Special motor with 10-ton rotor for steel mill
An Argentinian steel mill operator commissioned Menzel Elektromotoren to build a special motor based on an existing motor with the type of construction IM 7311.
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By provisioning in good time, plant operators can avoid costly downtimes. This is all the more important for non-standard configurations.
For future-proofing and since this is a considerable investment, the old, still operational motor is to be stored as backup. Therefore, the new machine must replicate it 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 in such a way that it caters for the new motor and the original one equally. The new slip ring motor provides a nominal torque of 43245 Nm at 6600 V rated voltage and 1345 kW rated power. The format is unusual: at a total weight of 21.9 tons, the rotor alone weighs full 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 (tan δ). Menzel will also handle the mill drive commissioning, which the operator will schedule to suit production planning.
www.menzel-motors.com
