Abstract
On the basis of analysis of means and methods for technical diagnostics the authors suggest to use a transient process of no-load starting of electric traction motors as a general-purpose testing action for determination of faults of electrical machines including reasons of bad commutation of motors. The authors have carried out experiments on starting of electric motors of various brands. As a result, they have got oscillograms of voltage of faulty and non-faulty direct current electrical machines precisely described in the paper.
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