peripheral surface of the stator core 12. Thereby, generation | occurrence | production of the leakage magnetic flux etc. are suppressed, for example.

  As shown in FIG. 3, the stator core 12 is formed with a plurality of stator teeth 13 protruding inward in the radial direction at predetermined intervals. Slots 14 that are groove-like spaces are formed between stator teeth 13 that are adjacent in the circumferential direction. In addition, a radial direction shows the direction orthogonal to the direction where the rotating shaft 2 (refer FIG. 6) extends | stretches. The radially inner side indicates the side close to the rotating shaft 2 in the radial direction, and the radially outer side indicates the side far from the rotating shaft 2 in the radial direction.

  The armature coil 11 is toroidally wound in a slot 14 formed between stator teeth 13 adjacent to each other in the circumferential direction of an annular stator core 12. Each of the W-phase, V-phase, and U-phase armature coils 11 is wound around the slot 14 by concentrated winding. Toroidal winding is a method in which the winding of the armature coil 11 is wound around the stator core 12 alternately through the inside and outside of the ring of the stator core 12.

  The armature coil 11 is a rectangular wire having a rectangular cross section, and is wound around the slot 14 in a toroidal winding state by edgewise winding. Edgewise winding is a method of winding a rectangular wire vertically with the short side of the rectangular wire facing the slot 14 inward and outward in the radial direction of the rotating electrical machine 1.

  Thereby, since the rectangular wires adjacent to each other in the winding pitch direction are in surface contact with each other at the long side, the number of turns can be increased while maintaining the cross-sectional area corresponding to the current, so that the space factor of the armature coil 11 can be improved, and the stator 10 magnetomotive force can be increased.

  The stator teeth 13 have side surfaces 13 a on one side and the other side in the axial direction of the stator core 12, and an inner surface 13 b in the radial direction of the stator core 12. A first rotor tooth 212 (to be described later) faces the side surface 13a of the stator tooth 13. A second rotor tooth 222, which will be described later, faces the inner surface 13b of the stator tooth 13. In addition, an axial direction shows the same direction as the direction where the rotating shaft 2 (refer FIG. 6) extends | stretches.

  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 11. Magnetic flux generated in the stator 10 (hereinafter, this magnetic flux is referred to as “main magnetic flux”) is linked to the rotor 20. Thereby, the stator 10 can rotate the rotor 20.

  Specifically, the pair of armature coils 11 that oppose each other in the circumferential direction with the stator teeth 13 interposed therebetween is a magnetic flux generated from one armature coil 11 and a magnetic flux generated from the other armature coil 11. The winding direction and the energization direction are set so that the direction is the opposite direction in the circumferential direction.

  Thus, for example, when one armature coil 11 is in the V + phase and the other armature coil 11 is in the V− phase, the magnetic flux generated from the pair of armature coils 11 is the stator sandwiched between the pair of armature coils 11. This occurs toward the teeth 13 so as to collide with the stator teeth 13. The magnetic flux generated in the stator teeth 13 changes its direction in a direction perpendicular to the circumferential direction of the stator core 12 and travels from the stator teeth 13 to the rotor 20.

  A part of the magnetic flux directed toward the rotor 20 passes through a first rotor core 211 and a second rotor core 221 described later, and is then sandwiched between a pair of armature coils 11 of W + phase and W− phase. Head to 13. Further, the remaining part of the magnetic flux toward the rotor 20 passes through a first rotor core 211 and a second rotor core 221 described later, and is then sandwiched between a pair of armature coils 11 of U + phase and U− phase. Head to Teeth 13.

  Thus, on the surface where the stator teeth 13 and the rotor 20 face each other, a magnetic circuit of magnetic flux generated by the armature coil 11 is configured. The rotating electrical machine 1 rotates the rotor 20 with the surface where the stator teeth 13 and the rotor 20 face each other as a torque generation surface.

  Further, as described above, the stator 10 has the armature coil 11 in a toroidal winding and a concentrated winding. For this reason, when three-phase alternating current is supplied to the armature coil 11, the stator 10 generates a harmonic rotating magnetic field that is asynchronous with the rotation of the rotor 20 in addition to the rotating magnetic field that rotates in synchronization with the rotation of the rotor 20. To do. 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.

(Rotor)
As shown in FIGS. 1 to 4, the rotor 20 includes a pair of axial gap rotors 210 disposed so as to sandwich the stator 10 in the axial direction, and a radial gap disposed on the radially inner side of the stator core 12. And a rotor 220.

  The pair of axial gap rotors 210 and radial gap rotors 220 are fixed so as to rotate integrally with the rotation shaft 2 (see FIG. 6) so as to rotate in synchronization with each other. The pair of axial gap rotors 210 and the radial gap rotor 220 may be integrated.

  The pair of axial gap rotors 210 includes an annular first rotor core 211 made of a magnetic material having a high magnetic permeability, an induction coil 215, and a field coil 216. The first rotor core 211 includes a plurality of first rotor teeth 212 protruding from the first rotor core 211 toward the axial stator 10 side at predetermined intervals along the circumferential direction of the first rotor core 211. Is formed.

  The first rotor teeth 212 are opposed to the stator teeth 13 on both sides in the axial direction of the stator core 12, that is, on one side and the other side in the axial direction of the stator core 12.

  An induction coil 215 and a field coil 216 are wound around the first rotor tooth 212 so as to form a layer in the axial direction. The induction coil 215 and the field coil 216 are each composed of a winding coated with an insulating material.

  The induction coil 215 is disposed closer to the stator 10 than the field coil 216. The induction coil 215 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 11 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 215. Thereby, the induction coil 215 induces an induced current.

  The field coil 216 is disposed closer to the first rotor core 211 than the induction coil 215. The field coil 216 generates a magnetic field when the induced current generated in the induction coil 215 is rectified and supplied.

  Thereby, the 1st rotor teeth 212 can be functioned as an electromagnet, and the surface where stator teeth 13 and the 1st rotor teeth 212 oppose can be functioned as a torque generating surface.

  The radial gap rotor 220 includes a second rotor core 221 made of a magnetic material having a high magnetic permeability and fixed so as to be integrally rotatable with respect to the rotating shaft 2 (see FIG. 6), a permanent magnet 223, and a magnetic path member 225. Have. The first rotor core 211 and the second rotor core 221 constitute a rotor core.

  A plurality of second rotor teeth 222 projecting radially outward from the second rotor core 221 are formed on the second rotor core 221 at predetermined intervals along the circumferential direction of the second rotor core 221. Has been.

  The second rotor teeth 222 are opposed to the stator teeth 13 on the radially inner surface side of the stator core 12. A permanent magnet 223 is disposed on the second rotor teeth 222.

  The permanent magnet 223 is composed of, for example, a neodymium magnet (Nd—Fe—B magnet), and is included in the second rotor teeth 222.

  The magnetic path member 225 guides a part of the magnetic flux of the permanent magnet 223 and is formed in an annular shape around the permanent magnet 223. Specifically, the magnetic path member 225 guides a magnetic flux that leaks in the axial direction of the second rotor core 221 from the permanent magnet 223 out of the magnetic flux generated by the permanent magnet 223 (hereinafter, this magnetic flux is referred to as “leakage magnetic flux”). Is.

  The magnetic path member 225 includes an inner packet part 225 a included in the second rotor tooth 222 together with the permanent magnet 223, and an extending part 225 b extended from the second rotor tooth 222 so as to protrude in the axial direction of the second rotor core 221. And. In the magnetic path member 225, the extending portion 225b is formed in such a shape that a portion of the permanent magnet 223 located on the side surface 223a side in the axial direction extends from the second rotor tooth 222 in the axial direction.

  The inner packet part 225a is arranged on the inner side and the outer side in the radial direction of the permanent magnet 223 so as to sandwich the permanent magnet 223 in the radial direction. The inner packet part 225 a is configured to pass a magnetic flux interlinking from the permanent magnet 223 to the stator 10. The inner packet part 225a is formed of, for example, a dust core in which a fine powder of a ferromagnetic material is compressed and hardened.

  The extending portions 225b correspond to portions extending in the axial direction from the second rotor teeth 222 of the magnetic path member 225, and are provided on both sides of the second rotor teeth 222 in the axial direction via regions of high magnetic resistance. It has been.

  The extending portion 225b is formed in a U shape by a dust core in which a fine powder of a ferromagnetic material is compressed and hardened, for example. The extending portions 225b are arranged so that the end surfaces on the second rotor teeth 222 side face the end surfaces on both sides in the axial direction of the inner packet portions 225a.

  The extending portion 225b is configured separately from the inner packet portion 225a, and is held by the second rotor core 221 or the first rotor core 211 via a connecting member (not shown). Thereby, the inner packet part 225 a and the extending part 225 b are separated in the axial direction of the second rotor core 221.

  In addition, a gap G (see FIG. 6) having a predetermined size is formed between the end surfaces on both sides in the axial direction of the inner packet portion 225a and the end surface on the second rotor teeth 222 side of the extending portion 225b. This gap G is formed as a high magnetic resistance region. The gap G is large so that the leakage magnetic flux of the permanent magnet 223 does not flow from the inner packet part 225a to the extending part 225b when the direct current is not supplied to the variable field coil 226, which will be described later, or even if it flows. In addition, when a direct current is supplied to a variable field coil 226 described later, the leakage magnetic flux of the permanent magnet 223 is set so as to flow from the inner packet part 225a to the extending part 225b.

  A variable field coil 226 is wound around the extending portion 225 b along the circumferential direction of the second rotor core 221. The variable field coil 226 is a leakage flux introduced from the permanent magnet 223 to the magnetic path member 225 according to the magnitude of the induced current generated in the induction coil 215, that is, the leakage of the permanent magnet 223 that shorts the magnetic path member 225. The coil can adjust the amount of magnetic flux.

  The variable field coil 226 has a magnetic flux in the direction in which the leakage magnetic flux of the permanent magnet 223 is guided through the magnetic path member 225, that is, the direction in which the magnetic flux is short-circuited (the direction indicated by the arrow in FIG. 7). Is wound around the extending portion 225b of the magnetic path member 225.

  As a result, the variable field coil 226 generates an induced magnetic flux by being supplied with a direct current rectified by a rectifier circuit 30 described later, and a magnetic path member of a leakage magnetic flux of the permanent magnet 223 as shown in FIG. The short circuit in 225 is assisted. By adjusting the magnetic flux amount of the induced magnetic flux, the magnetic flux amount of the leakage magnetic flux of the permanent magnet 223 that short-circuits the magnetic path member 225 is adjusted.

  The amount of induced magnetic flux increases as the direct current supplied to the variable field coil 226 increases and the number of turns of the variable field coil 226 increases. The number of turns of the variable field coil 226 is set to the number of turns obtained experimentally in advance.

  The direct current supplied to the variable field coil 226 is varied according to the magnitude of the induced current generated in the induction coil 215. Thereby, the magnetic flux amount of the leakage magnetic flux of the permanent magnet 223 that short-circuits the magnetic path member 225 is adjusted according to the magnitude of the induced current generated in the induction coil 215. The induced current generated in the induction coil 215 increases as the rotational speed of the rotor 20 increases. Therefore, the magnetic flux amount of the leakage magnetic flux of the permanent magnet 223 that short-circuits the inside of the magnetic path member 225 increases as the rotor 20 rotational speed increases.

(Rectifier circuit)
The rotating electrical machine 1 also includes a rectifier circuit 30 that rectifies the induced current generated in the induction coil 215 and supplies the rectified current to the variable field coil 226.

  As shown in FIG. 5, the rectifier circuit 30 includes two diodes D1 and D2 as rectifier elements, these diodes D1 and D2, two induction coils 215, two field coils 216, and two variable field coils 226. Are configured as a closed circuit. The rectifier circuit 30 includes one side and the other side in the axial direction of the rotor 20 so as to correspond to the induction coil 215, the field coil 216, and the variable field coil 226 on one side and the other side in the axial direction of the rotor 20, respectively. Are provided respectively.

  The two induction coils 215 in the rectifier circuit 30 are induction coils 215 adjacent in the circumferential direction of the axial gap rotor 210. The two field coils 216 are field coils 216 adjacent to each other in the circumferential direction of the axial gap rotor 210. The two variable field coils 226 are the variable field coils 226 that are adjacent to each other in the circumferential direction of the radial gap rotor 220.

  For example, the diodes D1 and D2 are provided in the axial gap rotor 210 or the radial gap rotor 220 in a state of being housed in a diode case (not shown). The diodes D1 and D2 may be mounted inside the axial gap rotor 210 or the radial gap rotor 220.

  In the rectifier circuit 30, the AC induced current generated in the two induction coils 215 is rectified by the diodes D1 and D2, and the rectified DC current is converted into two field coils 216 and two variable fields connected in series. The magnetic coil 226 is supplied as a field current. The two variable field coils 226 generate an induced magnetic flux when supplied with a direct current.

(Operation of rotating electrical machine)
Next, with reference to FIG.6 and FIG.7, the effect | action of the rotary electric machine 1 which concerns on this Embodiment is demonstrated.

  As described above, rotating electrical machine 1 according to the present embodiment is a permanent magnet type synchronous motor that includes permanent magnet 223 in rotor 20 and outputs torque using the magnetic flux of permanent magnet 223.

  In the conventional permanent magnet type synchronous motor, since the magnetic flux of the permanent magnet is constant, the counter electromotive force generated in the armature coil of the stator is increased by the magnetic flux of the permanent magnet as the rotational speed of the rotor increases. When the rotational speed of the rotor reaches a certain rotational speed, the counter electromotive force generated in the armature coil becomes equal to the power supply voltage of the permanent magnet type synchronous motor. As a result, no more current can flow through the permanent magnet type synchronous motor. As a result, the rotational speed of the rotor cannot be increased.

  Conventionally, in order to solve such problems, field weakening control has been performed in which a counter electromotive force generated in the armature coil is equivalently reduced by passing a current that cancels the magnetic flux generated by the permanent magnet through the armature coil of the stator.

  However, in this field weakening control, current is passed to generate a vector that cancels the magnetic flux of the permanent magnet in the direction of the magnetic flux vector that does not contribute to the torque, so that useless energy is consumed for the output, resulting in a decrease in efficiency. It was.

  Further, in the field weakening control, a harmonic magnetic flux is generated, and therefore the iron loss and electromagnetic vibration of the permanent magnet type synchronous motor may increase due to the harmonic magnetic flux. Further, in the field weakening control, since the magnetic flux in the direction opposite to the magnetic flux of the permanent magnet is generated to suppress the magnetic flux of the permanent magnet, irreversible demagnetization of the permanent magnet may occur. For this reason, it is necessary to use a permanent magnet having a relatively high coercive force, which increases costs.

  Further, when a neodymium magnet is used as the permanent magnet, an eddy current is generated in the permanent magnet due to the fluctuation of the external magnetic field by the field weakening control, and the permanent magnet generates heat. For this reason, there exists a possibility that the irreversible demagnetization of a permanent magnet may arise by heat_generation | fever. Therefore, it is necessary to add a material such as a rare earth having high heat resistance to the permanent magnet. However, in this case, since the added material such as rare earth becomes an impurity for the permanent magnet, the original performance of the permanent magnet may not be exhibited.

  Therefore, in the rotating electrical machine 1 according to the present embodiment, the amount of magnetic flux linked from the permanent magnet 223 to the stator 10 is adjusted by the action of the magnetic path member 225 and the variable field coil 226 described above without performing field weakening control. Possible configuration. Thereby, the rotary electric machine 1 which concerns on this Embodiment can solve the problem by the field weakening control as mentioned above.

(When rotor is running at low speed)
In the rotating electrical machine 1 according to the present embodiment, when the rotational speed of the rotor 20 is low, the magnetic flux of the harmonic component is not generated in the stator 10 or is very small even if it is generated. For this reason, the variable field coil 226 does not generate an induced magnetic flux or a minute amount even if it is generated. Therefore, in the gap G, the magnetic resistance is high.

  As a result, as shown in FIG. 6, the leakage magnetic flux of the permanent magnet 223 does not short-circuit the magnetic path member 225. Thereby, all of the magnetic flux of the permanent magnet 223 is linked to the stator 10.

  Thus, when the rotational speed of the rotor 20 is low, the amount of magnetic flux interlinked from the permanent magnet 223 to the stator 10 can be increased compared to when the rotational speed of the rotor 20 is high.

(At high rotor speed)
On the other hand, when the rotational speed of the rotor 20 is high in the rotating electrical machine 1 according to the present embodiment, a magnetic flux of a harmonic component is generated in the stator 10. The amount of the harmonic component magnetic flux increases as the rotational speed of the rotor 20 increases.

  As a result, an induced current is induced in the induction coil 215 of the axial gap rotor 210, and the induced current is rectified by the rectifier circuit 30 and supplied to the variable field coil 226 as a direct current.

  The variable field coil 226 supplied with the direct current generates an induced magnetic flux in a direction in which the leakage magnetic flux of the permanent magnet 223 shorts the magnetic path member 225. Thereby, the magnetic resistance in the gap G decreases.

  As a result, as shown in FIG. 7, a part of the magnetic flux of the permanent magnet 223 is short-circuited inside the magnetic path member 225 as a leakage magnetic flux. Thereby, the magnetic flux excluding the leakage magnetic flux among the magnetic fluxes of the permanent magnet 223 is linked to the stator 10. That is, the amount of magnetic flux interlinked from the permanent magnet 223 to the stator 10 is suppressed.

  Therefore, even if the rotational speed of the rotor 20 is high, field-weakening control can be made unnecessary. For this reason, the iron loss and electromagnetic vibration resulting from the harmonic magnetic flux produced by field weakening control can be prevented.

  Furthermore, since field-weakening control is not required, it is not necessary to use a permanent magnet having a high coercive force, and it is not necessary to add a material such as a rare earth having a high heat resistance to the permanent magnet. Thereby, the cost of the rotary electric machine 1 can be reduced.

  As described above, in the rotating electrical machine 1 according to the present embodiment, the amount of magnetic flux interlinked from the permanent magnet 223 to the stator 10 can be adjusted without performing field-weakening control. Therefore, when the rotational speed of the rotor 20 is high, the efficiency is improved. A decrease can be prevented. Further, the output can be improved when the rotational speed of the rotor 20 is low.

  As described above, according to the rotating electrical machine 1 of the present embodiment, an induction current is generated in the induction coil 215 of the axial gap rotor 210 based on the harmonic component superimposed on the magnetic flux generated on the stator 10 side. By rectifying the induced current by the rectifier circuit 30 and supplying it to the variable field coil 226, the magnetic flux amount of the leakage magnetic flux of the permanent magnet 223 that short-circuits the magnetic path member 225 can be adjusted.

  The harmonic component superimposed on the magnetic flux generated on the stator 10 side is obtained by supplying three-phase alternating current to the armature coil 11 that is toroidally wound and concentratedly wound on the stator 10. For this reason, in order to generate the direct current supplied to the variable field coil 226, a special device such as a DC / DC converter is not required.

  Thus, the rotating electrical machine 1 of the present embodiment adjusts the amount of magnetic flux interlinked from the permanent magnet 223 to the stator 10 with a simple configuration without using a special device such as a DC / DC converter. be able to. As a result, the rotating electrical machine 1 of the present embodiment can vary the magnetic flux of the permanent magnet 223 with a low-cost configuration.

  The rotating electrical machine 1 can be suitably employed as, for example, a vehicle-mounted motor, a wind power generator, or a machine tool motor.

  In the present embodiment, the first rotor teeth 212 are provided so as to face both axial sides of the stator core 12. However, the present invention is not limited to this, and for example, one side and the other of the stator core 12 in the axial direction. You may provide so that either of the side surfaces may be opposed. In other words, the first rotor teeth 212 may be provided only on one of the side surfaces of the stator core 12 on one side and the other side in the axial direction. In this case, the physique of the rotary electric machine 1 can be made smaller by adopting only the axial gap rotor 210 on one side in the axial direction.

  In this embodiment, the example in which the field coil 216 is provided in the axial gap rotor 210 has been described. However, the axial gap rotor 210 may have a configuration in which only the induction coil 215 is provided. In this case, the axial gap rotor 210 can be made thin in the axial direction, and the size of the rotating electrical machine 1 can be reduced. Further, the configuration of the rectifier circuit 30 can be simplified.

  The rotating electrical machine 1 of the present embodiment can also be applied to a double rotor type rotating electrical machine that includes two rotors, an outer rotor and an inner rotor, on the inner side in the radial direction of the stator. In this case, the armature coil is concentratedly wound around the stator, but toroidal winding is not adopted. Further, in this double rotor type rotating electrical machine, an induction coil is disposed in the outer rotor, and a permanent magnet, a magnetic path member, and a variable field coil are disposed in the inner rotor. Note that the configurations of the outer rotor and the inner rotor described above may be reversed.

  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 electrical machine 2 Rotating shaft 10 Stator 11 Armature coil 12 Stator core 13 Stator teeth 13a Side surface 13b Inner surface 20 Rotor 30 Rectifier circuit 210 Axial gap rotor 211 First rotor core (rotor core)
212 First rotor teeth 215 Inductive coil 216 Field coil 220 Radial gap rotor 221 Second rotor core (rotor core)
222 2nd rotor teeth 223 Permanent magnet 225 Magnetic path member 225a Inner part 225b Extending part 226 Variable field coil D1, D2 Diode

Claims (6)

A rotating electric machine comprising a stator having an armature coil that generates a magnetic flux when energized, and a rotor that rotates by the passage of the magnetic flux,
The stator is
An annular stator core having a plurality of stator teeth arranged at predetermined intervals in the circumferential direction;
An armature coil that is toroidally wound between adjacent stator teeth of the annular stator core, and
The rotor is
A rotor core having a first rotor tooth facing the stator teeth on at least one side surface in the axial direction of the stator core and a second rotor teeth facing the stator teeth on the radially inner surface side of the stator core. When,
An induction coil wound around the first rotor teeth and generating an induction current based on magnetic flux generated on the stator side;
A permanent magnet disposed on the second rotor teeth;
A magnetic path member disposed around the permanent magnet and guiding a part of the magnetic flux of the permanent magnet;
The rotating electric machine according to claim 1, wherein the magnetic path member is provided with a variable field coil capable of adjusting a magnetic flux amount of the magnetic flux guided to the magnetic path member based on an induced current generated in the induction coil. The magnetic path member is formed in an annular shape around the permanent magnet, and a portion located on the side surface in the axial direction of the permanent magnet is extended in the axial direction from the second rotor teeth,
2. The rotating electrical machine according to claim 1, wherein the variable field coil is provided at a portion of the magnetic path member that extends in an axial direction from the second rotor teeth. The magnetic path member includes an inner packet part included in the second rotor teeth, and an extension part extended in the axial direction of the rotor core from the second rotor teeth,
The rotating electrical machine according to claim 2, wherein the inner packet part and the extending part are separated in an axial direction of the rotor core.   4. The rotating electrical machine according to claim 1, wherein the first rotor teeth are provided so as to face the stator teeth on an axial side surface side of the stator core. 5.   5. The field coil for generating a magnetic field when the induction current generated in the induction coil is supplied to the first rotor teeth. 5. The rotating electrical machine described in 1. 6. The rotating electrical machine according to claim 1, further comprising a rectifier circuit that rectifies an induced current generated by the induction coil and supplies the rectified current to the variable field coil.

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