August 2019
Intermediate to advanced
511 pages
17h 17m
English
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Chapter 4
D.C. motor drives
Abstract
Our focus here is on the power electronic converter/d.c. motor drive, which, although no longer pre-eminent, is—like the d.c. motor itself—an ideal learning vehicle. We look at the structure and operation of the converter in motoring and generating modes; introduce four-quadrant operation, and explore the effects of the less-than-ideal waveforms on the motor and on the supply. The benefits of a two-loop speed control system (which is reflected in the majority of other motor drives) are explained.
Keywords
D.C. motor drive; Speed control; Current control; Torque control; Waveform ripple; Discontinuous current; Power factor; Harmonics
4.1 Introduction
Until the 1960s, the only satisfactory way of obtaining the variable-voltage ...
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