| 摘要 |
<p>An ultrasonic motor comprising a rotor (1), a multiplicity of drive pieces (2) disposed on the outer peripheral surface of the rotor (1) and each having two perpendicularly arranged ultrasonic vibrators (4), a pre-loading means for pressing the drive pieces (2) to the outer peripheral surface of the rotor (1) and ac power sources (10A, 10B) connected to respective one of two ultrasonic vibrators (4) and held in different phases.</p> |
