SPECIAL ELECTRICAL MACHINES UNIT I AC COMMUTATOR MOTORS 9 Principle of operation Equivalent circuit Phasor diagram Performance of Repulsion motor and Universal motor. UNIT II STEPPER MOTORS 9 Constructional features Principle of operation Variable reluctance motor Single and Multi stack configurations Permanent Magnet Stepper motor Hybrid stepper motor Different modes of excitation Theory of torque predictions Linear and non-linear analysis Characteristics Drive circuits. UNIT III SWITCHED RELUCTANCE MOTORS 9 Constructional features Principle of operation Torque prediction Power controllers Nonlinear analysis Microprocessor based control Characteristics Computer control. UNIT IV PERMANENT MAGNET MOTORS 9 Principle of operation Types Magnetic circuit analysis EMF and Torque equations Power Controllers Motor characteristics and control of PMDC, PMSM, and BLDC motors. UNIT V LINEAR MOTORS 9 Linear Induction motor (LIM) classification Construction Principle of operation Concept of current sheet Goodness factor DC Linear motor (DCLM) types Circuit equation DCLM control applications Linear Synchronous motor (LSM) Types Performance equations Applications. Total: 45 TEXT BOOK 1. Miller, T. J. E., Brushless Permanent Magnet and Reluctance Motor Drives, Clarendon Press, 1989. 2. Taylor, E.O., The Performance and Design of AC Commutator Motors, Sir Issac Pitman and Sons, 1998. REFERENCES 1. Kenjo, T., Stepping Motors and their Microprocessor Controls, Clarendon Press, 1984 2. Naser, A. and Boldea. L., Linear Electric Motors: Theory Design and Practical Applications, Prentice Hall of India, 1987. 3. Murphy, J.M.D., Power Electronics Control of AC Drives, Pergamon Press, 1988. 4. Bose, B.K., Power Electronics and Variable Frequency Drives, Prentice