WO2010110150A1 - Moteur a aimants permanents incorpores - Google Patents

Moteur a aimants permanents incorpores Download PDF

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Publication number
WO2010110150A1
WO2010110150A1 PCT/JP2010/054583 JP2010054583W WO2010110150A1 WO 2010110150 A1 WO2010110150 A1 WO 2010110150A1 JP 2010054583 W JP2010054583 W JP 2010054583W WO 2010110150 A1 WO2010110150 A1 WO 2010110150A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnet
rotor
embedded
rotation axis
electric motor
Prior art date
Application number
PCT/JP2010/054583
Other languages
English (en)
Japanese (ja)
Inventor
浩忠 長野
Original Assignee
三相電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三相電機株式会社 filed Critical 三相電機株式会社
Publication of WO2010110150A1 publication Critical patent/WO2010110150A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect

Definitions

  • the present invention relates to a rotor in a permanent magnet embedded type electric motor including a stator and a rotor that rotates in the stator, in particular, a permanent magnet embedded having a rotor in which a permanent magnet is embedded in a rotor core constituting the rotor.
  • the present invention relates to a built-in electric motor.
  • a rotor of a conventional embedded permanent magnet electric motor has a plurality of magnet accommodation holes for accommodating permanent magnets in the direction of the rotation axis of a rotor core constituting the rotor, and each of the magnet accommodation holes has a permanent magnet.
  • As the shape of the permanent magnet housing hole various shapes considered for improving efficiency and suppressing vibration and noise are considered.
  • the shape of these permanent magnet accommodation holes is a circular arc shape in which the permanent magnet accommodation holes are convex on the rotation axis side and both ends are extended to the outer periphery on a plane perpendicular to the rotation axis of the rotor.
  • the width between the two permanent magnet housing holes toward the inner peripheral side in the radial direction of the rotor on a surface perpendicular to the rotation axis of the rotor (for example, see Patent Document 1) On the surface that is narrow and convex toward the rotating shaft and has a substantially V-shape (see, for example, Patent Document 2), or in a plane perpendicular to the rotating shaft of the rotor, A substantially V-shaped permanent magnet housing hole which is convex toward the outer peripheral side, and between this substantially V-shaped permanent magnet housing hole and another substantially V-shaped permanent magnet housing hole adjacent in the circumferential direction.
  • one having a shape in which one permanent magnet housing hole in the radial direction is additionally provided (see, for example, Patent Document 3). Etc. there is.
  • the amount of the permanent magnet that works effectively is increased in order to increase the torque and improve the efficiency while maintaining the mechanical strength of the rotor. Yes.
  • the rotor of the permanent magnet embedded motor as described above does not have P permanent magnets with respect to the number P of magnetic poles. Basically, if there are P permanent magnets, a P-pole magnetic pole can be formed. Therefore, compared with a shape in which a plurality of permanent magnets are arranged in the circumferential direction of the rotor, these embedded permanent magnet electric motors The number of permanent magnets used in the rotor will increase.
  • the cost of the permanent magnet includes not only the material cost but also the molding cost and processing cost required when forming the individual permanent magnets. In particular, a material with a low permanent magnet material cost is used. In this case, the ratio of the above cost increase becomes large. For this reason, even if the material used is a permanent magnet having the same volume, the cost increases as the number of permanent magnets increases.
  • the present invention has been made in view of the above circumstances, and the problem to be solved by the present invention is to improve performance while making the number of permanent magnets of a rotor of an embedded permanent magnet motor the same as the number of magnetic poles.
  • An object of the present invention is to provide a permanent magnet embedded type electric motor having a rotor.
  • a rotor core having a plurality of permanent magnet housing holes in the direction of the rotation axis of the rotor, and a surface perpendicular to the rotation axis of the rotor.
  • the permanent magnet housing hole in FIG. 1 has a rotor in which a permanent magnet is inserted in which the longitudinal surfaces of permanent magnets adjacent in the circumferential direction are inserted with the same polarity. Further, the number of the plurality of permanent magnet housing holes is the same as the number of the plurality of magnetic poles of the rotor.
  • the longitudinal surfaces of all the permanent magnet accommodation holes in the plane perpendicular to the rotation axis of the rotor are in a direction extending from the rotor inner circumference side to the rotor outer circumference side and in a range not interfering with the adjacent permanent magnet accommodation holes.
  • the rotor outer peripheral side of the permanent magnet housing hole is inclined in the same circumferential direction with respect to the radial direction of the rotor, and the rotor has a rotor in which the permanent magnet is embedded in the permanent magnet housing hole. This is a permanent magnet embedded electric motor.
  • the permanent magnet accommodation hole has a flat plate shape in a plane perpendicular to the rotation axis of the rotor.
  • the flat plate-shaped permanent magnet receiving hole in which the flat plate-shaped permanent magnets are arranged on the plane perpendicular to the rotation axis of the rotor is long from the longitudinal end surface of the permanent magnet to at least one side of the longitudinal end surface.
  • the air gap extending in the longitudinal direction from the flat-plate-shaped permanent magnet accommodation hole on the plane perpendicular to the rotation axis of the rotor extends from at least one of the ends to the longitudinal surface side of the permanent magnet accommodation hole. 4.
  • a part of the outer periphery of the rotor facing the teeth at the tip of the slot of the stator on the plane perpendicular to the rotation axis is the end of the permanent magnet housing hole on the outer periphery side of the rotor. 5.
  • the longitudinal surfaces of the permanent magnets adjacent to each other in the circumferential direction of the rotor are made of the same poles in the plane perpendicular to the rotation axis of the rotor.
  • the number of permanent magnet housing holes for embedding a plurality of permanent magnets is the same as the number of magnetic poles of the rotor.
  • the motor can be reduced in size as compared with a conventional motor having a surface magnet type (SPM) rotor.
  • SPM surface magnet type
  • the permanent magnet accommodation hole is formed in a flat plate shape on a surface perpendicular to the rotation axis direction of the rotor, and the shape of the permanent magnet disposed in the permanent magnet accommodation hole is a flat plate.
  • the permanent magnet is eliminated from the longitudinal end surface of the permanent magnet accommodation hole in which the permanent magnet is disposed, and this portion is formed as a gap extending in the longitudinal direction, thereby forming an end surface portion of the permanent magnet accommodation hole. Since a region having a low magnetic permeability is formed, short-circuiting of magnetic flux can be limited, and the amount of permanent magnets in the portions where the permanent magnets at the end portions of the permanent magnets are not working effectively can be reduced.
  • the short-circuit of the permanent magnet's magnetic flux is the longitudinal end of the permanent magnet.
  • the degree of short-circuiting of the magnetic flux was increased.
  • the slit extending from the outer peripheral side gap extending from the longitudinal direction of the permanent magnet housing hole to the outer peripheral direction of the rotor is provided on the surface perpendicular to the rotation axis of the rotor, the cogging torque increased with the torque. Torque ripple can be suppressed, and noise and vibration of the permanent magnet embedded motor can be efficiently suppressed by the slit length of the outer peripheral slit. Furthermore, since it has an inner peripheral side slit that extends in the outer peripheral direction of the rotor from one end of the inner peripheral side gap that extends in the inner peripheral direction of the rotor, a short circuit of magnetic flux in the inner peripheral portion of the rotor of the permanent magnet is further reduced.
  • the increase in torque and the improvement in efficiency can be achieved by the slit length of the inner peripheral slit.
  • the slit length of the inner slit is increased, the strength of the rotor core also decreases, so the torque length and efficiency can be improved efficiently by optimizing the slit length of the inner slit. Is possible.
  • the means of claim 5 in order to drive the rotor, it is used by being incorporated in a stator facing the rotor with a gap in a plane perpendicular to the rotor, but a part of the outer periphery of the rotor Is formed in a flat shape, the width of the gap between the rotor and the stator in this part is increased, the magnetic resistance is increased, and the teeth portion of the stator slot that opposes the rotor and the gap.
  • produces via can be suppressed.
  • FIG. 1 is a view showing a plane perpendicular to the rotation axis of an embedded permanent magnet rotor according to an embodiment of the present invention.
  • the stator 1 In a plane perpendicular to the rotation axis 9 of the rotor 6, the stator 1 is opposed to the rotor 6 through a gap 12 in the center direction from a substantially annular ring portion 2 that forms the outer diameter of the stator core 1 a.
  • the extending 12 radial teeth 3 are formed in an annular shape.
  • a slot 4 that is a space for winding a copper wire on both sides of each tooth 3 and an insulator (not shown) for securing insulation between the iron core of the stator 1 and the winding wire 5 when forming the winding wire 5 are provided.
  • the wire 5 in which a copper wire is wound is provided in the space of the slot 4. This winding 5 is made by Y-connection, and the U-phase, V-phase, and W-phase windings are connected in series and connected at a neutral point.
  • the rotor 6 includes a rotor core 7, a rotating shaft 9 that fixes the rotor core 7, a permanent magnet 10 that is inserted into a permanent magnet accommodation hole 8 that exists inside the rotor core 7, and the rotor core 7.
  • the fixed plates are fixed by rivets that penetrate the rotor 6 in the direction of the rotary shaft 9. Formed from different shapes.
  • the rotor core 7 is formed by laminating electromagnetic steel plates in the direction of the rotation shaft 9, and the rotation shaft 9 is inserted into and fixed to a rotation shaft insertion hole (not shown) formed in the center portion. 9 is supported inside the stator 1 in a rotatable state. Further, on the rotor core 7, the longitudinal surfaces of all the permanent magnet housing holes 8 are adjacent to each other in a direction extending from the inner peripheral side to the outer peripheral side of the rotor 6 on a plane perpendicular to the rotary shaft 9.
  • Eight receiving holes 8 corresponding to the number of magnetic poles are formed at equal intervals in the circumferential direction.
  • the rotor core 7 are provided with rivet holes 7a through which rivets for fixing fixing plates (not shown) provided at both ends of the rotor core 7 in the direction of the rotating shaft 9 are passed.
  • the permanent magnet 10 is magnetized perpendicularly to the longitudinal surface in the radial direction on a surface perpendicular to the rotation axis 9 of the rotor 6, and the longitudinal surfaces of the adjacent permanent magnet accommodation holes 8 are N poles or S poles. It is inserted so as to be the same polarity.
  • the flat permanent magnet 10 shown in FIG. 6A that can be manufactured at the lowest cost is used.
  • the permanent magnet amount can be further increased by making the shape of the permanent magnet 10 not the flat plate shape but the arc plate shape shown in FIG.
  • a high torque embedded permanent magnet electric motor can be realized. In these FIG.
  • the inner peripheral side gap 8c on the rotor inner peripheral side 8b at the end of the permanent magnet, the outer peripheral side gap 8d on the rotor outer peripheral side 8a, the inner peripheral side slit 8f, the outer peripheral side slit 8h, and the outer peripheral side 8i is abbreviate
  • the rotor core 7 has a large degree of short-circuiting of magnetic flux at the longitudinal end portions of the permanent magnets 10 of the permanent magnet receiving holes 8 on the surface perpendicular to the rotation axis 9 of the rotor 6. Therefore, in order to limit the short circuit of the magnetic flux, as the gap extending from both end portions of the permanent magnet 10 in the longitudinal direction, the inner circumference side gap 8c on the inner circumference side of the rotor 6 and the outer circumference side gap on the rotor outer circumference side 8a. 8d is provided.
  • the inner circumferential side gap 8c is extended in a range not contacting the adjacent permanent magnet accommodation hole 8.
  • the width of the inner peripheral side bridge iron core 8e sandwiched between the adjacent permanent magnet accommodation holes 8 becomes narrower and the strength of the rotor core 7 decreases. Therefore, the rotor core 7 is formed by leaving the width of the sandwiched inner peripheral bridge core 8e so that the strength does not decrease.
  • the inner circumferential side slit 8f is formed in the rotor outer circumferential side 8a extending from a part of the inner circumferential side gap 8c, and the efficiency is improved by changing the slit length Lc of the inner circumferential side slit 8f. Can be improved.
  • the slit length Lc of the inner peripheral side slit 8f becomes longer, the strength of the rotor core 7 decreases, and the improvement in efficiency is saturated as shown in FIG. For this reason, the slit length Lc of the inner peripheral side slit 8f is formed to a length that becomes a saturation point of efficiency.
  • the outer peripheral side gap 8 d of the permanent magnet housing hole 8 extends to the vicinity of the outer periphery of the rotor 6 within a range not contacting the outer periphery of the rotor 6.
  • the strength of the rotor core 7 decreases as the width of the outer peripheral bridge core 8g at the outer peripheral portion of the rotor 6 decreases. Therefore, the rotor core 7 is formed while leaving the width of the outer peripheral bridge core 8g at the outer peripheral portion of the rotor 6 as thin as the strength does not drop.
  • an outer peripheral side slit 8h and an outer peripheral side slit 8i extending from the outer peripheral side gap 8d to both sides in the circumferential direction of the rotor 6 are formed.
  • the slit length La of the outer slit 8h and the slit length Lb of the outer slit 8i are optimized.
  • the flat shape portion 11 provided on the rotor outer peripheral side 8 a on the surface perpendicular to the rotation shaft 9 is formed by the center of the end surface of the outer peripheral portion of the rotor 6 of the permanent magnet 10 and the rotor.
  • the tangent line translated and the outer periphery and intersection of the rotor 6 are formed in the rounded portion 13 without corners in order to increase the durability of the mold shape during mass production. .
  • the permanent magnet 10 shown in FIG. 1 is not divided with respect to the direction of the rotating shaft 9, and the number of magnetic poles of the rotor 6 and the number of permanent magnets 10 completely coincide with each other. It has become.
  • the size of the permanent magnet 10 in the direction of the rotary shaft 9 is also large, so that the production yield of the permanent magnet 10 may be deteriorated. Therefore, when the production yield of the permanent magnet 10 is deteriorated as described above, there is no problem even if the permanent magnet 10 is divided in the direction of the rotating shaft 9.
  • FIG. 7 is a shaft output showing the efficiency characteristics at a rotational speed of 1200 rpm, respectively, of an electric motor composed of an embedded permanent magnet (IPM) rotor of the present invention and an electric motor composed of a conventional surface magnet type (SPM) rotor. It is a graph which shows the relationship between efficiency.
  • the outer diameter of the stator (stator) is ⁇ 122 mm
  • the stator thickness is 65 mm
  • the length of the permanent magnet is 75 mm
  • the volume of the permanent magnet is 10705 mm 3 .
  • the outer diameter of the stator is 112 mm
  • the stator thickness is 55 mm
  • the length of the permanent magnet The thickness is 60 mm
  • the volume of the permanent magnet is 8006 mm 3 . That is, in the permanent magnet embedded type electric motor of the present invention, when the performance is substantially the same as that of the conventional surface magnet type electric motor, the size of the embedded permanent magnet electric motor of the present invention is the same as that of the conventional surface magnet.
  • the outer diameter of the stator can be reduced to 6.6%, the stator thickness can be reduced to 15.4%, the length of the permanent magnet can be 20%, and the volume of the permanent magnet can be reduced to 25%.
  • the permanent magnet embedded type electric motor of the invention is small in size and high in performance.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

La présente invention concerne un moteur à aimants permanents incorporés comportant : un noyau de rotor (7) comprenant des orifices contenant des aimants permanents (8) formés le long d'un arbre rotatif (9) ; et un rotor (6) équipé d'aimants permanents (10) introduits dans les orifices contenant des aimants permanents (8) de sorte que, dans un plan perpendiculaire à l'arbre rotatif (9), les surfaces d'extrémité longitudinales des aimants permanents (10) situés adjacents les uns aux autres dans la direction circonférentielle du rotor (6) ont la même polarité. Il est prévu un nombre égal de pôles magnétiques et d'orifices contenant des aimants permanents (8), et dans un plan perpendiculaire à l'arbre rotatif (9), les surfaces longitudinales de tous les orifices contenant des aimants permanents (8) se prolongent depuis la face périphérique intérieure jusqu'à la face périphérique extérieure du rotor (6) de sorte que les orifices contenant des aimants permanents adjacents (8) n'interfèrent pas les uns avec les autres et que ces parties des orifices contenant des aimants permanents qui sont sur la face périphérique extérieure (8a) du rotor sont inclinés dans la même direction circonférentielle par rapport à la direction radiale. Ainsi, les orifices contenant des aimants permanents (8) présentent une forme qui peut accroître la quantité d'aimants permanents. Les aimants permanents (10) sont disposés dans les orifices contenant des aimants permanents (8).
PCT/JP2010/054583 2009-03-25 2010-03-17 Moteur a aimants permanents incorpores WO2010110150A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009075201A JP2012114970A (ja) 2009-03-25 2009-03-25 永久磁石埋込型電動機
JP2009-075201 2009-03-25

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WO2010110150A1 true WO2010110150A1 (fr) 2010-09-30

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103208872A (zh) * 2012-01-16 2013-07-17 三星电子株式会社 转子和包括该转子的发动机
CN111919360A (zh) * 2018-03-23 2020-11-10 爱信艾达株式会社 旋转电机用转子

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101573690B1 (ko) 2013-09-26 2015-12-03 주식회사 효성 매입형 영구자석 전동기의 회전자
JP2016123236A (ja) * 2014-12-25 2016-07-07 株式会社富士通ゼネラル 永久磁石電動機
KR102407352B1 (ko) * 2016-12-15 2022-06-13 한국전자기술연구원 스큐가 적용된 회전자 철심을 갖는 회전자 및 그를 포함하는 자속집중형 전동기
KR102058872B1 (ko) * 2019-06-17 2019-12-26 (주) 코모텍 스포크형 모터의 회전자

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06245419A (ja) * 1993-02-10 1994-09-02 Honda Motor Co Ltd 電動機又は発電機のヨーク
JPH0974729A (ja) * 1995-09-06 1997-03-18 Seiko Epson Corp ブラシレスモータの回転子
JP2001211582A (ja) * 2000-01-26 2001-08-03 Fujitsu General Ltd 永久磁石電動機
JP2002519976A (ja) * 1998-06-25 2002-07-02 バレオ、エキプマン、エレクトリック、モートゥール モータ乗物のための交流発電機のような回転機械

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06245419A (ja) * 1993-02-10 1994-09-02 Honda Motor Co Ltd 電動機又は発電機のヨーク
JPH0974729A (ja) * 1995-09-06 1997-03-18 Seiko Epson Corp ブラシレスモータの回転子
JP2002519976A (ja) * 1998-06-25 2002-07-02 バレオ、エキプマン、エレクトリック、モートゥール モータ乗物のための交流発電機のような回転機械
JP2001211582A (ja) * 2000-01-26 2001-08-03 Fujitsu General Ltd 永久磁石電動機

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103208872A (zh) * 2012-01-16 2013-07-17 三星电子株式会社 转子和包括该转子的发动机
EP2615724A3 (fr) * 2012-01-16 2015-04-15 Samsung Electronics Co., Ltd. Rotor et moteur comprenant ce dernier
US9831729B2 (en) 2012-01-16 2017-11-28 Samsung Electronics Co., Ltd. Electric motor's sectional rotor with asymmetric poles having permanent magnets
CN111919360A (zh) * 2018-03-23 2020-11-10 爱信艾达株式会社 旋转电机用转子
CN111919360B (zh) * 2018-03-23 2023-09-12 株式会社爱信 旋转电机用转子

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