Page 151 - Electrical Equipment Handbook _ Troubleshooting and Maintenance
P. 151
MAINTENANCE OF MOTORS
8.6 CHAPTER EIGHT
FIGURE 8.1 Typical winding insulation construction.
The motor temperature rise is the difference between the ambient temperature and the
average winding temperature. The hot-spot allowance is the difference between the average
winding temperature and the hottest spot in the windings.
FAILURES IN THREE-PHASE STATOR WINDINGS
The appendix at the end of this chapter illustrates 12 different failures in three-phase stator
windings.
PREDICTIVE MAINTENANCE
Predictive maintenance requires the establishment of trends to monitor for vibration, tem-
peratures, and oil contamination (wear particles) to identify potential problems. Predictive
maintenance improves the performance of the motor and reduces the failure rate. This
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