In these days of manufacturing facilities’ quest to become more efficient, many users are looking to either specify or retrofit motors with the highest available efficiency class.
Currently, European legislation (IEC 60034-30-1) dictates that for motors used in safe areas, efficiency class IE3 must be used for fixed speed applications, whereas IE2 is permitted for use with variable speed drives.
For motors used in hazardous areas i.e. Zones 1 & 2, a motor with any efficiency class is permitted, therefore motors with comparatively lower efficiencies (IE1) are allowed.
The higher the IE number, the higher the motor efficiency:
The aspirations to have the highest possible motor efficiency are all very well, but, as usual with industrial equipment, there is more to this than meets the eye!
To ensure a proper and meaningful evaluation is carried out by users, the following must be considered: