Development of Four-phase Switched Reluctance Motor Drives with Low Torque Ripple

• Main Authors: Chong-jia Chen, 陳重嘉
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/28644249477940991969

碩士 === 國立臺灣科技大學 === 電機工程系 === 102 === 　　This thesis presents the design of a four-phase switched reluctance motor drive system with special emphasis on the reduction of torque ripple. The switched reluctance motor consists of an 8-pole stator and a 6-pole rotor. Finite element analysis software, Ansoft Maxwell 2D, is used to analyze the magnetic circuit and find the suitable wiring under simultaneous two-phase excitation. Based on the analysis, two-phase series type dc-dc power converter is proposed to support the concurrent winding excitation. As to the motor drive system, Hall effect sensors are used to detect the required rotor positions and the rotational speed of the motor with 12-pole ring magnet. Finally, closed-loop speed control strategy is realized in accordance with the feedback signals. 　　In this thesis, a 16-bit digital signal processor, dsPIC30F4011, is adopted as the control core. The system is controlled by software for cost reduction and reliability enhancement. The input dc-bus voltage of the system is 72V. The rotational speed of the motor ranges from 500 to 1000 rpm. The corresponding torque is 0.50 N-m. At the speed of 1000rpm, the torque ripple component is 28%, which significantly improves the vibration as compared to switched reluctance motor operating under single-phase excitation. Analysis and experiments verify the proposed two-phase excitation control with torque ripple reduction.