Close Loop Speed Response of BLDC Motor using PI Controller

Permanent magnet brushless DC motors (PMBLDC) find wide applications in industries due to their high power density and ease of control. These motors are generally controlled using a three phase power semiconductor bridge. For starting and the providing proper commutation sequence to turn on the power devices in the inverter bridge the rotor position sensors required. Based on the rotor position, the power devices are commutated sequentially every 60 degrees. To achieve desired level of performance the motor requires suitable speed controllers. Brushless dc (BLDC) motor drives are continually gaining popularity in motion control applications. Therefore, it is necessary to have a low cost, but effective BLDC motor speed/torque regulator. They are used in Residential and commercial appliances such as refrigerators and air conditioning systems with conventional motor drive technology. A Brushless DC (BLDC) drives are known for higher efficiency and lower maintenance. This paper presents a “Modelling and performance analysis of PID controlled BLDC motor and different schemes of PWM controlled BLDC motor�. This paper presents simple open loop response of speed, torque, stator current, back emf and verified the operation of BLDC motor.