WO2015070551A1 - 一种减小面贴式永磁转子转矩脉动的永磁电机结构 - Google Patents

一种减小面贴式永磁转子转矩脉动的永磁电机结构 Download PDF

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Publication number
WO2015070551A1
WO2015070551A1 PCT/CN2014/073542 CN2014073542W WO2015070551A1 WO 2015070551 A1 WO2015070551 A1 WO 2015070551A1 CN 2014073542 W CN2014073542 W CN 2014073542W WO 2015070551 A1 WO2015070551 A1 WO 2015070551A1
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WO
WIPO (PCT)
Prior art keywords
rotor
permanent magnet
motor structure
sheath
torque pulsation
Prior art date
Application number
PCT/CN2014/073542
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English (en)
French (fr)
Inventor
刘长红
Original Assignee
中山大洋电机股份有限公司
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Application filed by 中山大洋电机股份有限公司 filed Critical 中山大洋电机股份有限公司
Publication of WO2015070551A1 publication Critical patent/WO2015070551A1/zh
Priority to US14/840,042 priority Critical patent/US9806590B2/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
    • 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
    • H02K1/08—Salient poles
    • 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • 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
    • H02K1/26—Rotor cores with slots for windings
    • 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
    • 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
    • H02K1/2746—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 arranged with the same polarity, e.g. consequent pole type
    • 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
    • H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
    • 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
    • H02K1/278—Surface mounted magnets; Inset magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator

Definitions

  • Permanent magnet motor structure for reducing torque ripple of surface-mounted permanent magnet rotor
  • the utility model relates to a permanent magnet motor structure for reducing torque ripple of a surface-mounted permanent magnet rotor.
  • the utility model relates to a surface-mounted permanent magnet rotor and a fractional-slot concentrated winding permanent magnet motor, and proposes a new technical scheme for reducing torque ripple of an automobile motor from the perspective of motor design.
  • the outstanding advantages of the surface-mounted permanent magnet rotor and the fractional-slot concentrated winding permanent magnet motor are short axial length and high torque density. It is especially suitable for low-speed and high-torque applications where the axial length of the motor is strictly required, such as electric power steering. system.
  • the main drawback of this type of motor is that the spatial distribution of the stator magnetic potential has a large harmonic component, with the 5th and 7th harmonics being dominant.
  • the 6th-order torque ripple generated by the interaction of the 5th and 7th harmonics with the fundamental component of the rotor's magnetic field is the most important component of the torque ripple of this type of motor.
  • stator chute or rotor segmented bevel stator crown slot, rotor surface arc modification, and the like.
  • stator chute or the rotor segment oblique pole is similar to the utility model.
  • stator chute or the rotor segmented slant pole has certain limitations for the concentrated winding with a small number of slots. The main problem is that the number of slots is small and the required axial misalignment angle is large, which results in a large fundamental torque. The magnitude is reduced.
  • the stator crown groove and the rotor surface arc modification have some improvement on the stator cogging torque fluctuation, but the 6th harmonic pulse action is not large, and the sixth harmonic pulsation torque ripple component is most relevant.
  • the overall torque ripple of the motor so the traditional technical solutions have not solved this problem well.
  • the object of the present invention is to provide a permanent magnet motor structure for reducing the torque ripple of a surface-mounted permanent magnet rotor.
  • the structure is simple, easy to implement, small torque ripple, high fundamental torque, and smoother motor operation.
  • a permanent magnet motor structure for reducing torque ripple of a surface-mounted permanent magnet rotor comprising a stator assembly and a rotor assembly, wherein the stator assembly includes a stator core and a coil winding, the stator core including a yoke portion and a yoke portion extending from the yoke portion a plurality of tooth portions, a wire groove is formed between adjacent tooth portions, and the rotor assembly comprises a rotor core and a plurality of permanent magnets mounted on a surface of the rotor core, and the plurality of permanent magnets are spaced apart by an N pole S pole, and are characterized by: A rotor sheath is mounted on the outside of the rotor assembly, and the rotor sheath is divided into at least two sections in the axial direction. The magnetic permeability of the first section of the rotor sheath is different from that of the first section of the rotor sheath.
  • the one segment described above is a magnetic material sheath, and the other segment is a non-magnetic material sheath, and the inner surfaces of the crowns of the tooth portions described above form a chamfered portion on both sides.
  • the permanent magnet described above is a salient-pole-mounted permanent magnet.
  • the ratio of the number of grooves of the wire groove described above to the number of pole pairs of the permanent magnet is a fraction.
  • stator assembly described above is a fractional slotted stator assembly.
  • the rotor assembly described above is an inner rotor assembly or an outer rotor assembly.
  • the ratio of the number of grooves of the wire groove described above to the number of poles of the permanent magnet is 18:14.
  • the magnetic material sheath and the non-magnetic material sheath described above have the same radial thickness and axial length. Compared with the prior art, the utility model has the following effects:
  • the rotor assembly includes a rotor core and a plurality of permanent magnets mounted on a surface of the rotor core, and a rotor jacket is mounted on the outside of the rotor assembly, the rotor sheath being divided into at least two sections in the axial direction: the first section of the rotor sheath
  • the magnetic permeability is different from that of the second rotor sheath. Due to the magnetic permeability of the magnetic material, the magnetic material sheath has a certain degree of skew distribution in the sheath compared to the non-magnetic material sheath.
  • the 5th and 7th harmonic magnetic fields penetrate the two types of rotor sheaths to generate the reverse phase angle, which causes the torque ripple generated by the two sections of the rotor assembly to react, thus reducing the overall torque ripple.
  • the sixth harmonic torque is reduced, and the fundamental torque loss rate is extremely small.
  • the chamfered portions are formed on both sides of the inner surface of the crown of the tooth portion described above, thereby changing the air gap permeation distribution, further reducing the torque ripple.
  • the permanent magnet is a salient-pole-mounted permanent magnet, which increases the magnetic flux density waveform of the rotor magnetic field, so that the output torque of the motor can be increased to a certain amount.
  • the ratio of the number of grooves in the welt groove to the number of pole pairs of the permanent magnet is a fraction, and the centralized winding fractional groove design is used to minimize the total axial length, which can reduce the volume and reduce the cost, and at the same time help to further reduce the torque ripple. .
  • 1 is an exploded view of the first embodiment of the present invention.
  • Figure 2 is a perspective view of the first embodiment of the present invention.
  • Figure 3 is a side elevational view of the first embodiment of the present invention.
  • Figure 4 is a cross-sectional view taken along line A-A of Figure 3;
  • Figure 5 is a partial enlarged view of Figure 4.
  • Figure 6 is a plan view of the rotor of the first embodiment of the present invention.
  • Figure 7 is a cross-sectional view taken along line B-B of Figure 6;
  • Figure 8 is a perspective view of the rotor of the second embodiment of the present invention.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • a permanent magnet motor structure for reducing torque ripple of a surface-mounted permanent magnet rotor comprising a stator assembly 1 and a rotor assembly 2, wherein the stator assembly 1 includes a stator core 11 and a coil winding 12, the stator core 11 includes a yoke portion 11 and a plurality of tooth portions 112 extending from the yoke portion, and a welt groove 11 is formed between adjacent tooth portions 111.
  • the rotor assembly 2 includes a rotor core 21 and a plurality of permanent magnets 22 mounted on a surface of the rotor core 21, and a plurality of permanent magnets are spaced apart at an N pole S pole, characterized in that a rotor guard is mounted on the outside of the rotor assembly 2.
  • the sleeve is divided into two sections in the axial direction. The magnetic permeability of the first section of the rotor sheath 23 is different from that of the second section of the rotor sheath 24.
  • the first section of the rotor sheath 23 is a magnetic material sheath
  • the second section The rotor sheath 24 is a non-magnetic material sheath
  • the inner surface of the crown of the tooth portion 112 forms a chamfered portion 1121 on both sides of the tooth surface
  • the body 22 is a salient-pole-mounted permanent magnet
  • the number of slots of the welt groove 11 3 is
  • the pole-to-number ratio of the permanent magnets 22 is a fraction
  • the stator assembly 1 is a fractional slot
  • the stator assembly, the rotor assembly is an inner rotor assembly or an outer rotor assembly, and the ratio of the number of slots of the welt groove 113 to the number of pole pairs of the permanent magnet is 18:7, and the magnetic material sheath and the non-magnetic material sheath have the same Radial thickness and axial length.
  • Embodiment 2 Embodiment 2:
  • the embodiment is improved on the basis of the first embodiment, and the structure is basically the same as the embodiment.
  • the rotor sheath is divided into three sections in the axial direction, the magnetic permeability of the first section of the rotor sheath 23 is different from that of the second section rotor sheath 24 and the third section rotor sheath 25, and the rotor
  • the magnetic permeability of the sheath is arranged from large to small.
  • the utility model has the following advantages: the rotor sheath is divided into at least two sections along the axial direction, the magnetic permeability of the first section of the rotor sheath 23 is different from that of the second section of the rotor sheath 24, and the magnetic permeability of the rotor sheath is arranged from large to small.
  • the structure is simple and easy to implement. Due to the magnetic permeability effect of the magnetic material, the magnetic field has a certain skew distribution with the non-magnetic material sheath compared with the air gap magnetic sleeve.
  • the effect of reducing the torque ripple of the surface-mounted permanent magnet rotor is the best, and the crown of the stator tooth portion 1 12
  • the cut surface portion 1 1 21 is formed on both sides of the inner surface, thereby changing the air gap magnetic permeability distribution, further reducing the torque ripple, and the 7-body 22 is a salient-pole-mounted permanent magnet, thereby increasing the magnetic flux density waveform of the rotor magnetic field, so that The output torque of the motor can be increased to a certain amount.
  • the ratio of the number of slots of the welt groove 1 1 3 to the number of pole pairs of the permanent magnet 22 is a fraction, and the concentrated winding fraction slot design is used to minimize the total axial length. Reducing the volume reduces the cost and at the same time helps to further reduce the torque ripple.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

一种减小面贴式永磁转子转矩脉动得永磁电机结构，包括定子组件（1）和转子组件（2），其中定子组件（1）包括定子铁芯（11）和线圈绕组（12），定子铁芯（11）包括轭部（111）和从轭部（111）伸出的若干个齿部（112），相邻齿部（112）之间形成嵌线槽（113），转子组件（2）包括转子铁芯（21）和安装在转子铁芯（21）的表面的若干个永磁体（22），若干永磁体（22）按N极S极间隔分布，在转子组件（2）的外面安装有转子护套（23），转子护套（23）沿轴向至少分成两段，第一段转子护套（23）的导磁性与第二段转子护套（24）导磁性不同。该电机结构简单、易于实现，转矩脉动小、基波转矩高，使电机运行更加平稳。

Description

一种减小面贴式永磁转子转矩脉动的永磁电机结构
技术领域 ：
本实用新型涉及一种减小面贴式永磁转子转矩脉动的永磁电机结构。
背景技术 ：
本实用新型针对面贴式永磁转子、 分数槽集中绕组永磁电机， 从电机设计 的角度提出减小汽车电机转矩脉动的新技术方案。
面贴式永磁转子、分数槽集中绕组永磁电机的突出优点是轴向长度短而转 矩密度高， 特别适合对电机轴向长度有严格要求的低速大转矩应用领域， 例如 电动助力转向系统。 该类电机的主要缺陷是定子磁势的空间分布谐波分量较 大， 其中以 5， 7次谐波为主。 该 5， 7次谐波与转子磁场的基波分量相互作用产 生的 6次转矩脉动是该类电机转矩脉动最主要成份。
现有的减小转矩脉动的措施包括： 定子斜槽或转子分段斜极、 定子齿冠开 槽、 转子表面圆弧改型等等。 其中， 定子斜槽或转子分段斜极和本实用新型作 用类似。 但是， 定子斜槽或转子分段斜极对于槽数较少的集中绕组有一定局限 性， 其主要问题是由于槽数少， 需要的轴向错位角度较大， 由此导致基波转矩 大幅度减少。 定子齿冠开槽和转子表面圆弧改型对定子齿槽定位力矩波动有一 定改善， 但是对 6 次谐波脉动作用不大， 而这第六阶谐波脉动得转矩脉动分量 最关系到电机的整体的转矩脉动， 所以， 传统的技术方案均未能较好解决该问 题。
发明内容 ：
本实用新型的目的是提供一种减小面贴式永磁转子转矩脉动的永磁电机结构 它结构简单、 易于实现、 转矩脉动小、 基波转矩高、 使电机运行更加平稳。
本实用新型的目的是通过下述技术方案予以实现的：
一种减小面贴式永磁转子转矩脉动的永磁电机结构， 包括定子组件和转子 组件， 其中定子组件包括定子铁芯和线圈绕组， 定子铁芯包括轭部和从轭部伸 出的若干个齿部， 相邻齿部之间形成嵌线槽， 转子组件包括转子铁芯和安装在 转子铁芯的表面的若干永磁体， 若干永磁体按 N极 S极间隔分布， 其特征在于： 在转子组件的外面安装有转子护套， 转子护套沿轴向至少分成两段， 第一段转 子护套的导磁性与第一段转子护套导磁性不同。
上述所述的一段为磁性材料护套， 另一段为非磁性材料护套， 上述所述的 齿部的齿冠的内表面两侧形成切角部。 上述所述的永磁体是凸极面贴式永磁体。
上述所述的嵌线槽的槽数与永磁体的极对数之比是分数。
上述所述的定子组件是由分数槽条形定子组件。
上述所述的转子组件是内转子组件或者是外转子组件。
上述所述的嵌线槽的槽数与永磁体的极数之比是 18 : 14。
上述所述的磁性材料护套和非磁性材料护套有相同的径向厚度和轴向长度。 本实用新型与现有技术相比， 具有如下效果：
1 )转子组件包括转子铁芯和安装在转子铁芯的表面的若干永磁体， 在转子 组件的外面安装有转子护套， 转子护套沿轴向至少分成两段： 第一段转子护套 的导磁性与第二段转子护套导磁性不同。 磁性材料护套由于磁性材料的导磁效 应， 与非磁性材料护套相比， 磁场在护套内产生一定程度的偏斜分布。 通过合 理设计， 使 5 , 7次谐波磁场穿透两种类型转子护套后产生反相位角， 导致的转 子组件两段产生的转矩脉动产生反作用， 从而消减总体的转矩脉动， 大大减少 六次谐波转矩， 而基波转矩损失率极小。
2 )上述所述的齿部的齿冠的内表面两侧形成切角部， 从而改变气隙磁导分 布， 进一步降低转矩脉动。
3 )永磁体是凸极面贴式永磁体， 提高转子磁场的磁通密度波形， 使电机的 输出转矩可以增加到一定量。
4 )嵌线槽的槽数与永磁体的极对数之比是分数， 釆用集中绕组分数槽设计 来最小化总的轴向长度， 可以缩小体积降低成本， 同时有利于进一步降低转矩 脉动。
5 )转子护套沿轴向分成两段时一段为磁性材料护套， 另一段为非磁性材料护 套， 结构简单， 选材容易。 附图说明：
图 1 是本实用新型实施例一的分解图。
图 2 是本实用新型实施例一的立体图。
图 3 是本实用新型实施例一的侧视图图。
图 4是图 3的 A-A剖视图。
图 5是图 4的局部放大图。
图 6本实用新型实施例一的转子的俯视图。
图 7本图 6的 B-B剖视图；
图 8 是本实用新型实施例二的转子的立体图。
具体实施方式：
下面通过具体实施例并结合附图对本实用新型作进一步详细的描述。
实施例一：
如图 1、 图 2、 图 3、 图 4、 图 5、 图 6、 图 7所示， 一种减小面贴式永磁 转子转矩脉动的永磁电机结构， 包括定子组件 1和转子组件 2 , 其中定子组件 1 包括定子铁芯 11和线圈绕组 12 , 定子铁芯 11包括轭部 1 11和从轭部伸出的若 干个齿部 112 , 相邻齿部 111之间形成嵌线槽 11 3 , 转子组件 2包括转子铁芯 21 和安装在转子铁芯 21的表面的若干永磁体 22 ,若干永磁体按 N极 S极间隔分布， 其特征在于:在转子组件 2的外面安装有转子护套， 转子护套沿轴向分成两段， 第一段转子护套 23的导磁性与第二段转子护套 24导磁性不同， 第一段转子护 套 23为磁性材料护套， 第二段转子护套 24为非磁性材料护套， 齿部 112的齿 冠的内表面两侧形成切角部 1121 , 7 兹体 22是凸极面贴式永磁体， 嵌线槽 11 3 的槽数与永磁体 22的极对数之比是分数，定子组件 1是由分数槽条形定子组件, 转子组件是内转子组件或者是外转子组件， 嵌线槽 11 3的槽数与永磁体的极对 数之比是 18 : 7 ,磁性材料护套和非磁性材料护套有相同的径向厚度和轴向长度。 实施例二：
如图 8所示， 本实施例在实施例一基础上进行改进， 结构基本与实施例的 相同， 唯一不同点是： 转子护套沿轴向分成三段， 第一段转子护套 23的导磁性 与第二段转子护套 24和第三段转子护套 25导磁性是不同， 且转子护套导磁性 从大到小排列.
本实用新型： 转子护套沿轴向至少分成两段， 第一段转子护套 23的导磁 性与第二段转子护套 24导磁性是不同的， 且转子护套导磁性从大到小排列， 结 构简单、 易于实现， 磁性材料护套由于磁性材料的磁导效应， 磁场在气隙磁套 相比， 与非磁性材料护套具有一定的偏斜分布的影响。 磁场穿透两种类型转子 护套后产生反相位角， 导致的转子组件两段产生的转矩脉动产生的反作用， 从 而消减总体的转矩脉动， 将大大减少第六次谐波转矩， 基波转矩高。另外， 磁性 材料护套与非磁性材料护套具有相同的径向厚度和轴向长度时， 减小面贴式永 磁转子转矩脉动的效果是最好的， 定子齿部 1 12的齿冠的内表面两侧形成切角 部 1 1 21 , 从而改变气隙磁导分布， 进一步降低转矩脉动， 7 兹体 22是凸极面贴 式永磁体， 提高转子磁场的磁通密度波形， 使电机的输出转矩可以增加到一定 量， 嵌线槽 1 1 3的槽数与永磁体 22的极对数之比是分数， 釆用集中绕组分数槽 设计来最小化总的轴向长度， 可以缩小体积降低成本， 同时有利于进一步降低 转矩脉动。

Claims

权利要求
1、 一种减小面贴式永磁转子转矩脉动的永磁电机结构， 包括定子组件和转 子组件， 其中定子组件包括定子铁芯和线圈绕组， 定子铁芯包括轭部和从轭部 伸出的若干个齿部， 相邻齿部之间形成嵌线槽， 转子组件包括转子铁芯和安装 在转子铁芯的表面的若干永磁体， 若干永磁体按 N极 S极间隔分布， 其特征在 于:在转子组件的外面安装有转子护套， 转子护套沿轴向至少分成两段， 第一段 转子护套的导磁性与第二段转子护套导磁性不同。
2、 根据权利要求 1所述的一种减小面贴式永磁转子转矩脉动的永磁电机结 构， 其特征在于一段为磁性材料护套， 另一段为非磁性材料护套。
3、 根据权利要求 2所述的一种减小面贴式永磁转子转矩脉动的永磁电机结 构， 其特征在于：齿部的齿冠的内表面两侧形成切角部。
4、根据权利要求 1或 2或 3所述的一种减小面贴式永磁转子转矩脉动的永 磁电机结构， 其特征在于：永磁体是凸极面贴式永磁体。
5、 根据权利要求 4所述的一种减小面贴式永磁转子转矩脉动的永磁电机结 构， 其特征在于：嵌线槽的槽数与永磁体的极对数之比是分数。
6、 根据权利要求 5所述的一种减小面贴式永磁转子转矩脉动的永磁电机结 构， 其特征在于:定子组件是由分数槽条形定子组件。
7、 根据权利要求 5所述的一种减小面贴式永磁转子转矩脉动的永磁电机结 构， 其特征在于：转子组件是内转子组件或者是外转子组件。
8、 根据权利要求 5所述的一种减小面贴式永磁转子转矩脉动的永磁电机结 构， 其特征在于：嵌线槽的槽数与永磁体的极数之比是 18 : 14。
9、 根据权利要求 2所述的一种减小面贴式永磁转子转矩脉动的永磁电机结 构， 其特征在于： 磁性材料护套和非磁性材料护套有相同的径向厚度和轴向长 度。
PCT/CN2014/073542 2013-11-12 2014-03-17 一种减小面贴式永磁转子转矩脉动的永磁电机结构 WO2015070551A1 (zh)

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