JP2005124333A - Motor and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor capable of reducing a short-circuited flux of a magnet and securing a centrifugal force resistance property. <P>SOLUTION: The motor comprises a stator 10 and a rotor 30. The rotor 30 comprises a plurality of rotor magnetic poles each composed of the same constitution of the rotor magnetic pole 31. The rotor magnetic pole 31 is composed of a rotor core 3, air gaps 4A, 4B and 4C, and permanent magnets 5A, 5B. The permanent magnets 5A, 5B are inserted into a magnet insertion hole 8. The rotor core 3 comprises holding parts 3A, 3B, 3C 3D and 3E, and magnetic poles 3F, 3G and 3H. The holding parts 3A, 3B are arranged so as to contact with the air gaps 4A, 4B, respectively. The holding part 3A, 3B are higher than the magnetic poles 3F, 3G and 3H in heights. The holding part 3A, 3B resist against centrifugal forces of the permanent magnets 5A, 5B that are generated by the rotation of the rotor 30 circumferentially DR1, and hold the permanent magnets 5A, 5B, respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric motor having a permanent magnet disposed on a rotor and a method for manufacturing the same.

  A conventional permanent magnet type motor includes a rotor core, a permanent magnet, and a magnetic pole coupling portion. The rotor core has a V-shaped magnet insertion hole. In this case, the magnet insertion hole is provided so that the V-shaped opening portion faces the outer peripheral direction of the rotor core.

The permanent magnet is inserted into the magnet insertion hole from the direction of the rotation axis of the rotor core. The magnetic pole coupling portion is provided in contact with the permanent magnet between the side surface of the permanent magnet and the outer peripheral surface of the rotor core. The magnetic pole connecting portion is composed of a narrow portion having a narrow radial width of the rotor core and a wide portion having a wide radial width of the rotor core. The wide portion is in contact with the narrow portion, and is disposed closer to the V-shaped opening than the narrow portion (Patent Document 1).
JP 09-009537 A JP 2000-60038 A

  However, there is a problem that the short circuit magnetic flux of the magnet cannot be reduced simply by arranging the magnet as in the conventional permanent magnet motor, and the performance of the motor is lowered. In addition, the resistance to centrifugal force that holds the magnet against the centrifugal force of the magnet based on the rotation of the rotor may be reduced.

  Therefore, the present invention has been made to solve such a problem, and an object of the present invention is to provide an electric motor capable of reducing a short-circuit magnetic flux of a magnet and ensuring a centrifugal force resistance.

  Another object of the present invention is to provide a method for manufacturing an electric motor capable of reducing a short-circuit magnetic flux of a magnet and ensuring centrifugal resistance.

  According to this invention, an electric motor is an electric motor provided with a stator and a rotor. The rotor includes a rotor core and a plurality of magnets. The rotor core is composed of a plurality of ferromagnetic members stacked in the direction of the rotation axis of the rotor. The plurality of magnets are provided in the circumferential direction of the rotor, and each is inserted into the rotor core from the rotation axis direction of the rotor. The rotor core has a plurality of magnet insertion holes, a plurality of first magnet holding portions, and a plurality of second magnet holding portions. The plurality of magnet insertion holes are provided in the circumferential direction of the rotor and are holes for inserting a plurality of magnets. Each of the plurality of first magnet holding portions is provided in contact with one end of the magnet insertion hole on the outer peripheral side of the magnet insertion hole, and holds the magnet against the centrifugal force of the magnet based on the rotation of the rotor. To do. Each of the plurality of second magnet holding portions is provided on the outer peripheral side of the magnet insertion hole in contact with the other end of the magnet insertion hole, and holds the magnet against the centrifugal force of the magnet based on the rotation of the rotor. To do. Each of the plurality of first and second magnet holding portions has a magnetic permeability smaller than the magnetic permeability of the ferromagnetic member in the circumferential direction of the rotor.

  Preferably, each of the plurality of first and second magnet holding portions is subjected to processing for reducing the magnetic permeability in the circumferential direction of the rotor.

  Preferably, each of the plurality of ferromagnetic members has a plurality of through holes, a plurality of first thin portions, and a plurality of second thin portions. The plurality of through holes are holes for penetrating the ferromagnetic member in the rotation axis direction of the rotor to form a plurality of magnet insertion holes. Each of the plurality of first thin portions is provided in contact with one end of the through hole on the outer peripheral side of the through hole in the radial direction of the rotor, and the thickness of the rotor in the rotation axis direction is larger than that of the other portion. thin. Each of the plurality of second thin portions is provided on the outer peripheral side of the through hole in the radial direction of the rotor so as to be in contact with the other end of the through hole, and the thickness of the rotor in the rotation axis direction is larger than that of other portions. thin. Each of the plurality of first magnet holding portions is formed of a plurality of ferromagnetic members, and includes a plurality of first thin portions that are arranged substantially linearly in the rotation axis direction of the rotor. Each of the plurality of second magnet holding portions is formed of a plurality of second thin portions formed in a plurality of ferromagnetic members and arranged substantially linearly in the direction of the rotation axis of the rotor. Further, each of the plurality of magnet insertion holes includes a plurality of through holes formed in the plurality of ferromagnetic members and arranged substantially linearly in the rotation axis direction of the rotor.

  Preferably, each of the plurality of ferromagnetic members has a plurality of through holes, a plurality of first twisted portions, and a plurality of second twisted portions. The plurality of through holes are holes for penetrating the ferromagnetic member in the rotation axis direction of the rotor to form a plurality of magnet insertion holes. Each of the plurality of first twisted portions is provided in contact with one end of the through hole on the outer peripheral side of the through hole in the radial direction of the rotor, and at least one rotation around a straight line connecting both end portions of the through hole Twisted. Each of the plurality of second twisted portions is provided in contact with the other end of the through hole on the outer peripheral side of the through hole in the radial direction of the rotor, and at least one rotation around a straight line connecting both end portions of the through hole Twisted. Each of the plurality of first magnet holding portions includes a plurality of first twist portions formed on the plurality of ferromagnetic members and arranged substantially linearly in the rotation axis direction of the rotor. Each of the plurality of second magnet holding portions is formed of a plurality of second twist portions formed on a plurality of ferromagnetic members and arranged substantially linearly in the direction of the rotation axis of the rotor. Further, each of the plurality of magnet insertion holes includes a plurality of through holes formed in the plurality of ferromagnetic members and arranged substantially linearly in the rotation axis direction of the rotor.

  Preferably, each of the plurality of ferromagnetic members has a plurality of through holes, a plurality of first easy axis change units, and a plurality of second easy axis change units. The plurality of through holes are holes for penetrating the ferromagnetic member in the rotation axis direction of the rotor to form a plurality of magnet insertion holes. Each of the plurality of first easy-magnetization axis changing portions is provided in contact with one end of the through hole on the outer peripheral side of the through hole in the radial direction of the rotor and is magnetized in a direction substantially orthogonal to the circumferential direction of the rotor. Has an easy axis. Further, each of the plurality of second easy-magnetization-axis changing portions is provided in contact with the other end of the through hole on the outer peripheral side of the through hole in the radial direction of the rotor and substantially orthogonal to the circumferential direction of the rotor Has an easy axis of magnetization. Each of the plurality of first magnet holding portions includes a plurality of first easy-magnetization axis changing portions formed on the plurality of ferromagnetic members and arranged substantially linearly in the rotation axis direction of the rotor. Each of the plurality of second magnet holding portions includes a plurality of second easy-magnetization-axis changing portions that are formed on the plurality of ferromagnetic members and arranged substantially linearly in the rotation axis direction of the rotor. Further, each of the plurality of magnet insertion holes includes a plurality of through holes formed in the plurality of ferromagnetic members and arranged substantially linearly in the rotation axis direction of the rotor.

  Preferably, each of the plurality of first and second easy axis changing units has an easy axis close to the radial direction of the rotor or the rotation axis direction of the rotor.

  Preferably, each of the plurality of ferromagnetic members has a plurality of through holes, a plurality of first impurity-containing portions, and a plurality of second impurity-containing portions. The plurality of through holes are holes for penetrating the ferromagnetic member in the rotation axis direction of the rotor to form a plurality of magnet insertion holes. Each of the plurality of first impurity-containing portions is provided in contact with one end of the through hole on the outer peripheral side of the through hole in the radial direction of the rotor and includes an impurity that lowers the magnetic permeability. Each of the plurality of second impurity-containing portions is provided in contact with the other end of the through hole on the outer peripheral side of the through hole in the radial direction of the rotor and includes an impurity that lowers the magnetic permeability. Each of the plurality of first magnet holding portions includes a plurality of first impurity-containing portions formed in a plurality of ferromagnetic members and arranged substantially linearly in the rotation axis direction of the rotor. Each of the plurality of second magnet holding parts is formed of a plurality of second impurity-containing parts that are formed on a plurality of ferromagnetic members and arranged substantially linearly in the direction of the rotation axis of the rotor. Further, each of the plurality of magnet insertion holes includes a plurality of through holes formed in the plurality of ferromagnetic members and arranged substantially linearly in the rotation axis direction of the rotor.

  Preferably, each of the plurality of first and second impurity-containing portions contains carbon or nitrogen.

  Preferably, each of the plurality of ferromagnetic members has a substantially uniform thickness in an in-plane direction substantially perpendicular to the rotation axis of the rotor.

  Preferably, each of the plurality of magnets includes first and second magnets arranged in a substantially V shape so that the V-shaped opening portion faces the outer circumferential direction of the rotor. The plurality of first magnet holders hold the plurality of first magnets arranged in the circumferential direction of the rotor against the centrifugal force. The plurality of second magnet holders hold the plurality of second magnets arranged in the circumferential direction of the rotor against the centrifugal force.

  Moreover, according to this invention, the manufacturing method of an electric motor is a manufacturing method of an electric motor provided with a stator and a rotor. The rotor includes a rotor core composed of a plurality of ferromagnetic members stacked in the direction of the rotation axis of the rotor, and a plurality of magnets that are provided in the circumferential direction of the rotor and that are each inserted into the rotor core from the direction of the rotation axis of the rotor. Including. The rotor core is disposed in the circumferential direction of the rotor, and is provided with a plurality of magnet insertion holes for inserting a plurality of magnets, each in contact with one end of the magnet insertion hole on the outer peripheral side of the magnet insertion hole, And a plurality of first magnet holding portions that hold the magnet against the centrifugal force of the magnet based on the rotation of the rotor, and each is provided on the outer peripheral side of the magnet insertion hole and in contact with the other end of the magnet insertion hole. And a plurality of second magnet holding portions that hold the magnet against the centrifugal force of the magnet based on the rotation of the rotor.

  The manufacturing method of the electric motor includes a plurality of first and second regions in a circumferential direction with respect to the plurality of first and second regions of the ferromagnetic member in which the plurality of first and second magnet holding portions are formed. A first step of performing a process of making the magnetic permeability in the region smaller than the magnetic permeability of the other region, a plurality of both end portions in contact with the first and second regions, and each penetrating the ferromagnetic member A second step of producing the through holes at positions on the inner peripheral side of the plurality of first and second regions, a third step of repeating the first and second steps for the plurality of ferromagnetic members, After the third step, a fourth step of laminating a plurality of ferromagnetic members so that a plurality of magnet insertion holes are formed by the plurality of through holes, and a plurality of magnets after the fourth step And a fifth step of inserting into the magnet insertion hole.

  Preferably, the first step is a step of pressing the plurality of first and second regions so that the thicknesses of the plurality of first and second regions are thinner than the other regions. And a 2nd process is performed after a 1st process.

  Preferably, the first step is a step that is performed after the second step and twists the plurality of third regions each surrounded by the first and second regions and the through hole at least once.

  Preferably, the first step is a step that is performed after the second step and brings the easy axis directions of the plurality of first and second regions closer to a direction substantially perpendicular to the circumferential direction of the rotor.

  Preferably, the first step is a step of causing the easy axis directions of the plurality of first and second regions to approach the radial direction of the rotor.

  Preferably, the first step is a step of causing the easy axis directions of the plurality of first and second regions to approach the rotation axis direction of the rotor.

  Preferably, the first step is a step of processing the plurality of first and second regions at a predetermined temperature and a predetermined pressure.

  Furthermore, according to this invention, the manufacturing method of an electric motor is a manufacturing method of an electric motor provided with a stator and a rotor. The rotor includes a rotor core composed of a plurality of ferromagnetic members stacked in the direction of the rotation axis of the rotor, and a plurality of magnets that are provided in the circumferential direction of the rotor and that are each inserted into the rotor core from the direction of the rotation axis of the rotor. Including. The rotor core is disposed in the circumferential direction of the rotor, and is provided with a plurality of magnet insertion holes for inserting a plurality of magnets, each in contact with one end of the magnet insertion hole on the outer peripheral side of the magnet insertion hole, And a plurality of first magnet holding portions that hold the magnet against the centrifugal force of the magnet based on the rotation of the rotor, and each is provided on the outer peripheral side of the magnet insertion hole and in contact with the other end of the magnet insertion hole. And a plurality of second magnet holding portions that hold the magnet against the centrifugal force of the magnet based on the rotation of the rotor.

  The method for manufacturing an electric motor includes a first step of cutting out a plurality of ferromagnetic members from a flat ferromagnetic member, and a plurality of first and second magnet holding portions in each of the cut out ferromagnetic members. A plurality of penetrations in which both end portions are in contact with the first and second regions, respectively, and each penetrates the ferromagnetic member, at positions on the inner peripheral side of the plurality of first and second regions formed A second step of creating a hole, and a third step of laminating a plurality of ferromagnetic members so that a plurality of magnet insertion holes are formed by the plurality of through-holes after the second step. In each of the plurality of ferromagnetic members, a plurality of first and second regions are subjected to a magnetic permeability lowering process that lowers the magnetic permeability of the plurality of first and second regions with impurities than the magnetic permeability of other regions. After the fourth step and the fourth step, a plurality of magnets are inserted into a plurality of magnet insertion holes. And a fifth step of.

  Furthermore, according to this invention, the manufacturing method of an electric motor is a manufacturing method of an electric motor provided with a stator and a rotor. The rotor includes a rotor core composed of a plurality of ferromagnetic members stacked in the direction of the rotation axis of the rotor, and a plurality of magnets that are provided in the circumferential direction of the rotor and that are each inserted into the rotor core from the direction of the rotation axis of the rotor. Including. The rotor core is disposed in the circumferential direction of the rotor, and is provided with a plurality of magnet insertion holes for inserting a plurality of magnets, each in contact with one end of the magnet insertion hole on the outer peripheral side of the magnet insertion hole, And a plurality of first magnet holding portions that hold the magnet against the centrifugal force of the magnet based on the rotation of the rotor, and each is provided on the outer peripheral side of the magnet insertion hole and in contact with the other end of the magnet insertion hole. And a plurality of second magnet holding portions that hold the magnet against the centrifugal force of the magnet based on the rotation of the rotor.

  In the method for manufacturing an electric motor, a plurality of first and second magnet holding portions are formed in each of a plurality of regions for cutting out a plurality of ferromagnetic members of a flat ferromagnetic member. A first step of subjecting the second region to a magnetic permeability lowering treatment that lowers the magnetic permeability of the plurality of first and second regions by the impurity as compared with the magnetic permeability of the other regions; In the second step of cutting out the plurality of ferromagnetic members from the magnetic member, and in each of the plurality of cut out ferromagnetic members, both end portions are in contact with the first and second regions, respectively, and A third step of producing a plurality of through holes penetrating the ferromagnetic member at positions on the inner peripheral side of the plurality of first and second regions, and a plurality of magnets by the plurality of through holes after the third step A fourth step of laminating a plurality of ferromagnetic members so as to form an insertion hole; After the fourth step, and a fifth step of inserting a plurality of magnets in a plurality of magnet insertion holes.

  Preferably, the magnetic permeability reduction process is a process of heating the plurality of first and second regions to a predetermined temperature while spraying a gas containing impurities onto the plurality of first and second regions.

  Preferably, the magnetic permeability lowering process is a step of placing a solid containing impurities on the plurality of first and second regions and heating the plurality of first and second regions to a predetermined temperature to melt the solid. .

  Preferably, the impurity is nitrogen or carbon.

  The electric motor according to the present invention includes a rotor having a plurality of rotor magnetic poles in the circumferential direction, and each of the plurality of rotor magnetic poles is disposed at both ends of the permanent magnet, and two holding portions for holding the permanent magnets. The two holding parts have a magnetic permeability in the circumferential direction that is smaller than the permeability of other parts (that is, the permeability of the magnetic steel sheet constituting the rotor), so that the permanent magnet is short-circuited on the two holding part sides. It becomes difficult to form a magnetic path, and the two holding portions oppose the centrifugal force of the magnet based on the rotation of the rotor. And the short circuit magnetic flux in the two holding | maintenance part sides is reduced, and the centrifugal force resistance with respect to a permanent magnet is ensured.

  Therefore, according to the present invention, the short-circuit magnetic flux of the magnet can be reduced and the centrifugal force resistance can be ensured.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
1 is a plan view of an electric motor according to Embodiment 1 of the present invention as viewed from the direction of the rotation axis. Referring to FIG. 1, electric motor 50 according to the first embodiment includes a stator 10 and a rotor 30. The stator 10 has stator magnetic poles 11 to 24 in the circumferential direction DR1. The rotor 30 is disposed on the inner peripheral side of the stator 10 with a gap GAP therebetween. The rotor 30 has rotor magnetic poles 31 to 44 in the circumferential direction DR1.

  When the rotor 30 receives a magnetic force from the stator magnetic poles 11 to 24 of the stator 10 to the rotor magnetic poles 31 to 44, the rotor 30 rotates about the rotation shaft 30A. The electric motor 50 outputs a predetermined torque from the rotary shaft 30A.

  FIG. 2 is an enlarged view of a region A shown in FIG. FIG. 3 is a plan view of a magnet insertion hole into which the permanent magnet shown in FIG. 2 is inserted. With reference to FIG. 2, the stator magnetic pole 11 includes a magnetic pole portion 1 and a coil 2. The coil 2 is provided on both sides of the magnetic pole part 1. The magnetic pole part 1 is formed by winding the coil 2 around the stator core 10A. The stator core 10A is manufactured by laminating a plurality of electromagnetic steel plates in the direction of the rotation axis of the rotor 30 (direction perpendicular to the paper surface).

  Each of the stator magnetic poles 12 to 24 has the same configuration as the stator magnetic pole 11.

  Referring to FIGS. 2 and 3, rotor 30 has a rotor core 60. The rotor core 60 has a magnet insertion hole 8. And permanent magnet 5A, 5B is inserted in the magnet insertion hole 8 from the rotating shaft direction (direction perpendicular | vertical to a paper surface) of the rotor 30. FIG.

  The rotor magnetic pole 31 includes the rotor core portion 3, the air gaps 4A, 4B, and 4C, and the permanent magnets 5A and 5B. The rotor core portion 3 has a substantially V-shaped magnet insertion hole 8. The magnet insertion hole 8 is provided so that the V-shaped opening 8 </ b> A faces the outer circumferential direction of the rotor 30. The permanent magnets 5A and 5B are inserted into the magnet insertion hole 8. In this case, the permanent magnets 5A and 5B have the same polarity, for example, N pole, on the outer peripheral side (V-shaped opening 8A side) of the rotor 30, and the inner peripheral side (V-shaped opening 8A) of the rotor 30. The opposite side) has the same polarity, for example, the S pole. The permanent magnets 5A and 5B have an S pole on the outer peripheral side (V-shaped opening 8A side) of the rotor 30 and an N pole on the inner peripheral side of the rotor 30 (the side opposite to the V-shaped opening 8A). You may have. That is, the permanent magnets 5A and 5B are V-shaped so as to have the same polarity on the outer peripheral side (the side opposite to the V-shaped opening 8A) and the inner peripheral side (the side opposite to the V-shaped opening 8A) of the rotor 30. It suffices to be arranged in

  By inserting the permanent magnets 5A and 5B into the magnet insertion hole 8, gaps 4A, 4B and 4C are formed. The air gap 4A, the permanent magnet 5A, the air gap 4C, the permanent magnet 5B, and the air gap 4B are sequentially arranged in the circumferential direction DR1 of the rotor 30. The air gaps 4A and 4B are provided at both ends of the permanent magnets 5A and 5B in the circumferential direction DR1 of the rotor 30 in contact with the permanent magnets 5A and 5B, respectively. The gap 4C is provided between the permanent magnet 5A and the permanent magnet 5B in the circumferential direction DR1 of the rotor 30, and is in contact with the permanent magnets 5A and 5B.

  The rotor core portion 3 surrounds the air gaps 4A, 4B, 4C and the permanent magnets 5A, 5B, and includes holding portions 3A, 3B, 3C, 3D, 3E and magnetic pole portions 3F, 3G, 3H. The holding portion 3A is in contact with the gap 4A and is provided on the outer peripheral side of the gap 4A in the radial direction of the rotor 30. The holding portion 3B is in contact with the gap 4B and is provided on the outer peripheral side of the gap 4B in the radial direction of the rotor 30. That is, the holding portions 3A and 3B are provided at both ends of the permanent magnets 5A and 5B in the circumferential direction DR1 of the rotor 30. And holding part 3A, 3B opposes the centrifugal force of permanent magnet 5A, 5B which arises when the rotor 30 rotates to the circumferential direction DR1, and hold | maintains permanent magnet 5A, 5B, respectively.

  The holding portion 3 </ b> C is provided on the inner peripheral side of the gap 4 </ b> A in the radial direction of the rotor 30, and holds the permanent magnet 5 </ b> A in the circumferential direction of the rotor 30. Holding portion 3 </ b> D is provided on the inner circumferential side with respect to gap 4 </ b> C in the radial direction of rotor 30, and holds permanent magnets 5 </ b> A and 5 </ b> B in the circumferential direction of rotor 30. The holding portion 3 </ b> E is provided on the inner peripheral side of the gap 4 </ b> B in the radial direction of the rotor 30, and holds the permanent magnet 5 </ b> B in the circumferential direction of the rotor 30.

  The magnetic pole part 3F is provided on the outer peripheral side of the permanent magnets 5A and 5B and in contact with the permanent magnets 5A and 5B between the holding part 3A and the holding part 3B. The magnetic pole part 3G is provided adjacent to the holding part 3C and the gap 4A, and the magnetic pole part 3H is provided adjacent to the holding part 3E and the gap 4B. The magnetic pole portions 3G and 3H are also called “saliency poles”.

  Each of the rotor magnetic poles 32 to 44 has the same configuration as the rotor magnetic pole 31.

  4 is a plan view of the holding portions 3A and 3B and the magnetic pole portions 3F, 3G, and 3H constituting the one rotor magnetic pole 31 shown in FIG. Referring to FIG. 4, rotor core 60 has a structure in which electromagnetic steel plates 61 to 6 n (n is a natural number) are stacked in the rotation axis direction DR <b> 2 of rotor 30. The electromagnetic steel sheet 61 has thick portions 611, 613, 615 and thin portions 612, 614. The thick part 611, 613, 615 and the thin part 612, 614 are arranged in the circumferential direction DR1 of the rotor 30 in the order of the thick part 611, the thin part 612, the thick part 613, the thin part 614, and the thick part 615. . And the thick part 611,613,615 has thickness d1, and the thin part 612,614 has thickness d2. The wall thickness d2 is in the range of 30 to 50% of the wall thickness d1.

  Thus, the thin portions 612 and 614 have a thickness d2 that is thinner than the thick portions 611, 613, and 615. Therefore, the permeability of the thin portions 612 and 614 in the circumferential direction DR1 is the thick portions 611 and 613. It is smaller than the magnetic permeability in the circumferential direction DR1 of 615. This is because, as will be described later, the thin-walled portions 612 and 614 are thinned by striking (striking) the electromagnetic steel sheet from the thickness direction, so that residual stress is generated and the magnetic permeability in the circumferential direction DR1 is reduced.

  Each of the electromagnetic steel plates 62 to 6 n has the same structure as the electromagnetic steel plate 61.

  The holding portion 3A includes n thin portions 612 that are arranged substantially linearly in the rotation axis direction DR2 of the rotor 30, and the holding portion 3B is n that is arranged substantially linearly in the rotation axis direction DR2 of the rotor 30. It consists of a thin portion 614. The magnetic pole portion 3F includes n thick portions 613 arranged substantially linearly in the rotation axis direction DR2 of the rotor 30, and the magnetic pole portion 3G includes n pieces arranged in the rotation axis direction DR2 of the rotor 30. The magnetic pole part 3H is composed of n thick parts 615 arranged substantially linearly in the rotation axis direction DR2 of the rotor 30. As described above, the thin portions 612 and 614 have a smaller magnetic permeability than the thick portions 611, 613, and 615 in the circumferential direction DR1 of the rotor 30, so that the holding portions 3A and 3B are magnetic pole portions 3F and 3F in the circumferential direction DR1. It has a magnetic permeability smaller than 3G and 3H.

  Accordingly, the permanent magnets 5A and 5B are less likely to form a short-circuit magnetic path on the gaps 4A and 4B side through the holding portions 3A and 3B in the circumferential direction DR1 of the rotor 30, and the permanent magnets 5A on the gaps 4A and 4B side. , 5B decreases the short-circuit magnetic flux. Then, the permanent magnets 5A and 5B act as a large magnetic resistance in the d-axis magnetic path, and the magnetic flux easily passes through the magnetic pole portions 3G and 3H where only the ferromagnetic material exists. Then, the d-axis inductance Ld decreases and the q-axis inductance Lq increases. As a result, the salient pole characteristic (Ld <Lq) becomes a large value, and the performance of the electric motor 50 is improved.

  FIGS. 5 to 9 are process diagrams showing the first to fifth steps for manufacturing the rotor 30 shown in FIG. 5 to 9, a plurality of regions 621 to 634, 641 to 654 of a plurality of regions 621 to 634 and 641 to 654 of a magnetic steel sheet 61 having a thickness d1 are struck (struck) from a direction DR3. Is reduced from the thickness d1 to the thickness d2 (see FIG. 5). In this case, the force for striking (striking) the plurality of regions 621 to 634 and 641 to 654 is set between the force at which the electromagnetic steel sheet 61 yields and the force at which the electromagnetic steel sheet 61 breaks.

  The plurality of regions 621 to 634 are regions where the holding portions 3A of the rotor magnetic poles 31 to 44 are formed, respectively, and the plurality of regions 641 to 654 are regions where the holding portions 3B of the rotor magnetic poles 31 to 44 are formed, respectively. is there. That is, in the first step, a plurality of regions are formed by striking (striking) the plurality of regions 621 to 634 and 641 to 654 of the electromagnetic steel sheet 61 where the holding portions 3A and 3B of the rotor magnetic poles 31 to 44 are formed. The thickness of 621-634, 641-654 is made thin.

  As a result, 14 thin portions 612 and 614 for forming the holding portions 3A and 3B of the rotor magnetic poles 31 to 44 are formed in the circumferential direction DR1 (see FIG. 6).

  Thereafter, the electromagnetic steel sheet 61 in which the 14 thin portions 612 and 614 are formed is pressed to produce 14 through holes 681 to 694 on the inner peripheral side of the 14 thin portions 612 and 614 (FIG. 7). reference). The through holes 681 to 694 penetrate the electromagnetic steel sheet 61 in the thickness direction. The through holes 681 to 694 are holes constituting the magnet insertion hole 8 for inserting the permanent magnets 5A and 5B. FIG. 7 shows an enlarged view of a region where the rotor magnetic pole 35 is formed. The through hole 685 is formed so that both ends in the circumferential direction DR1 are in contact with the thin portions 612 and 614, respectively. The through holes 681 to 684 and 686 to 694 are formed so that both ends thereof are in contact with the thin portions 612 and 614, respectively, similarly to the through hole 685.

  And after the through-holes 681-694 are formed in the electromagnetic steel plate 61, the through-hole 680 is formed by press work. The through hole 680 is a hole for inserting the rotating shaft 30 </ b> A of the rotor 30.

  Thereafter, the steps shown in FIG. 5 to FIG. 7 are repeated for the electromagnetic steel sheets 62 to 6n, and the n thin pieces 612, 614, the 14 through holes 681 to 694 and the 1 through hole 680 are formed. Magnetic steel sheets 61 to 6n are produced (FIG. 8). Then, the n electromagnetic steel plates 61 to 6n are arranged in the direction of the rotation axis of the rotor 30 so that the through holes 681 to 694 formed in the electromagnetic steel plate 61 coincide with the through holes 681 to 694 formed in the electromagnetic steel plates 62 to 6n, respectively. The rotor core 60 is manufactured by stacking on the DR 2 (see FIG. 9). That is, the n electromagnetic steel plates 61 to 6n are formed of the rotor 30 so that the n magnet insertion holes 8 are formed by the 14 × n through holes 681 to 694 formed in the n electromagnetic steel plates 61 to 6n. Are stacked in the rotation axis direction DR2. As a result, magnet insertion holes 81 to 94 are formed in the circumferential direction DR1 of the rotor core 60. Each of the magnet insertion holes 81 to 94 corresponds to the magnet insertion hole 8 shown in FIGS.

  When the rotor core 60 is manufactured, the 14 permanent magnets 5A and the 14 permanent magnets 5B are grouped one by one, and the permanent magnet sets 661 to 674 are inserted into the magnet insertion holes 81 to 94, respectively. Insert from direction DR2. Thereby, the rotor 30 in which the rotor magnetic poles 31 to 44 are formed in the circumferential direction DR1 is manufactured.

  When the rotor 30 is manufactured, the electric motor 50 is manufactured by inserting the rotor 30 inside the separately manufactured stator 10.

  In the above description, the holding portions 3A and 3B have been described as forming the thin portions 612 and 614 by thinning the plurality of regions 621 to 634 and 641 to 654 of the electromagnetic steel plates 61 to 6n from both sides of the electromagnetic steel plates. The present invention is not limited to this, and the plurality of regions 621 to 634 and 641 to 654 may be thinned from any one of the electromagnetic steel plates to form the thin portions 612 and 614 constituting the holding portions 3A and 3B. In this case, one surface of the electromagnetic steel sheets 61 to 6n is flat, and the other surface has a structure in which the peripheral portion is periodically uneven in the circumferential direction DR1. And the electromagnetic steel plates 61-6n are laminated | stacked on the rotating shaft direction DR2 of the rotor 30, and the rotor core 60 so that the part where flat surfaces contact between two electromagnetic steel plates and the part where uneven | corrugated surfaces contact may be formed alternately. Is produced.

  In the present invention, the holding portions 3A and 3B hold the “first magnet holding portion” and the “second” holding the permanent magnets 5A and 5B against the centrifugal force of the permanent magnets 5A and 5B based on the rotation of the rotor 30. The magnet holding part of each is comprised.

  Further, in each of the electromagnetic steel sheets 61 to 6n, the 14 thin portions 612 constitute “a plurality of first thin portions”, and the 14 thin portions 614 constitute “a plurality of second thin portions”. Constitute.

  Furthermore, in each of the electromagnetic steel sheets 61 to 6n, the plurality of regions 621 to 634 constitute “a plurality of first regions”, and the plurality of regions 641 to 654 constitute “a plurality of second regions”. .

  As described above, the electric motor according to the first embodiment includes the rotor having a plurality of rotor magnetic poles in the circumferential direction, and each of the plurality of rotor magnetic poles is disposed at both ends of the two permanent magnets and the two permanent magnets, respectively. Two holding parts for holding two permanent magnets, and the two holding parts are made of an electromagnetic steel sheet having a smaller thickness than the other parts (the electromagnetic steel sheet having a normal thickness). Permeability in the circumferential direction of the magnet becomes smaller than the permeability of the other part (a magnetic steel sheet having a normal wall thickness), and the permanent magnet is less likely to form a short-circuit magnetic path on the two holding part sides, and the two holdings The part opposes the centrifugal force of the magnet based on the rotation of the rotor. And the short circuit magnetic flux in the two holding | maintenance part sides is reduced, and the centrifugal force resistance with respect to a permanent magnet is ensured.

  Therefore, the short circuit magnetic flux in the two holding | maintenance part sides can be reduced, and the centrifugal-resistant ability with respect to two permanent magnets can be ensured. As a result, the performance of the electric motor can be improved while maintaining the holding force of the permanent magnet.

[Embodiment 2]
FIG. 10 is a plan view of the electric motor according to the second embodiment viewed from the direction of the rotation axis. Referring to FIG. 10, electric motor 50 </ b> A according to the second embodiment is the same as electric motor 50 except that rotor 30 of electric motor 50 is replaced with rotor 300.

  The rotor 300 is disposed on the inner peripheral side of the stator 10 with a gap GAP therebetween. The rotor 300 has rotor magnetic poles 301 to 314 in the circumferential direction DR1.

  When the rotor 300 receives magnetic force from the stator magnetic poles 11 to 24 of the stator 10 to the rotor magnetic poles 301 to 314, the rotor 300 rotates around the rotation shaft 300A. Then, the electric motor 50A outputs a predetermined torque from the rotary shaft 300A.

  FIG. 11 is an enlarged view of the region B shown in FIG. 12 is an enlarged view of the magnetic pole portion 3F, the holding portions 31A and 31B, and the magnet insertion hole 8 shown in FIG. Referring to FIG. 11, rotor 300 has a rotor core 600. The rotor core 600 has a magnet insertion hole 8. And permanent magnet 5A, 5B is inserted in the magnet insertion hole 8 from the rotating shaft direction (direction perpendicular | vertical to a paper surface) of the rotor 300. FIG.

  The rotor magnetic pole 301 is the same as the rotor magnetic pole 31 except that the holding portions 3A and 3B of the rotor magnetic pole 31 of the electric motor 50 are replaced with holding portions 31A and 31B, respectively. The holding portions 31A and 31B have a structure in which a magnetic steel sheet is twisted around an axis AX connecting the holding portion 31A and the holding portion 31B.

  Each of the rotor magnetic poles 302 to 314 has the same configuration as the rotor magnetic pole 301.

  FIG. 13 is a plan view of the holding portions 31A and 31B and the magnetic pole portions 3F, 3G, and 3H constituting the single rotor magnetic pole 301 shown in FIG. Referring to FIG. 13, rotor core 600 has a structure in which electromagnetic steel plates 601 to 60 n are stacked in the rotational axis direction DR <b> 2 of rotor 300. The electromagnetic steel plate 601 has flat portions 616, 618, 620 and twisted portions 617, 619. The flat portions 616, 618, 620 and the twist portions 617, 619 are arranged in the circumferential direction DR1 of the rotor 300 in the order of the flat portion 616, the twist portion 617, the flat portion 618, the twist portion 619, and the flat portion 620. The flat portions 616, 618, 620 and the twist portions 617, 619 have the same thickness d1.

  Since the twisted portions 617 and 619 have a structure in which the electromagnetic steel plate 601 is twisted, the magnetic permeability in the circumferential direction DR1 of the twisted portions 617 and 619 is smaller than the magnetic permeability in the circumferential direction DR1 of the flat portions 616, 618 and 620. That is, in the twisted portions 617 and 619, the residual stress increases due to the twisting of the magnetic steel sheet, and the magnetic permeability decreases.

  Each of the electromagnetic steel plates 602 to 60n has the same structure as the electromagnetic steel plate 601.

  The holding portion 31A is composed of n twisted portions 617 arranged substantially linearly in the rotation axis direction DR2 of the rotor 600, and the holding portion 31B is n arranged substantially linearly in the rotation axis direction DR2 of the rotor 300. It consists of a single twisted portion 619. The magnetic pole portion 3F includes n flat portions 618 arranged substantially linearly in the rotation axis direction DR2 of the rotor 300, and the magnetic pole portion 3G is arranged substantially linearly in the rotation axis direction DR2 of the rotor 300. The magnetic pole portion 3H is composed of n flat portions 620 arranged substantially linearly in the rotation axis direction DR2 of the rotor 300.

  As described above, the twisted portions 617 and 619 have a magnetic permeability smaller than that of the flat portions 616, 618, and 620. Therefore, the holding portions 31A and 31B have a magnetic permeability smaller than that of the magnetic pole portions 3F, 3G, and 3H in the circumferential direction DR1. Have

  Therefore, as described above, the permanent magnets 5A and 5B are difficult to form a short-circuit magnetic path on the side of the air gaps 4A and 4B through the holding portions 31A and 31B in the circumferential direction DR1 of the rotor 300, respectively. The short-circuit magnetic flux from the permanent magnets 5A and 5B on the side decreases. Then, the permanent magnets 5A and 5B act as a large magnetic resistance in the d-axis magnetic path, and the magnetic flux easily passes through the magnetic pole portions 3G and 3H where only the ferromagnetic material exists. Then, the d-axis inductance Ld decreases and the q-axis inductance Lq increases. As a result, the salient pole characteristic (Ld <Lq) becomes a large value, and the performance of the electric motor 50A is improved.

  Moreover, since the torsion parts 617 and 619 have the same thickness d1 as the flat parts 616, 618 and 620, the holding parts 31A and 31B can secure the centrifugal resistance against the permanent magnets 5A and 5B, respectively.

  14 to 16 are process diagrams showing a first process to a third process for manufacturing the rotor 300 shown in FIG. 10, respectively. 14 to 16, the plurality of regions 621 to 634 and 641 to 654 of the electromagnetic steel sheet 601 having the wall thickness d1 are determined (see FIG. 14), and the region among the plurality of regions 621 to 634 and 641 to 654 is determined. The peripheral side is pressed to form through holes 681 to 694 in the circumferential direction DR1 (see FIG. 15).

  And the area | regions 661-674 of the outer peripheral side of the through-holes 681-694 are twisted at least 1 rotation to the outer side of the electromagnetic steel plate 601. FIG. That is, the plurality of regions 661 to 674 are twisted at least once around an axis connecting the regions 621 and 641, the regions 622 and 642,..., The regions 634 and 654. Thereby, the torsion part 617,619 is formed in each both ends of the through-holes 681-694 (refer FIG. 16).

  Thereafter, the through hole 680 is formed by press working. The through hole 680 is a hole for inserting the rotary shaft 300 </ b> A of the rotor 300.

  And the process shown in FIGS. 14-16 is repeated about the electromagnetic steel plates 602-60n, and the n electromagnetic steel plates in which the 14 twist parts 617 and 619, the 14 through-holes 681-694, and the through-hole 680 were formed. 601-60n are produced.

  When n electromagnetic steel sheets 601 to 60n are produced, the rotor 300 is produced according to the steps shown in FIGS. When the rotor 300 is manufactured, the electric motor 50A is manufactured by inserting the rotor 300 inside the separately manufactured stator 10.

  In the present invention, the holding portions 31A, 31B hold the “first magnet holding portion” and the “second” holding the permanent magnets 5A, 5B against the centrifugal force of the permanent magnets 5A, 5B based on the rotation of the rotor 300. The magnet holding part of each is comprised.

  Further, in each of the electromagnetic steel sheets 601 to 60n, the 14 twisted portions 617 constitute “a plurality of first twisted portions”, and the 14 twisted portions 619 represent “a plurality of second twisted portions”. Constitute.

  Others are the same as in the first embodiment.

  As described above, the electric motor according to the second embodiment includes a rotor having a plurality of rotor magnetic poles in the circumferential direction, and each of the plurality of rotor magnetic poles is disposed at both ends of the two permanent magnets and the two permanent magnets. 2 holding parts for holding two permanent magnets, and the two holding parts have a structure in which the electromagnetic steel sheet is twisted and have the same thickness as the other parts (non-twisted electromagnetic steel sheet). The permeability in the circumferential direction of the two holding parts becomes smaller than the permeability of the other part (untwisted electrical steel sheet), and the permanent magnet is less likely to form a short-circuit magnetic path on the two holding part sides, and the two holding parts The part opposes the centrifugal force of the magnet based on the rotation of the rotor. And the short circuit magnetic flux in the two holding | maintenance part sides is reduced, and the centrifugal force resistance with respect to a permanent magnet is ensured.

  Therefore, the short circuit magnetic flux in the two holding | maintenance part sides can be reduced, and the centrifugal-resistant ability with respect to two permanent magnets can be ensured. As a result, the performance of the electric motor can be improved while maintaining the holding force of the permanent magnet.

[Embodiment 3]
FIG. 17 is a plan view of the electric motor according to the third embodiment viewed from the direction of the rotation axis. Referring to FIG. 17, electric motor 50 </ b> B according to Embodiment 3 is the same as electric motor 50 except that rotor 30 of electric motor 50 is replaced with rotor 400.

  The rotor 400 is disposed on the inner peripheral side of the stator 10 with a gap GAP therebetween. The rotor 400 has rotor magnetic poles 401 to 414 in the circumferential direction DR1.

  When the rotor 400 receives a magnetic force from the stator magnetic poles 11 to 24 of the stator 10 to the rotor magnetic poles 401 to 414, the rotor 400 rotates around the rotation shaft 400A. Then, the electric motor 50B outputs a predetermined torque from the rotating shaft 400A.

  18 is an enlarged view of a region C shown in FIG. Referring to FIG. 18, rotor 400 has a rotor core 700. The rotor core 700 has a magnet insertion hole 8. And permanent magnet 5A, 5B is inserted in the magnet insertion hole 8 from the rotating shaft direction (direction perpendicular | vertical to a paper surface) of the rotor 400. FIG.

  The rotor magnetic pole 401 is the same as the rotor magnetic pole 31 except that the holding portions 3A and 3B of the rotor magnetic pole 31 of the electric motor 50 are replaced with holding portions 32A and 32B, respectively. The holding portions 32A and 32B are an electromagnetic steel plate having an easy axis direction in a direction substantially perpendicular to the circumferential direction DR1 of the rotor 400, an electromagnetic steel plate containing carbon (C), and an electromagnetic steel plate containing nitrogen (N). It consists of any one of.

  Each of the rotor magnetic poles 402 to 414 has the same configuration as the rotor magnetic pole 401.

(1) In the case where the holding portions 32A and 32B are made of an electromagnetic steel plate having an easy axis direction in a direction substantially perpendicular to the circumferential direction DR1 of the rotor 400. FIG. 19 shows a holding portion constituting one rotor magnetic pole 401 shown in FIG. It is the top view seen from the outer peripheral side of the rotor 400 of 32A, 32B and magnetic pole part 3F, 3G, 3H. Referring to FIG. 19, rotor core 700 has a structure in which electromagnetic steel plates 701 to 70 n are stacked in the rotational axis direction DR <b> 2 of rotor 400. The electromagnetic steel plate 701 includes easy axis maintaining units 711, 713, 715 and easy axis changing units 712, 714. The easy axis maintaining units 711, 713, 715 and the easy axis changing units 712, 714 are an easy axis maintaining unit 711, an easy axis changing unit 712, an easy axis maintaining unit 713, an easy axis changing unit 714, and They are arranged in the circumferential direction DR1 of the rotor 400 in the order of the easy magnetization maintaining section 715. And the easy axis maintenance parts 711, 713, 715 and the easy axis change parts 712, 714 have the same thickness d1.

  The easy-magnetization axis maintaining units 711, 713, and 715 maintain the easy-magnetization axis that the magnetic steel sheet 701 originally has. The easy axis changing units 712 and 714 have easy axes in a direction substantially perpendicular to the circumferential direction DR1 of the rotor 400. More specifically, the easy-magnetization axis changing units 712 and 714 have an easy-magnetization axis in the radial direction of the rotor 400 (direction perpendicular to the paper surface) or the thickness direction of the electromagnetic steel sheet 701 (rotational axis direction DR2 of the rotor 400). Have. As a result, the easy axis changing units 712 and 714 have a smaller magnetic permeability than the easy axis maintaining units 711, 713 and 715 in the circumferential direction DR 1 of the rotor 400.

  Each of the electromagnetic steel plates 702 to 70n has the same structure as the electromagnetic steel plate 701.

  The holding part 32A is composed of n easy-magnetization axis changing parts 712 arranged substantially linearly in the rotation axis direction DR2 of the rotor 400, and the holding part 32B is arranged substantially linearly in the rotation axis direction DR2 of the rotor 400. N magnetized easy axis changing units 714. The magnetic pole part 3F is composed of n easy-magnetization axis maintaining parts 713 arranged substantially linearly in the rotation axis direction DR2 of the rotor 400, and the magnetic pole part 3G is substantially linear in the rotation axis direction DR2 of the rotor 400. The magnetic pole part 3H is composed of n easy magnetization axis maintaining parts 715 arranged substantially linearly in the rotation axis direction DR2 of the rotor 400.

  As described above, since the easy axis changing units 712 and 714 have a smaller magnetic permeability than the easy axis maintaining units 711, 713, and 715 in the circumferential direction DR1, the holding units 32A and 32B are magnetic poles in the circumferential direction DR1. It has a smaller magnetic permeability than the parts 3F, 3G, 3H.

  Therefore, as described above, the permanent magnets 5A and 5B are difficult to form a short-circuit magnetic path on the side of the air gaps 4A and 4B through the holding portions 32A and 32B in the circumferential direction DR1 of the rotor 400, respectively. The short-circuit magnetic flux from the permanent magnets 5A and 5B on the side decreases. Then, the permanent magnets 5A and 5B act as a large magnetic resistance in the d-axis magnetic path, and the magnetic flux easily passes through the magnetic pole portions 3G and 3H where only the ferromagnetic material exists. Then, the d-axis inductance Ld decreases and the q-axis inductance Lq increases. As a result, the salient pole characteristic (Ld <Lq) becomes a large value, and the performance of the electric motor 50B is improved.

  Moreover, since the easy-magnetization-axis changing parts 712 and 714 have the same thickness d1 as the easy-magnetization axis maintaining parts 711, 713 and 715, the holding parts 32A and 32B are resistant to centrifugal force with respect to the permanent magnets 5A and 5B, respectively. Can be secured.

  20 and 21 are process diagrams respectively showing a first process and a second process for manufacturing the rotor 400 shown in FIG. 20 and 21, a plurality of regions 621 to 634 and 641 to 654 of the electromagnetic steel sheet 701 having the wall thickness d1 are determined, and the plurality of regions 621 to 634 and 641 to 654 are determined to have a predetermined pressure and a predetermined value. Process at temperature (see FIG. 20).

  More specifically, pressure is applied to the plurality of regions 621 to 634 and 641 to 654 by the mold 100, and the plurality of regions 621 to 634 and 641 to 654 are heated to 1200 ° C. by the laser beam LB. The mold 100 includes pressing portions 101 to 114 and 121 to 134 (in FIG. 20, only the pressing portions 102 to 104, 108, and 121 to 124 are shown). And the press parts 101-114, 121-134 are provided corresponding to the some area | region 621-634, 641-654 of the electromagnetic steel plate 701, respectively. Therefore, the mold 100 is placed on the electromagnetic steel sheet 701 so that the pressing portions 101 to 114 and 121 to 134 are in contact with the plurality of regions 621 to 634 and 641 to 654, respectively, and the mold 100 is moved from the thickness direction of the electromagnetic steel sheet 701 to the mold 100. A predetermined pressure is applied to the plurality of regions 621 to 634 and 641 to 654 by applying the pressure.

  Further, the laser beam LB is irradiated in the order of the regions 621, 641, 622, 642,... From the outer peripheral side of the electromagnetic steel plate 701, and the plurality of regions 621 to 634, 641 to 654 are heated to 1200 ° C.

  Thereby, the plurality of regions 621 to 634 and 641 to 654 are recrystallized, and the easy magnetization axis is changed to a direction substantially orthogonal to the circumferential direction DR1 of the rotor 400. More specifically, in the plurality of regions 621 to 634 and 641 to 654, the easy magnetization axis is changed in the radial direction of the rotor 400 or the thickness direction of the electromagnetic steel sheet 701 (rotational axis direction DR2 of the rotor 400).

  As a result, 14 easy-magnetization axis changing portions 712 and 714 are formed. And the through-holes 681-694 are formed in the circumferential direction DR1 so that the inner peripheral side of 14 easy-magnetization-axis changing parts 712 and 714 may be press-processed, and both ends may contact the easy-magnetization axis changing parts 712 and 714, respectively. Further, a through hole 680 is formed (see FIG. 21).

  And about the electromagnetic steel plates 702-70n, the process shown in FIG. 20 and FIG. 21 was repeated, and 14 easy-magnetization axis changing parts 712 and 714, 14 through-holes 681-694 and one through-hole 680 were formed. N pieces of electromagnetic steel sheets 701 to 70n are produced.

  When n electromagnetic steel sheets 701 to 70n are produced, the rotor 400 is produced according to the steps shown in FIGS. When the rotor 400 is manufactured, the rotor 50 is inserted inside the separately manufactured stator 10 to manufacture the electric motor 50B.

(2) When the holding portions 32A and 32B are made of magnetic steel sheets containing impurities FIG. 22 shows the rotor 400 of the holding portions 32A and 32B and the magnetic pole portions 3F, 3G, and 3H constituting one rotor magnetic pole 401 shown in FIG. It is the other top view seen from the outer peripheral side. Referring to FIG. 22, rotor core 700 has a structure in which electromagnetic steel plates 701 to 70 n are stacked in the rotational axis direction DR <b> 2 of rotor 400. When the holding parts 32A and 32B are made of electromagnetic steel sheets containing impurities, the electromagnetic steel sheet 701 has pure parts 721, 723, 725 and impurity-containing parts 722,724. The pure parts 721, 723, 725 and the impurity containing parts 722, 724 are arranged in the circumferential direction DR1 of the rotor 400 in the order of the pure part 721, the impurity containing part 722, the pure part 723, the impurity containing part 724, and the pure part 725. . The pure parts 721, 723, 725 and the impurity containing parts 722, 724 have the same thickness d1.

  The pure parts 721, 723, and 725 are made of electromagnetic steel sheets that do not contain impurities. Impurity containing part 722,724 consists of a magnetic steel sheet containing carbon (C) or nitrogen (N). As a result, the impurity containing portions 722 and 724 have a smaller magnetic permeability than the pure portions 721, 723, and 725.

  Each of the electromagnetic steel plates 702 to 70n has the same structure as the electromagnetic steel plate 701 shown in FIG.

  The holding part 32A is composed of n impurity-containing parts 722 arranged substantially linearly in the rotation axis direction DR2 of the rotor 400, and the holding part 32B is arranged substantially linearly in the rotation axis direction DR2 of the rotor 400. It consists of n impurity-containing portions 724. The magnetic pole part 3F is composed of n pure parts 723 arranged substantially linearly in the rotation axis direction DR2 of the rotor 400, and the magnetic pole part 3G is arranged substantially linearly in the rotation axis direction DR2 of the rotor 400. The magnetic pole portion 3H is composed of n pure portions 725 arranged substantially linearly in the rotation axis direction DR2 of the rotor 400.

  As described above, since the impurity containing parts 722 and 724 have a smaller magnetic permeability than the pure parts 721, 723 and 725, the holding parts 32A and 32B have a smaller magnetic permeability than the magnetic pole parts 3F, 3G and 3H. .

  Therefore, as described above, the permanent magnets 5A and 5B are difficult to form a short-circuit magnetic path on the side of the air gaps 4A and 4B through the holding portions 32A and 32B in the circumferential direction DR1 of the rotor 400, respectively. The short-circuit magnetic flux from the permanent magnets 5A and 5B on the side decreases. Then, the permanent magnets 5A and 5B act as a large magnetic resistance in the d-axis magnetic path, and the magnetic flux easily passes through the magnetic pole portions 3G and 3H where only the ferromagnetic material exists. Then, the d-axis inductance Ld decreases and the q-axis inductance Lq increases. As a result, the salient pole characteristic (Ld <Lq) becomes a large value, and the performance of the electric motor 50B is improved.

  Moreover, since the impurity containing parts 722 and 724 have the same thickness d1 as the pure parts 721, 723, and 725, the holding parts 32A and 32B can secure the centrifugal resistance against the permanent magnets 5A and 5B, respectively.

  23 to 25 are process diagrams respectively showing first to third steps for manufacturing the rotor 400 shown in FIG. 17 when the holding parts 32A and 32B are formed of the impurity containing parts 722 and 724 shown in FIG. . Referring to FIGS. 23 to 25, flat magnetic steel sheet 140 has a thickness d1. The flat electromagnetic steel sheet 140 has a hole 141 formed continuously in the direction of the arrow 6 at one end and a hole 142 at the other end (see FIG. 23A). These holes 141 and 142 specify each position on the flat electromagnetic steel sheet 140 when the flat electromagnetic steel sheet 140 is moved in the direction of arrow 6 and the flat electromagnetic steel sheet 140 is moved in the direction of arrow 6. It is a hole to make it possible. That is, the holes 141 and 142 are holes that make it possible to specify a region to be processed in each process when the flat electromagnetic steel sheet 140 is processed by a flow operation.

  The flat electromagnetic steel sheet 140 is moved in the direction of the arrow 6 to determine a region 143 for cutting out the electromagnetic steel sheet 701 for producing the rotor core 700. Then, in the region 143, regions 151 to 164 and 171 to 184 in which 14 impurity-containing portions 722 and 724 are to be formed are determined. In this case, the regions 151 to 164 are regions where the 14 impurity-containing portions 722 are formed, and the regions 171 to 184 are regions where the 14 impurity-containing portions 724 are formed.

Thereafter, a laser beam is irradiated while carbon dioxide (CO ₂ ) gas is blown onto the determined regions 151 to 164 and 171 to 184. More specifically, the laser beam is irradiated while CO ₂ gas is blown in the order of the regions 151, 171, 152, 172,. By irradiation with the laser beam, the regions 151 to 164 and 171 to 184 are heated to about 1200 ° C., and carbon (C) decomposed from CO ₂ gas is injected into the electromagnetic steel sheet ((( b)). This is performed with respect to the area | region which cuts out the electromagnetic steel plates 702-70n. Then, the electromagnetic steel plates 701 to 70n each having 14 impurity-containing portions 722 and 724 are cut out from the flat electromagnetic steel plate 140 (see FIG. 23C).

  As described above, in the process shown in FIG. 23, when the n electromagnetic steel plates 701 to 70 n each having 14 impurity-containing portions 722 and 724 are formed, the n electromagnetic steel plates 701 to 70 n are cut. This is a pretreatment process in which impurities (C) are injected into the region where the 14 impurity-containing portions 722 and 724 are formed at the stage of the flat electromagnetic steel sheet 140 before being put out.

  When the pretreatment step is completed, 14 impurity-containing portions 722 and 724 are formed on the electromagnetic steel sheet 701 (see FIG. 24). Then, the inner peripheral sides of the 14 impurity-containing portions 722 and 724 are pressed to form through holes 681 to 694 in the circumferential direction DR1 so that both end portions are in contact with the impurity-containing portions 722 and 724, respectively, A hole 680 is formed (see FIG. 25).

  And about the electromagnetic steel sheets 702-70n, the process shown in FIG.24 and FIG.25 is repeated, and the n sheet | seat in which the 14 impurity containing parts 722 and 724, the 14 through-holes 681-694, and the 1 through-hole 680 were formed. Magnetic steel sheets 701 to 70n are produced.

  When n electromagnetic steel sheets 701 to 70n are produced, the rotor 400 is produced according to the steps shown in FIGS. When the rotor 400 is manufactured, the rotor 50 is inserted inside the separately manufactured stator 10 to manufacture the electric motor 50B.

  In addition, when the holding portions 32A and 32B include the impurity containing portions 722 and 724 shown in FIG. 22, the rotor 400 shown in FIG. 17 may be manufactured through the steps shown in FIGS. 26 and 27 are process diagrams showing another process of manufacturing the rotor 400 shown in FIG. 17 when the holding parts 32A and 32B are formed of the impurity containing parts 722 and 724 shown in FIG.

  With reference to FIG. 26 and FIG. 27, a plurality of electromagnetic steel plates 701 to 70n are cut out from the flat electromagnetic steel plate 140 shown in FIG. 23, and a plurality of regions 621 to 634 in each of the cut out electromagnetic steel plates 701 to 70n. , 641 to 654 are press-worked to form through holes 681 to 694 in the circumferential direction DR1 so that both ends thereof are in contact with the regions 621, 641; 622, 642,. 680 is formed (see FIG. 26).

And the rotor core 700 is produced by laminating a plurality of electromagnetic steel plates 701 to 70n in which the through hole 680 and the through holes 681 to 694 are formed (see FIG. 27). In this case, magnet insertion holes 81 to 94 are formed by n × 14 through holes 681 to 694, respectively. Thereafter, the laser beam LB is irradiated while CO ₂ gas GS is blown from the pipe 150 to the plurality of regions 621 to 634 and 641 to 654. Then, the pipe 150 and the laser beam LB are alternately moved in the direction of the arrow 90 </ b> A and the direction of the arrow 91 </ b> A to form 14 impurity-containing portions 722 and 724 in the entire rotor core 700.

  Thereafter, the rotor 400 is formed according to the process shown in FIG. When the rotor 400 is manufactured, the rotor 50 is inserted inside the separately manufactured stator 10 to manufacture the electric motor 50B.

  As described above, the 14 impurity-containing portions 722 and 724 may be formed after the n electromagnetic steel plates 701 to 70n are stacked.

In the description of FIGS. 23 to 27, the case where carbon (C) is implanted as an impurity has been described. However, in the present invention, nitrogen (N) may be implanted as an impurity. In this case, nitrogen (N ₂ ) gas is used instead of CO ₂ gas. Others are as described above.

  In the above description, it has been described that the temperature of the magnetic steel sheets 701 to 70n is increased by the laser beam LB and carbon (C) or nitrogen (N) is injected. In the present invention, carbon (C) or nitrogen (N) is used. May be implanted into the plurality of regions 621 to 634 and 641 to 654 of the electromagnetic steel sheets 701 to 70n by an ion implantation method.

  Furthermore, when the holding portions 32A and 32B are formed of the impurity-containing portions 722 and 724 shown in FIG. 22, the rotor 400 shown in FIG. 17 may be manufactured through the process shown in FIG. FIG. 28 is a process diagram showing still another process for manufacturing the rotor 400 shown in FIG. 17 when the holding parts 32A and 32B include the impurity-containing parts 722 and 724 shown in FIG.

  Referring to FIG. 28, the flat magnetic steel sheet 140 described in FIG. 23 is prepared (see FIG. 28A). Then, the flat electromagnetic steel plate 140 is moved in the direction of the arrow 6 to determine the region 143 for cutting out the electromagnetic steel plate 701 for producing the rotor core 700. Thereafter, in the region 143, the regions 151 to 164 and 171 to 184 where the 14 impurity-containing portions 722 and 724 are to be formed are determined.

  Then, the solid powder 190 made of carbon (C) is placed on the determined regions 151 to 164 and 171 to 184, and a laser beam is irradiated. More specifically, 28 solid powders 190 are placed on the regions 151 to 164 and 171 to 184, respectively, and the laser beams are irradiated in the order of the regions 151, 171, 152, 172,. In this case, the power of the laser beam is set to a power that raises the temperature to 1500 ° C. to 1600 ° C. at which the electromagnetic steel sheet melts.

  Thereby, the solid powder 190 is melted, and carbon (C) is injected into the plurality of regions 151 to 164 and 171 to 184 (see FIG. 28B).

  Thereafter, in each of the plurality of regions 151 to 164 and 171 to 184, holes 210 and 220 are formed by pressing on both sides of the melted portion 200 where the solid powder 190 is dissolved (see FIG. 28C). In this case, the hole 210 is formed on the outer peripheral side of the circular region 143 shown in FIG. 28B, and the hole 220 is formed on the inner peripheral side.

  A cross-sectional structure between lines DD shown in FIG. 28C is as shown in FIG. That is, the melting part 200 is raised higher than the surface of the flat electromagnetic steel sheet 140. Therefore, the molten part 200A having the same thickness as the flat magnetic steel sheet 140 is produced by hitting the molten part 200 (see FIG. 28E). In this case, the portion raised higher than the flat electromagnetic steel sheet 140 escapes in the direction of the holes 210 and 220. Then, steps (c) to (e) in FIG. 28 are performed in each of the plurality of regions 151 to 164 and 171 to 184.

  In this state, the melting portion 200A exists in each of the plurality of regions 151 to 164 and 171 to 184 shown in FIG. That is, 28 melted parts 200A exist in a circle.

  FIG. 29 is a plan view showing a part of the region 143 when the step shown in FIG. After the step shown in FIG. 28 (e), a plurality of electromagnetic steel plates 701 to 70n are cut out from the flat electromagnetic steel plate 140. The cutting method is as shown in FIG. 29 in the arrangement direction of the holes 210 and 220. A plurality of electromagnetic steel sheets 701 to 70n are cut out from the flat electromagnetic steel sheet 140 so that the peripheral edge 230 passes through the middle of the melting part 200A (see FIG. 28 (f)).

  Thereafter, the rotor 400 is manufactured according to the steps shown in FIGS. In each of the plurality of electromagnetic steel sheets 701 to 70n, when the through holes 681 to 694 are formed, the through holes 681 to 694 are formed using the holes 220 remaining on the inner peripheral side of the melting portion 200A. And when the rotor 400 is produced by laminating a plurality of electromagnetic steel plates 701 to 70n, the rotor 400 is inserted inside the separately produced stator 10 to produce the electric motor 50B.

  In FIG. 28B, when the solid powder 190 is melted, carbon (C) may be injected by melting the solid powder 190 by hot pressing instead of the irradiation with the laser beam LB.

  As described above, by injecting carbon (C) or nitrogen (N) into the region where the holding portions 32A and 32B are formed by various methods, the magnetic permeability of the holding portions 32A and 32B is changed to the magnetic pole portions 3F, 3G, It can be made smaller than the magnetic permeability of 3H.

  In the present invention, the holding portions 32A, 32B hold the “first magnet holding portion” and the “second” holding the permanent magnets 5A, 5B against the centrifugal force of the permanent magnets 5A, 5B based on the rotation of the rotor 400. The magnet holding part of each is comprised.

  In each of the electrical steel sheets 701 to 70n, the 14 easy axis change units 712 constitute “a plurality of first easy axis change units”, and the 14 easy axis change units 714 include “ A plurality of second easy-magnetization-axis changing units ”are configured.

  Furthermore, in each of the electromagnetic steel sheets 701 to 70n, the 14 impurity-containing portions 722 constitute “a plurality of first impurity-containing portions”, and the 14 impurity-containing portions 724 include “a plurality of second impurities”. Containing part ".

  Others are the same as in the first embodiment.

  As described above, the electric motor according to the third embodiment includes the rotor having a plurality of rotor magnetic poles in the circumferential direction, and each of the plurality of rotor magnetic poles is disposed at both ends of the two permanent magnets and the two permanent magnets, respectively. Two holding parts for holding two permanent magnets, and the two holding parts are made of a magnetic steel sheet having an easy magnetization axis in a direction substantially perpendicular to the circumferential direction of the rotor, and the other part (the easy magnetization axis is The magnetic permeability in the circumferential direction of the two holding portions is smaller than the permeability of the other portion (the electromagnetic steel plate in which the easy axis of magnetization is not changed). The short-circuit magnetic flux on the two holding portions can be reduced, and the centrifugal force resistance against the two permanent magnets can be ensured. As a result, the performance of the electric motor can be improved while maintaining the holding force of the permanent magnet.

  The electric motor according to the third embodiment includes a rotor having a plurality of rotor magnetic poles in the circumferential direction, and each of the plurality of rotor magnetic poles is disposed at both ends of two permanent magnets and two permanent magnets. Two holding parts for holding a permanent magnet, and the two holding parts are made of a magnetic steel sheet containing carbon or nitrogen, and have the same thickness as other parts (electrical steel sheets not containing carbon or nitrogen), The magnetic permeability in the circumferential direction of the two holding parts becomes smaller than the magnetic permeability of the other part (electrical steel sheet not containing carbon or nitrogen), and it becomes difficult for the permanent magnet to form a short-circuit magnetic path on the two holding part sides. The two holding parts oppose the centrifugal force of the magnet based on the rotation of the rotor. And the short circuit magnetic flux in the two holding | maintenance part sides is reduced, and the centrifugal force resistance with respect to a permanent magnet is ensured.

  Therefore, the short circuit magnetic flux in the two holding | maintenance part sides can be reduced, and the centrifugal-resistant ability with respect to two permanent magnets can be ensured. As a result, the performance of the electric motor can be improved while maintaining the holding force of the permanent magnet.

  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 is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

  The present invention is applied to an electric motor capable of reducing a short-circuit magnetic flux of a magnet and ensuring centrifugal resistance, or a manufacturing method thereof.

It is the top view seen from the rotating shaft direction of the electric motor by Embodiment 1 of this invention. It is an enlarged view of the area | region A shown in FIG. It is a top view of the magnet insertion hole in which the permanent magnet shown in FIG. 2 is inserted. It is the top view seen from the outer peripheral side of the rotor of the holding | maintenance part and magnetic pole part which comprise one rotor magnetic pole shown in FIG. It is process drawing which shows the 1st process which manufactures the rotor shown in FIG. It is process drawing which shows the 2nd process which manufactures the rotor shown in FIG. It is process drawing which shows the 3rd process which manufactures the rotor shown in FIG. It is process drawing which shows the 4th process which manufactures the rotor shown in FIG. It is process drawing which shows the 5th process which manufactures the rotor shown in FIG. FIG. 6 is a plan view of the electric motor according to Embodiment 2 as viewed from the direction of the rotation axis. It is an enlarged view of the area | region B shown in FIG. It is an enlarged view of the magnetic pole part, holding | maintenance part, and magnet insertion hole which are shown in FIG. It is the top view seen from the outer peripheral side of the rotor of the holding | maintenance part and magnetic pole part which comprise one rotor magnetic pole shown in FIG. It is process drawing which shows the 1st process which manufactures the rotor shown in FIG. It is process drawing which shows the 2nd process which manufactures the rotor shown in FIG. It is process drawing which shows the 3rd process of manufacturing the rotor shown in FIG. FIG. 6 is a plan view of the electric motor according to Embodiment 3 as viewed from the direction of the rotation axis. It is an enlarged view of the area | region C shown in FIG. It is the top view seen from the outer peripheral side of the rotor of the holding | maintenance part and magnetic pole part which comprise one rotor magnetic pole shown in FIG. FIG. 18 is a process diagram showing a first process for manufacturing the rotor shown in FIG. 17. FIG. 18 is a process diagram showing a second process for manufacturing the rotor shown in FIG. 17. It is the other top view seen from the outer peripheral side of the rotor of the holding | maintenance part and magnetic pole part which comprise one rotor magnetic pole shown in FIG. It is process drawing which shows the 1st process of manufacturing the rotor shown in FIG. 17 when a holding | maintenance part consists of a sequential thing containing part shown in FIG. It is process drawing which shows the 2nd process which manufactures the rotor shown in FIG. 17 when a holding | maintenance part consists of a sequential thing containing part shown in FIG. It is process drawing which shows the 3rd process of manufacturing the rotor shown in FIG. 17 when a holding | maintenance part consists of a sequential thing containing part shown in FIG. It is process drawing which shows another process of manufacturing the rotor shown in FIG. 17 when a holding | maintenance part consists of a sequential thing containing part shown in FIG. It is process drawing which shows another process of manufacturing the rotor shown in FIG. 17 when a holding | maintenance part consists of a sequential thing containing part shown in FIG. It is process drawing which shows another process of manufacturing the rotor shown in FIG. 17 when a holding | maintenance part consists of a sequential thing containing part shown in FIG. It is a top view which shows a part of area | region 143 when the process shown to (e) of FIG. 28 is complete | finished.

Explanation of symbols

  1 magnetic pole part, 2 coils, 3 rotor core part, 3A, 3B, 3C, 3D, 3E, 31A, 31B, 32A, 32B holding part, 3F, 3G, 3H magnetic pole part, 4A, 4B, 4C gap, 5A, 5B permanent Magnet, 6, 90A, 91A Arrow, 8, 81-94 Magnet insertion hole, 8A opening, 10 Stator, 10A Stator core, 11-24 Stator magnetic pole, 30, 300, 400 Rotor, 30A, 300A, 400A Rotating shaft, 31 -44, 301-314, 401-414 Rotor magnetic pole, 60, 600, 700 Rotor core, 50, 50A, 50B Electric motor, 61-6n, 601-60n, 701-70n Electrical steel sheet, 100 mold, 101-114, 121 ~ 134 Pressing part, 140 Flat electromagnetic steel sheet, 141, 142, 210, 220 holes, 150 piping 151-164,171-184,621-634,641-654 region, 190 solid powder, 200,200A melting part, 230 peripheral edge, 611,613,615 thick part, 612,614 thin part, 616,618,620 Flat part, 617, 619 Twisted part, 661-674 Permanent magnet set, 680-694 Through hole, 711, 713, 715 Easy axis maintaining part, 712, 714 Easy axis changing part, 721, 723, 725 Pure part, 722,724 Impurity containing part.

Claims (22)

An electric motor comprising a stator and a rotor,
The rotor is
A rotor core composed of a plurality of ferromagnetic members stacked in the direction of the rotation axis of the rotor;
A plurality of magnets provided in the circumferential direction of the rotor and each inserted into the rotor core from the rotation axis direction of the rotor;
The rotor core is
A plurality of magnet insertion holes provided in the circumferential direction of the rotor and for inserting the plurality of magnets;
A plurality of first members each provided in contact with one end of the magnet insertion hole on the outer peripheral side of the magnet insertion hole and holding the magnet against the centrifugal force of the magnet based on the rotation of the rotor A magnet holding part,
A plurality of second members each provided in contact with the other end of the magnet insertion hole on the outer peripheral side of the magnet insertion hole and holding the magnet against the centrifugal force of the magnet based on the rotation of the rotor. And a magnet holding part
Each of the plurality of first and second magnet holding portions has a magnetic permeability smaller than the magnetic permeability of the ferromagnetic member in the circumferential direction of the rotor.   2. The electric motor according to claim 1, wherein each of the plurality of first and second magnet holding portions is subjected to a process of reducing magnetic permeability in a circumferential direction of the rotor. Each of the plurality of ferromagnetic members is
A plurality of through holes for penetrating the ferromagnetic member in the rotation axis direction of the rotor and forming the plurality of magnet insertion holes;
A plurality of first portions each provided in contact with one end of the through hole on the outer peripheral side of the through hole in the radial direction of the rotor and having a thickness in the rotation axis direction of the rotor smaller than that of the other portion. And the thin part of
Each of the plurality of second electrodes is provided on the outer peripheral side of the through hole in the radial direction of the rotor and in contact with the other end of the through hole, and the thickness of the rotor in the rotation axis direction is thinner than that of the other part. 2 thin-walled parts,
Each of the plurality of first magnet holding portions is formed of the plurality of ferromagnetic members, and includes a plurality of first thin portions disposed substantially linearly in the rotation axis direction of the rotor,
Each of the plurality of second magnet holding portions is formed of the plurality of ferromagnetic members, and includes a plurality of second thin portions arranged substantially linearly in the rotation axis direction of the rotor,
Each of the plurality of magnet insertion holes is formed of the plurality of ferromagnetic members, and includes a plurality of through holes arranged substantially linearly in the rotation axis direction of the rotor. Electric motor. Each of the plurality of ferromagnetic members is
A plurality of through holes for penetrating the ferromagnetic member in the rotation axis direction of the rotor and forming the plurality of magnet insertion holes;
A plurality of each of which is provided in contact with one end of the through hole on the outer peripheral side of the through hole in the radial direction of the rotor and is twisted at least one turn around a straight line connecting both ends of the through hole. A first twisted portion;
Each of which is provided in contact with the other end of the through hole on the outer peripheral side of the through hole in the radial direction of the rotor and is twisted at least one turn around a straight line connecting both end portions of the through hole. A second twisted portion,
Each of the plurality of first magnet holding portions is formed of the plurality of ferromagnetic members, and includes a plurality of first torsion portions arranged substantially linearly in the rotation axis direction of the rotor,
Each of the plurality of second magnet holding portions is formed of the plurality of ferromagnetic members, and includes a plurality of second twisted portions arranged substantially linearly in the rotation axis direction of the rotor,
Each of the plurality of magnet insertion holes is formed of the plurality of ferromagnetic members, and includes a plurality of through holes arranged substantially linearly in the rotation axis direction of the rotor. Electric motor. Each of the plurality of ferromagnetic members is
A plurality of through holes for penetrating the ferromagnetic member in the rotation axis direction of the rotor and forming the plurality of magnet insertion holes;
A plurality of first magnets each provided in contact with one end of the through hole on the outer peripheral side of the through hole in the radial direction of the rotor and having an easy magnetization axis in a direction substantially orthogonal to the circumferential direction of the rotor The easy axis change part of
A plurality of second magnets, each provided in contact with the other end of the through hole on the outer peripheral side of the through hole in the radial direction of the rotor, and having an easy magnetization axis in a direction substantially orthogonal to the circumferential direction of the rotor. And an easy axis change part of
Each of the plurality of first magnet holding portions includes a plurality of first easy-magnetization axis changing portions formed on the plurality of ferromagnetic members and arranged substantially linearly in the rotation axis direction of the rotor,
Each of the plurality of second magnet holding portions includes a plurality of second easy-magnetization axis changing portions formed on the plurality of ferromagnetic members and arranged substantially linearly in the rotation axis direction of the rotor,
Each of the plurality of magnet insertion holes is formed of the plurality of ferromagnetic members, and includes a plurality of through holes arranged substantially linearly in the rotation axis direction of the rotor. Electric motor.   6. The electric motor according to claim 5, wherein each of the plurality of first and second easy magnetization axis changing units has an easy magnetization axis close to a radial direction of the rotor or a rotation axis direction of the rotor. Each of the plurality of ferromagnetic members is
A plurality of through holes for penetrating the ferromagnetic member in the rotation axis direction of the rotor and forming the plurality of magnet insertion holes;
A plurality of first impurity-containing portions each provided in contact with one end of the through-hole on the outer peripheral side of the through-hole in the radial direction of the rotor and including an impurity that lowers magnetic permeability;
Each having a plurality of second impurity-containing portions provided in contact with the other end of the through-hole on the outer peripheral side of the through-hole in the radial direction of the rotor and including an impurity that reduces magnetic permeability ,
Each of the plurality of first magnet holding portions is formed of the plurality of ferromagnetic members, and includes a plurality of first impurity-containing portions arranged substantially linearly in the rotation axis direction of the rotor,
Each of the plurality of second magnet holding portions includes a plurality of second impurity-containing portions formed on the plurality of ferromagnetic members and arranged substantially linearly in the rotation axis direction of the rotor,
Each of the plurality of magnet insertion holes is formed of the plurality of ferromagnetic members, and includes a plurality of through holes arranged substantially linearly in the rotation axis direction of the rotor. Electric motor.   The electric motor according to claim 7, wherein each of the plurality of first and second impurity-containing portions includes carbon or nitrogen.   9. The electric motor according to claim 4, wherein each of the plurality of ferromagnetic members has a substantially uniform thickness in an in-plane direction substantially perpendicular to a rotation axis of the rotor. Each of the plurality of magnets includes first and second magnets arranged in a substantially V shape such that a V-shaped opening portion faces the outer circumferential direction of the rotor,
The plurality of first magnet holding portions hold the plurality of first magnets arranged in the circumferential direction of the rotor against the centrifugal force,
The plurality of second magnet holding portions according to any one of claims 1 to 9, wherein the plurality of second magnet holding portions hold a plurality of second magnets arranged in a circumferential direction of the rotor against the centrifugal force. The electric motor described. A method of manufacturing an electric motor including a stator and a rotor,
The rotor is
A rotor core composed of a plurality of ferromagnetic members stacked in the direction of the rotation axis of the rotor;
A plurality of magnets provided in the circumferential direction of the rotor and each inserted into the rotor core from the rotation axis direction of the rotor;
The rotor core is
A plurality of magnet insertion holes arranged in the circumferential direction of the rotor and for inserting the plurality of magnets;
A plurality of first members each provided in contact with one end of the magnet insertion hole on the outer peripheral side of the magnet insertion hole and holding the magnet against the centrifugal force of the magnet based on the rotation of the rotor A magnet holding part,
A plurality of second members each provided in contact with the other end of the magnet insertion hole on the outer peripheral side of the magnet insertion hole and holding the magnet against the centrifugal force of the magnet based on the rotation of the rotor. And a magnet holding part
The method for manufacturing the electric motor includes:
Permeability in the circumferential direction of the plurality of first and second regions with respect to the plurality of first and second regions of the ferromagnetic member in which the plurality of first and second magnet holding portions are formed. A first step of performing a process of making the magnetic field smaller than the permeability of other regions;
Both end portions are in contact with the first and second regions, respectively, and a plurality of through holes each penetrating the ferromagnetic member are positioned at inner peripheral sides of the plurality of first and second regions. A second step to produce;
A third step of repeating the first and second steps for the plurality of ferromagnetic members;
A fourth step of laminating the plurality of ferromagnetic members so that the plurality of magnet insertion holes are formed by the plurality of through holes after the third step;
And a fifth step of inserting the plurality of magnets into the plurality of magnet insertion holes after the fourth step. The first step is a step of pressing the plurality of first and second regions to make the plurality of first and second regions thinner than the other regions,
The method of manufacturing an electric motor according to claim 11, wherein the second step is executed after the first step.   The first step is a step that is performed after the second step, and that each of the plurality of third regions surrounded by the first and second regions and the through hole is twisted at least once. The manufacturing method of the electric motor of Claim 11.   The first step is performed after the second step, and is a step of bringing the easy axis directions of the plurality of first and second regions closer to a direction substantially perpendicular to the circumferential direction of the rotor. Item 12. A method for manufacturing an electric motor according to Item 11.   The method for manufacturing an electric motor according to claim 14, wherein the first step is a step of bringing the easy axis directions of the plurality of first and second regions closer to the radial direction of the rotor.   The method of manufacturing an electric motor according to claim 14, wherein the first step is a step of bringing the easy axis directions of the plurality of first and second regions closer to the rotation axis direction of the rotor.   The motor manufacturing method according to any one of claims 14 to 16, wherein the first step is a step of processing the plurality of first and second regions at a predetermined temperature and a predetermined pressure. Method. A method of manufacturing an electric motor including a stator and a rotor,
The rotor is
A rotor core composed of a plurality of ferromagnetic members stacked in the direction of the rotation axis of the rotor;
A plurality of magnets provided in the circumferential direction of the rotor and each inserted into the rotor core from the rotation axis direction of the rotor;
The rotor core is
A plurality of magnet insertion holes arranged in the circumferential direction of the rotor and for inserting the plurality of magnets;
A plurality of first members each provided in contact with one end of the magnet insertion hole on the outer peripheral side of the magnet insertion hole and holding the magnet against the centrifugal force of the magnet based on the rotation of the rotor A magnet holding part,
A plurality of second members each provided in contact with the other end of the magnet insertion hole on the outer peripheral side of the magnet insertion hole and holding the magnet against the centrifugal force of the magnet based on the rotation of the rotor. And a magnet holding part
The method for manufacturing the electric motor includes:
A first step of cutting out the plurality of ferromagnetic members from a flat ferromagnetic member;
In each of the plurality of cut-out ferromagnetic members, both ends of the plurality of first and second magnet holding portions are formed at positions on the inner peripheral side of the plurality of first and second regions. A second step of forming a plurality of through holes each of which is in contact with the first and second regions, and each of which penetrates the ferromagnetic member;
A third step of laminating the plurality of ferromagnetic members so that the plurality of magnet insertion holes are formed by the plurality of through holes after the second step;
In each of the plurality of laminated ferromagnetic members, a magnetic permeability lowering process for lowering the magnetic permeability of the plurality of first and second regions to be lower than the magnetic permeability of other regions due to impurities. A fourth step applied to the second region;
And a fifth step of inserting the plurality of magnets into the plurality of magnet insertion holes after the fourth step. A method of manufacturing an electric motor including a stator and a rotor,
The rotor is
A rotor core composed of a plurality of ferromagnetic members stacked in the direction of the rotation axis of the rotor;
A plurality of magnets provided in the circumferential direction of the rotor and each inserted into the rotor core from the rotation axis direction of the rotor;
The rotor core is
A plurality of magnet insertion holes arranged in the circumferential direction of the rotor and for inserting the plurality of magnets;
A plurality of first members each provided in contact with one end of the magnet insertion hole on the outer peripheral side of the magnet insertion hole and holding the magnet against the centrifugal force of the magnet based on the rotation of the rotor A magnet holding part,
A plurality of second members each provided in contact with the other end of the magnet insertion hole on the outer peripheral side of the magnet insertion hole and holding the magnet against the centrifugal force of the magnet based on the rotation of the rotor. And a magnet holding part
The method for manufacturing the electric motor includes:
A plurality of first and second regions in which the plurality of first and second magnet holding portions are formed in each of a plurality of regions for cutting out the plurality of ferromagnetic members of the flat ferromagnetic member. A first step of performing a magnetic permeability lowering process for lowering the magnetic permeability of the plurality of first and second regions to be lower than the magnetic permeability of other regions due to impurities;
A second step of cutting the plurality of ferromagnetic members from the treated flat ferromagnetic member;
In each of the plurality of cut-out ferromagnetic members, both end portions are in contact with the first and second regions, respectively, and a plurality of through holes each penetrating the ferromagnetic member are provided in the plurality of the plurality of ferromagnetic members. A third step of creating the first and second regions at positions on the inner periphery side;
A fourth step of laminating the plurality of ferromagnetic members so that the plurality of magnet insertion holes are formed by the plurality of through holes after the third step;
And a fifth step of inserting the plurality of magnets into the plurality of magnet insertion holes after the fourth step.   The magnetic permeability lowering process is a process of heating the plurality of first and second regions to a predetermined temperature while spraying a gas containing the impurities onto the plurality of first and second regions. Or the manufacturing method of the electric motor of Claim 19.   The magnetic permeability lowering step is a step of placing the solid containing the impurities on the plurality of first and second regions and heating the plurality of first and second regions to a predetermined temperature to melt the solid. The method for manufacturing an electric motor according to claim 18 or 19, wherein:   The method for manufacturing an electric motor according to claim 20, wherein the impurity is nitrogen or carbon.

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