The ultrasonic motor developed in the mid-1980s is a new driver driven by the vibration of ultrasonic frequency based on functional ceramics. Ultrasonic motor is a typical mechatronics product, which is composed of motor body and control driving circuit.

     Compared with the traditional motor, it has the following characteristics and advantages: low speed and high torque output; High power density; Good start stop control; Direct drive can be realized; Accurate positioning can be realized; Easy to make linear motor; Low noise; Anti interference, etc.

    Two notable features of ultrasonic motors are:

1. Low speed high torque output;

2. The holding torque is large, and the macro performance is good start and stop control.

     Due to the above characteristics, the system connected with the ultrasonic motor does not need gear reduction mechanism and braking mechanism, which simplifies the structure of the application system. Ultrasonic motor has attractive application prospects and has become a research hotspot. Specifically, there are the following aspects: micro intelligent robots, optical instruments, aerospace, medical machines, detection systems, precision machining, etc.

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