<title>Operational characteristics of a same-phase drive-type ultrasonic motor</title>

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We have investigated in detail the ultrasonic motors using two degeneration modes driven by the same-phase input signal, namely, one channel, and some constructions and characteristics of the prototype motors using disk vibrator based on this principle have been reported. However, operational characteristics of the motor were influenced considerably in proportion to the pressing force between the stator and the rotor. In this paper, some considerations on the effect are investigated experimentally. From measurements of the vibration mode in the operational state, it was found that the change of rotational direction of the motor is caused by the shift of the vibration axis of the mode synthesized from two degeneration modes. Revolution characteristics for both rotational directions of the improved motor are shown. The maximum torque and efficiency were about 4.5kgf-cm and 30 percent, respectively.

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