Special motor with 10-ton rotor for rolling mill

By stocking up in good time, plant operators can avoid costly downtime. This is particularly important for components that deviate from the standard. An Argentinian steelworks operator commissioned Menzel Elektromotoren to manufacture a special motor based on the model of its existing IM 7311 motor.

To ensure future security and because this is a considerable investment, the old, still operational drive is to be stored as a replacement. The new machine must therefore correspond exactly to it in every detail, although Menzel implemented an increase in performance at the customer's request. The medium-sized company counts special motors as part of its daily business and also designed the starter so that it is suitable for the new as well as the original motor.

The new slip ring motor delivers a nominal torque of 43245 Nm at a nominal voltage of 6600 V and a nominal output of 1345 kW. The format is unusual: with a total weight of 21.9 t, the rotor alone weighs a full 10.4 t. Numerous accessories were installed, including current transformers with HALL effect for measuring the rotor current, acceleration sensors specified by the customer on the bearings and a level sensor for the electrolyte in the starter.

The motor offers protection class IP23 and cooling type IC 01 (ventilated). It must withstand ambient temperatures of up to 45 °C in the steelworks. Before delivery, the motor underwent a complete type test with additional tests according to customer specifications, including partial discharge and loss factor measurement (tan δ). Menzel also takes care of commissioning the roller drive, which is scheduled by the operator according to the production planning.