WO2014188505A1

WO2014188505A1 - Rotating electric machine

Info

Publication number: WO2014188505A1
Application number: PCT/JP2013/064029
Authority: WO
Inventors: 野中　剛
Original assignee: 株式会社安川電機
Priority date: 2013-05-21
Filing date: 2013-05-21
Publication date: 2014-11-27
Also published as: JPWO2014188505A1

Abstract

[Problem] To obtain a rotating electric machine both having a large torque and rotating at high speed. [Solution] A rotating electric machine (10) has: a stator (20) equipped with a stator winding (22) and a stator iron core (21); and a rotor (30) equipped with a rotor iron core (31). The rotor iron core (31) includes: permanent magnets (34) provided at respective magnetic poles; field windings (35) provided between the magnetic poles adjacent in a circumferential direction or at the magnetic poles and generating a magnetic flux in a circumferential direction when current is flowed therethrough; and weak magnetic regions (32b) having a magnetism weaker than that of the other region and holding the field windings (35).

Description

Rotating electric machine

The disclosed embodiment relates to a rotating electrical machine.

Patent Document 1 discloses that a rotor includes a rotor magnetic pole formed of an iron core in which a large number of magnetic plates are laminated in the axial direction, a permanent magnet embedded in a substantially central portion in the circumferential direction of the rotor magnetic pole, and a rotor. There is described a rotating electrical machine including an annular field winding provided at the base of a magnetic pole and energized by supplying a field current from the outside.

JP 2007-124755 A

However, the one described in Patent Document 1 is difficult to achieve high-speed rotation because the holding structure for holding the field winding against the centrifugal force is weak. When the radial dimension of the holding structure is increased to eliminate this, the leakage of magnetic flux from the permanent magnet increases and the magnetic flux that contributes to torque generation decreases. It becomes difficult.

The present invention has been made in view of such problems, and an object thereof is to provide a rotating electrical machine capable of achieving both high torque and high speed rotation.

In order to solve the above problems, according to one aspect of the present invention, the rotor core includes: a stator including a stator winding and a stator core; and a rotor including a rotor core. Is applied to a rotating electrical machine including a permanent magnet provided for each magnetic pole, a field winding having a winding iron core, and a composite magnetic material having a ferromagnetic portion and a nonmagnetic portion.

According to the rotating electrical machine of the present invention, both large torque and high speed rotation can be achieved.

It is a longitudinal cross-sectional view showing the whole structure of the rotary electric machine of 1st Embodiment. FIG. 2 is a transverse sectional view taken along a section AA ′ in FIG. 1. It is explanatory drawing at the time of field winding non-energization showing magnetic flux control by a field winding, and explanatory drawing at the time of field winding energization. It is the elements on larger scale of FIG. 1 showing the detailed structure of a non-contact electric power feeder. It is a circuit diagram showing the rectifier circuit which rectifies the alternating current high voltage which generate | occur | produced in the secondary winding of the non-contact electric power feeder. It is a cross-sectional view showing the rotor provided in the rotary electric machine of 2nd Embodiment. It is explanatory drawing at the time of the deenergization of a field winding showing magnetic flux control by a field winding, and explanatory drawing at the time of energization of a field winding.

Hereinafter, embodiments of the disclosure will be described with reference to the drawings.

<First Embodiment>
The rotating electrical machine according to the first embodiment will be described with reference to FIGS.

<Overall configuration of rotating electrical machine>
First, the whole structure of the rotary electric machine 10 of 1st Embodiment is demonstrated. 1 and 2, the rotating electrical machine 10 is a so-called variable field rotating electrical machine whose characteristics are changed by energization of windings (details will be described later), and includes a cylindrical frame 9. The radial direction (vertical direction in FIG. 1) of the frame 9 is hereinafter simply referred to as “radial direction”, and the axial direction (horizontal direction in FIG. 1) of the frame 9 is hereinafter simply referred to as “axial direction”. The circumferential direction is hereinafter simply referred to as “circumferential direction”.

The rotating electrical machine 10 is an inner rotor type electric motor including a stator 20 provided on the inner side in the radial direction of the frame 9 and a cylindrical rotor 30 provided on the inner side in the radial direction of the stator 20. . The rotating electrical machine 10 also includes a counter load side bracket 11 that closes an opening on one side (left side in FIG. 1) of the frame 9 and a load that closes an opening on the other side (right side in FIG. 1) of the frame 9. The side bracket 12 and a cylindrical non-contact power feeding device 50 provided inside the rotor 30 are provided.

The rotor 30 is provided on the rotating shaft 8 extending in the axial direction. The rotating shaft 8 includes a hollow cylindrical portion 8a that can accommodate the non-contact power feeding device 50 radially inward, and an anti-load side shaft that is integrally provided on one axial side (left side in FIG. 1) of the cylindrical portion 8a. A portion 8b and a load-side shaft portion 8c provided integrally on the other axial side of the cylindrical portion 8a (the right side in FIG. 1).

The outer peripheral surface of the anti-load side shaft portion 8b is rotatably supported by the anti-load side bracket 11 via a bearing 7a. The anti-load side bracket 11 is provided with a lid portion 6 for accommodating the anti-load side shaft portion 8b of the rotary shaft 8. The outer peripheral surface of the load side shaft portion 8c is rotatably supported by the load side bracket 12 via a bearing 7b. Further, the inner peripheral surface of one end (left side in FIG. 1) in the axial direction of the cylindrical portion 8a is rotatably supported by a hollow support shaft 51 of the non-contact power feeding device 50 via a bearing 52a. The inner peripheral surface of the end portion on the other axial side (right side in FIG. 1) of the cylindrical portion 8a is rotatably supported by the support shaft 51 via a bearing 52b.

The stator 20 includes a stator core 21 provided on the inner peripheral surface of the frame 9, and a plurality (12 in this example) of stator windings 22 arranged in the circumferential direction of the stator core 21. I have. The stator iron core 21 is fixed between the half load side bracket 11 and the load side bracket 12 by a plurality of bolts 25 penetrating the outer peripheral edge of the radial direction. A plurality (12 in this example) of teeth 23 penetrating in the axial direction are arranged on the outer side in the radial direction of the stator core 21 in the circumferential direction. At this time, a slot 24 penetrating in the axial direction is formed between two

adjacent teeth

23, 23. Each stator winding 22 is mounted on a tooth 23 and accommodated in slots 24 on both sides in the circumferential direction of the tooth 23.

<Detailed structure of rotor>
The rotor 30 includes a ring-shaped rotor iron core 31. The rotor core 31 is provided with a plurality of N poles and S poles alternately (10 in this example) along the circumferential direction on the outer side in the radial direction. The rotor core 31 has a permanent magnet 34 and a field winding 35 provided with a winding core 35a.

The permanent magnet 34 is provided at the substantially central portion in the radial direction of the rotor core 31 for each magnetic pole. The field winding 35 is provided between the magnetic poles adjacent to each other in the circumferential direction from the substantially central portion in the radial direction of the rotor core 31 to the radially outer portion. The field winding 35 is provided between two magnetic poles adjacent to each other in the circumferential direction of the rotor core 31, and is wound around the winding core 35a to generate a magnetic flux in the circumferential direction by energization.

The rotor core 31 includes a first iron core 32 on the radially outer side and a second iron core 33 on the radially inner side. The first iron core 32 is disposed opposite to the stator iron core 21 with a magnetic gap in the radial direction. The second iron core 33 is attached to the inner side in the radial direction of the first iron core 32 and to the outer side of the cylindrical portion 8 a of the rotating shaft 8. The first iron core 32 and the second iron core 33 are integrally assembled with the permanent magnet 34 and the field winding 35 interposed therebetween. In the integrated first core 32 and second iron core 33, a first mounting hole 37 and a second mounting hole 38 penetrating in the axial direction are provided.

That is, the first iron core 32 is provided with a recess that forms a part of the first mounting hole 37, and the second iron core 33 is provided with a recess that forms the remaining part of the first mounting hole 37. When the first iron core 32 and the second iron core 33 are integrated as described above, the first mounting hole 37 is formed by combining the two concave portions. Similarly, the first iron core 32 is provided with a recess that forms a part of the second mounting hole 38, and the second iron core 33 is provided with a recess that forms the remaining part of the second mounting hole 38. And when the said 1st iron core 32 and the 2nd iron core 33 are united as mentioned above, the 2nd mounting hole 37 is formed because those two recessed parts unite | combine. The permanent magnet 34 is attached to the first mounting hole 37 and the field winding 35 is attached to the second mounting hole 38.

<Magnetic region of the first iron core>
The first iron core 32 includes a ferromagnetic region 32a (corresponding to a ferromagnetic portion) and a weak magnetic region 32b (in this example, a nonmagnetic region, corresponding to a nonmagnetic portion) that is weaker than the ferromagnetic region 32a. The composite magnetic material is provided. The weak magnetic region 32 b is formed in a narrow portion of the first iron core 32 on the radially outer side of the field winding 35, and this narrow portion (that is, the weak magnetic region 32 b) is formed in the field winding 35. (In detail, radially outside the field winding 35) and holds the field winding 35 from the outside in the radial direction. As a result, in this example, the weak magnetic region 32b functions as a holding portion that has weaker magnetism than other portions and holds the field winding 35.

When forming the weak magnetic region 32b in the first iron core 32 in the radially outer region of the field winding 35 (in other words, the radially outer region of the first mounting hole 38, the same applies hereinafter), for example, first, A plate material of a composite magnetic material as a ferromagnetic material is processed into a shape corresponding to the first iron core 32 and laminated. Thereafter, the laminate is inserted into, for example, a high-temperature gas furnace (not shown), and a high-temperature flame is passed through the first mounting hole 38 for the field winding 35 and heated to about 1200 ° C. Thereafter, the magnetism is lost by quenching by natural cooling using heat diffusion. Thus, the field winding of the first iron core 32 is left in the first iron core 32 of the ferromagnetic composite magnetic material other than the outer region in the radial direction of the field winding 35 as the ferromagnetic region 32a. The radially outer region 35 can be the weak magnetic region 32b.

For example, by using the above-described technique, both a ferromagnetic property and a weak magnetic property can be realized while using a composite magnetic material having a single composition, and the first core 32 of the rotor core 31 has a ferromagnetic region. 32a and the weak magnetic region 32b can be formed. In addition, as a method of heating to about 1200 ° C., other methods such as induction overheating are also appropriately used.

<Excitation control of field winding>
In the rotating electrical machine 10 of the present embodiment, control for obtaining a large torque and control for obtaining high-speed rotation are switched depending on whether or not the field winding 35 is energized. Excitation control of the field winding 35 will be described with reference to FIGS. 3 (a) and 3 (b).

<Behavior when field winding is not energized>
FIG. 3A shows magnetic fluxes formed by the permanent magnets 34 of the rotor core 31 when the field winding 35 is not energized (that is, at the normal time when the high-speed rotation is performed). As shown in FIG. 3A and FIG. 1 described above, when the field winding 35 is not energized, the permanent magnet 34 disposed corresponding to the N-pole magnetic pole (see FIG. 2) of the rotor core 31. Magnetic flux (hereinafter referred to as “gap magnetic flux”) B emitted from the N pole forms a magnetic circuit that contributes to torque generation. In other words, the gap magnetic flux B causes the first iron core 32, the gap between the rotor 30 and the stator 20, and the teeth 23 of the rotor 30 to be radially outward from the N pole of the permanent magnet 34. After crossing, it goes around to another tooth 23 adjacent in the circumferential direction. Then, the gap magnetic flux B crosses the tooth 23 inward in the radial direction, and is another permanent magnet arranged corresponding to the S pole (see FIG. 1) adjacent to the N pole of the rotor core 31. After reaching the S pole of 34 and exiting from the N pole of the other permanent magnet 34, the S pole of the original permanent magnet 34 is returned.

Further, a part (hereinafter referred to as “leakage magnetic flux”) Q of the magnetic flux emitted from the N pole of the permanent magnet 34 arranged corresponding to the N pole magnetic pole (see FIG. 2) of the rotor core 31 is A magnetic circuit (leakage magnetic circuit) different from the magnetic circuit of the gap magnetic flux B described above is formed. That is, as shown in FIG. 3A, the magnetic flux Q passes from the north pole of the permanent magnet 34 through the winding core 35a while traversing the first iron core 32 in the circumferential direction, and then the rotor. After reaching the south pole of another permanent magnet 34 arranged corresponding to the south pole of the iron core 31 adjacent to the north pole (see FIG. 1) and coming out of the north pole of the other permanent magnet 34 Return to the S pole of the original permanent magnet 34. Due to the generation of the leakage magnetic flux Q, the magnetic flux density of the gap magnetic flux B is reduced when the field winding 35 is not energized (that is, at normal time).

<Behavior when field winding is energized>
FIG. 3B shows the magnetic flux formed by the permanent magnet 34 of the rotor core 31 when the field winding 35 is energized. Since the field winding 35 has a function of generating a magnetic flux in the circumferential direction when energized, when the field winding 35 is excited by energization, the direction of the leakage flux Q is opposite to that when passing through the winding core 35a. A magnetic flux P is generated. In other words, the field winding 35 is excited so as to block the leakage flux Q. As a result, the gap magnetic flux B is prevented from being lowered due to the generation of the leakage magnetic flux Q as described above with reference to FIG. When energization is further increased, as shown in FIG. 3 (b), the winding core is applied to the gap magnetic flux B from the N pole of the permanent magnet 34 to the first iron core 32 radially outward as described above. Since the magnetic flux P after passing through 35a is also added, the magnetic flux contributing to torque generation can be increased (in other words, the gap magnetic flux B can be increased).

As a result, in the rotating electrical machine 10 of the present embodiment, when it is desired to obtain a large torque characteristic, the field winding 35 is energized to obtain the magnetic flux generation mode shown in FIG. In this case, the field winding 35 is set in a non-energized state so that the magnetic flux is generated as shown in FIG.

<Non-contact power feeding device>
Next, the configuration of the non-contact power feeding device 50 used for energizing the field winding 35 will be described with reference to FIG. In FIG. 4, as described above, the non-contact power feeding device 50 includes the hollow support shaft 51. The support shaft 51 is fixed to the stator 20 with an end portion on one side in the axial direction (left side in FIG. 4) attached to the lid portion 6 (see FIG. 1). The support shaft 51 attached to the lid portion 6 extends in the rotary shaft 8 from the anti-load side shaft portion 8b to the end surface portion on the other axial side (right side in FIG. 4) of the cylindrical portion 8a.

An insulating bracket 55 having three annular grooves 55a along the axial direction is attached to the outer peripheral surface of the support shaft 51. In the annular groove 55a of the bracket 55, primary windings 54 of U-phase, V-phase, and W-phase are wound around the axial direction. Correspondingly, an insulating bracket 57 having three annular grooves 57a is attached to the inner peripheral surface of the cylindrical portion 8a of the rotating shaft 8 along the axial direction. In the annular groove 57 a of the bracket 57, the U phase, V, and V are arranged along the axial direction so as to be radially outside the primary winding 54 of each phase of the U phase, V phase, and W phase. A secondary winding 56 of each phase of the phase and the W phase is wound. At this time, the secondary winding 56 of each phase is provided so as to face the corresponding primary winding 54 with a predetermined gap in the radial direction.

Each primary winding 54 is connected to a three-phase AC power source (not shown) on the stator 20 side via a lead wire (not shown) passing through the hollow portion 51a of the support shaft 51. The AC high voltage of each phase is induced in the secondary winding 56 of each phase by the high voltage of the three-phase AC supplied from the three-phase AC power source to the primary winding 54. The AC high voltage induced in the secondary winding 56 of each phase is rectified by a rectifier circuit 60 in which two

diodes

58 and 58 connected in series are connected in parallel for three phases as shown in FIG. , And supplied to the field winding 35 via the load resistance Z. For example, as shown in FIG. 4, the rectifier circuit 60 is provided at an end portion on one axial side (the left side in FIG. 4) of the cylindrical portion 8 a of the rotating shaft 8.

<Effects of First Embodiment>
As described above, in the rotating electrical machine 10 of the present embodiment, the rotor core 31 is provided with the weak magnetic region 32b. The weak magnetic region 32 b has a function of holding the field winding 35 in the vicinity of the field winding 35. Thereby, the field winding 35 can be firmly held against the centrifugal force, so that high speed rotation can be achieved. Here, if the holding part that holds the field winding 35 has the same magnetism as other parts, the magnetic flux from the permanent magnet 34 passes through the holding part, and the leakage of the magnetic flux increases. To do. In the present embodiment, since the weak magnetic region 32b has weaker magnetism than other parts, the above-described adverse effects can be avoided and leakage of magnetic flux can be suppressed. As a result, as described above with reference to FIG. 3B, the magnetic flux contributing to the torque generation at the low speed can be secured, and the torque can be increased. As described above, according to the present embodiment, both large torque and high-speed rotation can be achieved.

In the present embodiment, in particular, the weak magnetic region 32b is provided on the radially outer side of the field winding 35, and holds the field winding 35 from the radially outer side. Thereby, even when a large centrifugal force is applied to the field winding 35 during high-speed rotation, the field winding 35 can be reliably held from the outside in the radial direction.

In this embodiment, in particular, the rotor core 31 is made of a composite magnetic material having a ferromagnetic region 32a and a weak magnetic region 32b, and the weak magnetic region 32b functions as the above-described holding portion. Thereby, in the rotor core 31 using the common single member, the weak magnetic area | region 32b provided with the magnetism weaker than another site | part can be implement | achieved easily.

In this embodiment, in particular, the rotor core 31 includes an outer first iron core 32 and an inner second iron core 33 provided with a permanent magnet 34 and a field winding 35 interposed therebetween. . Thereby, after assembling the inner second iron core 33 and the outer first iron core 32 first, the field winding 35 with the winding iron core is later connected to the first iron core 32 and the second iron core 33. Can be incorporated in between. As a result, the assembly workability at the time of manufacture can be improved. At that time, by enclosing the outside of the field winding 35, which is a separate member to be assembled later as described above, with the first iron core 32, the field winding 35 is centrifuged even during high-speed rotation. Can be held against force.

Further, particularly in the present embodiment, the weak magnetic region 32 b is provided in the radially outer portion of the field winding 35 in the first iron core 32. The weak magnetic region 32b provided in the first iron core 32 that surrounds the outside of the field winding 35 can reliably hold the field winding 35 against centrifugal force even during high-speed rotation. .

In this embodiment, particularly, the field winding 35 is excited so that the leakage magnetic flux Q passing through the permanent magnet 34 and the winding iron core 35a when not energized is interrupted when energized. That is, in the present embodiment, the field winding 35 is deenergized during high-speed rotation so that the leakage magnetic flux Q passes through the permanent magnet 34 and the winding iron core 35a, thereby realizing high-speed rotation. At a low speed, a large torque can be achieved by energizing and exciting the field winding 35 to interrupt the leakage flux Q.

Second Embodiment
The configuration of the rotating electrical machine of the second embodiment will be described with reference to FIGS. 6 and 7. In each figure, the same reference numerals are given to the same parts as those in the first embodiment, and the description will be omitted or simplified as appropriate. The rotating electrical machine of the present embodiment is provided with a cylindrical stator (not shown) similar to the stator 20 of the first embodiment and a magnetic air gap inside the stator in the radial direction. A cylindrical rotor 30A.

<Detailed structure of rotor>
The rotor 30A includes a ring-shaped rotor core 31A. The rotor core 31A is provided with a plurality of N poles and S poles alternately (10 in this example) along the circumferential direction on the outer side in the radial direction. The rotor core 31A has the same permanent magnets 34 and field windings 65 as those in the first embodiment, which are provided on the substantially outer side in the radial direction of the rotor core 31A for each magnetic pole.

The rotor core 31 </ b> A includes an outer first iron core 32 and an inner second iron core 33. On the outer side in the radial direction of the second iron core 33, a plurality of (in this example, ten) teeth 33a penetrating in the axial direction are arranged in the circumferential direction. A slot 33b penetrating in the axial direction is formed between two

adjacent teeth

33a and 33a. Each field winding 65 is wound around the teeth 33a so as to generate a magnetic flux in the circumferential direction when energized, and is accommodated in the slots 33b on both sides of the teeth 33a. The gap between the opposing linear portions of the field winding 65 of the teeth 33a on both sides accommodated in the slot 33b is filled with the mold resin 61. The first iron core 32 and the second iron core 33 are provided so as to sandwich the permanent magnet 34 and the field winding 65 therebetween. The field winding 65 is provided on the magnetic pole in the rotor core 31A, and generates a magnetic flux in the radial direction when energized.
<Magnetic region of the first iron core>
As in the first embodiment, the first iron core 32 includes a ferromagnetic region 32a (corresponding to a ferromagnetic portion) and a weak magnetic region 32b (in this example, a nonmagnetic region, which is weaker than the ferromagnetic region 32a). And a composite magnetic material. The weak magnetic region 32b is provided in the first iron core 32 in the vicinity of the field winding 65 (specifically, the outer side in the radial direction of the field winding 65), and holds the field winding 65 from the outer side in the radial direction. . As a result, in this example, the weak magnetic region 32b functions as a holding portion that has weaker magnetism than other portions and holds the field winding 65.

The weak magnetic region 32b can be formed by partially heat-treating the first iron core 32 of the ferromagnetic composite magnetic material, as in the first embodiment.

<Excitation control of field winding>
In the rotating electrical machine of the present embodiment, as in the first embodiment, control for obtaining a large torque and control for obtaining high-speed rotation are switched depending on whether or not the field winding 65 is energized. Excitation control of the field winding 65 will be described with reference to FIGS. 7 (a) and 7 (b).

<Behavior when field winding is not energized>
The magnetic flux formed by the permanent magnet 34 of the rotor core 31A when the field winding 65 is not energized (that is, at the normal time when the high-speed rotation is performed) is as shown in FIG. 7A and FIG. In addition, the gap magnetic flux B similar to that in the first embodiment, which comes out of the N pole of the permanent magnet 34 arranged corresponding to the N pole of the rotor core 31A (see FIG. 6), contributes to torque generation. A magnetic circuit is formed. That is, the gap magnetic flux B is generated from the N pole of the permanent magnet 34 to the first iron core 32, the gap between the rotor 30 and the stator 20, and the teeth 23 of the rotor 30 (see FIG. 2 described above). , Respectively, and then wrap around to another tooth 23 adjacent in the circumferential direction. The gap magnetic flux B crosses the tooth 23 inward in the radial direction, and is another permanent magnet disposed corresponding to the S pole (see FIG. 6) adjacent to the N pole of the rotor core 31A. To 34 S poles. Then, after coming out of the N pole of the other permanent magnet 34, the teeth 33a of the rotor core 31A located on the radially inner side of the other permanent magnet are passed through the proximal end portion on the radially inner side of the teeth 33a. Then, it wraps around the teeth 33a corresponding to the original permanent magnet 34 adjacent in the circumferential direction. Then, the wrapping gap magnetic flux B returns to the S pole of the original permanent magnet. That is, in this rotor core 31A, the magnetic flux emitted from the N pole of the permanent magnet 34 does not cross the first iron core 32 in the circumferential direction as in the first embodiment, and the aforementioned leakage magnetic flux does not occur. .

<Behavior when field winding is energized>
FIG. 7B shows the magnetic flux formed by the permanent magnet 34 of the rotor core 31A when the field winding 65 is energized. As shown in FIG. 7B, the field winding 65 has a function of generating a magnetic flux in the radial direction when energized. Therefore, when the field winding 65 is energized by energization, the non-description of FIG. A magnetic flux P ′ is generated in the same direction as the gap magnetic flux B, which is directed from the permanent magnet 34 toward the stator 20 along the radial direction when energized. In other words, the gap magnetic flux B can be increased by applying the magnetic flux P ′.

That is, in the rotating electrical machine of the present embodiment, as in the first embodiment, when it is desired to obtain a large torque characteristic, the field winding 65 is energized to obtain the magnetic flux generation mode of FIG. When it is desired to obtain the above characteristics, the field winding 65 is set in a non-energized state and the magnetic flux generation mode shown in FIG.

In the second embodiment described above, the same effect as that of the first embodiment is obtained. In particular, energizing and exciting the field winding 65 at low speed increases the magnetic flux contributing to torque generation from the permanent magnet 34 toward the stator 20 (referred to as gap magnetic flux B + magnetic flux P ′). Torque can be achieved. As a result, the permanent magnet 34 at the time of non-energization is not wasted unlike the method of the first embodiment in which the leakage magnetic flux generated at the time of de-energization is interrupted at the time of energization to increase the torque.

In the above description, the case where the rotating electrical machine 10 is an inner rotor type in which the

rotors

30 and 30A are provided inside the stator 20 has been described as an example. However, an outer rotor type in which the rotor is provided outside the stator. The present invention can also be applied to other rotating electric machines. Furthermore, although the case where the rotary electric machine 10 is an electric motor has been described as an example, the present invention can also be applied to the case where the rotary electric machine 10 is a generator.

In addition to those already described above, the methods according to the above embodiments and modifications may be used in appropriate combination.

In addition, although not illustrated one by one, the above-described embodiments and modifications are implemented with various modifications without departing from the spirit thereof.

DESCRIPTION OF SYMBOLS 8 Rotating shaft 8a Cylindrical part 10 Rotating electric machine 20 Stator 21 Stator iron core 22 Stator winding 30 Rotor 30A Rotor 31 Rotor iron core 31A Rotor iron core 32 1st iron core 32a Ferromagnetic area 32b Weak magnetic area 33 2nd Iron core 33a Teeth 34 Permanent magnet 35 Field winding 35a Winding iron core 50 Non-contact power feeding device 54 Primary winding 56 Secondary winding

Claims

A stator with a stator winding and a stator core;
A rotor with a rotor core;
Have
The rotor core is
A permanent magnet provided for each magnetic pole;
A field winding having a winding core;
A composite magnetic material having a ferromagnetic part and a non-magnetic part;
A rotating electric machine comprising:
The field winding is
Provided between the magnetic poles adjacent to each other in the circumferential direction, or provided on the magnetic pole, to interrupt the leakage magnetic flux by energization,
The nonmagnetic part is
The rotating electrical machine according to claim 1, further comprising a holding portion that holds the field winding.
The holding part is
The rotating electrical machine according to claim 2, wherein the rotating electrical machine is provided outside the field winding in a radial direction and holds the field winding from the outside in the radial direction.
The rotor core is
4. The rotating electrical machine according to claim 3, further comprising an outer first iron core and an inner second iron core provided with the permanent magnet and the field winding interposed therebetween.
The holding part is
5. The rotating electrical machine according to claim 4, wherein the rotating electrical machine is provided in a portion of the first iron core that is radially outward of the field winding.
The field winding is
The rotation according to any one of claims 3 to 5, wherein a leakage magnetic flux that passes through the permanent magnet and the winding core when not energized is excited so as to be interrupted when energized. Electric.
The field winding is
6. The magnetism according to claim 3, wherein a magnetic flux directed from the permanent magnet toward the stator along a radial direction when not energized is excited so as to increase when energized. Rotating electric machine.
8. A non-contact power feeding device comprising a primary winding connected to a stator side and a secondary winding connected to a rotor side. The rotating electric machine according to item 1.