A novel suppression method of 6th-order torque ripple of permanent magnet synchronous motor without torque meter

Abstract

The authors have proposed a new suppression method of the 6th-order torque ripple of permanent magnet synchronous motors (PMSMs). The proposed method can estimate the harmonic components in the flux-linkage which is the cause of 6th-order torque ripple. And, the proposed method does not use a torque meter, and estimate the harmonic components by mainly using current sensors of the inverter. By simulation using two RT models, it was confirmed that the 6th-order torque ripple could be suppressed approximately 48%.Index Terms-Permanent magnet synchronous motor, 6th-order torque ripple, periodic disturbance observer, without Torque Meter.

Compensation for Inverter Nonlinearity in Permanent Magnet Synchronous Motor Drive and Effect on Torsional Vibration of Electric Vehicle Driveline

“…To extract the amplitude of harmonic components online, this paper uses a transform similar to Fourier transform which is called approximate Fourier transform. The approximate Fourier transform can extract the amplitude of harmonic components of a specific frequency online without intensive calculation [26].…”

“…For suppressing vibration, methods to extract frequency and amplitude of interest are needed. The approximate Fourier transform is a method to extract the amplitude of the sine-cosine components of specific frequency [26]. Reference [27] summarizes five methods for decoupling hybrid faults in gear transmission systems, which are Wavelet, Empirical Mode Decomposition, Order Tracking, Sparse Decomposition, and Independent Component Analysis-based decoupling approaches.…”