关键词: 超声波电机, 推挽逆变, 解耦控制, 线性调压, 驱动器

Abstract: An innovative amplitude-frequency decoupling drive strategy is proposed to address the control challenges arising from the strong coupling between drive frequency and voltage amplitude in ultrasonic motor ( USM) drive systems. This method restructures the power flow control architecture at the hardware level. The pre-stage integrates a voltage closed-loop feedback mechanism to independently and linearly regulate the direct current bus voltage through pulse width modulation, while the post-stage utilizes a push-pull inverter equipped with a resonant boost circuit for frequency tracking and high-voltage output . A system simulation model was established using MATLAB / Simulink to leverage its capabilities for dynamic simulation and analysis. An experimental platform was then constructed for validation. A platform was constructed for the purpose of
validation. Experimental results confirm that the driver accomplishes precise linear voltage control over an extensive range of 260 ~ 560 V,achieving a regulation precision of 0. 3 V. The motor speed exhibits a significant linear correlation with the drive voltage across varying frequency conditions. The research validates that the introduced methodology successfully resolves the challenges associated with coupled control in ultrasonic motor drives. Featuring a wide voltage regulation range,high linearity, and strong robustness,it provides a novel technical solution for the high-performance servo control of ultrasonic motors.

Key words: ultrasonic motor, push-pull inverter, decoupling control, linear voltage regulation, driver