In this work a piezoelectric motor is described whose stator is composed of a cylindrical steel axle fitted at the center of a thin piezoelectric membrane. The rotor consists of a cylindrical permanent magnet, pressed in contact with the top surface of the axle, by means of magnetic forces. A travelling wave, at the natural flexural vibration of the thin piezoelectric membrane, is excited via the piezoelectric effect. The vertical displacement of the membrane is geometrically amplified by the central axle, obtaining a wide precessional motion of the axle. On this motion is based the transmission mechanism of the proposed motor. The motor is able to give a relatively high speed (/spl ap/3500 rpm) and torque (1.8/spl middot/10/sup -5/ N/spl middot/m) by using a commercial piezoelectric membrane (diameter 32 mm, thickness 0.2 mm), driven at relatively low voltage (18 V P-P). The very small thickness of the stator makes this motor suitable for microsystem applications. A simple analytical model of the transmission mechanism is discussed, and the predicted results are compared with experimental measurements, with a satisfactory agreement.
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机译:在这项工作中,描述了一种压电马达,其定子由装配在薄压电膜中心的圆柱形钢轴组成。转子由一个圆柱形的永磁体组成,该永磁体通过磁力与轴的上表面接触。薄压电膜的自然弯曲振动会通过压电效应激发行波。膜片的垂直位移在中心轴处得到几何放大,从而获得轴的宽进动。基于该运动,提出了电动机的传动机构。通过使用商用压电膜片(直径32 mm,电动机能够提供相对较高的速度(/ spl ap / 3500 rpm)和扭矩(1.8 / spl middot / 10 / sup -5 / N / spl middot / m)。厚度为0.2毫米),以相对较低的电压(18 V PP)驱动。定子的极小厚度使其适合于微系统应用。讨论了传动机构的简单分析模型,并将预测结果与实验测量结果进行了比较,并取得了令人满意的协议。
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