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Tut1solution - University of Cape Town Faculty of...

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University of Cape Town Department of Electrical Engineering Faculty of Engineering and the Built Environment EEE3057S Mod A / EEE3031S Page 1 of 2 25 August 2010 TUTORIAL: ANWERS 1. Explain why distributed windings are preferred over concentrated windings in AC machines. 2. Explain how a rotating magnetic field is produced in an AC machine. 3. Explain briefly, from first principles, how torque is developed in an induction motor, when the stator is supplied with balanced three-phase currents. 4. If the rotor of an induction motor is rotated at synchronous speed, how much torque will the motor develop? Please explain. 5. Relative to an observer on the stator of an induction machine, the rotating magnetic field due to the stator currents rotates at synchronous speed ns, whilst the machine rotor rotates at angular speed n. At what angular speeds are the following rotating at: (a) The rotating magnetic field due to stator currents, relative to an observer on the rotor.
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