Brushless dc motor control method has the following three: One, with position sensor control With position sensor control is installed on the brushless dc motor stator position sensor to detect the rotor position and control of the stator winding commutation. Position sensor is used in the electromagnetic type (such as magnetic resistance resolver), photoelectric (such as screen), magnetic susceptibility (such as hall sensor), in which hall sensor is the most widely used. Second, the sensorless control Sensorless brushless dc motor control method, not directly on brushless dc motor stator installation position sensors to detect the rotor position. It usually use direct against potential detection, potential three harmonic method, the current path monitoring method, open circuit voltage method, the phase inductance method, the potential logic level methods such as integral comparison method to indirectly detect the rotor position. Third, intelligent control Intelligent control is the advanced stage of development of control theory, generally includes fuzzy control, neural network control, expert system, etc. Intelligent control system has the function such as self-learning, adaptive, self-organizing, able to solve the problem of model uncertainty, nonlinear control, and other more complex problems. Strictly speaking, BLDC is a motors object of multi-variable, nonlinear, strong coupling, so use intelligent control can achieve satisfactory control result. At present, there have been many more mature intelligent control methods applied in brushless dc motor control, for example: the combination of Fuzzy control and PID control Fuzzy - PID control, Fuzzy control and neural network with the combination of compound control and the parameters of the membership degree by the genetic algorithm to optimize the Fuzzy control and single neuron adaptive control, etc.
