施加不同的预压力在低、高真空环境下对超声电机的转速、转矩及温升进行测量并与常态下相比较。
By applying different pre-pressure, the speed, torque and temperature of the ultrasonic motor in low and high vacuum have been tested and compared with the normal condition.
经过优化设计的电机，具有温升低、噪声小、振动小、运转平稳、效率高、起动转矩大等特点。
The motors has such features as low temperature rising, low noise, low vibration, stable speed, high efficiency and high starting torque etc.
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