WO2016161685A1 - 一种永磁转子 - Google Patents

一种永磁转子 Download PDF

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Publication number
WO2016161685A1
WO2016161685A1 PCT/CN2015/078364 CN2015078364W WO2016161685A1 WO 2016161685 A1 WO2016161685 A1 WO 2016161685A1 CN 2015078364 W CN2015078364 W CN 2015078364W WO 2016161685 A1 WO2016161685 A1 WO 2016161685A1
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WO
WIPO (PCT)
Prior art keywords
permanent magnet
rotor
permanent
permanent magnets
punch
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Application number
PCT/CN2015/078364
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English (en)
French (fr)
Inventor
王科威
温瑞光
Original Assignee
睿能机电有限公司
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
Priority claimed from CN201510167153.XA external-priority patent/CN106160284A/zh
Priority claimed from CN201520212977.XU external-priority patent/CN204481590U/zh
Application filed by 睿能机电有限公司 filed Critical 睿能机电有限公司
Priority to US14/787,265 priority Critical patent/US20170117764A1/en
Publication of WO2016161685A1 publication Critical patent/WO2016161685A1/zh

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    • 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
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • 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]
    • 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
    • H02K1/2786—Outer rotors
    • H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2789—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/279—Magnets embedded in the magnetic core
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the invention relates to a rotor of an electric machine, in particular a permanent magnet rotor embedded in a permanent magnet.
  • the curved magnetic steel is fixed on the surface of the rotor by bonding, or a dovetail groove is formed at the outer circumference of the rotor, and the curved magnetic steel is fixed in the dovetail groove, but the above two installations In the method, the permanent magnets are easy to fall off or the rotor core is pulled out, and the production cost of the curved magnetic steel is high. Therefore, the above two installation methods have the problems of low reliability and high cost.
  • the prior art mostly adopts a permanent magnet in-body embedding method to solve the problem of reliably fixing the permanent magnets, such as the Chinese utility model patent “A permanent magnet motor with application number 201020507457.9”.
  • Rotor Chinese utility model patent No. 201020590805.3 "Permanent magnet rotor with built-in magnetic steel uneven air gap structure” and the like disclose a rotor structure with embedded permanent magnets, although the rotor structure of the above patent can be solved.
  • the present invention provides a magnetic circuit structure of a novel embedded permanent magnet rotor, which can improve the magnetic short circuit phenomenon at both ends of each magnetic pole, and make the permanent magnet
  • the utilization rate is increased and the space utilization of the rotor is also increased, thereby increasing the power density of the motor.
  • the present invention provides a permanent magnet rotor comprising:
  • a rotor core formed by laminating a plurality of rotor punches, wherein a center of the rotor punch has a shaft hole, and a plurality of permanent magnet slots are arranged on the rotor punch, and both ends of the permanent magnet slot There is an air gap slot, the permanent magnet slots are evenly distributed in the circumferential direction of the rotor punching piece, and a connecting bridge is arranged between two adjacent permanent magnet slots;
  • the shaft hole is a circular hole.
  • the shape of the rotor punch is composed of a plurality of arcs
  • the shape of the permanent magnet slot is composed of a plurality of arcs
  • the shape of the above connecting bridge is "T” type, or "Y” type.
  • the cross-sectional shape of the permanent magnet is square, trapezoidal or curved.
  • the permanent magnets are disposed at the center of the permanent magnet slots, and the number of the permanent magnets is 6 pieces, 3 pairs, 1 pair, 2 pairs, 4 pairs or 5 pairs, and the adjacent permanent magnet poles are arranged oppositely.
  • the rotor punch is integrally formed.
  • a reinforcing rib is arranged between two adjacent permanent magnets.
  • the invention firstly improves the magnetic short circuit phenomenon at each end of the magnetic pole by providing an air gap groove at both ends of the permanent magnet, thereby improving the utilization ratio of the permanent magnet, and then forming a T-shaped connecting bridge between two adjacent permanent magnets to make the phase
  • the magnetic circuit between the adjacent two permanent magnets has a local magnetic saturation phenomenon, which reduces the magnetic leakage between the adjacent two permanent magnets, and improves the utilization of the permanent magnets, and then through the sinking design of the T-shaped connecting bridge.
  • Each permanent magnet can be effectively positioned, and the surface magnetic field between two adjacent permanent magnets is not abrupt, and the magnetic flux leakage between two adjacent permanent magnets is effectively reduced by the above-mentioned local magnetic saturation.
  • Figure 1 is a cross-sectional structural view of a rotor.
  • Figure 2 is a structural view of a rotor punch.
  • FIG 3 is a partial enlarged view of the T-shaped connecting bridge A.
  • Figure 4 shows the Y-shaped connecting bridge.
  • the present invention is a permanent magnet rotor comprising:
  • a rotor core 1 is formed by laminating a plurality of rotor punches 7, wherein a center of the rotor punching plate 7 is opened with a shaft hole 6, and a plurality of permanent magnet slots 5 are arranged on the rotor punching plate 7.
  • the permanent magnet slot 5 has air gap slots 2 at both ends thereof, the permanent magnet slots 5 are evenly distributed in the circumferential direction of the rotor punching strip 7, and there is a connecting bridge A between two adjacent permanent magnet slots 5;
  • a shaft 4 passes through the shaft hole 6 and is fixed to the rotor core 1.
  • the shaft hole 6 is a circular hole.
  • the permanent magnet slots 5 are evenly distributed in the circumferential direction of the rotor punching sheet 7.
  • the outer shape of the rotor punching piece 7 is composed of a plurality of arcs
  • the outer shape of the permanent magnet slot 5 is composed of a plurality of arcs.
  • each circumferentially-shaped T-shaped connecting bridges A are uniformly distributed in the circumferential direction of the rotor punching piece 7, and the outer shape thereof is composed of a plurality of arcs, and the sinking depth H is the
  • the permanent magnet has a thickness of 10% to 60%, and the lateral width W1 and the longitudinal width W2 are 0.5 to 3 mm.
  • the connecting bridge A may also be Y-shaped.
  • the cross-sectional shape of the permanent magnet 3 is square, trapezoidal or curved.
  • the permanent magnet 3 is disposed at the center of the permanent magnet slot 5, and the number of the permanent magnets 3 is 6 pieces, 3 pairs, 1 pair, 2 pairs, 4 pairs or 5 pairs, and adjacent permanent magnets 3
  • the magnetic poles are arranged in opposite directions.
  • the rotor punching piece 7 is integrally formed.
  • a reinforcing rib is disposed between two adjacent permanent magnets 3.
  • the invention firstly improves the magnetic short circuit phenomenon at each end of the magnetic pole by providing an air gap groove at both ends of the permanent magnet, thereby improving the utilization ratio of the permanent magnet, and then forming a T-shaped connecting bridge between two adjacent permanent magnets to make the phase
  • the magnetic circuit between the adjacent two permanent magnets has a local magnetic saturation phenomenon, which reduces the magnetic leakage between the adjacent two permanent magnets, and improves the utilization of the permanent magnets, and then through the sinking design of the T-shaped connecting bridge.
  • Each permanent magnet can be effectively positioned, and the surface magnetic field between two adjacent permanent magnets is not abrupt, and the magnetic flux leakage between two adjacent permanent magnets is effectively reduced by the above-mentioned local magnetic saturation.

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

Abstract

一种永磁转子，包括：一转子铁芯(1)，由多个转子冲片(7)叠压而成，其中，所述转子冲片(7)的中心开有一轴孔(6)，且所述转子冲片(7)上布置有多个永磁体槽(5)，永磁体槽(5)的两端有气隙槽(2)，永磁体槽(5)在所述转子冲片(7)的圆周方向上均匀分布，且相邻两个永磁体槽(5)间有一连接桥(A)；多个永磁体(3)，其中，所述多个永磁体(3)分别嵌入所述多个永磁体槽(5)内；及一转轴(4)，穿过所述轴孔(6)并固定于所述转子铁芯(1)。

Description

一种永磁转子 技术领域
本发明涉及一种电机转子，尤其是永磁体内嵌的永磁转子。
背景技术
根据传统的永磁体转子结构可知：弧形磁钢采用粘接方式固定在转子表面，或在转子的外圆处开设燕尾槽，并将弧形磁钢固定在燕尾槽内，但上述两种安装方式均存在永磁体容易脱落或甩出转子铁芯现象，而且弧形磁钢的生产成本较高，所以上述两种安装方式均存在可靠性不高，且成本较高的问题。为可靠地固定永磁体，并且降低永磁体的生产成本，现有技术大多采用永磁体内嵌方式以解决可靠固定永磁体的问题，如申请号为201020507457.9的中国实用新型专利《一种永磁电机转子》、申请号为201020590805.3的中国实用新型专利《采用內藏磁钢不均匀气隙结构的永磁转子》等文献中均公开了内嵌永磁体的转子结构，虽然上述专利的转子结构能解决可靠固定永磁体的问题，但永磁体内嵌后，会出现永磁体两端磁短路和转子空间利用率低的问题，即永磁体的利用率降低和电机的功率密度降低。
发明内容
为解决上述永磁体的利用率降低和电机的功率密度降低的问题，本发明提供了一种新型内嵌永磁体转子的磁路结构，能改善每个磁极两端的磁短路现象，使永磁体的利用率提高，而且转子的空间利用率也有所增加，从而提高电机的功率密度。
为达到以上目的，本发明提供一种永磁转子，其包括：
一转子铁芯，由多个转子冲片叠压而成，其中，所述转子冲片的中心开有一轴孔，且所述转子冲片上布置有多个永磁体槽，永磁体槽的两端有气隙槽，永磁体槽在所述转子冲片的圆周方向上均匀分布，且相邻两个永磁体槽间有一连接桥；
多个永磁体，其中，所述多个永磁体分别嵌入所述多个永磁体槽内；及
一转轴，穿过所述轴孔并固定于所述转子铁芯。
所述轴孔为圆形孔。
所述转子冲片的圆周方向上均匀分布有6个所述永磁体槽。
所述转子冲片的外形由多段弧线组成，永磁体槽的外形由多段弧线组成。
所述转子冲片的所述圆周方向上均匀分布有6个下沉式连接桥，其外形由多段弧线组成，其下沉深度为所述永磁体厚度的10％-60％，其横向宽度和纵向宽度取0.5-3mm。
上述连接桥的形状是“T”型，或“Y”型。
所述永磁体的截面形状是方形，梯形或弧形。
所述永磁体设于所述永磁体槽的中央，所述永磁体的数量为6片3对，1对，2对，4对或5对，且相邻永磁体磁极相反排列。
所述转子冲片为一体成型。
相邻两个永磁体间设有一个加强筋。
本发明首先通过在永磁体两端设置气隙槽来改善每个磁极两端的磁短路现象，进而提高永磁体的利用率，接着通过在相邻两个永磁体间设置T形连接桥，使相邻两个永磁体间的磁路出现局部磁饱和现象，进而减少相邻两个永磁体间的漏磁现象，并且提高了永磁体的利用率，然后通过T形连接桥的下沉设计，使每个永磁体都能得到有效的定位，并且使相邻两个永磁体间的表磁没有突变，同时通过上述设置局部磁饱和的方式，有效的减少相邻两个永磁体间的漏磁现象，最后因采用T形连接桥，所以相邻两个永磁体间只有一个加强筋，较现有技术的两个加强筋减少了一个，故能在同样的转子直径条件下，获得更大的永磁体，从而提高了转子的空间利用率，进而提供电机的功率密度。
本发明的这些目的，特点，和优点将会在下面的具体实施方式，附图，和权利要求中详细的揭露。
附图说明
图1为转子剖面结构图。
图2为转子冲片结构图。
图3为T形连接桥A的局部放大图。
图4为Y形连接桥。
具体实施方式
请参见图1和图2，本发明为一种永磁转子，其包括：
一转子铁芯1，由多个转子冲片7叠压而成，其中，所述转子冲片7的中心开有一轴孔6，且所述转子冲片7上布置有多个永磁体槽5，永磁体槽5的两端有气隙槽2，永磁体槽5在所述转子冲片7的圆周方向上均匀分布，且相邻两个永磁体槽5间有一连接桥A；
多个永磁体3，其中，所述多个永磁体3分别嵌入所述多个永磁体槽5内；及
一转轴4，穿过所述轴孔6并固定于所述转子铁芯1。
优选的，所述轴孔6为圆形孔。
优选的，所述转子冲片7的圆周方向上均匀分布有6个所述永磁体槽5。
优选的，所述转子冲片7的外形由多段弧线组成，永磁体槽5的外形由多段弧线组成。
请参见图3，优选的，所述转子冲片7的所述圆周方向上均匀分布有6个下沉式T形连接桥A，其外形由多段弧线组成，其下沉深度H为所述永磁体厚度的10％-60％，其横向宽度W1和纵向宽度W2取0.5-3mm。
请参见图4，优选的，所述连接桥A还可以是为Y形。
优选的，所述永磁体3的截面形状是方形，梯形或弧形。
优选的，所述永磁体3设于所述永磁体槽5的中央，所述永磁体3的数量为6片3对，1对，2对，4对或5对，且相邻永磁体3磁极相反排列。
优选的，所述转子冲片7为一体成型。
优选的，相邻两个永磁体3间设有一个加强筋。
本发明首先通过在永磁体两端设置气隙槽来改善每个磁极两端的磁短路现象，进而提高永磁体的利用率，接着通过在相邻两个永磁体间设置T形连接桥，使相邻两个永磁体间的磁路出现局部磁饱和现象，进而减少相邻两个永磁体间的漏磁现象，并且提高了永磁体的利用率，然后通过T形连接桥的下沉设计，使每个永磁体都能得到有效的定位，并且使相邻两个永磁体间的表磁没有突变，同时通过上述设置局部磁饱和的方式，有效的减少相邻两个永磁体间的漏磁现象，最后因采用T形连接桥，所以相邻两个永磁体间只有一个加强筋，较现有技术的两个加强筋减少了一个，故能在同样的转子直径条件下，获得更大的永磁体，从而提高了转子的空间利用率，进而提供电机的功率密度。
通过上述实施例，本发明的目的已经被完全有效的达到了。熟悉该项技艺的人士应该明白本发明包括但不限于附图和上面具体实施方式中描述的内容。任何不偏离本发明的功能和结构原理的修改都将包括在权利要求书的范围中。

Claims (10)

  1. 一种永磁转子，其包括：
    一转子铁芯，由多个转子冲片叠压而成，其中，所述转子冲片的中心开有一轴孔，且所述转子冲片上布置有多个永磁体槽，永磁体槽的两端有气隙槽，永磁体槽在所述转子冲片的圆周方向上均匀分布，且相邻两个永磁体槽间有一连接桥；
    多个永磁体，其中，所述多个永磁体分别嵌入所述多个永磁体槽内；及
    一转轴，穿过所述轴孔并固定于所述转子铁芯。
  2. 根据权利要求1所述的永磁转子，其中，所述轴孔为圆形孔。
  3. 根据权利要求1所述的永磁转子，其中，所述转子冲片的圆周方向上均匀分布有6个所述永磁体槽。
  4. 根据权利要求1所述的永磁转子，其中，所述转子冲片的外形由多段弧线组成，永磁体槽的外形由多段弧线组成。
  5. 根据权利要求1或2或3或4所述的永磁转子，其中，所述转子冲片的所述圆周方向上均匀分布有6个下沉式连接桥，其外形由多段弧线组成，其下沉深度为所述永磁体厚度的10％-60％，其横向宽度和纵向宽度取0.5-3mm。
  6. 根据权利要求5所述的永磁转子，其中，所述连接桥为T形或Y 形。
  7. 根据权利要求1所述的永磁转子，其中，所述永磁体的截面形状是方形，梯形或弧形。
  8. 根据权利要求1所述的永磁转子，其中，所述永磁体设于所述永磁体槽的中央，所述永磁体的数量为6片3对，1对，2对，4对或5对，且相邻永磁体磁极相反排列。
  9. 根据权利要求1所述的永磁转子，其中，所述转子冲片为一体成型。
  10. 根据权利要求1所述的永磁转子，其中，相邻两个永磁体间设有一个加强筋。
PCT/CN2015/078364 2015-04-10 2015-05-06 一种永磁转子 WO2016161685A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/787,265 US20170117764A1 (en) 2015-04-10 2015-05-06 Permanent magnet rotor

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201510167153.XA CN106160284A (zh) 2015-04-10 2015-04-10 一种永磁转子
CN201520212977.XU CN204481590U (zh) 2015-04-10 2015-04-10 一种永磁转子
CN201510167153.X 2015-04-10
CN201520212977.X 2015-04-10

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Publication number Priority date Publication date Assignee Title
CN107171525A (zh) * 2017-06-21 2017-09-15 江苏雅迪科技发展有限公司宁波分公司 永磁同步轮毂电机及电动车
PL232571B1 (pl) * 2018-04-11 2019-06-28 Instytut Napedow I Masz Elektrycznych Komel Wirnik maszyny z magnesami trwałymi
US11462960B2 (en) * 2019-12-02 2022-10-04 Hiwin Mikrosystem Corp. Rotor with first and second permanent magnets having support members and slots

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