8ZHU Z Q, XIA Z P, HOWE D, el al. Reduction of cog- ging force in slotless linear permanent magnet motors [ J ]. Eelectric Power Applications, 1997,144 ( 4 ) :277-282.
9INOUE M, SATO K. An approach to a suitable stator length for minimizing the detent force of permanent magnet linear synchronous motors[ J]. Magnetics IEEE Transac- tions on,2000,36 (4) : 1890-1893.
10CRUISE R J, LANDY C. Reduction of cogging forces in linear synchronous motors [ J ]. IEEE Africon, 1999,99 (6) :623-626.