MICROCOMPUTER CONTROLLED TORQUE IN DC. DRIVES

Abstract

Many applications, such as diesel - electric locomotives or all-electric automobiles, and steel plant, require fast torque control. The object of this thesis is to control the torque of DC separately excited motor fed from single phase half controlled converter, using microcomputer. There are many techniques to determine torque, using either direct or indirect methods. The biggest problem of the direct method using a torque- meter with, (e.g., strain gauges built into a wheatstone bridge) is that measuring device must be placed between the motor, and the load respectively. This thesis avoid this difficulty by using the indirect method, particularly by measuring some quantities of the DC. machine itself, such as voltage, current, and speed, which are easier to determine experimentally. since any mechanical impact on the installation is avoided,'this technique is clearly advantageous in practice.