Abstract
The paper is concerned with the problems associated with starting a long conveyor driven by an induction motor. We consider the dynamic loads in the conveyor belt during start-up, which cause slippage of the conveyor belt on the traction drum leading to its premature deterioration. The relevance of the topic is associated with the high cost of the conveyor belt reaching 60% of the cost of the entire conveyor and more. The aim of the work is to ascertain the possibilities of reducing the wear of the conveyor belt, for example, through the use of the possibilities provided by the system of the electric drive. The possibility of reducing the probability of the conveyor belt slippage by increasing the initial belt tension is noted. However, constant high tension also accelerates belt deterioration. To solve this problem, the use of automatic tension control devices is proposed, as well as the reduction of dynamic loads in the belt by using soft starters based on a thyristor voltage converter, which regulates the amplitude of voltage on the motor stator. The features of an asynchronous motor heating when starting with a constant speed of rotation of the magnetic field are discussed. The interrelation between the start-up duration and the motor stator winding heating with the dynamic loads occurring in the conveyor belt in start-up modes is considered. Modeling results obtained using the Simulink package are presented. Since long start-up modes of asynchronous electric drives based on thyristor voltage converters can lead to motor overheating, especially when the conveyor is restarted under full load and in hot climates, it is advisable to use automatic conveyor belt tension control devices during start-up modes thereby reducing premature belt deterioration together with a decrease in the conveyor motor heating.
Keywords
Conveyor, induction motor, soft-starter, dynamic loads, modeling, traction factor, stator winding, heating.
1. Metodika vybora parametrov rezinotkanevykh konveyyernykh lent dlya karyerov i drobilnykh fabrik predpriyatiy chornoy metallurgii pri pomoshchi EVM [Methods of selection of parameters of rubber-fabric conveyor belts for quarries and crushing factories of ferrous metallurgy enterprises using a computer]. Sverdlovsk: IGD MCHM USSR, 1982. 28 p. (In Russian)
2. Polunin V.T., Gulenko G.N. Ekspluatatsiya moshchnykh konveyyerov [Exploitation of powerful conveyors]. Moscow: Nedra, 1986. 344 p. (In Russian)
3. Kozhubayev YU.N. Snizheniye intensivnosti iznashivaniya transporternykh lent protyazhennykh konveyyerov sredstvami elektroprivoda s nechetkim regulyatorom [Reducing the wear rate of conveyor belts of long conveyors by means of an electric drive with a fuzzy regulator. Abstract of Ph.D. diss.]. St. Petersburg, 2016. 23 p.
4. Liberman Ya.L., Metelkov V.P. Lentochnyy konveyyer [Belt conveyor]. Patent RF, no. 96565, 2010. Bull. no. 22.
5. Liberman Ya.L., Metelkov V.P. Lentochnyy konveyyer [Belt conveyor]. Patent RF, no. 96564, 2010. Bull. no. 22.
6. Liberman Ya.L., Metelkov V.P. Konveyyer [Conveyor]. Patent RF, no. 97721, 2010. Bull. no. 26.
7. Galkin V.I., Dmitriyev V.G., Dyachenko V.P., Zapenin I.V., Sheshko Ye.Ye. Sovremennaya teoriya lentochnykh konveyyerov gornykh predpriyatiy [Modern theory of belt conveyors of mining enterprises]. Moscow: Gornaya kniga Publ, 2011, 545 p. (In Russian)
8. Dmitriyev V.G., Galkin V.I. Investigation of dynamic loads on roller support of loading and linear sections of belt conveyors during transportation of large pieces. Izvestiya vuzov. Gornyy zhurnal. [University news. Mountain Journal], 1975, no 1, pp. 108–112. (in Russian)
9. Turpishcheva M.S., Dulger N.V., Penskiy V.K. Issues of reliability of belt conveyers of port grain terminals. Vestnik Astrakhanskogo gosudarstvennogo tekhnicheskogo universiteta [Bulletin of Astrakhan State Technical University]. Series: Marine Engineering and Technology, 2015, no. 1, pp. 109–112. (in Russian)
10. Zyuzev A.M., Metelkov V.P. [Study of Start-Up Modes of Conveyor Drives]. Elektrotekhnika [Russian Electrical Engineering], 2009, no. 9, pp. 41−45. (in Russian)
11. Braslavskiy I.Ya. Asinkhronnyy poluprovodnikovyy elektroprivod s parametricheskim upravleniyem [Asynchronous semiconductor electric drive with parametric control]. Moscow: Energoatomizdat, 1988. 224 p. (in Russian)
12. Zyuzev A.M., Nesterov K.Ye. Methods for indirect estimation of motor speed in TVC-IM systems. Elektrotekhnika [Russian Electrical Engineering], 2009, no. 9, pp. 45−49. (in Russian)
13. Shakhmeyster L.G., Dmitriyev V.G. Teoriya i raschet lentochnykh konveyyerov [Theory and calculation of belt conveyors]. Moscow: Mashinostroyeniye, 1987. 336 p. (In Russian)
14. Zyuzev A.M., Metelkov V.P. Analytical Method for Evaluation of High-Voltage Induction Motor Rotor Winding Heating at Start-Up Mode. Elektrotekhnicheskie sistemy i kompleksy [Electrotechnical Systems and Complexes], 2017, no. 1 (34), pp. 60−67. (In Russian)
15. Boyko Ye.P., Gaintsev Yu.V., Kovalev Yu.M., et al. Asinkhronnyye dvigateli obshchego naznacheniya [Asynchronous motors of general purpose], under the editorship of V.M. Petrov, A.E. Kravchik. Moscow: Energoatomizdat, 1980. 488 p. (In Russian)
16. Braslavskiy I.Ya., Ishmatov, Z.Sh. Polyakov V.N. Energosberegayushchiy asinkhronnyy elektroprivod [Energy saving asynchronous electric drive]. Moscow: Publishing Center “Academy”, 2004. 256 p. (In Russian)
17. Braslavskiy I.Ya., Zyuzev A.M. Opyt vnedreniya tiristornykh elektroprivodov s fazovym upravleniyem [Experience in the implementation of thyristor drives with phase control]. Automated electric drive. Issue 3. Sverdlovsk: CNTI, 1981. 47 p. (In Russian)
18. Braslavskiy I.Ya. [Reducing the energy consumption of asynchronous electric drives with thyristor voltage converters]. Elektrichestvo [Electricity], 1988, no. 11, pp. 58−60. (In Russian)