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# exam5 - EE321 Exam 5 Spring 2010 Notes You must show work...

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EE321 Exam 5 Spring 2010 Notes : You must show work for credit. Trigonometric identities are towards the back. The last page of exam is blank for extra paper if needed.

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1) 20 pts. A winding has a resistance of 0.1 Ohms. The flux linkage of the device obeys the relationship 3 2 1 5 i e x λ - - = + Suppose the current is held constant at 0.2 A, while the position is moved in accordance with 10 x t = Compute the electromagnetic force, winding voltage, and power into the device at 0.1 t = s.
2) 20 pts. The conductor density of the a-phase of a reluctance machine may be expressed cos 2 as s sm P n N φ = where s N is the peak conductor density, P is the number of poles, and sm is position measured relative to the stator, as usual. The machine has an airgap which may be expressed ( 29 1 cos rm g A B P = - where A and B are constants, and rm is position measured relative to the rotor, as is our custom. Find an expression for the a-phase self-inductance in terms of mechanical rotor

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exam5 - EE321 Exam 5 Spring 2010 Notes You must show work...

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