Switched Reluctance Motor Control Using Multi-rate Filter Pulse Width Modulation

• Main Authors: Lee, Yeh-Wen, 李業文
• Other Authors: Hu, Jwu-Sheng
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/35429851374353869400

碩士 === 國立交通大學 === 電控工程研究所 === 101 === This thesis proposed a novel scheme for current control of switched reluctance motor by using multi-rate filter pulse width modulation to improve the efficiency of traditional pulse-width modulation. We utilized a filter to compensate the error current for reducing the error current and generating an asymmetrical pulse width modulation, which is the combined by two PWM signals produced by multi-rate system. This method can reduce the switching loss of power transistor and decrease power consumption. Thus, the temperature of the power switching element will be reduced and provide a long life span. In addition, we also developed a high efficiency angle control strategy, the purpose is to lower extra copper loss, simultaneously able to achieve constant torque controlled conditions. In order to verify the feasibility of this method are used as the basis of theoretical operations, through systematic analysis of verification under certain conditions, this method can play a maximum efficiency. The implementation of our system is using a low-cost 32-bits controller and a three-phase asymmetric half bridge inverter. In our experiment, we compared the various speeds in the same load with different current control strategies such as PWM, APWM, FPWM and MRFPWM. The results showed that the efficiency of MRFPWM is better than other control strategies, it also lowered the number of switching doubled for protecting the surface of power transistor and increased the efficient of power transistor.