MICROCONTROLLER DEVICE FOR DIAGNOSING OF TURN-TO-TURN ISOLATION OF ELECTRIC MOTOR WINDING Russian patent published in 2015 - IPC G01R27/26 

FIELD: electricity.

SUBSTANCE: microcontroller device for diagnosing of turn-to-turn insulation of an electric motor winding comprises (Fig.) MC 1, a voltage divider 2, a reference voltage controlled source 3, the first controlled key 4, an indicator 5, a direct voltage source 6, a winding of an electric motor 7 to be diagnosed, the second key 8 and a sample inductance coil 9. The first output of the direct voltage source 6 is connected to the first outputs of the inductance coils 7 (winding of the electric motor to be diagnosed) and 9 (sample inductance coil), the second outputs are connected to the second output of the second key, which can be placed either in the upper (connected inductance coil 7) or in the lower (connected sample inductance coil 9) position. The first output of the second key is connected to the second outputs of the first controlled key and voltage divider. A control output of the first key is connected to MC 1, a control input of the voltage reference source 3 to the output of a pulse-width modulator (not specified in Fig.) of MC 1, an output of the voltage reference source 3 is connected to the first input of an analogue comparator (not specified in Fig.) of MC1, the middle output of the voltage divider 2 is connected to the second input of the analogue comparator of MC1, the first outermost output of the voltage divider 2 is connected to the first outputs of the controlled key 4 and the direct voltage source 6, the indicator 5 is connected to the output of the respective port of MC 1.

EFFECT: improved accuracy of the device due to the arranged comparison of the self-inductance electromotive force of the sample and diagnosed windings.

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