JP2010093928A - Axial gap type motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axial gap type motor capable of preventing short circuit of a magnetic flux between magnet pieces adjacent to each other in a circumferential direction. <P>SOLUTION: The axial gap type motor 10 includes: a plurality of main permanent magnet pieces 41 magnetized in a rotating shaft O direction and disposed in the circumferential direction; a rotor 11 rotatable around the rotating shaft; and stators 12 oppositely disposed on the rotor 11 from both ends of the rotating shaft O direction. A rotor core 13 is configured by winding a tape-like magnetic plate 14 and provided with a space 16 for preventing magnetic flux leakage between the main permanent magnet pieces 41, 41 adjacent in the circumferential direction. <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, Patent Document 1).

  As shown in FIG. 12, in the axial gap type motor 100 described in Patent Document 1, the rotor core 101 winds the tape-shaped electromagnetic steel plate 102, and the wound rotor core 101 has an opening 104 around which the magnet piece 103 is stored. It is formed by providing at equal intervals in the direction.

JP 2006-166635 A

  In the axial gap type motor 100 described in Patent Document 1, since the magnet pieces 103 and 103 adjacent in the circumferential direction are formed by the electromagnetic steel plate 102, the magnets 103 and 103 adjacent in the circumferential direction in the rotor core 101 are formed. As a result, the magnetic flux is short-circuited, so that it was not possible to prevent a reduction in torque generated by the motor 100 and a reduction in efficiency.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an axial gap motor that can suppress a short circuit of magnetic flux between magnet pieces adjacent in the circumferential direction.

In order to achieve the above object, the invention described in claim 1
A plurality of main magnet pieces (a main permanent magnet piece 41 in an embodiment described later) magnetized in the rotation axis direction and arranged in the circumferential direction, and a plurality of main magnet piece hole portions (described later) for holding the main magnet pieces respectively. A rotor core (rotor core 13 in an embodiment described later) having a main magnet piece hole 15 in the embodiment, and 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 pair of stators (stator 12 in an embodiment to be described later) opposed to the rotor from both sides in the rotation axis direction,
The rotor core is
It is configured by winding a tape-like magnetic plate (magnetic plate 14 in an embodiment described later),
A magnetic flux leakage suppression space (magnetic flux leakage suppression space 16 in an embodiment described later) is provided between the main magnet pieces adjacent in the circumferential direction.
An axial gap type motor characterized by that.

In addition to the structure of Claim 1, the invention of Claim 2 is
Providing a partition member made of a non-magnetic material in the magnetic flux leakage suppression space;
It is characterized by that.

In addition to the structure of Claim 2, the invention of Claim 3 is
The rotor includes a shaft portion (a shaft portion 36 in an embodiment described later) and a rim portion (a rim portion 37 in an embodiment described later), the shaft portion, and the rim provided on the inner diameter side and the outer diameter side of the rotor core, respectively. A rotor frame (rotor frame 33 in an embodiment described later) having a rib (radial rib 35 in an embodiment described later) connecting the two parts,
The partition member is the rib;
It is characterized by that.

In addition to the structure in any one of Claims 1-3, the invention of Claim 4 is
The rotor includes a plurality of submagnet pieces (subpermanent magnet pieces 43 in the embodiments described later) magnetized in a direction orthogonal to the rotation axis direction and the radial direction,
The rotor core has sub-magnet holes (sub-magnet holes 17 in the embodiments described later) that hold the sub-magnet pieces on both sides in the rotation axis direction of the magnetic flux leakage suppression space.
It is characterized by that.

In addition to the structure in any one of Claims 1-4, the invention of Claim 5 is
The magnetic flux leakage suppression space has an axial length substantially equal to the axial length of the main magnet piece.
It is characterized by that.

In addition to the structure of Claim 4 or 5, the invention of Claim 6 is
The magnetic flux leakage suppression space has a circumferential length substantially equal to the circumferential length of the sub magnet piece.
It is characterized by that.

In addition to the structure of Claims 4-6, the invention of Claim 7 is
A secondary magnetic flux leakage suppression space (a secondary magnetic flux leakage suppression space 18 in an embodiment described later) is provided outside the rotational axis direction of the secondary magnet piece.
It is characterized by that.

In addition to the structure of Claim 7, the invention of Claim 8 is
Having an opening (opening 20 in an embodiment described later) at the outer end of the auxiliary magnetic flux leakage suppression space in the rotation axis direction;
It is characterized by that.

In addition to the structure of Claim 8, the invention of Claim 9 is
The opening has a protruding portion (a protruding portion 19 in an embodiment described later) extending from both sides in the circumferential direction.
The axial gap type motor according to claim 8, wherein:

In order to achieve the above object, the invention according to claim 10 provides:
A plurality of main magnet pieces (a main permanent magnet piece 41 in an embodiment described later) magnetized in the rotation axis direction and arranged in the circumferential direction, and a plurality of main magnet piece hole portions (described later) for holding the main magnet pieces respectively. And a rotor core (rotor core 13 in an embodiment described later) having a rotor core (rotor 11 in an embodiment described later) that can rotate around the rotation axis, and a rotation shaft In a rotor manufacturing method of an axial gap type motor (axial gap type motor 10 in an embodiment described later) comprising a pair of stators (stator 12 in an embodiment described later) disposed opposite to the rotor from both sides in the direction,
A main magnet piece hole forming step for forming a plurality of main magnet piece holes for holding the main magnet piece in a tape-like magnetic plate (a magnetic plate 14 in an embodiment described later);
A magnetic flux leakage suppression space forming step for forming a magnetic flux leakage suppression space (magnetic flux leakage suppression space 16 in an embodiment described later) between adjacent holes for the main magnet pieces of the magnetic plate;
A rotor core winding step of winding the magnetic plate on which the hole portion for the main magnet piece and the magnetic flux leakage suppression space are formed to form a rotor core,
It is characterized by that.

In addition to the structure of Claim 10, the invention of Claim 11 is
A secondary magnet piece (a secondary permanent magnet piece 43 in an embodiment described later) that is magnetized in a direction perpendicular to the rotational axis direction and the radial direction and is disposed on both sides of the magnetic flux leakage suppression space in the rotational axis direction. A step of forming a hole for a secondary magnet piece for forming a hole for inserting a magnetic piece (a secondary magnet hole 17 in an embodiment described later) in the magnetic plate;
A shaft portion (a shaft portion 36 in an embodiment described later) and a rim portion (a rim portion 37 in an embodiment described later) are provided on the inner diameter side and the outer diameter side of the rotor core, and the shaft portion and the A rotor core housing step of inserting a rib (radial rib 35 in the embodiment described later) connecting the rim portion,
In the magnetic flux leakage suppression space forming step, the magnetic flux leakage suppression space has at least an axial length substantially equal to an axial length of the main magnet piece hole and a circumferential length substantially equal to the circumferential length of the sub magnet piece hole. Having at least one length in the direction length,
It is characterized by that.

In addition to the structure of Claim 11, the invention of Claim 12 is
A protrusion (protrusion 19 in an embodiment described later) that holds the submagnet piece on the rotor core, and an opening provided between the protrusions, at the outer end in the rotation axis direction of the hole for the submagnet piece A sub magnetic flux leakage suppression space forming step for forming (opening 20 in an embodiment described later),
It is characterized by that.

  According to the invention of claim 1, since the rotor core includes the magnetic flux leakage suppression space between the main magnet pieces adjacent in the circumferential direction, the short circuit of the magnetic flux between the main magnet pieces adjacent in the circumferential direction is suppressed, and the motor is generated. Torque reduction and efficiency reduction can be prevented. In addition, since the rotor core is formed by winding the magnetic plate, even if the adhesive force is reduced due to the temperature rise or aging of the rotor, the axis of the magnetic plate caused by the magnetic attractive force generated between the rotor and the stator. It is possible to prevent positional displacement in the direction.

  According to the invention of claim 2, by providing the partition member made of a non-magnetic material in the magnetic flux leakage suppression space, it is possible to suppress the short circuit of the magnetic flux more than the gap. Furthermore, the rigidity of the rotor core can be improved.

  According to the invention of claim 3, by providing the rib for connecting the shaft portion and the rim portion in the magnetic flux leakage suppression space, it is possible to prevent refraction due to the deflection of the magnetic plate, and further, the rib constituting the rotor frame can prevent the magnetic flux leakage. It can be shared as a suppressing member.

  According to the invention of claim 4, the effective magnetic flux generation amount can be relatively increased by the magnetic lens effect of restricting the direction of the magnetic flux of the main magnet piece by adopting a substantially Halbach structure.

  According to the invention of claim 5, since the magnetic flux leakage suppression space has an axial length substantially equal to the axial length of the main magnet piece, the magnetic flux flow caused by the magnetic flux leakage from the main magnet pieces adjacent in the circumferential direction is prevented. While being able to suppress, the intensity | strength of a magnetic board can be maintained.

  According to the invention of claim 6, since the magnetic flux leakage suppression space has a circumferential length substantially equal to the circumferential length of the secondary magnet piece, the magnetic flux flow caused by the leakage of magnetic flux from the secondary magnet piece adjacent in the axial direction is reduced. Can be suppressed.

  According to the seventh aspect of the present invention, since the auxiliary magnetic flux leakage suppression space is provided on the outer side in the rotation axis direction of the auxiliary magnet piece, a short circuit of the magnetic flux on the outside of the auxiliary magnet piece can be suppressed.

  According to invention of Claim 8, the opening part can suppress the short circuit of the magnetic flux of the main magnet piece and submagnet piece in the rotating shaft direction outer side of a submagnet piece.

  According to the ninth aspect of the present invention, since the sub magnetic flux leakage suppression space includes the protrusions extending from both sides in the circumferential direction, the sub magnet piece can be held in the rotor core.

  According to the invention of claim 10, since the magnetic flux leakage suppression space is provided between the hole portions for main magnet pieces adjacent in the circumferential direction, when the main magnet pieces are mounted in the hole portions for main magnet pieces, they are adjacent in the circumferential direction. The short circuit of the magnetic flux between the main magnet pieces can be suppressed, and the reduction of the torque generated by the motor and the reduction in efficiency can be prevented. In addition, since the rotor core is formed by winding the magnetic plate, even if the adhesive force is reduced due to the temperature rise or aging of the rotor, the axis of the magnetic plate caused by the magnetic attractive force generated between the rotor and the stator. It is possible to prevent positional displacement in the direction.

  According to the eleventh aspect of the present invention, by providing the rib for connecting the shaft portion and the rim portion in the magnetic flux leakage suppression space, refraction due to the deflection of the magnetic plate can be prevented, and further, the rib constituting the rotor frame can prevent the magnetic flux leakage. It can be shared as a suppressing member. In addition, since the rotor is magnetized in the direction orthogonal to the rotation axis direction and the radial direction and includes a plurality of sub-magnet pieces disposed on at least one side in the rotation axis direction of the magnetic flux leakage suppression space, a substantially Halbach structure is obtained. The effective magnetic flux generation amount can be relatively increased by the magnetic lens effect that regulates the direction of the magnetic flux of the main magnet piece. Moreover, since the secondary magnetic flux leakage suppression space is provided on the outer side in the rotation axis direction of the secondary magnet piece, a short circuit of the magnetic flux on the outside of the secondary magnet piece can be suppressed. Further, the magnetic flux leakage suppression space has at least one of an axial length substantially equal to the axial length of the main magnet piece and a circumferential length substantially equal to the circumferential length of the sub magnet piece. It is possible to suppress the flow of magnetic flux due to magnetic flux leakage from adjacent main magnet pieces or the flow of magnetic flux due to magnetic flux leakage from auxiliary magnet pieces adjacent in the axial direction.

  According to the twelfth aspect of the present invention, it is possible to suppress a short circuit of the magnetic flux outside the secondary magnet piece by the opening, and it is possible to hold the secondary magnet piece in the rotor core by the protrusion.

  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 rotor core 13, a plurality of main magnet portions 31,..., 31, a plurality of sub magnet portions 32,. The rotor core 13 is accommodated in the rotor frame 33 in a state where the main magnet portions 31 and the sub magnet portions 32 are alternately arranged in the circumferential direction in the rotor core 13.

  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 rotor core 13 is formed by winding a magnetic plate 14 made of a tape-shaped electromagnetic steel plate, which will be described later, and as shown in FIG. Main permanent magnet piece holes 15 and columnar magnetic flux leakage suppression spaces 16 are alternately formed at predetermined intervals in the circumferential direction, and the secondary permanent magnets described later are provided on both sides of the magnetic flux leakage suppression space 16 in the direction of the rotation axis O. A columnar sub permanent magnet piece hole 17 for accommodating the piece 43 is formed. In other words, the rotor core 13 includes yoke portions 42,..., 42 disposed so as to sandwich the main permanent magnet pieces 41 from both sides in the rotation axis O direction at predetermined intervals in the circumferential direction, and yoke portions adjacent to the rotation axis O direction. A pair of axial connection portions 14a for connecting the portions 42 and 42 and a pair of circumferential connection portions 14b for connecting the yoke portions 42 and 42 adjacent to each other in the circumferential direction are integrally formed.

  In the main magnet portion 31, a substantially sector plate-shaped main permanent magnet piece 41 magnetized in the thickness direction (that is, the rotation axis O direction) is disposed in the main permanent magnet piece hole portion 15, and the main magnet portions 31 are adjacent to each other in the circumferential direction. As shown in FIG. 5, the main permanent magnet pieces 41 and 41 of the magnet portions 31 and 31 are set so that the magnetization directions are different from each other.

  As shown in FIG. 5, the sub-magnet portion 32 includes a pair of sub-permanent magnet pieces 43 and 43 magnetized in a direction (substantially circumferential direction) perpendicular to the rotation axis O direction and the radial direction, respectively. The pair of secondary permanent magnet pieces 43, 43 arranged in the secondary permanent magnet piece holes 17, 17 formed on both sides in the width direction and opposed in the direction of the rotation axis O have different magnetization directions. ing.

  Further, the pair of sub permanent magnet pieces 43 and 43 facing each other in the circumferential direction via the main magnet portion 31 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. 5, 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 yoke portion 42 is circumferentially arranged 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 is disposed so that the N poles thereof are opposed to each other in the circumferential direction, and the yoke portion 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. As a result, a so-called permanent halbach arrangement of permanent magnets is obtained, and 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 that regulates the direction of the magnetic flux of the main permanent magnet piece 41. The effective magnetic flux linked to the stators 12 and 12 is relatively increased.

  As shown in FIG. 4, the rotor frame 33 has a plurality of shaft-side rib mounting holes 36a, which are circular through holes in which the radial ribs 35 are mounted on the shaft portion 36, at equal intervals in the circumferential direction. A plurality of rim portion side rib mounting holes 37a, which are rectangular through holes in which the radial ribs 35 are mounted to the portion 37, are formed at equal intervals in the circumferential direction.

  Further, the radial rib 35 has a substantially T-shape, and the radially inner end portion 35a has a substantially circular cross section and is formed with a male thread portion. The radially outer end portion 35b and the radially intermediate portion The portion 35c has a rectangular cross section, and the radially outer end portion 35b gradually increases in length in the circumferential direction from the radially intermediate portion 35c toward the radially outer side, and has a uniform axial length. It is configured.

  Then, the rotor core 13 having the main permanent magnet piece 41 and the sub permanent magnet piece 43 is sandwiched between the shaft portion 36 and the rim portion 37 from the inner diameter side and the outer diameter side, and inserted through the rim portion side rib mounting hole 37a. The formed radial rib 35 is fitted into the magnetic flux leakage suppression space 16 in the radially intermediate portion 35c, the radially inner end portion 35a is mounted in the shaft portion side rib mounting hole 36a, and the inner diameter side of the shaft portion 36 The nuts 38 are screwed together, and the radial ribs 35 are fixed to the shaft portion 36.

  Next, a method for manufacturing the rotor 11 of the axial gap motor 10 of the present invention will be described. The width direction of the magnetic plate 14 is the direction of the rotation axis O of the rotor 11, and the longitudinal direction of the magnetic plate 14 is the circumferential direction of the rotor 11.

  As shown in FIG. 6, the rotor core 13 includes a main permanent magnet piece hole 15 and a magnetic flux leakage suppression space 16 at the center in the width direction of a magnetic plate 14 made of a tape-shaped electromagnetic steel plate, and the width of the magnetic flux leakage suppression space 16. Sub-permanent magnet piece hole portions 17 are formed on both sides in the direction by punching using, for example, a press molding machine (main magnet piece hole forming step, magnetic flux leakage suppression space forming step, sub magnet piece hole forming step. ).

  Here, the width of the magnetic flux leakage suppression space 16 is Ta, the length in the longitudinal direction is Tp, the length of the secondary permanent magnet piece hole 17 is Lsp, and the width of the magnetic flux leakage suppression space 16 is arranged on both sides in the width direction. When the distance between the permanent magnet piece hole portions 17 and 17 is Lsa, the width of the main permanent magnet piece hole portion 15 is Lma, and the distance between the adjacent main permanent magnet piece hole portions 15 and 15 is Lmp, Ta = Lma < It is set so as to satisfy the relationship of Lsa, Tp <Lsp <Lmp.

  The tape-like magnetic plate 14 in which the main permanent magnet piece hole 15, the magnetic flux leakage suppression space 16, and the sub permanent magnet piece hole 17 are formed in this manner is formed on the core 70 as shown in FIG. It is temporarily fixed and wound by rotating the core 70 (rotor core winding step).

  Since the magnetic plate 14 is wound on the winding core 70, the length in the longitudinal direction increases from the innermost side to the first layer, the second layer, the third layer,. Therefore, if the distance between the centers of the adjacent magnetic flux leakage suppression spaces 16 in FIG. 6 is the pitch P, the pitch P is set to gradually increase from the innermost diameter side to the first layer, the second layer, the third layer,. Has been. Further, since the main permanent magnet piece 41 has a substantially fan-shaped plate shape, the length in the longitudinal direction of the main permanent magnet piece hole 15 is gradually increased from the innermost side to the first layer, the second layer, the third layer,. It is set to be. Then, as shown in FIG. 8A, the winding start 14d and the winding end 14e of the magnetic plate 14 wound to a predetermined size finish winding at the same position in the radial direction from the center of the core 70. The rotor core 13 is formed by welding the winding start 14d and winding end 14e of the wound magnetic plate 14. In addition, you may adhere | attach each layer of the magnetic board 14 after welding. Further, the winding start 14d and winding end 14e of the magnetic plate 14 may be the circumferential connecting portion 14b instead of the yoke portion 42.

  The rotor core 13 manufactured in this manner is formed by winding a magnetic plate 14 made of a tape-shaped electromagnetic steel plate, and has a substantially fan-shaped main permanent magnet that accommodates the main permanent magnet piece 41 at the center in the direction of the rotation axis O. The hole 15 for a piece and the columnar magnetic flux leakage suppression space 16 are alternately formed in the circumferential direction, and the columnar auxiliary permanent magnet that accommodates the auxiliary permanent magnet piece 43 on both sides of the magnetic flux leakage suppression space 16 in the rotation axis O direction. A single hole 17 is formed.

  Then, the main permanent magnet piece 41 is attached to the hole 15 for the main permanent magnet piece of the rotor core 13, and the sub permanent magnet piece 43 is attached to the hole 17 for the sub permanent magnet piece.

  Subsequently, the shaft portion 36 is provided on the inner diameter side of the rotor core 13 including the main permanent magnet piece 41 and the sub permanent magnet piece 43, the rim portion 37 is provided on the outer diameter side, and the rim portion side rib mounting hole 37a of the rim portion 37 is provided. The radial ribs 35 are inserted from. At this time, the radially intermediate portion 35c of the radial rib 35 is fitted into the magnetic flux leakage suppression space 16, the radially inner end portion 35a is mounted in the shaft portion side rib mounting hole 36a, and the inner diameter side of the shaft portion 36 is Then, the radial rib 35 is fixed to the shaft portion 36 by screwing the nut 38. In this way, the rotor core 13 is accommodated in the rotor frame 33 (rotor core accommodation step), and the rotor 11 is manufactured.

  As described above, according to the axial gap type motor 10 according to the present embodiment, since the magnetic flux leakage suppression space 16 is provided between the main permanent magnet pieces 41 and 41 adjacent in the circumferential direction, the main permanent magnets adjacent in the circumferential direction. The short circuit of the magnetic flux between the pieces 41 and 41 can be suppressed, and the reduction in the torque generated by the motor 10 and the reduction in efficiency can be prevented. Further, since the rotor core 13 is formed by winding the tape-shaped magnetic plate 14, even if the adhesive force is reduced due to temperature rise or aging deterioration of the rotor 11, magnetic attraction generated between the rotor 11 and the stator 12. The displacement of the magnetic plate 14 in the direction of the rotation axis O due to the force can be prevented. Furthermore, since the main permanent magnet piece hole 15 and the magnetic flux leakage suppression space 16 can be simultaneously formed by a single punching, the manufacturing efficiency can be improved.

  Further, according to the axial gap type motor 10 according to the present embodiment, by providing the radial leakage rib 35 that connects the shaft portion 36 and the rim portion 37 in the magnetic flux leakage suppression space 16, the refraction caused by the deflection of the magnetic plate 14 is prevented. Further, it can be used as a member for suppressing magnetic flux leakage of the radial ribs 35 constituting the rotor frame 33.

  In the magnetic flux leakage suppression space 16, a gap may be formed instead of the radial rib 35, or a partition member made of a nonmagnetic material may be provided. Even if it is a gap, magnetic flux leakage can be suppressed, and by providing a partition member made of a non-magnetic material, magnetic flux leakage can be further suppressed and the rigidity of the rotor core can be improved. In this case, the shaft portion 36 and the rim portion 37 may be fixed to the rotor core 13 by press fitting or shrink fitting.

  Further, according to the axial gap type motor 10 according to the present embodiment, the rotor 11 is magnetized in the direction orthogonal to the rotation axis O direction and the radial direction, and is disposed on both sides of the magnetic flux leakage suppression space 16 in the rotation axis O direction. Since the plurality of sub permanent magnet pieces 43 are provided, a substantially Halbach structure is obtained, and the effective magnetic flux generation amount can be relatively increased by the magnetic lens effect that regulates the direction of the magnetic flux of the main permanent magnet piece 41.

  Further, according to the axial gap type motor 10 according to the present embodiment, the magnetic flux leakage suppression space 16 has an axial length that is substantially equal to the axial length of the main permanent magnet piece 41, so that it is adjacent to the main permanent magnet in the circumferential direction. The flow of magnetic flux due to magnetic flux leakage from the magnet pieces 41 and 41 can be suppressed. Moreover, even if it has the magnetic flux leakage suppression space 16, it can suppress that the magnetic plate 14 becomes insufficient in intensity | strength.

  In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

  FIG. 9 is a schematic view of the rotor core of the first modification of the axial gap type motor 10 according to the first embodiment of the present invention viewed from the circumferential direction.

  In FIG. 9, tapered chamfered portions 14c and 14c are provided at both longitudinal ends of the yoke portion 42 constituting the rotor core 13, and further set so as to satisfy the relational expressions Ta <Lsa = Lma and Tp = Lsp <Lmp. Has been. The polar arc angle is adjusted by selecting the inclination of the chamfered portion 14c, thereby suppressing a sudden change in the magnetic resistance between the stators 12 and 12, thereby suppressing the occurrence of torque ripple.

  Further, since the longitudinal length Tp of the magnetic flux leakage suppression space 16 has a length substantially equal to the longitudinal length Lsp of the sub permanent magnet piece 43, the sub permanent magnet pieces 43 and 43 adjacent to each other in the direction of the rotation axis O are used. The flow of magnetic flux due to magnetic flux leakage can be suppressed.

  The width Ta of the magnetic flux leakage suppression space 16 is set to be substantially equal to the width Lma of the main permanent magnet piece 41, and the longitudinal length Tp of the magnetic flux leakage suppression space 16 is set to the longitudinal length Lsp of the sub permanent magnet piece 43. And may be set approximately equal. Thereby, the flow of the magnetic flux by the magnetic flux leakage from the main permanent magnet pieces 41 and 41 adjacent in the circumferential direction can be suppressed, and the magnetic flux leakage from the auxiliary permanent magnet pieces 43 and 43 adjacent in the rotation axis O direction. The flow of magnetic flux due to can be suppressed.

  Furthermore, the chamfered portions 14c, 14c adjacent in the longitudinal direction are provided outside the secondary permanent magnet piece hole portion 17 with an opening 20 opened to the outside in the width direction, and the secondary permanent magnet piece hole portion 17 is provided with the secondary permanent magnet piece hole 17. When the piece 43 is mounted, the auxiliary magnetic flux leakage suppression space 18 is formed on the outer side of the auxiliary permanent magnet piece 43 in the rotation axis O direction. Thereby, the short circuit of the magnetic flux of the main permanent magnet piece 41 and the sub permanent magnet piece 43 in the rotation-axis O direction outer side of the sub permanent magnet piece 43 can be suppressed.

  FIG. 10 is a schematic view of the rotor core of the second modified example of the axial gap type motor 10 according to the first embodiment of the present invention as seen from the circumferential direction.

  In FIG. 10, projections 19, 19 extending from yoke portions 42, 42 on both sides in the longitudinal direction are further provided on the outer side in the width direction of the sub permanent magnet piece hole 17, and between the projections 19, 19. An opening 20 is formed. According to the second modification, when the secondary permanent magnet piece 43 is mounted in the secondary permanent magnet piece hole 17, the projections 19 and 19 hold the secondary permanent magnet piece 43 in the rotor frame 33, thereby It is possible to prevent the permanent magnet piece 43 from falling off in the direction of the rotation axis O. In addition, since the secondary magnetic flux leakage suppression space 18 including the opening 20 formed between the protrusions 19 and 19 is formed in the direction of the rotation axis O of the sub permanent magnet piece 43, the direction of the rotation axis O of the sub permanent magnet piece 43. Short-circuiting of magnetic flux on the outside can be suppressed.

  FIG. 11 is a schematic view of a rotor core of a third modified example of the axial gap motor 10 according to the first embodiment of the present invention as seen from the circumferential direction. In the third modification, a protrusion is further provided in the first modification described above.

  In FIG. 11, tapered chamfered portions 14 c and 14 c are provided at both longitudinal ends of the yoke portion 42 constituting the rotor core 13, and the protrusions 19 and 19 extend from the chamfered portions 14 c and 14 c to the sub permanent magnet piece hole 17. And an opening 20 is formed between the protrusions 19 and 19. According to the third modified example, in addition to the effects of the first modified example, when the sub permanent magnet piece 43 is mounted in the hole portion for the sub permanent magnet piece 17, the protrusions 19 and 19 cause the sub permanent magnet piece 43 to rotate to the rotor. By holding in the frame 33, it is possible to prevent the secondary permanent magnet piece 43 from falling off in the direction of the rotation axis O.

  Moreover, in this embodiment and the 1st-3rd modification, not only a substantially Halbach type but a nonmagnetic member may be arrange | positioned instead of the subpermanent magnet piece 43 in the submagnet part 32, and it is good also as a space.

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. FIG. 2 is a partially exploded perspective view of a rotor of the axial gap type motor shown in FIG. 1. It is a disassembled perspective view of the rotor frame of the axial gap type motor shown in FIG. It is a partial exploded perspective view of the magnet piece which comprises the rotor of the axial gap type motor shown in FIG. It is the figure which looked at the tape-shaped magnetic board which comprises a rotor core from the circumferential direction. It is explanatory drawing explaining the process of winding the tape-shaped magnetic board of FIG. (A) is the figure which looked at a part of rotor core explaining the winding start and winding end of a tape-shaped magnetic board in FIG. 7 from the front, (b) is the fragmentary perspective view of a rotor core. It is the figure which looked at the tape-shaped magnetic board which comprises the rotor core which concerns on a 1st modification from the circumferential direction. It is the figure which looked at the tape-shaped magnetic board which comprises the rotor core which concerns on a 2nd modification from the circumferential direction. It is the figure which looked at the tape-shaped magnetic board which comprises the rotor core which concerns on a 3rd modification from the circumferential direction. 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 13 Rotor core 14 Tape-like magnetic plate 15 Main permanent magnet piece hole 16 Magnetic flux leakage suppression space 17 Secondary permanent magnet piece hole 18 Sub magnetic flux leakage suppression space 19 Projection 20 Opening 33 Rotor frame 35 Radial rib 36 Shaft portion 37 Rim portion 41 Main permanent magnet piece (main magnet piece)
42 Yoke part 43 Sub permanent magnet piece (sub magnet piece)
O Rotating shaft

Claims (12)

A plurality of main magnet pieces magnetized in the direction of the rotation axis and arranged in the circumferential direction, and a rotor core having a plurality of main magnet piece holes for holding the main magnet pieces, respectively, are rotatable around the rotation axis A rotor and
A pair of stators disposed opposite to the rotor from both sides in the rotation axis direction, and an axial gap type motor comprising:
The rotor core is
Constructed by winding a tape-shaped magnetic plate,
A magnetic flux leakage suppression space is provided between the main magnet pieces adjacent in the circumferential direction.
An axial gap type motor characterized by that. Providing a partition member made of a non-magnetic material in the magnetic flux leakage suppression space;
The axial gap type motor according to claim 1. The rotor includes a rotor frame having a shaft portion and a rim portion respectively provided on an inner diameter side and an outer diameter side of the rotor core, and a rib connecting the shaft portion and the rim portion,
The partition member is the rib;
The axial gap type motor according to claim 2, wherein: The rotor includes a plurality of sub-magnet pieces magnetized in a direction perpendicular to the rotation axis direction and the radial direction,
The rotor core has a sub-magnet hole for holding the sub-magnet piece on both sides in the rotation axis direction of the magnetic flux leakage suppression space.
The axial gap type motor according to any one of claims 1 to 3, wherein The magnetic flux leakage suppression space has an axial length substantially equal to the axial length of the main magnet piece.
The axial gap type motor according to any one of claims 1 to 4, wherein the motor is an axial gap type motor. The magnetic flux leakage suppression space has a circumferential length substantially equal to the circumferential length of the sub magnet piece.
The axial gap type motor according to claim 4 or 5, wherein A secondary magnetic flux leakage suppression space is provided on the outer side in the rotation axis direction of the secondary magnet piece.
The axial gap type motor according to claim 4, wherein the axial gap type motor is provided. Having an opening at the outer axial end of the auxiliary magnetic flux leakage suppression space,
The axial gap type motor according to claim 7. The opening has protrusions extending from both sides in the circumferential direction.
The axial gap type motor according to claim 8, wherein: A plurality of main magnet pieces magnetized in the direction of the rotation axis and arranged in the circumferential direction, and a rotor core having a plurality of main magnet piece holes for holding the main magnet pieces, respectively, are rotatable around the rotation axis In a rotor manufacturing method of an axial gap type motor comprising: a rotor and a pair of stators arranged opposite to the rotor from both sides in the rotation axis direction,
A main magnet piece hole forming step for forming a plurality of main magnet piece holes for holding the main magnet pieces in the tape-like magnetic plate,
A magnetic flux leakage suppression space forming step for forming a magnetic flux leakage suppression space between adjacent holes of the main magnet piece of the magnetic plate;
A rotor core winding step of winding the magnetic plate on which the hole portion for the main magnet piece and the magnetic flux leakage suppression space are formed to form a rotor core,
The rotor manufacturing method characterized by the above-mentioned. Sub-magnet piece insertion holes that are magnetized in the direction perpendicular to the rotation axis direction and the radial direction and hold a plurality of sub-magnet pieces arranged on both sides of the magnetic flux leakage suppression space in the rotation axis direction are formed in the magnetic plate A step of forming a hole for the secondary magnet piece,
A rotor core housing step of providing a shaft portion and a rim portion on an inner diameter side and an outer diameter side of the rotor core, and inserting a rib connecting the shaft portion and the rim portion into the magnetic flux leakage suppression space,
In the magnetic flux leakage suppression space forming step, the magnetic flux leakage suppression space has at least an axial length substantially equal to an axial length of the main magnet piece hole and a circumferential length substantially equal to the circumferential length of the sub magnet piece hole. Having at least one length in the direction length,
The method of manufacturing a rotor according to claim 10. A secondary magnetic flux leakage suppression space is formed at the outer end in the rotational axis direction of the secondary magnet piece hole to form a projection that holds the secondary magnet piece on the rotor core and an opening provided between the projections. A process comprising:
The rotor manufacturing method according to claim 11.

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