What are the motor efficiency standards and classes?

Motor efficiency standards define minimum efficiency levels. IEC 60034-30-1 establishes classes: IE1 (Standard), IE2 (High), IE3 (Premium), IE4 (Super-Premium), and IE5 (Ultra-Premium). NEMA MG1 uses similar classes. Higher efficiency means lower losses, reduced operating cost, and environmental benefit. Regulations in many countries mandate minimum efficiency (typically IE3 for new motors). High-efficiency motors cost more initially but provide payback through energy savings, often within 1-3 years for continuously running motors.