WO2013020314A1 - 永磁同步电机 - Google Patents

永磁同步电机 Download PDF

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Publication number
WO2013020314A1
WO2013020314A1 PCT/CN2011/079169 CN2011079169W WO2013020314A1 WO 2013020314 A1 WO2013020314 A1 WO 2013020314A1 CN 2011079169 W CN2011079169 W CN 2011079169W WO 2013020314 A1 WO2013020314 A1 WO 2013020314A1
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Prior art keywords
magnetic
permanent magnet
magnet synchronous
groove
stator
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PCT/CN2011/079169
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English (en)
French (fr)
Inventor
黄辉
胡余生
陈东锁
陈华杰
肖勇
曾学英
张文明
Original Assignee
珠海格力电器股份有限公司
珠海格力节能环保制冷技术研究中心有限公司
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Application filed by 珠海格力电器股份有限公司, 珠海格力节能环保制冷技术研究中心有限公司 filed Critical 珠海格力电器股份有限公司
Priority to EP11870803.1A priority Critical patent/EP2741404B1/en
Priority to US14/235,574 priority patent/US9502933B2/en
Publication of WO2013020314A1 publication Critical patent/WO2013020314A1/zh

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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 permanent magnet synchronous motor.
  • a permanent magnet synchronous motor includes a stator and a rotor.
  • a magnetic steel groove is arranged on the rotor, and a permanent magnet is placed in the magnetic steel groove.
  • the rotor is rotated by the permanent magnet torque and the reluctance torque, such as The following formula shows: Among them, the first one: For reluctance torque, the second term:
  • ⁇ PM i q is the permanent magnet torque
  • ⁇ is the maximum value of the stator-coupled magnetic flux generated by the permanent magnet
  • m is the number of phases of the stator conductor
  • P is the pole number of the motor
  • Ld, Lq are the d-axis and q respectively
  • the shaft inductance, id, iq is the component of the armature current in the d-axis and q-axis directions.
  • the torque is driven to rotate the rotor, and the reluctance torque is sufficiently utilized.
  • the correspondence between the stator teeth and the magnetic channel is relatively random, and the correspondence between the stator teeth and the magnetic channel determines the distribution of the magnetic lines, thereby determining the magnitude of the permanent magnet torque.
  • An object of the present invention is to overcome the deficiencies of the prior art and to provide a permanent magnet synchronous motor.
  • the output torque of the permanent magnet synchronous motor of the present invention is more stable, and the noise and vibration during operation are also reduced.
  • the technical solution is as follows.
  • a permanent magnet synchronous motor comprising a stator and a rotor, wherein a plurality of wire grooves are arranged on the stator in a circumferential direction, a wire turns are arranged in the wire groove, stator teeth are arranged between the adjacent wire grooves, and a plurality of magnetic waves are arranged in the circumferential direction in the rotor
  • the groove group, each magnetic groove group includes at least two magnetic steel grooves, permanent magnets are arranged in the magnetic steel grooves, and magnetic channels are formed between the magnetic steel grooves; one of the adjacent two magnetic channels, one of the magnetic channels The portion is opposite to the wire slot, and the end of the other magnetic channel is opposite to the stator teeth.
  • Both ends of the same magnetic channel are simultaneously opposed to the wire groove, or at the same time, opposite to the stator teeth.
  • one end of the magnetic passage is opposed to the center of the trunk, and the other end of the magnetic passage is opposed to the center of the stator teeth.
  • the magnetic channel is also formed between two adjacent magnetic groove groups.
  • the magnetic steel trough is a radially outwardly facing arcuate groove or U-shaped groove. There is a gap between the two ends of the permanent magnet and the magnetic steel groove.
  • the permanent magnet is in the shape of a flat plate or an arc.
  • the permanent magnet is curved, and the thickness of both ends thereof is gradually thinned.
  • the present invention changes the random correspondence between the stator teeth and the magnetic channel in the prior design, and strictly considers the correspondence between the stator teeth and the magnetic channels.
  • one of the magnetic channels The end is opposite to the slot, and the end of the other magnetic passage is opposite to the stator teeth; during operation, the rotor rotates, and one of the adjacent two magnetic passages initially corresponds to the slot, Corresponding to the stator teeth; the other magnetic channel initially corresponds to the stator teeth and corresponds to the slot; that is, the permanent magnet synchronous motor does not cause a sharp change in the output torque due to the rotation of the rotor,
  • the stability of the output torque of the permanent magnet synchronous motor reduces the noise and vibration of the permanent magnet synchronous motor;
  • FIG. 1 is a cross-sectional view showing a permanent magnet synchronous motor according to a first embodiment of the present invention
  • Figure 2 is a partial enlarged view of Figure 1;
  • stator 1, stator, 2, rotor, 3, trunking, 4, wire ⁇ , 5, stator teeth, 6, magnetic groove group, 7, magnetic steel trough, 8, permanent magnet, 9, magnetic channel.
  • a permanent magnet synchronous motor includes a stator 1 and a rotor 2.
  • a plurality of trunkings 3 are arranged on the stator 1 in a circumferential direction, and a coil 4 is arranged in the linear slot 3, and adjacent trunkings are provided.
  • each magnetic groove group 6 is arranged in the rotor 2 in the circumferential direction, each magnetic groove group 6 includes at least two magnetic steel grooves 7, and a permanent magnet 8 is placed in the magnetic steel groove, each magnetic A magnetic channel 9 is formed between the steel grooves; one of the adjacent two magnetic channels 9 is opposite to the wire groove 3, and the other end of the magnetic channel 9 is opposite to the stator teeth 5.
  • the permanent magnet 8 is divided into two types: an N pole and an S pole.
  • the polarities of the permanent magnets 8 in each magnetic groove group 6 are the same, and the polarities of the permanent magnets 8 in each magnetic groove group 6 are alternately set according to NS.
  • Both ends of the same magnetic channel 9 are simultaneously opposed to the slot 3 or, at the same time, opposite to the stator teeth 5, specifically, the end of one of the two adjacent magnetic paths 9 and the slot 3 Opposite the center, the end of the other magnetic channel 9 is opposite the center of the stator teeth 5.
  • a magnetic channel 9 is also formed between two adjacent magnetic groove groups 6.
  • the magnetic steel groove 7 is a radially outwardly curved groove, and the permanent magnet 8 is also curved, and the thickness of both ends thereof is gradually thinned, and there is a gap between the both ends of the permanent magnet 8 and the magnetic steel groove 7.
  • the present invention changes the random correspondence between the stator teeth 5 and the magnetic channel 9 in the prior design, and strictly considers the correspondence between the stator teeth 5 and the magnetic channels 9, and in the adjacent two magnetic channels 9, One end of the magnetic passage 9 is opposite to the trunking 3, and the other end of the magnetic passage 9 is opposite to the stator teeth 5; during operation, the rotor 2 rotates, and the adjacent two magnetic passages 9 therein A magnetic channel 9 initially corresponds to the slot 3 and corresponds to the stator teeth 5; the other magnetic channel 9 initially corresponds to the stator teeth 5 and corresponds to the slot 3; that is, permanent magnet synchronization
  • the motor does not cause a sharp change in the output torque due to the rotation of the rotor 2, improves the stability of the output torque of the permanent magnet synchronous motor, and reduces the noise and vibration of the permanent magnet synchronous motor;

Landscapes

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

Abstract

一种永磁同步电机，包括定子(1)及转子(2)，在定子(1)上沿周向设有多个线槽(3)，在线槽(3)内设有线圈(4)，相邻的线槽(3)之间为定子齿(5)；在转子(2)内沿周向设有多个磁槽组(6)，各磁槽组(6)包括有至少两个磁钢槽(7)，磁钢槽(7)内放置有永磁体(8)，各磁钢槽(7)之间形成磁通道(9)；相邻的两个磁通道(9)中，其中一个磁通道(9)的端部与线槽(3)相对，另一个磁通道(9)的端部则与定子齿(5)相对。该永磁同步电机的输出转矩更平稳，也降低了运行过程中的噪音及振动。

Description

永磁同步电机
技术领域 本发明涉及一种永磁同步电机。
背景技术 永磁同步电机包括有定子及转子， 在转子上设置有磁钢槽， 磁钢槽内放置有永磁体, 在工作过程中， 依靠永磁转矩及磁阻转矩驱动转子转动， 如以下公式所示：
Figure imgf000003_0001
其中， 第一项:
Figure imgf000003_0002
为磁阻转矩， 第二项:
， Ψ PMi q 为永磁转矩， Ψρηι为永磁体产生的定转子耦合磁通的最大值， m为定子导体的相数， P为电机极对数， Ld、 Lq分别为 d轴和 q轴电感， id、 iq是电枢电流在 d轴、 q轴方向上 的分量。 在实际运用过程中， 在永磁同步电机的定子上设有多个定子齿， 在转子上形成多个磁 通道， 在定子与转子之间 （尤其是定子齿与磁通道之间）形成磁力线， 进而形成转矩驱动 转子转动， 充分地利用磁阻转矩。 而现有的永磁同步电机结构中， 定子齿与磁通道之间的 对应关系比较随意， 而定子齿与磁通道之间的对应关系决定磁力线的分布， 进而决定永磁 转矩的大小， 现有的结构导致永磁同步电机的输出转矩不稳定， 产生较大的噪音及振动。
发明内容 本发明的目的在于克服现有技术的缺陷， 提供一种永磁同步电机， 本发明所述永磁同 步电机的输出转矩更平稳， 也降低了运行过程中的噪音及振动。 其技术方案如下。 一种永磁同步电机， 包括定子及转子， 在定子上沿周向设有多个线槽， 在线槽内设有 线圏， 相邻的线槽之间为定子齿； 在转子内沿周向设有多个磁槽组， 各磁槽组包括有至少 两个磁钢槽， 磁钢槽内放置有永磁体， 各磁钢槽之间形成磁通道； 相邻的两个磁通道中， 其中一个磁通道的端部与线槽相对， 另一个磁通道的端部则与定子齿相对。 下面对本发明进一步技术方案进行说明。 同一所述磁通道的两端同时与线槽相对， 或者， 同时与定子齿相对。 相邻的两个所述磁通道中， 其中一个磁通道的端部与线槽的中心相对， 另一个磁通道 的端部则与定子齿的中心相对。 相邻两个所述磁槽组之间也形成所述磁通道。 所述磁钢槽呈径向朝外的弧形槽或 U形槽。 所述永磁体的两端与所述磁钢槽之间存在间隙。 所述永磁体为平板形或弧形。 所述永磁体为弧形， 其两端的厚度逐渐变薄。 下面对本发明的优点或原理进行说明：
1、 本发明改变现有设计中定子齿与磁通道之间随意的对应关系， 对定子齿及磁通道 之间的对应关系进行严格考虑，相邻的两个磁通道中，其中一个磁通道的端部与线槽相对， 另一个磁通道的端部则与定子齿相对； 在工作过程中， 转子转动， 该相邻的两个磁通道中， 其中一个磁通道最初与线槽相对应， 转为与定子齿相对应； 另一个磁通道最初与定子齿相 对应， 转为与线槽相对应； 也就是说， 永磁同步电机不会由于转子的转动而造成输出转矩 的急剧变化， 提高永磁同步电机输出转矩的稳定性， 降低永磁同步电机的噪音及振动；
2、 所述永磁体的两端与所述磁槽之间存在间隙， 可以防止永磁体的两端退磁。 装配 时避免碰坏永磁体；
3、 所述永磁体两端的厚度逐渐变薄， 既可以防止永磁体退磁， 也防止永磁体在磁槽 内滑动。
附图说明 图 1是本发明实施例一所述永磁同步电机的剖视图； 图 2是图 1的局部放大图； 附图标记说明：
1、 定子， 2、 转子， 3、 线槽， 4、 线圏， 5、 定子齿， 6、 磁槽组， 7、 磁钢槽， 8、 永 磁体, 9、 磁通道。
具体实施方式 下面对本发明的实施例进行详细说明。 如图 1、 图 2所示， 一种永磁同步电机， 包括定子 1及转子 2, 在定子 1上沿周向设 有多个线槽 3 , 在线槽 3内设有线圏 4, 相邻的线槽 3之间为定子齿 5; 在转子 2内沿周向 设有多个磁槽组 6, 各磁槽组 6包括有至少两个磁钢槽 7, 磁钢槽 Ί内放置有永磁体 8 ,各 磁钢槽 Ί之间形成磁通道 9; 相邻的两个磁通道 9中， 其中一个磁通道 9的端部与线槽 3 相对， 另一个磁通道 9的端部则与定子齿 5相对。 其中， 永磁体 8分为 N极及 S极两种， 每个磁槽组 6中的永磁体 8的极性相同， 且各 个磁槽组 6中的永磁体 8的极性按 NS交替设置； 同一磁通道 9的两端同时与线槽 3相对， 或者， 同时与定子齿 5相对， 具体而言， 相邻的两个磁通道 9中， 其中一个磁通道 9的端 部与线槽 3的中心相对， 另一个磁通道 9的端部则与定子齿 5的中心相对。 相邻两个磁槽 组 6之间也形成磁通道 9。 磁钢槽 7呈径向朝外的弧形槽， 永磁体 8也呈弧形，， 其两端的厚度逐渐变薄， 永磁 体 8的两端与磁钢槽 7之间存在间隙。 下面对本发明的优点或原理进行说明：
1、 本发明改变现有设计中定子齿 5与磁通道 9之间随意的对应关系， 对定子齿 5及 磁通道 9之间的对应关系进行严格考虑， 相邻的两个磁通道 9中， 其中一个磁通道 9的端 部与线槽 3相对， 另一个磁通道 9的端部则与定子齿 5相对； 在工作过程中， 转子 2转动， 该相邻的两个磁通道 9中， 其中一个磁通道 9最初与线槽 3相对应， 转为与定子齿 5相对 应； 另一个磁通道 9最初与定子齿 5相对应， 转为与线槽 3相对应； 也就是说， 永磁同步 电机不会由于转子 2的转动而造成输出转矩的急剧变化， 提高永磁同步电机输出转矩的稳 定性， 降低永磁同步电机的噪音及振动；
2、 永磁体 8的两端与磁槽之间存在间隙， 可以防止永磁体 8的两端退磁。 装配时避 免碰坏永磁体 8;
3、 永磁体 8两端的厚度逐渐变薄， 既可以防止永磁体 8退磁， 也防止永磁体 8在磁 槽内滑动。 以上仅为本发明的具体实施例， 并不以此限定本发明的保护范围； 在不违反本发明构 思的基础上所作的任何替换与改进， 均属本发明的保护范围。

Claims

权利要求
1、 一种永磁同步电机， 包括定子及转子， 在定子上沿周向设有多个线槽， 在线槽内 设有线圏， 相邻的线槽之间为定子齿； 在转子内沿周向设有多个磁槽组， 各磁槽组包括有 至少两个磁钢槽， 磁钢槽内放置有永磁体， 各磁钢槽之间形成磁通道； 其特征在于， 相邻 的两个磁通道中， 其中一个磁通道的端部与线槽相对， 另一个磁通道的端部则与定子齿相 对。
2、 如权利要求 1所述的永磁同步电机， 其特征在于， 同一所述磁通道的两端同时与 线槽相对， 或者， 同时与定子齿相对。
3、 如权利要求 1所述的永磁同步电机， 其特征在于， 相邻的两个所述磁通道中， 其 中一个磁通道的端部与线槽的中心相对， 另一个磁通道的端部则与定子齿的中心相对。
4、 如权利要求 1至 3中任一项所述的永磁同步电机， 其特征在于， 相邻两个所述磁 槽组之间也形成所述磁通道。
PCT/CN2011/079169 2011-08-05 2011-08-31 永磁同步电机 WO2013020314A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP11870803.1A EP2741404B1 (en) 2011-08-05 2011-08-31 Permanent magnet synchronous electric machine
US14/235,574 US9502933B2 (en) 2011-08-05 2011-08-31 Permanent magnet synchronous electric machine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201110223492.7 2011-08-05
CN201110223492.7A CN102790502B (zh) 2011-08-05 2011-08-05 永磁同步电机

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US (1) US9502933B2 (zh)
EP (1) EP2741404B1 (zh)
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WO (1) WO2013020314A1 (zh)

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