| 摘要 |
Electrical system for emergency power supply to a brake release, especially in overhead travelling cranes, in which the direct current source, an electrical battery, is connected to an inverter, the integral part of which is a set of backward diodes, characterised in that the energy accumulator (5) is connected to the diodes forming an integral part of the inverter (4), and the output of the inverter (4) is connected to the primary winding of a three-phase matching transformer (3), whereas the secondary windings of the transformer (3) are connected to the brake release (2) and at the same time to the supply-control system (1) of the drive, and that the output of the inverter control system (6) is connected to the inverter (4), and the inputs of the inverter control system (6) are connected to the speed transducer (7) and the speed sensor (8) of the drive, preferably a speed-to-current converter mechanically coupled with the device.<IMAGE>
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