New vertical mill drive solves surge problems and improves reliability

Siemens Industry Drive Technologies Division has launched a new Flender vertical mill drive that prevents load surges arising from short term power interruptions and optimises performance between drive and mill, enabling power ranges to be expanded to 15MW.

Reliability is also enhanced through a reduction in the number of components susceptible to faults. The EMPP (electrical motor and two planetary gears) vertical mill drive is an innovative drive concept, featuring a newly developed motor in which the gear housing is built in under the planetary gear.

The power transmission features a permanent magnet synchronous motor with a highly efficient cooling system, and the drive is controlled by a frequency converter. This ensures maximum running smoothness combined with optimum grinding results for varying operating conditions. Vertical mills are commonly used to crush raw material and cement in the building materials or coal industries and trends are towards larger production facilities. The new units are available in power ratings from 500 kW to 15MW, and above a certain size, units can be delivered in two parts and assembled on site. The footprint of the new drive means that no laborious retrofitting is necessary.

This new mill drive meets the requirements of the ATEX Directive – of particular importance for coal mills with flammable coal dust. The Siemens Drive Technologies Division is the world’s leading supplier of products and services for production machinery and machine tools. Integrated technologies along the entire drive train combining electrical and mechanical components offer the highest potential to reduce energy consumption in industrial plants.

More information on the Flender range of gear units is available from Siemens Industry on 01274 657700, by emailing anna.grimshaw@siemens.com or see the new drive on the Siemens website at www.siemens.com/flenderempp
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PHOTO-CAPTION: The new Flender vertical mill drive for larger applications
This photo can also be downloaded from the internet at www.siemens.com/ad-picture/2313

For further media information please contact Bridget Summers, Footprint, PO Box 4, Thorpe Park, Leeds LS15 8WX. Tel: 0113 251 5697. Fax: 0113 251 5351. E-mail: bridget@fim.org.uk