JP5494843B2 - Method for manufacturing permanent magnet rotating machine - Google Patents

Description

  The present invention relates to a method for manufacturing a permanent magnet rotating machine with reduced cogging torque.

  In a permanent magnet type rotating machine such as a motor, a kind of torque pulsation called cogging torque may occur. This cogging torque changes with the change in the rotation angle of the stator, as the magnetic flux density of the magnetic flux flowing between the rotor, which is the rotating part of the permanent magnet rotating machine, and the stator, which is the fixed part, changes. It is generated by doing. Therefore, such an increase in cogging torque causes a problem of deteriorating the rotation control performance of the permanent magnet type rotating machine, and a problem of vibration and noise.

  This cogging torque may be generated each time the rotor is rotated by an angle obtained by dividing the rotation angle of 360 ° by the least common multiple of the number of poles of the permanent magnet and the number of slots of the stator. Such a component of cogging torque generated at a period for each rotation angle is called a “theoretical order component”.

  For example, in a 6-pole 9-slot type permanent magnet rotating machine, the rotor has a rotation angle of 360 ° divided by the number of poles 6 and the least common multiple 18 of the number of slots 9 of 20 ° (= 360 ° ÷ 18). Each time it is rotated, a cogging torque of a theoretical order component is generated. Further, in the 8-pole 12-slot type permanent magnet rotating machine, the rotor has a rotation angle of 360 ° divided by the number of poles 8 and the least common multiple 24 of the number of slots 12 of 15 ° (= 360 ° ÷ 24). Each time it is rotated, a cogging torque of a theoretical order component is generated.

  Further, when there is variation in the stator, as shown in Non-Patent Document 1, the cogging torque is generated every time the rotor is rotated by an angle obtained by dividing the rotation angle of 360 degrees by the number of poles of the permanent magnet. May also occur. A component of cogging torque generated at such a period for each rotation angle is called a “pole component”.

  For example, in a 6-pole 9-slot type permanent magnet type rotating machine, the rotor is rotated by 60 ° (= 360 ° ÷ 6), which is obtained by dividing a rotation angle of 360 ° by 6 poles every time the rotor is rotated. As a result, a cogging torque of the pole number component is generated. Further, in the 8-pole 12-slot type permanent magnet rotating machine, the number of poles is increased each time the rotor is rotated by 45 ° (= 360 ° ÷ 8) obtained by dividing the rotation angle of 360 ° by the number of poles 8. The cogging torque of the component is generated.

  In the permanent magnet type rotating machine manufactured for the purpose of reducing the cogging torque of the pole number component as described above, as in Patent Document 1, a fixed phase constituting 1 phase to N-1 phase among N energized phases is used. Some of the teeth on the child side are formed so as to be different from the shapes of the plurality of teeth constituting the other energized phases.

  Moreover, a split core may be used for a stator like patent document 1, and this split core is comprised from the several core piece. Each of the plurality of core pieces constitutes one tooth of the stator, and by arranging such a plurality of core pieces in an annular shape, a divided core having a plurality of teeth is formed. .

  This split core may be manufactured by combining various core pieces to cope with increased production. In such a case, in particular, it is designed in the same shape as each other, but the shape is caused by the difference between the two types of manufacturing conditions. Due to the difference, it may be necessary to manufacture a split core by combining two kinds of core pieces having different magnetic resistances.

JP 2006-311738 A

Yasuhiro Ogashi, 4 others, "Conditions for generating cogging torque due to PM motor stator manufacturing error", IEEJ Transactions B, November 1, 2006, Vol. 126, No. 8, pp. 1140- 1150 pages

  However, in the permanent magnet type rotating machine as in Patent Document 1, by providing a difference between the shape of the tooth whose shape has been changed and the shape of the other tooth, the saturation magnetic flux density of the magnetic flux flowing between the phases will be different. The torque control performance of the permanent magnet rotating machine may be affected.

  In addition, when a split core is manufactured by combining two core pieces having different magnetoresistance due to a difference in shape due to a difference between two types of manufacturing conditions, the two core pieces are combined. Depending on the case, there is a possibility that the rotational performance of the permanent magnet rotating machine may vary, and there is a possibility that cogging torque of the pole number component may be generated.

  Accordingly, an object of the present invention is to reduce the variation in the rotation performance of the permanent magnet rotating machine and to reduce the cogging torque of the pole component in particular without affecting the torque control performance. It is to provide a method for manufacturing a machine.

  In order to solve the problem, the method of manufacturing the permanent magnet type rotating machine according to the first aspect of the present invention is designed to have the same shape as the rotor having the permanent magnet, but the difference between the two types of manufacturing conditions. A plurality of core pieces composed of two types of core pieces having different magnetic resistances due to a difference in shape due to the difference, a stator core configured by arranging the plurality of core pieces in an annular shape, a U phase, A pole of the permanent magnet, comprising: a three-phase winding composed of a V-phase and a W-phase; and a stator having the stator core in which each phase of the three-phase winding is wound around a separate core piece. The number of the core pieces is 2n, the N poles and the S poles are alternately arranged along the circumferential direction of the permanent magnet, the number of slots of the stator is 3n, and the U-phase winding is wound around the core piece 1 One A permanent magnet type in which one group of core pieces wound with a V-phase winding and one group of core pieces wound with the W-phase winding are arranged side by side, and the value of n is an integer of 2 or more. A method of manufacturing a rotating machine, wherein each time the rotor is rotated by an angle obtained by dividing a rotation angle of 360 ° by a least common multiple of the number of poles of the permanent magnet 2n and the number of slots of the stator 3n, Including the step of arranging the two kinds of core pieces in combination so that the magnetic flux density distribution of the magnetic flux flowing between the rotor and the stator is equal, and when the value of n is 4, The step of arranging two types of core pieces in combination includes the step of arranging one of the two types of core pieces in a row and arranging the other of the two types of core pieces in a row of nine. Including Therefore, when the two types of core pieces having different magnetic resistances are used, for example, when there is a variation between the two core pieces due to simultaneous production of two core pieces using a two-piece press die, the U Magnetic flux density distribution of magnetic flux flowing between the n core pieces of the phase and the permanent magnet, magnetic flux density distribution of magnetic flux flowing between the n core pieces of the V phase and the permanent magnet, and n of the W phase It is possible to make it difficult for variations to occur between the core piece and the magnetic flux density distribution of the magnetic flux flowing between the permanent magnets. Therefore, the variation of the saturation magnetic flux density flowing between the phases is reduced, and the cogging torque of the pole number component can be reduced without affecting the torque control performance of the permanent magnet type rotating machine.

  The manufacturing method of the permanent magnet type rotating machine according to the second aspect of the present invention is designed to have the same shape as the rotor having the permanent magnet, but due to the difference in shape due to the difference between the two types of manufacturing conditions. A plurality of core pieces composed of two types of core pieces having different magnetic resistances, a stator core formed by arranging the plurality of core pieces in an annular shape, and a U phase, a V phase, and a W phase A three-phase winding, and a stator having the stator core in which each phase of the three-phase winding is wound around a separate core piece, and the number of poles of the permanent magnet is 2n, The N-phase and S-poles are alternately arranged along the circumferential direction of the permanent magnet, the number of slots of the stator is 3n, and one of the core pieces around which the U-phase winding is wound, the V-phase winding Winding This is a method for manufacturing a permanent magnet rotating machine in which n groups of one core piece and one core piece wound with the W-phase winding are arranged side by side and n is an integer of 2 or more. Each time the rotor is rotated by an angle obtained by dividing a rotation angle of 360 ° by the least common multiple of the number of poles of the permanent magnet 2n and the number of slots of the stator 3n, the rotor and the stator Including the step of arranging the two types of core pieces in combination so that the magnetic flux density distribution of the magnetic flux flowing between them is equal, and when the value of n is 4, the two types of core pieces are arranged in combination Performing one of the two types of core pieces, two of the core pieces wound with the four U-phase windings, two of the core pieces wound with the four V-phase windings, and the front of the four core pieces. Including a step of arranging the core pieces wound with the W-phase winding in combination. Therefore, in the aspect of the 8-phase 12-slot type permanent magnet rotating machine, the ratio of the number of the two types of core pieces distributed to the U phase, the V phase, and the W phase on the stator side becomes equal. Therefore, the production efficiency of parts used for manufacturing the permanent magnet rotating machine can be improved, and the cogging torque of the pole number component can be more reliably reduced.

  The manufacturing method of the permanent magnet type rotating machine according to the third aspect of the present invention is designed to have the same shape as the rotor having the permanent magnet, but due to the difference in shape due to the difference between the two types of manufacturing conditions. A plurality of core pieces composed of two types of core pieces having different magnetic resistances, a stator core formed by arranging the plurality of core pieces in an annular shape, and a U phase, a V phase, and a W phase A three-phase winding, and a stator having the stator core in which each phase of the three-phase winding is wound around a separate core piece, and the number of poles of the permanent magnet is 2n, The N-phase and S-poles are alternately arranged along the circumferential direction of the permanent magnet, the number of slots of the stator is 3n, and one of the core pieces around which the U-phase winding is wound, the V-phase winding Winding This is a method for manufacturing a permanent magnet rotating machine in which n groups of one core piece and one core piece wound with the W-phase winding are arranged side by side and n is an integer of 2 or more. Each time the rotor is rotated by an angle obtained by dividing a rotation angle of 360 ° by the least common multiple of the number of poles of the permanent magnet 2n and the number of slots of the stator 3n, the rotor and the stator Including the step of arranging the two types of core pieces in combination so that the magnetic flux density distribution of the magnetic flux flowing between them is equal, and when the value of n is 4, the two types of core pieces are arranged in combination The step of performing includes the step of arranging one of the two types of core pieces in a row and arranging the other of the two types of core pieces in a row of six. Therefore, in the aspect of the 8-phase 12-slot type permanent magnet rotating machine, the ratio of the number of the two types of core pieces distributed to the U phase, the V phase, and the W phase on the stator side becomes equal. Therefore, the production efficiency of parts used for manufacturing the permanent magnet rotating machine can be improved, and the cogging torque of the pole number component can be more reliably reduced.

  The manufacturing method of the permanent magnet type rotating machine according to the fourth aspect of the present invention is designed to have the same shape as the rotor having the permanent magnet, but due to the difference in shape due to the difference between the two types of manufacturing conditions. A plurality of core pieces composed of two types of core pieces having different magnetic resistances, a stator core formed by arranging the plurality of core pieces in an annular shape, and a U phase, a V phase, and a W phase A three-phase winding, and a stator having the stator core in which each phase of the three-phase winding is wound around a separate core piece, and the number of poles of the permanent magnet is 2n, The N-phase and S-poles are alternately arranged along the circumferential direction of the permanent magnet, the number of slots of the stator is 3n, and one of the core pieces around which the U-phase winding is wound, the V-phase winding Winding This is a method for manufacturing a permanent magnet rotating machine in which n groups of one core piece and one core piece wound with the W-phase winding are arranged side by side and n is an integer of 2 or more. Each time the rotor is rotated by an angle obtained by dividing a rotation angle of 360 ° by the least common multiple of the number of poles of the permanent magnet 2n and the number of slots of the stator 3n, the rotor and the stator Including the step of arranging the two types of core pieces in combination so that the magnetic flux density distribution of the magnetic flux flowing between them is equal, and when the value of n is 4, the two types of core pieces are arranged in combination The step of performing includes the step of alternately arranging one of the two types of core pieces and the other of the two types of core pieces one by one. Therefore, in the aspect of the 8-phase 12-slot type permanent magnet rotating machine, the ratio of the number of the two types of core pieces distributed to the U phase, the V phase, and the W phase on the stator side becomes equal. Therefore, the production efficiency of parts used for manufacturing the permanent magnet rotating machine can be improved, and the cogging torque of the pole number component can be more reliably reduced.

  The manufacturing method of the permanent magnet type rotating machine according to the fifth aspect of the present invention is designed to have the same shape as the rotor having the permanent magnet, but due to the difference in shape due to the difference between the two types of manufacturing conditions. A plurality of core pieces composed of two types of core pieces having different magnetic resistances, a stator core formed by arranging the plurality of core pieces in an annular shape, and a U phase, a V phase, and a W phase A three-phase winding, and a stator having the stator core in which each phase of the three-phase winding is wound around a separate core piece, and the number of poles of the permanent magnet is 2n, The N-phase and S-poles are alternately arranged along the circumferential direction of the permanent magnet, the number of slots of the stator is 3n, and one of the core pieces around which the U-phase winding is wound, the V-phase winding Winding This is a method for manufacturing a permanent magnet rotating machine in which n groups of one core piece and one core piece wound with the W-phase winding are arranged side by side and n is an integer of 2 or more. Each time the rotor is rotated by an angle obtained by dividing a rotation angle of 360 ° by the least common multiple of the number of poles of the permanent magnet 2n and the number of slots of the stator 3n, the rotor and the stator Including the step of arranging the two types of core pieces in combination so that the magnetic flux density distribution of the magnetic flux flowing between them is equal, and when the value of n is 4, the two types of core pieces are arranged in combination The step of alternately arranging a group in which one of the two types of core pieces is arranged in a row and a group in which the other of the two types of core pieces is arranged in a row of three. Includes steps. Therefore, in the aspect of the 8-phase 12-slot type permanent magnet rotating machine, the ratio of the number of the two types of core pieces distributed to the U phase, the V phase, and the W phase on the stator side becomes equal. Therefore, the production efficiency of parts used for manufacturing the permanent magnet rotating machine can be improved, and the cogging torque of the pole number component can be more reliably reduced.

  The manufacturing method of the permanent magnet type rotating machine according to the sixth aspect of the present invention is the same as that of the rotor having the permanent magnet, but the shape is different due to the difference between the two types of manufacturing conditions. A plurality of core pieces composed of two types of core pieces having different magnetic resistances, a stator core formed by arranging the plurality of core pieces in an annular shape, and a U phase, a V phase, and a W phase A three-phase winding, and a stator having the stator core in which each phase of the three-phase winding is wound around a separate core piece, and the number of poles of the permanent magnet is 2n, The N-phase and S-poles are alternately arranged along the circumferential direction of the permanent magnet, the number of slots of the stator is 3n, and one of the core pieces around which the U-phase winding is wound, the V-phase winding Winding This is a method for manufacturing a permanent magnet rotating machine in which n groups of one core piece and one core piece wound with the W-phase winding are arranged side by side and n is an integer of 2 or more. Each time the rotor is rotated by an angle obtained by dividing a rotation angle of 360 ° by the least common multiple of the number of poles of the permanent magnet 2n and the number of slots of the stator 3n, the rotor and the stator Including the step of arranging the two types of core pieces in combination so that the magnetic flux density distribution of the magnetic flux flowing between them is equal, and when the value of n is 3, the two types of core pieces are arranged in combination Performing one of the two types of core pieces, one of the core pieces wound with the three U-phase windings, one of the core pieces wound with the three V-phase windings, and the front of the three core pieces. The step of combining and arranging so as to be one of the core pieces wound with the W-phase winding is included. Therefore, in the aspect of the 8-phase 12-slot type permanent magnet rotating machine, the ratio of the number of the two types of core pieces distributed to the U phase, the V phase, and the W phase on the stator side becomes equal. Therefore, the production efficiency of parts used for manufacturing the permanent magnet rotating machine can be improved, and the cogging torque of the pole number component can be more reliably reduced.

  The manufacturing method of the permanent magnet type rotating machine according to the seventh aspect of the present invention is designed to have the same shape as the rotor having the permanent magnet, but due to the difference in shape due to the difference between the two types of manufacturing conditions. A plurality of core pieces composed of two types of core pieces having different magnetic resistances, a stator core formed by arranging the plurality of core pieces in an annular shape, and a U phase, a V phase, and a W phase A three-phase winding, and a stator having the stator core in which each phase of the three-phase winding is wound around a separate core piece, and the number of poles of the permanent magnet is 2n, The N-phase and S-poles are alternately arranged along the circumferential direction of the permanent magnet, the number of slots of the stator is 3n, and one of the core pieces around which the U-phase winding is wound, the V-phase winding Winding This is a method for manufacturing a permanent magnet rotating machine in which n groups of one core piece and one core piece wound with the W-phase winding are arranged side by side and n is an integer of 2 or more. Each time the rotor is rotated by an angle obtained by dividing a rotation angle of 360 ° by the least common multiple of the number of poles of the permanent magnet 2n and the number of slots of the stator 3n, the rotor and the stator Including the step of arranging the two types of core pieces in combination so that the magnetic flux density distribution of the magnetic flux flowing between them is equal, and when the value of n is 3, the two types of core pieces are arranged in combination The step of performing includes the step of arranging one of the two types of core pieces in a row and arranging the other of the two types of core pieces in a row of six. Therefore, in a mode in which the number of core pieces is reduced as in the 6-phase 9-slot type permanent magnet rotating machine, the cogging torque of the pole number component can be reliably reduced while reducing the cost of the permanent magnet rotating machine.

  According to the method for manufacturing a permanent magnet type rotating machine according to the present invention, it is possible to reduce variation in rotational performance of the permanent magnet rotating machine, and particularly reduce cogging torque of pole components without affecting torque control performance. Can do.

It is the schematic which shows the rotor and stator of the permanent-magnet-type rotary machine in 1st Embodiment of this invention. It is the schematic which shows the state which rotated the rotor of FIG. 1 15 degree counterclockwise. It is the schematic which shows the rotor and stator of the permanent-magnet-type rotary machine in 2nd Embodiment of this invention. It is the schematic which shows the rotor and stator of the permanent-magnet-type rotary machine in the 1st modification of 2nd Embodiment of this invention. It is the schematic which shows the rotor and stator of a permanent magnet type rotary machine in the 2nd modification of 2nd Embodiment of this invention. It is the schematic which shows the rotor and stator of the permanent-magnet-type rotary machine in 3rd Embodiment of this invention. It is a graph showing the vibration at the time of rotation of a permanent magnet type rotary machine. It is the schematic which shows the rotor and stator of the permanent-magnet-type rotary machine of a comparative example. It is the schematic which shows the state which rotated the rotor of FIG. 8 15 degree counterclockwise.

  Embodiments of the present invention will be described below.

[First Embodiment]
A first embodiment of the present invention will be described below. FIG. 1 is a schematic diagram showing a rotor 2 and a stator 3 of a permanent magnet rotating machine (hereinafter referred to as a motor) 1 according to a first embodiment of the present invention.

  The motor 1 according to the first embodiment of the present invention is an 8-pole 12-slot type, and includes a rotor 2 and a stator 3. The rotor 2 includes a permanent magnet 2 a formed in a substantially ring shape, and the permanent magnet 2 a is disposed on the outer periphery of the rotor 2. In this permanent magnet 2a, N poles and S poles are alternately arranged along the circumferential direction of the rotor 2, and the number of poles of the permanent magnet 2a is eight. That is, the permanent magnet 2a includes four N poles (N1, N2, N3, and N4) and four S poles (S1, S2, S3, and S4). Two N poles and four S poles are arranged in the order of N1 pole, S1 pole, N2 pole, S2 pole, N3 pole, S3 pole, N4 pole, and S4 pole in the counterclockwise direction indicated by arrow M. . The rotor 2 is configured to be rotatable around an axis passing through the center of the outer circumference of the ring-shaped permanent magnet 2a.

  The stator 3 includes a stator core 4 and a three-phase winding composed of a U-phase winding, a V-phase winding, and a W-phase winding. The stator core 4 includes a yoke formed in a ring shape and 12 teeth formed so as to protrude from the yoke toward the center of the stator core 4. Furthermore, the stator core 4 is a split core and is composed of 12 core pieces. One core piece is configured to have one tooth.

  The twelve core pieces are arranged in an annular shape along the periphery of the rotor 2. Further, the twelve core pieces are composed of two types of three first core pieces 4a and nine second core pieces 4b indicated by oblique lines. The 1st core piece 4a and the 2nd core piece 4b are manufactured by laminating | stacking each, after simultaneously punching out an electromagnetic steel plate with the press die for two pieces. Therefore, the shape of the first core piece 4a and the shape of the second core piece 4b are different from each other depending on the shape variation of the stage for manufacturing each of the two-piece press dies.

  These three first core pieces 4a are combined and arranged so as to be continuously arranged, and nine second core pieces 4b are combined and arranged so as to be arranged continuously. Therefore, for the arrangement of the first core piece 4a and the second core piece 4b, a group of three first core pieces 4a and a group of nine second core pieces 4b are arranged so as to be continuously arranged, An annular stator core 4 is formed.

  The U-phase winding, the V-phase winding, and the W-phase winding are each wound around the teeth of separate core pieces. One group of core pieces wound with a U-phase winding, one core piece wound with a V-phase winding, and one core piece wound with a W-phase winding are arranged side by side in a row. Has been.

  The U1 phase is configured by winding the U-phase winding around the teeth of one first core piece 4a. Moreover, the U2 phase, U3 phase, and U4 phase are each comprised by the 2nd core piece 4b by winding a U-phase coil | winding around the teeth of three 2nd core pieces 4b.

  The V1 phase is configured by winding the V-phase winding around the teeth of one first core piece 4a. Further, the V2 phase, the V3 phase, and the V4 phase are configured by winding the V-phase winding around the teeth of the three second core pieces 4b.

  The W1 phase is configured by winding the W-phase winding around the teeth of one first core piece 4a. Further, the W2 phase, the W3 phase, and the W4 phase are configured by winding the W-phase winding around the teeth of the three second core pieces 4b. Therefore, the motor 1 has 12 slots.

  More specifically, the energized phases including four U phases, four V phases, and four W phases are arranged in the counterclockwise direction indicated by the arrow M in the U1, V1, W1, U2, V2, W2 phase, U3 phase, V3 phase, W3 phase, U4 phase, V4 phase, and W4 phase are arranged in this order.

  In such a motor 1, due to the difference between the shape of the first core piece 4a and the shape of the second core piece 4b, the magnetic resistance of the U1, V1 and W1 phases wound around the first core piece 4a A difference also occurs between the magnetic resistance of the U2 phase, V2 phase, W2 phase, U3 phase, V3 phase, W3 phase, U4 phase, V4 phase and W4 phase wound around the second core piece 4b. Become.

  Here, the positional relationship between the rotor 2 and the stator 3 during the rotating operation of the motor 1 will be described with reference to FIGS. 1 and 2. In FIG. 1, the center portions in the circumferential direction of the U1, U2, U3 and U4 phases are positioned so as to face the center portions in the circumferential direction of the N1, N2, N3 and N4 phases, respectively. .

  In such a state, a magnetic flux A (shown by a dotted line) flows between the U1 phase and the N1 pole at the tips of the U1, U2, U3, and U4 teeth, and between the U2 and N2 poles. The magnetic flux B having the same magnetic flux density flows between the U3 phase and the N3 pole and between the U4 phase and the N4 pole. Therefore, between the rotor 2 and the stator 3 of the motor 1, the magnetic flux A flows at one place, and the magnetic flux B having a different magnetic flux density from the magnetic flux A flows at three places.

  In the 8-pole 12-slot motor 1, each time the rotor 2 is rotated by a value of 15 ° (= 360 ° ÷ 24) obtained by dividing the rotation angle 360 ° by the least common multiple 24 of the number of poles 8 and the number of slots 12 In addition, a cogging torque of a theoretical order component is generated. FIG. 2 shows a state in which the rotor 2 is further rotated by 15 ° in the counterclockwise direction indicated by the arrow M from the state of FIG.

  In FIG. 2, the center portions in the circumferential direction of the W1, W2, W3, and W4 phases are positioned so as to face the center portions in the circumferential direction of the S1, S2, S3, and S4 poles, respectively. . In this state, a magnetic flux A (shown by a dotted line) flows between the W1 phase and the S1 pole at the tips of the W1, W2, W3 and W4 phase teeth, and between the W2 and S2 poles. The magnetic flux B having the same magnetic flux density flows between the W3 phase and the S3 pole and between the W4 phase and the S4 pole. That is, also between the rotor 2 and the stator 3 of the motor 1, the magnetic flux A flows at one place, and the magnetic flux B having a different magnetic flux density from the magnetic flux A flows at three places.

  The motor 1 continuously rotates by repeating the rotation of the rotor 2 every 15 °. Therefore, every time the rotor 2 is rotated by 15 °, that is, at the timing when the cogging torque of the theoretical order component of the motor 1 is generated, there is one magnetic flux A and three places between the rotor 2 and the stator 3. Thus, the magnetic flux B always flows with the same magnetic flux density distribution. Therefore, the cogging torque of the pole number component that is generated when the magnetic flux densities of the U phase, the V phase, and the W phase are different from each other is hardly generated.

  Therefore, in the motor 1 according to the first embodiment as described above, when it is necessary to use the first core piece 4a and the second core piece 4b having different magnetic resistances, the first core piece 4a is used in the two-cavity press die at the same time. When variation occurs between the first core piece 4a and the second core piece 4b due to manufacturing the core piece 4a and the second core piece 4b, between the core piece having four U phases and the permanent magnet 2a. Magnetic flux density distribution of flowing magnetic flux, magnetic flux density distribution of magnetic flux flowing between the core piece having four V phases and the permanent magnet 2a, and magnetic flux density distribution of magnetic flux flowing between the core piece having four W phases and the permanent magnet 2a And the variation can be reduced. Therefore, the variation in the saturation magnetic flux density of the magnetic flux flowing between the respective phases is also reduced, and the cogging torque of the pole number component can be reduced without affecting the torque control performance of the motor 1.

  The first embodiment of the invention has been described so far, but the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical idea of the present invention.

[Second Embodiment]
A second embodiment of the present invention will be described below. FIG. 3 is a schematic diagram showing the rotor 12 and the stator 13 of the motor 11 in the second embodiment of the present invention.

  The motor 11 is an 8-pole 12-slot type, and includes a rotor 12 and a stator 13. The rotor 12 includes a permanent magnet 12a configured similarly to the rotor 2 of the first embodiment.

  The stator 13 includes a stator core 14 and a three-phase winding composed of a U-phase winding, a V-phase winding, and a W-phase winding as in the first embodiment. Moreover, the yoke comprised similarly to 1st Embodiment and 12 teeth are provided.

  The stator core 4 is a split core and is composed of 12 core pieces. In the second embodiment, these twelve core pieces are composed of two types of six first core pieces 14a indicated by hatching and six second core pieces 14b. The shape of the first core piece 14a and the shape of the second core piece 14b are different from each other as in the first embodiment.

  As for the arrangement of the first core piece 14a and the second core piece 14b, the six first core pieces 14a are arranged in a continuous arrangement, and the six second core pieces 14b are arranged in a continuous manner. Are arranged in combination.

  The U-phase winding, the V-phase winding, and the W-phase winding are wound around the teeth of the separate core pieces, respectively, as in the first embodiment, and four U phases, four V phases, and four W phases are wound. An energized phase consisting of is formed. These energized phases are arranged in the counterclockwise direction indicated by the arrow M in the U1, V1, W1, U2, V2, W2, U3, V3, W3, U4, V4, and W4 phases. Arranged in order of phases.

  In the second embodiment, the U1 phase, V1 phase, W1 phase, U2 phase, V2 phase and W2 phase are formed in the first core piece 14a, and the U3 phase, V3 phase, W3 phase, U4 phase, V4 phase and W4 are formed. A phase is formed in the second core piece 14b.

  Therefore, in this motor 11, the U1 phase, the V1 phase, the W1 phase, the U2 phase wound around the first core piece 14a due to the difference between the shape of the first core piece 14a and the shape of the second core piece 14b, There will be a difference between the magnetic resistance of the V2 phase and the W2 phase and the magnetic resistance of the U3 phase, V3 phase, W3 phase, U4 phase, V4 phase and W4 phase wound around the second core piece 14b. .

  Here, the positional relationship between the rotor 12 and the stator 13 during the rotation operation of the motor 11 will be described with reference to FIG. In FIG. 3, the center portions in the circumferential direction of the U1, U2, U3, and U4 phases are positioned so as to face the center portions in the circumferential direction of the N1, N2, N3, and N4 phases, respectively. .

  In such a state, the U1 phase, U2 phase, U3 phase, and U4 phase tooth tip portions have the same magnetic flux density between the U1 phase and the N1 pole, and between the U2 phase and the N2 pole, respectively. A (indicated by a dotted line) flows, and magnetic flux B having the same magnetic flux density flows between the U3 phase and the N3 pole and between the U4 phase and the N4 pole. Therefore, between the rotor 2 and the stator 3 of the motor 1, the magnetic flux A flows at two locations, and the magnetic flux B having a different magnetic flux density from the magnetic flux A flows at two locations.

  As in the first embodiment, in the 8-pole 12-slot motor 11, a cogging torque of a theoretical order component is generated every time the rotor 12 is rotated by 15 °. When the rotor 2 is rotated by 15 ° in the counterclockwise direction indicated by the arrow M, the current flowing through the W-phase winding is not shown, but the tips of the W1-phase, W2-phase, W3-phase and W4-phase teeth. Thus, the N-pole magnetism state is obtained, and the circumferential central portions of the W1, W2, W3, and W4 phases are respectively in the circumferential central portions of the S1, S2, S3, and S4 poles. It will be located so as to face each other.

  In such a state, the magnetic flux A flows between the W1 phase and the S1 pole, and between the W2 phase and the S2 pole, and the same magnetic flux between the W3 phase and the S3 pole and between the W4 phase and the S4 pole. A magnetic flux B having a density flows. That is, the magnetic flux A flows at two places between the rotor 2 and the stator 3 of the motor 1, and the magnetic flux B having a different magnetic flux density from the magnetic flux A flows at two places.

  The motor 11 continuously rotates by repeating the rotation of the rotor 12 every 15 °. Therefore, every time the rotor 2 is rotated by 15 °, that is, at the timing when the cogging torque of the theoretical order component of the motor 11 is generated, two magnetic fluxes A and two magnetic fluxes A are placed between the rotor 12 and the stator 13. The magnetic flux B flows and the magnetic flux density distribution is always equal. Therefore, the cogging torque of the pole number component generated when the magnetic flux densities of the U phase, the V phase, and the W phase are different from each other is difficult to be generated.

  Therefore, according to the motor 11 of the second embodiment, the first core piece 14a distributed to the U-phase, V-phase, and W-phase on the stator 12 side in the form of an 8-phase 12-slot motor. And the ratio of the number of the 2nd core piece 14b becomes equal. Therefore, the production efficiency of parts used for manufacturing the motor 11 can be improved, and the cogging torque of the pole number component can be more reliably reduced.

  Although the second embodiment of the present invention has been described so far, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical idea of the present invention.

  For example, as a first modification of the second embodiment of the present invention, as shown in FIG. 4, a group of first core pieces 14a arranged in a row and three second core pieces 14b are arranged in a row and arranged in a row. Such a group may be arranged alternately. That is, the U1 phase, the V1 phase, the W1 phase, the U3 phase, the V3 phase, and the W3 phase are configured in the first core piece 14a, and the U2, V2, W2, U4, V4, and W4 phases are configured in the second core piece 14b. May be configured.

  As a second modification of the second embodiment of the present invention, as shown in FIG. 5, the first core pieces 14a and the second core pieces 14b may be alternately arranged one by one. That is, the U1 phase, V2 phase, W1 phase, U3 phase, V4 phase and W3 phase are configured in the first core piece 14a, and the U2 phase, V1 phase, W2 phase, U4 phase, V3 phase and W4 phase are configured in the second core piece 14b. May be configured.

  Also according to the first modification and the second modification in the second embodiment of the present invention, every time the rotor 12 is rotated by 15 °, that is, at the timing when the cogging torque of the theoretical order component of the motor 1 is generated. Between the two and the stator 3, two magnetic fluxes A and two magnetic fluxes B flow, and the magnetic flux always flows with an equal magnetic flux density distribution. Therefore, the cogging torque of the pole number component generated when the magnetic flux densities of the U phase, the V phase, and the W phase are different from each other is hardly generated.

[Third Embodiment]
A third embodiment of the present invention will be described below. FIG. 6 is a schematic diagram showing the rotor 22 and the stator 23 of the motor 21 in the third embodiment of the present invention.

  The motor 21 according to the third embodiment of the present invention is a 6-pole 9-slot type, and includes a rotor 22 and a stator 23. The rotor 22 is formed in a columnar shape, and is configured to be rotatable around a rotation axis passing through the center of the circle. The rotor 22 includes a permanent magnet 22 b formed in a substantially cylindrical shape, and the permanent magnet 22 b is disposed on the outer periphery of the rotor 22. In this permanent magnet 22b, N poles and S poles are alternately arranged along the circumferential direction of the rotor 22, and the number of poles of the permanent magnet 22b is 6. That is, the permanent magnet 22b includes three N poles (N1, N2, and N3 poles) and three S poles (S1, S2, and S3 poles). The S poles are arranged in the order of N1 pole, S1 pole, N2 pole, S2 pole, N3 pole, and S3 pole in the counterclockwise direction indicated by the arrow M.

  The stator 3 includes a stator core 24 and a three-phase winding composed of a U-phase winding, a V-phase winding, and a W-phase winding. The stator core 24 includes a yoke formed in a cylindrical shape, and nine teeth formed so as to protrude from the yoke toward the center of the stator core 24. Furthermore, the stator core 24 is a split core and is composed of nine core pieces. One core piece is configured to have one tooth.

  The nine core pieces are arranged in an annular shape along the periphery of the rotor 22. The nine core pieces are composed of two types of three first core pieces 24a indicated by hatching and six second core pieces 24b. The first core piece 24a and the second core piece 24b are different from each other and different from each other, as in the first embodiment.

  The three first core pieces 24a are combined and arranged so as to be continuously arranged, and the six second core pieces 24b are combined and arranged so as to be arranged continuously. Therefore, regarding the arrangement of the first core piece 24a and the second core piece 24b, a group of six first core pieces 24a and a group of six second core pieces 24b are arranged so as to be continuously arranged, An annular stator core 4 is formed.

  The U-phase winding, the V-phase winding, and the W-phase winding are each wound around the teeth of separate core pieces. One group of core pieces wound with a U-phase winding, one core piece wound with a V-phase winding, and one core piece wound with a W-phase winding are arranged side by side in a row. ing.

  The U1 phase is configured by winding the U-phase winding around the teeth of one first core piece 24a. Further, by winding the U-phase winding around the teeth of the two second core pieces 24b, the U2-phase and the U3-phase are configured in the second core piece 24b, respectively.

  The V1 phase is configured by winding the V-phase winding around the teeth of one first core piece 24a. Further, the V2 phase and the V3 phase are configured by winding the V-phase winding around the teeth of the three second core pieces 24b.

  The W1 phase is configured by winding the W phase winding around the teeth of one first core piece 24a. Further, the W2 phase and the W3 phase are configured by winding the W phase winding around the teeth of the two second core pieces 24b. Therefore, the motor 21 has nine slots.

  That is, an energized phase composed of three U phases, three V phases, and three W phases is arranged in the counterclockwise direction indicated by an arrow M in the U1 phase, the V1 phase, the W1 phase, the U2 phase, the V2 phase, the W2 phase, The U3 phase, the V3 phase, and the W3 phase are arranged in this order.

  Therefore, in this motor 21, the magnetic resistances of the U1, V1, and W1 phases wound around the first core piece 24a due to the difference between the shape of the first core piece 24a and the shape of the second core piece 24b. A difference also occurs between the magnetic resistances of the U2, V2, W2, U3, V3, and W3 phases wound around the second core piece 4b.

  Here, the positional relationship between the rotor 22 and the stator 23 during the rotation operation of the motor 21 will be described with reference to FIG. In FIG. 6, the center portions in the circumferential direction of the U1, U2, and U3 phases are positioned so as to face the center portions in the circumferential direction of the N1, N2, and N3 phases, respectively.

  In such a state, the magnetic flux A (indicated by a dotted line) flows between the U1 phase and the N1 pole at the tip of the U1, U2, and U3 teeth, and between the U2 and N2 poles, and the U3 phase. And between the N3 poles, the magnetic flux B having the same magnetic flux density flows. Therefore, between the rotor 22 and the stator 23 of the motor 1, the magnetic flux A flows at one place, and the magnetic flux B having a different magnetic flux density from the magnetic flux A flows at two places.

  In this 6-pole 9-slot motor 21, the rotor 22 is rotated by a value of 20 ° (= 360 ° ÷ 18) obtained by dividing the rotation angle of 360 ° by the least common multiple 18 of 6 poles and 9 slots. Every time, a cogging torque of a theoretical order component is generated. When the rotor 22 further rotates 20 ° in the counterclockwise direction indicated by the arrow M, although not shown, the tip portions of the W1, W2 and W3 phase teeth are caused by the current flowing in the W phase winding. It is in a state of being magnetized with N poles, and the central portions in the circumferential direction of the W1, W2, and W3 phases are positioned so as to face the circumferential central portions of the S1, P2, and S3 poles, respectively. Become.

  In such a state, the magnetic flux A flows between the W1 phase and the S1 pole, and the magnetic flux B having the same magnetic flux density flows between the W2 phase and the S2 pole and between the W3 phase and the S3 pole. It will be. That is, the magnetic flux A flows at one place between the rotor 22 and the stator 23 of the motor 21, and the magnetic flux B having a different magnetic flux density from the magnetic flux A flows at two places.

  The motor 21 continuously rotates by repeating the rotation of the rotor 22 every 20 °. Therefore, every time the rotor 22 is rotated by 20 °, that is, at the timing when the cogging torque of the theoretical order component of the motor 21 is generated, one magnetic flux A and two places are provided between the rotor 22 and the stator 23. The magnetic flux B flows and the magnetic flux always flows with the same magnetic flux density distribution. Therefore, the cogging torque of the pole number component generated when the magnetic flux densities of the U phase, the V phase, and the W phase are different from each other is difficult to be generated.

  Therefore, according to the motor 21 of the third embodiment, the cogging torque of the pole number component can be reduced while reducing the cost of the motor in a manner in which the number of core pieces is reduced as in the case of the 6-phase 9-slot motor. It can be reliably reduced.

  Although the third embodiment of the present invention has been described so far, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical idea of the present invention.

[Comparative example]
As a comparative example with the embodiment of the present invention described above, a motor 31 as shown in FIG. 8 is given. FIG. 8 is a schematic diagram showing the rotor 22 and the stator 23 of the motor 21 of the comparative example.

  In the 8-pole 12-slot motor 31 shown in FIG. 8, the permanent magnet 32a provided on the rotor 32 includes four N poles (N1, N2, N3, N4) and four S poles ( S1 pole, S2 pole, S3 pole, S4 pole), and four N poles and four S poles in the counterclockwise direction are N1, S1, N2, S2, N3, S3, N4 poles and S4 poles are arranged in this order.

  The stator core 34 provided on the stator 33 includes twelve teeth protruding from the yoke toward the center of the stator core 34. These teeth are wound with a three-phase winding consisting of a U-phase winding, a V-phase winding, and a W-phase winding, and in the counterclockwise direction, U1, V1, W1, U2, The energized phases are arranged in the order of the V2, W2, U3, V3 and W3 phases.

  The stator core 34 is a split core, and is composed of twelve core pieces. One core piece includes one tooth. The twelve core pieces are composed of a first core piece 34a and a second core piece 34b, which are two types of core pieces produced by a two-piece press die. The first core piece 34a is arranged to have a U2, V1, V2, W1, W2, and W4 phases, and the second core piece 34b has a U1, U3, U4, V3 phase, It arrange | positions so that it may have V4 phase and W3 phase.

  Here, the positional relationship between the rotor 22 and the stator 23 during the rotating operation of the motor 21 will be described with reference to FIGS. 8 and 9. In FIG. 8, the center portions in the circumferential direction of the U1, U2, U3, and U4 phases are positioned so as to face the center portions in the circumferential direction of the N1, N2, N3, and N4 phases, respectively. .

  In such a state, the magnetic flux A (indicated by a dotted line) flows between the U2 phase and the N2 pole at the tip of the U1, U2, U3, and U4 teeth, and between the U1 and N1 poles. The magnetic flux B having the same magnetic flux density flows between the U3 phase and the N3 pole and between the U4 phase and the N4 pole. Therefore, between the rotor 32 and the stator 33 of the motor 31, the magnetic flux A flows at one place, and the magnetic flux B having a different magnetic flux density from the magnetic flux A flows at three places.

  On the other hand, when the rotor 32 is further rotated counterclockwise by 15 ° from the state of FIG. 8 and is in the state of FIG. 9, it is between the W1 phase and the S1 pole and between the W2 phase and the S2 pole. A magnetic flux A (indicated by a dotted line) flows between the W3 phase and the S3 pole, and a magnetic flux B having an equivalent magnetic flux density flows between the W4 phase and the S4 pole. That is, between the rotor 32 and the stator 33 of the motor 31, the magnetic flux A flows at two places, and the magnetic flux B having a different magnetic flux density from the magnetic flux A flows at two places.

  Therefore, in the motor 31 of the comparative example, the distribution of the magnetic flux density in FIG. 8 and the distribution of the magnetic flux density in FIG. 9 are different, and this causes a cogging torque having a pole number component.

  Here, when the cogging torque generated by the motor 31 of the comparative example, the motor 1 of the first embodiment of the present invention, and the motor 11 of the second embodiment is analyzed, the result shown in FIG. 7 is obtained. Obtained.

  In FIG. 7, the horizontal axis represents the rotation angle (degrees) of the rotor, and the vertical axis represents the torque (mN · m). Further, in FIG. 7, the cogging torque C of the motor 1 of the first embodiment is represented by a solid line, the cogging torque D of the motor 11 of the second embodiment is represented by a one-dot chain line, and the cogging torque E of the motor 31 of the comparative example is It is represented by a dotted line. Note that the first modification and the second modification of the second embodiment result in the generation of cogging torque similar to that of the second embodiment, and are therefore omitted in the comparison in FIG.

  In the waveform of the cogging torque C of the motor 1, the torque peak values in each cycle are equal to each other. Moreover, in the cogging torque D of the motor 11, the peak value of the torque in each cycle is equal. The cogging torque C of the motor 1 is smaller than the cogging torque D of the motor 11.

  On the other hand, in the waveform of the cogging torque E of the motor 31 of the comparative example, the value of one cycle peak is larger than the value of the cogging torque D of the motor 11, and the next half cycle peak value is It is smaller than the value of the cogging torque D. That is, in the motor 31 of the comparative example, the cogging torque of the order component such as the cogging torque of the pole number component is generated. The motor 31 of the comparative example repeats such a rotation operation.

  Therefore, compared with the motor 31 of the comparative example, in the motor 1 of the first embodiment and the motor 11 of the second embodiment of the present invention, generation of cogging torque of the order component such as the cogging torque of the pole component is suppressed. Is done. That is, only the cogging torque of the theoretical order component remains, and it can be seen that a stable and constant torque performance can be obtained.

1,11,21,31 Permanent magnet rotating machine (motor)
2, 12, 22, 32 Rotor 2a, 12a, 22a, 33a Permanent magnet 3, 13, 23, 33 Stator 4, 14, 24, 34 Stator core 4a, 14a, 24a, 34a First core piece 4b, 14b, 24b, 34b Second core piece U1, U2, U3, U4 U phase V1, V2, V3, V4 V phase W1, W2, W3, W4 W phase A, B Magnetic flux C, D, E Cogging torque M Arrow

Claims (7)

A rotor having permanent magnets;
A plurality of core pieces composed of two types of core pieces that are designed to have the same shape but have different magnetoresistance due to the difference in shape due to the difference between the two types of manufacturing conditions;
A stator core configured by arranging the plurality of core pieces in an annular shape; and
A three-phase winding consisting of a U phase, a V phase and a W phase;
A stator having the stator core, wherein each phase of the three-phase winding is wound around a separate core piece, and
The number of poles of the permanent magnet is 2n, N poles and S poles are alternately arranged along the circumferential direction of the permanent magnet, the number of slots of the stator is 3n, and the U-phase winding is One group of core pieces wound, one core piece around which the V-phase winding is wound, and one group of core pieces around which the W-phase winding is wound are arranged side by side, and the value of n is 2 or more. A method of manufacturing a permanent magnet type rotating machine with an integer of
Each time the rotor is rotated by an angle obtained by dividing a rotation angle of 360 ° by the least common multiple of the number of poles of the permanent magnet 2n and the number of slots of the stator 3n, the rotor is rotated between the stator and the stator each time the rotor is rotated. A step of combining and arranging the two kinds of core pieces so as to equalize the magnetic flux density distribution of the magnetic flux flowing in
When the value of n is 4, the step of arranging and combining the two types of core pieces includes the step of arranging one of the two types of core pieces in a row and the other of the two types of core pieces as 9 A method of manufacturing a permanent magnet type rotating machine. A rotor having permanent magnets;
A plurality of core pieces composed of two types of core pieces that are designed to have the same shape but have different magnetoresistance due to the difference in shape due to the difference between the two types of manufacturing conditions;
A stator core configured by arranging the plurality of core pieces in an annular shape; and
A three-phase winding consisting of a U phase, a V phase and a W phase;
A stator having the stator core, wherein each phase of the three-phase winding is wound around a separate core piece, and
The number of poles of the permanent magnet is 2n, N poles and S poles are alternately arranged along the circumferential direction of the permanent magnet, the number of slots of the stator is 3n, and the U-phase winding is One group of core pieces wound, one core piece around which the V-phase winding is wound, and one group of core pieces around which the W-phase winding is wound are arranged side by side, and the value of n is 2 or more. A method of manufacturing a permanent magnet type rotating machine with an integer of
Each time the rotor is rotated by an angle obtained by dividing a rotation angle of 360 ° by the least common multiple of the number of poles of the permanent magnet 2n and the number of slots of the stator 3n, the rotor is rotated between the stator and the stator each time the rotor is rotated. A step of combining and arranging the two kinds of core pieces so as to equalize the magnetic flux density distribution of the magnetic flux flowing in
When the value of n is 4, the step of arranging the two types of core pieces in combination includes one of the two types of core pieces, two of the four core pieces around which the U-phase winding is wound, A method for manufacturing a permanent magnet type rotating machine, comprising the step of combining and arranging two of the core pieces wound with the V-phase winding and two of the core pieces wound with the four W-phase windings. A rotor having permanent magnets;
A plurality of core pieces composed of two types of core pieces that are designed to have the same shape but have different magnetoresistance due to the difference in shape due to the difference between the two types of manufacturing conditions;
A stator core configured by arranging the plurality of core pieces in an annular shape; and
A three-phase winding consisting of a U phase, a V phase and a W phase;
A stator having the stator core, wherein each phase of the three-phase winding is wound around a separate core piece, and
The number of poles of the permanent magnet is 2n, N poles and S poles are alternately arranged along the circumferential direction of the permanent magnet, the number of slots of the stator is 3n, and the U-phase winding is One group of core pieces wound, one core piece around which the V-phase winding is wound, and one group of core pieces around which the W-phase winding is wound are arranged side by side, and the value of n is 2 or more. A method of manufacturing a permanent magnet type rotating machine with an integer of
Each time the rotor is rotated by an angle obtained by dividing a rotation angle of 360 ° by the least common multiple of the number of poles of the permanent magnet 2n and the number of slots of the stator 3n, the rotor is rotated between the stator and the stator each time the rotor is rotated. A step of combining and arranging the two kinds of core pieces so as to equalize the magnetic flux density distribution of the magnetic flux flowing in
When the value of n is 4, the step of arranging the two types of core pieces in combination includes the step of arranging one of the two types of core pieces in a row and the other of the two types of core pieces as 6 A method of manufacturing a permanent magnet type rotating machine. A rotor having permanent magnets;
A plurality of core pieces composed of two types of core pieces that are designed to have the same shape but have different magnetoresistance due to the difference in shape due to the difference between the two types of manufacturing conditions;
A stator core configured by arranging the plurality of core pieces in an annular shape; and
A three-phase winding consisting of a U phase, a V phase and a W phase;
A stator having the stator core, wherein each phase of the three-phase winding is wound around a separate core piece, and
The number of poles of the permanent magnet is 2n, N poles and S poles are alternately arranged along the circumferential direction of the permanent magnet, the number of slots of the stator is 3n, and the U-phase winding is One group of core pieces wound, one core piece around which the V-phase winding is wound, and one group of core pieces around which the W-phase winding is wound are arranged side by side, and the value of n is 2 or more. A method of manufacturing a permanent magnet type rotating machine with an integer of
Each time the rotor is rotated by an angle obtained by dividing a rotation angle of 360 ° by the least common multiple of the number of poles of the permanent magnet 2n and the number of slots of the stator 3n, the rotor is rotated between the stator and the stator each time the rotor is rotated. A step of combining and arranging the two kinds of core pieces so as to equalize the magnetic flux density distribution of the magnetic flux flowing in
When the value of n is 4, the step of arranging the two types of core pieces in combination includes alternately arranging one of the two types of core pieces and the other of the two types of core pieces one by one. A manufacturing method of a permanent magnet type rotating machine including: A rotor having permanent magnets;
A plurality of core pieces composed of two types of core pieces that are designed to have the same shape but have different magnetoresistance due to the difference in shape due to the difference between the two types of manufacturing conditions;
A stator core configured by arranging the plurality of core pieces in an annular shape; and
A three-phase winding consisting of a U phase, a V phase and a W phase;
A stator having the stator core, wherein each phase of the three-phase winding is wound around a separate core piece, and
The number of poles of the permanent magnet is 2n, N poles and S poles are alternately arranged along the circumferential direction of the permanent magnet, the number of slots of the stator is 3n, and the U-phase winding is One group of core pieces wound, one core piece around which the V-phase winding is wound, and one group of core pieces around which the W-phase winding is wound are arranged side by side, and the value of n is 2 or more. A method of manufacturing a permanent magnet type rotating machine with an integer of
Each time the rotor is rotated by an angle obtained by dividing a rotation angle of 360 ° by the least common multiple of the number of poles of the permanent magnet 2n and the number of slots of the stator 3n, the rotor is rotated between the stator and the stator each time the rotor is rotated. A step of combining and arranging the two kinds of core pieces so as to equalize the magnetic flux density distribution of the magnetic flux flowing in
When the value of n is 4, the step of arranging the two types of core pieces in combination includes a group in which one of the two types of core pieces is arranged in a row and the other of the two types of core pieces. A method of manufacturing a permanent magnet rotating machine, including a step of alternately arranging a group of three pieces arranged side by side. A rotor having permanent magnets;
A plurality of core pieces composed of two types of core pieces that are designed to have the same shape but have different magnetoresistance due to the difference in shape due to the difference between the two types of manufacturing conditions;
A stator core configured by arranging the plurality of core pieces in an annular shape; and
A three-phase winding consisting of a U phase, a V phase and a W phase;
A stator having the stator core, wherein each phase of the three-phase winding is wound around a separate core piece, and
The number of poles of the permanent magnet is 2n, N poles and S poles are alternately arranged along the circumferential direction of the permanent magnet, the number of slots of the stator is 3n, and the U-phase winding is One group of core pieces wound, one core piece around which the V-phase winding is wound, and one group of core pieces around which the W-phase winding is wound are arranged side by side, and the value of n is 2 or more. A method of manufacturing a permanent magnet type rotating machine with an integer of
Each time the rotor is rotated by an angle obtained by dividing a rotation angle of 360 ° by the least common multiple of the number of poles of the permanent magnet 2n and the number of slots of the stator 3n, the rotor is rotated between the stator and the stator each time the rotor is rotated. A step of combining and arranging the two kinds of core pieces so as to equalize the magnetic flux density distribution of the magnetic flux flowing in
When the value of n is 3, the step of arranging the two kinds of core pieces in combination includes one of the two kinds of core pieces, one of the three core pieces around which the U-phase winding is wound, A method for manufacturing a permanent magnet rotating machine, comprising the step of combining and arranging one of the core pieces wound with the V-phase winding and one of the core pieces wound with the three W-phase windings. A rotor having permanent magnets;
A plurality of core pieces composed of two types of core pieces that are designed to have the same shape but have different magnetoresistance due to the difference in shape due to the difference between the two types of manufacturing conditions;
A stator core configured by arranging the plurality of core pieces in an annular shape; and
A three-phase winding consisting of a U phase, a V phase and a W phase;
A stator having the stator core, wherein each phase of the three-phase winding is wound around a separate core piece, and
The number of poles of the permanent magnet is 2n, N poles and S poles are alternately arranged along the circumferential direction of the permanent magnet, the number of slots of the stator is 3n, and the U-phase winding is One group of core pieces wound, one core piece around which the V-phase winding is wound, and one group of core pieces around which the W-phase winding is wound are arranged side by side, and the value of n is 2 or more. A method of manufacturing a permanent magnet type rotating machine with an integer of
Each time the rotor is rotated by an angle obtained by dividing a rotation angle of 360 ° by the least common multiple of the number of poles of the permanent magnet 2n and the number of slots of the stator 3n, the rotor is rotated between the stator and the stator each time the rotor is rotated. A step of combining and arranging the two kinds of core pieces so as to equalize the magnetic flux density distribution of the magnetic flux flowing in
When the value of n is 3, the step of arranging the two types of core pieces in combination includes the step of arranging one of the two types of core pieces in a row and the other of the two types of core pieces as 6 A method of manufacturing a permanent magnet type rotating machine.

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