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Procedure helps remove uncertainty from drying time for windings

  • August 1999
  • Number of views: 173
  • Article rating: No rating

Chuck Yung 
EASA Technical Support Specialist 

We've all faced those rush jobs, where a cus­tomer is desperate to get his motor back faster than humanly possible. It is our nature to try to do the impossible that's why we are in this business.

We enjoy a challenge and the opportunity to help people. Turning a motor around quickly, when a customer is in need, is rewarding. One of the most time-consuming steps drying the windings after they have been cleaned Ð can be frustratingly slow when an anxious customer is calling. How long does that motor need to bake to be safe? 

Most service centers have built in a safety factor, based on some long-forgotten problem we had (or heard about) with a winding that was not properly dried. "Joe" opened the oven door right before lunch and left it open, then someone pulled a stator out a couple of hours later and it megged low. Maybe it failed on the test panel. Of course, "Joe" didn't fess up to what happened.  So you told everyone: "From now on, all windings bake 2 hours longer than we used to."

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