Brushless DC motor control is divided into three types: with position sensor, without position sensor and intelligent control.
1. Position sensor control
Position sensor control is to install a position sensor on the stator of the
bldc gear motor to detect the position of the rotor and control the commutation of the stator winding. The position sensors used include electromagnetic type (such as magnetoresistive resolver), photoelectric type (such as shading plate), magnetic sensitive type (such as Hall sensor), etc., among which Hall sensors are widely used.
2. No position sensor 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. Generally, methods such as 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 are used to indirectly detect the position of the rotor.
3. Intelligent control
Intelligent control is the development stage of control theory, which generally includes fuzzy control, neural network control, expert system, etc. The intelligent control system has functions such as self-learning, self-adaptation, and self-organization, which can solve more complicated problems such as model uncertainty and nonlinear control. Strictly speaking, BLDCM is a multi-variable, non-linear, and strongly coupled object, so using intelligent control can achieve a more satisfactory control effect. At present, many mature intelligent control methods have been applied to the control of brushless DC motors, such as: fuzzy-PID control combined with fuzzy control and PID control, compound control combined with fuzzy control and neural network, membership parameter inheritance algorithm optimization fuzzy control , Single neuron adaptive control, etc.
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