FIELD: electricity.
SUBSTANCE: device to control and ensure durability of a double-fed motor comprises an induction motor, a frequency converter made of a controlled rectifier and an inverter, a three-phase transformer. The rectifier is made as a grid thyristor converter, and the inverter - as a rotor thyristor converter arranged in accordance with a bridge three-phase circuit. The device additionally comprises current sensors, protective elements, two reserve half-bridges, each comprising three symistors and two reserve thyristors, and a microcontroller, which is connected to all thyristors and symistors. The specified elements are connected as specified in application materials.
EFFECT: provision of durability of an electric drive arranged on the basis of a double-fed motor in case of emergency faults of a half-bridge of a rotor converter and a grid converter with faults of thyristor non-disconnection or non-connection type.
2 cl, 2 dwg
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Authors
Dates
2014-08-10—Published
2013-02-07—Filed