[1] [1] WANG Guo-min. Review of Drive Style for Astronomical Optical Telescope [J]. Progress in Astronomy，2007，25(4)：364-374.

[2] [2] Erm T M，Seppey A. A cost effective direct drive option for the Thirty Meter Telescope [J]. Proceedings of SPIE(S0277-786X)，2006，6273(1)：351-358.

[3] [3] Leonardi F，Venturini M，Vismara A. PM Motors for Direct Driving Optical Telescope [J]. IEEE Industry Applications(S0093-9994)，1996，38(5)：10-16.

[4] [4] Gutierrz P. Standardization of direct drives servos in telescope applications [J]. Proceedings of SPIE (S0277-786X)，2003，4837：325-335.

[5] [5] Imoue M，Sato K. An approach to a suitable stator length for minimizing the detent force of permanent magnet linear synchronous motors [J]. IEEE Transactions on Magnetic(S0018-9464)，2000，36(4)：1890-1893.

[6] [6] Lim K C，Woo J K，Kang G H，et al. Detent force minimization techniques in permanent magnet liner synchronous motors [J].IEEE Transactions on Magnetic(S0018-9464)，2002，38(2)：1157-1160.

[7] [7] Zhu Z O，Xia Z P，Howe D，et al. Reductions of cogging force in slot less linear permanent magnet motors [J]. Proceedings of IEEE(S0143-7038)，1997，144(4)：277-282.

[8] [8] GUO Hong，JIA Zheng-chun，ZHAN Qiong-hua，et al. Analysis of the force of permanent magnet synchronous linear motor[J].Electric Machines and Control，2004，8(1)：1-4.