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How to calculate the motor winding resistance ?
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Answer Posted / muhammad kamran
although ohm-meter test is thorough enough but its not
complete...to find true result 1st ohm-meter reading is
taken and then in 2nd step a low voltage ac signal is
applied (using step-down transformer)normally 6:1 of
original operating voltage both voltage and current is
taken and Z-l(total impedence is taken) as unit is
performing in ac region not dc while ohm meter is dc
test.... why use this test?
not always the clear result is given by ohm meter test. a
winding may show balance state by ohm-meter but any
irregularity can be detected by AC-impedence test to be sure
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