Menzel Elektromotoren has custom-built a mill motor with a short-circuiting and brush-lifting device

The motor with 710 mm shaft height and 2000 kW rated power operating at 4200 V will replace an older machine of different make for a ball mill in a cement plant.

Menzel Elektromotoren has configured a slip ring motor with a short-circuiting and brush-lifting device for a cement mill.

At the customer's request, Menzel replicated the features of the original machine, including a brush-lifting device, for which Menzel implemented a modern, reliable design. Few motor manufacturers have brush lifting in their portfolios currently. However, the family-run German company Menzel offers a full service for motors with brush lifting, from consultation to motor design and production, testing and commissioning, everything from a single source.

The brush-lifting device reduces wear and tear on the motor brushes and is economically viable in applications with very long run times and very infrequent starts. After motor ramp-up, the rotor windings are short-circuited and the carbon brushes lifted. This eliminates the cost and effort required for regular brush replacement. In addition, since brush abrasion is reduced and significantly less carbon dust is released, the slip ring compartment, slip rings and filters can be cleaned much less frequently.

The cement plant operator required a speedy and smooth changeover. The MEBSSL-type three-phase slip ring motor is configured to replace the existing motor one-to-one. It features protection class IP 55, insulation class H and cooling type IC 611 (air-to-air heat exchanger). Designing the machine and selecting the most suitable carbon brushes, Menzel also took into account the installation height at 2600 m AMSL.

More mill motor references: https://www.menzel-motors.com/mill-drive/

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