Design and analysis of a standing-wave trapezoidal ultrasonic linear motor

This study presents a standing-wave trapezoidal ultrasonic linear motor. The motor consists of a trapezoidal piezoceramic plate with slanted sidewalls and a clip fastener to achieve bidirectional linear motion. The prototype fabrication and experiments in this study confirm the validity of the proposed structure and simulation results, including the theoretical equations, the travel distance, output force, and clip force of the clip fastener. The proposed standing-wave trapezoidal ultrasonic linear motor is easy to assemble because it has only three essential components with a self-clip force on the slanted sidewalls of the trapezoidal piezoceramic plate. To reduce the sound level in the acoustic frequency range, a muted clip fastener with a pair of solid bronze rods inserted in the hollow space to decrease the emitted sound frequency was proposed. A trapezoidal piezoceramic plate sized 22 × 8 × 1.5 mm³ and providing a travel distance of 10.10 mm and an output force of 12.151 g at a driving voltage of 10 V is useful for compact products.