JP2010088182A - Axial gap type motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axial gap type motor in which a rotor frame can easily be manufactured. <P>SOLUTION: A rotor includes: a rotor frame; a plurality of main permanent magnet pieces arranged between radial ribs 35, 35 which are adjacent to each other in the circumferential direction; a plurality of sub permanent magnet pieces which are magnetized in a direction orthogonal to the direction of a rotating shaft O and the radial direction, and arranged at least at one side of the direction of the rotating shaft O of the radial rib 35; and a plurality of magnetic members arranged between the sub permanent magnet pieces which are adjacent with each other in the circumferential direction. The rotor frame is composed of first, second and third rotor frames 33A, 33B and 33C, the second rotor frame 33B holds the main permanent magnet pieces arranged between the radial ribs 35, 35, and the first and third rotor frames 33A, 33C hold at least either of the magnetic members or the sub permanent magnet pieces, and are arranged so as to sandwich the second rotor frame 33B from both sides of the direction of the rotating shaft O. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an axial gap type motor.

  2. Description of the Related Art 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 magnetic flux loop is known (see, for example, Patent Document 1).

  As shown in FIG. 10, the axial gap motor 100 described in Patent Document 1 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 be sandwiched from both sides in the rotation axis direction. The rotor 101 is configured such that magnetic circuit elements such as a main magnet piece 103, a sub magnet piece 104, and a magnetic member 105 are accommodated 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.

JP 2008-104278 A

  In this axial gap type motor 100, it is necessary to manufacture the rotor frame 106 by cutting, but the rotor frame 106 has a width (length in the axial direction) for cutting out from one member (solid material having a columnar shape or a cylindrical shape). ) Is long, and it takes a long time to manufacture the rotor frame 106.

  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 easily manufacturing a rotor frame.

In order to achieve the above object, the invention described in claim 1
A rotor (rotor 11 in an embodiment described later) rotatable around a rotation axis;
An axial gap type motor (axial gap type motor 10 in an embodiment to be described later) comprising a stator (stator 12 in an embodiment to be described later) opposed to the rotor from at least one side in the rotation axis direction,
The rotor is
A plurality of ribs (radial ribs 35 in the embodiment described later) arranged at predetermined intervals in the circumferential direction and extending in the radial direction, and shaft portions (described later) provided on the inner diameter side and the outer diameter side of the plurality of ribs, respectively. A rotor frame (rotor frame 33 in an embodiment described later) having a shaft portion 36 in the embodiment) and a rim portion (rim portion 37 in an embodiment described later);
A plurality of main magnet pieces (main permanent magnet pieces 41 in the embodiments described later) magnetized in the rotation axis direction and respectively disposed between the ribs adjacent in the circumferential direction;
A plurality of sub-magnet pieces (sub-permanent magnet pieces 43 in the embodiments described later) 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;
A plurality of magnetic members (magnetic members 42 in the embodiments described later) disposed between the sub magnet pieces adjacent in the circumferential direction,
The rotor frame is
It consists of first, second and third rotor frames (first, second and third rotor frames 33A, 33B, 33C in the embodiments described later),
The second rotor frame holds the main magnet pieces respectively disposed between the ribs;
The first and third rotor frames are arranged so as to hold at least one of the magnetic member and the sub magnet piece and sandwich the second rotor frame from both sides in the rotation axis direction.
It is characterized by that.

In order to achieve the above object, the invention described in claim 2
A rotor (rotor 11 in an embodiment described later) rotatable around a rotation axis;
An axial gap type motor (axial gap type motor 10 in an embodiment to be described later) comprising a stator (stator 12 in an embodiment to be described later) opposed to the rotor from at least one side in the rotation axis direction,
The rotor is
A plurality of ribs (radial ribs 35 in the embodiment described later) arranged at predetermined intervals in the circumferential direction and extending in the radial direction, and shaft portions (described later) provided on the inner diameter side and the outer diameter side of the plurality of ribs, respectively. A rotor frame (rotor frame 33 in an embodiment described later) having a shaft portion 36 in the embodiment) and a rim portion (rim portion 37 in an embodiment described later);
A plurality of magnet pieces (main permanent magnet pieces 41 in embodiments described later) magnetized in the rotation axis direction and respectively disposed between the ribs adjacent in the circumferential direction;
A plurality of non-magnetic members magnetized in a direction perpendicular to the rotation axis direction and the radial direction and disposed on at least one side of the rib in the rotation axis direction;
A plurality of magnetic members (magnetic members 42 in the embodiments described later) disposed between the non-magnetic members adjacent in the circumferential direction,
The rotor frame is
It consists of first, second and third rotor frames (first, second and third rotor frames 33A, 33B, 33C in the embodiments described later),
The second rotor frame holds the magnet pieces respectively disposed between the ribs;
The first and third rotor frames are arranged so as to hold at least one of the magnetic member and the nonmagnetic member and sandwich the second rotor frame from both sides in the rotation axis direction.
It is characterized by that.

In addition to the configuration of the invention described in claim 1 or 2, the invention described in claim 3
At least one of the first and third rotor frames includes a plurality of outer ribs (outer ribs 39a and 39c in the embodiments described later) arranged in the circumferential direction at predetermined intervals and extending in the radial direction,
The outer rib has a first pressing portion (an inclined portion 62 in an embodiment described later) for pressing the magnetic member.
It is characterized by that.

In addition to the configuration of the invention described in claim 3, the invention described in claim 4
The outer rib has a second pressing portion (rib main body 61 in an embodiment described later) for pressing the sub-magnet piece or the nonmagnetic member.
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
Provided with an outer ring (outer ring 50 in an embodiment described later) on the outer periphery of the rim part,
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
The second rotor frame is manufactured by punching a plate material.
It is characterized by that.

In addition to the structure of the invention in any one of Claims 1-6, the invention of Claim 7 is
The first and third rotor frames were manufactured by punching and bending a plate material,
It is characterized by that.

In addition to the configuration of the invention described in claim 2, the invention described in claim 8 includes:
At least one of the first and third rotor frames includes a plurality of outer ribs (outer ribs 39a and 39c in the embodiments described later) arranged in the circumferential direction at predetermined intervals and extending in the radial direction,
The outer rib has a first pressing portion (an inclined portion 62 in an embodiment described later) for pressing the magnetic member and a second pressing portion (a rib body 61 in an embodiment described later) for pressing the non-magnetic member,
The nonmagnetic member is attached in advance to the inner side in the rotation axis direction of the second pressing portion of the outer rib,
It is characterized by that.

  According to the first and second aspects of the present invention, the rotor frame is divided into three parts, and the second rotor frame is integrally formed by being sandwiched from both sides by the first and third rotor frames. Thereby, the width | variety (axial direction length) of each 1st-3rd rotor frame can be shortened, for example, it can also manufacture by a punching process or a bending process from a board | plate material, and manufactures a rotor frame easily. be able to. Thereby, the manufacturing efficiency of the rotor frame can be improved and the manufacturing cost can be reduced.

  According to the invention of claim 3, at least one of the first and third rotor frames includes a plurality of outer ribs that are arranged at predetermined intervals in the circumferential direction and extend in the radial direction, and the outer ribs hold the magnetic member. Since it has 1 holding | suppressing part, the movement and shift | offset | difference of the axial direction of a magnetic member can be controlled. In particular, when the magnetic member is composed of laminated steel plates, the magnetic force of the magnetic member bonded and fixed to the rotor frame decreases due to temperature rise or aging of the rotor, resulting in magnetic attraction generated between the rotor and the stator. Although the magnetic member may be displaced in the axial direction due to the fact that it cannot resist the force, the axial displacement can be regulated by the first pressing portion.

  According to the invention of claim 4, the outer rib can hold the magnetic member by the first pressing portion to restrict axial displacement, and can press the sub-magnet piece or the non-magnetic member by the second pressing portion. .

  According to the invention of claim 5, since the outer ring is provided on the outer periphery of the rim portion, it is possible to suppress the rim portion of the rotor frame from spreading outward due to centrifugal force during high-speed rotation of the rotor.

  According to the invention of claim 6, since the second rotor frame constituting the rotor frame is manufactured by punching the plate material, the rotor frame can be manufactured more easily than the conventional cutting process, and the manufacturing efficiency is improved. Can be made.

  According to invention of Claim 7, the 1st and 3rd rotor frame which comprises a rotor frame can be manufactured by stamping a board | plate material, and can also be bent, and can improve manufacturing efficiency.

  According to the invention of claim 8, a nonmagnetic member is attached in advance to the inner side in the rotation axis direction of the second pressing portion of the outer rib. For example, by welding a resinous nonmagnetic member, the nonmagnetic member is attached later. Can also improve the assembly.

  Hereinafter, an axial gap type motor according to an embodiment of 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.

  An axial gap type motor 10 according to the present embodiment includes, for example, a substantially annular rotor 11 provided to be rotatable around a rotation axis O of the axial gap type motor 10, as shown in FIGS. A pair of stators 12 and 12 having a plurality of stator windings that are arranged opposite to each other so as to sandwich the rotor 11 from both sides in the direction of the axis O and generate a rotating magnetic field that rotates the rotor 11. Yes.

  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 faces the rotor 11 along the direction of the rotation axis O from a substantially annular plate-shaped yoke portion 21 and a position at a predetermined interval in the circumferential direction on the facing surface of the yoke portion 21 facing the rotor 11. A plurality of teeth 22,..., 22 that protrude and extend in the radial direction, and stator windings (not shown) mounted between the appropriate teeth 22, 22 are configured.

  Each 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 U +, V +, W + poles. 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.

  For example, as shown in FIG. 2, the rotor 11 includes a plurality of main magnet portions 31,..., A plurality of sub magnet portions 32,. The rotor frame 33 configured by 33A to 33C and the outer ring 50 are configured, and the main magnet portions 31 and the sub magnet portions 32 are arranged alternately in the circumferential direction in the rotor frame 33. Is housed in.

  The rotor frame 33 has a plurality of radial ribs 35,..., 35 arranged at predetermined intervals in the circumferential direction at the central portion in the direction of the rotation axis O, and the rotation axis O direction of the radial ribs 35,. The outer radial ribs 39a, 39a, 39c,..., 39c facing each other with the radial ribs 35,... 35 sandwiched between both sides, the radial ribs 35, ..., 35 and the outer radial ribs 39a,. 39a, 39c,..., 39c connected to the inner circumferential side annular shaft portion 36, the outer circumferential side annular rim portion 37, and an external drive shaft formed on the inner circumferential portion of the shaft portion 36 (for example, a vehicle A connection portion 38 connected to an input shaft or the like of the transmission.

  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 adjacent to each other in the circumferential direction are configured to have different magnetization directions as shown in FIG. The direction is set.

  Tapered chamfered portions 42 a are formed at both ends in the circumferential direction of the magnetic member 42. The magnetic member 42 may be configured by laminating a plurality of electromagnetic steel plates, or may be manufactured by molding and sintering powder such as iron powder.

  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 direction of the rotation axis O is the diameter. The thickness of the direction rib 35 is equivalent to the thickness in the direction of the rotation axis O.

  The sub-magnet portion 32 includes a pair of sub-permanent magnet pieces 43 and 43 that sandwich the radial rib 35 from both sides in the direction of the rotation axis O in the rotor frame 33, and a pair of opposite faces in the direction of the rotation axis O. As shown in FIG. 4, the sub permanent magnet pieces 43 and 43 are magnetized in a direction (substantially circumferential direction) perpendicular 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.

  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, as shown in FIG. 4, for example, with respect to the main permanent magnet piece 41 in which one side in the rotation axis O direction is N-pole and the other side is S-pole, the magnetic member 42 is arranged in the circumferential direction on one side in the rotation axis O direction. The pair of sub permanent magnet pieces 43, 43 sandwiched from both sides of the magnet are arranged so that their N poles face each other in the circumferential direction, and the magnetic member 42 is sandwiched from both sides in the circumferential direction on the other side in the rotation axis O direction. The pair of sub permanent magnet pieces 43, 43 are arranged such 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 flux lens effect due to the so-called Halbach arrangement of so-called permanent magnets, and the effective magnetic fluxes linked to the stators 12 and 12 are relatively relative to each other. It has come to increase.

  The outer ring 50 has an axial length substantially the same as the axial length of the magnetic member 42 arranged in the direction of the rotation axis O across the main permanent magnet piece 41, It is fixed by press-fitting.

  Here, in the present embodiment, for example, as shown in FIG. 5, the rotor frame 33 includes first, second, and third rotor frames 33A, 33B, and 33C that are divided into three in the direction of the rotation axis O. The second rotor frame 33B is disposed so as to be sandwiched between the first and third rotor frames 33A and 33C from both sides in the rotation axis O direction.

  The second rotor frame 33B includes an inner circumferential annular shaft portion 36b and an outer circumferential annular ring rim portion 37b connected by a plurality of radial ribs 35,. And a connecting portion 38b formed on the inner peripheral portion of the shaft portion 36b. The shaft portion 36b, the radial rib 35, the rim portion 37b, and the connecting portion 38b are all formed with the same axial length. The

  The connection portion 38b is formed with six through holes 38b1 for connecting an external drive shaft, and the first and third rotor frames sandwiching the second rotor frame 33B from both sides of the rotation axis O direction on the outer diameter side of the through hole 36b1. A frame connection through hole 38b2 for connection to 33A and 33C is formed.

  Between the adjacent radial ribs 35, 35 of the second rotor frame 33B, the main permanent magnet piece 41 constituting the main magnet portion 31 described above is disposed.

  The first and third rotor frames 33A and 33C are respectively connected to each other by a plurality of outer radial ribs 39a, ..., 39a, 39c, ..., 39c arranged at predetermined intervals in the circumferential direction. Shaft portions 36a, 36c, outer ring-shaped annular rim portions 37a, 37c, and connecting portions 38a, 38c formed on the inner peripheral portions of the shaft portions 36a, 36c, are configured in the same shape.

  The first and third rotor frames 33A, 33C are symmetrical with respect to the rotation axis O direction with the second rotor frame 33B interposed therebetween, and the outer radial ribs 39a are arranged on one side of the first rotor frame 33A in the rotation axis O direction. 39a, the connecting portion 38a is disposed on the other side in the rotational axis O direction, the connecting portion 38c is disposed on one side of the third rotor frame 33C in the rotational axis O direction, and the outer radial rib 39c is disposed on the other side in the rotational axis O direction. , 39c are arranged. Therefore, the first and third rotor frames 33A, 33C are symmetrical with respect to the second rotor frame 33B with the second rotor frame 33B interposed therebetween, and the outer radial ribs 39a, ..., 39a, 39c, ... , 39c are arranged on the outer side in the direction of the rotation axis O with the radial rib 35 as the center, and the connection portions 38a, 38c are arranged on the inner side in the direction of the rotation axis O with no gap from both sides.

  The connecting portions 38a and 38c are formed with through holes 38a1 and 38c1 for connecting an external drive shaft, and are connected to the outer diameter side of the through holes 38a1 and 38c1 with the second rotor frame 33B sandwiched from both sides in the rotational axis O direction. Frame connection through holes 38a2 and 38c2 are formed.

  The outer radial ribs 39a,..., 39a, 39c,..., 39c are extended in the circumferential direction as shown in FIGS. 6 to 8, and are arranged in the direction of the rotation axis O of the shaft portions 36a, 36c and the rim portions 37a, 37c. A rib main body 61 (second pressing portion) in which the outer end portion is connected in the radial direction, and both ends in the circumferential direction of the rib main body 61 are rotated as they move away from the center line P (see FIG. 7) of the rib main body 61 in the circumferential direction. An inclined portion 62 (first pressing portion) that is inclined substantially equal to the inclination of the chamfered portion 42a of the magnetic member 42 is provided outside the O direction. For this reason, as shown in FIG. 9, the shaft portions 36 a and 36 c and the rim portions 37 a and 37 c are shorter in the axial direction than the magnetic member 42.

  The axial length of the first and third rotor frames 33A and 33C is such that the secondary permanent magnet piece 43 can be accommodated in the space formed by the radial rib 35 and the rib body 61 as shown in FIG. 43 is substantially the same as the axial direction length of 43, and as shown in FIG. 7, the rotational axis O direction end of the inclined portion 62 that cuts outward from the rib body 61 in the rotational axis O direction is the thickness of the magnetic member 42 (axial direction). The length is set to be substantially the same.

  Between the outer radial ribs 39a, 39a, 39c, 39c adjacent to each other in the circumferential direction of the first and third rotor frames 33A, 33C, the magnetic member 42 that constitutes the main magnet portion 31 is disposed. At this time, the inclined portion 62 of the outer radial rib 39a is engaged with the chamfered portion 42a of the magnetic member 42, and the magnetic member 42 is positioned in the direction of the rotation axis O and the circumferential direction, and between the adjacent magnetic members 42, 42. Is provided with a secondary permanent magnet piece 43 constituting the secondary magnet portion 32, and the secondary permanent magnet piece 43 is a rib of radial ribs 35 and outer radial ribs 39a, ..., 39a, 39c, ..., 39c in the rotation axis O direction. It is sandwiched between the main bodies 61.

  Next, a method for manufacturing the rotor 11 of the axial gap motor 10 of the present invention will be described.

  The second rotor frame 33B has substantially fan-shaped openings for main permanent magnet pieces at equal intervals in the circumferential direction on the outer peripheral side of one annular plate member having the same thickness (length in the axial direction) as the main permanent magnet piece 41. 65 (see FIG. 5), a through hole 36b1 for connecting an external drive shaft on the inner peripheral side, and a frame connecting through hole 36b2 for connecting the first and third rotor frames 33A and 33C, for example, a press molding machine Is formed by punching.

  The first and third rotor frames 33A, 33C are formed on the outer peripheral side of an annular thin plate material having the same thickness (diameter length) as the rim portion 37b of the second rotor frame 33B, for example, using a press molding machine. , Substantially fan-shaped magnetic member openings 66 (see FIG. 5) at regular intervals in the circumferential direction, through holes 38a1 and 38c1 for connecting the external drive shaft to the inner circumferential side, and for connecting the second rotor frame 33B The through-holes 38a2, 38c2 are punched out, and then the inner peripheral side annular shaft portions 36a, 36c connected by the outer radial ribs 39a, ..., 39a, 39c, ..., 39c between the magnetic member openings 66, 66. , Outer ring-shaped annular rim portions 37a, 37c, connecting portions 38a, 38c on inner peripheral portions of the shaft portions 36a, 36c, outer radial ribs 39a, ..., 39a, 39c, ..., 39c and connecting portions 38a. , 8c and it is to be positioned in the width direction of the opposite side, bending is formed by machining.

  Further, the outer radial ribs 39a,..., 39a, 39c,..., 39c are disposed at both ends in the circumferential direction of the rib body 61 in the width direction as they are separated from the center line P of the rib body 61 (see FIG. 7) The inclined portion 62 inclined to the side opposite to the connecting portions 38a and 38c is bent at the same time as the bending process.

  Then, the main permanent magnet piece 41 is mounted in the main permanent magnet piece opening 65 of the second rotor frame 33B, and the magnetic member 42 is attached to the outer radial ribs in the magnetic member openings 66 of the first and third rotor frames 33A, 33C. 39a,..., 39c,..., 39c are mounted so that the inclined portions 62 are engaged with the chamfered portion 42a of the magnetic member 42, and the sub permanent magnet piece 43 is mounted between the adjacent magnetic members 42, 42.

  The first to third rotor frames 33A to 33C configured as described above are sandwiched by the second rotor frame 33B, and the first and third rotor frames 33A and 33C are formed of outer radial ribs 39a, ..., 39a, 39c, .., 39c are arranged so that the connecting portions 38a and 38c are located on the inner side in the rotational axis O direction, and the frame connecting through holes 38a2 to 38c2 formed in the connecting portions 38a to 38c are shown in FIG. As shown in FIG. 6, the rotor 11 is manufactured by fastening with bolts 68 and nuts 69 from both sides in the direction of the rotation axis O and fitting the outer ring 50 to the rim portion 37.

According to the axial gap type motor 10 of the present invention thus configured, the rotor frame 33 is divided into three parts, and the second rotor frame 33B is sandwiched from both sides by the first and third rotor frames 33A and 33C so as to be integrated. Since it comprises, each 1st-3rd rotor frame 33A-33C can be manufactured easily. The manufacturing method is not limited, but the first to third rotor frames 33A, 33B, and 33C can be manufactured at the same time as long as the cutting process is performed, so that the manufacturing efficiency can be improved. Further, by dividing the conventional rotor frame into three parts, the length of each rotor frame in the axial direction is shortened. As a result, the plate material is punched out in the second rotor frame, and the plate material is used in the first and third rotor frames. It can be manufactured easily by punching and bending, and the manufacturing efficiency of the rotor frame can be improved.
Further, the number of through-holes 38a1, 38b1, and 38c1 for connecting the external drive shaft can be increased and the bolt can be fastened to be firmly fixed to the external drive shaft. Further, the first and third rotors are adjusted by adjusting the positions of the through-holes 38a1 and 38c1 for connecting the external drive shaft and the through-holes 38a2 and 38c2 for connecting the external drive shaft formed in the first and third rotor frames 33A and 33C. The frames 33A and 33C can have the same shape, and an increase in the number of parts can be minimized.

Further, according to the axial gap type motor 10 of the present invention, the first and third rotor frames 33A, 33C are arranged at predetermined intervals in the circumferential direction and have a plurality of outer radial ribs 39a,. 39c, since the rib main body 61 of the outer radial ribs 39a, ..., 39a, 39c, ..., 39c is arranged on the outer side in the rotation axis O direction with respect to the auxiliary permanent magnet piece 43, The secondary permanent magnet piece 43 is sandwiched between the radial rib 35 and the outer radial ribs 39a and 39c, and the secondary permanent magnet piece 43 can be prevented from jumping outward in the rotation axis O direction.
Further, the positions of the secondary permanent magnet pieces 43, ..., 43 and the outer radial ribs 39a, ..., 39a, 39c, ..., 39c correspond to each other. , 39a, 39c,..., 39c, the auxiliary permanent magnet piece 43 is fixed in advance to improve workability during assembly.

  Furthermore, according to the axial gap type motor 10 of the present invention, since the tapered chamfered portion 42a is formed at the circumferential end of the magnetic member 42, the polar arc can be selected by selecting the inclination of the chamfered portion 42a. By adjusting the angle, it is possible to suppress an abrupt change in magnetic resistance between the stators 12 and 12 and suppress the occurrence of torque ripple.

Further, according to the axial gap type motor 10 of the present invention, the outer radial ribs 39a, ..., 39a, 39c, ..., 39c are disposed at both ends in the circumferential direction of the rib body 61 as the distance from the center line P of the rib body 61 increases. Since the inclined portion 62 inclined substantially equal to the inclination of the chamfered portion 42a of the magnetic member 42 is formed on the outer side in the rotation axis O direction, the chamfered portion 42a of the magnetic member 42 is engaged with the inclined portion 62, whereby the magnetic member 42 can be prevented from being displaced in the direction of the rotation axis O. In particular, when the magnetic member 42 is composed of a laminated steel plate in which electromagnetic steel plates are laminated in the radial direction, the adhesive force of the magnetic member 42 bonded and fixed to the rotor frame 33 is reduced due to a temperature increase or aging deterioration of the rotor 11. In addition, it is possible to regulate the positional deviation on the bonding surface between the laminated steel sheets and the positional deviation of the magnetic member 42 with respect to the rotor frame 33 due to the magnetic attractive force generated between the rotor 11 and the stator 12.
In addition, inclined portions 62 are provided at both ends in the circumferential direction of the rib main body 61 of the outer radial ribs 39a, ..., 39a, 39c, ..., 39c, and the lengths of the shaft portion 36 and the rim portion 37 in the direction of the rotation axis O are the rotation axes. By making the length of the magnetic members 42 and 42 facing each other across the main permanent magnet piece 41 in the O direction shorter than the length in the rotation axis direction, the weight of the rotor frame 33 that rotates at high speed can be reduced.

  Furthermore, according to the axial gap type motor 10 of the present invention, since the outer peripheral ring 50 is provided on the outer peripheral side in the radial direction of the rotor frame 33, the rigidity of the rotor frame 33 can be enhanced without reducing the manufacturing efficiency of the rotor frame 33. . Thereby, at the time of high speed rotation of the rotor 11, it can suppress that the rim | limb part 37 of the rotor frame 33 spreads outside by a centrifugal force. Since the outer ring 50 is made of a nonmagnetic material, it is possible to prevent the magnetic flux from being short-circuited through the outer ring 50. As a result, it is possible to prevent the torque generated by the motor 10 from decreasing and the efficiency from decreasing.

  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.

  Moreover, in the said embodiment, you may provide a stator only in the one side of the rotating shaft O direction. In this case, the secondary permanent magnet piece may be provided only on one side in the direction of the rotation axis O, and only the magnetic member may be provided on the other side as a back yoke. In this case, the magnetic member and the sub permanent magnet piece can be held on one side, for example, the first rotor frame, and the magnetic member can be held on the other side, for example, the third rotor frame as a back yoke. .

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, or a space may be provided. By setting it as a nonmagnetic member or space, the short circuit of the magnetic flux between the main permanent magnet pieces 41 and 41 in the rotor 11 can be suppressed. In addition, when making the submagnet part 32 into space, it is not necessary to provide the rib main body 61 necessarily.
Further, non-magnetic members made of resin may be provided in advance on the inner side in the direction of the rotation axis O of the rib main body 61 of the outer radial ribs 39a, ..., 39a, 39c, ..., 39c. In this embodiment, twelve sub-permanent magnet pieces 43,..., 43 are attached to the first and third rotor frames 33A, 33C, respectively, but the sub-permanent magnet piece 43 is compared to the main permanent magnet piece 41. Therefore, by attaching a resinous nonmagnetic member in advance by injection molding or the like, it is possible to improve the assembly without requiring a fine positioning operation. Note that the nonmagnetic member is not limited to welding by resin, and may be attached by adhesion or the like. Therefore, the sub permanent magnet piece 43 and the nonmagnetic member can be bonded in advance.

1 is an overall perspective view of an embodiment of an axial gap motor according to the present invention. It is a disassembled perspective view of the axial gap type motor shown in FIG. It is a disassembled perspective view of the rotor of the axial gap type motor shown in FIG. FIG. 2 is a partially exploded perspective view of a magnet piece and a magnetic member constituting a rotor of the axial gap type motor shown in FIG. 1. It is a disassembled perspective view of the rotor frame of the rotor shown in FIG. It is a front view of the rotor of the axial gap type motor shown in FIG. It is the VII-VII sectional view taken on the line of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is the IX-IX sectional view taken on the line of FIG. 2 is an exploded perspective view of an 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 31 Main magnet part 32 Sub magnet part 33 Rotor frame 33A 1st rotor frame 33B 2nd rotor frame 33C 3rd rotor frame 35 Radial direction rib (rib)
36 Shaft portion 37 Rim portion 39a, 39c Outside radial rib (outside rib)
41 Main permanent magnet piece (main magnet piece)
42 Magnetic member 43 Secondary permanent magnet piece (Sub magnet piece)
50 Outer ring 61 Rib body (second holding part)
62 Inclined part (first pressing part)
O Rotating shaft

Claims (8)

A rotor rotatable around a rotation axis;
An axial gap type motor comprising: a stator disposed opposite to the rotor from at least one side in a rotation axis direction;
The rotor is
A rotor frame having a plurality of ribs arranged in the circumferential direction at predetermined intervals and extending in the radial direction, and a shaft portion and a rim portion respectively provided on an inner diameter side and an outer diameter side of the plurality of ribs;
A plurality of main magnet pieces magnetized in the rotation axis direction and respectively disposed between the ribs adjacent in the circumferential direction;
A plurality of sub-magnet pieces magnetized in a direction perpendicular to the rotation axis direction and the radial direction and disposed on at least one side of the rib in the rotation axis direction;
A plurality of magnetic members respectively disposed between the sub magnet pieces adjacent in the circumferential direction,
The rotor frame is
Consisting of first, second and third rotor frames,
The second rotor frame holds the main magnet pieces respectively disposed between the ribs;
The first and third rotor frames are arranged so as to hold at least one of the magnetic member and the sub magnet piece and sandwich the second rotor frame from both sides in the rotation axis direction.
An axial gap type motor characterized by that. A rotor rotatable around a rotation axis;
An axial gap type motor comprising: a stator disposed opposite to the rotor from at least one side in a rotation axis direction;
The rotor is
A rotor frame having a plurality of ribs arranged in the circumferential direction at predetermined intervals and extending in the radial direction, and a shaft portion and a rim portion respectively provided on an inner diameter side and an outer diameter side of the plurality of ribs;
A plurality of magnet pieces magnetized in the rotation axis direction and respectively disposed between the ribs adjacent in the circumferential direction;
A plurality of non-magnetic members magnetized in a direction perpendicular to the rotation axis direction and the radial direction and disposed on at least one side of the rib in the rotation axis direction;
A plurality of magnetic members respectively disposed between the non-magnetic members adjacent in the circumferential direction,
The rotor frame is
Consisting of first, second and third rotor frames,
The second rotor frame holds the magnet pieces respectively disposed between the ribs;
The first and third rotor frames are arranged so as to hold at least one of the magnetic member and the nonmagnetic member and sandwich the second rotor frame from both sides in the rotation axis direction.
An axial gap type motor characterized by that. At least one of the first and third rotor frames includes a plurality of outer ribs that are arranged at predetermined intervals in the circumferential direction and extend in the radial direction,
The outer rib has a first pressing portion that presses the magnetic member.
The axial gap type motor according to claim 1, wherein the axial gap type motor is provided. The outer rib has a second pressing portion for pressing the sub-magnet piece or the nonmagnetic member.
The axial gap type motor according to claim 3. An outer ring is provided on the outer periphery of the rim portion,
The axial gap type motor according to any one of claims 1 to 4, wherein the motor is an axial gap type motor. The second rotor frame is manufactured by punching a plate material.
An axial gap type motor according to any one of claims 1 to 5, wherein: The first and third rotor frames were manufactured by punching and bending a plate material,
The axial gap type motor according to any one of claims 1 to 6, wherein At least one of the first and third rotor frames includes a plurality of outer ribs that are arranged at predetermined intervals in the circumferential direction and extend in the radial direction,
The outer rib has a first pressing portion for pressing the magnetic member and a second pressing portion for pressing the non-magnetic member,
The nonmagnetic member is attached in advance to the inner side in the rotation axis direction of the second pressing portion of the outer rib,
The axial gap type motor according to claim 2, wherein:

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