直驱转台设计力矩电机优化设计和控制原文.docVIP

J. Electromagnetic Analysis Applications, 2009, 1: 220-228 doi:10.4236/jemaa.2009.14033PublishedOnlineDecember2009(http://www.SciRP.org/journal/jemaa) Optimal Design and Control of a Torque Motor for Yee-Pien YANG, Shih-Chin YANG, Jieng-Jang LIU Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan, China. Email: {ypyang@, jjliu}@.tw Received July 23rd, 2009; revised August 19th, 2009; accepted August 26th, 2009. ABSTRACT This paper presents a systematic approach of optimal design and control of a surface-mount, permanent-magnet synchronous torque motor for the next-generation machine tools. A step-by-step procedure of optimization integrates multiple performance objectives and constraints to help the designer make the best decision on the final motor geometry from both design and control perspectives. In the perspective of design, a torque motor with concentrated windings and similar numbers of slots and poles may achieve the desired performance after optimization for multiple objectives, leading to a sinusoidal flux density for a nearly ripple-free torque distribution. From the control perspective, an optimal current waveform with an ideal shift angle is determined for each phase by aligning the current excitation with the back electromotive force. Both design and control of the surface-mount, permanent magnet machine are verified by the finite element method, and a prototype is fabricated for performance validation. Keywords: Multi-Objective Optimization, Torque Motor, Machine Tool, Optimal Current Waveform 1. Introduction In many industrial applications, torque motors attract much attention by their appealing features of high torque density, high efficiency and low ripples. A particular type of permanent magnet (PM) motor uses advanced electronic commutation to replace traditional mechanical commutation. This simple structure makes it easier to fabricate at low cost in the direct or indirect-drive arrangement. The