testing DC armatures
testing DC armatures
(OP)
I have a 50 slot 200 bar armature that I want to test for shorted turns, I'm wondering what is the best method of testing it.
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RE: testing DC armatures
Tests that need to be carried out that would indicate a problem winding would include.
1 Insulation resistance to earth.(Most people would say 1meg as a min)
2 Bar to bar continuity and resistance, this will require the use of a micro-ohmeter or ductor to provide accurate results. (Depending on the winding design you may have a pattern of high and low figures that constantly repeats, for instance hi hi hi low, hi hi hi low etc).
3 Growler test to indicate shorted coils.
4 Volt drop test, AC is induced into the armature and the voltage measured off the bars, this is usually done in conjunction with the growler test.
The test equipment needed is quite specialist, expensive and usually only found in repair shops. You may be able to hire it if you are confident about using it. My suggestion is to get it into a good shop and ask them to do the tests with you present.....then ask lots of questions.
RE: testing DC armatures