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Intelligent Data Acquisition and Information Process Technologies
and Their Applications. Part II.




Vol. 19, Special Issue, February 2013, pp.1-6



Study on VSI Switching Frequency Optimization of PMSM Based Servo System

Shi-Xiong ZHANG

School of Mechanical & Electrical Engineering,

Henan University of Technology, No. 195, Zhongyuan Rd., Zhengzhou, 450007, P.R.China


E-mail: cehonzhang@gmail.com


Received: 4 December 2012   /Accepted: 15 January 2013   /Published: 19 February 2013

Digital Sensors and Sensor Sysstems


Abstract: A PMSM based servo system VSI switching frequency optimization strategy is proposed in this paper. In servo systems, high switching frequency is favored in order to improve the performance. However, switching frequency is limited by power electronic inherent characteristic. The ideal switching frequency is related to motor rotating speed in systems using SVPWM technique. Therefore, it is a better trade-off way to modify the switching frequency with rotating speed. The switching frequency regulation strategy in this paper is that, switching frequency is determined by power electronics under high speed condition while under low speed condition itís determined by the system performance. The constraint conditions are analyzed and the simulation platform and experiment platform are established. Simulation and experiment results show that the switching frequency optimization strategy proposed in this paper is feasible and effective.


Keywords: PMSM, SVPWM, VSI, Servo system, Switching frequency


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