UNIT

DETAILS

HOURS

I

Three phase induction motor: Construction-squirrel cage and slip ring motors principle of operation-slip and frequency of rotor current-mechanical power - developed torque- phasor diagram-torque-slip curve-pull out torque-losses and efficiency.

No load and locked rotor tests-equivalent circuit-performance calculation from equivalent circuit-circle diagram-operating characteristics from circle diagram-cogging and crawling and methods of elimination.

16

II

Starting of three phase squirrel cage induction motor-direct on line starting-auto transformer star delta starting- starting of slip ring motors-design of rotor rheostat-variation of starting torque with rotor resistance.

Speed control-pole changing-rotor resistance control-frequency control-static frequency conversion-Deep bar and double cage induction motor –equivalent circuit -applications of induction machines-single phasing-analysis using symmetrical components.

14

III

Induction Generator: Theory- phasor diagram-Equivalent circuit-Synchronous Induction motor-construction-rotor winding connections-pulling into step

Single phase Induction motor: Revolving field theory- equivalent circuit- torque-slip curve starting methods-split phase, capacitor start-capacitor run and shaded pole motors.

10

IV

Commutator motors-principle and theory-emf induced in a commutator winding- Single phase series motor :theory –phasor diagram-compensation and interpole winding-Universal motor-Repulsion motor: torque production –phasor diagram-compensated type of motors repulsion start and repulsion run induction motor-applications-Reluctance motor-Hysterisis motor.

10

V

Construction-principle of operation, operating characteristics of stepper motor, switched reluctance motor, BLDC motor, Permanent magnet synchronous motor, linear induction motor-principle-application-magnetic levitation

10

  TOTAL HOURS

60