# Research and Design of a Bidirectional Self-Propelled Traveling Wave Type Linear Ultrasonic Motor

## TL;DR

This paper introduces a new linear ultrasonic motor that can move in both directions using a unique stator design with piezoelectric plates.

## Contribution

The novelty lies in the bidirectional operation of the motor achieved by switching piezoelectric modes at both ends of the stator.

## Key findings

- A finite element model confirmed the motor's performance through modal and harmonic response analyses.
- The design successfully alters the traveling wave propagation direction for bidirectional movement.
- Transient analysis verified the correctness of the proposed motor structure.

## Abstract

This paper proposes a bidirectional self-propelled traveling wave linear ultrasonic motor. The motor adopts a straight-beam stator structure, with two piezoelectric ceramic plates arranged at each end of the stator. One end operates in the inverse piezoelectric mode, while the other operates in the piezoelectric mode. By switching the piezoelectric/inverse piezoelectric modes at both ends, the propagation direction of the traveling wave component in the stator can be altered, thereby achieving bidirectional operation of the linear ultrasonic motor. A finite element model of the motor is established, and its performance is analyzed through modal analysis, harmonic response analysis, and transient analysis, verifying the correctness of the design.