中文摘要：

对使用基于LCC超声波电机的驱动电路进行了初步探讨。文中首先描述超声波电机的单相等效电路；接着描述基于LCC的超声波电机驱动电路的基本原理，并由此得到驱动电路的数学模型。由于超声波电机运转时等效电路参数会发生变化，而参数的变化对电机动态性能（特别是品质因数）的影响较大。当使用基于LCC的驱动电路在其几何谐振频率附近工作时，可以有效克服由品质因数变化引起的输入电压幅值和相位的变化。最后仿真和实验证明此电路的有效性。

英文摘要：

A driving circuit based on LCC is presented in this paper for ultrasonic motor （USM） driving. Firstly a single phase equivalent circuit model of USM is introduced. Then the operation principle of the driving circuit based on LCC is described. And thus the mathematical model of the circuit based on LCC can be deduced. The dynamic parameters of USM will be changed greatly when the motor rotates. The parameters are greatly influenced by the variation in the quality of the resonant circuit. When the driving circuits based on LCC work about a geometric resonant frequency the amplitude and phase of the two phase output voltages of the circuit will not be influenced by the variation in quality of the resonant circuit. The two phase input voltages of the motor are also fixed. Finally, simu- lation and experiment results of the circuit are provided to demonstrate the effectiveness of the proposed circuit. From the above discussion and practical experiments availability of the driving circuit based on LCC can be verified. The driving circuit based on LCC is used for designing theory and performance improvement and control of ultrasonic motor, and also for increased performance of ultrasonic motor control.