Mill Drives

For electric motors, mills count amongst the most complex machines in the industry. The heavy starting alone makes the start-up of an electrical machine noticeable. In addition to this, there are also frequent ignitions and unwanted vibrations. A ball mill, which already has a high moment of inertia in itself, is filled with limestone in cement plants - or coal in thermal power plants - upon start-up, making it more difficult to start the engine. Our tube-cooled U series is specially designed for heavy starting. The machines with squirrel cage rotors are very well suited for operation on the converter and are calculated for frequent ignitions by our engineers using special winding systems. The slip ring rotor version allows for an additional increase in starting torque. Machines from the A series in versions with air-to-air or air-to-water heat exchangers are well suited for vertical coal mills in coal-fired power plants. The special design of the engine can easily absorb the vibration of the mill while still remaining fully functional. The operating point and start-up ability determine the characteristics of the mill. Our drives are used in cement, coal and paper mills, amongst others.