An Analytical Method of PWM Duty Cycle for Switched Reluctance Motors Based on Current Chopping Control
Tian Dexiang1,2, Qu Bingni1,2, Song Jiancheng1,2, Zhao Yong1,2
1. National & Provincial Joint Engineering Laboratory of Mining Intelligent Electrical Apparatus Technology Taiyuan University of Technology Taiyuan 030024 China; 2. College of Electrical and Power Engineering Taiyuan University of Technology Taiyuan 030024 China
Abstract In this paper, an analytical calculation method for PWM duty cycle based on current chopping control is proposed. The purpose of this method is to solve the problem of large current ripple under current chopping control of switched reluctance motor drives. Incorporating the principle of current chopping control and the actual control process, the main reason for the large current ripple was analyzed. According to the electromagnetic relationship of the switched reluctance motor, the analytical methods of PWM duty cycle for small inductor region and inductor rise region were proposed respectively. The winding current increased monotonously and finally reached the reference current in the small inductance region, and then remained substantially constant in the inductor rise region by the proposed method. At the same time, an experimental method for determining the inductance value in the small inductor region and the inductor slope of the inductor in rise region was proposed. According to the measurement results, a polynomial fitted curve was performed on the relationship between the inductance slope of the inductor rise region and the winding current. The curve is used to the online calculating of PWM duty cycle. Finally, compared with the traditional current chopping control method, the experimental results show that the proposed method effectively reduces the current ripple and improves the control performance of the motor.
Tian Dexiang,Qu Bingni,Song Jiancheng等. An Analytical Method of PWM Duty Cycle for Switched Reluctance Motors Based on Current Chopping Control[J]. Transactions of China Electrotechnical Society, 2019, 34(21): 4449-4457.
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2019, Vol. 34 
