JP2012231596A - Rotary electric machine and rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine, having a plurality of permanent magnets, differing in length in a direction orthogonal to a magnetization direction, embedded in an outer peripheral part of a rotor core, which can suppress increase of types of components constituting the rotary electric machine.SOLUTION: A rotary electric machine 100 includes a first permanent magnet 23a which is embedded in a rotor core 21, and has a length L1 in a direction orthogonal to the magnetization direction when viewed from an axial direction, and a second permanent magnet 23b which is embedded in the rotor core 21, and has a length L3 different from the length L1 in the direction orthogonal to the magnetization direction when viewed from an axial direction, the first permanent magnet 23a and second permanent magnet 23b comprising identical permanent magnets 24 having the length L1 and length L3 in the direction orthogonal to the magnetization direction.

Description

  The present invention relates to a rotating electrical machine and a rotor.

  Conventionally, a rotating electrical machine in which a permanent magnet is embedded in the vicinity of an outer peripheral portion of a rotor core is known (for example, see Patent Document 1).

  Patent Document 1 discloses a rotating electrical machine in which a plurality of permanent magnets are embedded in the vicinity of the outer peripheral portion of a rotor core. In the rotating electrical machine disclosed in Patent Document 1, a first permanent magnet having a first length in the direction orthogonal to the magnetization direction as viewed from the axial direction, in the vicinity of the outer peripheral portion of the rotor core, and the magnetization direction A second permanent magnet having a second length that is different from the first length in a direction perpendicular to the first length is embedded. In addition, the 1st permanent magnet and the 2nd permanent magnet are provided one by one with respect to one magnetic pole (a total of two). Further, the first permanent magnet and the second permanent magnet are arranged such that a V-shape is formed by the first permanent magnet and the second permanent magnet when viewed from the axial direction. The V-shaped inner magnetic poles (N pole or S pole) of the first permanent magnet and the second permanent magnet arranged in a V shape are arranged to be the same. In addition, it is thought that the axial direction length of the rotary electric machine of a 1st permanent magnet and a 2nd permanent magnet is substantially the same. That is, in the rotating electrical machine described in Patent Document 1, the length in the direction orthogonal to the magnetization direction is different, and the length of the rotating electrical machine in the axial direction is substantially the same (first permanent magnet and second permanent magnet). ) Is embedded in the outer periphery of the rotor core.

JP 2008-236890 A

  However, in the rotating electrical machine described in Patent Document 1, since two types of permanent magnets (first permanent magnet and second permanent magnet) are configured to be embedded in the rotor core, components constituting the rotor and the rotating electrical machine. There is a problem that the number of types increases.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to suppress an increase in the number of types of parts constituting the rotor and the rotating electrical machine. It is to provide a rotating electric machine and a rotor.

Means for Solving the Problems and Effects of the Invention

  To achieve the above object, a rotating electrical machine according to a first aspect of the present invention includes a rotor core and a first length embedded in the rotor core and having a first length in a direction orthogonal to the magnetization direction when viewed from the axial direction. A first permanent magnet and a second permanent magnet embedded in the rotor core and having a second length different from the first length in a direction orthogonal to the magnetization direction when viewed from the axial direction. And the second permanent magnet has a first length in a first direction orthogonal to the magnetization direction and a second length in a second direction orthogonal to both the magnetization direction and the first direction. It consists of the same permanent magnet having.

  A rotor according to a second aspect of the present invention is embedded in a rotor core, a first permanent magnet embedded in the rotor core and having a first length in a direction orthogonal to the magnetization direction when viewed from the axial direction, and the rotor core. And a second permanent magnet having a second length different from the first length in a direction orthogonal to the magnetizing direction when viewed from the axial direction. The first permanent magnet and the second permanent magnet are magnetized. It consists of the same permanent magnet having a first length in a first direction orthogonal to the direction and having a second length in a second direction orthogonal to both the magnetization direction and the first direction.

  In the present invention, it is possible to suppress an increase in the types of components constituting the rotating electrical machine and the rotor.

It is sectional drawing of the rotary electric machine by 1st Embodiment of this invention. It is a top view which shows the stator and rotor of the rotary electric machine by 1st Embodiment of this invention. It is a top view which shows the 1st permanent magnet and 2nd permanent magnet for 1 magnetic pole of the rotary electric machine by 1st Embodiment of this invention. It is a perspective view of the permanent magnet which comprises the 1st permanent magnet and 2nd permanent magnet of the rotary electric machine by 1st Embodiment of this invention. FIG. 3 is a cross-sectional view taken along line 200-200 in FIG. 2. It is a top view which shows the 1st permanent magnet and 2nd permanent magnet for 1 magnetic pole of the rotary electric machine by 2nd Embodiment of this invention. It is a top view which shows the 1st permanent magnet and 2nd permanent magnet for 1 magnetic pole of the rotary electric machine by 3rd Embodiment of this invention. It is sectional drawing of the rotor core of the rotary electric machine by the 1st modification of 1st-3rd embodiment of this invention. It is sectional drawing of the rotor core of the rotary electric machine by the 2nd modification of 1st-3rd embodiment of this invention. It is a top view which shows the 1st permanent magnet and 2nd permanent magnet for 1 magnetic pole of the rotary electric machine by the modification of 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, with reference to FIGS. 1-4, the structure of the rotary electric machine 100 by 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the rotating electrical machine 100 includes a stator 1, a rotor 2, a fan 3, bearings 4 a and 4 b, a fan cover 5, brackets 6 a and 6 b, and a frame 7.

  The stator 1 and the rotor 2 are disposed inside the frame 7. Further, the stator 1 and the rotor 2 are disposed so as to face each other in the radial direction of the rotor 2. Brackets 6a and 6b are attached to both ends of the frame 7 in the axial direction. Bearings 4a and 4b made of ball bearings or the like are attached to the brackets 6a and 6b, respectively. The rotor 2 is provided with a shaft 22 to be described later so as to penetrate the rotor 2. The shaft 22 is supported by bearings 4a and 4b provided on the brackets 6a and 6b, respectively. The fan 3 is attached to one end of the shaft 22. A fan cover 5 is provided so as to cover the fan 3 and the bracket 6a. The fan cover 5 is provided with a plurality of through holes 5a for introducing outside air. Further, the bracket 6a is provided with a through hole 61a for discharging the outside air introduced from the through hole 5a of the fan cover 5 to the stator 1 and the rotor 2 side. The bracket 6b is provided with a plurality of through holes 61b for discharging the outside air introduced from the through holes 61a of the bracket 6a to which the heat of the stator 1 and the rotor 2 is transmitted.

  As shown in FIG. 2, the stator 1 includes a stator core 11 in which a plurality of slots 12 are formed, and a winding 13. The plurality of slots 12 are formed inside the stator core 11. In the first embodiment, 48 slots 12 are formed in the stator core 11. Stator core 11 is formed, for example, by laminating electromagnetic steel sheets. The winding 13 is wound between the slots 12. The winding 13 is wound by concentrated winding or distributed winding. Further, the portion of the stator core 11 between the slot 12 and the slot 12 constitutes a tooth portion 14. Further, the outer peripheral portion of the stator core 11 constitutes a yoke portion 15.

  The rotor 2 includes a rotor core 21, shafts 22, a plurality (eight in the first embodiment) of first permanent magnets 23a, and a plurality (eight in the first embodiment) of second permanent magnets 23b. It is configured. The rotor core 21 is formed by laminating electromagnetic steel plates, for example. The rotor core 21 may be, for example, a member obtained by bending a ferromagnetic member such as iron in a circular shape or a cylindrical ferromagnetic member. Further, the cylindrical ferromagnetic member may be made of a casting or the like. The shaft 22 is provided so as to penetrate the center of the rotor core 21.

  Further, one magnetic pole is constituted by one first permanent magnet 23a and one second permanent magnet 23b, and eight magnetic poles are constituted in the first embodiment. That is, the pole pitch angle θ (the angle formed by the two pole pitch lines OP) is approximately 45 degrees. The pole pitch line OP coincides with the q axis that is an axis in a direction electrically orthogonal to the axis (d axis) in the direction along the main magnetic flux.

  As shown in FIG. 3, through holes 21 a and 21 b for embedding the first permanent magnet 23 a and the second permanent magnet 23 b are provided in the vicinity of the outer peripheral portion of the rotor core 21. The through hole 21a is formed in a substantially rectangular shape (rectangular shape) when viewed from the axial direction (X direction), and has a long side having a length of L1 and a short side having a length of L2. The through hole 21b is formed in a substantially rectangular shape (rectangular shape) when viewed from the axial direction (X direction), and has a long side having a length of L3 and a short side having a length of L2.

  Further, the first permanent magnet 23a and the second permanent magnet 23b are embedded in the through holes 21a and 21b of the rotor core 21, respectively. The first permanent magnet 23a is formed in a substantially rectangular shape (rectangular shape) when viewed from the axial direction (X direction), similarly to the through hole 21a, and the long sides 231a and L2 having the length L1. And a short side 232a having a thickness. Similarly to the through hole 21b, the second permanent magnet 23b is formed in a substantially rectangular shape (rectangular shape) when viewed from the axial direction (X direction), and the long sides 231b and L2 having a length of L3. And a short side 232b having a thickness. Here, the length L1 of the long side 231a of the first permanent magnet 23a is larger than the length L3 of the long side 231b of the second permanent magnet 23b (L1> L3). On the other hand, the length of the short side 232a of the first permanent magnet 23a and the length of the short side 232b of the second permanent magnet 23b are L2 and are equal to each other. In the first embodiment, the ratio between the length L1 and the length L2 is 3: 2 (L1: L2 = 3: 2). The length L1 and the length L3 are examples of the “first length” and the “second length” in the present invention, respectively.

  Further, the first permanent magnet 23a and the second permanent magnet 23b are substantially V-shaped having a vertex on the rotation center O side of the rotor core 21 by the first permanent magnet 23a and the second permanent magnet 23b when viewed from the axial direction. It is arranged to be formed. Note that the center line OC that bisects the pole pitch angle θ substantially coincides with the d-axis that is the axis in the direction along the main magnetic flux. Moreover, it arrange | positions so that the magnetic pole surface inside the substantially V shape of the 1st permanent magnet 23a and the 2nd permanent magnet 23b arrange | positioned in a substantially V shape may become the same magnetic pole (FIG. 3 N pole). .

  Here, in the first embodiment, as shown in FIGS. 4 and 5, the first permanent magnet 23 a and the second permanent magnet 23 b are composed of the same permanent magnet 24 having a rectangular parallelepiped shape. The permanent magnet 24 having a rectangular parallelepiped shape has a long side 241 orthogonal to the magnetization direction (side orthogonal to the magnetization direction) as viewed from the magnetization direction, and has a length L1 and is orthogonal to the magnetization direction. The short side 242 (side orthogonal to both the magnetization direction and the long side 241 having the length of L1) has a length of L3. The direction in which the long side 241 of the permanent magnet 24 extends is an example of the “first direction” in the present invention. The direction in which the short side 242 of the permanent magnet 24 extends is an example of the “second direction” in the present invention. The permanent magnet 24 has a thickness (length) of L2 in a direction along the magnetization direction. The outer surface of the permanent magnet 24 is covered with a non-conductive member such as epoxy resin. Thereby, it is suppressed that the permanent magnet 24 which consists of neodymium etc. rusts.

  In the first embodiment, as shown in FIG. 5, the first permanent magnet 23 a includes a plurality (9 in the first embodiment) of permanent magnets 24 and a short side 242 having a length L <b> 3 in the axial direction (X (Direction) and are laminated. The second permanent magnet 23b is configured by laminating a plurality (six in the first embodiment) of permanent magnets 24 so that the long side 241 having the length L1 is along the axial direction (X direction). Yes. The ratio of the number of permanent magnets 24 constituting the first permanent magnet 23a (9) to the number of permanent magnets 24 constituting the second permanent magnet 23b (six) is the length of the permanent magnet 24. The length L1 of the side 241 and the length L3 of the short side 242 are configured to be equal to the ratio (L1: L3 = 3: 2). Thereby, the axial length (length L3 × 9) of the first permanent magnets 23a is equal to the axial length (length L1 × 6) of the second permanent magnets 23b.

  Further, the first permanent magnet 23a (second permanent magnet 23b) embeds the permanent magnets 24 in the through holes 21a (through holes 21b) of the rotor core 21 one by one along the X direction, thereby allowing the through holes 21a ( It is arranged in the through hole 21b). In addition, as described above, the outer surface of the permanent magnet 24 is covered with a non-conductive member (insulating member) such as an epoxy-based resin, and thus a plurality of permanent magnets stacked along the axial direction. The 24s are insulated from each other. Here, in 1st Embodiment, the side surface of the direction orthogonal to the axial direction of the permanent magnet 24 and the side surface of the through-hole 21a (through-hole 21b) are adhere | attached with an adhesive material. Thereby, the permanent magnet 24 is fixed to the rotor core 21.

  In the first embodiment, the length L4 of the rotor core 21 in the axial direction (X direction) is substantially equal to the common multiple of the length L1 of the long side 241 and the length L3 of the short side 242 of the permanent magnet 24. It is configured. Specifically, the length L4 in the axial direction (X direction) of the rotor core 21 is approximately six times the length L1 of the long side 241 of the permanent magnet 24, and the length of the short side 242 of the permanent magnet 24. It is configured to be approximately 9 times L3. Thus, the axial length of the first permanent magnet 23a (length L3 × 9), the axial length of the second permanent magnet 23b (length L1 × 6), and the axial direction of the rotor core 21 ( The length L4 in the (X direction) is substantially equal.

  In the first embodiment, as described above, the first permanent magnet 23a and the second permanent magnet 23b having different lengths in the direction orthogonal to the magnetization direction when viewed from the axial direction (X direction) are separated from the magnetization direction. The first permanent magnet is constituted by the same permanent magnet 24 having the long side 241 orthogonal to the magnetization direction and having the length L1 and the short side 242 having the length L3 as viewed from the magnetization direction. Unlike the case where 23a and the 2nd permanent magnet 23b are comprised from the permanent magnet from which the dimensional relationship of L1 and L3 mutually differs, it can suppress that the kind of components which comprise the rotary electric machine 100 increases.

  In the first embodiment, as described above, the permanent magnet 24 constituting the first permanent magnet 23a and the second permanent magnet 23b is configured such that the long side 241 has the length L1 and the short side as viewed from the magnetization direction. 242 is composed of a substantially rectangular parallelepiped permanent magnet 24 having a length L3. Thereby, since the permanent magnet 24 can be laminated | stacked easily, the 1st permanent magnet 23a and the 2nd permanent magnet 23b can be comprised easily.

  In the first embodiment, as described above, the first permanent magnets 23a are embedded in the rotor core 21 in a state where the short sides 242 having the length L3 are stacked so as to be along the axial direction (9 A plurality of (six) permanent magnets 24, and the second permanent magnets 23b are embedded in the rotor core 21 in such a manner that the long sides 241 having the length L1 are stacked along the axial direction. A permanent magnet 24 is used. The eddy current generated in the permanent magnet increases with the volume of the permanent magnet. Therefore, by configuring the first permanent magnet 23a and the second permanent magnet 23b from the plurality of permanent magnets 24 as described above, the eddy current is prevented from increasing as the volume of each permanent magnet decreases. Can do. In the case where each of the first permanent magnet 23a and the second permanent magnet 23b is composed of a single permanent magnet, the axial length of the single permanent magnet constituting the first permanent magnet 23a and the second permanent magnet 23b. Therefore, when the permanent magnet is embedded in the rotor core 21, the permanent magnet may be broken (broken). On the other hand, since the first permanent magnet 23a and the second permanent magnet 23b are composed of a plurality of permanent magnets 24, relatively small permanent magnets 24 can be embedded one by one in the rotor core 21, so that the permanent magnets 24 are damaged. Can be suppressed.

  In the first embodiment, as described above, the number of the plurality of permanent magnets 24 (9 pieces) constituting the first permanent magnet 23a and the number of the permanent magnets 24 that are stacked along the axial direction and the number of the permanent magnets 24 are stacked along the axial direction. The ratio of the number (6) of the plurality of permanent magnets 24 constituting the two permanent magnets 23b is the ratio of the length L1 of the long side 241 and the length L3 of the short side 242 (3: 2). To be equal to Thereby, even when laminating along different sides of the same permanent magnet 24, the length in the direction along the axial direction of the first permanent magnet 23a and the length in the direction along the axial direction of the second permanent magnet 23b. Can be made equal.

  Moreover, in 1st Embodiment, as mentioned above, it comprises so that the surface of the permanent magnet 24 which comprises the 1st permanent magnet 23a and the 2nd permanent magnet 23b may be covered with a nonelectroconductive member. Thereby, even when a plurality of permanent magnets 24 are stacked, an increase in eddy current due to the electrical connection between the plurality of permanent magnets 24 can be suppressed.

  In the first embodiment, as described above, the axial length L4 of the rotor core 21 is substantially equal to the common multiple of the length L1 of the long side 241 and the length L3 of the short side 242 of the permanent magnet 24. Configure as follows. Thereby, the axial length of the rotor core 21 and the axial lengths of the first permanent magnet 23a and the second permanent magnet 23b can be easily made substantially equal.

  In the first embodiment, as described above, the first permanent magnet 23a having the length L1 in the direction orthogonal to the magnetization direction and the length L3 different from the length L1 in the direction orthogonal to the magnetization direction. The second permanent magnet 23b having a shape is arranged so as to form a substantially V shape having a vertex on the rotation center O side of the rotor core 21 by the first permanent magnet 23a and the second permanent magnet 23b when viewed from the axial direction. Then, one magnetic pole is formed by the first permanent magnet 23a and the second permanent magnet 23b arranged so as to form a substantially V-shape. Thereby, since one magnetic pole is comprised by two permanent magnets (1st permanent magnet 23a and 2nd permanent magnet 23b), from the 1st permanent magnet 23a and 2nd permanent magnet 23b side to the outer peripheral part side of the rotor core 21 The magnetic flux generated toward the head can be increased.

(Second Embodiment)
Next, the rotating electrical machine 101 of the second embodiment will be described with reference to FIG. In the second embodiment, as viewed from the axial direction, unlike the first embodiment in which one magnetic pole is constituted by two first permanent magnets 23a and second permanent magnets 23b, one magnetic pole has one first magnetic pole. It is comprised by the 1 permanent magnet 23a and the 2nd 2nd permanent magnet 23b (a total of 3 permanent magnets).

  As shown in FIG. 6, in the rotating electrical machine 101 according to the second embodiment, when viewed from the axial direction, one first permanent magnet 23a has a long side 231a having a length L1 of the first permanent magnet 23a. And are arranged so as to be substantially orthogonal. The two second permanent magnets 23b are arranged such that the long side 231b having the length L3 of the second permanent magnet 23b is along the pole pitch line OP. Then, as viewed from the axial direction, the first permanent magnet 23a and the second permanent magnet 23a and the second permanent magnet 23b form a substantially U shape having a vertex on the rotation center O side of the rotor core 21. A permanent magnet 23b is disposed. As in the first embodiment, the first permanent magnet 23a has a plurality of (nine) permanent magnets 24 and a short side 242 having a length L3 in the axial direction (X direction) as shown in FIG. It is comprised by laminating | stacking so that. Similarly to the first embodiment, the second permanent magnet 23b is formed by laminating a plurality (six) of permanent magnets 24 so that the long side 241 having the length L1 is along the axial direction (X direction). It is comprised by.

  In addition, the other structure of 2nd Embodiment is the same as that of the said 1st Embodiment.

  In the second embodiment, as described above, when viewed from the axial direction, the first permanent magnet 23a and the second permanent magnet 23b form a substantially U shape having a vertex on the rotation center O side of the rotor core 21. The first permanent magnet 23a and the second permanent magnet 23b are arranged, and one magnetic pole is formed by the first permanent magnet 23a and the second permanent magnet 23b arranged so as to form a substantially U shape. As a result, one magnetic pole is constituted by three permanent magnets (one first permanent magnet 23a and two second permanent magnets 23b), so that the rotor core from the first permanent magnet 23a and the second permanent magnet 23b side is provided. The magnetic flux generated toward the outer peripheral side of 21 can be further increased.

  The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

(Third embodiment)
Next, the rotating electrical machine 102 of the third embodiment will be described with reference to FIG. In the third embodiment, unlike the first embodiment in which one magnetic pole is constituted by two first permanent magnets 23a and second permanent magnets 23b when viewed from the axial direction, the first magnetic pole has two first magnetic poles. It is comprised by the 1 permanent magnet 23a and the 2nd 2nd permanent magnet 23b (a total of 4 permanent magnets).

  As shown in FIG. 7, in the rotating electrical machine 102 of the seventh embodiment, the two first permanent magnets 23a are arranged in a direction in which the long side 231a having the length L1 of the first permanent magnet 23a intersects the center line OC. It is arranged along. Then, when viewed from the axial direction, the two first permanent magnets 23a are arranged so that the two first permanent magnets 23a form a substantially V shape having a vertex on the rotation center O side of the rotor core 21. Yes. Further, the two second permanent magnets 23b are arranged so that the long side 231b having the length L3 of the second permanent magnet 23b is along the direction intersecting the center line OC. Then, when viewed from the axial direction, the two second permanent magnets 23b are arranged so that the two second permanent magnets 23b form a substantially V shape having a vertex on the rotation center O side of the rotor core 21. Yes. Further, the two second permanent magnets 23b are arranged on the outer peripheral side of the rotor core 21 with respect to the two first permanent magnets 23a. Thus, by forming two substantially V-shapes by the two first permanent magnets 23a and the two second permanent magnets 23b, the q-axis magnetic flux (solid arrow in FIG. 7) Since it becomes easy to pass between two substantially V-shaped permanent magnets, the reluctance torque of the rotating electrical machine 102 can be increased. Further, since the d-axis magnetic flux (dotted arrow in FIG. 7) passes through the two permanent magnets (first permanent magnet 23a and second permanent magnet 23b), the d-axis magnetic flux can be reduced. As in the first embodiment, the first permanent magnet 23a has a plurality of (nine) permanent magnets 24 and a short side 242 having a length L3 in the axial direction (X direction) as shown in FIG. It is comprised by laminating | stacking so that. Similarly to the first embodiment, the second permanent magnet 23b is formed by laminating a plurality (six) of permanent magnets 24 so that the long side 241 having the length L1 is along the axial direction (X direction). It is comprised by.

  In the third embodiment, as described above, when viewed from the axial direction, the two first permanent magnets 23a and the two second permanent magnets 23b form the first substantially V-shape. The permanent magnet 23a and the second permanent magnet 23b are arranged, and one magnetic pole is formed by the first permanent magnet 23a and the second permanent magnet 23b arranged so as to form a substantially V-shape. As a result, one magnetic pole is constituted by four permanent magnets (two first permanent magnets 23a and two second permanent magnets 23b), so that the rotor core from the first permanent magnet 23a and the second permanent magnet 23b side. The magnetic flux generated toward the outer peripheral side of 21 can be further increased.

  The remaining effects of the third embodiment are similar to those of the aforementioned first embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first to third embodiments, the example in which the ratio of the long side length to the short side length of the permanent magnet is 3: 2 is shown, but the present invention is not limited to this. I can't. In the present invention, when the long side length and the short side length of the permanent magnet are different, the ratio of the long side length to the short side length of the permanent magnet is set to a ratio other than 3: 2. May be.

  Moreover, in the said 1st-3rd embodiment, although the 1st permanent magnet and the 2nd permanent magnet showed the example comprised from the same permanent magnet which has a rectangular parallelepiped shape, this invention is not limited to this. In the present invention, the permanent magnets constituting the first permanent magnet and the second permanent magnet may be formed in a shape other than a rectangular parallelepiped shape (for example, a polygonal shape with chamfered corners).

  In the first to third embodiments, the axial length L4 of the rotor core is configured to be approximately equal to the common multiple of the long side length L1 and the short side length L3 of the permanent magnet. However, the present invention is not limited to this. For example, as in the first modification of the first to third embodiments shown in FIG. 8, the axial length L5 of the rotor core 21c is set to the length L1 of the long side 241 and the length of the short side 242 of the permanent magnet 24. You may make it become larger than the common multiple (L4) with L3.

  Moreover, in the said 1st-3rd embodiment, ratio of the number (9 pieces) of several permanent magnets which comprise a 1st permanent magnet, and the number (6 pieces) of several permanent magnets which comprise a 2nd permanent magnet. Although the example which comprises this to become equal to ratio (3: 2) of the long side length L1 and short side length L3 of a permanent magnet was shown, this invention is not limited to this. For example, as in the second modification of the first to third embodiments shown in FIG. 9, the number of the plurality of permanent magnets 24 (eight) constituting the first permanent magnet 25a and the second permanent magnet 25b are constituted. The ratio of the number (3) of the plurality of permanent magnets 24 is configured not to be equal to the ratio (3: 2) of the length L1 of the long side 241 and the length L3 of the short side 242 of the permanent magnet 24. May be. That is, the length L6 in the axial direction (X direction) of the first permanent magnet 25a may be different from the length L7 in the axial direction (X direction) of the second permanent magnet 25b.

  Moreover, in the said 1st-3rd embodiment, the side surface of the direction orthogonal to the axial direction of a permanent magnet and the through-hole of a motor core do not adhere | attach the interface of several permanent magnets laminated | stacked along an axial direction. Although the example which fixes a permanent magnet to a rotor core by adhere | attaching the side surface of this with an adhesive material was shown, this invention is not limited to this. In the present invention, in addition to the side surface in the direction orthogonal to the axial direction of the permanent magnet, the interface between the plurality of permanent magnets laminated along the axial direction may be bonded with an adhesive, or other than the adhesive The permanent magnet may be fixed to the rotor core by a method.

  Moreover, although the said 1st-3rd embodiment demonstrated the example in which the fan 3 and the fan cover 5 were provided in the rotary electric machine 100, this invention is not limited to this. For example, instead of the fan 3 and the fan cover 5, an encoder or an encoder cover may be provided. Moreover, although the example in which the through hole 61a is provided in the bracket 6a and the through hole 61b is provided in the bracket 6b has been described, the through hole 61a of the bracket 6a and the through hole 61b of the bracket 6b may not be provided. .

  Moreover, although the magnet shape and the through-hole for embedding it demonstrated the example which becomes the same shape in the said 1st-3rd embodiment, this invention is not limited to this. In the present invention, the magnet shape and the through-hole for embedding it may not be the same shape. For example, a rectangular magnet may be embedded in the trapezoidal through hole.

  In the second embodiment, an example is shown in which one magnetic pole is formed by one first permanent magnet and two second permanent magnets arranged so as to form a substantially U shape. The present invention is not limited to this. For example, like the modification of 2nd Embodiment shown in FIG. 10, you may arrange | position so that the 2nd permanent magnet 23b may straddle pole pitch line OP. That is, the second permanent magnets 23b arranged so as to straddle the pole pitch line OP may be configured to be used in common by adjacent magnetic poles.

2 rotor 21 rotor core 21a, 21b through hole 23a, 25a first permanent magnet 23b, 25b second permanent magnet 24 permanent magnet 241 long side 242 short side 100, 101, 102 rotating electrical machine

Claims (9)

Rotor core,
A first permanent magnet embedded in the rotor core and having a first length in a direction orthogonal to the magnetization direction when viewed from the axial direction;
A second permanent magnet embedded in the rotor core and having a second length different from the first length in a direction orthogonal to the magnetization direction when viewed from the axial direction;
The first permanent magnet and the second permanent magnet have the first length in a first direction orthogonal to the magnetization direction, and a second orthogonal to both the magnetization direction and the first direction. A rotating electrical machine made of the same permanent magnet having the second length in the direction of.   The permanent magnets constituting the first permanent magnet and the second permanent magnet are formed in a substantially rectangular parallelepiped shape, and a length perpendicular to the magnetization direction of the substantially rectangular parallelepiped permanent magnet is viewed from the magnetization direction. The side has the first length, and the short side perpendicular to the magnetization direction of the substantially rectangular parallelepiped permanent magnet as viewed from the magnetization direction has the second length. The rotating electrical machine according to claim 1. The first permanent magnet is composed of a plurality of the permanent magnets embedded in the rotor core in a state where the short sides having the second length are laminated so as to be along the axial direction,
The said 2nd permanent magnet consists of the said several permanent magnet embedded in the said rotor core in the state laminated | stacked so that the long side which has said 1st length may follow an axial direction. Rotating electric machine.   The number of the plurality of permanent magnets stacked along the axial direction and constituting the first permanent magnet, and the number of the plurality of permanent magnets stacked along the axial direction and constituting the second permanent magnet, The rotating electrical machine according to claim 3, wherein the ratio is configured to be equal to a ratio between the first length and the second length of the permanent magnet.   Interfaces between the plurality of permanent magnets stacked along the axial direction are not bonded, and side surfaces in a direction intersecting the axial direction of the plurality of permanent magnets are provided on the rotor core and the plurality of permanent magnets The rotating electrical machine according to claim 3 or 4, wherein the rotating electrical machine is bonded to a side surface of the through hole for embedding the wire.   The rotating electrical machine according to any one of claims 1 to 5, wherein surfaces of the permanent magnets constituting the first permanent magnet and the second permanent magnet are covered with a non-conductive member.   The length in the axial direction of the rotor core is configured to be substantially equal to a common multiple of the first length and the second length of the permanent magnet. The rotating electrical machine described. The first permanent magnet having the first length in a direction perpendicular to the magnetization direction and the second permanent magnet having the second length different from the first length in the direction orthogonal to the magnetization direction. The permanent magnet is arranged so as to form a substantially V shape or a substantially U shape having a vertex on the rotation center side of the rotor core by the first permanent magnet and the second permanent magnet when viewed from the axial direction. And
The magnetic pole according to claim 1, wherein one magnetic pole is formed by the first permanent magnet and the second permanent magnet arranged so as to form the substantially V shape or the substantially U shape. The rotating electrical machine according to the item. Rotor core,
A first permanent magnet embedded in the rotor core and having a first length in a direction orthogonal to the magnetization direction when viewed from the axial direction;
A second permanent magnet embedded in the rotor core and having a second length different from the first length in a direction orthogonal to the magnetization direction when viewed from the axial direction;
The first permanent magnet and the second permanent magnet have the first length in a first direction orthogonal to the magnetization direction, and a second orthogonal to both the magnetization direction and the first direction. A rotor composed of the same permanent magnet having the second length in the direction of.

Images