JP4896690B2 - Axial gap type motor - Google Patents

Description

  The present invention relates to an axial gap type motor.

2. Description of the Related Art Conventionally, for example, a pair of stators arranged opposite to each other so as to sandwich a rotor from both sides in the rotation axis direction is provided, and a magnetic flux loop via a pair of stators is formed with respect to a field magnetic flux generated by a permanent magnet of the rotor. A shaft gap type permanent magnet synchronous machine is known (see, for example, Patent Document 1 and Patent Document 2).
JP-A-10-271784 JP 2001-136721 A

By the way, in the permanent magnet synchronous machine according to the above prior art, in a permanent magnet synchronous machine including a rotor in which permanent magnets and magnetic bodies magnetized only in the same direction of the rotation axis direction are alternately arranged in the circumferential direction, for example, As compared with a permanent magnet synchronous machine having a rotor in which permanent magnets whose magnetization directions are reversed are alternately arranged in the circumferential direction, there arises a problem that the magnet torque is halved and the reluctance torque cannot be used effectively. .
In a permanent magnet synchronous machine including a rotor in which permanent magnets whose magnetization directions are reversed are alternately arranged in the circumferential direction and a magnetic body is arranged between the permanent magnets adjacent in the circumferential direction, the phase of the magnet torque Since the phase of the reluctance torque is different, there arises a problem that the magnet torque and the reluctance torque cannot be used effectively.
In addition, since the permanent magnet of the rotor only faces the stator via the air gap, there is a possibility that permeance is lowered and demagnetization is likely to occur. For example, if the demagnetization resistance of the permanent magnet is increased with respect to such a problem, the magnetic flux density may be lowered, and it becomes difficult to improve the output and efficiency of the permanent magnet synchronous machine.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an axial gap type motor capable of efficiently increasing the output by effectively using a permanent magnet and a magnetic body provided in a rotor. .

To achieve the object according to solve the above problems, the axial gap motor of the first aspect of the present invention, the rotor (e.g. comprising a permanent magnet pieces (e.g., permanent magnet piece 41 in the embodiment) , And a pair of stators (for example, the stators 12 and 12 in the embodiment) disposed so as to face each other so as to sandwich the rotor from both sides in the rotation axis direction. The rotor is a magnetic material member (for example, the magnetic material member 42 in the embodiment) disposed on each surface on one side and the other side in the rotation axis direction of the permanent magnet piece. And a spacer (for example, the radial rib 34 in the embodiment) provided between the permanent magnet pieces adjacent in the circumferential direction, or a spacer made of a nonmagnetic material, Te Pas-shaped or arc-shaped chamfered shape (e.g., chamfered shape 42c in the embodiment) provided in the circumferential end portion and penetrating section including through-hole or a slit penetrating in the axial direction parallel to the direction ( for example, the through holes 42a in the embodiment, the inner circumferential side slits 42b1, the outer circumferential side slit 42b2), it is characterized in Rukoto provided in the vicinity of the circumferential ends.

Furthermore, in the axial gap type motor according to the second aspect of the present invention, the rotor is a magnetic material pole portion arranged alternately with the permanent magnet pieces in the circumferential direction (for example, the magnetic material pole portion 32 in the embodiment). ).

Furthermore, in the axial gap type motor according to the third aspect of the present invention, the pole portion of the magnetic material has a pole portion penetrating portion penetrating in a direction parallel to the rotation axis direction (for example, the pole portion penetrating in the embodiment). The hole 45, the outer peripheral side slit 45a, and the inner peripheral side slit 45b) are provided.

According to the axial gap type motor of the first aspect of the present invention, by providing a member made of a magnetic material on the surface of the permanent magnet piece, it is possible to prevent a decrease in permeance of the permanent magnet piece and to demagnetize the permanent magnet piece. While being able to suppress, reluctance torque can be increased.
Moreover, the occurrence of torque ripple can be suppressed by making the circumferential end of the magnetic material member into a tapered or arcuate chamfered shape.

Furthermore , a magnetic path that penetrates the magnetic material member can be formed between the pair of stators by providing the through portion in the vicinity of the circumferential end of the magnetic material member. As a result, a desired magnetic direction can be imparted to the current magnetic flux generated by the stator windings of each stator, the outputable torque can be increased, and the magnetic resistance between the pair of stators can be increased rapidly. The current flux waveform shaping by the stator winding of a pair of stators can be performed in such a way as to suppress the change, and the generation of harmonics of the torque ripple and current flux waveform can be suppressed, thereby reducing iron loss. Can do.

Furthermore, according to the axial gap type motor of the invention described in claim 2 , the reluctance torque due to the pole portion of the magnetic material is effectively utilized while suppressing an increase in the amount of permanent magnets required for the configuration of the rotor. The output can be increased efficiently.
Furthermore, according to the axial gap type motor of the invention described in claim 3 , by providing the pole portion of the magnetic material with the pole portion penetration portion, the magnetic path penetrating the pole portion of the magnetic material between the pair of stators is provided. Can be formed. As a result, a desired magnetic direction can be imparted to the current magnetic flux generated by the stator windings of each stator, the outputable torque can be increased, and the magnetic resistance between the pair of stators can be increased rapidly. The current flux waveform shaping by the stator winding of a pair of stators can be performed in such a way as to suppress the change, and the generation of harmonics of the torque ripple and current flux waveform can be suppressed, thereby reducing iron loss. Can do.

Hereinafter, a first embodiment of an axial gap type motor of the present invention will be described with reference to the accompanying drawings.
The axial gap type motor 10 according to the present embodiment includes, for example, as shown in FIGS. 1 to 3, a substantially annular rotor 11 that is rotatably provided around the rotation axis O of the axial gap type motor 10, 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.

  For example, as shown in FIG. 1, each stator 12 has a substantially annular plate-shaped yoke portion 21 and a rotational axis O from a position spaced apart on the opposing surface of the yoke portion 21 facing the rotor 11 in the circumferential direction. .., 22 that protrudes toward the rotor 11 along the direction and extends in the radial direction, and a stator winding (not shown) that is mounted between the appropriate teeth 22, 22. ing.

Each stator 12 is a 6N type having, for example, 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 the V ⁺ and W ⁺ poles in the direction of the rotation axis O.
For example, with respect to a pair of stators 12 and 12 facing in the direction of the rotation axis O, three stators 12 corresponding to one of U ⁺ , V ⁺ , W ⁺ poles and one of U ⁻ , V ⁻ , W ⁻ poles are provided. The teeth 22, 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 other of the U ⁻ , V ⁻ , W ⁻ poles rotate. It is set so as to face each other in the direction of the axis O, and is set so that the energized state with respect to 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 reversed in electrical angle. ing.

  For example, as shown in FIG. 2, the rotor 11 includes a plurality of magnet pole portions 31,..., 31 and a rotor frame 33 made of a non-magnetic material that accommodates the magnet pole portions 31,. Has been.

The rotor frame 33 includes an inner peripheral side cylindrical portion 35, an outer peripheral side cylindrical portion 36, and an inner peripheral side cylinder connected by a plurality of radial ribs 34,. And a connecting portion 37 that is formed in an annular plate shape protruding inward from the inner peripheral surface of the shaped portion 35 and connected to an external drive shaft (for example, an input shaft of a vehicle transmission). Has been.
The plurality of magnet pole portions 31 accommodated in the rotor frame 33 are sandwiched by the inner peripheral cylindrical portion 35 and the outer peripheral cylindrical portion 36 from both sides in the radial direction, and via the radial ribs 34. It arrange | positions so that it may adjoin in the circumferential direction.

The magnet pole portion 31 has a substantially fan-shaped plate-like permanent magnet piece 41 magnetized in the thickness direction (that is, a direction parallel to the rotation axis O direction), and 1 sandwiches the permanent magnet piece 41 from both sides in the thickness direction. The permanent magnet pieces 41, 41 of the magnet pole portions 31,..., 31 adjacent to each other in the circumferential direction are configured to have different magnetization directions. It is set to become.
That is, in the magnet pole portion 31 including the permanent magnet piece 41 whose one side in the direction parallel to the rotation axis O direction is N pole, the permanent magnet whose one side in the direction parallel to the rotation axis O direction is S pole. The magnet pole part 31 which comprises the piece 41 is adjacent to the circumferential direction.

The pair of magnetic material members 42 and 42 covering the one surface in the thickness direction of the permanent magnet piece 41 and the other surface are substantially fan-shaped in cross section in the thickness direction. Yes.
Further, a plurality of through holes 42 a,..., 42 a that penetrates in the direction parallel to the rotation axis O direction are provided in the vicinity of the circumferential end of the magnetic member 42 of the magnet pole portion 31. Each through-hole 42a is, for example, a long hole whose cross-sectional shape with respect to the rotation axis O direction has a radial direction as a longitudinal direction, and the plurality of through-holes 42a,..., 42a are arranged at predetermined intervals in the circumferential direction. .
And the permanent magnet piece 41 of each magnet pole part 31 accommodated in the rotor frame 33 is pinched | interposed from the both sides of the circumferential direction by a pair of radial ribs 34 and 34 adjacent in the circumferential direction.

  As described above, according to the axial gap type motor 10 according to the first embodiment, the magnetic material members 42 and 42 that sandwich the magnetic poles of the permanent magnet piece 41 in the magnet pole portion 31 are provided. A decrease in permeance can be prevented, demagnetization of the permanent magnet piece 41 can be suppressed, and a reluctance torque can be increased.

  In addition, by providing the through hole 42 a in the vicinity of the circumferential end of the magnetic material member 42, a magnetic path that penetrates the magnetic material member 42 can be formed between the pair of stators 12 and 12. Thereby, desired magnetic directionality can be given to the current magnetic flux by the stator windings of the respective stators 12 and 12, the torque that can be output can be increased, and between the pair of stators 12 and 12. The current magnetic flux waveform shaping by the stator windings of the pair of stators 12 and 12 can be performed so as to suppress a sudden change in the magnetic resistance of the motor, and torque ripples and harmonics of the current magnetic flux waveform can be generated. It can suppress and iron loss can be reduced.

  In the above-described embodiment, the radial rib 34 is disposed between the magnet pole portions 31 and 31 that are adjacent in the circumferential direction in the rotor frame 33. However, the present invention is not limited to this. An air gap may be provided instead of 34.

  In the above-described embodiment, the rotor 11 includes a plurality of magnet pole portions 31,..., 31 and a rotor frame 33 made of a nonmagnetic material that accommodates the magnet pole portions 31,. However, the present invention is not limited to this. For example, as in the first modification shown in FIGS. 4 to 6, the rotor 11 includes a plurality of magnet pole portions 31,..., 31 and a plurality of magnetic material pole portions 32. , 32 and a rotor frame 33 made of a non-magnetic material. The magnet pole portions 31 and the magnetic material pole portions 32 are accommodated in the rotor frame 33 in a state of being alternately arranged in the circumferential direction. May be.

In this first modified example, the magnet pole portion 31 and the magnetic material pole portion 32 housed in the rotor frame 33 are sandwiched between the inner peripheral cylindrical portion 35 and the outer peripheral cylindrical portion 36 from both sides in the radial direction. In addition, they are arranged adjacent to each other in the circumferential direction via the radial ribs 34.
The magnetic material pole portion 32 includes a plurality of pole portion through holes 45,..., 45 penetrating in a direction parallel to the rotation axis O direction, and each of the pole portion through holes 45 has, for example, a cross-sectional shape with respect to the rotation axis O direction. Is a long hole having the radial direction as the longitudinal direction, and the plurality of pole portion through holes 45,..., 45 are arranged at predetermined intervals in the circumferential direction.

  In the first modification, the permanent magnet pieces 41,..., 41 of the plurality of magnet pole portions 31,..., 31 accommodated in the rotor frame 33 are set so that the magnetization directions are the same. May be.

  According to the axial gap type motor 10 according to the first modified example, the magnetic material pole portions 32 alternately arranged with the magnet pole portions 31 in the circumferential direction are provided with the pole portion through holes 45, whereby the pair of stators 12. , 12 can form a magnetic path penetrating the magnetic material pole portion 32. As a result, a desired magnetic directionality can be imparted to the current magnetic flux generated by the stator winding of each stator 12 more appropriately, the torque that can be output can be increased, and the pair of stators 12 can be increased. , 12 can suppress the rapid change in the magnetic resistance between the stator windings of the pair of stators 12, 12, and the current magnetic flux waveform shaping can be performed. Generation of waves can be suppressed and iron loss can be reduced.

  Further, when the permanent magnet piece 41 of the magnet pole portion 31 has only one N pole opposed to one of the pair of stators 12 and 12, and only the S pole opposed to the other, In the energization of each stator winding, the optimum energization phase for the magnet torque by the magnet pole portion 31 and the optimum energization phase for the reluctance torque by the magnetic material pole portion 32 coincide with each other, and the magnet torque and the reluctance torque are reduced. It is possible to effectively increase the output efficiently.

  In the first embodiment described above, the magnetic material member 42 of the magnet pole portion 31 is provided with a through hole 42a. In the first modification of the first embodiment described above, the magnetic material pole portion 32 is provided. However, the present invention is not limited to this. For example, as in the second modification shown in FIG. 7, the magnetic member 42 is parallel to the direction of the rotation axis O instead of the through hole 42a. May be provided with inner side slits 42b1 or outer side slits 42b2 penetrating in any direction, and the magnetic material pole portion 32 is a plurality of penetrating in a direction parallel to the rotation axis O direction instead of the pole portion through hole 45. The outer peripheral slit 45a or a plurality of inner peripheral slits 45b may be provided.

Here, each inner peripheral side slit 42b1 is formed, for example, so as to cut away from a concave groove provided on the inner peripheral surface of the magnetic member 42 (for example, radially outward from the inner peripheral surface of the magnetic member 42). The depth direction of each concave groove is radially outward of the magnetic material member 42, and each concave groove extends in a direction parallel to the rotation axis O direction.
Further, each outer peripheral slit 42b2 is, for example, a concave groove provided on the outer peripheral surface of the magnetic material member 42 (for example, a concave groove formed so as to be cut radially inward from the outer peripheral surface of the magnetic material member 42) ), The depth direction of each concave groove is the inside in the radial direction of the magnetic member 42, and each concave groove extends in a direction parallel to the rotation axis O direction.
Further, each outer peripheral slit 45a is, for example, a concave groove provided on the outer peripheral surface of the magnetic material pole portion 32 (for example, a recess formed so as to be cut radially inward from the outer peripheral surface of the magnetic material pole portion 32) The depth direction of each concave groove is the radially inner side of the magnetic material pole portion 32, and each concave groove extends in a direction parallel to the rotation axis O direction.
Each inner circumferential slit 45b is formed, for example, as a concave groove provided on the inner circumferential surface of the magnetic material pole portion 32 (for example, shaving radially outward from the inner circumferential surface of the magnetic material pole portion 32). Etc.), the depth direction of each concave groove is radially outward of the magnetic material pole portion 32, and each concave groove extends in a direction parallel to the rotation axis O direction.

Hereinafter, a second embodiment of the axial gap type motor of the present invention will be described with reference to the accompanying drawings.
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.

  For example, as shown in FIG. 8, each stator 12 has a rotation axis O from a position at a predetermined interval in the circumferential direction on the opposing surface of the substantially annular plate-shaped yoke portion 21 and the yoke portion 21 facing the rotor 11. .., 22 that protrudes toward the rotor 11 along the direction and extends in the radial direction, and a stator winding (not shown) that is mounted between the appropriate teeth 22, 22. ing.

Each stator 12 is a 6N type having, for example, 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 the V ⁺ and W ⁺ poles in the direction of the rotation axis O.
For example, with respect to a pair of stators 12 and 12 facing in the direction of the rotation axis O, three stators 12 corresponding to one of U ⁺ , V ⁺ , W ⁺ poles and one of U ⁻ , V ⁻ , W ⁻ poles are provided. The teeth 22, 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 other of the U ⁻ , V ⁻ , W ⁻ poles rotate. It is set so as to face each other in the direction of the axis O, and is set so that the energized state with respect to 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 reversed in electrical angle. ing.

  For example, as shown in FIG. 9, the rotor 11 includes a plurality of magnet pole portions 31,..., 31 and a rotor frame 33 made of a non-magnetic material that accommodates the magnet pole portions 31,. Has been.

The rotor frame 33 includes an inner peripheral side cylindrical portion 35, an outer peripheral side cylindrical portion 36, and an inner peripheral side cylinder connected by a plurality of radial ribs 34,. And a connecting portion 37 that is formed in an annular plate shape protruding inward from the inner peripheral surface of the shaped portion 35 and connected to an external drive shaft (for example, an input shaft of a vehicle transmission). Has been.
The plurality of magnet pole portions 31 accommodated in the rotor frame 33 are sandwiched by the inner peripheral cylindrical portion 35 and the outer peripheral cylindrical portion 36 from both sides in the radial direction, and via the radial ribs 34. It arrange | positions so that it may adjoin in the circumferential direction.

The magnet pole portion 31 has a substantially fan-shaped plate-like permanent magnet piece 41 magnetized in the thickness direction (that is, a direction parallel to the rotation axis O direction), and 1 sandwiches the permanent magnet piece 41 from both sides in the thickness direction. The permanent magnet pieces 41, 41 of the magnet pole portions 31,..., 31 adjacent to each other in the circumferential direction are configured to have different magnetization directions. It is set to become.
That is, in the magnet pole portion 31 including the permanent magnet piece 41 whose one side in the direction parallel to the rotation axis O direction is N pole, the permanent magnet whose one side in the direction parallel to the rotation axis O direction is S pole. The magnet pole part 31 which comprises the piece 41 is adjacent to the circumferential direction.

The pair of magnetic material members 42 and 42 covering the one surface in the thickness direction and the other surface of the permanent magnet piece 41 have a substantially sector shape in which the cross-sectional shape in the thickness direction is substantially the same as that of the permanent magnet piece 41. ing.
Further, a tapered or arcuate chamfered shape 42 c is formed at the circumferential end of the magnetic material member 42 of the magnet pole portion 31.
And the permanent magnet piece 41 of each magnet pole part 31 accommodated in the rotor frame 33 is pinched | interposed from the both sides of the circumferential direction by a pair of radial ribs 34 and 34 adjacent in the circumferential direction.

As described above, according to the axial gap type motor 10 according to the second embodiment, the magnetic material members 42 and 42 sandwiching the magnetic poles of the permanent magnet piece 41 in the magnet pole portion 31 are provided. A decrease in permeance can be prevented, demagnetization of the permanent magnet piece 41 can be suppressed, and a reluctance torque can be increased.
In addition, a taper-shaped or arc-shaped chamfered shape 42 c is formed at the circumferential end of the magnetic material member 42, thereby suppressing a rapid change in magnetic resistance between the pair of stators 12, 12. The generation of torque ripple can be suppressed.

  In the above-described embodiment, the radial rib 34 is disposed between the magnet pole portions 31 and 31 that are adjacent in the circumferential direction in the rotor frame 33. However, the present invention is not limited to this. An air gap may be provided instead of 34.

In the above-described embodiment, the vicinity of the circumferential end of the magnetic member 42 of the magnet pole portion 31 penetrates in a direction parallel to the rotation axis O direction as in the first modification shown in FIG. , 42a may be provided. Each through-hole 42a is, for example, a long hole whose cross-sectional shape with respect to the rotation axis O direction has a radial direction as a longitudinal direction, and the plurality of through-holes 42a,..., 42a are arranged at predetermined intervals in the circumferential direction. .
According to the first modification, the magnetic material member 42 is provided with a through hole 42a in the vicinity of the circumferential end thereof, thereby forming a magnetic path that penetrates the magnetic material member 42 between the pair of stators 12 and 12. Can do. Thereby, desired magnetic directionality can be given to the current magnetic flux by the stator windings of the respective stators 12 and 12, the torque that can be output can be increased, and between the pair of stators 12 and 12. The current magnetic flux waveform shaping by the stator windings of the pair of stators 12 and 12 can be performed so as to suppress a sudden change in the magnetic resistance of the motor, and torque ripples and harmonics of the current magnetic flux waveform can be generated. It can suppress and iron loss can be reduced.

  In the above-described embodiment, the rotor 11 includes a plurality of magnet pole portions 31,..., 31 and a rotor frame 33 made of a nonmagnetic material that accommodates the magnet pole portions 31,. However, the present invention is not limited to this. For example, as in the second modification shown in FIG. 11, the rotor 11 includes a plurality of magnet pole portions 31,..., 31 and a plurality of magnetic material pole portions 32,. The magnetic pole portion 31 and the magnetic pole portion 32 may be accommodated in the rotor frame 33 in a state of being alternately arranged in the circumferential direction. .

In this second modification, the magnet pole portion 31 and the magnetic material pole portion 32 housed in the rotor frame 33 are sandwiched between the inner peripheral side cylindrical portion 35 and the outer peripheral side cylindrical portion 36 from both sides in the radial direction. In addition, they are arranged adjacent to each other in the circumferential direction via the radial ribs 34.
The magnetic material pole portion 32 includes a plurality of pole portion through holes 45,..., 45 penetrating in a direction parallel to the rotation axis O direction, and each of the pole portion through holes 45 has, for example, a cross-sectional shape with respect to the rotation axis O direction. Is a long hole having the radial direction as the longitudinal direction, and the plurality of pole portion through holes 45,..., 45 are arranged at predetermined intervals in the circumferential direction.
A tapered or arcuate chamfered shape 47 is formed at the circumferential end of the magnetic material pole portion 32.

  In this second modification, the permanent magnet pieces 41,..., 41 of the plurality of magnet pole portions 31,..., 31 accommodated in the rotor frame 33 are set so that the magnetization directions are the same. May be.

  According to the axial gap type motor 10 according to the second modified example, the magnetic material pole portions 32 alternately arranged with the magnet pole portions 31 in the circumferential direction are provided with the pole portion through holes 45, thereby making a pair of stators 12. , 12 can form a magnetic path penetrating the magnetic material pole portion 32. As a result, a desired magnetic directionality can be imparted to the current magnetic flux generated by the stator winding of each stator 12 more appropriately, the torque that can be output can be increased, and the pair of stators 12 can be increased. , 12 can suppress the rapid change in the magnetic resistance between the stator windings of the pair of stators 12, 12, and the current magnetic flux waveform shaping can be performed. Generation of waves can be suppressed and iron loss can be reduced.

  Further, when the permanent magnet piece 41 of the magnet pole portion 31 has only one N pole opposed to one of the pair of stators 12 and 12, and only the S pole opposed to the other, In the energization of each stator winding, the optimum energization phase for the magnet torque by the magnet pole portion 31 and the optimum energization phase for the reluctance torque by the magnetic material pole portion 32 coincide with each other, and the magnet torque and the reluctance torque are reduced. It is possible to effectively increase the output efficiently.

  In the first modification of the second embodiment described above, the magnetic material member 42 of the magnet pole portion 31 is provided with a through hole 42a, and in the second modification of the third embodiment described above, Although the magnetic material electrode portion 32 is provided with the electrode through hole 45, the present invention is not limited to this. For example, as in the third modification shown in FIG. 12, the magnetic material member 42 is rotated instead of the through hole 42a. The inner circumferential side slit 42b1 or the outer circumferential side slit 42b2 that penetrates in a direction parallel to the axis O direction may be provided, and the magnetic material pole portion 32 is parallel to the rotation axis O direction instead of the pole portion through hole 45. A plurality of outer peripheral slits 45a or a plurality of inner peripheral slits 45b penetrating in the direction may be provided.

Here, each inner peripheral side slit 42b1 is formed, for example, so as to cut away from a concave groove provided on the inner peripheral surface of the magnetic member 42 (for example, radially outward from the inner peripheral surface of the magnetic member 42). The depth direction of each concave groove is radially outward of the magnetic material member 42, and each concave groove extends in a direction parallel to the rotation axis O direction.
Further, each outer peripheral slit 42b2 is, for example, a concave groove provided on the outer peripheral surface of the magnetic material member 42 (for example, a concave groove formed so as to be cut radially inward from the outer peripheral surface of the magnetic material member 42) ), The depth direction of each concave groove is the inside in the radial direction of the magnetic member 42, and each concave groove extends in a direction parallel to the rotation axis O direction.
Further, each outer peripheral slit 45a is, for example, a concave groove provided on the outer peripheral surface of the magnetic material pole portion 32 (for example, a recess formed so as to be cut radially inward from the outer peripheral surface of the magnetic material pole portion 32) The depth direction of each concave groove is the radially inner side of the magnetic material pole portion 32, and each concave groove extends in a direction parallel to the rotation axis O direction.
Each inner circumferential slit 45b is formed, for example, as a concave groove provided on the inner circumferential surface of the magnetic material pole portion 32 (for example, shaving radially outward from the inner circumferential surface of the magnetic material pole portion 32). Etc.), the depth direction of each concave groove is radially outward of the magnetic material pole portion 32, and each concave groove extends in a direction parallel to the rotation axis O direction.

1 is a perspective view of an axial gap type motor according to a first embodiment of the present invention. 1 is an exploded perspective view of a rotor of an axial gap type motor according to a first embodiment of the present invention. 1 is a plan view of a rotor of an axial gap type motor according to a first embodiment of the present invention. It is a perspective view of the axial gap type motor which concerns on the 1st modification of the 1st Embodiment of this invention. It is a disassembled perspective view of the rotor of the axial gap type motor which concerns on the 1st modification of the 1st Embodiment of this invention. It is a top view of the rotor of the axial gap type motor which concerns on the 1st modification of the 1st Embodiment of this invention. It is a disassembled perspective view of the rotor of the axial gap type motor which concerns on the 2nd modification of the 1st Embodiment of this invention. It is a perspective view of an axial gap type motor concerning a 2nd embodiment of the present invention. It is a disassembled perspective view of the rotor of the axial gap type motor which concerns on the 2nd Embodiment of this invention. It is a disassembled perspective view of the rotor of the axial gap type motor which concerns on the 1st modification of the 2nd Embodiment of this invention. It is a disassembled perspective view of the rotor of the axial gap type motor which concerns on the 2nd modification of the 2nd Embodiment of this invention. It is a disassembled perspective view of the rotor of the axial gap type motor which concerns on the 3rd modification of the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Axial gap type motor 11 Rotor 12 Stator 32 Magnetic material pole part (magnetic material pole part)
41 Permanent magnet piece 42 Magnetic material member (member of magnetic material)
42a Through hole (through part)
42b1 Inner peripheral side slit (penetrating part)
42b2 Outer peripheral side slit (penetrating part)
42c Chamfered shape 45 Pole through hole (Pole through part)
45a Peripheral slit (pole penetration)
45b Inner circumference side slit (pole penetration)

Claims (3)

An axial gap type motor comprising a rotor having a permanent magnet piece and a pair of stators arranged to face each other so as to sandwich the rotor from both sides in the rotation axis direction,
The rotor is a gap provided between the members of the magnetic material disposed on the surfaces of the permanent magnet pieces on one side and the other side in the rotation axis direction and the permanent magnet pieces adjacent in the circumferential direction. Or a spacer made of a non-magnetic material,
The member of the magnetic material has a tapered or arc-shaped chamfered shape at the circumferential end , and a through-hole or slit that penetrates in a direction parallel to the rotation axis direction is provided at the circumferential end. axial gap motor according to claim Rukoto provided on parts near. The axial gap motor according to claim 1, wherein the rotor includes pole portions of a magnetic material arranged alternately with the permanent magnet pieces in a circumferential direction. The axial gap type motor according to claim 2 , wherein the pole portion of the magnetic material includes a pole portion penetrating portion penetrating in a direction parallel to the rotation axis direction.

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