Control method of brushless DC motor
Date：2024-10-16 Author：XINDA MOTOR
There are three types of control for brushless DC motors: with position sensor, without position sensor, and intelligent control.
1. Control with position sensor Control
with position sensor is to install a position sensor on the stator of the brushless DC motor to detect the rotor position and control the stator winding commutation. The position sensors used are electromagnetic (such as reluctance rotary transformer), photoelectric (such as shading plate), magnetic sensitive (such as Hall sensor), etc., among which Hall sensor is the most widely used.
2. Position sensorless control
The position sensorless DC brushless motor control method does not directly install a position sensor on the stator of the DC brushless motor to detect the rotor position. It generally uses direct back-EMF detection, back-EMF third harmonic method, current path monitoring method, open-circuit phase voltage detection method, phase inductance method, back-EMF logic level integral comparison method and other methods to indirectly detect the rotor position.
3. Intelligent Control
Intelligent control is an advanced stage of the development of control theory, generally including fuzzy control, neural network control, expert system, etc. Intelligent control systems have functions such as self-learning, self-adaptation, and self-organization, and can solve model uncertainty problems, nonlinear control problems, and other more complex problems. Strictly speaking, BLDC is a multivariable, nonlinear, and strongly coupled object, so using intelligent control can achieve more satisfactory control results. At present, many relatively mature intelligent control methods have been applied to brushless DC motor control, such as: Fuzzy-PID control combining fuzzy control and PID control, composite control combining fuzzy control and neural network, fuzzy control with membership parameters optimized by genetic algorithm, single neuron adaptive control, etc.
XINDA