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Title
Japanese: 
English:A newly developed ripple-free precision toroidal type motor 
Author
Japanese: 吉岡 勇人, 栗崎 悠吾, 澤野 宏, 新野 秀憲.  
English: Hayato YOSHIOKA, Yugo KURISAKI, Hiroshi SAWANO, Hidenori SHINNO.  
Language English 
Journal/Book name
Japanese: 
English:CIRP Annals - Manufacturing Technology 
Volume, Number, Page Vol. 61    No. 1    pp. 363-366
Published date May 31, 2012 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1016/j.cirp.2012.03.140
Abstract Demands for ripple-free spindle rotation have recently increased in a variety of industrial sectors, i.e., electron beam mastering systems, semiconductor production instruments, etc. However, typical electric motors usually have torque ripple caused by the cogging force and uneven magnetic flux density, which deteriorates the spindle performance. This paper presents a newly developed torque ripple-free precision toroidal type motor. The magnet yoke of the developed motor is designed so as to provide an idea sinusoidal magnetic flux distribution which can generate smooth torque. Evaluation results confirmed that the developed motor achieves superior performance.

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