Fractional-slot SPMSM magnetic pole structure optimization design method for reducing unbalanced magnetic pull

Abstract

The invention relates to a fractional-slot SPMSM magnetic pole structure optimization design method for reducing unbalanced magnetic pull. The method comprises the following steps of: determining theinitial magnetic pole structure of a motor to be a 90-degree parallel magnetized equal-thickness magnetic pole structure; providing the magnetic pole improvement scheme of the motor, and adopting a magnetizing direction-changed unequal-thickness magnetic pole structure; selecting a Taguchi method as a magnetic pole structure optimization design. According to the Taguchi method, the pole-arc coefficient of original magnetic poles, namely an optimization variable A, the distance of the deviation of the outer arc centers of the magnetic poles from the center of the motor, namely an optimization variable B, a magnetizing direction, namely an optimization variable C and different magnetic pole shapes, namely an optimization variable D are used as optimization variables, and torque ripple reduction and unbalanced magnetic pull reduction are used as optimization objectives. According to the method, the influence of the change of each optimization variable on unbalanced magnetic pull, torque ripple and result robustness is analyzed; the magnetic pole structure of a fractional-slot SPMSM is optimized; the unbalanced magnetic pull and torque ripple of the motor can be effectively reduced byusing the optimized structure, and the operation stability of the motor is improved.

Description

technical field [0001] The invention belongs to the field of motor optimization design, in particular to a fractional slot SPMSM (surface-mounted permanent magnet synchronous motor) magnetic pole structure optimization design method for reducing unbalanced magnetic pulling force, which can be used to reduce the magnetic poles in the fractional slot SPMSM of unbalanced magnetic pulling force Optimal design of structural variables. Background technique [0002] SPMSM has the advantages of simple structure, low manufacturing cost, and convenient installation, and has been widely used in practical engineering. The use of fractional slot windings can reduce cogging torque and torque ripple, increase the smoothness of motor operation, and reduce vibration, noise and control difficulties caused by cogging torque. When there is a magnetic field in the motor, a magnetic pull will be generated between the stator and the rotor of the motor. In the fractional slot motor, since the numb...

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Problems solved by technology

Although global optimization makes the obtained optimal solution valid in the entire function area, the determination process of the objective function is very complicated, and the calculation is large and time-consuming. Although local optimization cannot obtain the overall optimal solution for all areas in the function value space solution, but its calculation is simple and easy to understand

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