It’s not uncommon for many of our customers to have a backup electric motor in storage to maintain productivity in the event of a motor failure. However, if the electric motor is stored properly, it may not be reliable when its needed.  Here are few tips that might help:

  • Store It Indoors.  It’s not always an option due to size or length of storage, but storing your motor indoors is highly recommended because it can help eliminate moisture and exposure to extreme temperatures.  Even when stored indoors, it’s best to have the motor in a climate-controlled area to prevent condensation.  
  • Apply Rust/Corrosion Inhibitor.  Any exposed machined surfaces and sleeve bearings should be coated during any storage period.  
  • Grease Bearings.  When storing for longer periods of time, completely fill the bearing cavities with grease.
  • Create A Motor Storage Tag.  Add a tag to the motor is storage with rotation details.
  • Add Oil.  Oil-lubricated motors should have just enough oil to cover the bearings (note – you should never move a motor with oil in the reservoir).
  • Avoid Any Ambient Vibration.  Vibration can damage motors, even when they are in storage.  
  • Rotate The Shaft.  Turn the motor shaft about once a month, and make a note of the rotation on the motor storage tag.
  • Take Care Of the Motor Windings. Keep windings clean and dry.
  • Test IR.  Test the insulation resistance of the windings before storing the motor, and again before putting it into service.   For coil windings also consider a PI test in addition to the IR test.  Make a note of the readings on the motor storage tag.
  • Carbon Brushes.  When storing long-term, lift the brushes away from the commutator/slip rings to prevent photographing.    If practical, store the springs in a relaxed state to prevent a loss of spring pressure.  

Even with small electric motors, a few precautions like these can prevent expensive failures, and keep your motor reliable and ready for service.

If you have any questions or need specific technical advice, please contact Priest Electric online or call 1.208.459.6351