21st Century electric motors are replacing existing AC DC System
Brush less Direct Current (BLDC) motors are rapidly gaining popularity. BLDC motors are used in industries such as Appliances, Automotive, Aerospace, Consumer goods, Medical, Industrial Automation Equipment and Instrumentation. As the name implies, BLDC motors do not use brushes for commutation, instead, they are electronically commutated. BLDC / AC SERVO MOTORS have many advantages over brushed DC motors and induction motors.
A few of these are
Better speed versus torque characteristics
Higher dynamics response
Long operating life
Higher speed ranges