Method for optimizing Halbach array permanent magnet motor split ratio and magnetization angle
A permanent magnet motor and array technology, applied in the manufacture of motor generators, electrical components, electromechanical devices, etc., can solve problems such as crack ratio optimization analysis, and achieve the effect of improving electromagnetic torque density, optimizing motor performance, and improving electromagnetic performance.
Active Publication Date: 2019-12-10
HEFEI UNIV OF TECH
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However, the motor only analyzes the magnetization angle, and does not optimize the split ratio
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[0044] Such as figure 1 As shown, a method for optimizing the split ratio and magnetization angle of a Halbach array permanent magnet motor includes the following steps:
[0045] (1) Through the functional expression of the no-load radial air gap magnetic density of the slotless permanent magnet motor, the functional expression of the no-load radial air gap magnetic density of the slotted permanent magnet motor is calculated by using the Carter coefficient method, and the torque Expression, deduce the functional relationship of electromagnetic torque density with respect to split ratio and magnetization angle;
[0046] (2) Set the magnetization angle as a different constant, only differentiate the electromagnetic torque density with respect to the split ratio and set its value to zero, and obtain the optimal split ratio under different magnetization angles;
[0047] (3) Set the split ratio to different constants, only differentiate the electromagnetic torque density with resp...
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The invention discloses a method for optimizing a Halbach array permanent magnet motor split ratio and a magnetization angle. The method is characterized by firstly, deriving an expression of electromagnetic torque density with respect to the split ratio and the magnetization angle; then setting the magnetization angle to be different constants, using the electromagnetic torque density to carry out differential on the split ratio, and setting a value to be zero to obtain the optimal split ratio under the different magnetization angles; setting the split ratio to be different constants, using the electromagnetic torque density to carry out differential on the magnetization angle, and setting the value to be zero to obtain the optimal magnetization angle under the different split ratios; andfinally, using the electromagnetic torque density to carry out differential on the split ratio and the magnetization angle at the same time and setting the value to be zero to obtain the globally optimal split ratio and magnetization angle, obtaining the globally optimal electromagnetic torque density and optimizing a motor parameter so as to improve the electromagnetic performance of the motor.
Description
technical field [0001] The invention relates to the technical field of permanent magnet motors, in particular to a method for optimizing the split ratio and magnetization angle of a Halbach array permanent magnet motor. Background technique [0002] The permanent magnet brushless motor has the advantages of small size, simple structure, high efficiency, high power factor, etc., and is widely used in industry, agriculture, military industry and other fields. Halbach permanent magnet motors are mainly surface-mounted permanent magnet motors, which can be divided into two sections, three sections and up to n sections. Theoretically, the more segments there are, the air-gap flux density will be close to a sine wave. However, if there are too many permanent magnet segments, it will be more difficult to realize in engineering. Therefore, mostly only two-stage and three-stage Halbach permanent magnet motors are used in actual motors. [0003] Chinese patent 201711077852.0 disclos...
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IPC IPC(8): H02K15/00
CPCH02K15/0006
Inventor 倪有源刘志伟江昕
Owner HEFEI UNIV OF TECH