JP6609138B2 - Axial gap type rotating electrical machine - Google Patents

Description

  The present invention relates to a rotary electric machine such as a motor and a generator, and more particularly to an axial gap type rotary electric machine in which a stator including an exciting coil and a rotor including a permanent magnet are arranged with an interval in the axial direction. .

  An axial gap type rotating electrical machine has advantages in that it can be made thinner and a large torque can be easily obtained, compared to a radial gap type in which a stator is provided on the outer peripheral side of the rotor. The rotating electrical machine has a structure in which a stator including a core member and an exciting coil and a rotor including a permanent magnet are arranged with a small interval (axial gap) in the axial direction. As the core member of the stator, a core member in which a plurality of pole members serving as the cores of the exciting coils are mounted on a cylindrical base portion formed by winding a magnetic steel strip is used. is there.

  Since the core member is composed of two members, a base part and a pole member, it is necessary to fix them together. In general, the pole member is fixed to the base portion using an adhesive, resin, or the like. At the time of fixing, it is necessary to accurately position the pole member with respect to the base portion so that a designed magnetic circuit can be formed. Patent Document 1 discloses a technique for positioning and fixing a pole member using a casing that houses a stator and a rotor.

JP 2014-117029 A

  However, when the pole member is positioned and fixed using the casing, it is necessary to perform appropriate processing on the casing. This complicates the structure of the casing, increases the number of assembly steps, and increases the cost.

  The present invention has been made in view of the above problems, and provides an axial gap type rotating electrical machine capable of accurately positioning a pole member of a stator with respect to a base portion without complicating the structure. The purpose is to do.

An axial gap type rotating electrical machine according to an aspect of the present invention includes a stator including a core member and a plurality of exciting coils, and a plurality of permanent magnets arranged in a circumferential direction around a rotation center axis. The core member is a cylindrical base portion formed of a winding body of a strip-shaped magnetic member, and a plurality of coils on which the exciting coil is wound. The pole member is placed on the end surface of the base portion in the axial direction and arranged in the circumferential direction according to the arrangement of the permanent magnets, and the stator is of the cylindrical type It further includes an annular bulk core disposed on the inner peripheral surface of the base portion, and the end surface on the radially inner side of the pole member is aligned with the boundary between the base portion and the bulk core. The pole member is fixed to the base portion. Cage, wherein the bulk core, at least the boundary portion includes a protrusion protruding in the axial direction than the end surface of the base portion, the end face of the radially inner side of the pole member is in contact with the said projecting portion .

According to this rotating electrical machine, an annular bulk core material is arranged on the inner peripheral surface of a cylindrical base portion. For this reason, a clear boundary part exists between the base part and the bulk core material. Using this boundary portion, the end surface on the radially inner side of the pole member can be aligned. Therefore, the pole member can be accurately aligned with the predetermined position of the base portion. Further, the pole member can be positioned by bringing the end surface on the radially inner side of the pole member into contact with the protruding portion. For this reason, the pole member can be positioned easily and reliably. Furthermore, since the protrusion and the end surface are in contact with each other, the pole member can be prevented from being displaced after the stator is assembled. For example, in a stator in which a resin mold is applied after assembly and the parts are fixed, even when the resin mold layer is thermally expanded and contracted, displacement of the pole member can be prevented.

In the above rotating electric machine, the bulk core material is preferably a core member around which the belt-shaped magnetic member is wound .

  According to this rotating electrical machine, since the winding core used when manufacturing the base portion made of the winding body of the belt-shaped magnetic member is used as the bulk core as it is, the winding core is wound after the winding operation. The work of pulling out the core and the work of newly attaching a member to be a bulk core material to the wound body can be omitted.

An axial gap type rotating electrical machine according to another aspect of the present invention includes a stator including a core member and a plurality of exciting coils, and a plurality of permanent magnets arranged in a circumferential direction around a rotation center axis, and the stator The core member is a cylindrical base portion formed of a winding body of a strip-like magnetic member, and the excitation coil is wound around the core member. A plurality of pole members, and the pole members are placed on an end surface of the base portion in the axial direction and arranged in a circumferential direction according to the arrangement of the permanent magnets, and the stator is the cylindrical type A ring-shaped bulk core material disposed on the inner peripheral surface of the base portion of the base member, wherein a radially inner end surface of the pole member is aligned with a boundary portion between the base portion and the bulk core material The pole member is fixed to the base portion. And has the strip-shaped magnetic member is a member having a first width in the axial direction, the base portion has a first width in the axial direction, said bulk core material wherein the axially first A step portion based on a difference between the first width and the second width is formed in the boundary portion, and a radially inner end face of the pole member is formed on the boundary portion. , that have contact with the step portion.

  Also with such a configuration, the pole member can be positioned using the stepped portion, and the pole member can be prevented from being displaced.

  In the above rotating electric machine, the bulk core member includes an engaging portion that engages with a part of the pole member and restricts movement of the pole member in the circumferential direction on a surface that forms the boundary portion. Is desirable.

  According to this rotating electrical machine, not only can the pole member be positioned in the radial direction using the boundary portion, but also the circumferential direction positioning can be performed using the engaging portion. Therefore, the positioning accuracy of the pole member can be further increased.

  In this case, it is desirable that the engaging portion is a concave portion having a width substantially equal to the circumferential width of the radially inner end face of each of the pole members.

  According to this rotating electrical machine, the positioning of the pole member in the radial direction and the circumferential direction can be achieved only by fitting the end surface portion on the radially inner side of the pole member into the recess.

  In the above rotating electric machine, the stator further includes a casing that accommodates the stator and the rotor, and a coupling member that mechanically couples the casing and the bulk core material, and the casing using the coupling member; The stator is preferably fixed to the casing by coupling with the bulk core material.

  In general, it is difficult to perform a process for mechanically connecting the base part made of a winding body of a belt-shaped magnetic member with a casing, for example, a screw hole drilling process. However, if it is a bulk core material, the said process is comparatively easy. Therefore, according to the above rotating electric machine, the fixing structure between the stator and the casing can be realized by simple processing.

  According to the present invention, in an axial gap type rotating electric machine that uses a base portion and a pole member as core members of a stator, the pole member can be accurately positioned with respect to the base portion without complicating the structure.

It is a figure showing roughly the structure of the axial gap type rotating electrical machine concerning the embodiment of the present invention. It is a side view of the stator and rotor of the rotary electric machine which concern on 1st Embodiment. It is a disassembled perspective view of the said stator and a rotor. It is a perspective view of the assembly state of the said stator and a rotor. FIG. 3 is a perspective view of the stator in a state where an exciting coil is removed. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. It is sectional drawing which shows the comparison structure with this embodiment. It is a perspective view which shows the stator which concerns on 2nd Embodiment. It is the IX-IX sectional view taken on the line of FIG. It is a top view of the bulk core material concerning a 3rd embodiment. It is a perspective view which shows the stator which concerns on 3rd Embodiment. It is a schematic diagram which shows the engagement state to the bulk core material of a pole member. It is a perspective view which shows the stator which concerns on 4th Embodiment. It is sectional drawing which shows the fixed state to the casing of the stator which concerns on 4th Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram schematically showing the structure of an axial gap type rotating electrical machine 1 according to an embodiment of the present invention. In the present invention, the axial gap type rotating electrical machine 1 can take the form of, for example, a motor or a generator, or a combination of these. In this embodiment, an axial gap type DC brushless motor is illustrated as a preferred example of the axial gap type rotating electrical machine.

[Overall structure of axial gap type rotating electrical machine]
The axial gap type rotating electrical machine 1 includes a casing 10 and a rotating shaft 11 partially protruding from the casing 10. The rotating shaft 11 serves as an output rotating shaft that generates torque when the rotating electrical machine 1 is used as a motor, and serves as an input rotating shaft to which a rotational driving force is input when used as a generator.

  The rotating electrical machine 1 includes a disk-shaped stator 2 housed in a casing 10 and two disk-shaped rotors 3. The stator 2 and the rotor 3 are arranged so as to be aligned in the axial direction of the rotating shaft 11. In the present embodiment, one rotor 3 is opposed to one disk surface of the stator 2, and the other rotor 3 is opposed to the other disk surface of the stator 2. A double rotor and double gap type rotating electrical machine 1 in which a stator 2 is sandwiched therebetween is illustrated. Of course, one stator faces one disk surface of the rotor, and the other stator faces the other disk surface of the rotor, whereby the rotor is sandwiched between the two stators. A single rotor or double gap type rotating electrical machine may be used. Further, the rotating electrical machine 1 may be a single rotor or single gap type in which one rotor 3 is disposed opposite to one stator 2 in the axial direction.

  Each rotor 3 is arranged with a gap G in the axial direction with respect to the stator 2. The interval G is a so-called axial gap, and its length is about 0.1 mm to several mm. The rotating shaft 11 is fixed to the disk-like rotor 3 so as to be aligned with the center of rotation. The two rotors 3 pass through the hollow portion of the stator 2 and are connected to each other by a connecting shaft (not shown) disposed on the same axis as the rotating shaft 11.

[First Embodiment]
FIG. 2 is a side view of the stator 2 and the rotor 3 of the rotating electrical machine 1 according to the first embodiment. FIG. 3 is a perspective view in which the stator 2 and the rotor 3 shown in FIG. 2 are disassembled so as to expand to the left and right, and FIG. 4 is a perspective view of the assembled state of the stator 2 and the rotor 3. FIG. 3 shows the rotation center axis AX of the rotor 3 (the axis of the rotation axis 11). 2 to 4, one rotor of the two rotors 3 shown in FIG. 1 and the stator 2 on the opposite side are depicted, and the other rotor 3 and this rotor 3 are depicted. The stator 2 facing is omitted.

  The stator 2 includes a cylindrical base portion 21 and a plurality of electromagnet units 20 arranged in the circumferential direction of the base portion 21 (the rotation direction of the rotor 3). Each electromagnet unit 20 includes a fan-shaped pole member 22 and an excitation coil 23 wound around the pole member 22. The core members in the present embodiment are the base portion 21 and the pole member 22. An annular bulk core 4 (FIG. 4) is disposed on the inner peripheral surface of the base portion 21. The plurality of pole members 22 are placed on one end face of the base portion 21 in the axial direction, and are uniformly arranged in an annular shape around the rotation center axis AX.

  The base portion 21 is a so-called wound iron core, and is composed of a wound body of a band-shaped magnetic member. As the strip-like magnetic member, for example, a magnetic steel strip is suitable. The base portion 21 is formed by winding a strip-shaped magnetic member many times around the outer peripheral surface of the bulk core material 4 in a spiral shape. That is, the bulk core material 4 is a member that becomes a core of a band-shaped magnetic member when the wound body is manufactured. The bulk core material 4 can be formed of a magnetic material such as iron or nickel, or a nonmagnetic material such as aluminum or brass. The base portion 21 and the bulk core material 4 are firmly joined by the winding tension of the belt-like magnetic member. In the present embodiment, the axial thicknesses of the base portion 21 and the bulk core material 4 are substantially the same.

  Since the base portion 21 is a wound body of a strip-shaped magnetic member, a plurality of steel strip layers are stacked in the radial direction. Therefore, the magnetic flux generated by the electromagnet unit 20 hardly flows in the radial direction of the base portion 21 and flows exclusively in the circumferential direction. For this reason, even if the bulk core material 4 made of a magnetic material is used, it is difficult for the magnetic flux to flow into the bulk core material 4 located on the inner peripheral surface (in the radial direction) of the base portion 21. Therefore, the magnetic circuit is not disturbed by the arrangement of the bulk core material 4, and the rotation torque is not reduced. However, when the thickness in the axial direction of the bulk core material 4 is made thicker than the base portion 21 as in the second embodiment to be described later, the flow of magnetic flux into the bulk core material 4 is assumed. Is preferably made of a non-magnetic material.

  The pole member 22 is a member that becomes a magnetic core in the electromagnet unit 20, and is a member that becomes a winding core of the exciting coil 23. One end surface in the axial direction of the pole member 22 is a joint surface with the base portion 21, and a flange portion 221 for forming a bobbin shape is provided on the other end surface in the axial direction. The one end face of the pole member 22 is fixed to the base portion 21 using, for example, an epoxy resin adhesive. The pole member 22 can be fixed to the base portion 21 by using a fixing tool such as a screw. However, since the base portion 21 is formed of a wound body of a band-shaped member, it is difficult to perform drilling or the like, and thus fixing using an adhesive is preferable.

  The pole member 22 is preferably a dust core. The dust core is a core formed by firmly pressing and solidifying iron powder covered with an electrical insulating film. From the viewpoint of suppressing eddy currents, a laminated core made of a laminate of a plurality of electromagnetic steel sheets can be used in addition to the dust core. The dust core is more preferable as the pole member 22 because it is more airtight and has a higher degree of freedom in molding than the laminated core.

  The exciting coil 23 is formed by winding an insulated wire a required number of turns around a bobbin-shaped pole member 22 as a core. By energizing the exciting coil 23 with a direct current, a magnetic flux penetrating the pole member 22 in a direction parallel to the rotating shaft 11 is generated. Further, the direction of the magnetic flux can be reversed by reversing the direction of direct current application to the exciting coil 23 in the forward and reverse directions. Energization of each excitation coil 23 and switching of the energization direction are controlled by a driver circuit (not shown), thereby forming magnetic lines of force that rotate the rotor 3 around the rotation axis 11.

  The rotor 3 includes a plurality of permanent magnets 32 and a disk-shaped base material 31 that supports the permanent magnets 32. Each permanent magnet 32 is made of neodymium or the like and is a fan-shaped flat-plate magnet as viewed in the axial direction. The base material 31 has a circular support surface 31S orthogonal to the rotation center axis AX on the side facing the stator 2. The plurality of permanent magnets 32 are arranged on the outer peripheral edge of the support surface 31S so that the S pole and the N pole are alternately arranged in the circumferential direction around the center point O of the support surface 31S (a point intersecting the rotation center axis AX). It is arranged in a ring in the vicinity.

  The pole members 22 of the stator 2 are arranged in the circumferential direction of the base portion 21 according to the arrangement of the permanent magnets 32. As shown in FIG. 2, the stator 2 and the rotor 3 are assembled so that the permanent magnet 32 and the flange portion 221 of the pole member 22 face each other with a predetermined gap G (axial gap) in the axial direction.

  The disk-shaped base material 31 is a member formed of a magnetic material such as a steel material, and has both the above-described function of supporting the permanent magnet 32 and the function of the permanent magnet 32 as a back yoke. The permanent magnet 32 whose surface facing the stator 2 is magnetized in the south pole has the back surface in the north pole. The adjacent permanent magnet 32 has an N pole on the front surface and an S pole on the back surface. The base material 31 serves to support the back side of the permanent magnets 32 and to form a magnetic path between the S pole and the N pole on the back side. The permanent magnet 32 is fixed to the support surface 31S using an adhesive such as an epoxy resin adhesive. Of course, you may fix the permanent magnet 32 to the support surface 31S using mechanical fixing means, such as a screw | thread.

  As described above, in the stator 2 of the present embodiment, the core member is composed of two members, the base portion 21 and the pole member 22. According to this embodiment, since a core member can be created with a combination of two separate members having a simple shape, there is an advantage that manufacture of the core member is facilitated. In addition, the base portion 21 can be manufactured simply by winding a belt-shaped magnetic member on the bulk core material 4, and there is an advantage that the material yield is good and the manufacturing is easy. In addition, the size of the wound body can be easily changed by changing the diameter of the bulk core material 4, and the large-diameter base portion 21 can be easily created. Furthermore, since the pole member 22 is separated from the base portion 21, there is an advantage that the size is reduced and the manufacture is facilitated.

  On the other hand, since the core member is composed of two separate members, the pole member 22 needs to be positioned and fixed at a predetermined position of the base portion 21. As described above, since the base portion 21 is formed of a wound member of a belt-like member, it is not easy to form a screw hole or the like, and the pole member 22 is generally fixed to the base portion 21 using an adhesive. Yes. In actual fixing work, a procedure is performed in which an operator applies an adhesive to one end face of the pole member 22, positions it on the end face of the base portion 21, and places it.

  However, in the fixing operation, it is difficult to accurately position the pole member 22 with good workability, and a positional shift may occur with respect to the design position on the base portion 21. The pole member 22 is a member that includes a flange 221 that faces the permanent magnet 32 of the rotor 3. For this reason, the positioning accuracy of the pole member 22 is poor. For example, when the distance between the permanent magnet 32 and the flange portion 221 is increased, disadvantages such as a decrease in torque of the rotating electrical machine 1 occur. Therefore, in the present embodiment, a device is provided that can position the pole member 22 accurately and easily with respect to the base portion 21.

  FIG. 5 is a perspective view of the stator 2 with the exciting coil 23 removed. The pole member 22 has a fan-shaped or trapezoidal cross-sectional shape orthogonal to the axial direction, and has an outer end surface 222 and an inner end surface 223 that are opposed to each other in the radial direction of the base portion 21. In the present embodiment, the pole member 22 is fixed to the base portion 21 in a state where the inner end surface 223 of the pole member 22 is aligned with the boundary portion B between the base portion 21 and the bulk core material 4. That is, by deliberately placing the bulk core material 4 on the inner peripheral surface of the base portion 21, a boundary B serving as a clear mark is formed on the inner peripheral side of the base portion 21. The operator can position the pole member 22 on the base portion 21 by using the boundary B as at least a radial positioning line.

  6 is a cross-sectional view taken along line VI-VI in FIG. The base portion 21 has a cylindrical shape having an outer peripheral surface 211 corresponding to the winding end side of the belt-shaped magnetic member and an inner peripheral surface 212 corresponding to the winding start side. The annular bulk core 4 includes an outer peripheral surface 41 in contact with the inner peripheral surface 212 and an inner peripheral surface 42 facing the center of the diameter. A portion where the inner peripheral surface 212 of the base portion 21 and the outer peripheral surface 41 of the bulk core material 4 are joined is a boundary portion B. The outer end surface 222 of the pole member 22 is located radially inside the outer peripheral surface 211 of the base portion 21. On the other hand, the inner end surface 223 of the pole member 22 is aligned with the boundary portion B. In addition, it is desirable that the inner end surface 223 has a shape that matches the outer peripheral surface 41 of the bulk core material 4 in order to achieve more accurate positioning.

  In order to manufacture the base portion 21 made of a winding body of a belt-like magnetic member, a member that becomes a core is always required. In general, when the winding work of the belt-shaped magnetic member is finished, the winding core is removed, and the wound body is shaped (prevented from loosening) by impregnating the wound body with resin. . In the present embodiment, the winding core is the bulk core material 4. Then, after the winding operation, the bulk core material 4 is not removed and remains as a part of the stator 2. As a result, the operator can easily position the pole member 22 using the boundary portion B between the base portion 21 and the bulk core material 4 as a mark. In addition, since the shape of the wound body (the base portion 21) can be maintained by the winding tension of the belt-shaped magnetic member by placing the bulk core material 4, the shape is maintained as compared with the case where the shape is maintained depending only on the resin impregnation. It is advantageous.

  The bulk core material 4 may be a member other than that used as the core. However, in this embodiment, the core used when manufacturing the base part 21 which consists of a winding body of a strip | belt-shaped magnetic member is used as the bulk core material 4 as it is. For this reason, the work of extracting the core after the winding work of the wound body and the work of newly attaching the bulk core material 4 to the wound body can be omitted, and the workability is good.

  Further, the bulk core material 4 also functions as a collar portion of the exciting coil 23. FIG. 7 is a cross-sectional view showing a comparative structure for this embodiment. Although it is not as clear as the boundary portion B in terms of a mark for positioning the pole member 22, it cannot be positioned using the inner peripheral surface 212 of the base portion 21 as a mark. That is, even if the bulk core material 4 is not present, if the inner peripheral surface 212 of the base portion 21 and the inner end surface 223 of the pole member 22 are aligned, the alignment of the pole member 22 in the radial direction can be performed. FIG. 7 shows such an alignment state.

  However, in this case, the radially outer lower surface 231 of the exciting coil 23 faces the vicinity of the outer peripheral surface 211 of the base portion 21, but the radially inner lower surface 232 has no facing portion. That is, there is no member that supports the lower surface 232 on the radially inner side of the excitation coil 23, and the lower surface 232 is in a floating state. On the other hand, in this embodiment, as shown in FIG. 6, the bulk core material 4 exists adjacent to the inner peripheral surface 212 of the base portion 21. Since the bulk core 4 faces the lower surface 232 of the exciting coil 23, the lower surface 232 does not float. Therefore, the exciting coil 23 can be stably held on the pole member 22.

[Second Embodiment]
FIG. 8 is a perspective view showing the stator 2A according to the second embodiment, and FIG. 9 is a sectional view taken along line IX-IX in FIG. The difference between the stator 2A and the first embodiment is that the bulk core material 4A includes a protruding portion 43 that protrudes in the axial direction from the inner peripheral surface 212 of the base portion 21 at the boundary portion B. . The pole member 22 is positioned by the radially inner end surface 223 of the pole member 22 coming into contact with the protruding portion 43.

  In the first embodiment, the base portion 21 and the bulk core material 4 are members having the same thickness in the axial direction. However, in the second embodiment, the bulk core material 4A is more than the base portion 21. A member having an axial thickness thicker than the distance h is applied. In other words, a band member having a predetermined first width in the axial direction is used as the band-shaped magnetic member constituting the base portion 21, whereby the base portion 21 having the first width in the axial direction is manufactured. The This is the same as in the first embodiment. On the other hand, as the bulk core material 4A, one having a second width longer than the first width in the axial direction is used.

  When the strip-shaped magnetic member is wound around the bulk core material 4A, the strip-shaped magnetic member is wound so that one end in the width direction of the strip-shaped magnetic member is along the bottom surface 421 of the bulk core material 4A. Accordingly, the bottom surface 213 of the base portion 21 is flush with the bottom surface 421 of the bulk core material 4A. Then, a stepped portion 431 having a distance h based on the difference between the first width and the second width is formed in the boundary portion B. The pole member 22 is positioned by the radially inner end surface 223 of the pole member 22 coming into contact with the stepped portion 431.

  In the second embodiment, the bulk core material 4 </ b> A includes a protruding portion 43 protruding in the axial direction from the base portion 21. For this reason, the path | route into which magnetic flux flows into 4 A of bulk core materials through the protrusion part 43 may be produced | generated. Therefore, it is desirable to use a non-magnetic material as the material of the bulk core material 4A. When a magnetic material is used as the material of the bulk core material 4A, it is desirable to make the distance h as small as possible in order to suppress the flow of magnetic flux.

  According to the stator 2 </ b> A according to the second embodiment, an operator can position the pole member 22 by bringing the inner end surface 223 of the pole member 22 into contact with the protruding portion 43. For this reason, the positioning of the pole member 22 can be performed more easily and reliably. Furthermore, since the protrusion part 43 and the inner side end surface 223 are contact | abutting, the position shift of the pole member 22 after the assembly of 2 A of stators can be prevented. After the stator is assembled, a resin mold may be applied to the whole to fix the members to each other to complete the stator. When such a resin mold is applied to the stator 2A of the present embodiment, the protrusion 43 and the inner end surface 223 are in contact with each other even when the resin mold layer is thermally expanded and contracted. Misalignment can be prevented.

[Third Embodiment]
FIG. 10 is a plan view of a bulk core material 4B according to the third embodiment, and FIG. 11 is a perspective view showing a stator 2B according to the third embodiment. The difference between the stator 2B and the first and second embodiments is that the bulk core material 4B is engaged with a part of the pole member 22 and an engaging portion that restricts the movement of the pole member 22 in the circumferential direction. It is a point provided on the surface forming the boundary B.

  The bulk core material 4 </ b> B has an axial thickness that is thicker than the base portion 21, and the inner end surface 223 in the radial direction of the pole member 22 abuts on the protruding portion of the base portion 21. Positioning has been done. This is the same as in the second embodiment. In addition, the positioning of the pole member 22 in the circumferential direction is also performed by the engaging portion. In the present embodiment, the engaging portions are a plurality of concave portions 44 formed on the outer peripheral surface 41 of the bulk core material 4B.

  FIG. 12 is a schematic diagram illustrating a state in which the pole member 22 is engaged with the bulk core material 4B in the circumferential direction. The concave portion 44 is formed by partially denting the outer peripheral surface 41 radially inward, and a convex portion 45 exists between the adjacent concave portions 44. Each recess 44 has a width substantially equal to the circumferential width of the inner end surface 223 of the pole member 22. As shown in FIG. 12, a region near the inner end surface 223 of the pole member 22 is fitted in the recess 44. The vicinity region is restrained by the side wall of the convex portion 45, and the movement of the pole member 22 in the circumferential direction is restricted.

  According to the stator 2 </ b> B according to the third embodiment, the operator can not only perform the radial positioning of the pole member 22 using the boundary B, but also use the concave portion 44 and the convex portion 45 in the circumferential direction. Can also be positioned. That is, the positioning of the pole member 22 in the radial direction and the circumferential direction can be achieved only by fitting the vicinity of the inner end surface 223 in the radial direction of the pole member 22 into the recess 44. Therefore, the positioning accuracy of the pole member 22 can be further enhanced extremely easily.

[Fourth Embodiment]
FIG. 13 is a perspective view showing a stator 2C according to the fourth embodiment. The bulk core material 4C included in the stator 2C has a plurality of screw holes 46 penetrating in the axial direction. Since the bulk core material 4C is not a laminated body member such as a wound iron core but a bulk body, the process of drilling the screw holes 46 can be easily performed. Any of the bulk core materials 4, 4 </ b> A, and 4 </ b> B of the above-described first to third embodiments may be used as a bulk core material serving as a base for drilling the screw holes 46.

  FIG. 14 is a cross-sectional view showing a fixed state of the stator 2 </ b> C according to the fourth embodiment to the casing 10. Here, unlike FIG. 1, a single rotor type rotating electrical machine is shown. The casing 10 that houses the stator 2 </ b> C and the rotor 3 includes a pair of side walls 101, 102 and an outer peripheral wall 103. The rotor 3 rotates integrally with the rotating shaft 11 by fixing the base material 31 supporting the permanent magnet 32 to the rotating shaft 11. The rotating shaft 11 is rotatably supported by bearings 12 and 12 at the inner peripheral ends of the pair of side walls 101 and 102, respectively.

  The stator 2 </ b> C is attached to one side wall 101. A through hole 104 corresponding to the screw hole 46 of the bulk core material 4 </ b> C is formed in the side wall 101. The stator 2C is arranged such that the base portion 21 and the bulk core material 4C are along the side wall 101, and the screw holes 46 and the through holes 104 are aligned. A screw 13 (coupling member) is screwed into the screw hole 46 through the through hole 104. The side wall 101 and the bulk core material 4 </ b> C are mechanically coupled by the screwing, and the stator 2 </ b> C is fixed to the casing 10 by this coupling. Note that the bulk core material 4C and the base portion 21 are firmly joined by the winding tension of the belt-like magnetic member.

  In general, it is difficult to perform processing for mechanically connecting the base portion 21 formed of a wound body of a belt-shaped magnetic member with the casing 10, for example, drilling of screw holes. However, with the bulk core material 4C, the processing is relatively easy. Therefore, according to the above rotating electric machine, the fixing structure between the stator 2C and the casing 10 can be realized by simple processing. In addition, since the structure is mechanically fastened with the screws 13, it is possible to realize firm fixation as compared to the case where the stator is fixed to the casing 10 by resin molding.

  According to the axial gap type rotating electrical machine 1 according to the present invention described above, when the base portion 21 and the pole member 22 are used as the core members of the stator 2, the pole member 22 is mounted on the base portion without complicating the structure. 21 can be accurately positioned. Therefore, according to this invention, the axial gap type rotary electric machine 1 which can generate | occur | produce the torque as designed reliably can be provided.

1 Axial Gap Type Rotating Electric Machine 10 Casing 13 Screw (Coupling Member)
2, 2A, 2B, 2C Stator 21 Base portion 22 Pole member 23 Excitation coil 3 Rotor 32 Permanent magnet 4, 4A, 4B, 4C Bulk core material 43 Projection portion 431 Step portion 44 Recess portion (engagement portion)
AX Rotation center axis B Boundary part G Interval (Axial gap)

Claims (6)

A stator comprising a core member and a plurality of exciting coils;
A plurality of permanent magnets arranged in a circumferential direction around a rotation center axis, and a rotor arranged at an interval in the axial direction with respect to the stator, and
The core member includes a cylindrical base portion formed of a winding body of a band-shaped magnetic member, and a plurality of pole members around which the excitation coil is wound, and the pole member is formed of the base portion in the axial direction. Placed on the end face, arranged in the circumferential direction according to the arrangement of the permanent magnets,
The stator further includes an annular bulk core disposed on an inner peripheral surface of the cylindrical base portion,
The pole member is fixed to the base portion in a state in which the end surface on the radially inner side of the pole member is aligned with the boundary portion between the base portion and the bulk core material ,
The bulk core includes a protruding portion that protrudes in an axial direction from an end surface of the base portion at least in the boundary portion,
An axial gap type rotating electrical machine in which an end surface on the radially inner side of the pole member is in contact with the protruding portion . A stator comprising a core member and a plurality of exciting coils;
A plurality of permanent magnets arranged in a circumferential direction around a rotation center axis, and a rotor arranged at an interval in the axial direction with respect to the stator, and
The core member includes a cylindrical base portion formed of a winding body of a band-shaped magnetic member, and a plurality of pole members around which the excitation coil is wound, and the pole member is formed of the base portion in the axial direction. Placed on the end face, arranged in the circumferential direction according to the arrangement of the permanent magnets,
The stator further includes an annular bulk core disposed on an inner peripheral surface of the cylindrical base portion,
The pole member is fixed to the base portion in a state where an end surface on the radially inner side of the pole member is aligned with a boundary portion between the base portion and the bulk core material,
The strip-shaped magnetic member is a member having a first width in the axial direction, and the base portion has the first width in the axial direction,
The bulk core has a second width longer than the first width in the axial direction;
A step portion based on the difference between the first width and the second width is formed in the boundary portion,
An axial gap type rotating electrical machine in which an end surface on the radially inner side of the pole member is in contact with the stepped portion. In the axial gap type rotating electrical machine according to claim 1 or 2 ,
The said bulk core material is an axial gap type rotary electric machine which is a core member by which the said strip | belt-shaped magnetic member is wound . In the axial gap type rotating electrical machine according to any one of claims 1 to 3 ,
An axial gap type rotating electrical machine, wherein the bulk core member includes an engaging portion that engages with a part of the pole member and restricts movement of the pole member in a circumferential direction on a surface that forms the boundary portion. In the axial gap type rotating electrical machine according to claim 4 ,
The axial gap type rotating electrical machine, wherein the engaging portion is a concave portion having a width substantially equal to a circumferential width of the radially inner end face of each of the pole members. In the axial gap type rotating electrical machine according to any one of claims 1 to 5 ,
A casing for housing the stator and the rotor;
A coupling member that mechanically couples the casing and the bulk core, and
An axial gap type rotating electrical machine in which the stator is fixed to the casing by coupling the casing and the bulk core using the coupling member.

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