| 摘要 |
PURPOSE:To lower the quality factor Q by using a nonlinear spring mechanism in structure in which a stator and a rotor for an ultrasonic motor are contact- bonded. CONSTITUTION:An ultrasonic motor employing a nonlinear resonance system is constituted of a stator consisting of piezoelectric bodies 3, 3', etc. and a rotor 7 with a shaft 11, etc. The stator is organized as an ultrasonic elliptical vibrator in which a cap bolt 6 is penetrated to the piezoelectric body 3', a terminal board 4', the piezoelectric body 3, a terminal board 4 and a drum section 2 from the washer 5 side, inserted into a tapped hole for a torsional connector 1, and unified. The rotor 7 takes a discoid shape, and is contact- bonded with the end surface of a beam 1' in the connector 1. The rotor 7 is contact-bonded with the stator by using a nonlinear spring 10 penetrated to a cap bolt 8 on the inside of the rotor 7 at that time. Accordingly, performance characteristics in which various characteristics such as the number of revolution, torque, etc., are kept approximately constant extending over a wide frequency range can be acquired without largely lowering the quality factor Q. |
