Interior permanent magnet synchronous motor minimum current harmonics torque ripple suppression strategy based on magnetic co‐energy model

Abstract

Permanent magnet synchronous motors are widely used in electric vehicles. The permanent magnet synchronous motor torque ripple suppression is a research hotspot at present. This study adopts the torque ripple equation based on magnetic co‐energy. Two novel minimum current harmonics torque ripple suppression strategies based on the magnetic co‐energy are proposed. Both methods are suitable for whole current map calculation. One is based on dq‐axis model, which makes the dq‐axis current harmonics fluctuate along gradient direction of the torque equation to dq‐axis currents. The other one is based on the newly proposed torque–current coupling model. The minimum current harmonics obtained by the two methods are basically the same. At last, finite element method and test bench experiment are used to verify the two methods. Both of them can effectively suppress torque ripple.

Effect of time‐harmonic current on the harmonic leakage inductance of fractional slot concentrated winding permanent magnet synchronous motor

“…As for the influence of motor performance, Zhong et al [17] obtained the conclusion that the second harmonic current is the origin of resonance of switched reluctance motor by analysis. In [18], Yi et al explored the influence mechanism of time‐harmonic current and torque ripple of PMSM, and proposed an effective strategy to suppress torque ripple. However, to the author's knowledge, there are few literatures to study the influence of time‐harmonic current on the harmonic leakage inductance of the motor.…”