A Review on: PID Controller

Abstract

Brushless DC (BLDC) motors are preferred as small horsepower control motors due to their high efficiency, silent operation, compact form, reliability, and low maintenance. BLDC motor uses electronic commutation instead of mechanical commutation to control the power distribution to the motor. Latching Hall-effect sensors, mounted in the motor, are used to measure the motor?s position, which is communicated to the electronic controller to spin the motor at the right time and right orientation. Commutation informs that rotor rotation of BLDC motor is proper or not, while the speed of motor depends on the value of applied voltage. Commutation using electronics instead of brushes provides greater flexibility and capabilities includes speed limiting, ?micro stepped? operation for slow and fine motion control, and a torque when stationary. The applied voltage can be controlled by using the Pulse Width Modulation (PWM) technique. The required speed is controlled by PID controller.