JP4605480B2 - Axial gap type motor - Google Patents

Description

  The present invention relates to an axial gap type motor, and more particularly to improvement of a rotor.

  Conventionally, for example, a shaft having a pair of stators arranged so as to sandwich the rotor from both sides in the direction of the rotation axis and forming a magnetic flux loop via the pair of stators with respect to a field magnetic flux generated by a permanent magnet of the rotor Gap-type permanent magnet synchronous machines are known (see, for example, Patent Documents 1 and 2).

JP-A-10-271784 JP 2001-136721 A

  The permanent magnet synchronous machine according to Patent Document 1 is an axial gap type as a permanent magnet synchronous machine in which a stator is arranged opposite to a rotor constituted by a bipolar magnet or a rotor constituted by combining a unipolar magnet and a magnetic material. The motor is configured. Further, the permanent magnet synchronous machine according to Patent Document 2 constitutes an axial gap type motor as a permanent magnet synchronous machine by disposing a stator opposite to a rotor using a bipolar magnet and a fan-shaped salient magnetic material. .

  Further, an axial gap type motor 100 as shown in FIG. 9 is known as a permanent magnet synchronous machine according to Patent Documents 1 and 2. The axial gap motor 100 includes a rotor 101 that can rotate around a rotation axis, and a pair of stators 102 that are opposed to each other so as to sandwich the rotor 101 from both sides in the rotation axis direction. Magnetic circuit elements such as the magnet portion 103, the sub magnet portion 104, and the magnetic member 105 are housed in a rotor frame 106 made of a nonmagnetic material. The rotor frame 106 includes a plurality of ribs 107 that are arranged in the circumferential direction at predetermined intervals and extend in the radial direction, and a shaft portion 108 and a rim portion 109 that are connected by the plurality of ribs 107.

  By the way, in the axial gap type motor 100, when the rotor 101 rotates at a high speed, a large centrifugal force acts on the rim portion 109 of the rotor frame 106. Therefore, as shown in FIG. As shown, there was a possibility of deformation to the outside in the radial direction. Further, due to the deformation of the rim portion 109, there is a possibility that the main magnet portion 103, the sub magnet portion 104, and the magnetic member 105 are likely to be scattered outward in the axial direction.

  The present invention has been made in view of the above circumstances, and its purpose is to improve the rigidity of the rim portion of the rotor frame and to minimize deformation of the rim portion due to centrifugal force during high rotation. It is to provide an axial gap type motor that can be used.

To achieve the above object, the invention described in claim 1 includes a rotor (for example, the rotor 11 in the embodiment) that can rotate around a rotation axis (for example, the rotation axis O in the embodiment), An axial gap type motor including a stator (for example, the stator 12 in the embodiment) disposed opposite to the rotor from at least one side in the rotation axis direction. The rotor is disposed at a predetermined interval in the circumferential direction. A plurality of ribs extending in the radial direction (for example, the rib 21 in the embodiment), shaft portions (for example, the shaft portion 22 in the embodiment) provided respectively on the inner diameter side and the outer diameter side of the plurality of ribs, and A rotor frame (for example, the rotor frame 20 in the embodiment) having a rim portion (for example, the rim portion 23 in the embodiment) and a rib magnetized in the rotation axis direction and adjacent in the circumferential direction. Each of the main magnet portions (for example, the main magnet portion 41 in the embodiment) arranged and magnetized in a direction orthogonal to the rotation axis direction and the radial direction and arranged on at least one side of the rib rotation axis direction. A plurality of sub-magnet parts (for example, the sub-magnet part 43 in the embodiment), and in the cross section in the rotation axis direction of the rim part, the rib is thicker than the thickness of the region projected in the radial direction. A rigid portion (for example, the rigid portion 25 in the embodiment) is formed on the outer periphery of the rim portion in a region where the sub-magnet portion is projected in the radial direction, and the inner diameter of the rim portion is axially outward from the axial center of the rim portion. It is characterized in that it is inclined so as to gradually become a small diameter as it goes to .

The invention according to claim 2 is an axial gap type motor comprising: a rotor rotatable around a rotation axis; and a stator arranged to face the rotor from at least one side in the rotation axis direction. A rotor frame having a plurality of ribs arranged at predetermined intervals in the direction and extending in the radial direction, and a shaft portion and a rim portion provided respectively on the inner diameter side and the outer diameter side of the plurality of ribs, and magnetized in the rotation axis direction A main magnet portion disposed between ribs adjacent to each other in the circumferential direction, and a magnetic member (for example, the magnetic member 42 in the embodiment) disposed on at least one side surface in the rotation axis direction of the main magnet portion. In the cross section in the rotational axis direction of the rim portion, a thick rigid portion is formed on the outer periphery of the rim portion in the region in which the magnetic member is projected in the radial direction. is formed, The inner diameter of the arm portion, characterized in that they are gradually inclined so that the small diameter toward the axial center of the rim portion axially outwardly.

  In the invention described in claim 3, in addition to the configuration of the invention described in claim 1 or 2, the rigid portion has an annular member (for example, the annular member 26 in the embodiment) on the outer periphery of the rim portion. It is provided by mounting.

The invention according to claim 4 is characterized in that, in addition to the configuration of the invention according to any one of claims 1 to 3 , the rigid portion is made of a nonmagnetic material.

According to the axial gap type motor according to claim 1, the rigid portion is formed in the region in which the secondary magnet portion is projected in the radial direction with respect to the region in which the rib is projected in the radial direction in the cross section in the rotation axis direction of the rim portion. Therefore, the rigidity of the rim portion of the rotor frame can be improved. Thereby, the deformation | transformation of the rim | limb part by the centrifugal force at the time of high rotation can be suppressed to the minimum. Further, the inner diameter of the rim portion is inclined so as to gradually become smaller as it goes from the axial center of the rim portion toward the outer side in the axial direction, so that the axial end portion of the rim portion is deformed so as to open outward in the radial direction. Since the main magnet portion, the sub magnet portion, and the magnetic member are engaged with the inclined surface, the main magnet portion, the sub magnet portion, and the magnetic member can be prevented from shifting outward in the axial direction. It is possible to prevent the magnet portion, the sub magnet portion, and the magnetic member from being scattered outward in the axial direction.

According to the axial gap type motor according to claim 2, in the cross section in the rotation axis direction of the rim portion, the rigid portion is formed in the region in which the magnetic member is projected in the radial direction with respect to the region in which the main magnet portion is projected in the radial direction. Therefore, the rigidity of the rim portion of the rotor frame can be improved. Thereby, the deformation | transformation of the rim | limb part by the centrifugal force at the time of high rotation can be suppressed to the minimum. Further, the inner diameter of the rim portion is inclined so as to gradually become smaller as it goes from the axial center of the rim portion toward the outer side in the axial direction, so that the axial end portion of the rim portion is deformed so as to open outward in the radial direction. However, since the main magnet portion and the magnetic member are engaged with the inclined surface, the main magnet portion and the magnetic member can be prevented from being shifted outward in the axial direction , and the main magnet portion and the magnetic member are moved outward in the axial direction. It can prevent falling apart.

  According to the axial gap type motor of the third aspect, since the rigid portion is provided by mounting the annular member on the outer periphery of the rim portion, if the annular member is molded using a material having high tensile strength. Since the rotor frame can be formed of a material having a relatively low strength, that is, an inexpensive material, the manufacturing cost of the rotor can be reduced. Further, since the annular member has a simple shape that can be easily processed, the productivity is high, the manufacturing cost can be reduced, and the deformation of the rim portion can be effectively suppressed.

According to the axial gap type motor of the fourth aspect , since the rigid portion is made of a nonmagnetic material, it is possible to prevent the magnetic flux from being short-circuited through the rigid portion. As a result, it is possible to prevent a reduction in motor generated torque and a reduction in efficiency.

  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)
First, with reference to FIGS. 1-3, 1st Embodiment of the axial gap type motor which concerns on this invention is described.

  As shown in FIG. 1, the axial gap type motor 10 of the present embodiment includes a substantially annular rotor 11 that is rotatably provided around the rotational axis O of the axial gap type motor 10, and the axial direction of the rotational axis O (hereinafter referred to as “rotating axis O”). A pair of stators 12, 12 each having a plurality of stator windings that are arranged so as to sandwich the rotor 11 from both sides thereof and generate a rotating magnetic field that rotates the rotor 11. Prepare.

  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 the output shaft is connected to the input shaft of a transmission (not shown), so that 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 to reduce the kinetic energy of the vehicle body. It is recovered as electrical energy (regenerative energy). Further, for example, in a hybrid vehicle, when the rotor 11 of the axial gap type motor 10 is connected to the crankshaft of the internal combustion engine (not shown), the output of the internal combustion engine is transmitted to the axial gap type motor 10 and the axial gap. The mold motor 10 functions as a generator and generates power generation energy.

  The stator 12 protrudes toward the rotor 11 along the axial direction from a position at a predetermined interval in the circumferential direction on the substantially annular plate-shaped yoke portion 13 and the facing surface of the yoke portion 13 facing the rotor 11. A plurality of teeth 14,..., 14 extending in the radial direction, and stator windings (not shown) mounted between the appropriate teeth 14, 14 are provided.

The stator 12 is, for example, a 6N type having six main poles (for example, U ⁺ , V ⁺ , W ⁺ , U ⁻ , V ⁻ , W ⁻ ), and each stator 12 has a U ⁺ , The U ⁻ , V ⁻ , and W ⁻ poles of the other stator 12 are set to face each other in the axial direction with respect to the V ⁺ and W ⁺ poles. For example, three teeth 14 of one stator 12 corresponding to one of U ⁺ , V ⁺ , W ⁺ poles and one of U ⁻ , V ⁻ , W ⁻ poles with respect to a pair of stators 12, 12 opposed in the axial direction. , 14, 14 and three teeth 14, 14, 14 of the other stator 12 corresponding to the other of the U ⁺ , V ⁺ , W ⁺ pole and the other of the U ⁻ , V ⁻ , W ⁻ pole, The energized state of the teeth 14 of one stator 12 and the teeth 14 of the other stator 12 which are set so as to face each other and are opposed in the axial direction is set so as to be reversed by an electrical angle.

  As shown in FIGS. 1 and 2, the rotor 11 includes a rotor frame 20, a plurality of magnet pole portions 40,..., 40 and a plurality of magnet pole portions 40 accommodated in the rotor frame 20 in a state of being alternately arranged in the circumferential direction. Sub-magnet parts 43, ..., 43.

  The rotor frame 20 is made of a nonmagnetic material such as stainless steel or aluminum, and as shown in FIGS. 1 and 3, the rotor frame 20 is arranged at a predetermined interval in the circumferential direction and extends in the radial direction. The ribs 21,..., The shaft part 22 and the rim part 23 connected by the plurality of ribs 21, extend radially inward from the axial center of the inner peripheral surface of the shaft part 22, and have an external drive shaft (for example, An annular plate-like connection portion 24 connected to an input shaft or the like of a vehicle transmission. In the present embodiment, the rib 21 is formed in a prismatic shape having a constant axial width and a circumferential width.

  The magnet pole portion 40 includes a substantially fan-shaped main magnet portion 41 magnetized in the thickness direction (that is, the axial direction), a pair of magnetic members 42 sandwiching the main magnet portion 41 from both sides in the thickness direction, The main magnet portion 41 is sandwiched from both sides in the circumferential direction by the ribs 21 adjacent in the circumferential direction, and is accommodated in the rotor frame 20. . And the main magnet parts 41 and 41 adjacent to the circumferential direction are set so that a magnetization direction may become a mutually different direction. The magnetic member 42 may have a configuration in which a plurality of electromagnetic steel plates are laminated, or may be manufactured by molding and sintering powder such as iron powder.

  The sub magnet part 43 is a magnet having a substantially rectangular cross section magnetized in a direction orthogonal to the axial direction and the radial direction (that is, substantially circumferential direction), and is sandwiched between the shaft part 22 and the rim part 23 from both sides in the radial direction. The ribs 21 are accommodated in the rotor frame 20 so as to be located on both sides in the axial direction (in other words, on both sides in the circumferential direction of the magnetic member 42).

  In the present embodiment, as shown in FIG. 3, in the axial section of the rim portion 23, a region in which the secondary magnet portion 43 is projected in the radial direction with respect to a region in which the rib 21 is projected in the radial direction, that is, a rim. Thick rigid portions 25 are formed at both axial ends of the outer periphery of the portion 23. 3 represents the centrifugal force acting on the rim portion 23.

  As described above, according to the axial gap type motor 10 of the present embodiment, the secondary magnet portion 43 is projected in the radial direction with respect to the region where the rib 21 is projected in the radial direction in the axial section of the rim portion 23. Since the rigid portion 25 is formed in the region, the rigidity of the rim portion 23 of the rotor frame 20 can be improved. Thereby, the deformation | transformation of the rim | limb part 23 by the centrifugal force at the time of high rotation can be suppressed to the minimum. Further, since the deformation of the rim portion 23 is suppressed to the minimum, it is possible to prevent the main magnet portion 41, the sub magnet portion 43, and the magnetic member 42 from being scattered outward in the axial direction.

  Further, according to the axial gap type motor 10 of the present embodiment, since the rotor frame 20 (the rigid portion 25) is made of a nonmagnetic material, it is possible to prevent the magnetic flux from being short-circuited through the rotor frame 20. . As a result, it is possible to prevent the torque generated by the motor 10 from decreasing and the efficiency from decreasing.

(Second Embodiment)
Next, a second embodiment of the axial gap type motor according to the present invention will be described with reference to FIG. The axial gap type motor of this embodiment is the same as the axial gap type motor of the first embodiment except that an annular member is provided on the outer peripheral surface of the rim portion. Or the equivalent code | symbol is attached | subjected and the description is simplified or abbreviate | omitted.

  As shown in FIG. 4, the rotor frame 20 of the present embodiment has a constant thickness in the rim portion 23 and is made of a nonmagnetic material by press-fitting or shrink fitting on the outer peripheral surface of the rim portion 23. The annular member 26 is fixed. This annular member 26 has substantially the same axial width as that of the rim portion 23, and the auxiliary magnet portion 43 is provided to the region in which the rib 21 is projected in the radial direction in the section of the rim portion 23 in the rotational axis direction. Thick rigid portions 27 are formed at regions projected in the radial direction, that is, at both ends in the axial direction on the outer periphery of the annular member 26. In addition, the arrow in FIG. 4 represents the centrifugal force which acts on the rim | limb part 23 and the annular member 26. FIG.

  As described above, according to the axial gap type motor 10 of the present embodiment, the rigid portion 27 is provided by mounting the annular member 26 on the outer periphery of the rim portion 23. Therefore, the tensile strength of the annular member 26 is increased. If the material is molded using a high material, the rotor frame 20 can be formed of a material having a relatively low strength, that is, an inexpensive material, and thus the manufacturing cost of the rotor 11 can be reduced. Further, since the annular member 26 has a simple shape that can be easily processed, the productivity is high, the manufacturing cost can be reduced, and the deformation of the rim portion 23 can be effectively suppressed.

  Moreover, according to the axial gap type motor 10 of this embodiment, since the annular member 26 (rigid part 27) consists of nonmagnetic materials, it prevents that a magnetic flux short-circuits through the annular member 26. FIG. Can do. As a result, it is possible to prevent the torque generated by the motor 10 from decreasing and the efficiency from decreasing.

Further, according to the axial gap type motor 10 of the present embodiment, the annular member 26 is fixed to the outer peripheral surface of the rim portion 23 by press-fitting or shrink-fitting, so that compressive stress is constantly acting on the rim portion 23. . For this reason, when the rotor 11 rotates and the tensile stress due to the centrifugal force acts on the rim portion 23, the tensile stress and the compressive stress cancel each other, so that the stress acting on the rim portion 23 can be reduced.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

(Third embodiment)
Next, a third embodiment of the axial gap type motor according to the present invention will be described with reference to FIG. The axial gap type motor of this embodiment is the same as the axial gap type motor of the first embodiment except that the magnetic member and the secondary magnet portion are held by tapered surfaces from both sides in the radial direction. Parts are denoted by the same or corresponding symbols, and the description thereof is simplified or omitted.

  The rotor frame 50 of the present embodiment is formed of, for example, stainless steel or aluminum that is a non-magnetic material. As shown in FIG. 5, a plurality of rotor frames 50 are arranged at predetermined intervals in the circumferential direction and extend in the radial direction. , 51, a rim portion 53 and an annular plate-like connection portion 54 connected by a plurality of ribs 51, ring members 52, 52 respectively disposed on both sides in the axial direction of the connection portion 54, Is provided.

  The ring member 52 is an annular member having a substantially L-shaped cross section, and includes an annular portion 52a and a flange portion 52b extending outward in the axial direction from a radially outer end portion of the annular portion 52a. The connecting portion 54 is fastened to the side surface in the axial direction by a bolt 55.

  In the present embodiment, as shown in FIG. 5, in the axial section of the rim portion 53, a region in which the secondary magnet portion 43 is projected in the radial direction with respect to a region in which the rib 51 is projected in the radial direction, that is, a rim. Thick rigid portions 25 are formed at both axial ends of the outer periphery of the portion 53. Note that the arrow in FIG. 5 represents the centrifugal force acting on the rim portion 53.

  In the present embodiment, the inner peripheral surface of the rim portion 53 is formed at the center in the axial direction, is formed on the planar inner surface 53a parallel to the rotation axis O, and on both sides in the axial direction of the planar inner surface 53a. And a tapered inner surface 53b that is inclined so as to gradually decrease in diameter from the axial center of the rim portion 53 toward the outer side in the axial direction. Further, the outer peripheral surface of the flange portion 52b of the ring member 52 has a tapered outer surface 52c that is inclined so as to gradually increase in diameter from the annular portion 52a side toward the outer side in the axial direction. Accordingly, the tapered inner surface 53b of the rim portion 53 and the tapered outer surface 52c of the ring member 52 are arranged so as to face each other in the radial direction.

  In the present embodiment, the outer peripheral surfaces of the magnetic member 42 and the sub magnet portion 43 are formed at the same inclination angle as the tapered inner surface 53 b of the rim portion 53, and the inner peripheral surfaces of the magnetic member 42 and the sub magnet portion 43. Is formed at the same inclination angle as the tapered outer surface 52 c of the ring member 52. Thereby, the magnetic member 42 and the sub magnet part 43 are hold | maintained so that it may be hold | maintained from the radial direction both sides by the taper-shaped inner surface 53b of the rim | limb part 53, and the taper-shaped outer surface 52c of the ring member 50.

As described above, according to the axial gap type motor 10 of the present embodiment, the inner peripheral surface of the rim portion 53 is inclined so that the diameter gradually decreases from the axial center of the rim portion 53 toward the outer side in the axial direction. Therefore, even if the axial end of the rim portion 53 is deformed so as to open radially outward, the main magnet portion 41, the sub magnet portion 43, and the magnetic member 42 are formed on the tapered inner surface 53b. Since they are engaged, it is possible to prevent the main magnet portion 41, the sub magnet portion 43, and the magnetic member 42 from shifting outward in the axial direction.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

(Fourth embodiment)
Next, a fourth embodiment of an axial gap type motor according to the present invention will be described with reference to FIG. In addition, in the axial gap type motor of this embodiment, the annular member of 2nd Embodiment is provided in the outer peripheral surface of the rim | limb part of the rotor frame of 3rd Embodiment of 1st-3rd Embodiment. Since it is the same as that of an axial gap type motor, the same reference numerals are assigned to the same parts, and the description thereof is simplified or omitted.

As shown in FIG. 6, the rotor frame 50 according to the present embodiment has an outer peripheral surface of the rim portion 53 that is flush with the outer peripheral surface of the rim portion 53 and is made of a nonmagnetic material by press-fitting or shrink fitting. The annular member 26 is fixed.
About another structure and an effect, it is the same as that of the said 1st-3rd embodiment.

(Fifth embodiment)
Next, a fifth embodiment of the axial gap motor according to the present invention will be described with reference to FIGS. The axial gap type motor according to the first embodiment is not provided with the auxiliary magnet portion, and the axial width of the rib of the rotor frame is substantially the same as that of the rim portion. Since it is the same as that of a motor, the same parts are denoted by the same or corresponding reference numerals, and the description thereof will be simplified or omitted.

  As shown in FIGS. 7 and 8, the rotor 11 of the present embodiment includes a rotor frame 60 and a plurality of magnet pole portions 40,..., 40 accommodated in the rotor frame 60 in a state of being arranged in the circumferential direction. Prepare.

  The rotor frame 60 is made of a nonmagnetic material such as stainless steel or aluminum. As shown in FIGS. 7 and 8, the rotor frame 60 is arranged at a predetermined interval in the circumferential direction and extends in the radial direction. 61, a shaft portion 62 and a rim portion 63 connected by a plurality of ribs 61, and an annular plate-like connecting portion 64 extending radially inward from the axial center of the inner peripheral surface of the shaft portion 62. And comprising. In the present embodiment, the rib 61 is formed in a plate shape having an axial width substantially the same as that of the rim portion 63 and a constant circumferential width.

  In the present embodiment, as shown in FIG. 8, in the axial cross section of the rim portion 63, the region in which the magnetic member 42 is projected in the radial direction with respect to the region in which the main magnet portion 41 is projected in the radial direction, that is, Thick rigid portions 25 are formed at both ends in the axial direction on the outer periphery of the rim portion 63. In addition, the arrow in FIG. 8 represents the centrifugal force which acts on the rim | limb part 63. FIG.

As described above, according to the axial gap type motor 10 of the present embodiment, the magnetic member 42 is projected in the radial direction with respect to the region in which the main magnet portion 41 is projected in the radial direction in the axial section of the rim portion 63. Since the rigid portion 25 is formed in the region, the rigidity of the rim portion 63 of the rotor frame 60 can be improved. Thereby, the deformation | transformation of the rim | limb part 63 by the centrifugal force at the time of high rotation can be suppressed to the minimum. In addition, since the deformation of the rim portion 63 is suppressed to the minimum, it is possible to prevent the main magnet portion 41 and the magnetic member 42 from being separated outward in the axial direction.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

  As a modification of the present embodiment, the annular member 26 is fixed to the outer peripheral surface of the rim portion 63 with the wall thickness of the rim portion 63 being constant in the axial direction as in the second embodiment of FIG. It may be. Further, as in the third embodiment of FIG. 5, a tapered inner surface 53 b is provided on the inner peripheral surface of the rim portion 63, and the magnet pole portion 40 is moved in cooperation with the tapered outer surface 52 c of a separate ring member 52. You may make it hold | maintain so that it may hold from both radial directions. Moreover, you may make it combine 2nd and 3rd Embodiment like 4th Embodiment of FIG.

It is a disassembled perspective view for demonstrating 1st Embodiment of the axial gap type motor which concerns on this invention. It is a front view of the rotor shown in FIG. FIG. 3 is a cross-sectional view of the main part of the rotor shown in FIG. 2, (a) is a cross-sectional view taken along line AA in FIG. 2, and (b) is a cross-sectional view taken along line BB in FIG. It is principal part sectional drawing of the rotor of 2nd Embodiment, (a) is sectional drawing equivalent to the AA line of FIG. 2, (b) is sectional drawing equivalent to the BB line of FIG. It is principal part sectional drawing of the rotor of 3rd Embodiment, (a) is sectional drawing equivalent to the AA line of FIG. 2, (b) is sectional drawing equivalent to the BB line of FIG. It is principal part sectional drawing of the rotor of 4th Embodiment, (a) is sectional drawing equivalent to the AA line of FIG. 2, (b) is sectional drawing equivalent to the BB line of FIG. It is a disassembled perspective view for demonstrating the axial gap type motor of 5th Embodiment. FIG. 8 is a cross-sectional view of the main part of the rotor shown in FIG. 7, where (a) is a cross-sectional view corresponding to the line AA in FIG. 2, and (b) is a cross-sectional view corresponding to the line BB in FIG. It is a disassembled perspective view for demonstrating the conventional axial gap type motor. FIG. 10 is a cross-sectional view of a main part of the rotor illustrated in FIG. 9, where (a) is a cross-sectional view corresponding to the line AA in FIG. 2, and (b) is a cross-sectional view corresponding to the line BB in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Axial gap type motor 11 Rotor 12 Stator 20 Rotor frame 21 Rib 22 Shaft part 23 Rim part 25 Rigid part 26 Ring member 27 Rigid part 40 Magnet pole part 41 Main magnet part 42 Magnetic member 43 Sub magnet part 50 Rotor frame 51 Rib 52 ring member 52a annular part 52b collar part 52c tapered outer surface (inclined surface)
53 Rim part 53a Planar inner surface 53b Tapered inner surface (inclined surface)
60 Rotor frame 61 Rib 62 Shaft part 63 Rim part O Rotating shaft

Claims (4)

An axial gap type motor comprising: a rotor rotatable around a rotation axis; and a stator disposed opposite to the rotor from at least one side in the rotation axis direction;
The rotor includes a plurality of ribs that are arranged at predetermined intervals in the circumferential direction and extend in the radial direction, and a shaft portion and a rim portion that are respectively provided on an inner diameter side and an outer diameter side of the plurality of ribs; ,
A main magnet portion magnetized in the rotation axis direction and disposed between the ribs adjacent in the circumferential direction;
A plurality of sub-magnet portions magnetized in a direction perpendicular to the rotation axis direction and the radial direction, and disposed on at least one side of the rotation axis direction of the rib,
In the cross section in the rotational axis direction of the rim portion, a thick rigid portion is formed on the outer periphery of the rim portion in the region in which the auxiliary magnet portion is projected in the radial direction compared to the thickness in the region in which the rib is projected in the radial direction. ,
An axial gap type motor , wherein the inner diameter of the rim portion is inclined so as to gradually become smaller as it goes from the axial center of the rim portion toward the outer side in the axial direction . An axial gap type motor comprising: a rotor rotatable around a rotation axis; and a stator disposed opposite to the rotor from at least one side in the rotation axis direction;
The rotor includes a plurality of ribs that are arranged at predetermined intervals in the circumferential direction and extend in the radial direction, and a shaft portion and a rim portion that are respectively provided on an inner diameter side and an outer diameter side of the plurality of ribs; ,
A main magnet portion magnetized in the rotation axis direction and disposed between the ribs adjacent in the circumferential direction;
A magnetic member disposed on at least one side surface in the rotation axis direction of the main magnet portion,
In the cross section in the rotation axis direction of the rim portion, a thick rigid portion is formed on the outer periphery of the rim portion in the region where the magnetic member is projected in the radial direction compared to the thickness of the region where the main magnet portion is projected in the radial direction. And
An axial gap type motor , wherein the inner diameter of the rim portion is inclined so as to gradually become smaller as it goes from the axial center of the rim portion toward the outer side in the axial direction .   The axial gap motor according to claim 1, wherein the rigid portion is provided by mounting an annular member on an outer periphery of the rim portion. The rigid portion, the axial gap motor according to any one of claims 1 to 3, characterized in that it consists of non-magnetic material.

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