Blog for students taking ECEN4797/5797 Introduction to Power Electronics, ECEE Department, University of Colorado at Boulder, Fall 2011
Thursday, November 17, 2011
Problem 13.5
Very curious. I am getting 1000's of amperes for the MMF source for the permanent magnet. This sounds wrong but may be an indication of how powerful magents can be. Any one else getting 1000's of amperes?
I have a solution to the mmf in the thousands as well. I think the thing to keep in mind is that the unit of mmf is ampere-turns. This follows along with our voltage source labeled "ni" to represent mmf in magnetic circuit models. Since turns are involved I think it's reasonable to expect high values since there can be many turns of wire.
3 comments:
Yes. In the 1000's. But isn't it due to the relatively high residual.
I have a solution to the mmf in the thousands as well. I think the thing to keep in mind is that the unit of mmf is ampere-turns. This follows along with our voltage source labeled "ni" to represent mmf in magnetic circuit models. Since turns are involved I think it's reasonable to expect high values since there can be many turns of wire.
Thanks for the feedback. The remnant magnetism is certainly a erason for the high equivalent MMF.
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