JP2022166339A - Rotary electric machine - Google Patents

Abstract

To provide a technology capable of downsizing a claw pole-type rotary electric machine of a plurality of phases.SOLUTION: A claw pole motor 1 according to one embodiment of the present disclosure comprises a stator 20 in which six claw pole-type stator units 21 are axially laminated. For two axially adjacent stator units 21 having the same phase included in the six stator units 21, mutual claw magnetic poles 211B are arranged in a substantial mirror-image relation; mutual coils 212 are wound in a reverse direction when seen from circuit end parts at a power supply side and a neutral point side; and an axial distance between mutual stator iron cores 211 is smaller than an axial distance between the stator iron cores 211 of two axially adjacent stator units 21 having different phases among the six stator units 21.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to rotating electric machines.

For example, in a multi-phase claw pole motor, there is known a technique of providing a non-magnetic connecting plate between stators of two adjacent phases (see Patent Document 1).

Japanese Patent No. 4887128

However, the size of the claw pole type motor in the axial direction increases by the amount of provision of the connecting plate.

An object of the present disclosure is to provide a technology capable of miniaturizing a multi-phase claw pole type rotating electric machine.

In one embodiment of the present disclosure,
A multi-phase rotating electric machine comprising a stator in which a plurality of claw pole type stator units are stacked in the axial direction,
The stator units include windings that are wound in an annular shape, iron cores that surround the windings, and stator units that are arranged alternately in the circumferential direction at both ends of the iron core in the axial direction. a plurality of claw poles protruding radially toward the rotor from both ends of the iron core in the axial direction;
At least one of the combinations of two axially adjacent stator units of the same phase included in the plurality of stator units has the claw poles arranged in a substantially mirror image relationship with each other, and are wound in opposite directions when viewed from the circuit end on the power supply side and the neutral point side, and the axial distance between the iron cores is the same among the plurality of stator units less than the axial distance between the cores of two stator units of different phases axially adjacent to each other of
A rotating electric machine is provided.

According to this embodiment, even if the axial distance between the two stator units of the same phase is relatively short, the magnetic flux of the claw poles formed in the two facing stator cores is By aligning the directions in substantially the same direction, magnetic flux leakage can be suppressed. Therefore, the motor can be miniaturized.

Also, in another embodiment according to the present disclosure,
A multi-phase rotating electric machine comprising a stator in which a plurality of claw pole type stator units are stacked in the axial direction,
The stator units include windings that are wound in an annular shape, iron cores that surround the windings, and stator units that are arranged alternately in the circumferential direction at both ends of the iron core in the axial direction. a plurality of claw poles protruding radially toward the rotor from both ends of the iron core in the axial direction;
At least one of the combinations of two stator units of the same phase that are adjacent in the axial direction among the plurality of stator units are substantially mirror images of the axial ends facing the cores of each other. The polarities of the magnetic poles due to the armature current of the claw poles arranged in the relationship are the same, and the axial distance between the iron cores of the plurality of stator units is axially adjacent to each other. less than the axial distance between the cores of two stator units of different phases;
A rotating electric machine is provided.

According to this embodiment, even if the axial distance between the two stator units of the same phase is relatively short, the magnetic flux of the claw poles formed in the two facing stator cores is By aligning the directions in substantially the same direction, magnetic flux leakage can be suppressed. Therefore, the motor can be miniaturized.

Also, in the above-described embodiment,
The at least one set may have zero axial distance between the cores.

Also, in the above-described embodiment,
The claw magnetic poles include a first claw magnetic pole portion protruding radially toward the rotor from one end portion in the axial direction of the iron core, and a first claw magnetic pole portion protruding in the axial direction from the tip portion of the first claw magnetic pole portion to the axial direction of the iron core. a second claw magnetic pole portion protruding axially toward the other end;
The at least one pair may be in contact with each other at the tips of the second claw magnetic pole portions.

Also, in the above-described embodiment,
At least one of the combinations of two stator units of the same phase that are adjacent in the axial direction among the plurality of stator units are arranged such that both ends of each of the windings are located on the inner peripheral portion and the outer peripheral portion. , and one ends of the inner peripheral portions of the windings may be connected to each other, or the other ends of the outer peripheral portions of the windings may be connected to each other.

According to the above-described embodiments, it is possible to provide a technology that enables miniaturization of a multi-phase claw pole type rotating electric machine.

It is a perspective view showing an outline of a motor. It is a perspective view which shows an example of a structure of a stator. 4 is an exploded view showing an example of the configuration of a stator unit; FIG. FIG. 5 is an exploded view showing another example of the configuration of the stator unit; FIG. 4 is a perspective view showing an example of the configuration of two adjacent stator units of the same phase; FIG. 4 is a diagram showing an example of a configuration of two windings when two windings corresponding to two adjacent stator units of the same phase are connected in series; FIG. 10 is a diagram showing another example of the configuration of two windings when two windings corresponding to two adjacent stator units of the same phase are connected in series; FIG. 4 is a diagram showing an example of a configuration of two windings when two windings corresponding to two adjacent stator units of the same phase are connected in parallel; FIG. 8 is a diagram showing another example of the configuration of two windings when two windings corresponding to two adjacent stator units of the same phase are connected in parallel;

Embodiments will be described below with reference to the drawings.

[Basic configuration of motor]
First, with reference to FIGS. 1 to 3 (FIGS. 3A and 3B), the basic configuration of a motor 1 according to this embodiment will be described.

FIG. 1 is a perspective view showing an outline of an example of a claw pole motor (hereinafter simply referred to as "motor") 1 according to this embodiment. FIG. 2 is a perspective view showing an example of the configuration of the stator 20 according to this embodiment. Specifically, FIG. 2 is a diagram in which illustration of the rotor 10 (the rotor core 11, the permanent magnets 12, and the rotating shaft member 13) is omitted in FIG. 3A and 3B are exploded views showing one example and another example of the configuration of the stator unit 21, respectively.

As shown in FIG. 1, a motor (also referred to as an "electric motor") 1 (an example of a rotating electric machine) is of an outer rotor type and is driven by a multi-phase (three-phase in this example) armature current. The motor 1 is mounted, for example, on a compressor, a fan, or the like of an air conditioner.

As shown in FIGS. 1 and 2, the motor 1 includes a rotor 10, a stator 20, and a stationary member 30. As shown in FIG.

As shown in FIG. 1, a rotor (also referred to as a "rotor") 10 is arranged radially outside the motor 1 (hereinafter simply "radial direction") with respect to a stator 20, and has a rotation axis AX. configured to be rotatable around. The rotor 10 includes a rotor core 11 , a plurality of (20 in this example) permanent magnets 12 , and a rotating shaft member 13 .

A rotor core (also referred to as a “rotor core”) 11 has, for example, a substantially cylindrical shape, and is arranged so that the rotation axis AX of the motor 1 and the axis of the cylindrical shape substantially coincide. Further, the rotor core 11 has substantially the same length as the stator 20 in the axial direction of the motor 1 (hereinafter simply referred to as "axial direction"). The rotor core 11 is made of, for example, steel plate, cast iron, or dust core. The rotor core 11 is composed of one member in the axial direction. Further, the rotor core 11 may be composed of a plurality of members (for example, six corresponding to the number of stator units 21 described later) laminated in the axial direction.

A plurality of permanent magnets 12 (20 in this example) are arranged at equal intervals in the circumferential direction on the inner peripheral surface of the rotor core 11 . Moreover, the plurality of permanent magnets 12 are formed so as to exist between substantially one end and substantially the other end in the axial direction of the rotor core 11 . The permanent magnet 12 is, for example, a sintered neodymium magnet or a ferrite magnet.

Each of the plurality of permanent magnets 12 is magnetized with different magnetic poles at both ends in the radial direction. Two permanent magnets 12 adjacent in the circumferential direction among the plurality of permanent magnets 12 are magnetized with different magnetic poles on the inner side in the radial direction facing the stator 20 . Therefore, on the radially outer side of the stator 20, in the circumferential direction, the permanent magnets 12 magnetized with N poles radially inward and the permanent magnets 12 magnetized with S poles radially inwardly are arranged. are arranged alternately.

Each of the plurality of permanent magnets 12 may be composed of one magnet member in the axial direction, or a plurality of magnet members divided in the axial direction (for example, the number corresponding to the number of laminated rotor core 11 members). 6) magnet members. In this case, the plurality of magnet members constituting the axially divided permanent magnets 12 are all magnetized with the same magnetic poles on the inner side in the radial direction facing the stator 20 .

The plurality of permanent magnets 12 arranged in the circumferential direction are composed of a single member in the circumferential direction, such as an annular ring magnet or a plastic magnet in which magnetic poles different in the circumferential direction are alternately magnetized. Permanent magnets may be substituted. In this case, the permanent magnet, which is composed of one member in the circumferential direction, may also be composed of one member in the axial direction, and may be composed of one member as a whole. Also, the permanent magnet formed of one member in the circumferential direction may be divided into a plurality of members in the axial direction, as in the case of the plurality of permanent magnets 12 . Moreover, in the circumferential direction, when a plastic magnet composed of one member is employed, the rotor core 11 may be omitted.

The rotating shaft member 13 has, for example, a substantially cylindrical shape, and is arranged so that the rotating shaft center AX of the motor 1 and the cylindrical shaft center substantially coincide with each other. The rotary shaft member 13 is rotatably supported by, for example, bearings or the like provided at both ends of the insertion member 24 in the axial direction. As will be described later, the insertion member 24 is fixed to the fixing member 30 . Thereby, the rotating shaft member 13 can rotate about the rotation axis AX with respect to the fixed member 30 . The rotating shaft member 13 is connected to the rotor core 11 at, for example, an end portion opposite to the end portion of the motor 1 on the side of the fixed member 30 in the axial direction (hereinafter referred to as the “tip portion of the motor 1” for convenience). be done. The connecting member may have, for example, a substantially disc shape that closes the substantially cylindrical open end of the rotor core 11 . As a result, the rotor core 11 and the plurality of permanent magnets 12 fixed to the inner peripheral surface of the rotor core 11 move along the rotation axis AX of the motor 1 with respect to the fixed member 30 in accordance with the rotation of the rotary shaft member 13 . can rotate around.

As shown in FIG. 2, the stator (also referred to as "stator") 20 is arranged radially inside the rotor 10 (rotor core 11 and permanent magnets 12). The stator 20 includes a plurality (six in this example) of claw pole type stator units (hereinafter simply referred to as “stator units”) 21, a plurality (two in this example) of interphase members 22, and end A member 23 and an insertion member 24 are included.

As shown in FIGS. 3A and 3B, the stator unit 21 includes a pair of stator cores 211 and windings 212 .

A pair of stator cores (also referred to as “stator cores”) 211 (an example of cores) are provided to surround windings 212 . The stator core 211 is made of, for example, a dust core. Stator core 211 includes a yoke portion 211A, a plurality of claw poles 211B, a yoke portion 211C, and insertion holes 211D.

The yoke portion 211A has an annular shape when viewed in the axial direction and has a predetermined thickness in the axial direction.

The plurality of claw poles 211B are arranged at equal intervals in the circumferential direction on the outer peripheral surface of the yoke portion 211A, and protrude radially outward from the outer peripheral surface of the yoke portion 211A. The claw magnetic pole 211B includes a claw magnetic pole portion 211B1.

The claw magnetic pole portion 211B1 (an example of the first claw magnetic pole portion) has a predetermined width and protrudes from the outer peripheral surface of the yoke portion 211A by a predetermined length.

Moreover, the claw magnetic pole 211B further includes a claw magnetic pole portion 211B2. As a result, a relatively large opposing area between the magnetic pole surfaces of the claw poles 211B magnetized by the armature current of the winding 212 and the rotor 10 can be ensured. Therefore, the torque of the motor 1 can be relatively increased, and the output of the motor 1 can be improved.

The claw magnetic pole portion 211B2 (an example of the second claw magnetic pole portion) protrudes from the tip of the claw magnetic pole portion 211B1 toward the other of the pair of stator cores 211 in the axial direction by a predetermined length. For example, as shown in FIG. 3A, the claw magnetic pole portion 211B2 may have a tapered shape in which the width becomes narrower with distance from the claw magnetic pole portion 211B1 in the axial direction. Further, for example, as shown in FIG. 3B, the claw magnetic pole portion 211B2 may have a constant width regardless of the distance from the claw magnetic pole portion 211B1.

As shown in FIG. 2, the positions of the tip portions of the claw magnetic pole portions 211B2 formed in one stator core 211 of the pair of stator cores 211 are different from each other in the axial direction of the other stator core 211 in the axial direction. (the end surface of the yoke portion 211A). As a result, the motor 1 prevents the claw magnetic pole portions 211B2 formed in one stator iron core 211 from protruding from the axial end face of the other stator iron core 211, while maximizing the magnetic pole surfaces of the claw magnetic pole portions 211B2. It is possible to secure as wide a range as possible. Therefore, the torque of the motor 1 can be further increased, and the output of the motor 1 can be further improved.

Note that the claw magnetic pole portion 211B2 may be omitted.

The yoke portion 211C is configured such that a portion near the inner peripheral surface of the yoke portion 211A protrudes toward the other of the pair of stator cores 211 by a predetermined amount. It has a small toric shape. As a result, the pair of stator cores 211 are in contact with each other at the yoke portions 211C, and a space for accommodating the winding 212 is created between the pair of yoke portions 211A corresponding to the pair of stator cores 211 .

The insertion member 24 is inserted through the insertion hole 211D. The insertion hole 211D is implemented by the inner peripheral surfaces of the yoke portion 211A and the yoke portion 211C.

A winding (also referred to as a “coil”) 212 is wound in an annular shape when viewed in the axial direction. The winding 212 has one end electrically connected to an external terminal of the motor 1 and the other end electrically connected to a neutral point. External terminals of the motor 1 are electrically connected to a power source and a drive device (for example, an inverter or the like) that drives the motor 1 with power supplied from the power source. The windings 212 are arranged between the pair of stator cores 211 (yoke portions 211A) in the axial direction. In addition, the winding 212 is wound so that the inner peripheral portion is radially outside the yoke portions 211C of the pair of stator cores 211 .

As shown in FIG. 2, the pair of stator cores 211 are combined so that the claw poles 211B of one stator core 211 and the claw poles 211B of the other stator core 211 are alternately arranged in the circumferential direction. . Further, when an armature current flows through the annular winding 212, the claw magnetic poles 211B of one stator core 211 of the pair of stator cores 211 and the claw magnetic poles 211B of the other stator core 211 are magnetized. and have different magnetic polarities. As a result, in the pair of stator cores 211, one claw pole 211B projecting from one stator core 211 is adjacent in the circumferential direction and has a different magnetic pole from the other claw pole 211B projecting from the other stator core 211. have Therefore, due to the armature current flowing through the windings 212 , the N pole claw magnetic poles 211 B and the S pole claw magnetic poles 211 B are alternately arranged in the circumferential direction of the pair of stator cores 211 .

As shown in FIG. 2, the plurality of stator units 21 are stacked in the axial direction.

The plurality of stator units 21 include a plurality of sets (two sets in this example) of stator units 21 for a plurality of phases (three phases in this example). Specifically, the plurality of stator units 21 includes stator units 21A and 21B corresponding to the U phase, stator units 21C and 21D corresponding to the V phase, and stator units 21E and 21F corresponding to the W phase. including. Thus, the motor 1 includes a plurality of stator units 21 of the same phase. Therefore, the output of the motor 1 can be improved as compared with the case where the stator unit 21 of the same phase is singular.

Incidentally, the number of phases of the motor 1 may be two or four or more. Further, three or more stator units 21 for multiple phases may be combined.

Two stator units 21 of the same phase are arranged so that their circumferential positions coincide with each other in electrical angle. In addition, the two stator units 21 of different phases are arranged such that their circumferential positions are different from each other by 120° in electrical angle.

Also, two stator units 21 of the same phase are laminated so as to be adjacent in the axial direction. Specifically, the U-phase stator units 21A and 21B are arranged adjacent to each other, the V-phase stator units 21C and 21D are arranged adjacent to each other, and the W-phase are arranged so as to be adjacent to each other.

Two stator units of some of the two U-phase stator units 21A and 21B, the two V-phase stator units 21C and 21D, and the two W-phase stator units 21E and 21F The configuration may be such that only the units 21 are arranged adjacent to each other in the axial direction. In this case, since the portion where the two stator units 21 of different phases are adjacent to each other increases, an interphase member 22, which will be described later, may be added.

The interphase member 22 is provided between the stator units 21 of different phases adjacent in the axial direction. As a result, a predetermined distance can be secured between the two stator units 21 of different phases, and magnetic flux leakage between the two stator units 21 of different phases can be suppressed. Interphase member 22 is, for example, a non-magnetic material. This can further suppress magnetic flux leakage between the two stator units 21 of different phases. Interphase member 22 includes UV interphase member 22A and VW interphase member 22B.

The UV interphase member 22A is provided between the U-phase stator unit 21B and the V-phase stator unit 21C, which are axially adjacent to each other. The UV interphase member 22A has, for example, a substantially cylindrical shape (substantially disk shape) with a predetermined thickness, and an insertion hole through which the insertion member 24 is inserted is formed in the central portion. Hereinafter, the same may be applied to the VW interphase member 22B.

The VW interphase member 22B is provided between the V-phase stator unit 21D and the W-phase stator unit 21E, which are axially adjacent to each other.

The end member 23 is provided at the end of the plurality of stacked stator units 21 on the tip side of the motor 1 . Specifically, the end member 23 is provided so as to come into contact with the end surface of the stator unit 21A opposite to the side facing the stator unit 21B in the axial direction. The end member 23 has, for example, a substantially cylindrical shape (substantially disk shape) having a predetermined thickness, and an insertion hole through which the insertion member 24 is inserted is formed in the central portion. The end member 23 is, for example, a non-magnetic material. As a result, magnetic flux leakage from the stator unit 21A (specifically, the stator core 211 on the tip side of the motor 1) can be suppressed.

The insertion member 24 includes end members 23, stator units 23A and 23B, UV interphase members 22A, stator units 23C and 23D, VW interphase members 22B, and stator units 23E and 23F in this order from the tip end of the motor 1. The distal end portion is fixed to the fixing member 30 in the inserted state. The inserting member 24 has, for example, a male threaded portion at its distal end, and is fixed to the fixing member 30 by being screwed into a corresponding female threaded portion of the fixing member 30 . Further, the insertion member 24 has, for example, a substantially cylindrical shape, and the rotating shaft member 13 is rotatably arranged in a hole realized by the inner peripheral surface. Moreover, the insertion member 24 has a head portion having an outer diameter relatively larger than the inner diameter of the insertion hole 211</b>D of the stator unit 21 on the distal end side of the motor 1 . As a result, for example, by tightening the insertion member 24 to the fixing member 30 to some extent, a force in the axial direction toward the fixing member 30 can be applied from the head portion to the end member 23 . Therefore, a plurality of stator units 21 (stator units 21A to 21F) and interphase members 22 (UV interphase members 22A and VW interphase members 22B) are fixed to the fixing member 30 in such a manner that they are sandwiched between the end member 23 and the fixing member 30. be able to.

The fixed member 30 has, for example, a substantially disk shape with an outer diameter larger than that of the rotor 10 (rotor core 11) when viewed in the axial direction, and has a predetermined thickness in the axial direction. As described above, the rotor 10 is rotatably supported by the fixing member 30 via the insertion member 24, and the stator 20 is fixed.

[Configuration of two stator units of the same phase]
Next, with reference to FIGS. 4 to 6, a detailed configuration of two stator units 21 of the same phase adjacent in the axial direction will be described. Hereinafter, the relationship between the two U-phase stator units 21A and 21B applies to the relationship between the two V-phase stator units 21C and 21D and the relationship between the two W-phase stator units 21E and 21F. The description will focus on the two phase stator units 21A and 21B.

FIG. 4 is a perspective view showing the configuration of two stator units 21 of the same phase. Specifically, FIG. 4 is a perspective view showing the configuration of two U-phase stator units 21A and 21B. 5A and 5B are diagrams showing an example and another example of the configuration of the two windings 212 when the two windings 212 corresponding to the two stator units 21 of the same phase are connected in series, respectively. be. 6A and 6B are diagrams respectively showing an example and another example of the configuration of the two windings 212 when the two windings 212 corresponding to the two stator units 21 of the same phase are connected in parallel. be.

The letter "N" or "S" appended to the claw magnetic pole 211B in FIG. 4 represents the magnetic pole at a certain timing when the armature current is flowing through the windings 212 of the stator units 21A and 21B. , and the magnetic pole of the claw magnetic pole 211B changes according to the direction of the armature current. 5A, 5B, 6A, and 6B, the windings 212 corresponding to the stator units 21A, 21B are represented by windings 212A, 212B, respectively.

As shown in FIG. 4, in the same U-phase stator units 21A and 21B, the stator cores 211 (yoke portions 211A) facing each other in the axial direction are in contact with each other. The stator units 21A and 21B are arranged such that the claw magnetic poles 211B are substantially mirror images of each other. The substantially mirror image relationship includes, for example, the case where there is a slight circumferential deviation between the stator units 21A and 21B that falls within the assembly tolerance in manufacturing (assembling) the motor 1 . Specifically, the stator units 21A and 21B are arranged such that the claw magnetic poles 211B are substantially symmetrical with respect to their contact surfaces.

In addition, the windings 212 of the stator units 21A and 21B are wound in opposite directions when viewed from the circuit end portions on the power supply side and the neutral point side of the motor 1 . "The mutual windings 212 are wound in opposite directions when viewed from the circuit end on the power supply side and the neutral point side of the motor 1" means that an alternating current of the same phase (U phase in this example) flows. This means that the two annular windings 212 have currents flowing in directions opposite to each other. As a result, as shown in FIG. 4, the claw poles 211B of the two stator cores 211 facing (in contact with) the stator units 21A and 21B are connected to the two windings of the stator units 21A and 21B. Due to the armature current flowing through 212, they are magnetized and have the same magnetic poles as each other. Therefore, the magnetic flux directions in the claw magnetic poles 211B (claw magnetic pole portions 211B1) formed in the two stator cores 211 facing (in contact with) the stator units 21A and 21B are substantially the same.

If the stator units 21 of a plurality of phases are simply stacked in the axial direction such that different phases are adjacent to each other in the axial direction (for example, U phase, V phase, and W phase are arranged in order), All stator units 21 are adjacent to stator units 21 of different phases. Then, in order to suppress magnetic flux leakage between the stator iron cores 211 of all the combinations of the two adjacent stator units 21, a space is provided between the two adjacent stator units 21, or It may be necessary to provide the above-described interphase member 22 in the space.

Also, even if a plurality of stator units 21 of the same phase are stacked adjacent to each other, if the magnetic poles of the claw magnetic poles 211B formed in the two facing stator cores 211 are different from each other due to the armature current. , the magnetic flux directions of the claw magnetic poles 211B, which are in a substantially mirror image relationship, are different. Also, if the arrangement of the claw poles 211B of two adjacent stator units 21 of the same phase is not in a substantially mirror image relationship (specifically, the two stator units 21 are stacked in the same direction), the same , the magnetic flux directions of the claw poles 211B of the two facing stator cores 211 are different. Then, in order to suppress magnetic flux leakage between the two facing stator cores 211, a gap is provided between the two adjacent stator units 21 of the same phase, or the gap is adjusted as described above. It may be necessary to provide a member similar to the interphase member 22 of .

Therefore, in either case, the axial dimension of the motor may increase as a result.

In contrast, in the present embodiment, as described above, the magnetic flux directions of the claw poles 211B formed on the two stator cores 211 facing (in contact with) the stator units 21A and 21B are substantially the same. can be Therefore, even if the gap between the stator units 21A and 21B is relatively small or if a member for suppressing magnetic flux leakage is not provided in the gap, the distance between the two facing stator cores 211 can be reduced. magnetic flux leakage can be suppressed. Therefore, the dimension in the axial direction can be relatively reduced, and the motor 1 can be miniaturized.

Further, as described above, the positions of the tip portions of the claw magnetic pole portions 211B2 formed in one stator core 211 of the pair of stator cores 211 are different from each other in the axial direction of the other stator core 211 in the axial direction. It substantially coincides with the position of the end surface (the end surface of the yoke portion 211A). Therefore, as shown in FIG. 4, claw magnetic pole portions 211B2 (the claw magnetic pole portions of the S pole in the drawing) formed in the two stator cores 211 located at the two end portions of the two adjacent stator units 21 of the same phase. 211B2) are in contact with each other. Therefore, the magnetic pole surface of the claw magnetic pole portion 211B2 can be secured as wide as possible, and the torque of the motor 1 can be increased.

The two windings 212 through which the same phase alternating current flows may be connected in series or in parallel. A connection body of two windings 212 through which the same phase alternating current flows and which is connected in series or in parallel has one end connected to an external terminal on an electrical circuit and the other end connected to a neutral point. Therefore, the two windings 212 corresponding to the two stator units 21A and 21B of the same phase are wound in opposite directions when viewed from the power supply (external terminal) side and the neutral point side of the motor 1, respectively. As a result, currents flow in directions opposite to each other.

For example, as shown in FIG. 5A, the windings 212A and 212B corresponding to the stator units 21A and 21B have ends located on the radially inner periphery (hereinafter referred to as "inner periphery ends" for convenience). ) 212A1 and 212B1 are wound counterclockwise (counterclockwise) in the figure. A connecting portion 213 connected by The windings 212A and 212B are thereby electrically connected in series. One of inner peripheral ends 212A1 and 212B1 is connected to an external terminal, and the other is connected to a neutral point.

In this example, the winding 212A is wound counterclockwise (counterclockwise) in the drawing when viewed from the inner peripheral end portion 212A1 corresponding to the circuit end portion on the power supply side or the neutral point side of the motor 1. . On the other hand, when viewed from the inner peripheral end portion 212A1, the winding 212B is wound clockwise (rightward) in the figure because the winding start (starting end) is the outer peripheral end portion 212B2. The winding 212B is wound counterclockwise (counterclockwise) when viewed from the inner peripheral end portion 212B1 corresponding to the circuit end portion on the neutral point side or the power supply side of the motor 1 . On the other hand, when viewed from the inner peripheral end portion 212B1, the winding 212A is wound clockwise (rightward) in the figure because the winding start (beginning end) is the outer peripheral end portion 212A2. Therefore, a reverse current flows through the two windings 212A and 212B. In this example, the connecting portion 213 connects between the outer peripheral end portions 212A2 and 212B2 located at the outer peripheral portions in the radial direction of the two windings 212A and 212B. Therefore, the connection portion 213 has a relatively short distance and does not straddle between the inner and outer peripheral portions of the two windings 212A and 212B. Therefore, a designer can relatively easily design a space between other components to pass the connection portion 213 .

In this example, the connecting portion 213 is located between the inner peripheral end portions 212A1 and 212B1 located on the radially inner peripheral portions of the two windings 212A and 212B instead of between the outer peripheral end portions 212A2 and 212B2. You can connect between

In this way, the two windings 212 wound in the same physical direction are connected in series at the outer peripheral ends or the inner peripheral ends. As a result, two windings 212 of the same phase, which are wound in opposite directions to each other, can be formed when viewed from the circuit ends on the power supply side and the neutral point side of the motor 1 .

Further, for example, as shown in FIG. 5B, the winding 212A corresponding to the stator unit 21A is wound counterclockwise (counterclockwise) in the drawing from the inner peripheral end 212A1. The winding 212B corresponding to the stator unit 21B is wound clockwise (rightward) in the drawing from the inner peripheral end 212B1. A connecting portion 213 connects between an outer peripheral end portion 212A2 of the winding 212A and an inner peripheral end portion 212B1 of the winding 212B. The windings 212A and 212B are thereby electrically connected in series. One of the inner peripheral end portion 212A1 and the outer peripheral end portion 212B2 is connected to an external terminal, and the other is connected to a neutral point.

In this example, the winding 212A rotates counterclockwise (counterclockwise) in the drawing when viewed from the inner peripheral end portion 212A1 corresponding to the circuit end portion on the power supply (external terminal) side or neutral point side of the motor 1. Rolled. On the other hand, when viewed from the inner peripheral end portion 212A1, the winding 212B is wound clockwise (rightward) in the figure because the winding start (beginning end) is the inner peripheral end portion 212B1. Further, the winding 212B is wound counterclockwise (counterclockwise) in the figure when viewed from the outer peripheral end portion 212B2 corresponding to the circuit end portion on the neutral point side or the power supply side of the motor 1 . On the other hand, when viewed from the outer peripheral end portion 212B2, the winding 212A is wound clockwise (rightward) in the figure because the winding start (starting end) is the outer peripheral end portion 212A2. Therefore, a reverse current flows through the two windings 212A and 212B.

In this example, the connecting portion 213 may connect between the inner peripheral end portion 212A1 and the outer peripheral end portion 212B2 instead of between the outer peripheral end portion 212A2 and the inner peripheral end portion 212B1.

In this way, the two windings 212 physically wound in opposite directions are connected in series at the inner peripheral end on one side and the outer peripheral end on the other side. Two windings 212 of the same phase can be constructed.

Further, for example, as shown in FIG. 6A, the windings 212A and 212B corresponding to the stator units 21A and 21B are wound clockwise (rightward) in the drawing from inner peripheral end portions 212A1 and 212B1, respectively. there is A connecting portion 214 connects between an outer peripheral end portion 212A2 of the winding 212A and an inner peripheral end portion 212B1 of the winding 212B, and the connecting portion 214 is connected to an external terminal. In addition, an inner peripheral end portion 212A1 of the winding 212A and an outer peripheral end portion 212B2 of the winding 212B are connected to a neutral point. The two windings 212A and 212B are thereby electrically connected in parallel.

In this example, when viewed from the outer peripheral end portion 212A2 (inner peripheral end portion 212B1) corresponding to the circuit end portion on the power supply (external terminal) side of the motor 1, the winding 212A rotates counterclockwise (counterclockwise) in the drawing. is wrapped in On the other hand, when viewed from the inner peripheral end portion 212B1 (outer peripheral end portion 212A2) corresponding to the circuit end portion on the power supply (external terminal) side of the motor 1, the winding 212B is wound clockwise (rightward) in the figure. ing. In addition, the winding 212A is wound clockwise (rightward) when viewed from the inner peripheral end portion 212A1 (outer peripheral end portion 212B2) corresponding to the circuit end portion on the neutral point side of the motor 1. . On the other hand, when viewed from the outer peripheral end portion 212B2 (inner peripheral end portion 212A1) corresponding to the circuit end portion on the neutral point side of the motor 1, the winding 212B is wound counterclockwise (counterclockwise). Therefore, a reverse current flows through the two windings 212A and 212B.

In this example, the outer peripheral end 212A2 of the winding 212A and the inner peripheral end 212B1 of the winding 212B are connected to the neutral point, and the inner peripheral end 212A1 of the winding 212A and the outer peripheral end 212B2 of the winding 212B are connected to the neutral point. may be connected to an external terminal via the connection portion 214 .

Thus, two windings 212 wound in the same physical direction are paralleled between one inner peripheral end and the other outer peripheral end and between the other outer peripheral end and one inner peripheral end. Connecting. As a result, two windings 212 of the same phase, which are wound in opposite directions to each other, can be formed when viewed from the circuit ends on the power supply side and the neutral point side of the motor 1 .

Further, for example, as shown in FIG. 6B, the winding 212A corresponding to the stator unit 21A is wound counterclockwise (counterclockwise) in the drawing from the inner peripheral end 212A1. The winding 212B corresponding to the stator unit 21B is wound clockwise (rightward) in the drawing from the inner peripheral end 212B1. An outer peripheral end portion 212A2 of the winding 212A and an outer peripheral end portion 212B2 of the winding 212B are connected by a connecting portion 214, and the connecting portion 214 is connected to an external terminal. Also, the inner peripheral end portions 212A1 and 212B1 are connected to a neutral point. The two windings 212A and 212B are thereby electrically connected in parallel.

In this example, the winding 212A is wound clockwise (rightward) in the figure when viewed from the outer peripheral end portion 212A2 (outer peripheral end portion 212B2) corresponding to the circuit end portion on the power supply (external terminal) side of the motor 1. It is written. On the other hand, when viewed from the outer peripheral end portion 212B2 (outer peripheral end portion 212A2) corresponding to the circuit end portion on the power supply (external terminal) side of the motor 1, the winding 212B is wound counterclockwise (counterclockwise) in the figure. ing. When viewed from the inner peripheral end portion 212A1 (inner peripheral end portion B1) corresponding to the circuit end portion on the neutral point side of the motor 1, the winding 212A is wound counterclockwise (counterclockwise) in the figure. ing. On the other hand, when viewed from the inner peripheral end portion 212B1 (inner peripheral end portion 212A1) corresponding to the circuit end portion on the neutral point side of the motor 1, the winding 212B is wound clockwise (rightward) in the drawing. there is Therefore, a reverse current flows through the two windings 212A and 212B.

In this example, the inner peripheral end portions 212A1 and 212B1 may be connected to the external terminal through the connecting portion 214, and the outer peripheral end portions 212A2 and 212B2 may be connected to the neutral point.

In this way, the two windings 212 physically wound in opposite directions are connected in parallel at their outer peripheral ends and their inner peripheral ends. As a result, two windings 212 of the same phase, which are wound in opposite directions to each other, can be formed when viewed from the circuit ends on the power supply side and the neutral point side of the motor 1 .

[Action]
Next, operation of the motor 1 according to this embodiment will be described.

In this embodiment, the two stator units 21 of the same phase that are adjacent in the axial direction are arranged such that the claw poles 211B are substantially mirror images of each other. In two stator units 21 of the same phase that are axially adjacent to each other, the windings 212 are wound in opposite directions when viewed from the circuit ends on the power supply side and the neutral point side. Further, two stator units 21 of the same phase that are axially adjacent to each other are such that the axial distance between the facing stator cores 211 is equal to that of the two stator units of different phases that are axially adjacent. 21 is smaller than the axial distance between the facing stator cores 211 .

In this embodiment, the two stator units 21 of the same phase adjacent in the axial direction are in a substantially mirror image relationship with the axial ends (yoke portions 211A) facing each other's stator cores 211. The polarities of the magnetic poles due to the armature current of the arranged claw magnetic poles 211B are the same. In two stator units 21 of the same phase that are adjacent in the axial direction, the axial distance between the facing stator cores 211 is equal to that of the two stator units of different phases that are adjacent in the axial direction. 21 is smaller than the axial distance between the facing stator cores 211 .

As a result, even if the axial distance between the two stator units 21 of the same phase is relatively short, the motor 1 can maintain the magnetic flux of the claw poles 211B formed in the two facing stator cores 211. By aligning the directions in substantially the same direction, magnetic flux leakage can be suppressed. Therefore, the motor 1 can be miniaturized.

Incidentally, as described above, three or more stator units 21 for a plurality of phases may be combined. In this case, at least two of the three or more same-phase stator units 21 may be arranged adjacent to each other in the axial direction. Moreover, when there are three or more combinations of two stator units 21 of the same phase that are adjacent in the axial direction, it is sufficient that at least one of the combinations has the above relationship. As a result, the above functions and effects can be obtained at least with respect to the combination.

In the present embodiment, two stator units 21 of the same phase adjacent in the axial direction may have an axial distance of zero between the facing stator cores 211 .

Thereby, the motor 1 can be further miniaturized.

The axial distance between the facing stator cores 211 of the two stator units 21 of the same phase is equal to the distance between the facing stator cores 211 of the two adjacent stator units 21 of different phases in the axial direction. It may be greater than 0 to the extent that it is less than the axial distance between cores 211 . Thereby, the motor 1 can suppress the cogging torque. Further, a member similar to the interphase member 22 may be provided between the two stator cores 211 facing each other of the two stator units 21 of the same phase. Thereby, the motor 1 can further suppress the cogging torque.

Further, in this embodiment, the claw magnetic pole 211B has a claw magnetic pole portion 211B1 protruding radially toward the rotor 10 from one axial end portion (yoke portion 211A) of the stator core 211 . The claw magnetic pole portion 211B has a claw magnetic pole portion 211B2 that axially protrudes from the tip portion of the claw magnetic pole portion 211B1 toward the other axial end portion of the stator core 211 (the yoke portion 211A of the other stator core 211). have In the two stator units 21 of the same phase that are adjacent in the axial direction, the tips of the claw magnetic pole portions 211B2 formed on the two stator cores 211 positioned at both ends in the axial direction are in contact with each other. good.

As a result, the motor 1 can ensure a relatively wide magnetic pole surface of the claw magnetic pole 211B (claw magnetic pole portion 211B2). Therefore, the motor 1 can relatively increase torque and improve its output.

In this embodiment, two stator units 21 of the same phase that are axially adjacent to each other are wound so that both ends of each winding 212 are positioned on the inner circumference and the outer circumference. Two stator units 21 of the same phase that are adjacent in the axial direction are connected to one end (inner peripheral end) of the inner peripheral portion of each other's windings 212 or the other end of the outer peripheral portion of each other's windings 212 ( outer peripheral ends) may be connected to each other.

As a result, the motor 1 relatively shortens the length of the connection portions 213 and 214 that connect the two windings 212 of the same phase, and the connection portions 213 and 214 are connected to the two windings 212A and 212B. It is possible to avoid bridging between the peripheral portion and the outer peripheral portion. Therefore, for example, the designer can relatively easily design the connecting portions 213 and 214 that connect the two windings 212 of the same phase corresponding to the two stator units 21 of the same phase.

[Transformation/change]
Although the embodiments have been described above, it will be appreciated that various modifications and changes in form and detail may be made without departing from the spirit and scope of the claims.

For example, the configurations of the above-described embodiments may be applied to an inner rotor type claw pole motor in which a rotor is rotatably disposed radially inside a claw pole type stator. In this case, claw poles are formed that protrude radially inward from the inner peripheral side of the stator core.

Further, the configurations of the above-described embodiments and modifications may be applied to, for example, a claw pole generator (an example of a rotating electric machine) such as an alternator, and both the function of a motor (electric motor) and the function of a generator may be applied. It may be applied to a claw-pole type motor generator (an example of a rotating electric machine) having the above.

1 Claw pole motor (rotating electric machine)
10 rotor 11 rotor core 12 permanent magnet 13 rotating shaft member 20 stator 21 stator unit 21A to 21F stator unit 22 interphase member 22A UV interphase member 22B VW interphase member 23 end member 24 insertion member 30 fixing member 211 fixing Child iron core (iron core)
211A yoke portion 211B claw magnetic pole 211B1 claw magnetic pole portion (first claw magnetic pole portion)
211B2 claw magnetic pole portion (second claw magnetic pole portion)

Claims (5)

A multi-phase rotating electric machine comprising a stator in which a plurality of claw pole type stator units are stacked in the axial direction,
The stator units include windings that are wound in an annular shape, iron cores that surround the windings, and stator units that are arranged alternately in the circumferential direction at both ends of the iron core in the axial direction. a plurality of claw poles protruding radially toward the rotor from both ends of the iron core in the axial direction;
At least one of the combinations of two axially adjacent stator units of the same phase included in the plurality of stator units has the claw poles arranged in a substantially mirror image relationship with each other, and are wound in opposite directions when viewed from the circuit end on the power supply side and the neutral point side, and the axial distance between the iron cores is the same among the plurality of stator units less than the axial distance between the cores of two stator units of different phases axially adjacent to each other of
rotating electric machine. A multi-phase rotating electric machine comprising a stator in which a plurality of claw pole type stator units are stacked in the axial direction,
The stator units include windings that are wound in an annular shape, iron cores that surround the windings, and stator units that are arranged alternately in the circumferential direction at both ends of the iron core in the axial direction. a plurality of claw poles protruding radially toward the rotor from both ends of the iron core in the axial direction;
At least one of the combinations of two stator units of the same phase that are adjacent in the axial direction among the plurality of stator units are substantially mirror images of the axial ends facing the cores of each other. The polarities of the magnetic poles due to the armature current of the claw poles arranged in the relationship are the same, and the axial distance between the iron cores of the plurality of stator units is axially adjacent to each other. less than the axial distance between the cores of two stator units of different phases;
rotating electric machine. wherein the at least one set has an axial distance of 0 between the cores of each other;
The rotary electric machine according to claim 1 or 2. The claw magnetic poles include a first claw magnetic pole portion protruding radially toward the rotor from one end portion in the axial direction of the iron core, and a first claw magnetic pole portion protruding in the axial direction from the tip portion of the first claw magnetic pole portion to the axial direction of the iron core. a second claw magnetic pole portion protruding axially toward the other end;
In the at least one pair, tip portions of the second claw magnetic pole portions are in contact with each other.
The rotary electric machine according to any one of claims 1 to 3. The at least one set is wound such that both ends of each of the windings are located on the inner circumference and the outer circumference, and one end of the inner circumference of each other's windings, or one end of each of the windings of each other. The other ends of the outer peripheral portion are connected to each other,
The rotary electric machine according to any one of claims 1 to 4.

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