弯振模态板状直线超声电机的研究

Research on Slab-type Linear Ultrasonic Motor Based on Bending Mode

通过改进直线超声电机的驱动足、夹持等结构形式,提高了电机的输出特性。设计了一款新型直线电机,电机由对称分布的板状振子和具有柔性的驱动足组成。通过ANSYS软件建立了电机有限元模型并分析电机工作模态,根据模态一致性原则设计电机尺寸;利用板状结构的弯振模态,降低了驱动频率,提高了输出效率;电机驱动足具有一定的柔性,在夹持组件作用下实现预压力的施加。最后对样机开展实验研究,结果表明,电机定子模态测试数据与仿真分析结论吻合,工作频率为27.5kHz,附近无干扰模态,相位差为90°,工作时发热较少;最大输出力为44N;双向驱动速度一致性良好,其中最大输出速度为267mm/s。

The output characteristic of the linear ultrasonic motor was improved through the improvement of the driving foot structure and clamping method.A novel slab-type linear motor was designed,which consisted of the symmetric slab-type vibrators and flexible driven feet.The motor's finite element model was established by ANSYS software and the operating mode was analyzed.The size of the motor was designed according to the modal consistency regulation.The driving frequency of the motor was reduced and the output efficiency was improved by making use of the bending mode of the slab-type structure.Since the driving foot of the motor has a certain flexibility,the prepressure application can be realized under the effect of the clamping component.Finally,the experiment on the prototype was carried out.The results showed that the modal test data of motor stator was identical with the simulation analysis.The operating frequency was 27.5kHz,the phase difference of the applied two signals was 90°and there was no interference mode around it.The maximum output force was up to 44 Nand the maximum speed was 267mm/s with good consistency of two-way driving speed.