Improvement of the electric drive of ball mills of ore processing plants by using pole - changing asynchronous motors

Relevance. Currently, in developed countries, research is being conducted to study the issue of increasing the efficiency of production and automation of the technological process, as well as the introduction of new technologies into production. Based on this, special attention is paid to the creation of new energy- and resource-saving electric drives that make it possible to increase the service life of active parts of mechanisms by facilitating the start-up process and simplifying the technological process by ensuring precise stopping of high-inertia grinding mechanisms. In this direction, one of the priority tasks in this field is the development of adjustable electric drives based on multi-speed motors that meet the operational requirements of grinding mechanisms. Along with this, an important task is the development of new pole-changing winding schemes with improved electromagnetic properties and simple manufacturing technology used in multi-speed motors. Aim. To improve the electric drive of ball mills for rock grinding through the application of multi-speed electric motors with pole-changing windings. Methods. Method of discretely specified spatial functions based on formalized logic, along with methods of vector and harmonic analysis, the theories of linear algebra and electrical machines, the graph-analytical method for constructing magnetizing force diagrams and Fourier series decomposition, as well as experimental investigations of the static and mechanical characteristics of electrical machines. Results. In accordance with the operational requirements of ball mill electric drives, a novel pole-changing winding scheme for a two-speed induction motor was developed. The developed design was patented in the Republic of Uzbekistan. Based on the proposed scheme, a prototype of the new two-speed motor was designed, manufactured, and subjected to industrial testing. The obtained electrical and mechanical performance characteristics demonstrated full compliance with the technical specifications required for ball mill drives. The newly developed two-speed asynchronous motor was subsequently implemented in the electric drive of an МSh-1 type ball mill, installed in the 35th workshop of the Research and Production Association for Rare Metals and Hard Alloys at Almalyk Mining and Metallurgical Complex JSC. The achieved annual economic effect amounted to 13200 conventional units. For citation: Bobojanov M.K., Rismukhamedov D.A., Tuychiev F.N., Shamsutdinov Kh.F. Improvement of the electric drive of ball mills of ore processing plants by using pole-changing asynchronous motors. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 35-43. https://doi.org/10.18799/24131830/2026/6/5331

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