BRUSHLESS DC MOTOR (BLDC) SPEED CONTROL WITH HARMONIC INJECTION METHOD

Nowadays, brushless direct current motors (BLDC) are often preferred (used) in home appliances, computer systems, medical electronics, space technology, military applications, robotics systems, etc. BLDC motors are frequently used in applications since they have features such as high momentum, efficiency, long lifetime, and precise speed control. BLDC motors working principle is similar with brushed DC motors working characteristic. Since the permanent magnets in the rotor of the BLDC motors provide excitation, there is no need for brush and collector assemblies. Besides to these positive features, an additional power electronic circuit is necessary to control motor; and in order to get the position information to maintain commutation an additional position sensor is required. It is known that the fluctuation in the torque is excessive due to the current ripple when the speed control of the BLDC motor is performed. In this study, it is aimed to perform speed control of BLDC motor with harmonic injection method in order to reduce torque ripple. The mathematical model of the BLDC engine has been created in MATLAB/Simulink in order to make the simulation of control