6-MW high-voltage extruder motor speedily adapted

When large motors operating at high output fail, a replacement manufactured from scratch can hardly be the solution because of the long lead times and the resultant loss of production.

An off-the-shelf slip ring motor, adapted to fit the application at short notice, enabled the petrochemical company to restart its extruder plant as soon as possible

Instead, customized configuration of a suitable standard motor is an economical alternative. A case in point: a petrochemical plant operator urgently needed to replace a failed extruder motor featuring 6000 kW rated power, 10 kV nominal voltage, requiring >57 kNm nominal torque. Originally, the extruder was driven by a squirrel-cage machine. However, a motor with similar design parameters was not readily available on the market. Fortunately, Menzel Elektromotoren based in Berlin, Germany, was able to offer a suitable three-phase slip ring motor. This design also offered significant advantages for the target application, driving an extruder, as it provides the required full torque from standstill.

Menzel could quickly procure a starter for the slip ring motor as well as implement all necessary modifications in-house. Thanks to a delivery time of only two weeks, the customer restarted the extruder system at the earliest possible moment. The modular MEBSSL motor series is explicitly designed to enable flexible configuration for various applications and conditions. One of the most time-consuming jobs was fitting a bushing in the customer’s coupling hub, machining it from a diameter of 280 mm to 240 mm. In addition, Menzel manufactured adapter plates for the motor to adjust the shaft height from 800 mm to the failed motor center height of 900 mm. The replacement motor is designed with protection class IP55 and cooling type IC 611 with an air-to-air heat exchanger.

www.menzel-motors.com

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