High-Accuracy Speed Controller Using Pulse Counting Methods

概要

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This paper reports a digital controller for accurate speed control of electric motors. The speed is measured by counting the number of pulses from the pickup for a precisely determined period. The comparison of the measured speed with the reference is performed by a preset counter through a relatively simple method. An analog integrator is used to convert the digital error signal into a voltage signal. This voltage is fed into a power amplifier and controls the motor. The main part of this controller is multiplexed by time-division so that it can control two motors at a time. A new pulse frequency multiplier, which is useful for the digital speed control, is also developed. The principles and circuits of those devices as well as some test results are described in this paper.
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