exam5 - EE321 Exam 5 Spring 2007 Write your name and...

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EE321 Exam 5 Spring 2007 Write your name and student ID on the bluebook. Only turn in the bluebook. Notes : You must show work for credit. Handy trigonometric identities: () () () dx du u u dx d dx du u u dx d B A B A B A B A B A B A B A B A B A B A B A B A B A B A B A cos ) sin( sin ) cos( ) sin( ) sin( 2 1 cos sin ) cos( ) cos( 2 1 sin sin ) cos( ) cos( 2 1 cos cos sin sin cos cos ) cos( sin cos cos sin ) sin( = = + + = + = + + = = ± ± = ± m
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1.) Consider a UI core electromagnetic, such as we considered in class. The reluctance going around the ‘U’ is 100 1 H . The reluctance of the ‘I’ is 25 1 H . The reluctance of the air gap from the ‘U’ to the ‘I’ may be expressed g R g 1000 = which gives a value in 1 H if g is in meters, and where g is the airgap. This reluctance is for one of the two air gaps in the series path. A force of at least 10 N is required when the airgap is 1 mm. If the current is to be 1 A, how many turns are needed to achieve this. [25
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This note was uploaded on 02/19/2012 for the course ECE 321 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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exam5 - EE321 Exam 5 Spring 2007 Write your name and...

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