Abstract
The authors demonstrated the importance of the problem of improving the energy characteristics of the constant speed induction electric drive when it operates in the modes of systematic underload. The main solutions to the problem were analyzed, in particular, the attention was paid to the transfer to stator windings of new design as a result of repair operations. Thus, it is noted that it is of special interest to implement the concept of energy saving in induction electric drives due to application of individual compensation when windings of new design are placed in the rotor slots. Mathematical description of load modes was developed for induction electric drives with an energy saving motor with two stator windings. Two variants of design are considered, the first one, where only electromagnetic link is provided between the stator windings, and the second one providing both electromagnetic and electric connection through the power source between the windings. A set of equations made for the investigated variants of replacement induction motors with the one with two stator windings and the solution of these equations were used to obtain analytic dependences, which make it possible to calculate the actual values of phase currents. Complex amplitude method and the method of space vectors (structure modeling) were used to study the load modes of electric drives in static and the dependence of energy efficiency was developed for the variant where only electromagnetic connection with the compensating winding is provided and for the variant where both electromagnetic connection and separate power supply of windings is provided from power sources. It was found that when only electromagnetic connection is provided, significant improvement of energy efficiency is achieved. When separate power supply is provided, one can obtain additional insignificant improvement of this characteristic (less than 0.5%) for certain values of phase shift of supply voltages. The obtained energy saving effect is insignificant, thus, it is believed that the variant of design with the electromagnetic connection only is more preferable.
Keywords
Induction motor, double-layer winding, compensating winding, electromagnetic connection, separate power supply, equivalent circuits, mathematical description, energy efficiency.
1. Avtomatizirovannyi electroprivod [Automatic electric drive]. Ed/ N.F. Ilyinskiy, M.G. Yunkov. Moscow: Energoatomizdat, 1990. 544 p. (In Russian)
2. Mugalimov R.G., Kosmatov V.I., Mugalimova A.R. Mathematical description of electric drive based on an energy saving induction motor with individual compensation of reactive power. Mashinostroenie: setevoy elektronnyi nauchnyi zhurnal [Russian Internet Journal of Industrial Engineering], 2013, no. 2, pp. 78-89. (In Russian)
3. Nikiforov G.V. Energy and resource saving as the main fields of electric drive development at OJSC MMK in the market economy. Trudy IV Mezhdunarodnoy (XV Vserossiyskoy) konferentsii po avtomatizirovannomu elektroprivodu «Avtomatizirovannyi elektroprivod v XXI veke: puti razvitiya» [Papers of IV International (XV All-Russian) conference on automatic electric drive “Automatic electric drive in the XXI century: development trends”] (AEP-2004, Magnitogorsk, September 14-17, 2004). Part I. Magnitogorsk, 2004, pp. 5-8. (In Russian)
4. Onischenko G.B., Yunkov M.G. Problems and development prospects of electric drive. Trudy VIII Mezhdunarodnoy (ХIХ Vserossiyskoy) konferentsii po avtomatizirovannomu elektroprivodu AEP-2014 [Papers of VIII International (ХIХ All-Russian) conference on electric drive AEP-2014]. Vol. 1. Saransk: Publishing center of Mordoviya University, 2014, pp. 5-9. (In Russian)
5. Duyunov D.A. Induction motor with combined windings. Energosovet [Energy council], 2013, no. 2(27), pp.19-25. (In Russian)
6. Bespalov V.Ya., Kobelev A.S., Kruglikov O.V., Makarov L.N. Design and application of induction motors AED of 7AVE energy efficiency class: results and further tasks. Trudy VII Mezhdunarodnoy (ХIII Vserossiyskoy) nauchno-tekhnicheskoy konferentsii po avtomatizirovannomu elektroprivodu [Papers of International (ХIII All-Russian) scientific conference on automatic electric drive]: Ivanovo Lenin State Power University». Ivanovo, 2012, pp. 13-16. (In Russian)
7. Mugalimov R.G. Asinkhronnye dvigateli s individualnoy kompensatsiey reaktivnoy moschnosti i elektroprivody na ikh osnove [Induction motors with individual compensation of reactive power and electric drives based on them]. Magnitogorsk: Pub. Nosov Magnitogorsk State Technical University, 2011. 250 p. (In Russian)
8. Mugalimov R.G., Savitskiy A.L., Savitskaya L.D. Asinkhronnaya kompensirovannaya elektricheskaya mashina [Induction compensated electrical machine]. Patent RF, no. 2112307, 2009.
9. Mugalimov R.G. Improvement of energy efficiency of induction motors and electric drives based on them. Vestnik Magnitgorskogo gosudarstvennono tekhnicheskogo universiteta im. G.I. Nosova [Bulletin of Nosov Magnitogorsk State Technical University]. 2011, no. 1, pp. 59-63. (In Russian)
10. Mukhametshin A.I., Kornilov V.Yu. Method of control of energy characteristics of the electric drive based on an induction electric drive with combined two-layer winding. Trudy IX Mezhdunarodnoy (ХX Vserossiyskoy) nauchno-tekhnicheskoy konferentsii po avtomatizirovannomu elektroprivodu AEP-2016 [Papers of IX International (ХX All-Russian) scientific conference on automatic electric drive AEP-2016]. 2016, pp. 77–80. (In Russian)
11. Kholbaev D.Zh., Faizullaev K.M. Energy saving during introduction of induction motors with combined windings. On-line electrician: Electrical engineering. New technology, 2016. URL: https://online-electric.ru/articles.php?id=152 (In Russian)
12. Leskov I.A., Trotsenko V.M., Kalimullin A.T. Recent developments in the field of energy efficiency of induction motors. Economic design of an induction motor with combined winding. Elektronnyi nauchnyi zhurnal “Estestvennye i tekhnicheskie nauki” [Electronic scientific journal “Natural and technical sciences”]. 2015, no. 2. (In Russian)
13. Yuji О., Kazuto Sakai. Permanent Magnet Motor Capable of Changing the Number of Poles by a Factor of Three. International Conference on Electrical Machines and Systems. 2013. Busan, Korea. pp. 1122–1126.
14. William R., William Finley, Mark Hodowanec, WarrenHolter. Diagnosing motor vibration problems. Conference Record of 2000 Annual Pulp and Paper Industry Technical Conference. 2000, 19–23, pp. 165–180.
15. Bose B. Modern Power Electronics and AC Drives. Beijing, China Machine Press, 2003.
16. Hao Z., Rong-xiang Zhao, Huan Yang, Hui Cai. A Vibration Mitigation Approach for Inverter-fed Permanent Magnet Motor Drive System. IEEE SENSORS JOURNAL. 2009, pp. 2017–2022.