JP5954198B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine suitable for use in a high-performance small motor for automobiles, particularly HEVs (hybrid electric vehicles).

2. Description of the Related Art Conventionally, a motor used in a hybrid vehicle, particularly an engine direct-coupled motor, is mounted in a narrow space between an engine and a transmission, and thus requires a reduction in size. Further, since the engine is directly connected, the rotational speed is low and a large power cannot be exhibited. Furthermore, since the conventional motor has a single gap structure, and the torque is proportional to the gap area, the motor torque is limited.
For this reason, the engine direct-coupled small motor is only used when assisting the engine driving torque in the low-speed rotation range at the time of engine start or start because the torque that can be generated is limited.

  Therefore, a multi-gap structure motor capable of generating a large torque even in a limited space has been proposed. For example, Patent Document 1 discloses a rotating electrical machine having a three-surface gap structure including an outer stator, an inner stator, and a side stator that are opposed to each other with a magnetic gap on the outer peripheral side and the inner peripheral side of the rotor and one end side in the axial direction. It is shown. That is, in the rotating electrical machine disclosed in Patent Document 1, the rotor is disposed inside the stator having a U-shaped cross section via the magnetic gap.

JP 2012-80692 A

However, since the rotating electrical machine of Patent Document 1 has a rotor disk that supports the rotor with respect to the rotating shaft, the coil end portion of the stator, particularly the coil end portion of the inner stator, may interfere with the rotor disk. For this reason, there has been a problem that the structure is not realized unless the core thickness of the inner stator is made lower than the core thickness of the outer stator.
The stator is a system in which an inner stator core, an outer stator core, and a side stator core are integrally formed to cover the periphery of the rotor in a U-shaped cross section, and a stator coil is housed therein. In this method, since the stator coil becomes long, there is a problem that the resistance value is large and the copper loss is large.
The present invention has been made based on the above circumstances, and an object thereof is to provide a small and high-performance rotating electrical machine capable of shortening the winding length of a stator coil.

(Invention according to Claim 1)
The present invention provides a stator having an annular stator core whose one end in the axial direction is fixed to a housing, a stator coil wound around the stator core, and magnetic gaps at least on the radially outer side and the inner side of the stator core. A rotor having an outer rotor core and an inner rotor core disposed via each other, and having a rotor connecting portion that connects the outer rotor core and the inner rotor core on the other end side in the axial direction, and having a U-shaped cross section. provided, stator core, among the plurality of the peripheral surface respectively opposed slots on the outer peripheral surface and an inner rotor core facing the outer rotor core is formed circumferentially constant pitch along the axial direction, the stator coil, through a plurality of slots a rotary electric machine that will be wound around the cross-section U-shaped stator core, the stator core forms a stator yoke And a plurality of teeth provided separately from the core body. The core body has a plurality of teeth grooves on the outer circumferential surface and the inner circumferential surface in the axial direction. The teeth portion is formed in a U-shaped cross section, and is fitted to the tooth groove from the other axial end of the core body and assembled to the core body. A slot is formed between adjacent tooth portions .

  In the rotating electrical machine of the present invention, an annular stator core is disposed in the inner space of a rotor having a U-shaped cross section, and a stator coil is wound around the stator core. The winding length of the stator coil can be shortened. That is, the rotating electrical machine of Patent Document 1 covers the outer side of the rotor with a stator core having a U-shaped cross section, whereas the rotating electrical machine of the present invention has an annular stator core inside the rotor having a U-shaped cross section. Is arranged. Therefore, under the condition where the overall rating of the rotating electrical machine is restricted, the winding length of the stator coil wound in a U-shaped cross-section with respect to the stator core can be shortened in the present invention compared to Patent Document 1. .

The stator core around which the stator coil is wound is, for example, an annular shape that can be called a torus shape, and has a simple structure in which one end side in the axial direction is fixed to the housing. For this reason, it is possible to provide a small and high-performance rotating electrical machine.
Further, in the rotating electrical machine of the present invention, since the outer surface of the stator core is covered with the rotor core having a U-shaped cross section, the coil end of the stator does not interfere with the rotor disk that supports the rotor core as in Patent Document 1. There is no need to limit the thickness of the stator core.

(Invention of Claim 6 )
The present invention relates to a stator having a disk-shaped stator core whose outer peripheral side in the radial direction orthogonal to the axial direction is fixed to the housing and opened on the inner peripheral side, a stator coil wound around the stator core, and at least the axial direction of the stator core A rotary electric machine having an axial gap structure provided with a rotor having a pair of disk-shaped rotor cores disposed on both sides via a magnetic gap, wherein the stator core has both axial side surfaces facing the pair of disk-shaped rotor cores. A plurality of slots are formed at equal circumferential pitches along the radial direction, and the stator coil is wound around the stator core in a U-shaped cross section through the plurality of slots.

In the rotating electrical machine of the present invention, since the stator coil is wound around a disk-shaped stator core that opens on the radially inner peripheral side, the winding length of the stator coil is shorter than that of the rotating electrical machine disclosed in Patent Document 1. it can. That is, while the rotating electrical machine of Patent Document 1 covers the outer side of the rotor with a stator core having a U-shaped cross section, the rotating electrical machine of the present invention has a disk-shaped stator core between a pair of disk-shaped rotor cores. It is arranged. Therefore, under the condition where the overall rating of the rotating electrical machine is restricted, the winding length of the stator coil wound in a U-shaped cross-section with respect to the stator core can be shortened in the present invention compared to Patent Document 1. .
The stator core around which the stator coil is wound has, for example, a hollow disk shape that can be called a torus shape, and has a simple structure in which a radially outer peripheral side is fixed to the housing. For this reason, it is possible to provide a small and high-performance rotating electrical machine.

1 is a sectional view of a motor according to Embodiment 1. FIG. It is a disassembled perspective view which shows the state which decomposed | disassembled the stator core which concerns on Example 1 into the core main body and the teeth part. It is a perspective view which shows the state which wound the stator coil to the stator core which concerns on Example 1. FIG. 1 is a perspective view of a stator coil according to Embodiment 1. FIG. It is a perspective view of the teeth part which concerns on Example 2. FIG. It is a perspective view of the teeth part which concerns on Example 2. FIG. (A) It is sectional drawing which expand | deployed a part of stator concerning Example 3 linearly. FIG. 7B is a cross-sectional view taken along the line VII-VII in FIG. 6 is a sectional view of a motor according to Embodiment 4. FIG. FIG. 10 is a cross-sectional view of a motor according to a fifth embodiment. FIG. 10 is a perspective view of a stator coil according to a sixth embodiment.

  The mode for carrying out the present invention will be described in detail with reference to the following examples.

Example 1
Example 1 is an example in which the rotating electrical machine of the present invention is applied to a traveling motor arranged between an engine and a transmission of a hybrid vehicle.
As shown in FIG. 1, the traveling motor (hereinafter referred to as motor 1) includes a rotor R having a U-shaped cross section (shown in an inverted U-shape in FIG. 1), and a U-shaped rotor R. And an annular stator S disposed in the character space.
Hereinafter, in the axial direction of the motor 1 shown in FIG. 1 (the left-right direction in the figure), the right side in the figure is defined as the mission side and the left side in the figure is defined as the engine side.
The rotor R is a surface magnet type rotor in which a permanent magnet 3 is attached to the surface of a rotor core 2 described below. The permanent magnet 3 may be embedded near the surface of the rotor core 2. Alternatively, a configuration may be adopted in which the surface of the permanent magnet 3 is exposed on the surface of the rotor core 2 and is incorporated in a concave space formed in the rotor core 2.

The rotor core 2 is disposed on the radially outer side (the upper side in the drawing) and the inner side (the lower side in the drawing) with respect to the stator S, and is disposed on the engine side in the axial direction with the outer rotor core 2a and the inner side. It is comprised by the side rotor core 2c which connects the rotor core 2b.
The permanent magnet 3 includes an outer magnet 3a attached to the inner diameter side surface of the outer rotor core 2a, an inner magnet 3b attached to the outer diameter side surface of the inner rotor core 2b, and a side attached to the axial surface of the side rotor core 2c. It is a magnet 3c. Outer magnet 3a, inner magnet 3b, and side magnet 3c all have the same polarity in the same position in the circumferential direction, and “S pole” and “N pole” are alternately arranged in the circumferential direction. Placed in.

The rotor R has a rotor disk 4 extending in the inner diameter direction at the transmission side end of the inner rotor core 2b, and the rotor disk 4 is provided on a transmission shaft (hereinafter referred to as a TM shaft 5). The bolt 6 is fastened and fixed to the flange-shaped shaft hub 5a.
A multi-plate clutch 9 is disposed between the inner rotor core 2b and the motor shaft 8 connected to the engine crankshaft 7 on the inner diameter side. The motor shaft 8 is integrally provided with a flange portion 8 a at an end portion on the engine side, and the flange portion 8 a is fixed to a flange-shaped shaft hub 7 a provided on the crankshaft 7 by fastening bolts 10.
Further, in the rotor R, the transmission side end portion of the outer rotor core 2a is rotatably supported by the transmission housing 12 via the bearing 11 in order to suppress deformation due to centrifugal force and vibration due to vibration.

The stator S includes an annular stator core 13 whose axial transmission side end surface is fixed to a transmission housing 12 with a non-magnetic through bolt (not shown) or the like, and a stator coil 14 wound around the stator core 13. It consists of.
As shown in FIG. 1, the stator core 13 is formed with a plurality of slots s (s1, s2, s3) on the outer peripheral surface and inner peripheral surface in the radial direction and the end surface on the other end side in the axial direction. Here, the slot s formed on the outer peripheral surface of the stator core 13 is the outer slot s1, the slot s formed on the inner peripheral surface of the stator core 13 is the inner slot s2, and the slot s formed on the axial end surface of the stator core 13 is the side surface. Called slot s3. The outer slots s1 and the inner slots s2 are formed at a constant circumferential pitch along the axial direction of the stator core 13, and the side slots s3 communicate with the outer slots s1 and the inner slots s2 in the radial direction at a uniform circumferential pitch. It is formed. That is, the outer slot s1, the inner slot s2, and the side slot s3 are formed in a U-shaped cross section.

As shown in FIG. 2, the stator core 13 includes a ring-shaped core body 13A that forms a stator yoke, and a plurality of tooth portions 13B that are provided separately from the core body 13A.
The core main body 13A is configured by, for example, laminating a plurality of ring-shaped core sheets punched out of a magnetic steel sheet with a press. In the core body 13A, a plurality of teeth grooves 13a are formed on the outer peripheral surface and the inner peripheral surface in the radial direction at equal pitches in the circumferential direction along the axial direction.
The teeth portion 13B is configured by, for example, laminating a plurality of teeth plates punched out of an electromagnetic steel plate into a U-shaped cross section by a press. The teeth portion 13B is fitted into a tooth groove 13a formed on the outer peripheral surface and inner peripheral surface of the core main body 13A and assembled to the core main body 13A, and between the tooth portions 13B adjacent to each other in the circumferential direction of the stator core 13. A slot s is formed.

The stator coil 14 is, for example, a star-connected three-phase winding. As shown in FIG. 3, the winding of each phase (X phase, Y phase, Z phase) winds an electrical angle π around the stator core 13. Wave winding is performed as a line pitch, and the winding terminals of each phase are connected to an external inverter (not shown). FIG. 3 illustrates a state in which the stator coil 14 is wound around the core body 13A and the teeth portion 13B is assembled.
The winding of each phase is formed in a wave winding shape shown in FIG. 4 before assembling the tooth portion 13B to the core body 13A. The phase winding (hereinafter referred to as a wave winding coil) formed in the wave winding shape shown in FIG. 4 is obtained by taking out the Z phase shown in FIGS. 2 and 3, for example, but the X phase and the Y phase. Is a wave winding coil of the same shape. 2 and 3 show one wave-wound coil of each phase, but actually, a plurality of pieces (for example, four pieces as shown in FIG. 7) are stored in the same slot s. .
This wave-wound coil has a conductor portion (14a, 14b, 14c) in the slot shown in FIG. And a circumferential crossover portion (14d, 14e) that are connected to each other.

The in-slot conductor portion includes an outer slot inner conductor portion 14a accommodated in the outer slot s1, an inner slot inner conductor portion 14b accommodated in the inner slot s2, and an outer slot inner conductor portion 14a accommodated in the side slot s3. A side slot inner conductor portion 14c that connects the inner slot inner conductor portion 14b is formed into a U-shaped cross section.
The circumferential crossover portion 14d is an outer circumferential crossover portion 14d that connects one outer slot inner conductor portion 14a and the other outer slot inner conductor portion 14a adjacent to each other with a magnetic pole pitch in the circumferential direction on one end side in the axial direction. And an inner circumferential crossing portion 14e that connects one inner slot conductor portion 14b and the other inner slot conductor portion 14b adjacent to each other with a magnetic pole pitch in the circumferential direction on one end side in the axial direction. However, the outer circumferential crossover portion 14d and the inner circumferential crossover portion 14e are formed on the opposite side in the circumferential direction with respect to the in-slot conductor portions 14a and 14b.

Next, a vehicle start mode and a braking mode will be described as typical examples of the operation of the motor 1.
a) Starting Mode When the vehicle is started, DC power obtained from a vehicle battery (not shown) is AC converted by an inverter and supplied to the stator coil 14. At this time, the magnetic pole position of the rotor R is detected by a rotation angle sensor (not shown) such as a resolver, and the stator R is positioned at a position where the two magnetic fields of the rotor R and the stator S have a relative difference of about 90 degrees in electrical angle. When current is supplied to the coil 14, torque is generated in the motor 1. At this time, by connecting the multi-plate clutch 9 shown in FIG. 1 and connecting the rotor R and the motor shaft 8, the motor torque becomes the torque for starting the engine.
The motor 1 also applies torque to the TM shaft 5 to which the rotor R is connected, and supplies the starting torque of the vehicle until the engine reaches a complete explosion. Thus, the operation of starting and starting the vehicle while starting the engine using the motor 1 is the same operation as the motor in a normal hybrid vehicle.

b) Braking mode The operation when starting braking from high-speed running will be described.
In this case, regenerative braking is performed by operating the motor 1 as a generator. That is, the running kinetic energy of the vehicle is recovered in the vehicle battery as power energy by the power generation of the motor 1 (generator). In this braking mode, in order to disconnect the engine having a large mechanical loss from the motor 1, the multi-plate clutch 9 is disconnected and the engine is quickly stopped. That is, when entering the braking mode, the kinetic energy can be efficiently recovered as electric power energy by disengaging the multi-plate clutch 9. As described above, the operation for regenerative braking of the vehicle using the motor 1 is the same operation as the motor in a normal hybrid vehicle.

(Operation and Effect of Example 1)
In the motor 1 of the first embodiment, a stator core 13 is disposed in a U-shaped space of the rotor R, and a stator coil 14 is wound around the stator core 13 in a U-shaped cross section. According to this configuration, when compared with the rotating electrical machine of Patent Document 1, the winding length of the stator coil 14 can be shortened under the condition that the overall rating of the motor 1 is restricted. Loss can be reduced.
The stator core 13 around which the stator coil 14 is wound has, for example, an annular shape that can be called a torus shape, and has a simple structure as compared with the U-shaped stator core described in Patent Document 1. Thereby, compared with patent document 1, since the flow of magnetic flux is simple and distance becomes short, magnetic resistance reduces. As a result, a larger torque can be obtained when excitation is performed with the same drive current, so that a small and high-performance motor 1 can be provided.

Furthermore, since the stator core 13 is divided into the core main body 13A and the tooth portion 13B, the stator coil 14 is previously formed into the shape of the wave winding coil shown in FIG. 4, and the tooth portion 13B is assembled to the core main body 13A. Before, the wave winding coil can be wound around the core body 13A. That is, after winding the wave winding coils of each phase around the core body 13A, as shown in FIG. 2, the teeth part 13B is fitted into the teeth groove 13a of the core body 13A, and the teeth part 13B is assembled to the core body 13A. Therefore, the stator coil 14 can be easily wound.
Further, in the motor 1 of the first embodiment, the annular stator core 13 is disposed in the inner space of the rotor core 2 having a U-shaped cross section, but covers the patent document 1 described in the “Background Art” section. Thus, the coil end of the stator S does not interfere with the rotor disk 4 that supports the rotor core 2, and the stack thickness of the stator core 13 is not limited.

Hereinafter, other examples (Examples 2 to 6) according to the present invention will be described.
Note that parts, functions, shapes, and the like described with the same names as in the first embodiment are given the same numbers as in the first embodiment, and redundant descriptions are omitted.
(Example 2)
The second embodiment is an example in which the flange portion 13 b is provided on the teeth portion 13 </ b> B of the stator core 13. As shown in FIG. 5, the teeth portion 13 </ b> B includes a laminated sheet body 13 c configured by laminating a plurality of teeth plates punched out into a U-shape by pressing, and both outer sides in the laminating direction of the laminated sheet body 13 c. And a pair of support plates 13d. The accessory plate 13d is formed in a U-shape whose outer shape is larger than that of the tooth plate. That is, the dimension in the width direction orthogonal to the plate thickness direction of the attachment plate 13d is formed larger toward the outer shape side, and the large formed portion is bent at a right angle to the outside in the lamination direction (on the anti-lamination sheet body side). Is forming.

Further, the anchor plate 13d is provided with an anchor portion 13e on the inner side in the width direction of the portion fitted in the tooth groove 13a of the core body 13A. The anchor portion 13e is formed by bending a part of the inner side in the width direction of the attachment plate 13d at a right angle toward the anti-laminated sheet body, similarly to the flange portion 13b, and when the teeth portion 13B is assembled to the core body 13A, It is inserted into an anchor locking groove (not shown) formed in 13A.
Since the tooth portion 13B shown in the second embodiment has the flange portion 13b on the surface facing the rotor R, the gap area is increased as compared with the teeth portion 13B that does not have the flange portion 13b. In this case, it is effective in improving the magnetic characteristics and contributes to the realization of a small and high-performance motor 1.

The anchor portion 13e has a function to securely fix the teeth portion 13B to the core body 13A by being inserted into the anchor locking groove of the core body 13A when the teeth portion 13B is assembled to the core body 13A. Fulfill. However, the feature of the second embodiment is that the brim portion 13b is provided in the teeth portion 13B, and it is not essential to provide the anchor portion 13e.
As another example of the second embodiment, as shown in FIG. 6, a plurality of slits 13 f or notches may be formed in the flange portion 13 b of the teeth portion 13 </ b> B. In this case, even if the magnetism of the rotor R changes suddenly with respect to the tooth portion 13B, there is an effect of suppressing the eddy current loss that occurs, which contributes to the realization of a small and high-performance motor 1.

Example 3
The third embodiment is an example in which a plurality of teeth portions 13B assembled to the core body 13A of the stator core 13 are connected in a ring shape.
As shown in FIG. 7A, the plurality of teeth portions 13B are formed in a ring shape as a whole in a state where the flange portions 13b described in the second embodiment are connected in the circumferential direction, for example. 7A is a cross-sectional view in which a part of the circumferential direction of the stator S is developed linearly, and FIG. 7B is a cross-sectional view taken along the line VII-VII in FIG.
According to said structure, since the some teeth part 13B is connected in the circumferential direction by connecting each collar part 13b, the effect of mutually fixing and supporting with respect to each magnetic force is produced. As a result, the problem of instability of magnetic deformation and noise are suppressed even when the magnetic flux density is high.

In addition, since the plurality of tooth portions 13B are connected in the circumferential direction and formed in a ring shape as a whole, assembly to the core body 13A is also easy. That is, when the plurality of teeth portions 13B are not connected in the circumferential direction, the plurality of teeth portions 13B need to be assembled to the core body 13A one by one, whereas in the configuration of the third embodiment, they are connected in a ring shape. The plurality of teeth portions 13B thus made can be assembled at a time.
The plurality of tooth portions 13B are connected to each other by the flange portions 13b adjacent to each other in the circumferential direction, so that when the plurality of teeth portions 13B connected in a ring shape are assembled to the core body 13A, the closed slots s are formed. However, before the teeth portion 13B is assembled to the core body 13A, the wave coils of each phase are assembled to the core body 13A in advance, so that the stator coil 14 can be wound even in the closed slot s. There will be no trouble.

Example 4
The fourth embodiment is an example of the axial gap type motor 1 in which the magnetic pole surface of the rotor R and the magnetic pole surface of the stator S face each other with a magnetic gap in the axial direction.
As shown in FIG. 8, the stator S includes a disk-shaped stator core 13 whose outer peripheral side in the radial direction is fixed to the motor housing 16 via the stator holder 15, and a stator coil 14 wound around the stator core 13. Is done.
The stator core 13 is formed in an annular shape in which the radially inner peripheral side opens in a circular shape, and a plurality of slots s are radially formed on both side surfaces in the axial direction along the radial direction. The stator core 13 may be formed by laminating electromagnetic steel plates punched into a predetermined shape with a press in the same manner as in the first embodiment. For example, the stator core 13 is compressed by mixing a resin compound with metal magnetic powder such as iron powder. It can also be formed by a molded powder magnetic core.

As in the first embodiment, the stator coil 14 is a three-phase winding that is star-connected, and each phase winding is wave-wound around the stator core 13 with an electrical angle π as a winding pitch. The terminal is connected to an external inverter (not shown).
As shown in FIG. 8, each phase of the wave winding coil is adjacent to the in-slot conductor portion 14 f housed in the slot s of the stator core 13 and the magnetic pole pitch (electrical angle π) in the circumferential direction of the stator core 13. A circumferential crossover portion (not shown) that connects the outer peripheral ends of the matching in-slot conductor portions 14f along the circumferential direction, and an axial crossover portion 14g that connects the inner peripheral ends of the in-slot conductor portions 14f in the axial direction. And is wound around the stator core 13 in a U-shaped cross section (in FIG. 8, a U-shape and an inverted U-shape).

  The rotor R has a pair of disk-shaped rotor cores 2d disposed on both sides in the axial direction of the stator core 13 via magnetic gaps. Is assembled. In this rotor R, a pair of disk-shaped rotor cores 2d are fitted to the outer periphery of the shaft 17 so as to be rotatable integrally with the shaft 17, and the shaft 17 is rotatably supported by the motor housing 16 via a bearing 18. Has been.

  In the axial gap motor 1 described above, the inner diameter side coil end of the stator coil 14 is formed by the axially extending portion 14g, and the coil does not cross in the circumferential direction unlike the coil end of the conventional motor. Is not overcrowded. Thereby, the radial position of the inner diameter side coil end can be placed on the smaller diameter side. In other words, the air gap area increases because the inner diameter side of the doughnut-shaped air gap surface between the stator S and the rotor R contracts. That is, since the coil configuration is simple, the inner area can be secured to a small diameter position, and the stator coil 14 is arranged in a small manner in the center, so that it has a large gap area and low resistance, and is small and has high performance. The motor 1 can be realized.

(Example 5)
The fifth embodiment is an example in which rotor magnetic poles are also arranged on the inner diameter side of the stator S described in the fourth embodiment. That is, as shown in FIG. 9, the rotor R has an intermediate rotor core 2 e disposed on the radially inner peripheral side of the stator core 13 via a magnetic gap, and the permanent magnet 3 is disposed on the outer peripheral surface of the intermediate rotor core 2 e. It is assembled.
Further, the pair of disk-like rotor cores 2d described in the fourth embodiment are connected via an intermediate rotor core 2e, and the entire rotor core 2 is formed in a U-shaped cross section (in FIG. 9, a U shape and an inverted U shape). Yes.

Here, when the slots s formed on both side surfaces of the stator core 13, that is, the slots s for accommodating the in-slot conductor portions 14f described in the fourth embodiment are referred to as radial slots s4, the radially inner circumferential surface of the stator core 13 is referred to. Is formed with an axial slot s5 communicating with the radial slot s4, and the axial crossing portion 14g described in the fourth embodiment is accommodated in the axial slot s5.
In the motor 1 shown in the fifth embodiment, since the magnetic gap between the stator S and the rotor R can be formed over three surfaces by arranging the rotor magnetic poles on the inner diameter side of the stator S, the motor 1 is small and has a larger torque. It is possible to obtain

(Example 6)
The sixth embodiment is an example in which the stator coil 14 is overlapped as shown in FIG. By winding the stator coil 14 in a U-shaped cross section around the core body 13A, the stator coil 14 can be unitized for each magnetic pole and assembled to the core body 13A. Therefore, there is an advantage that the coil can be easily arranged and attached.

(Modification)
The motor 1 described in the first embodiment includes a side rotor core 2c having a side magnet 3c attached to the surface thereof, that is, a three-surface gap between the rotor R and the stator S. For example, the side rotor core 2c Can be abolished to form a two-sided gap structure. In this case, the outer rotor core 2a and the inner rotor core 2b can be connected to each other by a rotor connecting portion formed of a nonmagnetic metal such as aluminum to form a U-shaped rotor shape.
The motor 1 of the first embodiment uses the surface magnet type rotor R in which the permanent magnet 3 is attached to the surface of the rotor core 2, but is not limited to the surface magnet type rotor R. For example, an embedded magnet rotor in which the permanent magnet 3 is embedded near the surface of the rotor core 2, a cage rotor used for an induction motor, a salient pole rotor used for a reluctance motor, or the like may be used.
Further, the stator core 13 described in the first embodiment is provided with the core body 13A and the teeth portion 13B as separate bodies, but the stator core 13 in which the teeth portion 13B is provided integrally with the core body 13A can also be used.

1 Motor (Rotating electric machine)
2a Outer rotor core 2b Inner rotor core 2c Side rotor core 2d Disc-shaped rotor core 12 Transmission housing 13 Stator core 13A Core body 13B Teeth portion 13a Teeth groove 13b Hook portion 14 Stator coil 16 Motor housing S Stator R Rotor s Slot

Claims (8)

A stator (S) having an annular stator core (13) whose one end in the axial direction is fixed to the housing (12), and a stator coil (14) wound around the stator core (13);
The stator core (13) has an outer rotor core (2a) and an inner rotor core (2b) disposed at least on the outer side and the inner side in the radial direction via magnetic gaps, respectively, and the outer rotor core (2a) and the inner side A rotor (R) having a U-shaped cross section having a rotor connecting portion for connecting the rotor core (2b) on the other end side in the axial direction ;
The stator core (13) has a plurality of slots (s) at equal circumferential pitches along the axial direction on the outer peripheral surface facing the outer rotor core (2a) and the inner peripheral surface facing the inner rotor core (2b). Formed,
Said stator coil (14) is a plurality of slots (s) wound on the cross-sectional U-shape in the stator core (13) through a by Ru rotary electric machine (1),
The stator core (13) includes a ring-shaped core body (13A) forming a stator yoke, and a plurality of teeth (13B) provided separately from the core body (13A), and the core body In (13A), a plurality of teeth grooves (13a) are formed on the outer peripheral surface and the inner peripheral surface in the radial direction at equal pitches in the circumferential direction along the axial direction.
The teeth portion (13B) is provided with a U-shaped cross section, and is fitted into the tooth groove (13a) from the other axial end of the core body (13A) and assembled to the core body (13A). The rotary electric machine is characterized in that the slot (s) is formed between the teeth portions (13B) adjacent to each other in the circumferential direction of the stator core (13) . In the rotating electrical machine (1) according to claim 1,
The rotor (R) is configured as a side rotor core (2c) in which the rotor connecting portion is disposed on the other axial end side of the stator core (13) via a magnetic gap.
The slot (s) formed on the outer peripheral surface of the stator core (13) is called an outer slot (s1), and the slot (s) formed on the inner peripheral surface of the stator core (13) is an inner slot (s2). When calling
The stator core (13) has a plurality of side slots (s3) in the circumferential direction that communicates the outer slot (s1) and the inner slot (s2) in the radial direction on an axial end face facing the side rotor core (2c). Formed at an equal pitch,
The stator coil (14) is wound around the stator core (13) in a U-shape through the outer slot (s1), the inner slot (s2) and the side slot (s3). Rotating electric machine. In the rotating electrical machine (1) according to claim 1 or 2 ,
The teeth portion (13B) includes a laminated sheet body (13c) configured by laminating a plurality of tooth plates, and a pair of auxiliary plates (externally disposed in the laminating direction of the laminated sheet body (13c)). 13d), and the attachment plate (13d) has a flange portion (13b) formed by bending an outer peripheral portion having a U-shaped cross section outward in the stacking direction. In the rotating electrical machine (1) according to claim 3 ,
A rotating electric machine characterized in that a plurality of slits (13f) or notches are formed in a flange (13b) provided on the attachment plate (13d). In the rotating electrical machine (1) according to claim 3 or 4 ,
The one teeth portion (13B) and the other teeth portion (13B) adjacent to each other in the circumferential direction of the stator core (13) are arranged so that the flange portions (13b) provided on the attachment plate (13d) of each other are circumferential. A rotating electrical machine characterized in that a plurality of teeth portions (13B) that are connected to each other and assembled to the core body (13A) are connected in a ring shape as a whole. The outer peripheral side in the radial direction orthogonal to the axial direction is fixed to the housing (16), and has a disk-shaped stator core (13) opened on the inner peripheral side, and a stator coil (14) wound around the stator core (13). A stator (S);
A rotary electric machine (1) having an axial gap structure including a rotor (R) having a pair of disk-shaped rotor cores (2d) disposed on at least both axial sides of the stator core (13) via magnetic gaps. ,
The stator core (13) has a plurality of slots (s) formed at equal pitches along the radial direction on both side surfaces in the axial direction facing the pair of disk-shaped rotor cores (2d), and the stator coil (14) is a rotating electrical machine wherein the stator core (13) is wound in a U-shaped cross section through the plurality of slots (s). In the rotating electrical machine (1) according to claim 6 ,
The rotor (R) has an intermediate rotor core (2e) disposed via a magnetic gap on the radially inner peripheral side of the stator core (13), and the set of the set via the intermediate rotor core (2e). The disk-shaped rotor core (2d) is connected and provided in a U-shaped cross section,
When the slots (s) formed on both side surfaces of the stator core (13) are called radial slots (s4),
The stator core (13) is formed with a plurality of axial slots (s5) extending in the axial direction in communication with the radial slots (s4) on a radially inner circumferential surface facing the intermediate rotor core (2e).
The rotating electrical machine, wherein the stator coil (14) is wound in a U-shaped cross section around the stator core (13) through the radial slot (s4) and the axial slot (s5). In the rotary electric machine (1) according to any one of claims 1 to 7 ,
A rotating electric machine characterized in that the stator coil (14) is lap-wound.

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