Do energy efficient motors suffer a loss in efficiency when they are repaired?
Not necessarily. Efficiency losses can occur in either standard or energy efficient motors when poor quality control is observed. The core can be damaged by excess heat during winding removal. Any deviation from original wire gage and winding pattern generally increases losses. Machine work that alters original clearance and tolerance, and substitution of nonequivalent parts such as sealed bearings for shielded bearings can also reduce efficiency. Standard and energy efficient motors have comparable susceptibility to these offenses.
