BESPOKE MOTOR WITH 10-TON ROTOR FOR STEEL MILL
Since this is a considerable investment, the old, still operational motor will be stored as a backup for future-proofing.
The new machine must replicate the motor it is replacing in every detail, although Menzel implemented a performance increase at the customer’s request. The German family-run company counts special motors among its core business and also designed the starter so that it caters equally for the new motor and the original one. The new slip ring motor provides a nominal torque of 43,245Nm at 6600V rated voltage and 1345kW rated power. The format is unusual: at a total weight of 21.9 tons, the rotor alone weighs 10.4 tons. Various accessories were installed, including hall effect current transformers to measure the rotor current, customer-specified accelerometers on the bearings, and a level sensor for the electrolyte in the starter. The motor features IP23 protection and IC 01 cooling (open-circuit ventilation). It has to withstand ambient temperatures up to 45°C in the rolling mill. Before shipping, the motor underwent a complete type test with additional tests according to customer specifications, including partial discharge and dissipation factor measurement. Menzel will also handle the mill drive commissioning, which the operator will schedule to suit production planning.
By provisioning in good time, plant operators can avoid costly downtimes. This is all the more important for non standard configurations.
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