Write down an expression for Faraday's Law of electromagnetic induction, a) explaining the notation, meaning and...

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Write down an expression for Faraday's Law of electromagnetic induction, a) explaining the notation, meaning and units of all the terms used. Describe with the aid of diagrams how this law underlies the design and operation both of the transformer and the induction drive. b) What are the advantages of induction drives over other types of drives? Name one application where induction drives are commonly used. c) A 3 phase, star connected, 220 V (line to line), 7.5 kW, 60 Hz, 6 pole induction drive has the following constants per phase referred to the stator: R1 = 0.294 2 R2 = 0.144 2 X1 = 0.503 2 X2 = 0.209 2 XM = 13.25 2 %3D Where the above symbols, R1, R2 etc. all have their usual meaning, (i) Sketch the speed torque characteristic for this drive and for a slip of 2.0% calculate the rotor speed. (ii) The losses due to friction, windage and core losses may be assumed constant at 403 W independent of load. Calculate the output power, torque and efficiency. Write down an expression for Faraday's Law of electromagnetic induction, a) explaining the notation, meaning and units of all the terms used. Describe with the aid of diagrams how this law underlies the design and operation both of the transformer and the induction drive. b) What are the advantages of induction drives over other types of drives? Name one application where induction drives are commonly used. c) A 3 phase, star connected, 220 V (line to line), 7.5 kW, 60 Hz, 6 pole induction drive has the following constants per phase referred to the stator: R1 = 0.294 2 R2 = 0.144 2 X1 = 0.503 2 X2 = 0.209 2 XM = 13.25 2 %3D Where the above symbols, R1, R2 etc. all have their usual meaning, (i) Sketch the speed torque characteristic for this drive and for a slip of 2.0% calculate the rotor speed. (ii) The losses due to friction, windage and core losses may be assumed constant at 403 W independent of load. Calculate the output power, torque and efficiency.

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