Electromagnetic noise analysis and optimization for permanent magnet synchronous motor used on electric vehicles

Abstract

Purpose Electromagnetic noise of permanent magnet synchronous motor (PMSM) seriously affects the sound quality of electric vehicles (EVs). This paper aims to present a comprehensive process for the electromagnetic noise analysis and optimization of a water-cooled PMSM. Design/methodology/approach First, the noises of an eight-pole 48-slot PMSM in at speeds up to 10,000 rpm are measured. Furthermore, an electromagnetic-structural-acoustic model of the PMSM is established for multi-field coupling simulations of electromagnetic noises. Finally, the electromagnetic noise of the PMSM is optimized by using the multi-objective genetic algorithm, where a multi-objective function related to the slot width of PMSM stator is defined for radial electromagnetic force (REF) optimization. Findings The experimental results show that main electromagnetic noises are the 8n-order (n = 1, 2, 3, …) and 12-order noises. The simulated results show that the REFs are mainly generated by the 8n-order (n = 1, 2, 3, 4, 5, 6) vibrations, especially those of the 8th, 16th, 24th and 32th orders. The 12-order noise is a mechanical noise, which might be caused by the bearings and other structures of the PMSM. Comparing the simulated results before and after optimization, both the REFs and electromagnetic noises are effectively reduced, which suggests that an appropriate design of stator slot is important for reducing electromagnetic noise of the PMSM. Originality/value In view of applications, the methods proposed in this paper can be applied to other types of PMSM for generation mechanism analysis of electromagnetic noise, optimal design of PMSM and thereby noise improvement of EVs.

Study on Electromagnetic Performance of Permanent Magnet Rotor and Dual Stator Starter Generator for Electric Vehicle Range Extender

“…T he widespread use of automobiles has exacerbated the depletion of petroleum resources. In order to solve the problems of energy shortage and environmental pollution, new energy vehicles have become the main development direction of today's automobile industry [1][2][3][4]. At present, the starter generators used for electric vehicles mainly include electroexcitation starter generator and permanent magnet starter generator.…”

Simulation, Verification and Optimization Design of Electromagnetic Vibration and Noise of Permanent Magnet Synchronous Motor for Vehicle

“…The traditional electromagnetic noise simulation mainly focuses on radial force and ignores the electromagnetic force component, which affects the simulation accuracy. In the literature [7], the radial electromagnetic force alone and the combined radial, tangential and axial electromagnetic force are analyzed. The results show that the tangential electromagnetic force has a certain degree of influence on the electromagnetic noise, and the motor stator model with radial, tangential and axial electromagnetic force is more realistic and reliable.…”

“…In [14], in order to weaken the electromagnetic force harmonics caused by tooth harmonics and thus effectively suppress the electromagnetic noise of the motor, the analytical equation of radial electromagnetic force waves of the rotor's segmented diagonal poles is derived, the suppression mechanism of segmented diagonal poles on electromagnetic noise of permanent magnet synchronous motor is analyzed, and the relationship between the number of different diagonal pole segments and the weakened tooth harmonic order is discussed. For the V-rotor permanent magnet motor for 30 kW electric vehicle drive, an optimization scheme using a new magnetic isolation bridge is proposed in the literature [15] and simulated under several characteristics, and then the feasibility and validity are verified through prototype experiments In [16], the authors used an experimental method to analyze the effect of the friction damping coefficient between the water jacket and the casing on the radiated noise of the motor, and the results showed that changing the friction coefficient between the water jacket and the casing can effectively improve the motor noise problem. In [17], the authors proposed a method for fractional-slot permanent magnet synchronous motors to inject a certain compensation current into the stator winding to cancel the radial force harmonics with the lowest modulus and thus suppress the electromagnetic vibration of fractional-slot motors.…”

A control strategy of a permanent magnet synchronous motor for an electric vehicle

“…Because the calculation of the SVPWM method before optimization needs to repeatedly transform and adjust the orthogonal coordinate system, and involves complex calculation of the trigonometric function, after the transformation of the orthogonal coordinate system, although the coordinate adjustment problem is solved, the calculation of the trigonometric function is still very complex. The SVPWM method without optimization is lengthy and has a large amount of calculation (Wang et al, 2019;. In this paper, the SVPWM calculation method in the PMSM inverter is optimized, the voltage space vector in each sector is synthesized.…”