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UNIT–I: Fundamentals of Electric Drives

1.1 Electric drive

1.2 Fundamental torque equation

1.3 Load torque components – Nature and classification of load torques –

1.4 Steady state stability

1.5 Load equalization– Four quadrant operation of drive (hoist control)

1.6 Braking methods:Dynamic – Plugging – Regenerative methods.

UNIT–II: Three phase converter controlled DC motors

2.1 Revision of speed control techniques – Separately excited and series motors controlled by full converters – Output voltage and current waveforms – Speed-torque expressions – Speed-torque characteristics

2.2 Numerical problems – Four quadrant operation using dual converters

UNIT–III: Control of DC motors by DC–DC converters (Type C & Type D)

3.1 Single quadrant – Two quadrant and four quadrant chopper fed separately excited and series excited motors – Continuous current operation– Output voltage and current waveforms – Speed–torque expressions – Speed–torque characteristics –

3.2 Four quadrant operations – Closed loop operation (Block diagrams only).

UNIT–IV: Induction motor control – Stator side

4.1 Variable voltage characteristics

4.2 Control of Induction Motor by AC Voltage Controllers.

4.3 Waveforms - Speed torque characteristics

4.4 Variable Voltage Variable Frequency control of induction motor by voltage source inverter

4.5 PWM control - Closed loop operation of induction motor drives .

UNIT–V: Control of Induction motor – Rotor side

5.1 Static rotor resistance control - Slip power recovery schemes – Static Scherbius drive – Static Kramer drive

5.2 Performance and speed torque characteristics – Advantages –Applications.

UNIT–VI: Control of Synchronous Motors

6.1 Separate control & self control of synchronous motors, Operation of self controlled synchronous motors by VSI

6.2 Closed Loop control operation of synchronous motor drives (Block Diagram Only)

6.3 Variable frequency control - Pulse width modulation