V型超声波电动机驱动头斜椭圆运动的理论分析

Theory Analysis on Driven Head’s Elliptic Motion of the V-Shape Linear Ultrasonic Motor

为有效提高V型直线超声波电动机的工作稳定性,对电机实际工作过程中驱动头的椭圆运动进行了分析。通过坐标变换,分析得出该型电机驱动头的椭圆运动轨迹为一斜椭圆。该电机驱动头的斜椭圆轨迹不仅与两个兰杰文振子的纵向振幅有关还和安装角θ有关。采用等速点分析的方法,利用冲量定理对正常安装形式下驱动头的斜椭圆轨迹在一个运动周期内对电机动子的驱动过程进行了完整分析,并得到了该型电机的机械特性方程,仿真了在该安装形式下电机的机械特性。通过和同类电机的试验对比,可以确定所得到的机械特性方程的正确性。

To improve the stability of the V-shape linear ultrasonic motor,the elliptic movement of driven head in actual work process was analyzed,and the ellipse was inclined.The inclined ellipse was relatated not only the longitudinal vibration of the Langevin vibrators,but also the installation angle.Using impulse theorem,the driving process of the inclined ellipse in a complete movement cycle was also analyzed,and the mechanical output properties of the motor were got.Through the contrast test,the correctness of the motor’s mechanical output properties was proved.