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This book provides a comprehensive introduction to the fundamental concepts of electric drives and is eminently suited as a textbook for B.E./B.Tech., AMIE and diploma courses in electrical engineering. It can also be used most effectively by all those preparing for GATE and UPSC competitive examinations, as well as by practising engineers. The topics, which range from principles and techniques to industrial applications, include characteristic features of drives, methods of braking and speed control, electromagnetic and solid state control of motors, motor ratings, transients in drive systems, and operation of stepper motors.Hence, the basic speed control methods of a dc motor can be deduced from Eq. ( 3.1) and these are: (a) armature voltage control, and (b) excitation (field current) control. Standard dc ... 3.2 Schematic diagram of the Ward-Leonard method of speed control of dc shunt motors. ... The variable voltage from dc generator is obtained by controlling its field excitation with the help of a potentiometer. Both the dcanbsp;...

Author:N. K. DW, P. K. SEN
Publisher:PHI Learning Pvt. Ltd. - 1999-01-01


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