brushless dc motor by removing physical carbon brush, prolong the service life of the motor, reduce the motor noise and friction in the process of operation, to avoid the carbon brush motor in the process of operation which sparks brought to production safety hidden trouble, but also effectively reduce the volume of the machine. But also because of cancelled physics, carbon brush, brushless motor can only be realized by brushless drive a digital signals, thus turning.
the brushless dc motor control mode of what? Underneath explain to everyone.
the brushless dc motor control, there are three main types: with position sensor and no position sensor and intelligent control.
one, with position sensor control (Hall sensor)
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. Motor position sensor is used in the electromagnetic (Such as magnetic resistance rotating transformer), photoelectric (If the mask), magnetic susceptibility (Such as hall sensor)Etc. , one of the most widely used with position sensor control system is we often contact with hall sensor.
2, sensorless control
brushless dc motor without position sensor control, not directly on the 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.
3, intelligent control,
control theory of intelligent control is the advanced stage of development, 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, BLDCM is a 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.
the above three is the current way of brushless dc motor control, the most common is the first position sensor control mode, the hall sensor, dongguan within the rotor brushless motor, low cost, high reliability, the localization is accurate, mass production and use of brushless dc motor is one of the best way to control.
