Sensorless Control of a Brushless DC Motor
نویسنده
چکیده
This paper uses a new position sensor less drive for brushless DC (BLDC) motors. In conventional sensor less control methods such as the back-EMF detection method, the performance is high only at a high speed range due to the fact that the magnitude of the back-EMF is dependent on the rotor speed. A solution is derived that estimates the rotor position by using an unknown input observer over a full speed range. This sensor less control technique is modelled and simulated using MATLAB/SIMULINK and the outputs verify that a high performance is obtained at a low speed range as well and the information of a rotor position is calculated independently of the rotor speed without an additional circuit or a complicated operation process. Keywords—BLDC motor; sensor less motor control; unknown input observer.
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