Modeling and preliminary analysis of a miniaturized rotary motor driven by single piezoelectric stack actuator

Abstract

This paper presents a compact motor (6 mm in diameter) with a single piezoelectric stack actuator and a frame structured stator, which works under the principle of natural inchworms. Preliminary motion analysis and dynamic modeling are conducted based on the assumption of structural rigidity. The prototype can generate output torque of about 279 nNm and speed up to 200 rpm with a power input of 60 Vpp at the frequency of 12.7 kHz. In addition, rotational concentricity of the motor is discussed via analyzing captured video of the operating motor. Compared with the previous prototype that is 17 mm in diameter, the simplicity of the motor structure provides an effective miniaturization solution, which is important to many applications such as medical instruments and consumer electronics

Non-smooth model and numerical analysis of a friction driven structure for piezoelectric motors

“…The net displacement of the rotor per operation period reaches a minimum value at the drive frequency of 180 Hz, tends to zero with the drive frequency approaches zero and arrives at its maximum while the drive frequency approaches infinity. As a result, velocity of the rotor is approximately proportional to the drive frequency when the frequency is relatively high, which validates the assumptions and modeling work presented previously [25,26].…”