Open AccessImplementation of frequency drive into the mechanism of transshipping crane travelling
Author(s) -
D. V. Belykh,
К. В. Лицин
Publication year - 2020
Publication title -
černaâ metallurgiâ. bûlletenʹ naučno-tehničeskoj i èkonomičeskoj informacii/černaâ metallurgiâ. bûlletenʹ naučno-tehničeskoj informacii
Language(s) - English
Resource type - Journals
eISSN - 2619-0753
pISSN - 0135-5910
DOI - 10.32339/0135-5910-2020-7-733-739
Subject(s) - electric motor , rotor (electric) , induction motor , control theory (sociology) , synchronization (alternating current) , engineering , schematic , asynchrony (computer programming) , shovel , automotive engineering , computer science , asynchronous communication , voltage , electrical engineering , mechanical engineering , control (management) , topology (electrical circuits) , telecommunications , artificial intelligence
Travelling of transshipping crane, located at the coal warehouse of the coke and chemical production of Ural Steel JSC, is carried out using eight asynchronous motors with a phase rotor. To control the speed of its travelling, a device is used that regulates the speed variation of the asynchronous motors with a phase rotor by varying the resistances in the rotor circuit, which does not provide the necessary synchronization of their operation. Asynchrony in the operation of electric motors leads to a skew in the flexible support of the crane and, consequently, to an increase of the time of technological operations fulfilment. This means reduction of the amount of work performed. A solution to the problem is proposed by implement an electric drive frequency control into the mechanism of the transshipping crane travelling. This will significantly reduce the loss of electrical energy during transients and ensure the best performance indices. Calculation and selection of the necessary elements of the frequency control system of the electric drive were carried out. A schematic electrical diagram of the connection of an electric drive for travelling the transshipping crane is given. A system has been developed for automatic control of an electric drive. The system is based on speed regulation with an indirect orientation of the rotor flow grip vector, which allows matching the speed of asynchronous motors. The analysis of the obtained transient processes of speed and moment is made. The efficiency of the proposed engine matching scheme is confirmed by the elaborated mathematical model. The proposed system allows eliminating the skew in the flexible support of the crane caused by jerks during the travelling of the crane and reducing energy consumption by 4%. The proposed solution the drive perfection can be used at modernization of bridge transshipping cranes, used at loading and unloading operations and at transportation of goods with stable cargo flows in the warehouses of metallurgical plants, ports, thermal power plants, etc.