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MACHINERY LUBRICATION
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MACHINERY LUBRICATION Volume 18 - Issue 6 November-December
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An increase in electric-motor temperature of 10 degrees C will cut motor life in half.
Motor bearings typically should run less than 160 degrees F (71 degrees C). Often,
hot-running motor bearings are associated with overgreasing. Conditions that might be
observed include the following:
• Grease leaks onto stator and into rotor windings.
• Grease on windings creates a thermal barrier from the cooling air. is increases the
motor temperature.
• Dirt and grime adhere to the grease that enters the windings, causing thermal problems.
• Excess grease in the bearing core results in churning, heat, grease failure and bearing failure.
• High bearing temperature can lead to the inner race slipping on the shaft followed by
misalignment. is misalignment causes the stator and rotor winding to make contact and
short out.
Hot-running Motor Bearings
