超声波电机的频率自动跟踪

Frequency Tracking of Ultrasonic Motor

随着超声波电机运行时间的增加,其谐振频率会下降,进而使电机速度降低。为保持电机速度的稳定性,该文提出了一种具有新颖的频率自动跟踪功能的超声波电机驱动源。它使用窗口比较器、可逆计数器、D/A转换器和压控振荡器实现频率跟踪功能。结合理论分析和LC谐振曲线,阐明了跟踪器的工作原理。实验结果表明这个方案是可行的。

As the increase of running time,the resonant frequency of ultrasonic motor will decrease,which then leads to the decrease of speed.To keep the stability of motor′s speed,a ultrasonic motor driver with novel automatic frequency tracking is proposed in this paper,which mainly include window comparator,reversible counter,D/A convertor and voltage controlled oscillator (VCO).Its operating principle is interpreted by theoretical analysis and LC curve diagram.The effectiveness of the proposed scheme is demonstrated experimentally.