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Digital Motor Speed Control

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1 Author(s)
Shoop, W.F. ; Electronics Division Space Technology Laboratories, Inc. Redondo Beach, California

Digital motor speed control is a unique method of highly accurate pulse frequency modulation as applied to speed control of a hysteresis synchronous motor. This method utilizes digital techniques to obtain motor speed accuracy and stability of better than 0.001 percent of the desired value. The device described is basically a digitally controlled variable frequency oscillator whose output pulse frequency is a function of an input command to the system. Frequency modulated pulses, after suitable shaping and power amplification, are applied to the windings of a two phase hysteresis synchronous motor. The speed of the motor is therefore controlled by the input command. A variety of auxiliary feedback loops can be utilized with the method presented to perform various types of control functions.

Published in:

Aerospace and Navigational Electronics, IEEE Transactions on  (Volume:Technical_Paper ,  Issue: 0 )

Date of Publication:

Oct. 1963

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