JP2010154610A - Axial gap motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axial gap motor wherein it is possible to cool a stator without increasing the axial width of the motor. <P>SOLUTION: The axial gap motor includes: a rotor 11 rotatable around a rotating shaft; a stator 12 disposed opposite to the rotor 11 at least from one side in the direction of the rotating shaft; and a housing 13 for holding the stator 12. The stator 12 is formed by winding a tape-like magnetic plate 50. Protrusions 23a are substantially evenly formed on the surface 21b of the yoke portion 21 of the stator 12 opposed to the housing in the circumferential direction. Recesses 14a fit on the protrusions 23a are formed on the circular plate portion 14 of the housing 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an axial gap type motor.

  Conventionally, for example, a rotor that can rotate around a rotation axis and a stator that is disposed to face the rotor from at least one side in the direction of the rotation axis are provided. An axial gap type motor that forms a loop is known (for example, see Patent Document 1).

As shown in FIG. 9, the axial gap type motor 100 described in Patent Document 1 is arranged so as to face a rotor 101 that can rotate around a rotation axis and the rotor 101 from one side in the direction of the rotation axis. The winding 105 is wound around a stator core 104 composed of a yoke portion 102 and a plurality of teeth 103 projecting from the rotor facing surface of the yoke portion 102 toward the rotor 101 and extending radially in the radial direction. A stator 106 and a housing 107 that holds the stator 106 are provided, and a storage space 108 that stores the coolant is provided in the housing 107 on the housing facing surface side (back side in the axial direction) of the stator 106. The stator 106 is cooled from the back side in the axial direction by cooling with a heat exchanger.
Further, Patent Document 1 discloses that the heat transfer efficiency is improved by providing fins 109 on the housing facing surface of the stator 106 and increasing the contact area between the stator 106 and the coolant as shown in FIG.

JP 2005-269845 A

This axial gap motor 100 has a problem that the axial width of the motor 100 is increased because the coolant storage space 108 is provided in the housing 107 located on the rear side in the axial direction of the stator 106.
In addition, when the stator core 104 is formed of a dust material, there is no risk of leakage of the coolant into the stator 106. However, since the dust material is expensive and cannot be enlarged, in recent years, the stator core is wound by winding a magnetic plate. It is known to compose. In this case, in the above cooling structure, a special structure is required to ensure the insulation between the winding 105 and the stator core 104 in order to prevent the coolant from leaking out from the laminated magnetic plates. Although it is disclosed that a lid member separate from the stator core 104 is separately provided, there is a problem in that the number of parts increases and the axial width of the motor 100 further increases.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an axial gap type motor capable of cooling the stator without increasing the axial width of the motor.

In order to achieve the above object, the invention described in claim 1
A rotor capable of rotating around a rotation axis (for example, a rotor 11 in an embodiment described later);
A substantially annular plate-shaped yoke portion (for example, a yoke portion 21 in an embodiment described later) and a rotor-facing surface of the yoke portion that protrudes toward the rotor from at least one side in the rotational axis direction. And a plurality of teeth extending radially in the radial direction (for example, teeth 22 in the embodiments described later), and windings (for example, embodiments described later) around a stator core (for example, stator core 25 in the embodiments described later). A stator (for example, a stator 12 in an embodiment described later),
An axial gap type motor (for example, an axial gap type motor 10 in an embodiment described later) including a housing (for example, a housing 13 in an embodiment described later) that holds the stator,
The stator is configured by winding a tape-shaped magnetic plate (for example, a magnetic plate 50 in the embodiment described later), and is substantially uniform in the circumferential direction on the housing facing surface of the yoke portion opposite to the rotor facing surface. It has a protruding portion (for example, protruding portions 23a and 23b in the embodiments described later),
The housing has recesses (for example, recesses 14a and 14b in embodiments described later) that fit into the protrusions.
It is characterized by that.

In addition to the configuration of the invention described in claim 1, the invention described in claim 2
A plurality of the protrusions are formed concentrically.
It is characterized by that.

In addition to the configuration of the invention described in claim 1, the invention described in claim 3 includes
A plurality of the protrusions are formed radially,
It is characterized by that.

In addition to the configuration of the invention described in claim 3, the invention described in claim 4
Each of the protrusions is disposed in a region where a slot formed between the teeth adjacent in the circumferential direction of the rotor facing surface of the yoke portion is projected onto the housing facing surface.
It is characterized by that.

In addition to the structure of the invention in any one of Claims 1-4, the invention of Claim 5 is
The protruding portion has a thermal stress relaxation portion (for example, chamfered portions 57 and 57 in an embodiment described later) that relaxes thermal stress at a contact portion with the concave portion of the housing.
It is characterized by that.

In addition to the structure of the invention in any one of Claims 1-5, the invention of Claim 6 is
A heat transfer material layer (for example, a heat transfer material layer 70 in an embodiment described later) is interposed between the stator core and the housing.
It is characterized by that.

In addition to the structure of the invention described in claim 6, the invention described in claim 7 includes
The heat transfer material layer is made of a resin material containing a material having a high heat transfer coefficient.
It is characterized by that.

In addition to the structure of the invention in any one of Claims 1-5, the invention of Claim 8 is
The housing is formed by casting into the stator core in which the protrusion is formed.
It is characterized by that.

In addition to the structure of the invention in any one of Claims 1-8, the invention of Claim 9 is
The stator core has a tooth piece (for example, a tooth piece 51 in the embodiment described later) on one side in the width direction and a protruding piece (for example, described later) that forms the protrusion on the other side in the width direction. It is configured by winding the magnetic plate having the protruding portion pieces 53, 55) in the embodiment.
It is characterized by

  According to the first aspect of the present invention, since the protrusion is provided on the housing-facing surface of the yoke portion of the stator and the recess is provided in the housing so as to be fitted with the protrusion, the stator can be improved while increasing the contact area and improving the heat dissipation. Can be cooled. Further, it is not necessary to provide a storage space for storing the coolant in the housing, and the axial width of the motor is not increased. In addition, since the stator is cooled without using a coolant, it is not necessary to provide a special structure to ensure the insulation between the winding and the stator core even when the rotor core is formed by winding a magnetic plate. . Furthermore, the stator and the housing can be firmly fixed.

  According to the invention of claim 2, since the projecting portions are formed in a plurality of concentric shapes, there is no thermal imbalance depending on the position in the circumferential direction, and a reduction in cooling efficiency due to the thermal imbalance can be prevented.

  According to the invention of claim 3, since a plurality of protrusions are formed radially, there is no thermal imbalance depending on the position in the circumferential direction, and a reduction in cooling efficiency due to the thermal imbalance can be prevented.

  According to the fourth aspect of the present invention, since the protruding portion is provided on the back surface portion of the slot while avoiding the back surface portion of the teeth, it is possible to prevent magnetic flux from leaking from the teeth to the housing through the protruding portion.

  According to the invention of claim 5, stress concentration at the time of temperature change due to the difference in coefficient of thermal expansion between the stator and the housing can be relaxed.

  According to the invention of claim 6, by interposing the heat transfer material layer between the stator core and the housing, it is possible to ensure adhesion at the contact surface, eliminate the air layer, and improve heat dissipation. . For example, silicon grease is interposed.

  According to the invention of claim 7, since the heat transfer material layer is made of the resin material containing the material having a high heat transfer coefficient, the heat transfer coefficient can be improved. For example, heat transfer can be promoted and heat dissipation can be improved by adding iron or the like to silicon grease.

  According to the eighth aspect of the present invention, the housing is integrally formed by casting into the stator core in which the protruding portion is formed, so that the adhesion at the contact surface between the stator and the housing can be improved. Moreover, the shape flexibility of the stator core can be improved and the strength can be improved.

  According to the ninth aspect of the present invention, the stator core is formed by winding the magnetic plate having the teeth pieces constituting the teeth on one side in the width direction and having the protruding piece pieces constituting the protruding portions on the other side in the width direction. The stator core can be easily manufactured by winding the magnetic plate and then winding it. In addition, the manufacturing cost can be reduced.

  Hereinafter, embodiments of an axial gap type motor according to the present invention will be described in detail with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

<First Embodiment>
As shown in FIG. 1, for example, the axial gap type motor 10 according to the present embodiment includes a substantially annular rotor 11 that is rotatably provided around the rotation axis O of the axial gap type motor 10, and a rotation axis O direction. A pair of stators 12, 12 that are arranged to face each other with both sides of the rotor 11 and have a plurality of windings 26 that generate a rotating magnetic field that rotates the rotor 11, and a housing 13 that holds the stators 12, 12. It is prepared for.

  The axial gap type motor 10 is mounted as a drive source in a vehicle such as a hybrid vehicle or an electric vehicle, for example, and an output shaft is connected to an input shaft of a transmission (not shown), whereby the driving force of the axial gap type motor 10 is obtained. Is transmitted to drive wheels (not shown) of the vehicle via a transmission.

  Further, when the driving force is transmitted from the driving wheel side to the axial gap type motor 10 during deceleration of the vehicle, the axial gap type motor 10 functions as a generator to generate a so-called regenerative braking force, and the kinetic energy of the vehicle body is electrically converted. Recover as energy (regenerative energy). Further, for example, in a hybrid vehicle, when the rotating shaft of the axial gap type motor 10 is connected to the crankshaft of an internal combustion engine (not shown), the axial gap motor 10 is also axially transmitted when the output of the internal combustion engine is transmitted to the axial gap type motor 10. The gap type motor 10 functions as a generator and generates power generation energy.

  Each stator 12 includes a stator core 25 formed by winding a tape-like magnetic plate (for example, a silicon steel plate) and a winding 26 wound around the stator core 25. The stator core 25 is a substantially annular plate. Yoke portion 21, a plurality of substantially fan-shaped teeth 22, ..., 22 formed at equal intervals in the circumferential direction on the rotor facing surface 21a of the yoke portion 21, and the rotor facing surface 21a of the yoke portion 21 are opposite to each other And a plurality of (here, three) annular protrusions 23a, 23a, 23a formed on the side housing facing surface 21b. The teeth 22,... 22 project from the rotor facing surface 21 a toward the rotor 11 and extend radially in the radial direction, and the projecting portions 23 a, 23 a, 23 a are concentrically about the rotation axis O in the radial direction, etc. It is formed at intervals.

  Each stator 12 is, for example, a 6N type having six main poles (for example, U +, V +, W +, U−, V−, W−), and each U +, V +, W + pole of one stator 12. On the other hand, the U-, V-, and W-poles of the other stator 12 are set to face each other in the direction of the rotation axis O. For example, with respect to a pair of stators 12 and 12 opposed in the direction of the rotation axis O, three teeth 22 of one stator 12 corresponding to one of U +, V +, W + poles and one of U−, V−, W− poles, 22, 22 and the three teeth 22, 22, 22 of the other stator 12 corresponding to the other of the U +, V +, W + pole and the U−, V−, W− pole face each other in the direction of the rotation axis O. Thus, the energized state of the teeth 22 of one stator 12 and the teeth 22 of the other stator 12 facing each other in the direction of the rotation axis O is set so as to be reversed by an electrical angle.

  The housing 13 is made of, for example, aluminum, and is provided on both sides of the rotation axis O direction, and a pair of disk portions 14 and 14 that respectively hold the stator 12, and a cylindrical portion 15 that covers the rotor 11 and the stators 12 and 12 from the outside in the radial direction. And is configured. Each of the disk portions 14 and 14 has an annular recess 14a, 14a, 14a that engages with a plurality of annular protrusions 23a, 23a, 23a formed on the housing facing surface 21b of the stator 12, respectively. A plurality (three in this case) are provided at equal intervals concentrically with respect to the center.

  As shown in FIG. 3, the rotor 11 includes a plurality of main magnet portions 31,..., A plurality of sub magnet portions 32,..., 32, and a rotor frame 33 made of a nonmagnetic material. The main magnet part 31 and the sub magnet part 32 are accommodated in the rotor frame 33 in a state of being alternately arranged in the circumferential direction.

  The rotor frame 33 includes an inner annular ring shaft portion 36 and an outer circumferential annular ring rim portion 37 connected by a plurality of radial ribs 35,... 35 arranged at predetermined intervals in the circumferential direction. An output shaft connected to an external drive shaft (for example, an input shaft of a vehicle transmission) can be connected to the inner peripheral portion of the shaft portion 36. The radial rib 35 is formed in a columnar shape with a uniform width in the rotation axis O direction and the circumferential direction.

  The main magnet portion 31 has a substantially sector plate-shaped main permanent magnet piece 41 magnetized in the thickness direction (that is, the rotation axis O direction), and a pair of sandwiching the main permanent magnet piece 41 from both sides in the thickness direction. The main permanent magnet pieces 41 and 41 of the main magnet portions 31 and 31 that are configured to include substantially fan-shaped magnetic members 42 and 42 and are adjacent to each other in the circumferential direction are set so that the magnetization directions thereof are different from each other. Has been.

  The plurality of main magnet portions 31,..., 31 accommodated in the rotor frame 33 are sandwiched between the shaft portion 36 and the rim portion 37 from both sides in the radial direction, and in the circumferential direction via the radial ribs 35. They are arranged next to each other.

  In the rotor frame 33, the main permanent magnet piece 41 of each main magnet portion 31 is sandwiched by two radial ribs 35 from both sides in the circumferential direction, and the thickness of the main permanent magnet piece 41 in the rotation axis O direction is the radial direction. It is equivalent to the thickness of the rib 35 in the direction of the rotation axis O.

  The magnetic member 42 is a substantially fan-shaped plate, and is manufactured by laminating a plurality of electromagnetic steel plates or by molding and sintering powders such as iron powder.

  The sub-magnet portion 32 includes a pair of sub-permanent magnet pieces 43 and 43 sandwiching the radial rib 35 from both sides in the rotation axis O direction in the rotor frame 33, and a pair of sub-magnets facing each other in the rotation axis O direction. The permanent magnet pieces 43 and 43 are respectively magnetized in a direction (substantially circumferential direction) orthogonal to the rotation axis O direction and the radial direction, and the magnetization directions are different from each other.

  The thickness of the secondary permanent magnet piece 43 in the direction of the rotational axis O is equivalent to the thickness of the magnetic member 42 in the direction of the rotational axis O, and the circumferential width of the secondary permanent magnet piece 43 is the circumferential direction of the radial rib 35. It is equivalent to the width.

  In the rotor frame 33, the sub permanent magnet pieces 43, 43 of the sub magnet portions 32, 32 adjacent in the circumferential direction sandwich the magnetic member 42 of the main magnet portion 31 from both sides in the circumferential direction.

  In FIG. 3, in which the rotor frame 33 of the rotor 11 and the components other than the rotor frame 33 (that is, the main magnet portion 31 and the sub magnet portion 32) are shown separately, a pair facing each other in the direction of the rotation axis O. A space 43a in which the radial ribs 35 of the rotor frame 33 are disposed is formed between the sub permanent magnet pieces 43, 43 and between the main permanent magnet pieces 41, 41 adjacent in the circumferential direction.

  Further, the pair of sub permanent magnet pieces 43, 43 facing each other in the circumferential direction via the magnetic member 42 have different magnetization directions. The pair of sub permanent magnet pieces 43 and 43 arranged on one side in the direction of the rotation axis O have the same polarity as the magnetic pole on one side of the main permanent magnet piece 41 magnetized in the direction of the rotation axis O. A pair of sub-permanent magnet pieces 43, 43 that are opposed to each other and arranged on the other side in the direction of the rotation axis O are magnetic poles having the same polarity as the magnetic pole on the other side of the main permanent magnet piece 41 magnetized in the direction of the rotation axis O. Are arranged to face each other.

  That is, for example, with respect to the main permanent magnet piece 41 in which one side in the rotation axis O direction is an N pole and the other side is an S pole, a pair of magnetic members 42 are sandwiched from both sides in the circumferential direction on one side in the rotation axis O direction. The sub permanent magnet pieces 43, 43 are arranged so that their N poles face each other in the circumferential direction, and a pair of sub permanent magnet pieces 43 sandwiching the magnetic member 42 from both sides in the circumferential direction on the other side in the rotation axis O direction. , 43 are arranged so that their S poles face each other in the circumferential direction. Accordingly, the magnetic fluxes of the main permanent magnet piece 41 and the sub permanent magnet pieces 43 and 43 are converged by the magnetic lens effect due to the so-called permanent magnet Halbach arrangement, and the effective magnetic flux linked to the stators 12 and 12 is relatively relative to each other. It is going to increase.

  Next, a method for manufacturing the stator core 25 of the axial gap motor 10 of the present invention will be specifically described with reference to FIGS. The width direction of the magnetic plate 50 is the rotation axis O direction of the stator 12, and the longitudinal direction of the magnetic plate 50 is the circumferential direction of the stator 12.

  First, the magnetic plate 50 having a width equivalent to the axial length from the tip of the tooth 22 formed on the rotor facing surface 21a of the yoke portion 21 to the tip of the protruding portion 23a formed on the housing facing surface 21b is not shown. Using the press molding machine, a notch 52 for slot is formed by punching so as to leave the tooth piece 51 constituting the tooth 22 on one side in the width direction, and the protruding piece 53 constituting the protruding portion 23a on the other side in the width direction. The protruding portion cutout portion 54 is punched and formed so as to leave a mark. At this time, the notches 54 are punched at predetermined intervals so that a plurality of protrusions 53 are formed in the radial direction. Since the magnetic plate 50 is wound in a spiral shape on the core 60 as will be described later, if the distance between the centers of the adjacent slot notches 52 and 52 shown in FIG. Is the first, second, third, ... from the innermost diameter side and gradually becomes longer as it goes to the outermost diameter side, and the teeth 22 have a generally fan-shaped shape that expands as it goes radially outward. Therefore, the length T in the longitudinal direction of the teeth 22 is also gradually increased from the innermost diameter side to the first, second, third,... Accordingly, the magnetic plate 50 is punched in consideration of these relationships.

  Subsequently, the magnetic plate 50 in which the slot cutout portion 52 and the protrusion cutout portion 54 are formed is fixed and wound on the spiral core 60 shown in FIG. Then, the winding start and the winding end of the magnetic plate 50 wound to a predetermined size finish the winding at substantially the same position in the radial direction from the center of the core 60, and the winding of the wound magnetic plate 50 begins. A stator core is formed by welding the end of the winding. The magnetic plate 50 may be bonded with an adhesive while winding or after winding. The stator core 25 formed by winding in this manner has a plurality of teeth pieces 51,..., 51 arranged in the radial direction in the same phase from the center on one side in the width direction of the yoke portion 21, so that the teeth 22 are laminated. The plurality of protruding portion pieces 53,..., 53 are stacked on the other side in the width direction to form the protruding portion 23a.

  Next, the housing facing surface 21b of the stator core 25 is disposed so as to face the mold, and includes a recess 14a that fits into the protruding portion 23a formed on the housing facing surface 21b by, for example, melting and casting aluminum. The disc portion 14 is formed integrally with the stator core 25. Alternatively, as another method, the concave portion 14a fitted to the protruding portion 23a formed on the housing facing surface 21b of the stator core 25 is cut into a disk-shaped member, and the protruding portion 23a and the concave portion 14a are fitted and bonded. It may be fixed by an agent or welding.

  Then, the windings 26 are attached to the teeth 22,..., 22 of the stator core 25, and the stators 12 and 12 integral with the disk portions 14 and 14 are disposed on both sides of the rotor 11 connected to the shaft member from the rotation axis O direction. The cylindrical portion 15 is disposed so as to cover the rotor 11 and the stators 12 and 12 from the outside in the radial direction, and the cylindrical portion 15 and the pair of disk portions 14 and 14 are fixed by, for example, welding, to thereby form the axial gap motor 10. Is manufactured.

  As described above, according to the axial gap type motor 10 of the present embodiment, the protruding portion 23a is provided on the housing facing surface 21b of the yoke portion 21 of the stator 12, and the protruding portion 23a is fitted to the disc portion 14 of the housing 13. Since the concavity 14a is provided, even when the motor 10 is used for a long time and the winding generates heat, the contact area between the stator core 25 and the disk portion 14 of the housing 13 is increased to improve the heat dissipation. 12 can be cooled. Further, it is not necessary to provide a storage space for storing the coolant in the housing 13, and the axial width of the motor 10 is not increased. Further, since the stator is cooled without using a coolant, a special structure is used to ensure the insulation between the winding 26 and the stator core 25 even when the rotor core 25 is formed by winding the magnetic plate 50 in a wound manner. There is no need to provide it. Furthermore, the stator 12 and the housing 13 can be firmly fixed.

  Further, according to the axial gap type motor 10 of the present embodiment, since a plurality of the protrusions 23a are formed concentrically, there is no thermal imbalance depending on the position in the circumferential direction, and the cooling efficiency is reduced due to the thermal imbalance. Can be prevented.

  Further, according to the axial gap type motor 10 of the present embodiment, the housing 13 can be integrally formed by being cast into the stator core 25 formed with the projecting portion 23 a, and thereby the contact surface between the stator 12 and the housing 13 can be formed. Adhesion can be improved. In addition, the degree of freedom in shape of the stator core 25 can be improved and the strength can be improved.

In addition, the shape and arrangement | positioning of the protrusion part 23a are not limited to this, As long as it arrange | positions substantially uniformly in the circumferential direction, it can change suitably.
<Second Embodiment>
Next, an axial gap type motor according to a second embodiment will be described with reference to FIGS.
The axial gap type motor of the second embodiment is different from the axial gap type motor of the first embodiment in the shape and arrangement of the protrusions formed on the yoke-facing surface facing the housing. Since the other parts are the same as those of the axial gap type motor according to the first embodiment of the present invention, the same or equivalent parts are denoted by the same or corresponding symbols, and the description thereof is simplified or omitted.

  In the axial gap type motor 10A of the present embodiment, the housing facing surface 21b of the yoke portion 21 is formed with a plurality of projecting portions 23b,..., 23b extending radially in the radial direction. The slot formed between the teeth 22 adjacent to each other in the circumferential direction formed on the rotor facing surface 21a is disposed in a region projected onto the housing facing surface 21b.

  The disk portion 14 of the housing 13 has recesses 14b,..., 14b, which are respectively fitted to the plurality of protrusions 23b,. Are provided in plurality.

  In order to manufacture the stator core 25, the stator core 25 has a width equivalent to the axial length from the tip of the tooth 22 formed on the rotor facing surface 21a of the yoke portion 21 to the tip of the protruding portion 23b formed on the housing facing surface 21b. A notch portion 52 for slot is punched and formed on the magnetic plate 50 so as to leave a tooth piece 51 constituting the tooth 22 on one side in the width direction using a press molding machine (not shown), and a protruding portion 23b on the other side in the width direction. The projecting portion cutout portion 56 is punched and formed so that the projecting portion piece 55 constituting the above portion is left at a position corresponding to the slot cutout portion 52 on one side in the width direction. Here, the cutout portion 56 for the protruding portion is formed by chamfering the corner portion at the tip of the protruding piece 55 into an R shape to form chamfered portions 57 and 57 (thermal stress relaxation portions).

  Then, as in the first embodiment, the magnetic plate 50 in which the slot cutout portion 52 and the protrusion cutout portion 56 are formed is fixed on a spiral core 60 and wound to thereby form a stator core. 25 is manufactured.

  As described above, according to the axial gap type motor 10A of the present embodiment, since a plurality of the protrusions 23b, ..., 23b are formed radially, there is no thermal imbalance depending on the circumferential position, and the thermal imbalance is eliminated. It is possible to prevent the cooling efficiency from being lowered.

  Further, according to the axial gap type motor 10A of the present embodiment, the protruding portion 23b is provided on the back surface portion of the slot so as to avoid the back surface portion of the tooth 22, so that magnetic flux is generated from the tooth 22 to the housing 13 via the protruding portion 23b. Leakage can be prevented and reduction in motor output due to magnetic flux leakage can be suppressed.

  Further, according to the axial gap type motor 10A of the present embodiment, since the protruding portion 23b is formed with the chamfered portion 57 at the contact portion with the concave portion 14b of the housing 13, the protruding portion 23b protrudes when the housing 13 is manufactured by casting. When the portion 23b and the recess 14b are in surface contact and the housing 13 is manufactured by cutting, a slight space is secured at the corner of the recess 14b and the protrusion 23b. In any case, the stator 12 and the housing 13 are secured. The stress concentration due to the difference in coefficient of thermal expansion can be alleviated. Thereby, it can avoid that stress concentrates on the corner | angular part of the protrusion part 23b, and the corner part of the recessed part 14b. Note that the chamfered portion 57 does not necessarily have to be chamfered in an R shape, and the same effect can be achieved even if the chamfered portion is chamfered.

  In addition, this invention is not limited to what was illustrated to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

  For example, as shown in FIG. 8, a heat transfer material layer 70 made of a resin material such as silicon grease may be interposed between the housing facing surface 21 b of the yoke portion 21 and the disc portion 14 of the housing 13. Thereby, the adhesiveness in the contact surface of the housing opposing surface 21b of the yoke part 21 and the disc part 14 of the housing 13 can be ensured, an air layer can be eliminated and heat dissipation can be improved. Further, by incorporating a material having a high heat transfer coefficient into the heat transfer material layer 70, for example, a material having a high heat transfer coefficient such as iron, heat transfer is promoted and heat dissipation can be improved. In addition, by including a non-magnetic material such as aluminum or copper, the magnetic flux leakage can be suppressed while further improving heat dissipation. When the heat transfer material layer 70 is interposed, the housing 13 and the stator core 25 must be formed and then joined together with the heat transfer material layer 70 interposed.

  The axial gap type motor of the present invention is not limited to the substantially Halbach type, and a nonmagnetic member may be provided in the submagnet portion 32 instead of the subpermanent magnet piece 43.

  Furthermore, in the above-described embodiment, the stator 12 may be provided only on one side in the direction of the rotation axis O, and the sub permanent magnet portion 32 may be provided only on the side facing the stator 12.

It is sectional drawing of the axial gap type motor of 1st Embodiment. It is a disassembled perspective view of the axial gap type motor of 1st Embodiment. FIG. 3 is an exploded perspective view of an axial gap type motor showing components other than the rotor frame separated from the rotor frame of the rotor of FIG. 2. It is a figure of the magnetic board which comprises the stator core of 1st Embodiment. It is explanatory drawing explaining the process of winding the magnetic board of FIG. It is a disassembled perspective view of the axial gap type motor of 2nd Embodiment. It is a figure of the magnetic board which comprises the stator core of 2nd Embodiment. It is sectional drawing of the contact part of the stator which concerns on a modification, and a housing. 2 is a cross-sectional view of an axial gap type motor described in Patent Document 1. FIG. 10 is a cross-sectional view of another axial gap type motor described in Patent Document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Axial gap type motor 11 Rotor 12 Stator 13 Housing 14 Disk part 14a, 14b Recessed part 21 Yoke part 22 Teeth 23a, 23b Protruding part 25 Stator core 26 Winding 50 Magnetic plate 51 Teeth piece 53, 55 Protruding part piece 57 Chamfered part ( Thermal stress relaxation part)
70 Heat transfer material layer O Rotating shaft

Claims (9)

A rotor rotatable around a rotation axis;
A substantially annular plate-shaped yoke portion that is arranged to face the rotor from at least one side in the rotational axis direction, and a plurality of teeth that protrude from the rotor-facing surface of the yoke portion toward the rotor and radially extend in the radial direction; A stator configured by winding a winding around a stator core composed of
An axial gap type motor comprising a housing for holding the stator,
The stator is formed by winding a tape-like magnetic plate, and has a protruding portion that is arranged substantially uniformly in the circumferential direction on the housing facing surface opposite to the rotor facing surface of the yoke portion,
The housing has a recess that fits into the protrusion.
An axial gap type motor characterized by that. A plurality of the protrusions are formed concentrically.
The axial gap type motor according to claim 1. A plurality of the protrusions are formed radially,
The axial gap type motor according to claim 1. Each of the protrusions is disposed in a region where a slot formed between the teeth adjacent in the circumferential direction of the rotor facing surface of the yoke portion is projected onto the housing facing surface.
The axial gap type motor according to claim 3. The protruding portion has a thermal stress relaxation portion that relaxes thermal stress at a contact portion with the concave portion of the housing.
The axial gap type motor according to any one of claims 1 to 4, wherein the motor is an axial gap type motor. A heat transfer material layer is interposed between the stator core and the housing;
An axial gap type motor according to any one of claims 1 to 5, wherein: The heat transfer material layer is made of a resin material containing a material having a high heat transfer coefficient.
The axial gap type motor according to claim 6. The housing is formed by casting into the stator core in which the protrusion is formed.
An axial gap type motor according to any one of claims 1 to 5, wherein: The stator core is configured by winding the magnetic plate having a tooth piece constituting the tooth on one side in the width direction and having a protruding piece piece constituting the protruding portion on the other side in the width direction.
An axial gap type motor according to any one of claims 1 to 8, wherein

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