Electric Machines

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Electric Machines
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2) (a) Describe the principle of operation of 3-phase induction motor. [8 Marks](b) Explain slip as applied to three phase induction motor. [2 Marks]3) Derive an expression for the total armature torque of DC motor. [10 Marks]5) List the starting methods used in starting 3-phase induction motors and explain any two of these methods. [10 Marks]6) (a) A 60 kW, 400 V d.c. shunt motor has 4 poles a 2-circuit wave-connected armature winding with 450 conductors. The flux per pole...