| Background:
A customer in central Ohio uses a centrifuge to spin oil out of metal shavings generated from the production of threaded material prior to sending the shavings for recycling. If the oil is not removed from the shavings, the recycler will not accept them. In normal production day, this company produces a tractor trailer full of shavings.
The company has two centrifuges run by NEMA Class D motors. Centrifuges are a high inertial application that historically required the use of NEMA Class D motors. A Class D motor offers a high initial starting torque to be able to start the large inertial load a centrifuge represents.
Problems occurred with the motor on centrifuge #1. The delivery on a new Class D motor was many weeks, and local motor repair shops could not repair the motor for at least 5 days.
CMC's Solution:
Calculating the torque the NEMA D motor was delivering at start up, and taking advantage of the capability of the ACtionMaster S5 vector drive being able to control a NEMA B design motor to produce 200% torque at start, CMC was able to assist the customer and use a standard off the shelf motor and S5 drive. An additional benefit is the centrifuge now starts and stops much smoother than before, resulting in less mechanical stress on the system.
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