JPWO2020261328A1 - Rotor of rotary electric machine and rotary electric machine - Google Patents

Abstract

Rotor To obtain a rotor of a rotating electric machine that can suppress the temperature rise of the iron core. A plurality of rotors of this rotor electric machine are provided side by side in the circumferential direction of the cylindrical rotor core cylindrical portion and the rotor core cylindrical portion, projecting from the rotor core cylindrical portion toward the stator side, and made of a magnetic material. It is provided between the main pole of the rotor and the main poles adjacent to each other in the circumferential direction of the rotor core cylindrical portion, and is provided with a plurality of auxiliary poles protruding from the rotor core cylindrical portion toward the stator side, and a plurality of auxiliary poles are provided. The poles are made of non-magnetic metal.

Description

The present invention relates to a rotor of a rotary electric machine and a rotary electric machine.

Conventionally, a rotor of a rotary electric machine having a cylindrical rotor core and a rotor core having a plurality of magnetic poles provided side by side in the circumferential direction of the rotor core cylindrical portion is known. Each of the plurality of magnetic poles protrudes toward the stator from the outer peripheral surface of the rotor core cylindrical portion. Further, each of the plurality of magnetic poles is made of a magnetic material (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-246571

However, an eddy current is generated in the rotor core. As a result, there is a problem that the temperature of the rotor core rises.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a rotor and a rotary electric machine of a rotary electric machine capable of suppressing a temperature rise of a rotor core. ..

The rotor of the rotary electric machine according to the present invention is provided side by side in the circumferential direction of the cylindrical rotor core cylindrical portion and the rotor core cylindrical portion, projects from the rotor core cylindrical portion toward the stator side, and is composed of a magnetic material. It is provided between the plurality of main poles provided and the main poles adjacent to each other in the circumferential direction, and has a compensating pole protruding from the cylindrical portion of the rotor core toward the stator. The compensating pole is composed of a non-magnetic metal. ing.

According to the rotor of the rotary electric machine according to the present invention, it is possible to suppress the temperature rise of the rotor core.

It is sectional drawing which shows the rotary electric machine which concerns on Embodiment 1 of this invention. It is a cross-sectional view taken along the line II-II of FIG. It is a perspective view which shows the rotor of the rotary electric machine which concerns on Embodiment 2 of this invention. It is a perspective view which shows the rotor of the rotary electric machine which concerns on Embodiment 3 of this invention. It is a top view which shows the main part of the rotor of the rotary electric machine which concerns on Embodiment 4 of this invention. It is a top view which shows the main part of the rotor of the rotary electric machine which concerns on Embodiment 5 of this invention. It is a top view which shows the main part of the rotor of the rotary electric machine which concerns on Embodiment 6 of this invention. It is an exploded perspective view which shows the main part of the rotor of the rotary electric machine which concerns on Embodiment 7 of this invention. It is a perspective view which shows the state which the main part of the rotor of FIG. 8 is assembled. It is a top view which shows the main part of the rotor of the rotary electric machine which concerns on Embodiment 8 of this invention. It is a graph which shows the relationship between the mass of the complementary pole of FIG. 10 and the maximum stress generated in the cylinder part of a rotor core. It is a top view which shows the main part of the rotor of the rotary electric machine which concerns on Embodiment 9 of this invention. It is a top view which shows the main part of the rotor of the rotary electric machine which concerns on Embodiment 10 of this invention. It is a top view which shows the modification of the main part of the rotor of the rotary electric machine of FIG. It is a top view which shows the main part of the rotor of the rotary electric machine which concerns on Embodiment 11 of this invention. It is a contour figure which shows the eddy current loss which occurs in the complementary electrode when a rotor rotates at a high speed. It is a top view which shows the main part of the rotor of the rotary electric machine which concerns on Embodiment 12 of this invention. It is a contour figure which shows the eddy current loss which occurs in the complementary electrode when a rotor rotates at a high speed. It is a perspective view which shows the rotor of the rotary electric machine which concerns on Embodiment 13 of this invention. It is a perspective view which shows the rotor of the rotary electric machine which concerns on Embodiment 14 of this invention. It is a perspective view which shows the modification of the rotor of the rotary electric machine of FIG.

Embodiment 1.
FIG. 1 is a cross-sectional view showing a rotary electric machine according to a first embodiment of the present invention. The rotary electric machine 1 is provided on the frame 2, the stator 3 provided on the frame 2 and formed in a cylindrical shape, the rotor 4 provided inside the stator 3, and the rotor 4 provided on the frame 2. It includes a pair of bearings 5 to support.

The frame 2 has a cylindrical outer peripheral portion 21 and a pair of end plates 22 provided at both ends of the outer peripheral portion 21 in the axial direction of the outer peripheral portion 21. One bearing 5 is provided for each of the pair of end plates 22. The stator 3 is fixed to the inner peripheral surface of the outer peripheral portion 21. Further, the stator 3 is arranged between the pair of end plates 22 in the axial direction of the outer peripheral portion 21.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. Frame 2 is not shown in FIG. The rotor 4 includes a shaft 401 and a rotor core 402 provided on the shaft 401. The shaft 401 is arranged so as to extend in the axial direction of the stator 3. As shown in FIG. 1, the shaft 401 is supported by a pair of bearings 5. Since the shaft 401 is supported by the stator 3 via the pair of bearings 5, the rotor 4 can rotate with respect to the stator 3 in the circumferential direction of the rotor 4.

As shown in FIG. 2, the rotor core 402 includes a rotor core cylindrical portion 403 formed in a cylindrical shape, a plurality of main poles 404 provided on the outer peripheral surface of the rotor core cylindrical portion 403, and a rotor core. It has a plurality of auxiliary poles 405 provided on the outer peripheral surface of the cylindrical portion 403.

The rotor core cylindrical portion 403 and the main pole 404 are configured by laminating a plurality of electromagnetic steel plates in the axial direction of the rotor core cylindrical portion 403. Each of the plurality of electromagnetic steel sheets constituting the rotor core cylindrical portion 403 and the main pole 404 is formed in a state in which the portion constituting the rotor core cylindrical portion 403 and the portion constituting the main pole 404 are connected to each other. In other words, each of the plurality of electromagnetic steel sheets constituting the rotor core cylindrical portion 403 and the main pole 404 is formed of one electrical steel sheet.

A shaft 401 is inserted into the inner peripheral surface of the rotor core cylindrical portion 403. The rotor core cylindrical portion 403 is fixed to the shaft 401 by shrink fitting, press fitting, or the like.

The plurality of main poles 404 are arranged side by side at intervals in the circumferential direction of the rotor core cylindrical portion 403. The main pole 404 projects from the outer peripheral surface of the rotor core cylindrical portion 403 toward the stator 3 side.

The plurality of auxiliary poles 405 are arranged side by side at intervals in the circumferential direction of the rotor core cylindrical portion 403. The auxiliary pole 405 is arranged between the main poles 404 adjacent to each other in the circumferential direction of the rotor core cylindrical portion 403. Further, the auxiliary pole 405 projects from the outer peripheral surface of the rotor core cylindrical portion 403 toward the stator 3 side.

The size of the auxiliary pole 405 in the circumferential direction of the rotor core cylindrical portion 403 is constant regardless of the position of the rotor core cylindrical portion 403 in the radial direction.

The outer peripheral surface of the auxiliary pole 405 in the radial direction of the rotor core cylindrical portion 403, in other words, the surface of the auxiliary pole 405 facing the stator 3 is referred to as the auxiliary pole outer peripheral surface 406. The outer peripheral surface of the main pole 404 in the radial direction of the rotor core cylindrical portion 403, in other words, the surface of the main pole 404 facing the stator 3 is referred to as the main pole outer peripheral surface 407. The outer peripheral surface of the auxiliary pole 406 and the outer peripheral surface of the main pole 407 have the same height in the radial direction of the rotor core cylindrical portion 403.

The rotor core cylindrical portion 403 and the main pole 404 are made of a magnetic material. The auxiliary pole 405 is made of a non-magnetic metal. Examples of the non-magnetic metal include stainless steel.

The stator 3 includes a stator core 31, a plurality of stator coils 32 provided on the stator core 31, and a plurality of permanent magnets 33 provided on the stator core 31. The stator core 31 is formed by laminating a plurality of electromagnetic steel sheets in the axial direction of the stator 3. Further, the stator core 31 is made of a magnetic material.

The stator core 31 has a core back 311 extending in the circumferential direction of the stator 3 and a plurality of teeth 312 protruding from the core back 311 toward the rotor 4. The plurality of teeth 312 are arranged side by side at intervals in the circumferential direction of the stator 3. Slots 313 are formed between the teeth 312 adjacent to each other in the circumferential direction of the stator 3.

The permanent magnet 33 is arranged at the center of the teeth 312 in the circumferential direction of the stator 3. The permanent magnets 33 that are adjacent to each other in the circumferential direction of the stator 3 are arranged so that their magnetic poles face each other in the circumferential direction of the stator 3 or face each other in opposite directions. In FIG. 2, the direction of the magnetic pole of the permanent magnet 33 is indicated by an arrow A.

The stator coil 32 is provided on the teeth 312. The stator coil 32 is arranged so as to surround the teeth 312 and the permanent magnets 33 provided on the teeth 312. Examples of the winding method of the stator coil 32 include concentrated winding and distributed winding. Depending on the combination of the number of main poles 404 of the rotor 4 and the number of slots 313 of the stator 3, either concentrated winding or distributed winding is selected.

In FIG. 2, the plurality of stator coils 32 are divided into three phases, a U phase, a V phase, and a W phase, and the stator coils 32 having the same phase are connected in series. Further, in FIG. 2, the plurality of stator coils 32 are arranged in the order of U1, V1, W1, U2, V2, W2 in the circumferential direction of the stator 3. Further, in FIG. 2, the plurality of stator coils 32 are wound around the teeth 312 by concentrated winding. FIG. 2 shows the direction of the current flowing through the stator coil 32 inside the stator coil 32.

In the radial direction of the rotor core cylindrical portion 403, an air gap 6 which is a gap is formed between the outer peripheral surface of the main pole 404 and the outer peripheral surface of the auxiliary pole 405 and the inner peripheral surface of the stator core 31. ..

Next, the mechanism by which the eddy current loss occurs in the rotor core 402 will be described. The magnetic field lines based on the permanent magnet 33 exit from one surface of the permanent magnet 33 in the circumferential direction of the stator 3, pass through the teeth 312 provided with the permanent magnet 33 and the air gap 6 in order, and reach the main pole 404. The lines of magnetic force that have reached the main pole 404 pass through the air gap 6 and the teeth 312 in order, and return to the other surface of the permanent magnet 33 in the circumferential direction of the stator 3.

When the rotor 4 rotates with respect to the stator 3, the transition of the magnetic field at the main pole 404 is repeated in the order of N pole, S pole, N pole, and S pole. Therefore, the magnetic field at the main pole 404 becomes an alternating magnetic field or a rotating magnetic field depending on the magnetic field based on the permanent magnet 33. Since the rotor core cylindrical portion 403 and the main pole 404 are made of an electromagnetic steel plate, they have conductivity. Therefore, in the rotor core cylindrical portion 403 and the main pole 404, an eddy current is generated so as to cancel the alternating magnetic field or the rotating magnetic field. Eddy currents are generated in the rotor core cylindrical portion 403 and the main pole 404 due to the eddy current generated in the rotor core cylindrical portion 403 and the main pole 404 and the electric resistance in the rotor core cylindrical portion 403 and the main pole 404. Therefore, heat is generated in the rotor core cylindrical portion 403 and the main pole 404.

Since the auxiliary pole 405 is composed of a non-magnetic metal, the magnetic field interlinking with the auxiliary pole 405 is weaker than the magnetic field interlinking with the main pole 404. As a result, the eddy current loss generated in the auxiliary pole 405 is smaller than the eddy current loss generated in the main pole 404.

The heat generated in the rotor core 402 is transferred from the rotor core 402 to the stator core 31 via the air gap 6. FIG. 2 shows a heat path R in which heat is transferred from the rotor core 402 to the stator core 31.

The heat generated in the rotor core 402 is transferred to the load member connected to the rotary electric machine 1 via the shaft 401. The heat is transferred to the load member connected to the rotary electric machine 1, so that the load member is deformed or the like. Therefore, heat transfer to the load member is generally undesirable. In the first embodiment, the heat generated in the rotor core 402 is transferred to the stator core 31 via the main pole 404 and the auxiliary pole 405, and is discharged from the outer peripheral surface of the rotary electric machine 1. Therefore, the temperature rise of the rotor core 402 is suppressed, and the heat generated in the rotor core 402 is suppressed from being transferred to the load member.

As described above, according to the rotor 4 of the rotary electric machine according to the first embodiment of the present invention, the rotor core cylinder is located between the main poles 404 adjacent to each other in the circumferential direction of the rotor core cylinder portion 403. A compensating pole 405 projecting from the portion 403 to the stator 3 side is provided, and the compensating pole 405 is made of a non-magnetic metal. As a result, the facing area between the outer peripheral surface of the rotor core 402 and the inner peripheral surface of the stator core 31 increases. Therefore, heat can be easily transferred from the rotor core 402 to the stator core 31 through the air gap 6. As described above, the temperature rise of the rotor core 402 can be suppressed. Further, since the heat transfer from the rotor core 402 to the stator core 31 becomes easy, the heat transfer to the load member connected to the rotary electric machine 1 can be suppressed.

Further, the auxiliary pole outer peripheral surface 406 and the main pole outer peripheral surface 407 have the same height in the radial direction of the rotor core cylindrical portion 403. As a result, the amount of heat transferred between the auxiliary pole 405 and the stator core 31 can be increased.

In the first embodiment, the configuration of the rotary electric machine 1 in which the number of main poles 404 is 5, the number of slots 313 and the number of permanent magnets 33 are 6 has been described. However, the number of main poles 404, the number of slots 313, and the number of permanent magnets 33 are not limited to this, and may be other numbers. In a stator magnet rotating electric machine in which the stator 3 includes a permanent magnet 33, the magnetomotive force is modulated by the permeance of the rotor 4. Therefore, the spatial order of the rotational magnetomotive force of the stator magnet rotary electric machine can be expressed by the value obtained by subtracting the logarithmic number of the permanent magnets 33 from the number of the main poles 404. In the rotary electric machine 1 shown in FIG. 1, the number of main poles 404 is 5, and the number of pole pairs of the permanent magnets 33 is 3. Therefore, the spatial order is 2. In this case, the rotary electric machine 1 is driven as a 4-pole 6-slot rotary electric machine. The eddy current loss of the rotary electric machine 1 changes depending on the number of poles of the permanent magnet 33, the number of main poles 404, and the rotation speed of the rotor 4. Therefore, in the case of the rotary electric machine 1 in which the number of poles of the permanent magnet 33 is large, the number of main poles 404 is large, and the rotation speed of the rotor 4 is large, the effect of suppressing the temperature rise of the rotor core 402 can be further increased. Can be done.

As for the shape of the auxiliary pole 405, it is desirable that the area of the auxiliary pole outer peripheral surface 406 is large. As the area of the auxiliary pole outer peripheral surface 406 increases, the facing area between the rotor core 402 and the stator core 31 increases. Thereby, the amount of heat transfer from the rotor core 402 to the stator core 31 can be increased.

It is desirable that the contact area between the auxiliary pole 405 and the rotor core cylindrical portion 403 is large. By increasing the contact area between the auxiliary pole 405 and the rotor core cylindrical portion 403, the heat generated in the rotor core cylindrical portion 403 and the main pole 404 is easily transferred to the auxiliary pole 405. As a result, the amount of heat transfer from the rotor core 402 to the stator core 31 can be increased.

Embodiment 2.
FIG. 3 is a perspective view showing a rotor of a rotary electric machine according to a second embodiment of the present invention. The auxiliary pole 405 is configured by laminating a plurality of thin plates. A plurality of thin plates constituting the auxiliary pole 405 are laminated in the axial direction of the rotor core cylindrical portion 403. The thin plate constituting the auxiliary pole 405 is made of a non-magnetic metal. Examples of the non-magnetic metal include stainless steel.

The thickness of the thin plate constituting the auxiliary pole 405 is the same as the thickness of the electromagnetic steel plate forming the main pole 404. Specifically, the thickness of the thin plate constituting the auxiliary pole 405 is 0.25 mm to 0.5 mm. Other configurations are the same as those in the first embodiment.

As described above, the rotor 4 of the rotary electric machine according to the second embodiment of the present invention is composed of a plurality of thin plates in which the auxiliary pole 405 is laminated in the axial direction of the rotor core cylindrical portion 403. When the rotor 4 rotates at a high speed, the eddy current loss generated in the auxiliary pole 405, which is composed of a non-magnetic metal, becomes apparent. However, the eddy current loss generated in the auxiliary pole 405 can be reduced by forming the auxiliary pole 405 from the plurality of laminated thin plates.

Further, the thickness of the thin plate constituting the auxiliary pole 405 is the same as the thickness of the electromagnetic steel plate forming the main pole 404. As a result, the eddy current loss generated in the auxiliary pole 405 can be reduced, and the production of the auxiliary pole 405 can be facilitated.

Embodiment 3.
FIG. 4 is a perspective view showing a rotor of a rotary electric machine according to a third embodiment of the present invention. Regarding the circumferential direction of the rotor core cylindrical portion 403, the surface of the main pole 404 facing the auxiliary pole 405 is referred to as the main pole circumferential side surface 408. Regarding the circumferential direction of the rotor core cylindrical portion 403, the surface of the auxiliary pole 405 facing the main pole 404 is referred to as the auxiliary pole circumferential side surface 409.

Regarding the circumferential direction of the rotor core cylindrical portion 403, a gap is formed between the main pole peripheral direction side surface 408 and the auxiliary pole peripheral direction side surface 409. In other words, a gap is formed between the main pole 404 and the auxiliary pole 405 that are adjacent to each other in the circumferential direction of the rotor core cylindrical portion 403. That is, the side surface 408 in the main pole circumferential direction and the side surface 409 in the auxiliary pole circumferential direction are arranged apart from each other in the circumferential direction of the rotor core cylindrical portion 403. A ventilation groove 410 is formed in the rotor 4 by arranging the main pole circumferential side surface 408 and the auxiliary pole circumferential side surface 409 apart from each other in the circumferential direction of the rotor core cylindrical portion 403. The ventilation groove 410 is arranged so as to extend in the axial direction of the rotor core cylindrical portion 403. The ventilation groove 410 constitutes an air passage 411 through which the wind passing through the rotor 4 passes in the axial direction of the rotor core cylindrical portion 403.

It is desirable that the area of the auxiliary pole outer peripheral surface 406 is large. By increasing the area of the auxiliary pole outer peripheral surface 406, it is possible to increase the efficiency of heat dissipation of the rotor core 402 and reduce the wind damage of the air flowing through the rotary electric machine 1. The size of the ventilation groove 410 in the circumferential direction of the rotor core cylindrical portion 403 can be appropriately set according to the cooling effect of the rotor core 402, the wind damage reduction effect, the mass of the auxiliary pole 405, and the like. .. Other configurations are the same as those of the first embodiment or the second embodiment.

As described above, according to the rotor 4 of the rotary electric machine according to the third embodiment of the present invention, the main pole 404 and the auxiliary pole 405 that are adjacent to each other in the circumferential direction of the rotor core cylindrical portion 403 are located between the main pole 404 and the auxiliary pole 405. A gap is formed. As a result, the rotor 4 is formed with a ventilation groove 410 extending in the axial direction of the rotor core cylindrical portion 403. Therefore, the efficiency of heat dissipation of the rotor core 402 can be improved. As a result, the temperature rise of the rotor core 402 can be suppressed.

Embodiment 4.
FIG. 5 is a plan view showing a main part of a rotor of a rotary electric machine according to a fourth embodiment of the present invention. The auxiliary pole 405 has a auxiliary pole main body 412 and a protrusion 413 fixed to the auxiliary pole main body 412. The protrusion 413 is an inner portion of the auxiliary pole 405 in the radial direction of the rotor core cylindrical portion 403.

The protrusion 413 is provided on the surface of the commutating pole body 412 on the side of the rotor core cylindrical portion 403. The protrusion 413 is formed in a T-shaped cross section. The protrusion 413 has a base portion 414 protruding from the auxiliary pole body 412 toward the rotor core cylindrical portion 403, and a pair of flange portions 415 extending from the base portion 414 in the circumferential direction of the rotor core cylindrical portion 403. The pair of flange portions 415 project from the base portion 414 in opposite directions with respect to the circumferential direction of the rotor core cylindrical portion 403.

A groove 416 into which the protrusion 413 is fitted is formed in the outer portion of the rotor core cylindrical portion 403 in the radial direction of the rotor core cylindrical portion 403. The groove portion 416 includes a portion into which the flange portion 415 is fitted. By fitting the flange portion 415 into the groove portion 416, it is possible to prevent the auxiliary pole 405 from being separated from the rotor core cylindrical portion 403 in the radial direction of the rotor core cylindrical portion 403. In other words, the centrifugal force prevents the auxiliary pole 405 from jumping out from the rotor core cylindrical portion 403 in the radial direction. Other configurations are the same as any of the first to third embodiments.

As described above, according to the rotor 4 of the rotary electric machine according to the fourth embodiment of the present invention, the auxiliary pole 405 has a flange portion 415 extending in the circumferential direction, and the rotor core cylindrical portion 403 has a flange portion 415 extending in the circumferential direction. Is formed with a groove portion 416 into which the flange portion 415 is fitted. By fitting the flange portion 415 into the groove portion 416, it is possible to prevent the auxiliary pole 405 from moving outward in the radial direction from the rotor core cylindrical portion 403.

When the rotor 4 rotates at high speed, the centrifugal force acting on the auxiliary pole 405 increases. Therefore, in this case, the protrusion 413 may be thickened so that the strength of the protrusion 413 is improved.

Further, the configuration in which the auxiliary pole 405 has the protrusion 413 and the groove portion 416 is formed in the rotor core cylindrical portion 403 has been described. However, the rotor core cylindrical portion 403 may have a protrusion, and a groove portion into which the protrusion may be fitted may be formed in the auxiliary pole 405.

Embodiment 5.
FIG. 6 is a plan view showing a main part of a rotor of a rotary electric machine according to a fifth embodiment of the present invention. Let X be the dimension between the inner peripheral surface of the rotor core cylindrical portion 403 and the groove portion 416 in the radial direction of the rotor core cylindrical portion 403. Let Y be the dimension of the main pole outer peripheral surface 407 in the circumferential direction of the rotor core cylindrical portion 403. In this case, the rotor 4 satisfies X> Y / 2. Other configurations are the same as those in the fourth embodiment.

As described above, according to the rotor 4 of the rotary electric machine according to the fifth embodiment of the present invention, X> Y / 2 is satisfied. As a result, it is possible to prevent the path of the magnetic flux flowing through the rotor core cylindrical portion 403 from being obstructed. Therefore, the magnetic flux saturation of the rotor core 402 is suppressed. As a result, it is possible to suppress a decrease in the output of the rotary electric machine 1 and prevent the auxiliary pole 405 from jumping out in the radial direction due to centrifugal force.

Embodiment 6.
FIG. 7 is a plan view showing a main part of a rotor of a rotary electric machine according to a sixth embodiment of the present invention. The dimension between the central axis O of the shaft 401 and the outer peripheral surface of the main pole 407 is defined as the outer diameter dimension Rm of the main pole. The dimension between the central axis O of the shaft 401 and the outer peripheral surface of the compensating pole 406 is defined as the compensating pole outer diameter dimension Rs. In this case, the rotor 4 satisfies Rs <Rm.

Depending on the characteristics of the material used for the auxiliary pole 405, the mass of the auxiliary pole 405, the size of the groove portion 416, etc., the auxiliary pole 405 may move radially outward with respect to the rotor core cylindrical portion 403 due to centrifugal force. .. The main pole outer diameter dimension Rm and the auxiliary pole outer diameter dimension Rs are determined according to the amount of movement of the auxiliary pole 405. This prevents the auxiliary pole 405 from coming into contact with the stator 3. Other configurations are the same as those in the fourth or fifth embodiment.

As described above, according to the rotor 4 of the rotary electric machine according to the sixth embodiment of the present invention, Rs <Rm is satisfied. As a result, it is possible to prevent the auxiliary pole 405 from coming into contact with the stator 3.

Embodiment 7.
FIG. 8 is an exploded perspective view showing a main part of a rotor of a rotary electric machine according to a seventh embodiment of the present invention. FIG. 9 is a perspective view showing a state in which the main part of the rotor of FIG. 8 is assembled. The rotor core cylindrical portion 403 is configured by alternately laminating a plurality of first steel plates 417 and a plurality of second steel plates 418 one by one in the axial direction of the rotor core cylindrical portion 403. An iron core notch portion 419 is formed in a portion of the second steel plate 418 on the complementary pole 405 side.

The auxiliary pole 405 is configured by alternately laminating a plurality of first thin plates 420 and a plurality of second thin plates 421 one by one in the axial direction of the rotor core cylindrical portion 403. A co-pole notch 422 is formed in a portion of the second thin plate 421 on the rotor core side. Therefore, in the radial direction of the rotor core cylindrical portion 403, the size of the second thin plate 421 is smaller than the size of the first thin plate 420.

The first thin plate 420 is inserted into the iron core notch portion 419. The first steel plate 417 is inserted into the auxiliary pole notch portion 422. The insertion direction D1 of the first steel plate 417 and the first thin plate 420 is the radial direction of the rotor core cylindrical portion 403.

The first steel plate 417 is overlapped with the first thin plate 420 in a state where the first steel plate 417 is inserted into the auxiliary pole notch portion 422. The first thin plate 420 is overlapped with the first steel plate 417 in a state where the first thin plate 420 is inserted into the iron core notch portion 419.

The first steel plate 417 is formed with a through hole 423 extending in the axial direction of the rotor core cylindrical portion 403. The first thin plate 420 is formed with a through hole 424 extending in the axial direction of the rotor core cylindrical portion 403. The through hole 423 and the through hole 424 overlap each other in the axial direction of the rotor core cylindrical portion 403 in a state where the first steel plate 417 and the first thin plate 420 are overlapped with each other.

The rotor 4 further includes a pin 425 inserted into a through hole 423 of the first steel plate 417 and a through hole 424 of the first thin plate 420. The insertion direction D2 of the pin 425 is the axial direction of the rotor core cylindrical portion 403. Other configurations are the same as any of the first to third embodiments.

As described above, according to the rotor 4 of the rotary electric machine according to the seventh embodiment of the present invention, the pin 425 is inserted into the through hole 423 of the first steel plate 417 and the through hole 424 of the first thin plate 420. .. As a result, it is possible to prevent the auxiliary pole 405 from moving radially outward with respect to the rotor core cylindrical portion 403 due to centrifugal force.

In the seventh embodiment, the plurality of first steel plates 417 and the plurality of second steel plates 418 are alternately laminated one by one in the axial direction of the rotor core cylindrical portion 403, and the plurality of first thin plates 420 and the plurality of first thin plates 420 are laminated. The configuration in which the second thin plate 421 and the second thin plate 421 are alternately laminated one by one in the axial direction of the rotor core cylindrical portion 403 has been described. However, for example, a plurality of first steel plates 417 and a plurality of second steel plates 418 may be alternately laminated in the axial direction of the rotor core cylindrical portion 403. Further, a plurality of first thin plates 420 and a plurality of second thin plates 421 may be alternately laminated in the axial direction of the rotor core cylindrical portion 403.

Embodiment 8.
FIG. 10 is a plan view showing a main part of the rotor of the rotary electric machine according to the eighth embodiment of the present invention. Let the mass of the main pole 404 be M1. Let the mass of the auxiliary pole 405 be M2. Let M3 be the mass of the auxiliary pole 405 when the auxiliary pole 405 is buried in the entire region between the main poles 404 adjacent to each other in the circumferential direction of the rotor core cylindrical portion 403. In this case, the rotor 4 satisfies M1 × 0.35 <M2 <M3.

FIG. 11 is a graph showing the relationship between the mass of the auxiliary pole 405 of FIG. 10 and the maximum stress generated in the rotor core cylindrical portion 403. The region between the main poles 404 adjacent to each other in the circumferential direction of the rotor core cylindrical portion 403 is defined as the region between the main poles. The stress generated in the rotor core cylindrical portion 403 is concentrated in the portion of the rotor core cylindrical portion 403 adjacent to the inside with respect to the region between the main poles in the radial direction of the rotor core cylindrical portion 403. By satisfying M1 × 0.35 <M2 <M3 in the rotor 4, the auxiliary pole 405 is filled in the entire region between the main poles 404 adjacent to each other in the circumferential direction of the rotor core cylindrical portion 403. , The stress generated in the rotor core cylindrical portion 403 is reduced. This indicates that the stress of the rotor core cylindrical portion 403 due to the centrifugal force pulling the main pole 404 and the auxiliary pole 405 radially outward is reduced.

It is most desirable that the rotor 4 satisfies M2 = M1. In this case, the stress generated in the rotor core cylindrical portion 403 becomes uniform in the circumferential direction of the rotor core cylindrical portion 403 and becomes the smallest. Other configurations are the same as any of the first to seventh embodiments.

As described above, according to the rotor 4 of the rotary electric machine according to the eighth embodiment of the present invention, the rotor 4 satisfies M1 × 0.35 <M2 <M3. As a result, the stress generated in the rotor core cylindrical portion 403 can be reduced.

Embodiment 9.
FIG. 12 is a plan view showing a main part of a rotor of a rotary electric machine according to a ninth embodiment of the present invention. The compensating pole outer peripheral surface 406 is the outer peripheral surface of the compensating pole 405 in the radial direction of the rotor core cylindrical portion 403. The main pole outer peripheral surface 407 is the outer peripheral surface of the main pole 404 in the radial direction of the rotor core cylindrical portion 403.

When viewed in the axial direction of the rotor core cylindrical portion 403, the auxiliary pole outer peripheral surface 406 is formed over the respective main pole outer peripheral surfaces 407 of the main poles 404 adjacent to each other in the circumferential direction of the rotor core cylindrical portion 403. Has been done. Further, when viewed in the axial direction of the rotor core cylindrical portion 403, the auxiliary pole outer peripheral surface 406 and the main pole outer peripheral surface 407 are arranged on the same circle. Thereby, the other configurations are the same as any of the first to eighth embodiments.

As described above, according to the rotor 4 of the rotary electric machine according to the ninth embodiment of the present invention, the auxiliary pole outer peripheral surface 406 is the rotor core when viewed in the axial direction of the rotor core cylindrical portion 403. It is formed over the outer peripheral surfaces of the main poles 404 of the main poles 404 adjacent to each other in the circumferential direction of the cylindrical portion 403. Further, when viewed in the axial direction of the rotor core cylindrical portion 403, the auxiliary pole outer peripheral surface 406 and the main pole outer peripheral surface 407 are arranged on the same circle. As a result, the area of the auxiliary pole outer peripheral surface 406 can be increased. As a result, the temperature rise of the rotor core cylindrical portion 403 can be suppressed. Further, the shape of the rotor core 402 is a cylindrical shape. Thereby, the wind damage of the air flowing through the rotary electric machine 1 can be reduced.

Embodiment 10.
FIG. 13 is a plan view showing a main part of the rotor of the rotary electric machine according to the tenth embodiment of the present invention. A hole 426 is formed in the auxiliary pole 405. The hole 426 is formed so as to extend in the axial direction of the rotor core cylindrical portion 403. Further, the shape of the hole 426 is an elongated hole shape extending in the circumferential direction of the rotor core cylindrical portion 403 when viewed in the axial direction of the rotor core cylindrical portion 403. Other configurations are the same as any of the first to ninth embodiments.

As described above, according to the rotor 4 of the rotary electric machine according to the tenth embodiment of the present invention, the auxiliary pole 405 is formed with a hole 426. Thereby, the mass of the auxiliary pole 405 can be reduced. Further, by forming the hole 426 in the auxiliary pole 405, the eddy current loss generated in the auxiliary pole 405 can be reduced. Further, the inertia of the rotor 4 can be reduced by reducing the mass of the auxiliary pole 405.

In the tenth embodiment, the configuration in which the hole 426 is formed in the auxiliary pole 405 has been described. However, as shown in FIG. 14, it is a portion of the auxiliary pole 405 on the rotor core cylindrical portion 403 side, and a notch portion 427 is formed at the end portion of the rotor core cylindrical portion 403 in the circumferential direction. There may be. In FIG. 14, notches 427 are formed at both ends of the rotor core cylindrical portion 403 on the rotor core cylindrical portion 403 side in the auxiliary pole 405 in the circumferential direction. Therefore, the auxiliary pole 405 is formed in a T-shaped cross section.

Embodiment 11.
FIG. 15 is a plan view showing a main part of the rotor of the rotary electric machine according to the eleventh embodiment of the present invention. A chamfered portion 428 is formed at the outer portion of the auxiliary pole 405 in the radial direction of the rotor core cylindrical portion 403 and at the end portion in the circumferential direction of the rotor core cylindrical portion 403.

FIG. 16 is a contour diagram showing the eddy current loss generated in the auxiliary pole 405 when the rotor 4 rotates at high speed. When the rotor 4 rotates at high speed, when the auxiliary pole 405 and the permanent magnet 33 face each other, the rotor core cylindrical portion is the outer portion of the auxiliary pole 405 in the radial direction of the rotor core cylindrical portion 403. Eddy current loss is concentrated at the end of the 403 in the circumferential direction. However, in the eleventh embodiment, the chamfered portion 428 is formed at the outer portion of the auxiliary pole 405 in the radial direction of the rotor core cylindrical portion 403 and at the end portion in the circumferential direction of the rotor core cylindrical portion 403. ing. Other configurations are the same as any of the fourth to tenth embodiments.

As described above, according to the rotor 4 of the rotary electric machine according to the eleventh embodiment of the present invention, the rotor core cylindrical portion is the outer portion of the auxiliary pole 405 in the radial direction of the rotor core cylindrical portion 403. A chamfered portion 428 is formed at the end portion of the 403 in the circumferential direction. As a result, the eddy current loss generated in the auxiliary pole 405 can be reduced. Therefore, the temperature rise of the rotor core 402 can be suppressed.

In the eleventh embodiment, the chamfered portion 428 is formed at the outer portion of the auxiliary pole 405 in the radial direction of the rotor core cylindrical portion 403 and at the end portion in the circumferential direction of the rotor core cylindrical portion 403. The configuration is explained. However, for example, a fillet is formed at the outer portion of the complementary pole 405 in the radial direction of the rotor core cylindrical portion 403 and at the end portion in the circumferential direction of the rotor core cylindrical portion 403 so that the corner portion is smooth. It may be a configured configuration. Even in this case, the eddy current loss generated in the auxiliary pole 405 can be reduced.

Embodiment 12.
FIG. 17 is a plan view showing a main part of a rotor of a rotary electric machine according to a twelfth embodiment of the present invention. The intermediate portion of the compensating pole 405 in the radial direction of the rotor core cylindrical portion 403 is referred to as a compensating pole intermediate portion 429. The dimension of the rotor core cylindrical portion 403 in the auxiliary pole intermediate portion 429 in the circumferential direction is smaller than the dimension L1 in the circumferential direction of the rotor core cylindrical portion 403 in the auxiliary pole outer peripheral surface 406.

The inner peripheral surface of the compensating pole 405 in the radial direction of the rotor core cylindrical portion 403, in other words, the surface of the compensating pole 405 facing the rotor core cylindrical portion 403 is referred to as the compensating pole inner peripheral surface 430. The dimension of the rotor core cylindrical portion 403 in the auxiliary pole intermediate portion 429 in the circumferential direction is smaller than the dimension L2 in the circumferential direction of the rotor core cylindrical portion 403 in the auxiliary pole inner peripheral surface 430.

FIG. 18 is a contour diagram showing the eddy current loss generated in the auxiliary pole 405 when the rotor 4 rotates at high speed. When the rotor 4 rotates at high speed, the eddy current loss is concentrated at the end of the auxiliary pole 405 in the circumferential direction of the rotor core cylindrical portion 403. However, in the twelfth embodiment, the dimension of the rotor core cylindrical portion 403 in the auxiliary pole intermediate portion 429 in the circumferential direction is smaller than the dimension L1 in the circumferential direction of the rotor core cylindrical portion 403 in the auxiliary pole outer peripheral surface 406. Further, the dimension of the rotor core cylindrical portion 403 in the auxiliary pole intermediate portion 429 in the circumferential direction is smaller than the dimension L2 in the circumferential direction of the rotor core cylindrical portion 403 in the auxiliary pole inner peripheral surface 430. Other configurations are the same as any of the first to eleventh embodiments.

As described above, according to the rotor 4 of the rotary electric machine according to the twelfth embodiment of the present invention, the dimensions of the rotor core cylindrical portion 403 in the auxiliary pole intermediate portion 429 in the circumferential direction are the auxiliary pole outer peripheral surface 406. It is smaller than the size L1 in the circumferential direction of the rotor core cylindrical portion 403. Further, the dimension in the circumferential direction of the rotor core cylindrical portion 403 in the auxiliary pole intermediate portion 429 is smaller than the dimension L2 in the circumferential direction of the rotor core cylindrical portion 403 in the auxiliary pole inner peripheral surface 430. As a result, the eddy current loss generated in the auxiliary pole 405 can be reduced. Therefore, the temperature rise of the rotor core 402 can be suppressed.

Embodiment 13.
FIG. 19 is a perspective view showing a rotor of a rotary electric machine according to a thirteenth embodiment of the present invention. The rotor core 402 is divided into two in the axial direction of the rotor core cylindrical portion 403. The rotor core 402 is not limited to two, and may be divided into three or more.

One of the portions of the rotor core 402 divided into two is referred to as the first rotor core portion 431, and the other is referred to as the second rotor core portion 432. The first rotor core portion 431 and the second rotor core portion 432 are arranged so as to be offset from each other in the circumferential direction of the rotor core cylindrical portion 403. In other words, a step skew is formed on the rotor core 402. The skew angle of the step skew is an electric angle, which is an odd multiple of 30 ° such as 30 °, 90 °, and 150 °. As a result, the sixth-order components of the cogging torque and torque ripple generated in the rotary electric machine 1 are reduced.

Each of the first rotor core portion 431 and the second rotor core portion 432 includes a rotor core cylindrical portion 403, a plurality of main poles 404, and a plurality of auxiliary poles 405. Other configurations are the same as any of the first to twelfth embodiments.

As described above, according to the rotor 4 of the rotary electric machine according to the thirteenth embodiment of the present invention, the rotor 4 is formed with a step skew. As a result, the temperature rise of the rotor core 402 can be reduced, and the cogging torque and torque ripple generated in the rotary electric machine 1 can be reduced.

Embodiment 14.
FIG. 20 is a perspective view showing a rotor of a rotary electric machine according to a fourteenth embodiment of the present invention. The plurality of electrical steel sheets constituting the main pole 404 are arranged to be continuously rotated in the circumferential direction of the rotor core cylindrical portion 403 as the axial direction of the rotor core cylindrical portion 403 is directed from one end to the other end. ing. In other words, a continuous skew is formed in the rotor core 402. As a result, the cogging torque and torque ripple generated in the rotary electric machine 1 are reduced. Other configurations are the same as any of the first to twelfth embodiments.

As described above, according to the rotor 4 of the rotary electric machine according to the fourteenth embodiment of the present invention, a continuous skew is formed in the rotor core 402. As a result, the cogging torque and torque ripple generated in the rotary electric machine 1 can be reduced. Further, by forming a continuous skew on the rotor core 402, it is possible to generate an air flow passing through the rotor core cylindrical portion 403 in the axial direction.

In the 14th embodiment, the configuration in which the auxiliary pole 405 extends straight in the axial direction of the rotor core cylindrical portion 403 has been described. However, as shown in FIG. 21, the plurality of thin plates constituting the auxiliary pole 405 are arranged in the circumferential direction of the rotor core cylindrical portion 403 from one end to the other end in the axial direction of the rotor core cylindrical portion 403. It may be continuously rotated and arranged.

1 Rotor, 2 frame, 3 stator, 4 rotor, 5 bearing, 6 air gap, 21 outer circumference, 22 end plate, 31 stator core, 32 stator coil, 33 permanent magnet, 311 core back, 312 teeth , 313 slot, 401 shaft, 402 rotor core, 403 rotor core cylindrical part, 404 main pole, 405 auxiliary pole, 406 auxiliary pole outer peripheral surface, 407 main pole outer peripheral surface, 408 main pole circumferential side surface, 409 auxiliary pole circumference Directional side surface, 410 ventilation groove, 411 air passage, 412 auxiliary pole body, 413 protrusion, 414 base part, 415 flange part, 416 groove part, 417 first steel plate, 418 second steel plate, 419 iron core notch, 420 first thin plate, 421 2nd thin plate, 422 stating pole notch, 423 through hole, 424 through hole, 425 pin, 426 hole, 427 notch, 428 chamfering part, 429 stating pole intermediate part, 430 stating pole inner peripheral surface, 431st 1st rotor core part, 432 2nd rotor core part.

The rotor of the rotor electric machine according to the present invention is provided side by side in the circumferential direction of the cylindrical rotor core cylindrical portion and the rotor core cylindrical portion, projects from the rotor core cylindrical portion toward the stator side, and is composed of a magnetic material. It is provided between the plurality of main poles provided and the main poles adjacent to each other in the circumferential direction, and has a compensating pole protruding from the cylindrical portion of the rotor core toward the stator, and the compensating pole is composed of a non-magnetic metal. , The compensating pole has a flange portion extending in the circumferential direction, and a groove portion into which the flange portion is fitted is formed in the rotor core cylindrical portion, and the rotor core cylindrical portion in the radial direction of the rotor core cylindrical portion. When the dimension between the inner peripheral surface and the groove portion is X and the dimension in the circumferential direction on the outer peripheral surface of the main pole in the radial direction is Y, X> Y / 2 is satisfied .

The rotor of the rotor electric machine according to the present invention is provided side by side in the circumferential direction of the cylindrical rotor core cylindrical portion and the rotor core cylindrical portion, projects from the rotor core cylindrical portion toward the stator side, and is composed of a magnetic material. It is provided between the plurality of main poles provided and the main poles adjacent to each other in the circumferential direction, and has a compensating pole protruding from the cylindrical portion of the rotor core toward the stator, and the compensating pole is composed of a non-magnetic metal. , The auxiliary pole has a flange portion extending in the circumferential direction, and the rotor core cylindrical portion has a groove portion into which the collar portion is fitted, or the rotor core cylindrical portion has a flange portion and is complementary. A groove into which the flange is fitted is formed in the pole, and the flange of the auxiliary pole and the groove of the rotor core cylinder are fitted, or the flange of the rotor core cylinder and the groove of the auxiliary pole are fitted. And are fitted together .

The rotor of the rotor electric machine according to the present invention is provided side by side in the circumferential direction of the cylindrical rotor core cylindrical portion and the rotor core cylindrical portion, projects from the rotor core cylindrical portion toward the stator side, and is composed of a magnetic material. It is provided between the plurality of main poles provided and the main poles adjacent to each other in the circumferential direction, and includes a compensating pole protruding from the cylindrical portion of the rotor core toward the stator, and the compensating pole is composed of a non-magnetic metal. , The auxiliary pole has a flange portion extending in the circumferential direction, and the rotor core cylindrical portion has a groove portion into which the collar portion is fitted, or the rotor core cylindrical portion has a flange portion and is complementary. A groove into which the flange is fitted is formed in the pole, and the flange of the auxiliary pole and the groove of the rotor core cylinder are fitted, or the flange of the rotor core cylinder and the groove of the auxiliary pole are fitted. And are fitted together, and the circumferential side surface of the main pole and the circumferential side surface of the auxiliary pole are arranged apart from each other to form an air passage, and the air passage is larger than the inside in the radial direction of the rotor core cylindrical portion. The outer side has a larger circumferential distance .

Claims (13)

Cylindrical rotor core Cylindrical part,
A plurality of main poles provided side by side in the circumferential direction of the rotor core cylindrical portion, projecting from the rotor core cylindrical portion toward the stator side, and made of a magnetic material,
It is provided between the main poles adjacent to each other in the circumferential direction, and is provided with an auxiliary pole protruding from the rotor core cylindrical portion toward the stator side.
The auxiliary pole is a rotor of a rotating electric machine made of a non-magnetic metal. The rotor of a rotary electric machine according to claim 1, wherein the auxiliary pole is composed of a plurality of thin plates laminated in the axial direction of the rotor core cylindrical portion. The rotor of the rotary electric machine according to claim 1 or 2, wherein a gap is formed between the main pole and the auxiliary pole that are adjacent to each other in the circumferential direction. Claim 1 to claim 1, wherein either one of the auxiliary pole and the rotor core cylindrical portion has a flange portion extending in the circumferential direction, and a groove portion into which the flange portion is fitted is formed on the other side. The rotor of the rotary electric machine according to any one of up to 3. The groove portion is formed in the rotor core cylindrical portion.
Let X be the dimension between the inner peripheral surface of the rotor core cylindrical portion and the groove portion in the radial direction of the rotor core cylindrical portion, and the circumferential direction of the outer peripheral surface of the main pole in the radial direction. The rotor of the rotary electric machine according to claim 4, wherein X> Y / 2 is satisfied when the dimension is Y. In the rotor core cylindrical portion, a plurality of first steel plates and a plurality of second steel plates having an iron core notch formed in a portion on the auxiliary pole side are alternately laminated in the axial direction of the rotor core cylindrical portion. Is composed of
The auxiliary pole is configured by alternately laminating a plurality of first thin plates and a plurality of second thin plates having auxiliary pole notches formed in a portion on the side of the rotor core cylinder portion alternately in the axial direction. ,
The first steel plate is stacked on the first thin plate in a state of being inserted into the auxiliary pole notch.
The first thin plate is stacked on the first steel plate in a state of being inserted into the iron core notch.
Each of the first steel plate and the first thin plate is formed with through holes that overlap each other in the axial direction and extend in the axial direction.
The rotor of a rotary electric machine according to any one of claims 1 to 3, further comprising a pin inserted into the through hole of the first steel plate and the through hole of the second thin plate. The mass of the main pole is M1, the mass of the complementary pole is M2, and the mass of the auxiliary pole when the auxiliary pole is buried in the entire region between the main poles adjacent to each other in the circumferential direction is M3. The rotor of the rotary electric machine according to any one of claims 1 to 6, which satisfies M1 × 0.35 <M2 <M3. The rotor of a rotary electric machine according to any one of claims 1 to 7, wherein the mass of the main pole is M1 and the mass of the complementary pole is M2, which satisfies M1 = M2. The outer peripheral surface of the auxiliary pole in the radial direction of the rotor core cylindrical portion is formed over the outer peripheral surface of each of the main poles adjacent to each other in the circumferential direction in the radial direction. And
When viewed in the axial direction of the rotor core cylindrical portion, the outer peripheral surface of the auxiliary pole and the outer peripheral surface of the main pole are arranged on the same circle, any one of claims 1 to 8. The rotor of the rotating electric machine described in the section. The rotor of a rotary electric machine according to any one of claims 1 to 9, wherein a hole is formed in the auxiliary pole. Any of claims 1 to 10, wherein a chamfered portion or a fillet is formed at the outer portion of the complementary pole in the radial direction of the rotor core cylindrical portion and at the end portion in the circumferential direction. The rotor of the rotary electric machine according to the first paragraph. The radial dimension in the intermediate portion of the auxiliary pole in the radial direction of the rotor core cylindrical portion is the circumferential dimension in the outer peripheral surface of the auxiliary pole in the radial direction and the complementary pole in the radial direction. The rotor of a rotary electric machine according to any one of claims 1 to 11, which is smaller than the dimension in the circumferential direction on the inner peripheral surface of the pole. The rotor according to any one of claims 1 to 12, and the rotor.
A rotary electric machine equipped with the stator.

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