Electrical Machines III

UNIT I: Theory Of Ideal Synchronous Machines The ideal synchronous machine, synchronous machine inductances, transformation to direct and quadrature axis variables, basic machine relation id dq0 variables, steady state analysis using dq0, transient analysis, three-phase short circuit, transient power angle characteristics, effect of additional rotor circuits. UNIT II: Theory Of Ideal Poly-Phase Induction Machines The ideal induction machine, transformation to dq variables, basic machine relation in dq variables, steady state analysis using dq0, electrical transients in induction machine, single phasing of three-phase induction motor, power invariance. UNIT III: Fractional Horse Power Motor Qualitative examination, starting and running performance of single phase induction motor, revolving field theory of single-phase induction motor, AC tachometer, unbalanced operation of symmetrical two-phase machine, the symmetrical component concept, two-phase control motors. UNIT IV: AC Commutator Motors Rotational EMFs in commutator windings, action of commutator as frequency converter, effect of EMF injection in secondary circuit of three-phase slip-ring induction motor, secondary (slip) power, constant HP and constant torque drives, Kramer and Scherbius system of speed control, single-phase series motors, universal motors, phasor diagrams, methods of improving commutation. UNIT V: Special Motors Hystersis motor, reluctance motor, stepper motor, Synchros and linear induction motor, Permanent magnet brushless BC motor. Text Books: 1. Electrical machines by Fitzerald and Kingseley, 2nd edition, McGrawHill. 2. Performance and design of AC commutator machines by Taylor. Reference Books: 1. Generalized theory of electrical machines by Bimbhra, Khanna Pbs. 2. Power system stability, vol-3 by Kimbark, Wiely 3. General theory of electrical machines by Adkins.