FIELD: electrical engineering.
SUBSTANCE: invention relates to electrical engineering and can be used for testing electrical and mechanical damages of induction motors supplied from frequency converters. Multi-phase voltage with 50%-symmetric pulse-width modulation is fed intermittently during operations or breaks. Note here that appearance of current in phase is controlled. Availability of current flowing in motor phase at the moment above and current character will testify either availability or presence of motor winding damage.
EFFECT: possibility to test frequency-controlled motor by rated voltage in both operation and breaks.
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