Patent ID: 6100624
Filing Date: 2000-08-08
Classification: B60R,H02N

Abstract:
An ultrasonic motor, comprising:an annular stator having piezoelectric elements arranged in an annular shape,a rotor disposed to face the annular stator, anda pressing device for pressing the rotor to the annular stator, said pressing device including a threaded member situated near the rotor and a rotating member connected to the threaded member for rotating the same to adjust a relative position of the threaded member to the annular stator so that when the threaded member is rotated by the rotating member, the rotor is moved between a first position where the rotor is separated from the stator, and a second position where the rotor is strongly pressed to the stator, while a pressure of the rotor to the annular stator is adjusted between the first and second positions.