Comparative Analysis of Vibration and Noise in IPMSM Considering the Effect of MTPA Control Algorithms for Electric Vehicles

For many servosystems in electric vehicles (EVs), high-performance controls of permanent magnet synchronous motor (PMSM) drives are widely used due to their high efficiency and low vibration and noise. In order to ensure the high efficiency of the servosystems, some online and offline maximum torque per ampere (MTPA) control strategies are proposed; meanwhile, the vibration and noise of interior PMSMs (IPMSMs) in these servosystems for EVs must be smooth and soft. In this article, the vibration and noise of the IPMSM based on MTPA control algorithms are evaluated and compared. First, the influence of the voltage inverter on the noise of IPMSM is presented in detail and the relationship between the harmonic frequencies of the air gap magnetic force and the vibration frequencies of the IPMSM is investigated. Then, combined with this relationship, the effect principle of the control strategies on the magnetic vibration of the IPMSMs is defined. Based on this definition, the operation process and noise mechanism of different control methods are discussed. Finally, the performance of the vibration and noise under classical field-oriented control, offline MTPA control, and online MTPA control is concluded. With the comprehensive analysis and overview provided in this article, it is significant to guide the selection of a high-performance control method for servosystems in EVs.