HIGH VOLTAGE ELECTRIC DRIVE OF ALTERNATING CURRENT (VERSIONS) Russian patent published in 2008 - IPC H02P1/30 H02P6/14 H02P6/20 H02P27/04 H02M7/516 

FIELD: electricity.

SUBSTANCE: composition of the electric drive of an alternating current includes the frequency converter, the invention can be used for the launching and control of the work of asynchronous or synchronous electric drives with the working voltage 6...10 kV and power of up to tens of mW. The high-voltage electric drive of the alternating current with the three-phase electric motor contains a source of an adjustable direct current, three-phase bridge thyristor chopper, switching devices connected to the outputs of alternating current of the inverter consistently with the phases of the three-phase winding of the electric motor, sensors of current and voltage and the control devices of the inverter and switching devices. Each switching device contains a capacitor with two outputs and the bidirectional symmetric operated semi-conductor key connected in parallel to it completely. Starting of the switching device in the electric drive is carried out in the manner as it specified in the materials of application for each of the three variants. In the electric drive for each of the variants protection of semi-conductor keys is provided at extraordinary and emergency situations.

EFFECT: reduction in the cost; increase of technical and economic parameters and reduction of expenses for the current operational service of the electric drive.

3 cl, 21 dwg