System and method for suppressing torque ripple of permanent magnet synchronous motor

Abstract

The invention discloses a permanent magnet synchronous motor torque ripple suppression system and a permanent magnet synchronous motor torque ripple suppression method. The permanent magnet synchronous motor torque ripple suppression system comprises a torque acquisition unit, a current component calculation unit, an angle acquisition unit, a ripple angle construction unit, a rotation transformation unit, a first low-pass filter, a second low-pass filter, a PI controller, an inverse rotation transformation unit and a feedforward unit, wherein the torque acquisition unit is used for acquiring torque of a permanent magnet synchronous motor; the current component calculation unit is used for acquiring a current component of a q axis; the angle acquisition unit acquires an angle of a flux linkage of a rotor; the ripple angle construction unit constructs a ripple angle; the PI controller outputs a first intermediate component; the PI controller further outputs a second intermediate component; the inverse rotation transformation unit is configured to obtain a feedforward amount; and the feedforward unit is configured to invert the feedforward amount and then feed the inverted feedforwardamount forward to output of a current loop. The permanent magnet synchronous motor torque ripple suppression system and the permanent magnet synchronous motor torque ripple suppression method directly target at the torque ripples, automatically adjust the injected voltage feedforward amount by means of the closed loop, and suppress the torque ripples more thoroughly.

Description

technical field [0001] The invention belongs to the technical field of torque ripple suppression of motors, and in particular relates to a torque ripple suppression system and method of a permanent magnet synchronous motor. Background technique [0002] The existence of air-gap flux harmonics in permanent magnet synchronous motors is one of the main reasons for the torque ripple of permanent magnet synchronous motors. Although the torque ripple can be reduced by oblique poles in the motor body, improving the shape of the magnetic poles, and optimizing the width of the cogging, But it cannot be eliminated. In addition, the introduction of uncertain factors such as deviations in the manufacturing process will also change the amplitude of torque ripple. With the development of offshore wind power, the power of permanent magnet wind turbines is developing towards a larger level. Therefore, the amplitude of the torque ripple will also be larger, and the torque ripple will cause...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a system and method for suppressing torque ripple of a permanent magnet synchronous motor in order to overcome the defects of high cost and incomplete suppression of torque ripple in the prior art

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