Single-excitation rotary ultrasonic motor

Abstract

The invention discloses a single-excitation rotary ultrasonic motor. A rotor comprises a rotating disk and a frictional layer arranged on the surface of the rotating disk; a stator comprises an ultrasonic vibration transducer, an elliptical vibration mode converter and a friction drive block which is arranged at the front end of the elliptical vibration mode converter; the ultrasonic vibration transducer comprises a bolt and a rear cover plate, piezoelectric ceramic sheets, an electrode plate and a front cover plate which are sleeved on the bolt sequentially; the front end plate is in threaded connection with the bolt; the elliptical vibration mode converter is arranged at the front end of the front cover plate, and is cylindrical integrally; three staggered rectangular notches are formed on the upper side and the lower side of the elliptical vibration mode converter; and the elliptical vibration mode converter can convert longitudinal ultrasonic vibration generated by the ultrasonic vibration transducer to elliptical vibration of the tail end of the elliptical vibration mode converter and the friction drive block, and can drive the rotor to make continuous rotation motion.

Description

technical field [0001] The invention relates to the field of ultrasonic motors utilizing the inverse piezoelectric effect of piezoelectric ceramics, in particular to a single-excitation rotary ultrasonic motor. Background technique [0002] The rotary ultrasonic motor is a new type of micro-motor developed and applied rapidly in the 1980s. It is an electromechanical coupling device that uses the inverse piezoelectric effect of piezoelectric materials to convert electrical energy to mechanical energy. Through the friction between the stator and the rotor, the The micro-vibration of the elastomer is converted into the macro-rotational motion of the rotor, which directly drives the load. Because of its small size, light weight, low speed and high torque, low noise, fast response, high positioning accuracy, no electromagnetic interference and strong environmental adaptability, it has been increasingly widely used in medical, aerospace, robotics, MEMS and other technical fields. ...

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Problems solved by technology

Although the motor has the advantages of large output torque, the six piezoelectric ceramic sheets of the motor must be staggered and installed by 60 degrees according to the polarization partition, and its structure is complicated. Spiral motion (rotational force) can easily cause misalignment between piezoelectric ceramic sheets, and it is difficult to ensure the technical requirement of 60 degrees of misalignment between adjacent piezoelectric ceramic sheets; in addition, there is no positioning device between the stator and rotor of the motor, which The accuracy of the contact position between the stator and the rotor is affected, which in turn affects the stability of the torque and speed of the motor; therefore, this type of rotating ultrasonic motor has a complex structure and requires high contact position accuracy between the stator and the rotor. Difficult manufacturing and installation, poor stability of motor torque and speed, etc.

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