A fast analysis method for high-frequency vibration of multi-phase permanent magnet motor and its suppression strategy

Abstract

The present application discloses a fast analysis method for high-frequency vibration of a multi-phase permanent magnet motor and a suppression strategy thereof. The method includes: S1. Analytical calculation of current harmonics of a multi-phase permanent magnet motor powered by a PWM inverter; S2. Calculation of the electromagnetic force on each tooth of the motor stator by using the permeance distribution characteristic function method; S3. Two-dimensional Fourier decomposition For the electromagnetic force on the motor stator, the high-frequency component of the zero-order electromagnetic force is selected as the reference quantity, and the high-frequency vibration of the motor is indirectly analyzed. Compared with the existing circuit and electromagnetic field simulation analysis methods, the rapid analysis method for high-frequency vibration of multi-phase permanent magnet motors described in this scheme has clear and intuitive physical concepts, high calculation efficiency, and strong versatility. Using the high-frequency vibration fast method of the multi-phase permanent magnet motor, a high-frequency vibration suppression strategy based on carrier phase shifting is determined, which realizes the offset of the high-frequency electromagnetic force of the motor introduced by PWM, and then suppresses the high-frequency electromagnetic force of the motor. vibration noise.

Description

technical field [0001] The present application relates to the technical field of permanent magnet motors, and in particular, to a method for rapid analysis of high-frequency vibration of a multi-phase permanent magnet motor and a suppression strategy thereof. Background technique [0002] Permanent magnet motors have the advantages of high power density, high efficiency, simple structure, and easy control, and have been widely used in various power levels. [0003] The multi-phase permanent magnet motor has a large number of winding phases, and the armature reaction magnetomotive force has a high sine degree. Therefore, compared with the traditional three-phase permanent magnet motor, the multi-phase permanent magnet motor has better performance in torque ripple, vibration and noise. has an inherent advantage. By optimizing the structural design of the motor and improving the control algorithm, the motor can have superior low-frequency vibration and noise characteristics. ...

AI Technical Summary

Problems solved by technology

However, for other polyphase motors with winding forms, the strategy of carrier phase shifting is not yet clear

[0010] In summary, the existing analysis and calculation methods cannot fully meet the requirements of calculation accuracy, and a lot of preparatory work is required before the calculation, making it difficult to balance accuracy and speed

And the existing carrier phase shift strategy is mainly aimed at the special winding form where two sets of windings are arranged in the same slot. This carrier phase shift strategy is not the optimal carrier phase shift strategy for multi-phase motors.

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