Speed Control of BLDC Motor by Using Tuned Linear Quadratic Regulator

Brushless Direct Current motors are one of the motor types rapidly gaining popularity. The major problem in BLDC drive system is that some disturbances are originated in the drive which will results in errors and reduces the stability of the system. Conventional controller is used to control the speed of the motor, but the response of the system is affected by steady state error and represents a poor transient reponse.To regulate the speed of the motor at desired speed is an important application in automotive industries. So we use a Linear Quadratic Regulator controller to regulate the speed and position of the motor. The state variables and control variables of the BLDC drive system are synthesized in this paper. The main objective of this paper is to formulate the control law which results in minimum performance index. This paper spotlights both the design and simulation of optimal control systems for BLDC motor drive system. This optimal design will reduce the burden of tedious computations in control engineers. This optimal design helps to realize the BLDC system with practical components which will provide the desired operating performance.