JP2006320109A - Rotating electric machine and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating electric machine improved in the assembling performance of a magnet while suppressing the enlargement of a rotor, and a manufacturing method of the rotating electric machine. <P>SOLUTION: The rotating electric machine 1 comprises a stator 2 having a winding 6, and the rotor 3 wherein a main magnet 9 that is magnetized in the radial direction and an auxiliary magnet 10 magnetized in a direction other than the radial direction are alternately arranged at a rotor core 8 that is rotatably supported to the stator 2. The rotor core 8 comprises, at its external periphery, a plurality of stepped faces 13, 14 each having a difference in elevation in the radial direction, and a plurality of connecting faces 15 that connect the adjacent stepped faces 13, 14 in the radial direction. The main magnet 9 and the auxiliary magnet 10 are arranged on the stepped faces 13, 14, respectively. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine.

  Conventionally, as disclosed in Patent Document 1, a rotating electrical machine having a permanent magnet as a Halbach array has been proposed. The rotating electrical machine disclosed in Patent Document 1 includes a plurality of main magnets magnetized in the radial direction and a plurality of auxiliary magnets magnetized in a direction other than the radial direction. The main magnets are arranged at intervals in the circumferential direction, and the auxiliary magnets are arranged between the main magnets. These main magnets and auxiliary magnets have a substantially cylindrical shape as a whole. As described above, when the permanent magnets (main magnet and auxiliary magnet) are arranged in the Halbach array, the magnetic force in a specific direction can be increased. Accordingly, a rotating electrical machine having permanent magnets arranged in Halbach can use a larger amount of magnet torque than a rotating electrical machine having permanent magnets in a normal arrangement formed of, for example, the same amount of permanent magnets. High output can be achieved without increasing the size of the electric machine.

  By the way, in the rotary electric machine of patent document 1, the main magnet and the auxiliary magnet are magnetized in different directions. Further, when a plurality of auxiliary magnets are arranged between the main magnets, the auxiliary magnets may be magnetized in different directions. Therefore, it is difficult to form a permanent magnet in which a main magnet and an auxiliary magnet are integrally formed by magnetizing a cylindrical magnetic body. Accordingly, a plurality of main magnets and auxiliary magnets are formed by individually magnetizing parts made of a magnetic material, and the plurality of main magnets and auxiliary magnets are assembled to form a cylindrical shape. However, when a plurality of main magnets and auxiliary magnets are assembled into a cylindrical shape, the number of magnets is large, so that the positioning thereof takes time. Moreover, it is necessary to use a jig for assembling a plurality of main magnets and auxiliary magnets, and there is a problem that the assemblability of the main magnets and auxiliary magnets is poor.

Therefore, in the rotating electrical machine disclosed in Patent Document 1, a plurality of grooves and holes are provided as restraining portions on the outer peripheral surface of the rotor core to which the main magnet and the auxiliary magnet are fixed, and the main magnet and the auxiliary magnet are provided in the grooves and holes. By assembling, the assembling property of the main magnet and the auxiliary magnet is improved.
JP 2002-354721 A (FIGS. 14 to 19)

  However, in the rotating electrical machine disclosed in Patent Document 1, a magnet restraining member is interposed between adjacent magnets. Therefore, when the size of the auxiliary magnet and the main magnet is not changed, the outer diameter of the rotor is increased by the amount of the magnet restraining member, and the rotating electrical machine including the rotor is enlarged. There was a problem that. In recent years, thinning and miniaturization have been desired in various electric appliances. In addition, the number of parts mounted on automobiles is steadily increasing, and it is desired to reduce the size of rotating electrical machines mounted on automobiles. For this reason, it is not desirable to increase the size of rotating electrical machines mounted on electrical appliances and automobiles.

  Here, it is conceivable to reduce the circumferential width of the auxiliary magnet and the main magnet by the amount of the magnet restraining member, but the amount of magnetic flux decreases as the volume of the main magnet and the auxiliary magnet decreases. This leads to a decrease in performance.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a rotating electrical machine that is excellent in assembling properties of a magnet while suppressing an increase in size of a rotor, and a method for manufacturing the rotating electrical machine. There is.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a stator having windings, a rotor core supported rotatably with respect to the stator, and radially arranged and arranged on an outer periphery of the rotor core. A rotating electric machine including a plurality of main magnets and a rotor having a plurality of auxiliary magnets magnetized in a direction other than a radial direction and arranged between the main magnets on an outer periphery of the rotor core, The outer periphery includes a plurality of step surfaces having a height difference in the radial direction, and a plurality of connection surfaces that connect the step surfaces adjacent in the circumferential direction in the radial direction, and the main magnet and the auxiliary magnet are respectively It arrange | positions on the said level | step difference surface.

  According to a second aspect of the present invention, the main magnet and the auxiliary magnet are configured such that a sum of circumferential widths of side surfaces on the rotor core side of the main magnet and the auxiliary magnet disposed on the step surfaces is the main magnet and the auxiliary magnet. It is formed so as to be equal to the circumferential width of the step surface on which the magnet and the auxiliary magnet are arranged, and the boundary between the adjacent magnets is formed so as to coincide with the radial direction.

  According to a third aspect of the present invention, in the rotating electrical machine according to the first or second aspect, the main magnet and the auxiliary magnet disposed on the step surface other than the lowest step surface formed at least The radial position of the side surface on the stator side coincides with the radial position of the side surface on the stator side in at least one of the main magnet and the auxiliary magnet disposed on the step surface formed lowest. As described above, the radial width is shorter than at least one of the main magnet and the auxiliary magnet disposed on the step surface formed at the lowest level.

According to a fourth aspect of the present invention, in the rotating electric machine according to the third aspect, the main magnets are respectively disposed on the step surfaces formed to be lowest.
According to a fifth aspect of the present invention, in the rotating electrical machine according to any one of the first to fourth aspects, the rotor core is fixed to a magnet made of soft magnetic metal in which the step surface and the connection surface are formed. Has a ring.

  The invention according to claim 6 includes a stator having windings, a rotor core supported rotatably with respect to the stator, a plurality of main magnets magnetized in a radial direction and disposed on an outer periphery of the rotor core, And a rotating electrical machine manufacturing method for manufacturing a rotating electrical machine including a rotor having a plurality of auxiliary magnets that are magnetized in a direction other than the radial direction and disposed between the main magnets on the outer periphery of the rotor core, A plurality of step surfaces having a difference in height in the radial direction and a plurality of connection surfaces connecting the step surfaces adjacent in the circumferential direction in the radial direction are provided on the outer periphery, and the main surface is formed on the lowest step surface. At least one of the magnet and the auxiliary magnet is disposed, and then, the main magnet and the auxiliary on the step surface adjacent to the step surface on which one of the main magnet and the auxiliary magnet is disposed first in the circumferential direction. Any of the magnets One is located.

(Function)
According to invention of Claim 1, the main magnet and the auxiliary magnet are each arrange | positioned on the level | step difference surface. Therefore, among the step surfaces having a height difference in the radial direction, the magnet (which may be either the main magnet or the auxiliary magnet) disposed on the step surface formed lower than the step surface at the highest position is the connection surface. Positioning in the circumferential direction is made by abutting on. Of the step surfaces having a difference in height in the radial direction, the magnet disposed on the step surface at the highest position corresponds to the magnet disposed on the step surface adjacent to the step surface on which the magnet is disposed. Positioning in the circumferential direction is performed by contact. Therefore, the main magnet and the auxiliary magnet can be easily assembled, and a jig need not be used to assemble the main magnet and the auxiliary magnet. Moreover, in the rotor of this invention, since a magnet restraining member is not interposed between adjacent magnets like in the past, an increase in the size of the rotor is suppressed compared to a conventional rotor. Therefore, it is possible to provide a rotating electrical machine that is excellent in magnet assembly while suppressing an increase in size of the rotor.

  In the present invention, the difference in height in the radial direction corresponds to a difference in distance from the center of the rotor core (distance along the radial direction of the rotor core). The step surface is assumed to be at a higher position in the radial direction as it is closer to the stator along the radial direction. Therefore, in the inner rotor type rotating electrical machine, the stepped surface is located at a higher position in the radial direction as the position is farther from the center of the rotor core. On the contrary, in the outer rotor type rotating electrical machine, the stepped surface is located at a higher position in the radial direction as it is closer to the center of the rotor core.

  According to invention of Claim 2, a main magnet and an auxiliary magnet will be arrange | positioned without the clearance gap in the circumferential direction. Therefore, the circumferential positions of the main magnet and the auxiliary magnet are easily determined in one place, and the assembling property of the main magnet and the auxiliary magnet is further improved. Further, rattling in the circumferential direction of the main magnet and the auxiliary magnet is suppressed.

  According to the third aspect of the present invention, the stator side surfaces of the main magnet and the auxiliary magnet are flush with each other. Therefore, the radial distance between the stator and the rotor is kept constant, and the radial width of the air gap (the space between the stator and the rotor) is constant regardless of the circumferential position.

  According to the invention described in claim 4, since the main magnet is disposed on the step surface formed to be the lowest, the auxiliary magnet is disposed on the step surface at a position higher than the step surface formed to be the lowest. Will be placed. Accordingly, the radial width of the auxiliary magnet is shorter than the radial width of the main magnet. As a result, the magnetic flux flows more easily than in the case where the auxiliary magnet is arranged on the lowest stepped surface and the radial width of the auxiliary magnet is longer than the radial width of the main magnet. Performance degradation is suppressed.

According to the invention described in claim 5, since the magnet fixing ring functions as a back yoke, the magnetic flux density on the stator side is increased. Therefore, the performance deterioration of the rotating electrical machine is further suppressed.
According to the sixth aspect of the present invention, the magnet (which may be either the main magnet or the auxiliary magnet) is first arranged on the step surface formed lowest among the step surfaces having a height difference in the radial direction. The At this time, the arranged magnets are positioned in the circumferential direction by abutting against the connection surface. Thereafter, either the main magnet or the auxiliary magnet is arranged on the step surface adjacent in the circumferential direction to the step surface on which the magnet is arranged first. At this time, the magnet disposed later is positioned in the circumferential direction by contacting the magnet disposed earlier. Therefore, the main magnet and the auxiliary magnet can be easily assembled, and a jig need not be used to assemble the main magnet and the auxiliary magnet. Moreover, since the magnet restraining member is not interposed between the adjacent magnets as in the prior art, an increase in the size of the rotor is suppressed as compared with the conventional rotor. Therefore, the main magnet and the auxiliary magnet can be easily assembled while suppressing an increase in size of the rotor.

  ADVANTAGE OF THE INVENTION According to this invention, the rotary electric machine excellent in the assembly | attachment property of a magnet, suppressing the enlargement of a rotor, and the manufacturing method of this rotary electric machine can be provided.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
First, the configuration of the rotating electrical machine of the present embodiment will be described. As shown in FIG. 1, the rotating electrical machine 1 of this embodiment includes a stator 2 and a rotor 3.

  The stator 2 includes a stator core 4 formed in a substantially cylindrical shape, a plurality of (in this embodiment, 12) teeth 5 radially formed inside the stator core 4, and windings wound around these teeth 5. 6 is provided. The winding 6 is connected to a power supply device (not shown). The winding 6 is configured to generate a rotating magnetic field for rotating the rotor 3 when power is supplied from the power supply device.

  The rotor 3 is rotatably supported inside the stator 2. The rotor 3 includes a rotating shaft 7, a rotor core 8 provided to be rotatable with respect to the stator 2 around the rotating shaft 7, a plurality (eight in this embodiment) of main magnets 9, and a plurality ( In this embodiment, eight auxiliary magnets 10 are provided.

  The rotor core 8 includes a rotor core body 11 having a cylindrical shape and a magnet fixing ring 12 that is externally fitted to the rotor core body 11. The magnet fixing ring 12 is made of a soft magnetic metal and has a substantially cylindrical shape. As shown in FIG. 2, the magnet fixing ring 12 includes a plurality of (eight in the present embodiment) step surfaces 13 provided on the outer periphery of the magnet fixing ring 12 and a radial direction (radial direction) from the step surfaces 13. And a plurality (eight in this embodiment) of stepped surfaces 14 provided at positions on the outside. The step surfaces 13 are provided at equiangular intervals in the circumferential direction, and step surfaces 14 are provided between the step surfaces 13. The step surface 13 and the step surface 14 have a height difference in the radial direction by forming the step surface 14 radially outside the step surface 13. The height difference between the step surface 13 and the step surface 14 is smaller than the radial width of the main magnet 9 and the auxiliary magnet 10. These step surfaces 13 and 14 have an arc shape with the center of curvature at the inner diameter center O of the magnet fixing ring 12 (same as the center of the rotor core). Further, the step surfaces 13 and 14 adjacent to each other in the circumferential direction are connected in the radial direction by a connection surface 15 formed along the radial direction. The connection surface 15 coincides with the radial direction of the rotor 3 when viewed from the axial direction.

  As shown in FIG. 1, the main magnet 9 and the auxiliary magnet 10 are disposed on the outer periphery of the rotor core 8. Specifically, the main magnet 9 and the auxiliary magnet 10 are fixed to the outer periphery of the magnet fixing ring 12 with an adhesive or the like. The main magnets 9 are respectively fixed on the step surfaces 13, and the auxiliary magnets 10 are respectively fixed on the step surfaces 14 provided radially outside the step surfaces 13. Thereby, the main magnet 9 and the auxiliary magnet 10 are alternately arranged in the circumferential direction, and one auxiliary magnet 10 is arranged between the main magnets 9 one by one. The boundary between the adjacent main magnet 9 and auxiliary magnet 10 coincides with the radial direction of the rotor 3.

  The auxiliary magnet 10 disposed on the step surface 14 has a step surface formed such that the radial position of the side surface 10a on the stator 2 side (radially outer side) of the auxiliary magnet 10 is lower than the step surface 14 in the radial direction. The width in the radial direction is shorter than the width in the radial direction of the main magnet 9 so as to coincide with the radial position of the side surface 9 a on the side of the stator 2 in the main magnet 9 disposed on 13. In the present embodiment, the ratio between the radial width of the main magnet 9 and the radial width of the auxiliary magnet 10 is 6: 5. Therefore, the side surfaces 9a and 10a on the stator 2 side in the main magnet 9 and the auxiliary magnet 10 are flush with each other. Further, the main magnet 9 and the auxiliary magnet 10 are formed such that the circumferential width of the side surface 9 a on the stator 2 side in the main magnet 9 is equal to the circumferential width of the side surface 10 a on the stator 2 side in the auxiliary magnet 10. . Further, the main magnet 9 and the auxiliary magnet 10 are arranged such that the circumferential widths of the side surfaces 9b, 10b on the rotor core 8 side (inner side in the radial direction and opposite to the stator 2) are the same. The stepped surfaces 13 and 14 are formed to have the same width in the circumferential direction. The side surfaces 9b and 10b of the main magnet 9 and the auxiliary magnet 10 on the rotor core 8 side have an arc shape with a curvature equal to the curvature of the step surfaces 13 and 14 on which the main magnets 9 and the auxiliary magnets 10 are arranged. .

  These main magnets 9 are brought into contact with the connection surfaces 15 provided on both sides in the circumferential direction of each connection surface 15 (including the case of direct contact as well as the case of contact via a fixing adhesive). Positioning in the circumferential direction is performed. The auxiliary magnet 10 is positioned in the circumferential direction by contacting the main magnet 9 adjacent in the circumferential direction. The main magnet 9 and the auxiliary magnet 10 that are fixed to the magnet fixing ring 12 together with the magnet fixing ring 12 form a cylindrical shape as a whole.

  The main magnet 9 is magnetized along the radial direction, and the auxiliary magnet 10 is perpendicular to the center line Ls of the auxiliary magnet 10 extending in the radial direction on a plane orthogonal to the rotation shaft 7. Is magnetized along. In FIG. 1, the magnetization directions of the main magnet 9 and the auxiliary magnet 10 are indicated by arrows. The main magnet 9 is uniformly magnetized in the circumferential direction, and the auxiliary magnet 10 is uniformly magnetized in the radial direction. One magnetic pole is composed of one main magnet 9 and half of the auxiliary magnet 10 arranged on both sides of the main magnet 9 in the circumferential direction. That is, the rotor 3 of this embodiment is an 8-pole surface magnet type rotor.

  Next, the manufacturing method of the rotary electric machine 1 comprised as mentioned above is demonstrated. In the rotating electrical machine 1 of the present embodiment, the method of assembling the main magnet 9 and the auxiliary magnet 10 will be described because the method of assembling the main magnet 9 and the auxiliary magnet 10 is characteristic.

  First, the magnetized main magnet 9 is bonded and fixed onto the step surface 13 of the magnet fixing ring 12. At this time, the main magnet 9 is positioned in the circumferential direction by contacting the two connection surfaces 15 provided on both sides in the circumferential direction of the step surface 13.

  Next, the magnetized auxiliary magnet 10 is bonded and fixed on the step surface 14 that is adjacent to the step surface 13 in the circumferential direction and is provided at a position higher in the radial direction than the step surface 13. When the auxiliary magnet 10 is bonded and fixed, the assembly of the main magnet 9 and the auxiliary magnet 10 is completed. At this time, the auxiliary magnet 10 is positioned in the circumferential direction by coming into contact with the main magnet 9 previously bonded and fixed to the step surface 13. Then, the magnet fixing ring 12 in a state where the main magnet 9 and the auxiliary magnet 10 are fixed is fixed to the rotor core body 11.

  Here, about the rotary electric machine 1 of this embodiment, the result of having measured the torque-rotational speed characteristic and the torque-current characteristic is shown in FIG. Moreover, the result of having measured the torque-efficiency characteristic about the rotary electric machine 1 of this embodiment is shown in FIG. Further, as a comparative example, FIG. 6 shows the results of measuring the torque-rotational speed characteristics and torque-current characteristics of the rotating electrical machine 21 shown in FIG. 3, and FIG. 7 shows the results of measuring the torque-efficiency characteristics. The main magnet 23 and the auxiliary magnet 24 of the rotor 22 provided in the rotating electrical machine 21 are formed to have the same radial width as the main magnet 9 provided in the rotating electrical machine 1.

  As can be seen from FIG. 4 and FIG. 6, the rotating electrical machine 1 and the rotating electrical machine 21 have substantially the same measurement results in the torque-rotational speed characteristics and the torque-current characteristics. As can be seen from FIG. 5 and FIG. 7, the rotating electrical machine 1 and the rotating electrical machine 21 obtain measurement results with substantially the same torque-efficiency characteristics. From these, it can be seen that the rotating electrical machine 1 of the present embodiment can obtain substantially the same characteristics as the rotating electrical machine 21 of the comparative example in which the main magnet 23 and the auxiliary magnet 24 have the same radial width.

As described above, according to the present embodiment, the following actions and effects are obtained.
(1) The main magnet 9 is disposed on the step surface 13, and the auxiliary magnet 10 is disposed on the step surface 14. Therefore, when the main magnet 9 is disposed on the step surface 13 formed so as to be lower among the step surfaces 13 and 14 having a height difference in the radial direction, the disposed main magnet 9 is brought into contact with the connection surface 15. Positioning in the circumferential direction is performed. The auxiliary magnet 10 is disposed on the step surface 14 that is adjacent to the step surface 13 in which the main magnet 9 is first disposed in the circumferential direction, so that the auxiliary magnet 10 is in contact with the main magnet 9 that is disposed in the circumferential direction. Positioning is done. Therefore, the main magnet 9 and the auxiliary magnet 10 can be easily assembled, and a jig may not be used for assembling the main magnet 9 and the auxiliary magnet 10. Moreover, in the rotor 3 of this embodiment, since a magnet restraining member is not interposed between adjacent magnets as in the prior art, an increase in size is suppressed compared to a rotor provided in a conventional rotating electrical machine. Is done. Therefore, it is possible to provide the rotating electrical machine 1 that is excellent in assembling properties of the magnet while suppressing an increase in the size of the rotor 3.

  (2) The main magnet 9 and the auxiliary magnet 10 include the circumferential widths of the side surfaces 9b and 10b on the rotor core 8 side of the main magnet 9 and the auxiliary magnet 10 disposed on the stepped surfaces 13 and 14, the main magnet 9 and The stepped surfaces 13 and 14 on which the auxiliary magnets 10 are arranged are formed to have the same circumferential width, and the boundary between the adjacent magnets 9 and 10 is formed to coincide with the radial direction. Therefore, the end surfaces on both sides in the circumferential direction of the main magnet 9 disposed on the lowest step surface 13 are in contact with the connection surfaces 15 provided on both sides in the circumferential direction of the step surface 13. Therefore, the main magnet 9 is prevented from rattling in the circumferential direction by the two connection surfaces 15. Since the main magnet 9 is positioned at one location in the circumferential direction of the rotor core 8 by the two connection surfaces 15, it is easier to arrange the auxiliary magnet 10 that is positioned in the circumferential direction by contacting the main magnet 9. . As a result, the assembling property of the main magnet 9 and the auxiliary magnet 10 is further improved. Further, since the main magnet 9 and the auxiliary magnet 10 are arranged without gaps in the circumferential direction, rattling of the main magnet 9 and the auxiliary magnet 10 in the circumferential direction is suppressed, and vibration and noise in the rotating electrical machine 1 are suppressed. Occurrence can be suppressed.

  (3) The auxiliary magnet 10 disposed on the step surface 14 is formed such that the radial position of the side surface 10a on the stator 2 side (radially outer side) of the auxiliary magnet 10 is lower than the step surface 14 in the radial direction. The radial width of the main magnet 9 disposed on the stepped surface 13 is shorter than the radial width of the main magnet 9 so as to coincide with the radial position of the side surface 9a on the stator 2 side. Yes. Therefore, the side surfaces 9a and 10a on the stator 2 side in the main magnet 9 and the auxiliary magnet 10 are flush with each other. Therefore, the radial distance between the stator 2 and the rotor 3 is kept constant, and the radial width of the air gap (the space between the stator 2 and the rotor 3) is constant regardless of the circumferential position. become. As a result, the occurrence of torque unevenness in the rotating electrical machine 1 can be suppressed, and the generation of vibration and noise in the rotating electrical machine 1 can be suppressed.

  (4) Since the main magnet 9 is disposed on the step surface 13 that is lower in the radial direction, the auxiliary magnet 10 is disposed on the step surface 14 that is higher in the radial direction than the step surface 13. Therefore, the radial width of the auxiliary magnet 10 is shorter than the radial width of the main magnet 9. As a result, the magnetic flux flows more easily than the case where the auxiliary magnet 10 is disposed on the stepped surface 14 and the radial width of the auxiliary magnet 10 is longer than the radial width of the main magnet 9. Reduction is suppressed. The main magnet 9 and the auxiliary magnet 10 are fixed to a magnet fixing ring 12 made of soft magnetic metal. Therefore, since the magnet fixing ring 12 functions as a back yoke, the magnetic flux density on the stator 2 side is increased. As a result, the performance deterioration of the rotating electrical machine 1 is further suppressed. Therefore, the rotating electrical machine 1 of the present embodiment obtains motor characteristics that are substantially equal to the rotating electrical machine 21 of the comparative example in which the radial widths of the main magnet 23 and the auxiliary magnet 24 are formed to be equal to the radial width of the main magnet 9. be able to.

  (5) The side surfaces 9b and 10b opposite to the stator 2 of the main magnet 9 and the auxiliary magnet 10 have an arc shape with a curvature equal to the curvature of the step surfaces 13 and 14 on which the main magnet 9 and the auxiliary magnet 10 are disposed. I am doing. Therefore, the main magnet 9 and the auxiliary magnet 10 are more easily disposed on the step surfaces 13 and 14. Moreover, since the main magnet 9 and the auxiliary magnet 10 are stably fixed on the step surfaces 13 and 14, the main magnet 9 and the auxiliary magnet 10 can be prevented from falling off from the magnet fixing ring 12.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the circumferential width of the side surface 9a on the stator 2 side in the main magnet 9 and the circumferential width of the side surface 10a on the stator 2 side in the auxiliary magnet 10 are formed to be equal, but this is not restrictive. . For example, the circumferential width of the side surface 9 a on the stator 2 side in the main magnet 9 may be formed shorter than the circumferential width of the side surface 10 a on the stator 2 side in the auxiliary magnet 10.

  In the above embodiment, the step surfaces 13 and 14 have an arc shape with the center of curvature O of the inner diameter center O of the magnet fixing ring 12. However, the step surfaces 13 and 14 may be planar. In this case, the radially inner side surfaces 9 b and 10 b of the main magnet 9 and the auxiliary magnet 10 may be formed in a flat shape according to the step surfaces 13 and 14.

  In the above-described embodiment, the main magnet 9 fixed to the step surface 13 at the lower position in the radial direction among the step surfaces 13 and 14 is fixed to the step surface 13 after magnetization. However, the main magnet 9 may be magnetized after being fixed to the stepped surface 13.

  The rotor core 8 may be configured without the magnet fixing ring 12. In this case, the rotor core 8 is composed only of the rotor core body 11, and the step surfaces 13 and 14 and the connection surface 15 are provided on the outer periphery of the rotor core body 11. If comprised in this way, since a number of parts will reduce, reduction of manufacturing cost can be aimed at.

  In the above embodiment, the main magnet 9 is disposed on the step surface 13 that is lower in the radial direction, and the auxiliary magnet 10 is disposed on the step surface 14 that is higher in the radial direction than the step surface 13. However, the auxiliary magnet 10 may be disposed on the step surface 13 and the main magnet 9 may be disposed on the step surface 14.

  In the above embodiment, the main magnet 9 and the auxiliary magnet 10 are formed so that the ratio of the radial width of the main magnet 9 to the radial width of the auxiliary magnet 10 is 6: 5. Not limited to. The ratio of the radial width of the main magnet 9 to the radial width of the auxiliary magnet 10 is such that the radial position of the side surface 10a on the stator 2 side of the auxiliary magnet 10 and the side surface 9a of the main magnet 9 on the stator 2 side. What is necessary is just to set according to the height difference of the radial direction of the level | step difference surfaces 13 and 14 so that the radial direction position may correspond.

  In the above embodiment, the magnet fixing ring 12 is provided with two types of step surfaces 13 and 14 having different radial heights (having a height difference in the radial direction). However, three or more step surfaces may be provided. For example, on the outer periphery of the magnet fixing ring 31 shown in FIG. 8 (only one quarter of the cylindrical magnet fixing ring 31 is shown in FIG. 8), there are eight step surfaces 32, the step surfaces. Sixteen step surfaces 33 provided at positions higher in the radial direction than 32 and eight step surfaces 34 provided at positions higher in the radial direction than the step surfaces 33 are provided. The step surfaces 32 are provided at equiangular intervals in the circumferential direction, and the step surfaces 33 are provided between the step surfaces 32. Further, the step surface 34 is provided between the step surface 32 and the step surface 33. The step surfaces 32 and 33 adjacent to each other in the circumferential direction are connected in the radial direction by the connection surface 35. Further, the step surfaces 33 and 34 adjacent to each other in the circumferential direction are connected in the radial direction by a connection surface 36. Thus, the magnet fixing ring 31 is provided with three types of step surfaces 32 to 34 having different radial heights. A main magnet 41 is disposed on the step surface 32, and an obliquely magnetized magnet 42 and a circumferentially magnetized magnet 43 as auxiliary magnets are disposed on the step surfaces 33 and 34. The obliquely magnetized magnet 42 is inclined with respect to the center line L1 of the obliquely magnetized magnet 42 extending in the radial direction on a plane orthogonal to the rotation axis 7, and is perpendicular to the direction perpendicular to the centerline L1. Is magnetized along the inclined direction. The circumferentially magnetized magnet 43 is magnetized along a direction perpendicular to the center line L2 of the circumferentially magnetized magnet 43 extending in the radial direction on a plane orthogonal to the rotation axis 7. The main magnet 41, the obliquely magnetized magnet 42, and the circumferentially magnetized magnet 43 have circumferential widths of the side surfaces 41b, 42b, 43b on the rotor core side, and the circumferential widths of the step surfaces 32 to 34 on which the respective circumferential surfaces are arranged. And the boundary lines between adjacent magnets 41 to 43 are formed so as to coincide with the radial direction. Further, the obliquely magnetized magnets 42 and the circumferentially magnetized magnets 43 arranged on the stepped surface 33 and the stepped surface 34 are stepped surfaces in which the radial positions of the side surfaces 42a and 43a on the stator side are the lowest. The width in the radial direction is shorter than that of the main magnet 41 so as to coincide with the radial position of the side surface 41 a on the stator side of the main magnet 41 disposed on the main magnet 41. As a result, the side surfaces 41a, 42a, 43a on the stator side (radially outer side) of the main magnet 41, the obliquely magnetized magnet 42, and the circumferentially magnetized magnet 43 are flush with each other.

  When fixing the main magnet 41, the obliquely magnetized magnet 42, and the circumferentially magnetized magnet 43 to the magnet fixing ring 31, first, the main magnet 41 is placed on the step surface 32 that is lowest in the radial direction. Be placed. At this time, the main magnet 41 is positioned in the circumferential direction by contacting the connection surfaces 35 provided on both sides of the step surface 32 in the circumferential direction. Next, the diagonally magnetized magnet 42 is disposed on the step surface 33 adjacent to the step surface 32 in which the main magnet 41 is disposed in the circumferential direction. At this time, the diagonally magnetized magnet 42 abuts on the main magnet 41 arranged in advance and the connection surface 36 provided at the circumferential end opposite to the main magnet 41 on the step surface 32. Positioning in the circumferential direction is performed. Next, the circumferentially magnetized magnet 43 is disposed on the stepped surface 34 adjacent to the stepped surface 33 in which the obliquely magnetized magnet 42 is disposed in the circumferential direction. At this time, the circumferentially magnetized magnet 43 is positioned in the circumferential direction by contacting the diagonally magnetized magnets 42 adjacent to both sides in the circumferential direction. Thus, one diagonally magnetized magnet 42 is arranged between the main magnet 41 and the circumferentially magnetized magnet 43.

  When the number of auxiliary magnets disposed between the main magnets is four or more, the number of types of stepped surfaces may be increased accordingly. Incidentally, increasing the number means increasing stepped surfaces having different radial heights. In this case, first, the main magnet is disposed on the step surface that is the lowest in the radial direction, and then the auxiliary magnet is disposed on the step surface that is adjacent to the step surface in which the main magnet is disposed first in the circumferential direction. Thereafter, the auxiliary magnets are sequentially arranged on the step surface adjacent to the step surface on which the auxiliary magnet is previously arranged in the circumferential direction.

  The order of assembling the main magnet and the auxiliary magnet is not limited to this order. The main magnet and the auxiliary magnet may be arranged in the order in which at least one of the main magnet and the auxiliary magnet is arranged last on the step surface that is highest in the radial direction. In this case, in the case of a configuration in which one main magnet or auxiliary magnet is disposed on one step surface, the magnet disposed on the step surface other than the highest step surface is disposed on at least one connection surface. It will abut. Therefore, the magnets arranged on the step surfaces other than the highest step surface are positioned in the circumferential direction by abutting against at least one abutment surface.

  With this configuration, no matter how much the number of divisions of the auxiliary magnets is increased, it is only necessary to increase the types of stepped surfaces having different radial height differences, while suppressing an increase in the size of the rotor (rotating electric machine) The assembling property of the main magnet and the auxiliary magnet can be improved.

  In the above embodiment, one auxiliary magnet 10 is disposed on one step surface 14, but the present invention is not limited to this. For example, on the outer periphery of the magnet fixing ring 51 shown in FIG. 9 (only one quarter of the cylindrical magnet fixing ring 51 is shown in FIG. 9), there are eight step surfaces 52 and step surfaces 52. There are provided eight step surfaces 53 provided at higher positions in the radial direction and 16 connection surfaces 54 for connecting the step surfaces 52 and 53 adjacent in the circumferential direction in the radial direction. The step surfaces 52 are provided at equiangular intervals in the circumferential direction, and step surfaces 53 are provided between the step surfaces 52. A main magnet 61 is disposed on the step surface 52, and two auxiliary magnets 62 are disposed on the step surface 53. Incidentally, the two auxiliary magnets 62 are inclined with respect to the center line L3 of the auxiliary magnet 62 extending in the radial direction on a plane orthogonal to the rotation axis 7 and inclined with respect to the direction perpendicular to the center line L3. This is a diagonally magnetized magnet magnetized along the direction. The main magnet 61 is formed such that the circumferential width of the side surface 61b on the rotor core side of the main magnet 61 is equal to the circumferential width of the step surface 52 on which the main magnet 61 is disposed. The two auxiliary magnets 62 are formed such that the total circumferential width of the side surfaces 62 b on the rotor core side of the two auxiliary magnets 62 arranged on the step surface 53 is equal to the circumferential width of the step surface 53. ing. The boundary between the adjacent magnets 61 and 62 coincides with the radial direction.

  In this case, in the magnet fixing ring 51, first, the main magnet 61 is disposed on the step surface 52 formed lower in the radial direction than the step surface 53. At this time, the main magnet 61 is positioned in the circumferential direction by contacting the two connection surfaces 54 provided on both sides of the step surface 52 in the circumferential direction. Next, one of the two auxiliary magnets 62 is disposed on the step surface 53 adjacent to the step surface 52 in the circumferential direction. At this time, the auxiliary magnet 62 to be arranged is positioned in the circumferential direction by contacting the main magnet 61 arranged in advance. Next, either one of the two auxiliary magnets 62 is disposed on the step surface 53. At this time, the auxiliary magnet 62 disposed later is positioned in the circumferential direction by contacting the auxiliary magnet 62 and the main magnet 61 disposed earlier. Even if comprised in this way, the assembly | attachment property of the main magnet 61 and the auxiliary magnet 62 can be improved, suppressing the enlargement of the rotary electric machine provided with this magnet fixing ring 51. FIG.

  When there are three or more auxiliary magnets 62 arranged between the main magnets 61 and three or more auxiliary magnets 62 are arranged on one step surface 53, first, the main magnet 61 is moved to the step surface 52. Place on top. Next, the auxiliary magnet 62 is disposed on the step surface 53 at a position adjacent to the main magnet 61 in the circumferential direction. Thereafter, the auxiliary magnets 62 may be sequentially arranged on the stepped surface 53 at positions adjacent to the previously disposed main magnet 61 or auxiliary magnet 62. In this way, the circumferential positioning of the auxiliary magnet 62 arranged later is performed by the main magnet 61 or auxiliary magnet 62 arranged first.

In the above embodiment, the side surfaces 9a and 10a on the stator 2 side of the main magnet 9 and the auxiliary magnet 10 are flush with each other, but the side surfaces 9a and 10a need not be flush with each other.
In the above embodiment, the main magnet 9 and the auxiliary magnet 10 have the circumferential widths of the side surfaces 9b and 10b on the rotor core 8 side of the main magnet 9 and the auxiliary magnet 10 disposed on the step surfaces 13 and 14, respectively. The circumferential widths of the step surfaces 13 and 14 on which the magnet 9 and the auxiliary magnet 10 are arranged are formed to be equal, and the boundary between the adjacent magnets 9 and 10 is formed to coincide with the radial direction. However, the main magnet 9 and the auxiliary magnet 10 may be formed such that a gap is provided between the adjacent magnets 9 and 10.

  In the above embodiment, eight step surfaces 13 and 14 having different radial heights are provided. However, the step surface provided on the outer periphery of the magnet fixing ring 12 may be provided with at least one of two types of step surfaces having different radial heights.

  A metal cover formed of stainless steel or the like may be put on the outer peripheral sides of the main magnet 9 and the auxiliary magnet 10. If comprised in this way, when the main magnet 9 and the auxiliary magnet 10 remove | deviate from the rotor core 8, for example, scattering of the main magnet 9 and the auxiliary magnet 10 can be prevented.

  In the above embodiment, the present invention is applied to the rotating electrical machine 1 including the rotor 3 having eight magnetic poles. However, the number of magnetic poles constituted by the main magnet 9 and the auxiliary magnet 10 may be less than eight. However, there may be more than 8 poles.

  In the above embodiment, the rotating electrical machine 1 is an inner rotor type, but the present invention may be applied to an outer rotor type rotating electrical machine. Further, the present invention may be applied to a rotating electric machine having a slotless stator.

The technical idea that can be grasped from the above embodiment and each of the above modifications will be described below.
(A) The rotating electrical machine according to any one of claims 1 to 5, wherein one auxiliary magnet is provided between the main magnets. If comprised in this way, one auxiliary magnet will be provided with respect to each main magnet. Therefore, a plurality of auxiliary magnets are provided for each main magnet, and the number of parts is reduced compared to the case where a plurality of auxiliary magnets are arranged in the circumferential direction between the main magnets. In addition, since the number of auxiliary magnets is small compared to the case where a plurality of auxiliary magnets are provided for each main magnet, the labor of processing the auxiliary magnets with high accuracy is saved. As a result, it is possible to shorten the manufacturing time and the manufacturing cost.

  (B) In the rotating electrical machine according to any one of claims 1 to 5, the auxiliary magnet is magnetized along a direction perpendicular to a center line extending in a radial direction of the auxiliary magnet. A circumferentially magnetized magnet, and an obliquely magnetized magnet magnetized along a direction inclined with respect to the center line, between the main magnet and the circumferentially magnetized magnet, An obliquely magnetized magnet is disposed, the main magnet is disposed on the lowest step surface, and the circumferentially magnetized magnet is disposed on the highest step surface. Rotating electric machine. If comprised in this way, compared with the case where one auxiliary magnet is each provided between each main magnet, the division | segmentation number of a magnet will increase. Therefore, torque ripple can be reduced.

  (C) In the rotating electrical machine according to any one of claims 1 to 5 and (a) and (b), the shape of the side surface of the main magnet and the auxiliary magnet opposite to the stator The rotary electric machine is characterized in that the stepped surfaces have the same shape. If comprised in this way, a main magnet and an auxiliary magnet will be arrange | positioned on a level | step difference surface more easily. In addition, since the main magnet and the auxiliary magnet are stably fixed on the step surface, the main magnet and the auxiliary magnet can be prevented from falling off from the rotor core.

  (D) a stator having windings, a rotor core that is rotatably supported with respect to the stator, a plurality of main magnets that are magnetized in the radial direction and arranged on the outer periphery of the rotor core, and are attached in a direction other than the radial direction A rotating electrical machine manufacturing method for manufacturing a rotating electrical machine including a rotor having a plurality of auxiliary magnets arranged between the main magnets on an outer periphery of the rotor core, wherein the outer periphery of the rotor core has a radial direction Are provided with a plurality of step surfaces having a height difference and a plurality of connection surfaces for connecting the step surfaces adjacent in the circumferential direction in the radial direction, and the step surface at the highest position includes a main magnet and an auxiliary magnet. At least one is arrange | positioned last, The manufacturing method of the rotary electric machine characterized by the above-mentioned. In this way, among the step surfaces having a height difference in the radial direction, a magnet (which may be either a main magnet or an auxiliary magnet) disposed on the step surface formed lower than the highest step surface. The circumferential positioning is performed by contacting at least one connection surface. Of the step surfaces having a difference in height in the radial direction, the magnet disposed on the step surface at the highest position corresponds to the magnet disposed on the step surface adjacent to the step surface on which the magnet is disposed. Positioning in the circumferential direction is performed by contact. Therefore, the main magnet and the auxiliary magnet can be easily assembled, and a jig need not be used to assemble the main magnet and the auxiliary magnet. Moreover, in the rotor of this invention, since a magnet restraining member is not interposed between adjacent magnets like in the past, an increase in the size of the rotor is suppressed compared to a conventional rotor. Therefore, it is possible to manufacture a rotating electrical machine that is excellent in magnet assembly while suppressing an increase in size of the rotor.

The schematic block diagram of the rotary electric machine concerning this embodiment. The top view of the magnet fixing ring to which the main magnet and the auxiliary magnet were fixed. The schematic block diagram of the rotary electric machine of a comparative example. The torque-rotation speed characteristic figure in the rotary electric machine of this embodiment, and a torque-current characteristic figure. The torque-efficiency characteristic figure in the rotary electric machine of this embodiment. The torque-rotation speed characteristic figure and torque-current characteristic figure in the rotary electric machine of a comparative example. The torque-efficiency characteristic figure in the rotary electric machine of a comparative example. The top view which shows the rotor of another form. The top view which shows the rotor of another form.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine, 2 ... Stator, 3 ... Rotor, 6 ... Winding, 8 ... Rotor core, 9, 41, 61 ... Main magnet, 9a, 41a ... Side surface of the main magnet on the stator side, 9b, 41b, 61b: Side surface of the main magnet on the rotor core side, 10, 62: Auxiliary magnet, 10a: Side surface of the auxiliary magnet on the stator side, 10b, 62b: Side surface of the auxiliary magnet on the rotor core side, 12, 31, 51 ... Magnet fixing ring, 13, 14, 32 to 34, 52, 53 ... step surface, 15, 35, 36, 54 ... connection surface, 42 ... diagonally magnetized magnet as auxiliary magnet, 42a ... diagonal direction as auxiliary magnet Side surface on the stator side of the magnetized magnet, 42b ... Side surface on the rotor core side of the obliquely magnetized magnet as the auxiliary magnet, 43 ... Circumferentially magnetized magnet as the auxiliary magnet, 43a ... Circumferentially magnetized magnet as the auxiliary magnet Side of the stator side, 43 ... rotor core side surface of the circumferential direction magnetized magnet as an auxiliary magnet.

Claims (6)

A stator having windings;
A rotor core supported rotatably with respect to the stator, a plurality of main magnets magnetized in the radial direction and disposed on the outer periphery of the rotor core, and between the main magnets on the outer periphery of the rotor core magnetized in a direction other than the radial direction A rotating electric machine comprising a rotor having a plurality of auxiliary magnets arranged in
The rotor core includes, on its outer periphery, a plurality of step surfaces having a height difference in the radial direction, and a plurality of connection surfaces connecting the step surfaces adjacent in the circumferential direction in the radial direction,
The rotating electric machine according to claim 1, wherein the main magnet and the auxiliary magnet are arranged on the step surface. In the rotating electrical machine according to claim 1,
The auxiliary magnet and the main magnet are arranged such that the total width in the circumferential direction of the side surface on the rotor core side of the main magnet and the auxiliary magnet arranged on each step surface is the main magnet and the auxiliary magnet. A rotating electrical machine, wherein the rotating electrical machine is formed to be equal to a circumferential width of the stepped surface, and a boundary between adjacent magnets is formed to coincide with a radial direction. In the rotating electrical machine according to claim 1 or 2,
The main magnet and the auxiliary magnet arranged on the step surface other than the lowest formed step surface have the radial position of the stator side surface on the lowest step surface. The main magnet and the auxiliary magnet arranged on the stepped surface formed to be the lowest so as to coincide with the radial position of the side surface on the stator side in at least one of the arranged main magnet and the auxiliary magnet A rotating electric machine characterized in that a radial width is shorter than at least one of the rotating electric machines. In the rotating electrical machine according to claim 3,
The rotating electric machine according to claim 1, wherein the main magnets are respectively disposed on the step surface formed to be the lowest. In the rotary electric machine according to any one of claims 1 to 4,
The rotor core includes a soft magnetic metal magnet fixing ring on which the step surface and the connection surface are formed. A stator having windings;
A rotor core supported rotatably with respect to the stator, a plurality of main magnets magnetized in the radial direction and disposed on the outer periphery of the rotor core, and between the main magnets on the outer periphery of the rotor core magnetized in a direction other than the radial direction A rotating electrical machine manufacturing method for manufacturing a rotating electrical machine comprising a rotor having a plurality of auxiliary magnets arranged in
The outer periphery of the rotor core is provided with a plurality of step surfaces having a height difference in the radial direction, and a plurality of connection surfaces connecting the step surfaces adjacent in the circumferential direction in the radial direction,
At least one of the main magnet and the auxiliary magnet is disposed on the step surface formed lowest, and then adjacent to the step surface on which one of the main magnet and the auxiliary magnet is disposed first in the circumferential direction Any one of the main magnet and the auxiliary magnet is disposed on the stepped surface.

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