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Permanent magnet type motor

一种电动机、永磁式的技术，应用在电动组件、磁路转动零部件、磁路等方向，能够解决齿槽转矩大、无法提高转矩线性度、没有规定转子铁芯外周部厚度等问题，达到转矩线性度提高、齿槽转矩小的效果

Inactive Publication Date: 2006-02-01
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the permanent magnet embedded motor described in the above-mentioned JP-A-2000-197292, since the thickness of the outer peripheral portion of the rotor core is not specified, there arises a problem in that the harmonic component of the air gap magnetic flux density becomes The cogging torque of the torque fluctuation generated when no power is applied is too large, and the torque linearity cannot be improved

Method used

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Embodiment 1

[0030] pass Figure 1 to Figure 3 An embodiment of the present invention will be described. figure 1 is a cross-sectional view of a permanent magnet motor according to an embodiment of the present invention, figure 2 yes figure 1 A cross-sectional view of the rotor of the permanent magnet motor shown, image 3 yes means figure 1 An enlarged partial cross-sectional view of the magnetic flux flow from the rotor to the stator of the permanent magnet motor shown.

[0031] exist figure 1 and figure 2 Among them, the permanent magnet motor 1 has a structure including a stator 10 composed of a stator core 11 obtained by punching out thin electromagnetic steel sheets and laminating the electromagnetic steel sheets, and has a stator core 11 wound on 12 salient poles 11t. The stator coil 13 on the top; and the rotor 20, the rotor 20 has a permanent magnet 31, and is 8 poles, so that n is a positive integer greater than or equal to 1, the pole number of the rotor 20 is 2n, and th...

Embodiment 2

[0063] pass Figure 8 Another example of the present invention will be described. Figure 8 It is a partially enlarged cross-sectional view of an end portion of a rotor of another embodiment of the present invention.

[0064] In addition to cogging torque and torque linearity, an important characteristic of a permanent magnet motor is the maximum rotational speed. If the maximum rotation speed is increased, the machine driven by the motor can be operated at high speed, thereby improving productivity.

[0065] However, if Figure 8 As shown, the magnet hole 22 is provided on the rotor 20, the permanent magnet 31 is inserted into the magnet hole 22, and the permanent magnet motor is fixed with an adhesive. Stress concentration occurs at both end corners of 22 , which adversely affects the fixing of permanent magnet 31 .

[0066] Therefore, in order to solve the above problems, it can be considered as Figure 8 As shown, a bent portion is provided on the magnet hole 22 for i...

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Abstract

A permanent magnet type motor (1) comprises a rotor with fixed permanent magnets (31). The outer periphery of a rotor magnetic pole section (24) of the rotor (20) is so shaped that the distance from the center of the rotor iron core (21) is longest to the circumferential center section, and the distance from the center of the rotor iron core is shortest to the pole gap section, and that the end face of the rotor magnetic pole section (24) forms an arc. When the magnet thickness of the permanent magnet (31) is tm coating thickness tc formed by the outside face of the permanent magnet (31) and the end face of the rotor magnetic pole section (24) is almost constant, an expression tc / tm<=0.25 is satisfied.

Description

technical field [0001] The present invention relates to improvements in cogging torque and torque linearity characteristics in permanent magnet motors with permanent magnets. Background technique [0002] The conventional permanent magnet motor is described according to the official publication No. 62-119175. Such a permanent magnet motor (hereinafter referred to as a "magnet surface motor") has a rotor having a plurality of permanent magnets fixed to the outer peripheral portion of the rotating shaft, spacers between the permanent magnets, and radially pressing the permanent magnets. A pusher made of a non-magnetic material on the surface of a permanent magnet. [0003] According to such a surface magnet motor, since the magnet is fixed to the surface of the rotor, the torque linearity characteristic indicating the linearity of torque and current is excellent. Therefore, since a large torque can be obtained with a small current at a high load, the controllability is excel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/27
CPCH02K1/276
Inventor 菊池友弘宫崎高志米谷晴之山口信一
Owner MITSUBISHI ELECTRIC CORP