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2008年 第3卷 第1期

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《机械工程前沿（英文）》 >> 2008年 第3卷 第1期 doi: 10.1007/s11465-008-0018-1

Bi-modes alternation stepping ultrasonic motors

Precision Drive Laboratory, Nanjing University of Aeronautics and Astronautics;

发布日期： 2008-03-05
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Based on the principle of alternative operation of two bending vibration modes in an annular stator, this paper presents a standing-wave stepping ultrasonic motor characterized by no accumulative errors driven by an open-loop control circuitry. The driving forces are generated from the motions of projections on the stator in two modes. The positioning of the motor is achieved by the cooperation between the stator projections and rotor teeth, and the number of the rotors determines the stepping angle of the motor. Two-phase sinusoidal signals corresponding to the two modal frequencies drive the motor bi-direction stepping rotation via a switch unit. The prototype runs steadily without miss-step on trial. The single-step angle displacement of the motor is 2.5°.

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