title: Piezoelectric micromotor based on the structure of serial bending arms.
abstract: This paper presents a new piezoelectric micromotor based on the structure of serial bending arms. Serial bending arms are composed of two piezoelectric bimorphs with one end fixed and the other end free, driven by two signals of a biased square wave with a phase difference of pi/2. The free end of a cantilever arm will move along an elliptic orbit so that the cantilever is used to drive a cylinder rotor. The rotor's end surface contacts the free end of the cantilever, resulting in the rotor's rotation. There are six serial bending arms anchored on the base. The driving mechanism of the micromotor is proposed and analyzed. A new micromotor prototype, 5 mm in diameter, has been fabricated and characterized. The maximum rotational speed reaches 325 rpm, and the output torque is about 36.5 microNm.
authors.affiliation: MEMS Research Center, Dalian University of Technology, Dalian, Liaoning 116023, PR China.
authors.forename: Jianhua
authors.initials: J
authors.lastname: Tong
authors.forename: Tianhong
authors.initials: T
authors.lastname: Cui
authors.forename: Peige
authors.initials: P
authors.lastname: Shao
authors.forename: Liding
authors.initials: L
authors.lastname: Wang