WO2017177740A1 - 一种永磁电动机 - Google Patents

一种永磁电动机 Download PDF

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Publication number
WO2017177740A1
WO2017177740A1 PCT/CN2017/071846 CN2017071846W WO2017177740A1 WO 2017177740 A1 WO2017177740 A1 WO 2017177740A1 CN 2017071846 W CN2017071846 W CN 2017071846W WO 2017177740 A1 WO2017177740 A1 WO 2017177740A1
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Prior art keywords
stator
rotor
permanent magnet
motor
less
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PCT/CN2017/071846
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English (en)
French (fr)
Inventor
张亮亮
张沛
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精进电动科技股份有限公司
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Application filed by 精进电动科技股份有限公司 filed Critical 精进电动科技股份有限公司
Priority to US15/747,426 priority Critical patent/US20190036432A1/en
Priority to JP2017566073A priority patent/JP2018519782A/ja
Priority to EP17781717.8A priority patent/EP3300230A4/en
Publication of WO2017177740A1 publication Critical patent/WO2017177740A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/02—Details of the magnetic circuit characterised by the magnetic material
    • 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
    • H02K1/14—Stator cores with salient poles
    • H02K1/145—Stator cores with salient poles having an annular coil, e.g. of the claw-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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with 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
    • H02K1/27—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
    • H02K1/2753—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
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • 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 present invention relates to the field of electric motors, and more particularly to a permanent magnet electric motor.
  • the currently known motor motor structure includes a stator, a rotor, a rotating shaft, a base, etc.
  • the stator is generally formed by laminating cold-rolled silicon steel sheets with grooves reserved, and windings are installed in the slots.
  • the magnetic permeability of the stator usually has power loss in the alternating magnetic field, and the power loss of the silicon steel sheet as the magnetic conductive material is very large, especially in the high-speed rotational speed region, the power loss may even exceed half of the total power loss of the motor, resulting in the motor. It is less efficient and affects operational safety.
  • the conventional structure of the motor In order to reduce the power loss, the conventional structure of the motor generally adopts a smaller number of poles, for example, 6 poles and 8 poles. Since the number of poles is small, the width of the magnet under each pole of the rotor is large, so the centrifugal force generated is large, Conducive to high-speed operation of the motor.
  • the present invention provides a permanent magnet motor to solve the problem that the current motor has a large power loss and cannot operate at a high speed.
  • the invention provides a permanent magnet motor, which is a radial magnetic field motor, comprising: a stator and a rotor,
  • the inner circumference of the stator is uniformly distributed with N stator teeth in a circumferential direction, one coil is wound around each stator tooth, and N coils constitute a stator winding, wherein N is an integer not less than 12;
  • the stator is made of a plurality of annular sheets of the same shape, and the material of the annular sheet is an amorphous magnetic material.
  • the amorphous magnetically permeable material is an iron-based amorphous alloy.
  • the rotor is made of a plurality of annular sheets of the same shape, and the annular sheet is made of silicon steel;
  • the outer circumference of the rotor is uniformly distributed with M magnetic poles in the circumferential direction, and there are L rotor slots under each magnetic pole, and one magnet is embedded in each rotor slot, wherein M is an even number not less than 12, and L is not less than 1 The integer.
  • the magnetic pole direction of the magnet is perpendicular or oblique to the radial direction of the rotor.
  • stator windings employ a concentrated winding.
  • the invention provides a permanent magnet motor, which is a radial magnetic field type motor, comprising a stator and a rotor, wherein the inner circumference of the stator is uniformly distributed with N stator teeth in the circumferential direction, and each stator tooth is wound around One coil, N coils constitute a stator winding, wherein N is an integer not less than 12.
  • N is an integer not less than 12.
  • the stator is formed by laminating a plurality of annular sheets of the same shape.
  • the material of the annular sheet is an amorphous magnetic material, and the power loss in the alternating magnetic field is lower than that of the silicon steel, which greatly improves the efficiency of the motor.
  • FIG. 1 is a schematic structural view of an electric motor according to an embodiment of the present invention.
  • 1 is a stator
  • 2 is a stator slot
  • 3 is a rotor
  • 4 is a rotor slot
  • 5 is a magnet
  • 6 is a rotating shaft
  • 7 is a stator tooth.
  • an embodiment of the present invention provides a permanent magnet motor, which is a radial magnetic field motor, comprising: a stator 1, a rotor 3 and a rotating shaft 6 .
  • the rotor 3 is mounted on the rotating shaft 6 and can drive the rotating shaft 6 to rotate.
  • the inner circumference of the stator 1 is uniformly distributed with N stator slots in the circumferential direction, wherein N is an integer not less than 12. In a specific embodiment of the invention, N is 18.
  • the stator slot 2 is an open slot located at the edge of the inner circumference of the stator 1 and having an opening facing the rotor 3.
  • stator tooth 7 Two adjacent stator slots 2 form a stator tooth 7, and each stator tooth 7 is wound with a coil (not shown), each coil has a pitch of one pitch, and N coils form a stator winding.
  • the stator windings use concentrated windings. The concentrated winding helps to increase the winding speed and reduce the end height of the winding.
  • the stator 1 is formed by lamination of a plurality of annular sheets of the same shape, the material of which is an amorphous magnetically permeable material.
  • the amorphous magnetically permeable material is an iron-based amorphous alloy. The power loss of the amorphous magnetically permeable material in the alternating magnetic field is lower than that of the silicon steel, which greatly improves the efficiency of the motor, especially when the motor is running at high speed.
  • the rotor 3 is formed by laminating a plurality of annular sheets of the same shape, the material of which is made of silicon steel.
  • the outer circumference of the rotor 3 is provided with M magnetic poles in the circumferential direction, L rotor slots 3 under each magnetic pole, and a magnet 5 is embedded in each rotor slot 3, wherein the number M of the rotor slots is an even number not less than 12
  • the number L of rotor slots per pole is an integer not less than one.
  • the rotor has a total of 12 magnetic poles, two rotor slots under each magnetic pole, and a magnet 5 embedded in each rotor slot, for a total of 24 magnets.
  • the number of magnetic poles here refers to the number of magnetic fields provided in the rotor, wherein each two magnets constitute a reinforced magnetic field. It should be noted that the number of magnetic poles M and the number L of rotor slots per magnetic pole can be flexibly set as needed.
  • the magnetic pole direction of the magnet 5 is inclined with respect to the radial direction of the rotor 3, and the two magnets under each magnetic pole are symmetrically arranged. The magnetic flux of the magnet under each pole converges and passes through the air gap between the stator and the rotor to reach the stator core.
  • the magnetic pole direction of the magnet and the radial direction of the rotor can also be arranged perpendicularly.
  • the number of magnetic poles is 12, and the number of magnets is 24.
  • the number of magnetic poles is large, so that the width and centrifugal force of the magnet 5 under each pole are limited, thereby facilitating high-speed operation of the motor and improving the safety of the motor.
  • the present invention provides a permanent magnet motor, which is a radial magnetic field motor including a stator and a rotor.
  • the inner circumference of the stator is uniformly distributed with N stator teeth in the circumferential direction.
  • One coil is wound around each stator tooth, and N coils constitute a stator winding, wherein N is an integer not less than 12.
  • the number of magnetic poles of the rotor is not less than 12, so that the width and centrifugal force of the magnet under each magnetic pole are limited, thereby facilitating high-speed operation of the motor and improving safety.
  • the stator is formed by laminating a plurality of annular sheets of the same shape.
  • the material of the annular sheet is an amorphous magnetic material, and the power loss in the alternating magnetic field is lower than that of the silicon steel, which greatly improves the efficiency of the motor.

Landscapes

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

Abstract

一种永磁电动机，为径向磁场式电动机，包括定子（1）和转子（3），定子的内圆沿周向均布有N个定子齿（7），每个定子齿上绕有1个线圈，N个线圈组成定子绕组，其中，N为不小于12的整数。同时转子的磁极数不小于12，使得每个磁极下磁铁的宽度和离心力有限，从而有利于电动机高速运行并提高安全性。定子由多个形状相同的环形薄片叠压制成，该环形薄片的材质为非晶导磁材料，其在交变磁场中的功率损耗相对于硅钢较低，提高了电动机的效率。

Description

一种永磁电动机 技术领域
本发明涉及电动机领域，特别涉及一种永磁电动机。
发明背景
目前公知的车用电动机结构包括定子、转子、转轴、机座等，定子一般采用预留有槽的冷轧硅钢片叠压制成，并在槽内安装绕组。但是定子的导磁材料在交变磁场中通常存在功率损耗，而硅钢片作为导磁材料功率损耗数值很大，尤其是在高速转速区域功率损耗甚至会超过电动机功率损耗总和的一半，从而导致电动机的效率较低，并影响到运行安全。传统结构的电动机为了降低功率损耗，普遍采用较少数目的极数，例如6极、8极，由于极数较少，转子每个磁极下磁铁的宽度较大，因此产生的离心力很大，不利于电动机高速运转。
发明内容
鉴于上述问题，本发明提供了一种永磁电动机，以解决现有电动机功率损耗较大，以及无法高速运转的问题。
为达到上述目的，本发明的技术方案是这样实现的：
本发明提供一种永磁电动机，为径向磁场式电动机，包括：定子和转子，
所述定子的内圆沿周向均布有N个定子齿，每个定子齿上绕有一个线圈，N个线圈组成定子绕组，其中，N为不小于12的整数；
所述定子由多个形状相同的环形薄片叠压制成，该环形薄片的材质为非晶导磁材料。
可选地，所述非晶导磁材料为铁基非晶合金。
可选地，所述转子由多个形状相同的环形薄片叠压制成，该环形薄片的材质为硅钢；
所述转子的外圆沿周向均布有M个磁极，每个磁极下有L个转子槽，每个转子槽内嵌有1个磁铁，其中，M为不小于12的偶数，L为不小于1的整数。
可选地，所述磁铁的磁极方向与所述转子的径向垂直或倾斜设置。
可选地，所述定子绕组采用集中式绕组。
本发明的有益效果是：本发明提供一种永磁电动机，为径向磁场式电动机，包括定子和转子，所述定子的内圆沿周向均布有N个定子齿，每个定子齿上绕有1个线圈，N个线圈组成定子绕组，其中，N为不小于12的整数。同时磁极数不小 于12使得每个磁极下磁铁的宽度和离心力有限，从而有利于电动机高速运行并提高安全性。所述定子由多个形状相同的环形薄片叠压制成，该环形薄片的材质为非晶导磁材料，其在交变磁场中的功率损耗相对于硅钢较低，极大地提高了电动机的效率。
上述说明仅是本发明技术方案的概述，为了能够更清楚了解本发明的技术手段，而可依照说明书的内容予以实施，并且为了让本发明的上述和其它目的、特征和优点能够更明显易懂，以下特举本发明的具体实施方式。
附图简要说明
通过阅读下文优选实施方式的详细描述，各种其他的优点和益处对于本领域普通技术人员将变得清楚明了。附图仅用于示出优选实施方式的目的，而并不认为是对本发明的限制。而且在整个附图中，用相同的参考符号表示相同的部件。在附图中：
图1是本发明实施例的电动机的结构示意图。
其中，1为定子，2为定子槽，3为转子，4为转子槽，5为磁铁，6为转轴，7为定子齿。
实施本发明的方式
下面将参照附图更详细地描述本公开的示例性实施例。虽然附图中显示了本公开的示例性实施例，然而应当理解，可以以各种形式实现本公开而不应被这里阐述的实施例所限制。相反，提供这些实施例是为了能够更透彻地理解本公开，并且能够将本公开的范围完整的传达给本领域的技术人员。
如图1所示，本发明实施例提供一种永磁电动机，为径向磁场式电动机，包括：定子1、转子3和转轴6，转子3安装在转轴6上，并能够带动转轴6旋转。定子1的内圆沿周向均布有N个定子槽，其中，N为不小于12的整数。在本发明的一个具体实施例中，N为18。定子槽2为开口槽，位于定子1内圆的边缘，且开口朝向转子3。相邻两个定子槽2形成一个定子齿7，每个定子齿7上绕制有一个线圈(图中未示出)，每个线圈的跨距为一个齿距，N个线圈组成定子绕组，定子绕组采用集中式绕组。集中式绕组有利于提高绕组下线速度，并降低绕组的端部高度。
在本发明的实施例中，定子1由多个形状相同的环形薄片叠压制成，该环形薄片的材质为非晶导磁材料。在本发明的一个实施例中，非晶导磁材料为铁基非晶合金。非晶导磁材料在交变磁场中的功率损耗相对于硅钢较低，极大地提高了电动机的效率，尤其是在电动机高速运转时。
转子3由多个形状相同的环形薄片叠压制成，该环形薄片的材质为硅钢。转子3的外圆沿周向设置有M个磁极，每个磁极下有L个转子槽3，每个转子槽3内嵌有一个磁铁5，其中转子槽个数M为不小于12的偶数，每个磁极下转子槽个数L为不小于1的整数。在本发明实施例中，转子共有12个磁极，每个磁极下有2个转子槽，每个转子槽内嵌有一个磁铁5，共有24个磁铁。这里的磁极数量指的是转子中所设置的磁场数量，其中每两个磁铁构成一个加强的磁场。需要说明的是，磁极个数M和每个磁极下转子槽个数L均可根据需要灵活设置。磁铁5的磁极方向与转子3的径向倾斜设置，每个磁极下的两个磁铁对称设置。每个磁极下的磁铁磁通汇聚后穿过定子与转子之间的气隙到达定子铁芯。当然，磁铁的磁极方向与转子的径向也可垂直设置。
在本发明实施例中，磁极个数为12，磁铁个数为24。在相同尺寸的转子下，磁极个数较多使得每个磁极下磁铁5的宽度和离心力有限，从而有利于电动机高速运行并提高电动机的安全性。
综上所述，本发明实施例的有益效果是：本发明提供一种永磁电动机，为径向磁场式电动机，包括定子和转子，所述定子的内圆沿周向均布有N个定子齿，每个定子齿上绕有1个线圈，N个线圈组成定子绕组，其中，N为不小于12的整数。同时转子磁极数不小于12使得每个磁极下磁铁的宽度和离心力有限，从而有利于电动机高速运行并提高安全性。所述定子由多个形状相同的环形薄片叠压制成，该环形薄片的材质为非晶导磁材料，其在交变磁场中的功率损耗相对于硅钢较低，极大地提高了电动机的效率。
以上所述仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。凡在本发明的精神和原则之内所作的任何修改、等同替换、改进等，均包含在本发明的保护范围内。

Claims (5)

  1. 一种永磁电动机，为径向磁场式电动机，包括：定子和转子，其特征在于，
    所述定子的内圆沿周向均布有N个定子齿，每个定子齿上绕有一个线圈，N个线圈组成定子绕组，其中，N为不小于12的整数；
    所述定子由多个形状相同的环形薄片叠压制成，该环形薄片的材质为非晶导磁材料。
  2. 根据权利要求1所述的永磁电动机，其特征在于，所述非晶导磁材料为铁基非晶合金。
  3. 根据权利要求1所述的永磁电动机，其特征在于，所述转子由多个形状相同的环形薄片叠压制成，该环形薄片的材质为硅钢；
    所述转子的外圆沿周向均布有M个磁极，每个磁极下有L个转子槽，每个转子槽内嵌有1个磁铁，其中，M为不小于12的偶数，L为不小于1的整数。
  4. 根据权利要求3所述的永磁电动机，其特征在于，所述磁铁的磁极方向与所述转子的径向垂直或倾斜设置。
  5. 根据权利要求1所述的永磁电动机，其特征在于，所述定子绕组采用集中式绕组。
PCT/CN2017/071846 2016-04-12 2017-01-20 一种永磁电动机 WO2017177740A1 (zh)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US15/747,426 US20190036432A1 (en) 2016-04-12 2017-01-20 Permanent Magnet Electric Motor
JP2017566073A JP2018519782A (ja) 2016-04-12 2017-01-20 永久磁石電動機
EP17781717.8A EP3300230A4 (en) 2016-04-12 2017-01-20 Permanent magnet motor

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CN105896862A (zh) 2016-08-24

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