Optimization of stator material and design of slot inclination angle of ultrasonic motors based on response characteristics of stator tooth surface

For traveling wave ultrasonic motor, the contact transmission between stator and rotor is a very important power transmission process, which determines the final output characteristics of the motor. Based on the idea that the uniform dynamic response at each position of the stator tooth surface helps to ensure the close contact between the stator friction plate and the rotor and the efficient operation, this paper proposes that the amplitude ratio of the outer ring and inner ring of the stator tooth surface is taken as the optimization design objective to optimize the stator material and optimize the design of the tooth slot inclination angle. In the finite element model, a refined geometric model including rotor assembly is established, and the influence of pre-pressure on the vibration characteristics of ultrasonic motor and the contact model between stator friction plate material and rotor are considered. The simulation results based on workbench software show that TC11 material has better uniformity of dynamic response of tooth surface among the three candidate materials, and the uniformity of dynamic response on tooth surface is the best when the inclination angle of tooth slot is about 4°.