Double-stator permanent magnet synchronous motor torque ripple weakening method based on unilateral Halbach array

Abstract

The invention discloses a double-stator permanent magnet synchronous motor torque ripple weakening method based on a single-side Halbach array. A double-stator permanent magnet synchronous motor is divided into an inner motor and an outer motor based on a superposition method; respectively carrying out finite element simulation calculation on the two split motors to obtain amplitudes of main harmonic components in torques of the internal and external motors; the structure of the inner motor is not changed, and a permanent magnet of the outer motor is changed into a five-section magnetized Halbach array; the magnetizing angle of the magnetic pole in the middle of the Halbach array is 90 degrees, and the magnetizing angles of the two magnetic poles on the same side of the middle magnetic pole are optimized step by step through finite elements to obtain the optimal magnetizing angle. According to the invention, the torque pulsation of the motor can be obviously reduced.

Description

technical field [0001] The invention relates to the technical field of motor design methods, in particular to a torque pulsation weakening method for a surface-mounted radially magnetized double-stator permanent magnet synchronous motor with the same number of inner and outer stator slots and a 90° electrical angle deviation of the inner and outer stator positions. Background technique [0002] Torque ripple is a key indicator to characterize the stability of the output torque of the motor. The lower the torque ripple, the more stable the output torque of the motor, the less likely it is to change with time, and the smaller the fluctuation. [0003] In the traditional single-stator permanent magnet synchronous motor, the use of the Halbach permanent magnet array is a good means to reduce the torque ripple of the motor. Similarly, the motor with double stator topology can also use this method to reduce the torque ripple, but a On the one hand, the cost of the Halbach array is...

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Problems solved by technology

[0003] In the traditional single-stator permanent magnet synchronous motor, the use of Halbach permanent magnet array is a good means to reduce the torque ripple effect of the motor. Similarly, the double-stator topology motor can also use this method to reduce torque ripple, but a On the one hand, the cost of the Halbach array is relatively high. On the other hand, the torque ripple of the double-stator motor is jointly determined by the inner and outer motors. Since the outer motor usually has a larger torque ripple, the permanent magnet of the outer motor can be replaced with a Halbach array to adjust the array’s torque. The magnetization angle is used to reduce the torque ripple, but because of the double stator structure, the search for the magnetization angle is different from the case of a single stator

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