brushless dc motor after revocation of physical carbon brush, useful to prolong the life of the use of the motor, reduce the motor noise and conflict in the process of operation, to avoid the carbon brush motor in the process of operation which sparks brought to production safety hidden trouble, together is also useful to cut the size of the machine. But also because of the revocation of the carbon brush physical turned, and only after a brushless brushless motor drives a digital signals can finish turned, and rolling.
so what are the control method of brushless dc motor? The following is for everyone to explain this.
dongguan control method of brushless dc motor there are three primary: with position sensor and no position sensors and intelligent control.
one, with position sensor control (Hall sensor)
with position sensor control is on the brushless dc motor stator device position sensors to detect the rotor position and manipulation of the stator winding commutation. The azimuth sensor has electromagnetic (Such as magnetic resistance rotating transformer), photoelectric (If the mask), magnetic susceptibility (Such as hall sensor)Etc. , during which the most extensively used with position sensor control system is we often touch the hall sensor.
2, without position sensor control
brushless dc motor without position sensor control, not directly on the stator of brushless dc motor position sensors to detect the rotor position. It usually use direct against potential detection, potential three phase voltage harmonic method, the current path surveillance, open phase method, inductive method, the back emf logic level methods such as integral comparison method to directly detect the rotor position.
3, intelligent control
intelligent control is to develop the advanced stage of control theory, general and ambiguous control, neural network control, expert system, etc. Intelligent control system has a self learning and adaptive, self-organizing, and other functions, can deal with model uncertainty problem, the nonlinear control problem and other more clutter. Strictly speaking, BLDCM is a multi-variable, nonlinear, strong coupling, so using intelligent control can achieve satisfactory control results. At present, there have been many more sophisticated intelligent control methods applied in brushless dc motor control, for example: vague control and PID control with the combination of Fuzzy -Neural network PID control, vague control and compound control, the subordinate degree of parameters by the genetic algorithm to optimize the vague control, single neuron adaptive control, etc.
the above three is the present stage of dongguan eppo uavs primary motor manufacturer control method, the most common is the first band position sensor control methods, namely the hall sensor, low cost, high reliability, positioning is accurate, mass production and use of brushless dc motor is one of the best control method.
