Particularities Regarding Design of Asynchronous Motors used for Driving Coal Mills

The motors used for driving coal mills in a steam power plant use a lot of active and reactive electrical energy, so they work with high exploitation costs. Reducing the exploitation costs is a very difficult problem, even if we use performant computers, because heavy working conditions (load shocks, high temperatures etc.) and restrictive requirements imposed by this drive must be taken into account. By using this information, it is possible to carry out an optimal design of asynchronous motors used in coal mills. The design uses mathematical models which take into account the magnetic saturation, as well as the current pressing effect, thus obtaining valuable results within a range of admissible and practical errors. The optimization is justified by reducing the exploitation cost of a motor with 34800 € as against the existing variant and by presenting the simulated operation characteristics of the motor obtained.