JP2010284034A - Permanent magnet rotating electric machine - Google Patents

Abstract

A permanent magnet rotating electric machine that efficiently cools the inside of a rotating electric machine is provided.
In a rotating electrical machine including a stator having armature windings and a rotor having permanent magnets supported rotatably with respect to the stator and arranged in a Halbach array, the rotor is arranged from the center of a rotating shaft. Two permanent magnet rows arranged in a Halbach array in the circumferential direction are provided, and the armature winding of the stator is provided between the permanent magnet rows, and the permanent magnet row is a magnetic pole of an outer permanent magnet of the permanent magnet row The direction of the magnetic pole of the inner permanent magnet of the permanent magnet row is the same as the direction of the magnetic pole in the radial direction, the direction of the magnetic pole in the circumferential direction is the opposite direction, and is the same as the radial direction of the rotor. The above-described rotor-side convex portions are provided, and one or more stator-side convex portions that are alternately opposed to the rotor-side convex portions are provided.
[Selection] Figure 1

Description

  The present invention relates to a permanent magnet rotating electric machine having permanent magnets arranged in a Halbach array on a rotor rotatably supported by a stator having an electronic winding.

  A permanent magnet rotating electrical machine in which permanent magnets are arranged in Halbach is a main magnetic pole magnet in which N poles and S poles are alternately arranged in the radial direction, and magnetized in a direction other than the radial direction (for example, in the circumferential direction) The auxiliary magnet is provided (see, for example, Patent Documents 1 and 2). The main magnetic pole magnet and the auxiliary magnet of the permanent magnet rotating electrical machine in which the permanent magnets are arranged in the Halbach array are substantially cylindrical as a whole. When the permanent magnets are arranged in the Halbach array, the magnetic force in a specific direction can be increased. The rotating electrical machine having the permanent magnets arranged in the Halbach arrangement can achieve high output without increasing the size.

  FIG. 14 is a magnetic flux density distribution diagram showing a magnetic flux density distribution of a rotating electrical machine having permanent magnet arrays arranged in a conventional Halbach array. The armature winding 4 is wound around the yoke core 15, and a magnetic flux is formed between the permanent magnet 16, the armature winding 4, and the yoke core 15.

JP 2006-320109 A (FIG. 1) JP 2004-350427 A (FIGS. 1 and 2)

  However, in the thing of patent document 1, since the iron core is used for a stator or a rotor, the mass of a rotary electric machine becomes heavy, and in order to aim at high output, it is necessary to lengthen in the axial direction or radial direction of a rotary electric machine. . Also, in Patent Document 2, since the iron core is used for the stator, the mass of the rotating electrical machine becomes heavy, and in order to achieve high output, it is necessary to lengthen it in the axial direction or the radial direction of the rotating electrical machine. Further, in the rotating electric machine having such a permanent magnet array arranged in Halbach, it is necessary to cool the armature winding.

  For example, in an open type rotating electrical machine, a cooling fan is attached to a rotating shaft. When the rotary electric machine is in operation, a cooling system that uses the suction force of a cooling fan to ventilate the rotary electric machine is used in the open type rotary electric machine. However, in the above cooling method, the inside and outside of the rotating electrical machine continue in space, and dust and iron powder enter the rotating electrical machine. Therefore, regular maintenance such as disassembly and cleaning of the rotating electrical machine is necessary. Therefore, in recent years, a sealed type that seals the inside of the rotating electrical machine and prevents dust and iron powder from entering the rotating electrical machine has been developed. In a hermetic rotary electric machine, the internal cooling method becomes a problem.

  An object of the present invention is to provide a permanent magnet rotating electric machine that efficiently cools the inside of the rotating electric machine.

  In a rotating electrical machine comprising a stator having armature windings and a rotor having a permanent magnet that is rotatably supported with respect to the stator and arranged in a Halbach array, the rotor is Halbach in the circumferential direction from the center of the rotating shaft. Two permanent magnet rows arranged are provided, and the armature winding of the stator is provided between the permanent magnet rows, and the permanent magnet row includes a direction of a magnetic pole of an outer permanent magnet of the permanent magnet row and the The direction of the magnetic poles of the inner permanent magnets in the permanent magnet row is the same as the direction of the magnetic poles in the radial direction, the opposite direction of the magnetic pole direction in the circumferential direction, and one or more rotors in the radial direction of the rotor Side convex portions are provided, and one or more stator side convex portions that alternately face the rotor side convex portions are provided.

  ADVANTAGE OF THE INVENTION According to this invention, the permanent magnet rotary electric machine which cools the inside of a rotary electric machine efficiently can be provided.

1 is an axial sectional view of a permanent magnet rotating electric machine according to a first embodiment of the present invention. The perspective view of the stator which concerns on the 1st Embodiment of this invention. The radial direction sectional view of the permanent magnet rotating electrical machine concerning a 1st embodiment of the present invention. The magnetic flux density distribution figure which shows an example of the magnetic flux density distribution of the permanent magnet rotary electric machine which concerns on the 1st Embodiment of this invention. The magnetic force line distribution figure which shows an example of the magnetic force line distribution of the permanent magnet rotary electric machine which concerns on the 1st Embodiment of this invention. The axial direction sectional view showing the modification of permanent magnet rotating electrical machine 1 concerning a 1st embodiment of the present invention. The axial direction sectional view of permanent magnet rotating electrical machine 1 concerning a 2nd embodiment of the present invention. The axial direction sectional view of permanent magnet rotating electrical machine 1 concerning a 3rd embodiment of the present invention. The axial direction sectional view which shows the modification of the permanent magnet rotary electric machine 1 which concerns on the 3rd Embodiment of this invention. The top view which looked at the permanent magnet rotary electric machine 1 which concerns on the 4th Embodiment of this invention in the axial direction. Sectional drawing of the axial direction of the permanent magnet rotary electric machine 1 which concerns on the 4th Embodiment of this invention. Sectional drawing of the axial direction of the permanent magnet rotary electric machine which concerns on the 5th Embodiment of this invention. The axial direction sectional view of the permanent magnet rotary electric machine concerning a 6th embodiment of the present invention. The magnetic flux density distribution figure which showed the magnetic flux density distribution of the permanent magnet rotary electric machine which has the permanent magnet row | line | column which carried out the conventional Halbach arrangement | sequence.

  FIG. 1 is an axial sectional view of a permanent magnet rotating electrical machine 1 according to a first embodiment of the present invention. In the permanent magnet rotating electrical machine 1, an armature winding 4 and a shaft 7 are formed on a stator 6, and a permanent magnet array (outside) 2, a permanent magnet array (inside) 3 and a bearing 14 are formed on a rotor 5. Composed.

  Here, FIG. 2 is a perspective view of the stator 6 provided with the armature winding 4 and the shaft 7. A shaft 7 is formed at the center of the stator 6. For example, when three-phase alternating current is used, the armature winding 4 is wound in the order of U phase-V phase-W phase. The armature winding 4 is formed of concentrated winding. The armature winding 4 is formed by a coil 42 in which a winding is wound around a bobbin 41. The armature winding 4 is composed of a plurality of bobbins 41 in the circumferential direction around a shaft 7 that is a rotating shaft.

  A bearing 14 is configured between the stator 6 and the rotor 5, and the rotor 5 is configured to rotate on the stator 6. The rotor 5 is provided with two substantially cylindrical permanent magnet rows (outer side) 2 and permanent magnet row (inner side) 3 that are formed in a Halbach array in the circumferential direction. The rotor 5 has two rows of a convex part (outer side) 51 and a convex part (inner side) 52 on the side facing the stator 6, and the convex part (outer side) 51 outside the rotor 5 includes The permanent magnet 16 of the permanent magnet row (outer side) 2 is attached to the convex portion (inner side) 52 on the inner side of the rotor 5, and the permanent magnet 16 of the permanent magnet row (inner side) 3 is attached by, for example, bonding. The armature winding 4 is arranged between a permanent magnet row (outside) 2 and a permanent magnet row (inside) 3 attached to the rotor 5.

  Further, the outer edge of the stator 6 is provided with a convex portion (outer side) 61 having a rectangular cross section. The convex portion (outside) 61 has a height that is, for example, the same position as the tip of the armature winding 4 in the axial direction. The convex portion (outer side) 61 is provided in the stator 6 so that the cross section provided in the rotor 5 is positioned on the outer side in the radial direction from the rectangular convex portion (outer side) 51.

  The convex portion (inner side) 61 provided on the stator 6 and the convex portion (outer side) 51 provided on the rotor 5 are provided at a predetermined interval in the radial direction. Further, the rotor 5 has a flat portion 53 extending outward in the radial direction from the convex portion to which the permanent magnet 16 of the permanent magnet row (outside) 2 is attached. Therefore, the rotor 5 faces the convex portion (outer side) 61 provided on the stator 6 in the axial direction. Convex part (outer side) 51 and convex part (inner side) 52 provided on the rotor 5 that faces the stator 6 in the axial direction, and convex part provided on the stator 6 that faces the rotor 5 in the axial direction. The parts (outside) 61 are provided at predetermined intervals in the axial direction.

  FIG. 3 is a radial sectional view of the permanent magnet rotating electric machine according to the first embodiment of the present invention. The permanent magnet row (outer side) 2 and the permanent magnet row (inner side) 3 attached to the rotor 5 are arranged as shown in FIG. That is, the magnetic poles magnetized in the radial direction are configured such that the magnetic poles of the permanent magnet row (outer side) 2 and the permanent magnets of the permanent magnet row (inner side) 3 are in the same direction. Regarding the permanent magnets magnetized in the circumferential direction between the magnetic poles magnetized in the radial direction, the magnetic poles of the permanent magnet row (outer side) 2 and the magnetic poles of the permanent magnet row (inner side) 3 are in opposite directions. Configure.

  Next, FIG. 4 is a magnetic flux density distribution diagram showing an example of the magnetic flux density distribution of the permanent magnet rotating electrical machine 1 according to the first embodiment of the present invention, and FIG. 5 is a permanent magnet rotation according to the first embodiment of the present invention. 4 is a magnetic force line distribution diagram illustrating an example of a magnetic force line distribution of the electric machine 1. FIG.

  As shown in FIG. 4, it can be seen that the magnetic fluxes of the permanent magnet row (outer side) 2 and the permanent magnet row (inner side) 3 are linked to the armature winding 4. The rotor 5 is rotated by passing, for example, a three-phase alternating current through the armature winding 4. As can be seen from FIGS. 4 and 5, it can be seen that a large amount of magnetic flux is generated in the permanent magnets magnetized in the radial direction. That is, a large torque can be obtained by interlinking with the armature winding 4. The magnetic fluxes of the permanent magnets magnetized in the circumferential direction are opposite in the permanent magnet row (outer side) 2 and the permanent magnet row (inner side) 3 and function to cancel each other's magnetic flux. When comparing the magnetic flux density distribution in the radial direction with FIG. 14 of the conventional example, it can be seen that the magnetic flux density distribution of FIG. 4 can obtain approximately twice as much magnetic flux as the magnetic flux density distribution of FIG. Further, FIG. 14 shows the result of winding the armature winding 4 around the yoke core 15, which causes an increase in mass.

  As described above, the rotor 5 is provided with two substantially cylindrical permanent magnet rows (outside) 2 and permanent magnet rows (inner side) 3 arranged in a Halbach array. The substantially cylindrical permanent magnet row (outside) 2 and permanent magnets are provided. By providing the armature winding 4 of the stator 6 between the rows (inside) 3, the axial width of the permanent magnet rotating electrical machine 1 can be reduced. Further, by forming two substantially cylindrical permanent magnet rows arranged in a Halbach array, the magnetic flux density is higher than in the conventional example, so that it is possible to increase the output without increasing the shape of the permanent magnet rotating electrical machine 1. .

  Here, in 1st Embodiment shown in FIG. 1, the convex part (outside) 51 and the plane part 53 and the stator 6 are convex on the outer peripheral side of the rotor 5 and the stator 6 in the radial direction. By providing the portion (outer side) 61, a labyrinth seal which is a non-contact seal is formed.

  Here, the radial interval w between the convex portion (inner side) 61 provided on the stator 6 and the convex portion (outer side) 51 provided on the rotor 5, the stator 6 and the convex portion (outer side) 51. The distance h in the axial direction between the rotor 5 and the convex portion (outer side) 61 will be described. The smaller the intervals w and h are, the smaller the seals do not come into contact with each other.

  Therefore, when the radius of the stator 6 is less than 50 mm, the radial interval w is 0.1 mm or more and less than 0.3 mm, and the axial interval h is 1.0 mm or more and less than 2.0 mm. When the radius of the stator 6 is 50 mm or more and less than 120 mm, the radial interval w is 0.3 mm or more and less than 0.8 mm, and the axial interval h is 2.0 mm or more and less than 3.0 mm. When the radius of the stator 6 is 120 mm or more and less than 300 mm, the radial interval w is 0.8 mm or more and less than 1.2 mm, and the axial interval h is 3.0 mm or more and less than 5.0 mm.

  During operation of the permanent magnet rotating electrical machine 1, heat is generated because three-phase alternating current flows through the armature winding 4. Further, the interior of the permanent magnet rotating electrical machine 1 communicates with the outside air through a gap on the outermost peripheral side in the radial direction of the permanent magnet rotating electrical machine 1 formed by the rotor 5 and the stator 6. Therefore, according to the permanent magnet rotating electrical machine 1 of the first embodiment, during operation of the permanent magnet rotating electrical machine 1, dust and iron powder do not enter the permanent magnet rotating electrical machine 1 by the labyrinth seal.

  In the permanent magnet rotating electrical machine 1, the surface area is increased by the concavo-convex structure formed by providing the rotor 5 with the convex portion (outside) 51 and the flat portion 53 and the stator 6 with the convex portion (outside) 61. . Therefore, the concavo-convex structure increases the heat absorption action of the heat generated in the armature winding 4 in the permanent magnet rotating electric machine 1 and the heat radiation action of the absorbed heat to the outside, so that the armature winding 4 is efficiently cooled. can do. Further, since the armature winding 4 is a heat generation source in the permanent magnet rotating electric machine 1, heat radiation by heat conduction is effective if an uneven structure is provided on the outermost peripheral side of the permanent magnet rotating electric machine 1 that comes into contact with the outside air.

  In the first embodiment, the labyrinth seal is formed by a one-step concavo-convex structure including a convex portion (outer side) 51 provided on the rotor 5 and a convex portion (outer side) 61 provided on the stator 6. The case of forming was described. Not limited to this, the rotor 5 is provided with a plurality of convex portions (outside) 51, and the stator 6 has a plurality of steps so as to be staggered without contacting the convex portions (outside) 51 in the radial direction. By providing the convex portion (outer side) 61 and forming a multi-step concavo-convex structure, a more effective labyrinth seal can be obtained.

  FIG. 6 is an axial cross-sectional view showing a modification of the permanent magnet rotating electrical machine 1 according to the first embodiment. The convex part (outer side) 51 provided in the rotor 5 has a substantially triangular cross section. The convex portion (outer side) 51 is provided with the permanent magnets 16 of the permanent magnet row (outer side) 2 with an inclination that approaches the rotation axis of the shaft 7 from the outer surface of the rotor 5 toward the inside of the permanent magnet rotating electrical machine 1. A surface opposite to the opposite side is formed.

  The convex part (outer side) 61 of the stator 6 is provided on the rotor 5 with the same inclination as the inclination of the surface of the convex part (outer side) 51 of the rotor 6 on the side facing the convex part (outer side) 61. A surface on the side facing the convex portion (outer side) 51 is formed. Further, the top of the convex portion (outer side) 61 is a flat surface along the radial direction so as to face the flat portion 53 of the rotor 5.

  The convex portion (outer side) 61 provided on the stator 6 and the convex portion (outer side) 51 provided on the rotor 5 are provided with their opposing surfaces spaced apart from each other by a predetermined distance. Further, a convex portion (outer side) 51 and a convex portion (inner side) 52 provided on the rotor 5 that faces the stator 6 in the axial direction, and a stator 6 that faces the rotor 5 in the axial direction. The convex portions (outside) 61 are provided at predetermined intervals in the axial direction. Therefore, the convex part (outer side) 51 and the plane part 53 are provided on the rotor 5, and the convex part (outer side) 61 is provided on the stator 6, thereby forming a labyrinth seal that is a non-contact seal.

  Here, the interval w ′ between the opposing surfaces of the convex portion (inner side) 61 provided on the stator 6 and the convex portion (outer side) 51 provided on the rotor 5 is the interval shown in FIG. 1 described above. Same as w. Further, the interval h ′ in the axial direction between the stator 6 and the convex portion (outer side) 51 and between the rotor 5 and the convex portion (outer side) 61 is the same as h described above with reference to FIG.

  According to the modification of the first embodiment shown in FIG. 6, as in the first embodiment shown in FIG. 1, when the permanent magnet rotating electrical machine 1 is in operation, dust and iron powder are removed from the permanent magnet by the rabbling seal. There is no intrusion into the rotating electrical machine 1. Moreover, the uneven structure increases heat absorption and heat dissipation of heat generated in the armature winding 4. Further, since the outermost peripheral side of the rotor 5 and the stator 6 is a labyrinth seal having a structure inclined in the axial direction, it is fixedly supported to the permanent magnet 16 in which centrifugal force is generated when the permanent magnet rotating electrical machine 1 is operated. Strength increases.

  Here, the convex part (outer side) 51 provided in the rotor 5 has a substantially triangular cross section, but the top of the convex part (outer side) 51 that faces the stator 6 in the axial direction is arranged in the radial direction. It is good also as a substantially trapezoid shape made into a plane along. Further, the rotor 5 is provided with a plurality of convex portions (outside) 51, and the stator 6 has a plurality of convex portions (outside) 51 so as to be staggered in the radial direction. ) The multi-level uneven structure provided with 61 can provide a more effective labyrinth seal.

  FIG. 7 is an axial sectional view of a permanent magnet rotating electrical machine 1 according to the second embodiment of the present invention. In FIG. 6, fins 62 are provided so as to extend in a radial direction from convex portions (outside) 61 provided on the stator 6 of the permanent magnet rotating electrical machine 1 shown in FIG. 1. By providing the stator 62 with the fins 62 that are in direct contact with the outside air, it is possible to enhance the heat radiation effect of the heat generated in the armature winding 4. The number of the fins 62 is variable depending on the size and application of the permanent magnet rotating electrical machine 1.

  FIG. 8 is an axial sectional view of a permanent magnet rotating electrical machine 1 according to the third embodiment of the present invention. The stator 6 is provided with a convex portion (inner side) 63 having a rectangular cross section. The convex portion (inner side) 63 has a height that is, for example, the same position as the tip of the armature winding 4 in the axial direction. The convex portion (inner side) 63 is provided in the stator 6 so that the cross section provided in the rotor 5 is located on the inner side in the radial direction from the rectangular convex portion (inner side) 52.

  The convex portion (inner side) 63 provided on the stator 6 and the convex portion (inner side) 52 provided on the rotor 5 are provided at a predetermined interval in the radial direction. A convex portion (inner side) 52 provided on the rotor 5 facing the stator 6 in the axial direction, and a convex portion (inner side) 63 provided on the stator 6 facing the rotor 5 in the axial direction, respectively. They are provided at predetermined intervals in the axial direction. Therefore, by providing the rotor 5 with the convex portion (inner side) 52 and the stator 6 with the convex portion (inner side) 63, a labyrinth seal that is a non-contact seal is formed.

  According to the second embodiment shown in FIG. 8, as in the first embodiment shown in FIG. 1, when the permanent magnet rotating electrical machine 1 is in operation, the bearing 14 provided on the rotor 5 by the labyrinth seal and Dust and iron powder do not enter the permanent magnet rotating electrical machine 1 from between the shafts 7 provided on the stator 6.

  Here, the radial interval w ″ between the convex portion (inner side) 61 provided on the stator 6 and the convex portion (outer side) 51 provided on the rotor 5 is the interval w shown in FIG. 1 described above. Further, the axial distance h ″ between the stator 6 and the convex portion (outer side) 51 and between the rotor 5 and the convex portion (outer side) 61 is the same as h described above with reference to FIG.

  FIG. 9 is an axial sectional view showing a modification of the permanent magnet rotating electrical machine 1 according to the third embodiment of the present invention. The rotor 5 is provided with a plurality of fins 54, which are convex portions, on the inner side in the radial direction of the convex portion (inner side) 52 along the axial direction. The stator 6 is provided with a plurality of convex (inner) fins 62 that are heat absorption fins. The plurality of fins 54 and the plurality of convex (inner) fins 62 are arranged so as to be alternated without contacting in the radial direction. Therefore, it is possible to obtain a more effective labyrinth seal by forming a multi-step uneven structure including the plurality of fins 54 and the plurality of convex (inner) fins 62.

  FIG. 10 is a plan view of the permanent magnet rotating electrical machine 1 according to the fourth embodiment of the present invention viewed in the axial direction. FIG. 11 is an axial cross-sectional view of a permanent magnet rotating electrical machine 1 according to the fourth embodiment of the present invention. The rotor 5 is provided with a substantially fan-shaped opening 55 having a maximum length from the boundary between the rotor 5 and the shaft 7 to the inner surface of the convex portion 52 along the radial direction. Further, the stator 6 is provided with an opening 64 having the same shape and the same size as the opening 55 provided in the rotor 5 at a position corresponding to the axial direction.

  The permanent magnet rotating electrical machine 1 in which the rotor 5 and the stator 6 are hermetically sealed by the labyrinth seal is provided with the opening 55 in the rotor 5 and the opening 64 in the stator 6. It can be cooled with outside air from the 16th side. Besides the present embodiment, the number, size, and shape of the openings 55 and the openings 64 provided in the circumferential direction are not limited thereto. Moreover, even if the positions along the axial direction of the opening 55 of the rotor 5 and the opening 64 of the stator 6 do not correspond to each other, the same effect can be obtained.

  FIG. 12 is an axial sectional view of a permanent magnet rotating electrical machine 1 according to the fifth embodiment of the present invention. A plurality of groove portions 65 are provided along the circumferential direction on the surface of the stator 6 opposite to the surface facing the rotor 5. The groove 65 forms irregularities on the stator 6 and increases the surface area. The stator 6 provided with the groove 65 increases the heat radiation action of the heat generated in the armature winding 4 in the permanent magnet rotating electric machine 1 to the outside, so that the armature winding 4 can be efficiently cooled. .

  The groove 65 is provided at a position corresponding to the armature winding 4 provided in the stator 5 along the axial direction. The location, number, and direction of the groove 65 provided in the stator 5 are not limited. Since the armature winding 4 is a heat generation source, it is effective to provide the stator 5 at a position close to the armature winding 4.

  FIG. 13 is an axial cross-sectional view of a permanent magnet rotating electrical machine 1 according to the sixth embodiment of the present invention. The rotor is provided with a fan 56 at a position facing the stator 6 and corresponding to the armature winding 4 along the axial direction. The fan 56 cools the armature winding 4 by directly blowing air to the armature winding 4.

  Further, the air that has cooled the armature winding 4 exits to the outside through a gap on the outer peripheral side in the radial direction of the permanent magnet rotating electrical machine 1 formed by the rotor 5 and the stator 6. Therefore, even when the permanent magnet rotating electrical machine 1 is in operation, the wind flow by the fan 56 is from the inside of the permanent magnet rotating electrical machine 1 to the outside, so that dust and iron powder can enter the rotating electrical machine. Absent.

  It is effective to combine the first to sixth embodiments as appropriate.

DESCRIPTION OF SYMBOLS 1 ... Permanent magnet rotary electric machine, 2 ... Permanent magnet row | line | column (outside), 3 ... Permanent magnet row | line | column (inner side), 4 ... Armature winding, 5 ... Rotor, 6 ... Stator, 7 ... Shaft, 14 ... Bearing, DESCRIPTION OF SYMBOLS 16 ... Permanent magnet, 41 ... Bobbin, 42 ... Coil, 51 ... Convex part (outside), 52 ... Convex part (inside), 53 ... Plane part, 54 ... Fin, 55 ... Opening part, 56 ... Fan, 61 ... convex part (outside), 62 ... convex part (inside) fin, 63 ... convex part (inside), 64 ... opening, 65 ... groove part.

Claims (7)

In a rotating electrical machine comprising a stator having armature windings and a rotor having permanent magnets that are rotatably supported with respect to the stator and arranged in Halbach,
The rotor is provided with two rows of permanent magnet rows in which the rotor is arranged in the circumferential direction from the center of the rotating shaft, the armature winding of the stator is provided between the permanent magnet rows, and the permanent magnet row is The direction of the magnetic poles of the outer permanent magnets in the permanent magnet row and the direction of the magnetic poles of the inner permanent magnets in the permanent magnet row are the same for the radial magnetic poles, and the opposite directions for the circumferential magnetic poles. ,
One or more rotor side convex parts are provided in the radial direction of the rotor, and one or more stator side convex parts alternately opposed to the rotor side convex parts are provided. Electric.   2. The permanent magnet according to claim 1, wherein the stator has the stator-side convex portion on a radially outer side than the rotor-side convex portion on the outermost peripheral side provided in the rotor. Magnet rotating electric machine.   The permanent magnet rotating electrical machine according to claim 2, wherein a radiating fin is provided on the outermost convex portion on the stator side in the radial direction provided on the stator.   The rotor-side convex portion has a surface having an inclination with respect to the rotation axis, and the stator-side convex portion has an opposite surface having the same inclination as the inclination of the rotor-side convex portion. The permanent magnet rotating electric machine according to claim 1, comprising:   The rotor is provided with the rotor-side convex portion radially inside the inner permanent magnet, and the stator has a diameter larger than the rotor-side convex portion closest to the radial direction of the inner permanent magnet. The permanent magnet rotating electric machine according to claim 1, wherein the stator side convex portion is provided inside the direction.   When the radius of the stator is less than 50 mm, the rotor-side convex portion and the stator-side convex portion have an interval between opposing surfaces of 0.1 mm or more and less than 0.3 mm, and the rotor-side convex portion When the axial distance between the tip of the stator and the stator and the tip of the convex part on the stator side and the rotor is 1.0 mm or more and less than 2.0 mm, and the radius of the stator is 50 mm or more and less than 120 mm, they face each other The distance between the surfaces is 0.3 mm or more and less than 0.8 mm, and the axial distance between the tip of the rotor-side convex portion and the stator and the tip of the stator-side convex portion and the rotor is 2.0 mm or more. When the stator has a radius of less than 3.0 mm and the radius of the stator is not less than 120 mm and less than 300 mm, the distance between the facing surfaces is not less than 0.8 mm and less than 1.2 mm, the tip of the convex part on the rotor side, the stator and the stator The axial interval between the tip of the side convex portion and the rotor is 3.0 mm or more and less than 5.0 mm. Permanent magnet rotating electric machine according to claim 1, wherein the door.   Each of the rotor and the stator has an opening portion between the rotor-side convex portion or the stator-side convex portion provided on the radially innermost side and the rotation shaft. The permanent magnet rotating electric machine according to claim 5.

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