N. Takesue, T. Ohara, R. Ishibashi, S. Toyama, M. Hoshina, Y. Hirai, N. Fukaya, J. Arata, H. Fujimoto
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Position control methods of spherical ultrasonic motor
In this paper, we investigate the position control of spherical ultrasonic motor (SUSM). The generated torque of SUSM is influenced by the phase difference and the driving frequency of applied AC voltages. Therefore, the control strategy is classified into three types: (a) variable phase and fixed frequency, (b) fixed phase and variable frequency, and (c) variable phase and frequency. We formulate the position control rules for SUSM based on the above three types of control variables, and investigate the performances experimentally.