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Proceedings Paper

Trapezoidal or sinusoidal commutation control of brushless D.C. motors with pulse width modulation amplifiers
Author(s): Gary R. Herrington
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Paper Abstract

This paper addresses the use of pulse width modulation (PWM) amplifiers to drive brushless direct current (D.C.) motors in either a trapezoidal or sinusoidal commutation control scheme. A review of amplifier classifications and a comparison of the linear amplifier performance with that of the PWM amplifier is presented. Illustrations show the operational flow of two common power stages (T-bridge and H-bridge) when used with PWM and the resulting electrical equations of current flow are shown. A summary of the advantages and disadvantages of the classes of amplifiers is given. The amplifier discussion is then directed to the comparison of trapezoidal and sinusoidal commutation of the brushless D.C. motor with PWM. The electrical equations and waveforms associated with each method are developed to stress the differences between the two methods. Two servo control loop block diagrams illustrate the differences in electronics required by the two methods.

Paper Details

Date Published: 1 September 1990
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Proc. SPIE 1304, Acquisition, Tracking, and Pointing IV, (1 September 1990); doi: 10.1117/12.2322216
Show Author Affiliations
Gary R. Herrington, Texas Instruments, Inc. (United States)


Published in SPIE Proceedings Vol. 1304:
Acquisition, Tracking, and Pointing IV
Sankaran Gowrinathan, Editor(s)

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