چكيده به لاتين
This paper concerns the fault tolerant control of brushless direct current motors against the failure of 1, 2 or 3 hall effect sensors. In important applications such as the spacecraft and the military industry that the motor stop can bring a lot of human and financial losses, the proposed idea in this paper will be very beneficial. In this idea, the motor starts up with sensor-based method. Because this method has important advantages, including high Accuracy and big torque, and this is why, in important applications, it is usually used as a driving method. In case of hall effect sensors failure that are responsible for determining the position of the rotor, switching to the sensor less driving method is done, so that with a failure of 1, 2 or 3 hall effect sensors, the motor can Continue rotate itself. The proposed sensor less driving method is based on the zero crossing points detection of the back electromotive force in open phase. A PID-Fuzzy controller has been used to improve the motor behavior, when the speed decreases due to switching to sensorless driving mode. Because the PID controller is the most widely used controller in the industry and the fuzzy controller is also combined with the PID controller due to the need for online adjustment of the coefficients. The simulation results based on the proposed method of this paper show the efficiency of the suggested idea.
