DEVICE FOR CONTROL OF LIFTING ELECTROMAGNET Russian patent published in 2005 - IPC

FIELD: electrical engineering, applicable for control and feeding of lifting electromagnets.

SUBSTANCE: the device for control of lifting electromagnet has a magnetization rectifier and a demagnetization rectifier, whose power inputs are connected to the phases of the electric network, and the output circuits - to the first and second output leadouts used for connection of the coil of the lifting electromagnet. The outputs of the control unit are connected to the control inputs of the magnetization rectifier and the demagnetization rectifier. Two current transducers are series-connected to the first and second output leadsouts, the outputs of these transducers are connected to the inputs of the control unit. The current transducers are made in the form of a circular magnetic circuit enveloping the output circuit of the magnetization rectifier, a communication winding is positioned on the magnetic circuit, which is connected to the output circuit of the demagnetization rectifier, and a Hall generator is installed in the break of the magnetic circuit, the Hall generator output serves as the output of the current transducer.

EFFECT: enhanced reliability of operation at a control of the leakage current of the electromagnet coil.

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