Electric Motor Efficiency
Electrical motor efficiency is the ratio between shaft output power - and electrical input power.
IEC STANDARDS FOR ELECTRIC MOTORS
The International Electrotechnical Commission (IEC) standards are the uniform standards indicating the efficiency classes for electric motors. In 1999, the European Commission established different efficiency classes for electric motors. They did this to reduce energy consumption and to create awareness of the importance of a more sustainable environment among various industries. These efficiency classes were called the EFF standards. However, the US established the NEMA standards for electric motors, which differed a lot from the EU standards. To overcome the international inconsistencies in regulations, the EFF standards changed to the current IEC standards for electric motors.