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Tutorial_0_2010 - 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 Page 1 of 3 02 August 2010 Tutorial 0: Revision, magnetic circuit and DC-machines Magnetic Circuit 1. Match the terms in column 1 with its closest meaning in column 2: 2. A core of annealed sheet steel is wound with 1500 turns of wire through which a current of 12mA is flowing. If the length of the coil is 20 cm, find the magnetomotive force and field intensity. 3. When it has an annealed iron core, a coil has a flux density of 1.44T at a field intensity of 500At/m. Find µ and µ r . 4. The µ of an annealed iron core is 5600 X 10 -6 (T * m)/At when the current is 80 mA. The coil consists of 200 turns on core 20cm in length. Find H, B, and µ r .
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University of Cape Town Department of Electrical Engineering Faculty of Engineering and the Built Environment EEE3057S Page 2 of 3 02 August 2010 5. A coil has 200 At (Fig. 1a) with a flux of 25 µWb in the iron core. Calculate the reluctance. If the reluctance of the path with an air gap were 800 x 106 At/Wb (Fig. 1b), how much mmf would be
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