18.03.2010 | Editor: Marcel Dröttboom
With the Flender EMPP vertical mill drive the Siemens drive technologies division has developed a drive concept that prevents load surges arising from short power supply interruptions and optimizes the transfer of forces between the drive and the mill.
At the same time the number of components that may be susceptible to faults is reduced. The new vertical mill drive enables applications involving power ratings from 500 kW to 15 MW to be operated with high plant availability. This is made possible by an integral, permanent-magnet synchronous motor supplied by a frequency converter. The omission of the bevel gear stage and the coupling enables the high forces to be optimally transferred, with the result that less complex components are required, which increases the efficiency of the mechanical system. The grinding plate can be precisely controlled via the closed-loop speed control of the frequency converter. This means that although different grinding materials are involved, the grinding process becomes more even and can be optimized locally. Load surges resulting from short interruptions in the power supply are avoided by means of the electrical decoupling of the drive system, thus ruling out damage to the mechanical components. Rotary oscillations excited by the grinding process can be actively dampened via the drive. As it is often difficult to transport large components, from a certain size the EMPP drive can be delivered in two parts and assembled on site. The mill drive meets the requirements of the Atex Directive that is of particular importance for coal mills with flammable coal dust.
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