Full-speed range control method of built-in permanent magnet synchronous motor based on fuzzy controller

Abstract

Provided is a full-speed range control method of a built-in permanent magnet synchronous motor based on a fuzzy controller. The method includes the steps of simplifying a current control strategy of aconstant torque zone and a constant power zone of the built-in permanent magnet synchronous motor, and improving operating speed of a processor in an actual control system; designing a fuzzy logic controller which includes input and output membership degree functions and a fuzzy rule; introducing integral control into a control system to further eliminate steady-state errors. According to the method, the fuzzy logic controller is introduced into the control system, an integral link is added, so that the control system has the advantages of rapid response, insensitivity of parameter variationsand perturbations, low model accuracy requirements, no need of system online identification, simple physical realization and the like, and dynamic response and robustness of the built-in permanent magnet synchronous motor are improved.

Description

technical field [0001] The invention relates to a full-speed domain control method of a built-in permanent magnet synchronous motor. In particular, it relates to a fuzzy controller-based full-speed domain control method for built-in permanent magnet synchronous motors. Background technique [0002] Since the interior permanent magnet synchronous machine (IPMSM) has the characteristics of high power density, high reliability, high efficiency, simple structure, and low cost, it is widely used in speed-adjustable drive systems with high requirements such as electric vehicles. a wide range of applications. In order to improve the operating efficiency of the motor, a Maximum Torque Per Ampere (MTPA) control algorithm is usually used below the base speed. In the actual system control system, the capacity of the inverter is fixed. As the motor speed increases until it reaches the base speed point of the motor, the stator voltage of the motor reaches the maximum output voltage of ...

AI Technical Summary

Problems solved by technology

[0003] The traditional full-speed domain control strategy is usually based on the PI controller, which has the advantages of simple structure, easy adjustment, and easy implementation, but there are the following problems: (1) The traditional PI controller with fixed parameters does not have the ability to adjust parameters in real time , cannot meet the requirements of online adjustment parameters, and cannot realize the high-precision and high-stability magnetic field weakening requirements of built-in permanent magnet synchronous motors

(2) IPMSM has the characteristics of multi-variable, nonlinear, strong coupling, etc., and it is difficult to establish an accurate mathematical model, which makes the use of PI control vulnerable to factors such as system internal parameter changes and external disturbances, and the system is not robust.

(3) In the application of electric vehicles, IPMSM is often in the state of overload or high-speed field weakening, the armature reaction is strong, and the motor parameters change greatly. If the influence of parameter changes on the control system is not considered, the output torque of the motor will decrease. Problems such as narrowing of constant power area and decrease of motor efficiency

[0004] Therefore, the traditional full-speed domain control strategy based on the PI controller is often difficult to achieve satisfactory control results in the case of motor parameter changes or load disturbances.

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