WO2021027243A1 - 一种内置式永磁电机转子冲片 - Google Patents

一种内置式永磁电机转子冲片 Download PDF

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Publication number
WO2021027243A1
WO2021027243A1 PCT/CN2020/000082 CN2020000082W WO2021027243A1 WO 2021027243 A1 WO2021027243 A1 WO 2021027243A1 CN 2020000082 W CN2020000082 W CN 2020000082W WO 2021027243 A1 WO2021027243 A1 WO 2021027243A1
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WO
WIPO (PCT)
Prior art keywords
permanent magnet
punching sheet
built
inclined surface
motor rotor
Prior art date
Application number
PCT/CN2020/000082
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English (en)
French (fr)
Inventor
林井福
李爽
吴华江
陈平华
黄立波
金阳洋
李越
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宁波安信数控技术有限公司
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Application filed by 宁波安信数控技术有限公司 filed Critical 宁波安信数控技术有限公司
Publication of WO2021027243A1 publication Critical patent/WO2021027243A1/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
    • 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
    • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
    • 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

Definitions

  • the invention belongs to the technical field of motors, and specifically relates to a built-in permanent magnet motor rotor punching sheet.
  • the traditional built-in permanent magnet motor rotor punching sheet often adopts the design of the outer circle of the rotor as a whole circle or the design of a simple eccentric circle.
  • the air gap of the motor is uniform, although the overall average air gap magnetic density is high, But the problem is that the air gap magnetic density has a large harmonic content and a large harmonic torque.
  • the design of a pure eccentric circle the air gap of the motor is sinusoidally distributed.
  • the air gap magnetic density waveform is relatively sinusoidal, the magnetic density harmonics and The torque harmonic content is greatly reduced, but because the average air gap increases more obviously, the overall average magnetic density is lower, which brings about the problem of a significant decrease in the overall average torque of the motor.
  • the technical problem to be solved by the present invention is to provide a built-in permanent magnet motor rotor punching sheet in view of the current state of the art.
  • the technical solution adopted by the present invention to solve the above-mentioned technical problems is to propose a built-in permanent magnet motor rotor punching sheet, which includes: a punching sheet body with eccentric arcs and bosses arranged at intervals on the periphery, the bosses A first inclined surface, a concentric arc surface and a second inclined surface are arranged in sequence.
  • the center of the concentric arc surface is the same as the center of the punching piece body, and the center of the eccentric arc surface is located on the punching piece body and is connected to the punching piece body.
  • the center of the subject is different.
  • the punching piece body is provided with several groups of permanent magnet placement bodies, and each of the permanent magnet placement bodies includes two permanent magnet slots.
  • the permanent magnet slots are arranged in a V shape, and a magnetic isolation gap is arranged between the two permanent magnet slots.
  • the first inclined surface and the second inclined surface have an included angle ⁇
  • the two permanent magnet slots have an included angle ⁇ .
  • the included angle ⁇ the included angle ⁇ + (5-10) degrees.
  • the included angle ⁇ between the first inclined surface and the second inclined surface is between 80 degrees and 120 degrees.
  • auxiliary slots are provided on the eccentric arc surface.
  • Figure 1 is a plan view of the rotor punching sheet of the built-in permanent magnet motor
  • Figure 2 is an enlarged view of A in Figure 1;
  • the punch main body 1 the eccentric arc surface 2, the first inclined surface 3, the concentric arc surface 4, the second inclined surface 5, the permanent magnet groove 6, the magnetic isolation gap 7, and the auxiliary groove 8.
  • the rotor punching sheet of the built-in permanent magnet motor includes: a punching sheet main body 1, with eccentric arc surfaces 2 and bosses arranged at intervals at the periphery, and the bosses are sequentially provided with first inclined surfaces 3,
  • the center of the concentric arc surface 4 and the second inclined surface 5 is the same as the center of the punch body 1, and the center of the eccentric arc surface 2 is located on the punch body 1 and is different from the center of the punch body 1.
  • the center R of the eccentric arc surface 2 is different from the center of the punch body 1 and the eccentricity is a, which improves the sine of the air gap magnetic field, improves the air gap magnetic density, reduces the torque ripple, and improves the smoothness of the motor operation.
  • a boss is set on the outer circle of the rotor punching piece at the motor's cross-axis magnetic circuit to increase the salient pole rate of the motor, greatly improve the field weakening expansion capability, and increase the power density.
  • the d-axis (Ld) of the permanent magnet motor adopts eccentric circles and the q-axis (Lq) adopts concentric circles, taking into account the average magnetic density and harmonic magnetic density, reducing the average air gap length, and enhancing the air gap magnetic density. Improve performance and achieve a balance between torque and magnetic density.
  • the main body 1 of the punching sheet is provided with a group of permanent magnet placement bodies.
  • a permanent magnet placement body that includes two permanent magnet slots 6 arranged in a V shape between the two permanent magnet slots 6.
  • a magnetic isolation gap 7 is provided between.
  • the permanent magnet slot 6 is used to place one or more permanent magnets.
  • the two permanent magnet slots 6 form a V-shaped permanent magnet placement body, and two or more permanent magnets in the permanent magnet placement body form a permanent magnet pole.
  • the magnetic isolation gap 7 can improve the mechanical strength of the punching sheet, reduce the mechanical stress, and reduce the average air gap. It is also beneficial to the manufacturability of the mold when the mold is opened, and the service life of the mold is improved.
  • the included angle ⁇ changes with the size of the included angle ⁇ .
  • the included angle ⁇ between the first inclined surface 3 and the second inclined surface 5 should be between 80 degrees and 120 degrees.
  • the eccentric arc surface 2 is provided with an auxiliary slot 8 which can reduce the torque fluctuation by eliminating the harmonics of the air gap magnetic density, the harmonics are reduced and the rotation fluctuation is reduced, and the purpose of smooth rotation is achieved.

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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

一种内置式永磁电机转子冲片，包括：冲片主体（1），其周缘处间隔设置有偏心弧面（2）以及凸台，凸台依次设置有第一斜面（3）、同心弧面（4）以及第二斜面（5），同心弧面（4）的圆心与冲片主体（1）的圆心相同，偏心弧面（2）的圆心位于冲片主体（1）上且与冲片主体（1）圆心不同。

Description

一种内置式永磁电机转子冲片 技术领域
本发明属于电机技术领域，具体涉及一种内置式永磁电机转子冲片。
背景技术
传统的内置式永磁电机转子冲片，常采用转子外圆为整圆的设计或者为单纯的偏心圆的设计，整圆设计时，电机气隙均匀，虽然整体的平均气隙磁密高，但是带来的问题是气隙磁密谐波含量大，谐波转矩大，单纯的偏心圆设计时，电机的气隙呈正弦分布，虽然气隙磁密波形较为正弦，磁密谐波和转矩谐波含量大幅降低，但由于平均气隙增大较为明显，整体的平均磁密较低，带来电机整体平均转矩下降明显的问题。
发明内容
本发明所要解决的技术问题是针对现有技术的现状，而提供一种内置式永磁电机转子冲片。
本发明解决上述技术问题所采用的技术方案为：提出一种内置式永磁电机转子冲片，包括：冲片主体，其周缘处间隔设置有偏心弧面以及凸台，所述所述凸台依次设置有第一斜面、同心弧面以及第二斜面，所述同心弧面的圆心与所述冲片主体的圆心相同，所述偏心弧面的圆心位于所述冲片主体上且与冲片主体圆心不同。
在上述的一种内置式永磁电机转子冲片中，所述冲片主体上设置有若干组永磁体置放体，每个所述永磁体置放体均包括两个永磁体槽，两个所述永磁体槽之间呈V形设置，两个所述永磁体槽之间设置有隔磁间隙。
在上述的一种内置式永磁电机转子冲片中，所述第一斜面与所述第二斜面之间具有夹角α，两个所述永磁体槽之间具有夹角β，所述在夹 角α＝夹角β+(5～10)度。
在上述的一种内置式永磁电机转子冲片中，所述第一斜面与所述第二斜面之间的夹角α在80度至120度之间。
在上述的一种内置式永磁电机转子冲片中，所述偏心弧面上开设有辅助槽。
与现有技术相比，本发明的优点在于：
1、减小平均气隙长度，增强气隙磁密，提高性能，完善气隙磁场波形，使电机能够高功率，低波动平稳运行，兼顾转子冲片整圆设计和纯偏心设计的优点；
2、增加凸极率，进而增加磁阻扭矩，提高弱磁扩速能力，增加电机的转矩密度和转矩值；
3、增强转子机械强度，提高高速运行可靠性，并延长冲片寿命。
附图说明
图1是本内置式永磁电机转子冲片的平面视图；
图2是图1中A处放大图；
图中，冲片主体1、偏心弧面2、第一斜面3、同心弧面4、第二斜面5、永磁体槽6、隔磁间隙7、辅助槽8。
具体实施方式
以下是本发明的具体实施例并结合附图，对本发明的技术方案作进一步的描述，但本发明并不限于这些实施例。
如图1和图2所示，本内置式永磁电机转子冲片，包括：冲片主体1，其周缘处间隔设置有偏心弧面2以及凸台，凸台依次设置有第一斜面3、同心弧面4以及第二斜面5，同心弧面4的圆心与冲片主体1的圆心相同，偏心弧面2的圆心位于冲片主体1上且与冲片主体1圆心不同。
偏心弧面2的圆心R与冲片主体1圆心不同且偏心距为a，提高气隙磁场的正弦度，提高气隙磁密，减小转矩波动，提高电机运行的平稳性，设计时一般使最大气隙gmax/最小气隙gmin＝2～3。
电机交轴磁路处的转子冲片外圆设置凸台，提高电机的凸极率，大大提高弱磁扩速能力，提高功率密度，设计时一般使得电机的凸极率在Lq/Ld＝2.8～3左右。
在本申请中，永磁电机中d轴(Ld)采用偏心圆和q轴(Lq)采用同心圆，兼顾平均磁密和谐波磁密，减小平均气隙长度，增强气隙磁密，提高性能，并能够实现转距和磁密之间的平衡。
冲片主体1上设置有若组永磁体置放体，买个永磁体置放体均包括两个永磁体槽6，两个永磁体槽6之间呈V形设置，两个永磁体槽6之间设置有隔磁间隙7。
永磁体槽6用于放置一块或多块永磁体，两个永磁体槽6形成V形永磁体置放体，在永磁体置放体内的两块或者多块永磁体形成一个永磁磁极。
隔磁间隙7能够提高冲片的机械强度，减少机械应力，减小平均气隙，又有利于开模时模具的工艺性，提高模具使用寿命。
第一斜面3与第二斜面5之间具有夹角α，两个永磁体槽6之间具有夹角β，在夹角α＝夹角β+(5～10)度。
在实际使用时，夹角α随夹角β大小而变化，具体来说第一斜面3与第二斜面5之间的夹角α应在80度至120度之间。
偏心弧面2上开设有辅助槽8，辅助槽8能够通过消除气隙磁密的谐波来降低转矩波动，谐波减少进而转动波动变小，实现平稳转动的目的。
本文中所描述的具体实施例仅仅是对本发明精神作举例说明。本发明所属技术领域的技术人员可以对所描述的具体实施例做各种各样的修改或补充或采用类似的方式替代，但并不会偏离本发明的精神所定义的范围。

Claims (5)

  1. 一种内置式永磁电机转子冲片，其特征在于，包括冲片主体，其周缘处间隔设置有偏心弧面以及凸台，所述所述凸台依次设置有第一斜面、同心弧面以及第二斜面，所述同心弧面的圆心与所述冲片主体的圆心相同，所述偏心弧面的圆心位于所述冲片主体上且与冲片主体圆心不同。
  2. 根据权利要求1所述的一种内置式永磁电机转子冲片，其特征在于，所述冲片主体上设置有若干组永磁体置放体，每个所述永磁体置放体均包括两个永磁体槽，两个所述永磁体槽之间呈V形设置，两个所述永磁体槽之间设置有隔磁间隙。
  3. 根据权利要求2所述的一种内置式永磁电机转子冲片，其特征在于，所述第一斜面与所述第二斜面之间具有夹角α，两个所述永磁体槽之间具有夹角β，所述在夹角α＝夹角β+(5～10)度。
  4. 根据权利要求3所述的一种内置式永磁电机转子冲片，其特征在于，所述第一斜面与所述第二斜面之间的夹角α在80度至120度之间。
  5. 根据权利要求1所述的一种内置式永磁电机转子冲片，其特征在于，所述偏心弧面上开设有辅助槽。
PCT/CN2020/000082 2019-08-13 2020-04-21 一种内置式永磁电机转子冲片 WO2021027243A1 (zh)

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CN110504772A (zh) * 2019-08-13 2019-11-26 宁波安信数控技术有限公司 一种内置式永磁电机转子冲片

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107332376A (zh) * 2017-07-31 2017-11-07 广东威灵电机制造有限公司 转子和具有该转子的电机和压缩机
CN107819365A (zh) * 2016-09-13 2018-03-20 南京德朔实业有限公司 转子冲片
CN110504772A (zh) * 2019-08-13 2019-11-26 宁波安信数控技术有限公司 一种内置式永磁电机转子冲片

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107819365A (zh) * 2016-09-13 2018-03-20 南京德朔实业有限公司 转子冲片
CN107332376A (zh) * 2017-07-31 2017-11-07 广东威灵电机制造有限公司 转子和具有该转子的电机和压缩机
CN110504772A (zh) * 2019-08-13 2019-11-26 宁波安信数控技术有限公司 一种内置式永磁电机转子冲片

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