access icon free Sound-quality diagnosis method of permanent magnet synchronous motor for electric vehicles based on critical band analysis

© The Institution of Engineering and Technology
Received 22/01/2019, Accepted 01/07/2019, Revised 20/05/2019, Published 01/07/2019

As it has been widely and wrongly believed that noises at any frequency of permanent magnet synchronous motor (PMSM) are positively correlated with subjective annoyance, reducing sound pressure level or sound power level of PMSM is mostly regarded as the only optimisation goal of sound quality (SQ). This study presents a sensitive critical band (SCB) diagnostic method for SQ of PMSM for electric vehicles (EV). First, a new acquisition method of near-field noises without sound attenuation of PMSM was proposed and a neural network model for SQ evaluation was established to determine the specific operating condition with the worst SQ. Second, the band-pass filter of CB (BPFCB) and band-stop filter of CB (BSFCB) were designed to diagnose positive SCBs or negative SCBs in which noises were positively or negatively correlated with the subjective annoyance, respectively. Finally, the major excitation sources of abnormal noises in SCBs were diagnosed by using the analytical calculation. An 8-pole-48-slot PMSM was considered as a case study to testify to the effectiveness and practicability of the proposed method. It may provide a new route for the precise SQ optimisation of PMSM.

Inspec keywords: band-stop filters; synchronous motors; band-pass filters; power engineering computing; electric vehicles; permanent magnet motors; neural nets; optimisation

Other keywords: sound power level reduction; BSFCB; EV; sound-quality diagnosis method; BPFCB; sound pressure level reduction; electric vehicles; PMSM; band-pass filter; near-field noise acquisition method; SQ optimisation evaluation; band-stop filter; critical band analysis; sound attenuation; sensitive critical band diagnostic method; positive SCB diagnostic method; neural network model; 8-pole-48-slot PMSM; sound quality; negative SCB diagnostic method; permanent magnet synchronous motor

Subjects: Transportation; Optimisation techniques; Power engineering computing; Optimisation techniques; Neural computing techniques; Synchronous machines

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