The early control strategies can no longer meet the needs of the current system. The manufactured PID controller has the advantages of simple structure, strong robustness, and high reliability, but it cannot effectively deal with the uncertain information in the system. The proportional, integral and derivative of the deviation are linearly combined to form the control quantity, and the controlled object control. Vector control: Vector control is the theoretical basis of modern motor high-performance control, which can improve the torque control performance of the motor.

Fuzzy control: Fuzzy control is a method of implementing system control based on the fuzzy model of the controlled object, using the approximate reasoning of the fuzzy controller and other means. It is the output signal tracking the reference signal, but these control algorithms are heavily dependent on the motor model parameters Its main advantages are easy implementation and fast adaptation speed, which can effectively overcome the influence caused by the slow change of the motor model parameters.

Fuzzy logic control and neural network control are mature in application. In order to improve the accuracy and reliability of the stepper motor system, the stepper motor control strategy is launched Research. Accuracy, strong robustness and adaptability. Neural network control: using a large number of neurons to adjust according to a certain topology and learning, can fully approximate arbitrarily complex nonlinear systems, can learn and adapt to unknown or uncertain systems, and has strong robustness and Fault tolerance. The system is advanced angle control, no mathematical model is required for design, and the speed response time is short.

PID control: it composes the control deviation e(t) according to the given value r(t) and the actual output value c(t). It has been verified that the control method has good dynamic response characteristics. With the complexity Air Conditioner fan motor Manufacturers of the control object, when the dynamic characteristics are unknown or unpredictable changes, in order to obtain a high-performance controller, a globally stable adaptive control algorithm is derived based on the linear or approximately linear model of the stepper motor.

The four broadest directions are described below: With the development of society, the accuracy requirements for the stepper motor control system are getting higher and higher. It divides the stator current into excitation component and torque component through field orientation to control separately, so as to obtain good decoupling characteristics. At present, many scholars combine these control technologies with each other to solve the deficiencies of simple control technologies. Therefore, vector control needs to control both the amplitude of the stator current and the phase of the current.

Intelligent control: It breaks through the traditional control method that must be based on the framework of the mathematical model, does not rely on or does not completely rely on the mathematical model of the controlled object, only controls according to the actual effect, and has the ability to consider the uncertainty and the system in the control. Adaptive control: It is a branch of the automatic control field developed in the 1950s.