## Ward Leonard Drive Transfer Function

Ward Leonard Drive Transfer Function: In the classical Ward Leonard Drive Transfer Function, the dc drive motor having constant excitation is supplied from a variable voltage generator, as shown in Fig. 6.9. The generator is driven at constant speed. The field current of the dc generator is varied by varying the field voltage to have […]

## Transfer Function of a Field Controlled DC Motor

Transfer Function of a Field Controlled DC Motor: The speed of a dc motor can be varied by varying the field current. The speed can be increased beyond base speed by decreasing the field current. The Fig. 6.8(c&d) shows the Transfer Function of a Field Controlled DC Motor. In this type of control constant torque operation […]

## Transfer Function of Armature Controlled DC Motor

Transfer Function of Armature Controlled DC Motor: The speed of a dc motor can be controlled by varying the voltage applied to the armature of a dc motor. A separately excited dc motor with variable armature voltage finds application as a drive motor in a variable speed drive. The variable armature voltage is provided by […]

## Closed Loop Control of DC Motor

Closed Loop Control of DC Motor: Closed Loop Control of DC Motor – The dynamic behaviour of a system is described by a set of differential equa­tions. On many occasions the solution of these equations requires the evalu­ation of convolution integrals which may be a difficult task. In such cases a simpler analysis is made […]

## Block Diagram of Electric Drive System

Block Diagram of Electric Drive System: It is normal practice in control engineering to represent a control system by means of a Block Diagram of Electric Drive System, with a systematic connection of blocks in the direction of signal flow, showing the functions performed by each component of the system. A control system is dynamic […]

## Features of Electric Drive System

Features of Electric Drive System: Before applying advantageously the control principles to electric drive systems to adjust or improve their behaviour as a special case of control problem, it is necessary to have a knowledge of the specific Features of Electric Drive System, which can be summarized as follows with reference to its electrical characteristics. […]

## DC Motor Basic Machine Equation

DC Motor Basic Machine Equation: When dc voltage is applied to the armature of a dc motor with its field excited by dc, a torque is developed and the armature rotates. It accelerates to a speed at which the emf induced in the armature conductors balances the applied voltage and the following DC Motor Basic […]

## DC Motor Speed Control

DC Motor Speed Control: In the foregoing sections we discussed the torque-speed characteristics of dc motors, bringing out the effects of armature voltage variation and field current on them. The discussion also applies to the study of the methods of DC Motor Speed Control, which may be summarised as follows: Variation of armature voltage by […]