EE362Homework 2 22March2010

EE362Homework 2 22March2010 - MIDDLE EAST TECHNICAL...

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MIDDLE EAST TECHNICAL UNIVERSITY ELECTRICAL AND ELECTRONICS ENGINEERING DEPARTMENT EE 362 Homework 2 Date: 22.03.2010 Due: 30 March 2010. Please drop your homework in the homework box in the electrical machines lab until 17:00 Q.1. Consider an ac machine with cylindrical rotor and stator. The mean air-gap radius is 20 cm, the core length is 30 cm and the air-gap length is 1 mm. μ 0 =4 π .10 -7 H/m. The stator has a 2 pole, 3 phase, double layer, fractionally pitched, distributed winding spread over 12 slots. Each coil side contains 5 conductors. The stator winding is excited by a 3 phase balanced ac currents given by: i a (t)=10 cos100 π t A, i b (t)=10 cos(100 π t-2 π /3) A, i c (t)=10 cos(100 π t-4 π /3) A Considering the attached sheet: a) Utilizing the information indicated on the expanded stator, find the chording angle (coil span). b) Complete the winding diagram. Suppose that the winding factor of this winding is 0.933. For a time t

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This note was uploaded on 01/30/2011 for the course EE 362 taught by Professor Ermis during the Spring '10 term at Middle East Technical University.

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EE362Homework 2 22March2010 - MIDDLE EAST TECHNICAL...

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