The project was to replace two DC motors with AC ones on an extrusion process. The existing motor and drive were from the 1970’s with the existing drive being old style analogue electronics. Both motor and drive had become difficult to maintain with the electronics subject to contamination and age-related degeneration of components. 

Technique approach was to take the upgrade from first principles and calcutle the portional torque supplied by the existing motors and then asses which motor from the Siemens range fitted that application best. What we found was that the process’ requirements could be met with a standard 4 pole squirrel-cage motor which was a small enough to be directly mounted on the machines drive shaft.