JP2018166354A - Axial gap type motor and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an axial gap-type motor which can integrally and easily manufacture a core and a back yoke and can reduce manufacture cost in the axial gap-type motor and to provide a manufacturing method of the motor.SOLUTION: In an axial gap-type motor, a stator 2 comprises: a core 7 with yoke, which has an annular back yoke 8 which is concentric with a rotation axis of a rotor, and a plurality of magnetic pole cores 9 protruded in an axial direction from the back yoke 8; and coils wound to the respective magnetic pole cores 9. In the core 7 with yoke, a plurality of core pieces 7A with yoke parts, which have two magnetic pole core half parts 9a divided at the middle of width in a rotor circumferential direction of the respective magnetic pole cores 9 in the two adjacent magnetic pole cores 9 and 9 and back yoke parts 7Ab which integrally connect the magnetic pole core half parts 9a are arranged in the circumferential direction. The core piece 7A with yoke part is formed of a laminated steel plate where a plurality of planar steel plates are laminated in a radial direction of the rotation axis.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an axial gap type motor used for various devices such as an electric brake device and a method for manufacturing the same.

The following proposals have been made for electric motors.
1. An electric brake device using a motor and a linear motion mechanism (Patent Document 1).
2. An electric brake device provided with an axial gap type motor in which an electric motor is arranged on a parallel axis different from the rotation axis of the linear motion mechanism (Patent Document 2).

JP-A-6-327190 Japanese Patent Laid-Open No. 11-356016

In the electric brake device described in Patent Document 1, a compact and highly responsive actuator is desired.
As an electric motor structure that enables high torque while saving space, for example, an axial gap type motor as shown in Document 2 is known. However, compared with a radial gap type motor in which a magnetic circuit is formed on a flat surface, an axial gap type motor has a three-dimensional magnetic circuit, which makes it difficult to manufacture an iron core used for an excitation circuit and increases manufacturing costs. There is. In particular, when the core portion and the back yoke portion are separately manufactured and connected by welding or the like, there is a concern that the laminated core may be peeled off. On the other hand, it is very difficult to form the core part and the back yoke part integrally because of its shape.

  In addition, in the case of an axial gap type motor, it is necessary to provide a slot (a notch in the core portion) for winding the winding in parallel with the radial direction. That is, the width of the core portion is smaller on the inner diameter side and larger on the outer diameter side. On the other hand, the core portion needs to be laminated with steel plates parallel to the direction in which the magnetic flux passes. If the core portion is manufactured by laminating steel plates in the motor radial direction, the gap between the core portion and the winding becomes large in a single shape, and the motor performance decreases. In addition, when the core part is formed by laminating and forming steel plates that gradually become wider in the radial direction, it is necessary to manage multiple types of parts and to ensure multiple types of parts with desired dimensional accuracy. There is a high possibility that the manufacturing cost will increase due to some problems.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an axial gap type motor and a method for manufacturing the same, in which a core and a back yoke can be easily and integrally manufactured in an axial gap type motor, and the manufacturing cost can be reduced. is there.

The axial gap type motor of the present invention is an axial gap type in which a stator and a rotor rotatable with respect to the stator face each other in the axial direction of the rotor, and the stator is concentric with the rotating shaft of the rotor. A back yoke, a core with a yoke having a plurality of magnetic pole cores projecting in the axial direction from a plurality of circumferential locations on the side surface of the back yoke, and an axial gap each including a coil wound around each of the magnetic pole cores Type motor,
The core with yoke includes two magnetic pole core halves that are divided in the middle of the width in the rotor circumferential direction of each magnetic pole core in two adjacent magnetic pole cores, and a back yoke portion that integrally connects the magnetic pole core halves. A plurality of core pieces with yoke portions are arranged in the circumferential direction, and the core pieces with yoke portions are made of laminated steel plates in which a plurality of flat steel plates are laminated in the radial direction of the rotating shaft.

  According to this configuration, the core with yoke is divided into two magnetic pole core halves divided in the middle of the width of each magnetic pole core in the adjacent two magnetic pole cores, and these magnetic pole core halves are integrated with each other. A plurality of core pieces with yoke portions having back yoke portions to be connected are provided. Since the back yoke portion integrally connects the two magnetic pole core halves, for example, the manufacturing can be simplified and the cost can be reduced as compared with the conventional example in which the core portion and the back yoke portion are separately manufactured and connected by welding or the like.

  The core with yoke is composed of a plurality of core pieces with yoke portions arranged in the circumferential direction, and the core pieces with yoke portions are laminated steel plates in which a plurality of flat steel plates are laminated in the radial direction of the rotating shaft. Consists of. For this reason, for example, an axial gap motor can be easily manufactured only by arranging and joining a plurality of core pieces with yoke portions formed by cutting laminated steel plates in the circumferential direction. In this case, for example, it is possible to omit the trouble of managing a plurality of types of parts, such as the conventional example of laminating and forming steel plates that gradually widen in the radial direction in the core portion, and each of the plurality of types of parts can be obtained as desired. There is no need to ensure dimensional accuracy. Therefore, the manufacturing cost can be significantly reduced as compared with the conventional example.

  Each of the core pieces with yoke portions may be a laminated body of steel plates having the same shape. In this case, the core pieces with yoke portions can be easily manufactured by stacking steel plates having the same shape. Therefore, it is possible to reduce the manufacturing cost by reducing the types of parts compared to the conventional example.

An axial gap type motor manufacturing method according to the present invention is an axial gap type in which a stator and a rotor rotatable with respect to the stator face each other in the axial direction of the rotor, and the stator includes a rotation shaft of the rotor. A concentric and annular back yoke, a core with a yoke having a plurality of magnetic pole cores projecting in the axial direction from a plurality of circumferential positions on the side surface of the back yoke, and a coil wound around each of the magnetic pole cores. In a manufacturing method for manufacturing an axial gap type motor,
Steel plate preparation process of preparing a plurality of strip-shaped steel plates having a plurality of protruding pieces protruding in a comb-teeth shape,
A laminating process in which a plurality of the strip-shaped steel plates are laminated so that the protruding pieces overlap to form an elongated laminated steel plate;
Cutting the laminated steel sheet in the steel sheet thickness direction as a cutting surface inclined with respect to the protruding direction of the protruding piece at the location of each protruding piece, and cutting surfaces alternately inclined with respect to the longitudinal direction of the laminated steel sheet A cutting process of forming a plurality of core pieces with a yoke part having two magnetic pole core halves and a back yoke part integrally connecting the magnetic pole core halves;
The plurality of core pieces with yoke portions have a joining process in which the cores with yokes are formed by joining in an annular shape so that the magnetic pole core halves are adjacent to each other in the circumferential direction.

  According to this configuration, in the steel plate preparation process, a plurality of strip-shaped steel plates having a plurality of protruding pieces protruding in a comb shape are prepared. Next, in the laminating process, a plurality of belt-shaped steel plates are laminated so that the protruding pieces overlap each other to form an elongated laminated steel plate. In the cutting process, the laminated steel plate is cut in the thickness direction of the steel plate as a cut surface inclined with respect to the protruding direction of the protruding piece at each protruding piece. As a result, a plurality of core pieces with yoke portions having two magnetic pole core halves having cut surfaces alternately inclined with respect to the longitudinal direction of the laminated steel plates and a back yoke portion integrally connecting these magnetic pole core halves are formed. To do. Thereafter, in the joining process, the core pieces with yoke portions are joined in an annular shape so that the magnetic pole core halves are adjacent to each other in the circumferential direction.

Thus, with respect to the plurality of core pieces with yoke portions formed by cutting the above-mentioned laminated steel plates, it is only necessary to form a yoke-attached core by joining the magnetic pole core halves in an annular shape so that they are adjacent to each other in the circumferential direction. An axial gap motor can be easily manufactured.
In particular, in the cutting process, a core piece with a yoke portion having two magnetic pole core halves having cutting surfaces alternately inclined with respect to the longitudinal direction of the laminated steel plates and a back yoke portion integrally connecting the magnetic pole core halves. By forming a plurality of cores, the cores with yokes can be formed by joining in an annular shape so that the magnetic pole core halves are adjacent in the circumferential direction. Thereby, the core with a yoke can be formed without wasting a steel plate as a material and without adding other components. Therefore, the yield can be improved and the manufacturing cost can be reduced.
In this case, for example, it is possible to omit the trouble of managing a plurality of types of parts, such as the conventional example of laminating and forming steel plates that gradually widen in the radial direction in the core portion, and each of the plurality of types of parts can be obtained as desired. There is no need to ensure dimensional accuracy. Therefore, the manufacturing cost can be significantly reduced as compared with the conventional example.

In the cutting process, a plurality of parallel cut surfaces may be simultaneously cut among the cut surfaces alternately inclined with respect to the longitudinal direction of the laminated steel plate. Thus, the cycle time can be reduced by simultaneously cutting (in one step) a plurality of parallel cut surfaces.
In the cutting process, the laminated steel sheets may be cut by wire cutting or laser to form a plurality of core pieces with yoke portions.

  The axial gap type motor of the present invention is an axial gap type in which a stator and a rotor rotatable with respect to the stator face each other in the axial direction of the rotor, and the stator is concentric with the rotating shaft of the rotor. A back yoke, a core with a yoke having a plurality of magnetic pole cores projecting in the axial direction from a plurality of circumferential locations on the side surface of the back yoke, and an axial gap each including a coil wound around each of the magnetic pole cores In the type motor, the core with yoke is integrated with two magnetic pole core halves divided in the middle of the width of each magnetic pole core in the adjacent two magnetic pole cores, and these magnetic pole core halves. A plurality of core pieces with yoke portions having back yoke portions to be connected are arranged in the circumferential direction, and the core pieces with yoke portions are arranged. , A laminated steel plate flat steel plates of a plurality in the radial direction of the rotary shaft are stacked. For this reason, a core and a back yoke can be manufactured integrally and easily, and reduction of manufacturing cost can be aimed at.

  An axial gap type motor manufacturing method according to the present invention is an axial gap type in which a stator and a rotor rotatable with respect to the stator face each other in the axial direction of the rotor, and the stator includes a rotation shaft of the rotor. A concentric and annular back yoke, a core with a yoke having a plurality of magnetic pole cores projecting in the axial direction from a plurality of circumferential positions on the side surface of the back yoke, and a coil wound around each of the magnetic pole cores. In the manufacturing method of manufacturing an axial gap type motor, a steel plate preparation process for preparing a plurality of strip-shaped steel plates having a plurality of projecting pieces protruding in a comb shape, and the strip-shaped steel plates so that the projecting pieces overlap each other. A laminating process in which a plurality of sheets are laminated to form an elongated laminated steel sheet, and the laminated steel sheet is inclined with respect to the projecting direction of the projecting piece at each projecting piece. Two magnetic pole core halves having cut surfaces alternately cut with respect to the longitudinal direction of the laminated steel sheet, and a back yoke portion integrally connecting the magnetic pole core halves, cut in the steel sheet thickness direction as a cross section A cutting process for forming a plurality of core pieces with a yoke portion, and a plurality of the core pieces with a yoke portion are joined in an annular shape so that the magnetic pole core halves are adjacent to each other in the circumferential direction, thereby forming the core with a yoke. Joining process. For this reason, a core and a back yoke can be manufactured integrally and easily, and reduction of manufacturing cost can be aimed at.

1 is a cross-sectional view of an axial gap type motor according to an embodiment of the present invention. It is a perspective view of the core with a yoke of the motor. It is a perspective view of the steel plate of the steel plate preparation process in the manufacturing process of the motor. It is a perspective view of the laminated steel plate of the lamination process in the manufacturing process. It is a perspective view of the laminated steel plate of the cutting process in the manufacturing process. It is a perspective view of the laminated steel plate of another cutting process in the manufacturing process. It is a perspective view of the core piece with a yoke part after the cutting process in the manufacturing process. (A) is the front view which shows the components which comprise the housing of the motor from the inside, (B) is VIIIB-VIIIB sectional drawing of the figure (A). It is a perspective view which shows the stator containing the core with a yoke and a coil, and the core piece with a yoke part which comprises the part. It is a perspective view which shows the state which inserted the stator in the components which comprise the housing. It is sectional drawing which shows the linear motion actuator using the motor.

An axial gap type motor according to an embodiment of the present invention will be described with reference to FIGS. The following description also includes a description of a method for manufacturing an axial gap type motor.
<Overall structure of axial gap type motor>
As shown in FIG. 1, the axial gap type motor M includes a housing 1, a stator 2, and a rotor 3. This axial gap type motor M is an axial gap type in which the stator 2 and the rotor 3 face each other in the axial direction of the rotor 3. The stator 2 is statically held by the housing 1. The rotor 3 is supported rotatably with respect to the stator 2. A rotating shaft 5 is rotatably supported on the housing 1 via a bearing 4, and the rotor 3 is fixed to the outer periphery of the rotating shaft 5.

  The housing 1 includes a plurality of divided housings 1A and 1B, and a stator 2 is installed in one of the divided housings 1A. The other divided housing 1B also serves as a housing for the motor-using device 6, and a part thereof becomes a motor housing. The motor using device 6 includes, for example, a linear actuator described later.

  The axial gap type motor M is a permanent magnet type synchronous motor, and the stator 2 is an excitation mechanism for an assembly part having a core 7 with a yoke and a coil 10. The rotor 3 is formed by embedding a plurality of permanent magnets 3a arranged in the circumferential direction in a disk-shaped magnetic body 3b. The rotor 3 may be entirely made of a magnetic material. In this case, the rotor 3 is a reluctance type synchronous motor.

<About the structure of the stator 2>
As shown in FIG. 2, the yoked core 7 in the stator 2 includes an annular back yoke 8 and a plurality of magnetic pole cores 9.
As shown in FIGS. 1 and 2, the back yoke 8 is provided in a ring shape concentrically with the rotation axis O of the rotor 3 and has a flat plate shape perpendicular to the rotation axis O. The back yoke 8 forms a magnetic circuit parallel to the rotation plane of the rotation shaft 5. As will be described later, the front shape of the back yoke 8 is a polygonal annular shape so that it can be easily positioned on the divided housing 1A. The magnetic pole core 9 projects in the axial direction from a plurality of circumferential positions on the side surface of the back yoke 8 to form a magnetic pole.

  The coil 10 is one in which a conducting wire is wound around each magnetic pole core 9, and the coil 10 wound around the magnetic pole core 9 converts one current of the conducting wire into an interlinkage magnetic flux. An individual excitation mechanism is configured. As the conducting wire of the coil 10, a covered conducting wire (see FIG. 9) having a rectangular cross section is used, and is wound around the outer periphery of the magnetic pole core 9 in a single line along the protruding direction via a coil bobbin (not shown).

  The winding of the conducting wire may be single, or the conducting wire may be a covered conducting wire having a circular cross section, and may be wound in multiple turns on the coil bobbin that fits on the outer periphery of each magnetic pole core 9. The conducting wire may be wound around the coil bobbin fitted to the outer periphery of each magnetic pole core 9, or may be wound directly through insulating paper or the like and fixed by a varnish or a mold.

  As shown in FIG. 2, a plurality of magnetic pole cores 9 are arranged at equal intervals in the circumferential direction, and the front shape of each magnetic pole core 9 viewed from the axial direction is a fan shape. The number of magnetic pole cores 9 is an integral multiple of the number of phases of the alternating current to be applied. Since the axial gap type motor M in this example is a three-phase motor, the number of phases is “3”.

  In the axial gap type motor M having the above basic configuration, in this embodiment, the core 7 with yoke is composed of a plurality of core pieces 7A with yoke portions (see FIGS. 7 and 9) arranged in the circumferential direction. The partial core piece 7 </ b> A (simply referred to as “core piece 7 </ b> A” in some cases) is made of a laminated steel plate 11 in which a plurality of flat steel plates 11 a are laminated in the radial direction of the rotating shaft 5. Each core piece 7A is a laminate of steel plates 11a having the same shape.

  Each core piece 7A includes two magnetic pole core halves 9a and 9a and a back yoke portion 7Ab that integrally connects the magnetic pole core halves 9a and 9a. The two magnetic pole core halves 9a and 9a are divided at the middle of the width in the rotor circumferential direction of each magnetic core 9 in the two magnetic pole cores 9 and 9 adjacent to each other in the circumferential direction. Each core piece 7A forms a groove shape with the two magnetic pole core halves 9a, 9a and the back yoke portion 7Ab. This groove shape becomes a notch through which the coil winding passes. The two magnetic pole core halves 9a, 9a adjacent to each other of the two adjacent core pieces 7A constitute the magnetic pole core 9 having a fan-shaped front shape.

  Each magnetic pole half half 9a in each core piece 7A becomes narrower as it reaches the radially inner side of the rotating shaft 5 (FIG. 1). For this reason, the width dimension of each laminated steel plate 11a differs. For example, the magnetic pole core half 9a having the above-described shape can be manufactured by laminating steel plates having the same shape and then performing oblique cutting (described later).

<Manufacturing process of core 7 with yoke>
The manufacturing method of the core 7 with a yoke is demonstrated with FIGS. The manufacturing method sequentially includes a steel plate preparation process shown in FIG. 3, a lamination process shown in FIG. 4, a cutting process shown in FIGS. 5 to 7, and a joining process shown in FIG.
In the steel plate preparation process shown in FIG. 3, a plurality of strip-shaped steel plates Wa are prepared. This strip-shaped steel plate Wa has a plurality of protruding pieces 13 protruding in a comb shape. These protruding pieces 13 are provided at one side edge of the steel plate Wa by pressing or the like at regular intervals in the longitudinal direction.

  Next, in the laminating process shown in FIG. 4, a plurality of belt-shaped steel plates Wa are laminated so that the protruding pieces 13 overlap each other to form an elongated laminated steel plate W. In the cutting process shown in FIGS. 5 and 6, the laminated steel sheet W is cut obliquely. That is, the laminated steel sheet W is cut in the steel sheet thickness direction as the cutting surface 14 inclined with respect to the protruding direction of the protruding piece 13 at each protruding piece 13, and alternately inclined with respect to the longitudinal direction of the laminated steel sheet W. A plurality of core pieces 7A with yoke portions having two magnetic pole core halves 9a, 9a having a cut surface 14 and a back yoke portion 7Ab integrally connecting these magnetic pole core halves 9a, 9a are formed.

  The inclination angle θ of each cut surface 14 is an inclination angle θ with respect to a plane (reference plane) S including the protruding direction of the protruding piece 13 and the stacking direction of the steel plates Wa. The inclination angle θ is an angle obtained by dividing 180 ° by the number of slots (core part notches) n as follows (however, the sign of positive / negative is ignored). θ = 180 / n. In this cutting process, a plurality of parallel cut surfaces 14 are simultaneously cut out of the cut surfaces 14 that alternately incline the laminated steel sheet W with respect to the longitudinal direction.

In the example of FIG. 5, there are ten parallel cut surfaces 14, and these parallel cut surfaces 14 are cut simultaneously. As a cutting method, wire cutting, laser, or the like can be employed. The inclination angle θ of the cut surface 14 in FIG. 5 is about + 20 ° with respect to the reference plane S, for example. In the example of FIG. 6, there are 10 parallel cut surfaces 14, and these parallel cut surfaces 14 are cut simultaneously. The inclination angle θ of the cut surface 14 in FIG. 6 is about −20 ° with respect to the reference plane S, for example. Therefore, a plurality of core pieces 7A with yoke portions shown in FIG. 7 can be formed.
In the joining process shown in FIG. 2, the yoked core 7 is formed by joining the core pieces 7 </ b> A with a yoke portion in an annular shape so that the magnetic pole core halves 9 a are adjacent to each other in the circumferential direction.

<Example of assembly of excitation mechanism>
As shown in FIGS. 8A and 8B, a polygonal fitting groove 12 into which the outer peripheral surface of the back yoke 8 (FIG. 1) is fitted is provided on the bottom surface of the divided housing 1A. With this fitting groove 12, as shown in FIGS. 9 and 10, when the excitation mechanism is assembled, the excitation mechanism can be positioned relatively easily with respect to the divided housing 1A.

  The divided housing 1A may be a resin molded product such as PBT, or may be a metal member. When the divided housing 1A is made of a resin member, for example, a bus bar for wiring or the like may be insert-molded. When the divided housing 1A is made of a metal material, it may be a magnetic body such as iron or a nonmagnetic material such as aluminum or stainless steel. Further, the divided housing 1A may be formed of a resin member, and a metal case such as aluminum may be separately provided and combined.

<Effect>
According to the axial gap type motor M described above, the back yoke portion 7Ab integrally connects the two magnetic pole core halves 9a and 9a. For example, the core portion and the back yoke portion are separately manufactured and connected by welding or the like. Compared to the conventional example, the manufacturing can be simplified and the cost can be reduced. The core with yoke 7 is composed of a plurality of core pieces with yoke portions 7A arranged in the circumferential direction, and the core pieces with yoke portions 7A are laminated with a plurality of flat steel plates 11a in the radial direction of the rotating shaft 5. A laminated steel plate 11. For this reason, for example, the axial gap type motor M can be easily manufactured only by arranging a plurality of core pieces 7A with yoke portions formed by cutting laminated steel plates in the circumferential direction and joining them. In this case, for example, it is possible to omit the trouble of managing a plurality of types of parts, such as the conventional example of laminating and forming steel plates that gradually widen in the radial direction in the core portion, and each of the plurality of types of parts can be obtained as desired. There is no need to ensure dimensional accuracy. Therefore, the manufacturing cost can be significantly reduced as compared with the conventional example.

  Since each core piece 7A with a yoke portion is a laminated body of steel plates 11a having the same shape, the core pieces 7A with yoke portions can be easily manufactured by stacking steel plates having the same shape. Therefore, it is possible to reduce the manufacturing cost by reducing the types of parts compared to the conventional example.

  Among the above-described manufacturing methods, in particular, in the cutting process, two magnetic pole core halves 9a and 9a having cut surfaces 14 alternately inclined with respect to the longitudinal direction of the laminated steel sheet W, and these magnetic core halves 9a and 9a By forming a plurality of core portions 7A with yoke portions having back yoke portions 7Ab that integrally connect the two, the core portions 7 with yokes are formed by joining in an annular shape so that the magnetic pole core halves are adjacent to each other in the circumferential direction. can do. As a result, the yoked core 7 can be formed without wasting the steel plate Wa that is a material and without adding other components. Therefore, the yield can be improved and the manufacturing cost can be reduced.

  In the cutting process, a plurality of parallel cut surfaces 14 are simultaneously cut out of the cut surfaces 14 that alternately incline the laminated steel sheet W with respect to the longitudinal direction. Thus, by cutting a plurality of parallel cut surfaces 14 simultaneously (in one step), cycle time can be reduced.

<Application example of axial gap type motor>
FIG. 11 shows a simplified example of a case where the device 6 using the axial gap motor M according to the embodiment is an electric linear actuator. A linear motion mechanism 101 is installed coaxially with the axial gap type motor M shown in FIG. The linear motion mechanism 101 includes a ball screw mechanism that is rotationally driven by the rotation shaft 5 of the axial gap type motor M, and converts the rotation of the axial gap type motor M into a linear motion of the linear motion unit 102. The motor-using device 6 that is the electric linear motion actuator is used, for example, in an electric brake device for braking a wheel of an automobile, and the linear motion portion 102 is used to drive the friction pad 104 forward and backward to be brought into contact with and separated from the brake rotor 103. Used.

  According to this electric linear actuator, since the axial gap type motor M is provided, it is possible to realize an electric brake device that enables high torque in a small space. For this reason, the versatility which mounts an electric brake device in a vehicle can be improved. In addition, the axial gap motor M can be easily manufactured simply by arranging and joining a plurality of core pieces 7A (FIG. 7) with yoke portions formed by cutting the laminated steel sheet W (FIG. 4) in the circumferential direction. The manufacturing cost of the electric brake device can be reduced.

  As mentioned above, although the form for implementing this invention based on embodiment was demonstrated, embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

2 ... Stator 3 ... Rotor 5 ... Rotating shaft 7 ... Core 7A with yoke 7 ... Core piece 7Ab with yoke portion ... Back yoke portion 8 ... Back yoke 9 ... Magnetic pole core 9a ... Magnetic pole core half 10 ... Coil 13 ... Projection piece

Claims (5)

A stator and a rotor rotatable with respect to the stator are of an axial gap type facing the axial direction of the rotor, and the stator is concentric with the rotating shaft of the rotor and has an annular back yoke, and the back yoke In an axial gap type motor including a core with a yoke having a plurality of magnetic pole cores protruding in the axial direction from a plurality of positions in the circumferential direction of a side surface, and a coil wound around each of the magnetic pole cores,
The core with yoke includes two magnetic pole core halves that are divided in the middle of the width in the rotor circumferential direction of each magnetic pole core in two adjacent magnetic pole cores, and a back yoke portion that integrally connects the magnetic pole core halves. A plurality of core pieces with yoke portions are arranged in the circumferential direction, and the core pieces with yoke portions are axially made of a laminated steel plate in which a plurality of flat steel plates are laminated in the radial direction of the rotating shaft. Gap type motor.   The axial gap type motor according to claim 1, wherein each of the core pieces with yoke portions is a laminated body of steel plates having the same shape. A stator and a rotor rotatable with respect to the stator are of an axial gap type facing the axial direction of the rotor, and the stator is concentric with the rotating shaft of the rotor and has an annular back yoke, and the back yoke In a manufacturing method of manufacturing an axial gap type motor including a core with a yoke having a plurality of magnetic pole cores protruding in the axial direction from a plurality of positions in a circumferential direction of a side surface, and a coil wound around each of the magnetic pole cores,
Steel plate preparation process of preparing a plurality of strip-shaped steel plates having a plurality of protruding pieces protruding in a comb-teeth shape,
A laminating process in which a plurality of the strip-shaped steel plates are laminated so that the protruding pieces overlap to form an elongated laminated steel plate;
Cutting the laminated steel sheet in the steel sheet thickness direction as a cutting surface inclined with respect to the protruding direction of the protruding piece at the location of each protruding piece, and cutting surfaces alternately inclined with respect to the longitudinal direction of the laminated steel sheet A cutting process of forming a plurality of core pieces with a yoke part having two magnetic pole core halves and a back yoke part integrally connecting the magnetic pole core halves;
A method of manufacturing an axial gap motor having a plurality of yoke pieces with a yoke portion and a joining process of forming the yoke-attached core by joining the magnetic pole core halves in an annular shape so as to be adjacent to each other in the circumferential direction. .   4. The axial gap motor manufacturing method according to claim 3, wherein, in the cutting process, an axial gap that simultaneously cuts a plurality of parallel cut surfaces among cut surfaces alternately inclined with respect to a longitudinal direction of the laminated steel plate. Type motor manufacturing method. 5. The axial gap motor manufacturing method according to claim 3, wherein in the cutting process, the laminated steel sheet is cut by wire cutting or laser to form a plurality of core pieces with yoke portions. 6. Manufacturing method.

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