Excessive grease and oil creates dirt and can damage bearings. Lubrication Lubricate the bearings only when scheduled or if they are noisy or running hot. In wet wet or or cor corrrosi osive envi enviro ronm nmen entts, open open the cond condui uitt box box and and che check ck for deteriorating insulation or corroded terminals. Schedule the removal of the motor from service for complete inspection and possible rebuilding. Ser Serio ious us corr corros osio ion n may may indi indica cate te inte intern rnal al deterioration and/or a need for external repainting. Chec Check k for for sign signss of of cor corro rosi sion on. If the the flo flow w is is wea weak k or unsteady, internal air passages are probably clogged. Feel Feel for for air air bein being g dis disch char arge ged d fro from m the the cool coolin ing g air air port ports. He at reduces insulation life and eventually causes motor failure. Dirty motors run hot when thick dirt insulates insulates the frame and clogged passages reduce cooling air flow. Wipe, ipe, brus brush, h, vacu vacuum um or blow blow accu accumu mullated ated dir dirt fr from the fram rame and and air air passages of the motor. It involves the following factors:ĭirt and Corrosion 1. The routine inspection and servicing can generally be done without disconnecting or disassembling the motor. From such records, specific problems in each application can be identified and solved routinely to avoid breakdowns and production losses. Written records indicating date, items inspected, service performed and motor condition are important to an effective routine maintenance program. A motor may require require additional or more frequent attention if a breakdown would cause c ause health or safety problems, severe loss of production, damage to expensive equipment or other serious losses. Including the motors in the maintenance schedule for the driven machine or general ge neral plant equipment is usually sufficient.
The frequency of routine service varies widely between applications. Introduction The key to minimizing motor problems is scheduled routine inspection and service. Got to love slow HP.Maintenance and Troubleshooting of Electric Motors CHAPTER 1 - Motor Maintenance SCHEDULED ROUTINE CARE It only took two men a month to repair and what fun to watch the test run. He loved every minute making all drawings for the connections. One of our retirees came in and re engineered what the connections should be.
The customer figured it was spinning at a couple thousand rpm before copper started flying out. The brake had failed and dropped the load down a 800' deep mine shaft. All the connections on the stator windings had been wiped out when the motor over spun rpm. The motor was only about 250hp at 200rpm. The rotor coils (windings) were the size of Harley jugs mounted on the shaft (rotor).
One of my favorite motors that came in was about 8' tall and 1' deep winding (stator). I do wish I'd had taken pictures back then. We worked on everything from locomotive traction motors to small DC motors. I don't miss the stress of trying to get customers motor repaired in a timely manner. A factory can kick out a motor winding in minutes when making hundreds. Just to rewind a simple 3 phase motor with no machine work was $300. I had work at a motor rewind shop in the 90's.
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