Title: Evaluation and comparison of sideband harmonics and acoustic responses with continuous and discontinuous PWM strategies in permanent magnet synchronous motor for electric vehicles

Authors: Zizhen Qiu; Yong Chen; Xu Liu; Liming Zhang; Haiquan Cheng

Addresses: Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles, Hebei University of Technology, China ' Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles, Hebei University of Technology, China ' State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, China ' Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles, Hebei University of Technology, China ' Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles, Hebei University of Technology, China

Abstract: High-frequency vibro-acoustics, introduced by voltage source inverter (VSI) and control strategies, are the critical features affecting the noise, vibration and harshness (NVH) performances of electric vehicles (EVs). In this paper, a comprehensive evaluation and comparison into sideband current harmonics and high-frequency vibro-acoustic responses has been studied with different control strategies in the study case of permanent magnet synchronous motor (PMSM). At first, the principles and implementation of continuous and discontinuous pulse-width modulations (PWM) techniques are explored. Then, the features of the sideband current harmonic and radial electromagnetic forces are deduced with analytical derivations, in which the frequency characteristics are also presented. Furthermore, all PWM schemes have been improved by a standard periodic dithering modulation with square signal-based to reduce the sideband harmonics. The experimental results show that the sideband current harmonics and vibro-acoustics are generally clustered around the carrier frequency and have a particular orders and spectral distributions. The overall level of the obtained DPWM schemes present a slight deterioration compared to the SVPWM ones. With the periodisation of the carrier frequency, the sideband components show a significant suppression, which is above 15 dBA reduced in the acoustic noise responses.

Keywords: permanent magnet synchronous motor; PMSM; pulse-width modulation; PWM; sideband harmonics; vibro-acoustic responses; periodic dithering modulation.

DOI: 10.1504/IJHM.2022.123132

International Journal of Hydromechatronics, 2022 Vol.5 No.2, pp.109 - 123

Received: 03 Sep 2021
Accepted: 14 Sep 2021

Published online: 30 May 2022 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article