Symptom: Overheating of Motor

Clean and dry motor; inspect air vents and windings periodically.

Check application, measuring voltage and current under normal running conditions.

Compare values on motor nameplate with those of mains supply. Also check voltage at motor terminals under full load.

Check stator resistance at all three phases for balance.

Exchange motor for another that meets needs.

Check bearing wear and shaft curvature

Perform dielectric test and repair as required.

Check for unbalanced voltages or operation under single-phase condition.

If recently wired, check proper termination, clearance, mechanical strength and electrical continuity. Refer to motor lead connection diagram.