| 摘要 |
An ultrasonic motor includes an annular stator, a rotor, a rectangular parallelepiped multilayer piezoelectric transducer, a support shaft, three transducers with drivers, a holder for holding the transducers with an elastic plate therebetween, and an urging leaf spring for urging the holder. The holder having the transducers is inserted into transducer attaching holes arranged at positions where the circumference of the stator is divided into three parts in a state of the holder urged by the urging leaf spring from the back of the holder. The drivers of the transducer are abutted by an urging force of the urging leaf spring to a hardwearing ring fixed to the outer circumference of the rotor on the side of the internal circumference of the stator. When the transducer is driven so as to excite an elliptical movement produced in the drivers by combining a bending standing-wave vibration with a longitudinal vibration, the rotors are rotated relatively to the stator. This ultrasonic motor can be used for a drive source of an object of rotation with small frictional loss and improved conversion efficiency.
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