Trapezoidal or sinusoidal commutation control of brushless D.C. motors with pulse width modulation amplifiers

Gary R. Herrington

doi:10.1117/12.2322216

1 September 1990 Trapezoidal or sinusoidal commutation control of brushless D.C. motors with pulse width modulation amplifiers

Gary R. Herrington

Author Affiliations +

Proceedings Volume 1304, Acquisition, Tracking, and Pointing IV; (1990) https://doi.org/10.1117/12.2322216
Event: 1990 Technical Symposium on Optics, Electro-Optics, and Sensors, 1990, Orlando, FL, United States

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.

Citation Download Citation

Gary R. Herrington "Trapezoidal or sinusoidal commutation control of brushless D.C. motors with pulse width modulation amplifiers", Proc. SPIE 1304, Acquisition, Tracking, and Pointing IV, (1 September 1990); https://doi.org/10.1117/12.2322216

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