[1] [1] ZHAO CH SH．Ultrasonic Motors Technologies and Applications [M]．Beijing：Science Press，Berlin Heidelberg：Springer-Verlag，2010．

[2] [2] KUROSAWA M K，KODAIRA O，TSUCHITOI Y，et al.．Transducer for high speed and large thrust ultrasonic linear motor using two sand wich-type vibrators[J]．IEEE Transactions on Ultrasonics, Ferroelectrics，and Frequency Control，1998，45(5)：1188-1195．

[3] [3] SHI Y L，LI Y B，ZHAO CH SH．Operating principle analysis of a V-shape linear ultrasonic motor[J]．Piezoelectrics and Acoustooptics，2008，30(6)：772-775(in Chinese)．

[4] [4] KAZUMASA A，RYOUICHI F，TAKESHI F，et al.．High speed，high resolution ultrasonic linear motor using V-shape two bolt-clamped Langevin-type transducers[J]．Acoustical Science and Technology，2009，30(3)：180-186．

[5] [5] LI Y B，SHI Y L，ZHAO CH SH．Design and experiment of butterfly linear ultrasonic motor with two driving tips[J]．Opt. Precision Eng.，2008，16(12)：2327-2333．

[6] [6] JIN J M．Research on novel ultrasonic morors theory and applications[D]．Nanjing：NUAA，2007.(in Chinese)

[7] [7] YANG M，ROBERT C R，MARTIN C L，et al.．Performance improvement of rectangular-plate linear ultrasonic motors using dual-frequency drive[C]．IEEE transactions on ultrasonics, ferroelectrics, and frequency control，Montreal，Canada，2004:1600-1606．

[8] [8] JIN J M，ZHAO CH SH．Linear ultrasonic motor using quadrate plate transducer[J]．Frontiers of Mechanical Engineering in China，2009，4(1)：88-91．

[9] [9] WAIAI T，KUROSAWA M K，HIGUCHI T．Transducer for an ultrasonic linear motor with flexible driving part[J]．IEEE Ultrasonic Symposium，1998(1)：683-686．

[10] [10] LI T，ZHANG T M，LIU X J．Synchronized driving of multi-stator ultrasonic motor[J]．Journal of Vibration, Measurement & Diagnosis，2008，28(4)：343-346.(in Chinese)

[11] [11] HEMSEL T， WALLASCHEK J．A novel approach for high power ultrasonics motors[C]．Proceedings of IEEE Ultrasonics, Ferroelectrics, and Frequency Control Conference，2004:1161-1164．

[12] [12] MRACEK M，HEMSEL T．Synergetic driving concepts for bundled miniature ultrasonic linear motors[J]．Ultrasonics，2006，44:597-602．

[13] [13] MRACEK M，HEMSEL T， SATTEL T，et al.．Driving concepts for bundled ultrasonic linear motors[J]．J Electroceram，2008(20):153-158．