Electric Motors for BE VTU Course 18 OBE & CBCS (IV- EEE - 18EE44)

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Module-1 DC Motors : Classification, Back emf, Torque equation, and significance of back emf, Characteristics of shunt, series & compound motors. Speed control of shunt, series and compound motors. Application of motors. DC motor starters - 3 point and 4 point. Losses and Efficiency - Losses in DC motors, power flow diagram, efficiency, condition for maximum efficiency. (Chapters - 1,2) Module-2 Testing of DC Motors : Direct & indirect methods of testing of DC motors-Brake test, Swinburne’s test, Retardation test, Hopkinson’s test, Field’s test, merits and demerits of tests. Three Phase Induction Motors : Review of concept and generation of rotating magnetic field, Principle of operation, construction, classification and types; squirrel-cage, slip-ring (No question shall be set from the review portion). Slip, Torque equation, torque-slip characteristic covering motoring, generating and braking regions of operation, Maximum torque, significance of slip. (Chapters - 2,3) Module-3 Performance of Three-Phase Induction Motor : Phasor diagram of induction motor on no-load and on load, equivalent circuit, losses, efficiency, No-load and blocked rotor tests. Performance of the motor from the circle diagram and equivalent circuit. Cogging and crawling. High torque rotors-double cage and deep rotor bars. Equivalent circuit and performance evaluation of double cage induction motor. Induction motor working as induction generator. (Chapter - 4) Module-4 Starting and Speed Control of Three-Phase Induction Motors : Need for starter. Direct on line, Star-Delta and autotransformer starting. Rotor resistance starting. Speed control by voltage, frequency, and rotor resistance methods. Single-Phase Induction Motor : Double revolving field theory and principle of operation. Construction and operation of split-phase, capacitor start, capacitor run, and shaded pole motors. Comparison of single phase motors and applications. (Chapters - 5,6) Module-5 Synchronous Motor : Principle of operation, phasor diagrams, torque and torque angle, Blondel diagram, effect of change in load, effect of change in excitation, V and inverted V curves. Synchronous condenser, hunting and damping. Methods of starting synchronous motors. Other Motors : Construction and operation of Universal motor, AC servomotor, Linear induction motor and stepper motors. (Chapter - 7)

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Author: [U.A.BAKSHI, M.V.Bakshi] Pages: 434 Edition: 2021 Vendors: Technical Publications