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Content Provider | IEEE Xplore Digital Library |
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Author | Xu, J. Grant, E. Kingon, A.I. Wilson, J.M. Franzon, P.D. |
Copyright Year | 2005 |
Description | Author affiliation: Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC, USA (Xu, J.; Grant, E.; Kingon, A.I.; Wilson, J.M.; Franzon, P.D.) |
Abstract | A mode conversion rotary ultrasonic motor (USM) has potential applications in miniature robotics. However, its electrical drive circuit presents some unique challenges, particularly in producing a high frequency (/spl sim/40 kHz), high voltage (/spl sim/200 V peak-to-peak) signal into a low impedance (/spl sim/100 /spl Omega/) capacitive motor, while achieving high efficiency. This paper describes the design of such a drive circuit, intended for use with a 12 V battery. The drive circuit consists of a switch-mode power converter driving the USM via a step-up planar transformer. Compensation and resonant elements are added to improve the power efficiency. While the peak efficiency of this circuit is 45%, in practice the equivalent impedance of the USM changes with mechanical load and temperature, resulting in an average efficiency of 16%. The admittance vs. frequency characteristic and the equivalent electrical model for a USM prototype are also presented in this paper. The circuit simulations and loaded testing of a full-bridge DC-AC resonant converter with DC-offset module were performed. A load-adapted frequency tracking method has also been proposed to improve the efficiency and stability of the drive circuit. |
File Size | 621029 |
File Format | |
ISBN | 0780392523 |
DOI | 10.1109/IECON.2005.1569141 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 2005-11-06 |
Publisher Place | USA |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Frequency Impedance Resonance Circuit testing Robots Voltage Batteries Switching circuits Switching converters Temperature |
Content Type | Text |
Resource Type | Article |
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