MOSFET PWM回路によって駆動されるDCサーボモータの等価電機子抵抗の一推定法

概要

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Modern control systems for DC Servomotors mainly employ a digital circuit. However, in these systems an analog circuit is used for detecting the armature current. The combination of digital and analog techniques causes hardware complexity.In this paper a new digital method to estimate the sum of the armature resistance and output resistance of a PWM operated drive is proposed, presenting some test results. Since in this feedback control scheme the voltage applied to the motor is always varying, speed and pulse-width data, which are continuously changing and sampled once a pulse cycle, are used for the estimation of the equivalent armature resistance. This estimation method is based on the comparison of 1, 000 measured speed data and the computed values from the same number of pulse-width data and several assumed parameters.This study yielded the following conclusions: (1) not only the temperature variation of the armature resistance but that of the output resistance of a drive circuit has a large influence on the system performance, (2) the sum of these resistances can be obtained using a full-digital estimation method, and (3) this technique can be applied to a full-digital LSI for motor control.
社団法人電気学会の論文