A simple digital control scheme for a DC motor

A simple control algorithm, based on a conditional branch-and-jump instruction set, for the speed control of a separately excited DC motor, is described. The proposed scheme incorporates direct digital control of the firing angle of the thyristors in the power amplifier and a new hybrid tachogenerator with a low ripple content. The very simple realisation of the control law allows sufficient time during the sampling period for an on-line health monitoring role to be incorporated in the total scheme.