二自由度超声波电机惯性驱动研究

Research on Inertial Drives of Two-degree-of-freedom Ultrasonic Motors

设计了采用单相电源驱动旋转和直线两种运动的新型单定子二自由度超声波电机,提出了一种近谐振点平稳惯性冲击的电机驱动方法。基于电机构造机理和驱动原理,建立了电机惯性驱动模型,定量分析了方波信号参数对电机性能的影响。算例分析表明,电机在近谐振点采用非对称方波激励,定子端面可输出符合惯性驱动要求的锯齿波。给出了最佳的方波驱动频率与占空比。该驱动方法简洁高效,完全消除了相位差对多自由度电机性能的影响。

A novel two-degree-of-freedom ultrasonic motor with a single stator was designed,whichrequired a single-phase power to drive rotary and linear motions. A SIDM was proposed which was close to theresonant frequencies. The inertial drive models of the motor was established based on motor constructionmechanism and driving principles. The influences of square wave signal parameters on motor performances wereanalyzed quantitatively. The simulation examples show that the stator surfaces may output suitable sawtoothwaves using the asymmetric square wave excitations near the resonant frequencies. The optimum drivefrequencies and duty cycles of the square waves are also given. The simple and efficient drive method mayeliminate the influences of the phase differences on multiple degree-of-freedom motor performances totally.