Control Techniques for Electric Drives

Transient Response of Closed Loop Drive System: The Transient Response of Closed Loop Drive System is of fundamental importance and must be investigated in detail. The time response of a system to specified inputs gives information with respect to the following characteristics: 1.Whether the system is stable or unstable. The system is said to be […]

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: 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: 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 – 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

Signal Flow Graph of DC Motor in Electric Drive System: The Signal Flow Graph of DC Motor in Electric Drive System block diagram representation discussed above is adequate only for simple systems having components with one input and one output. When a system is complex, having many variables, the block diagram reduction may become a

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: 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.

Introduction Control Techniques in Electric Drives: An electric drive is a well established industrial drive as it has several ad­vantages and special features. Its Control Techniques consists in starting, speed control, braking and speed reversal, and also maintaining the drive conditions required by the process or work being performed by the drive. Modern electric drives