摘  要：由于超声电机需要幅值较高的驱动电压，因此其驱动电路需要变压器升压。电机为非线性容性负载，需要进行阻抗匹配，并保持电压和相移恒定。该文利用推挽电路作为驱动器拓扑，分析了驱动器在感性负载时的开关管损耗较容性负载时小，提高了驱动器效率和可靠性。并对串联电感匹配电路进行了改进，给出了LLCC谐振网络，并进行了Saber仿真分析，最后采用TRUM-60型超声电机进行了实验，结果证明了该方法的有效性。
关键词：超声电机；驱动电路；推挽；LLCC；

Abstract: High driven voltage is required for ultrasonic motor, so the driving circuit needs transformer to boost voltage. Since the USM is a nonlinear capacitive load, a matching circuit is needed to keep the output voltage and the phase shift constant. For the switching circuit with push-pull topology, the switching loss is less under inductive load rather than capacitive load, which will increase its efficiency and reliability. The matching circuit with series inductor was improved and a novel LLCC resonant network was proposed,which was simulated in Saber. This novel driver is applied to the TRUM-60 type ultrasonic motor, and the experimental results are presented to verify the effectiveness of the proposed circuit.
Key words: ultrasonic motor; driver circuit; push-pull; LLCC