Case story: Conveyor systems

Infinitely variable DC motors are required to drive heavy-load transport vehicle used to transport casting ladle weighing up to 100 tons. The motors are powered by a 48-V battery and connected to a gearbox to provide a travelling speed of 10 m/min. They must be able to provide full torque across the entire speed range whilst also being able to cope with a shortterm, 3-fold overload. The vehicles are equipped with a battery (capacity 625 Ah) to provide a minimum travelling time of 200 minutes, which is calculated for 20 journeys per shift. The motor output is to be dimensioned accordingly.

For this application Johannes Huebner Giessen supplied 2 separately excited, low-voltage, shunt-wound DC motors with an integrated spring-loaded brake of series GN 17 series for each vehicle. The motors are equipped with an additional fan to cool the outer surface and are designed for intermittent operation (S3 42% CDF). The rated motor torque is 17 Nm. For a short period the motors can be subjected to an overload of 50 Nm. A BAMOBIL power supply to power the DC shunt-wound motor is included in the Huebner Giessen scope of supply.