定性介绍了压电陶瓷技术研究所研制的一种压电超声马达的工作原理．通过定量建立和解压电定子的振动方程，得出定子驱动端轨迹为椭圆这一推动转子转动的关键，并对转子材料提出一些要求 The working principle of a piezoelectric ultrasonic motor developed by the Institute of Piezoelectric Technology is qualitatively introduced. By quantitatively establishing and un-deconstructing the vibration equation of the stator, it is concluded that the trajectory of the stator end is elliptical, which is the key to the rotation of the rotor. Some requirements are put forward on the rotor material