Shanghai Jiao Tong University, Instrument Science and Engineering, Shanghai, China.
IEEE Trans Ultrason Ferroelectr Freq Control. 2011 Aug;58(8):1641-50. doi: 10.1109/TUFFC.2011.1991.
An analytical model is presented to explain the effects of dual-frequency drive on the plate ultrasonic motor in this paper. The experimental prototype is a plate ultrasonic motor using single-phase asymmetric excitation, which can work under a single vibration or multiple vibration modes. Based on the linear superposition of vibrations with two different excitation frequencies, an analytical model is established using the classic Coulomb friction model, and the non-load rotation speed and maximum stall torque are deduced. Moreover, some crucial parameters such as preload and dead-zone in dual-frequency superposition model are identified or modified automatically by searching for the maximum correlation coefficient between simulation and experimental data using single-frequency drive. It is found that simulation and experiment results agree well when no excitation frequency component is at resonance.
本文提出了一种分析模型，用以解释双频驱动对板超声马达的影响。实验样机是采用单相不对称激励的板超声马达，它可以在单一振动模态或多种振动模态下工作。基于两个不同激励频率的线性叠加，利用经典的库仑摩擦模型建立了一个分析模型，并推导出空载转速和最大静摩擦力矩。此外，通过使用单频驱动搜索模拟和实验数据之间最大相关系数的方法，自动识别或修改双频叠加模型中的预紧力和死区等关键参数。结果表明，在没有激励频率分量发生共振的情况下，模拟和实验结果吻合较好。
