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김동옥(D.O.Kim),정국영(G.Y.Jung),오금곤(G.K.Oh),김영동(Y.D. Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
To control the position, velocity and torque of the ultrasonic motor, a great variety of method are proposed such as the amplitude, phase difference, frequency and so on In the case of phase difference method, it has some advantages, it can control the direction and velocity of rotation only adjusting the phase difference and It has wide control-band During the USM driving on adjusting phase difference, Its characteristic was transformed by the change of resonance-frequency of stator, which means that the resonance frequency is different according to the phase difference Consequently, we need to set up the most suitable driving frequency according to each phase difference