exam5 - EE321 Exam 5 Spring 2009 Notes : There are five...

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Unformatted text preview: EE321 Exam 5 Spring 2009 Notes : There are five questions. You must show work for credit. Some problems have more information than is needed. The last two pages of Exam 4 have trigonometric identities. You can tear these off if more convenient. May the flux be with you 1. Consider the UI core shown below. Consider the following parameters: 1 = w cm; 5 = s w cm; 2 = s d cm; 5 = d cm; 1 = g mm; 100 = N . The relative permeability of the magnetic material is 1000. Recall that the permeability of free space is 7 10 4- H/m. Neglecting fringing and leakage flux, as we did in class, find the maximum current for the device if the flux density is to be limited to 1.2 T. (20 pts; A score of 12 pts {raw} satisfies ABET Objective 1) Node 1 Node 3 Node 5 Node 4 Node 8 Node 7 Node 2 Node 6 Depth into page = d g s d s w w w w w N Turns 2. The flux linkage equation of an electromechanical device is ) 1 ( 3 10 4 ) 1 ( 3 5 2 ) 2 ( 2 2 2 2 ) 2 ( 2 2 1 1 1 1 w w i i i i e x i e x i +- +-- + + =- + +...
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exam5 - EE321 Exam 5 Spring 2009 Notes : There are five...

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