FIELD: electromechanical engineering; indirect methods for testing electrical machines. SUBSTANCE: for measuring air gap characteristics of electrical machines electromagnetic field is excited relative to fixed mass using for the purpose dc current of 0.5 to 0.75 of electrical machine rated value; electromagnetic field being excited is alternately oriented according to position of air gap under test at the same time measuring signals proportional to electromagnetic field in air gap between moving and fixed masses, measured signals are compared, and results of comparison are used to determine geometry of air gaps. EFFECT: enlarged capabilities of air-gap irregularity measurement method for electrical machines. 6 dwg
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