Development of linear motor and its optimization method of detent force

ZHANG Dazhong1,2, LIAO Youyong1*, LI Guoping2
(1.Ningbo Institute of Materials Technology & Engineering， Chinese Academy of Sciences, Ningbo
315211, China; 2. Department of Mechanical Engineering， Ningbo University, Ningbo 315211, China)

Abstract: Aiming at application defects of traditional indirect driving system using in automation equipment, the concept of direct driving was proposed, the linear motor was used as a power source to promote the platform. Based on a comparison of direct driving and the traditional indirect driving performance, the application tendency of linear motor was discussed using in automatic control fields of larger stroke, high speed and high precision, and then the linear motor of domestic and foreign research status were introduced from the driving principle, the driving force and the positioning precision. In view of the effecting of detent force of linear motor on its driving performance, the principle and research methods using by some related scholars were summarized, which were about the end effect weakened and cogging force reduced, and finally the optimization methods were summed up for the linear motor′s detent force from the motor body design and the motor control technology. The results indicate that owning to the perfect operating performance of linear motor, it will replace the traditional rotary motor in the industry market, at the same time, the linear motor must solve the problem of manufacturing process, the motor thermal effects, and the motor driver design to be promoted in engineering application deeply.
Key words: linears motor; development; detent force; motor design; control