This paper describes a new gyro-moment motor which utilizes two phase driving. Driving force is generated by two pairs of piezoelectric ceramic plates. They are attached to a cross-shaped vibrator plate which is made of stainless steel. As a direct torque transmission shaft is not necessary for a gyro-moment motor, it is free from a problem of mechanical friction of bearings. Accordingly, it is expected inherently to use as a high speed and low torque motor. But the former gyromoment motor dealt with in the reference [1] has not been able to change its rotating direction and to make starting the motor. We here resolved these defects by adopting two-phase driving structure, and obtained following results. The first advantage of this motor is to be able to change its rotating direction, in other words, to rotate in CW or CCW direction. The second is to achieve starting the motor without mechanical triggering.
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