A Position Sensorless Control Method for Permanent Magnet Synchronous Motor Based on Simplified MRAS Method

Abstract

The invention discloses a position sensorless control method for a permanent magnet synchronous motor based on a simplified MRAS method, which belongs to the field of motor control systems and includes the following steps: S1: constructing a reference model of a permanent magnet synchronous motor position sensorless identification system based on the MRAS method and Adjustable model, S2: Constructing the IPMSM position identification system based on MRAS method, S3: Performing simulation analysis on the constructed IPMSM position identification system based on MRAS method, S4: Constructing an improved system with no position sensor algorithm after adding resistance identification, S5 : Simulate and analyze the improved system without position sensor algorithm after adding resistance identification. The position sensorless control method of permanent magnet synchronous motor based on the simplified MRAS method is more scientific and reasonable. On the premise of not affecting the control effect, the MRAS method is simplified and stator resistance identification is added, which makes the motor model more accurate and improves the rotor position identification. precision.

Description

technical field [0001] The invention relates to the field of motor control applications, in particular to a position sensorless control method for a permanent magnet synchronous motor based on a simplified MRAS method. Background technique [0002] With the transformation of military technology, all-electric armored vehicles integrating electric drive, electric weapons, electric protection, and comprehensive electronic information are important research objects for land warfare equipment in various countries. As the core of all-electric armored vehicles, electric drive systems replace The complex transmission structure in traditional mechanical vehicles transmits power directly to the wheels or crawlers through the drive motor and reducer. It has many advantages such as fast dynamic response, good control accuracy, high efficiency, and easy maintenance. Among them, the permanent magnet synchronous motor has High power density, good control performance and other superior perf...

AI Technical Summary

Problems solved by technology

[0003] The pulse vibration high-frequency injection method has a good identification effect when the motor is at low speed, but as the speed increases, factors such as high-frequency interference cause the injection method to be no longer suitable for motor position estimation

When the motor speed is high, the fundamental back EMF is large, and the position identification method based on the motor model can play a good role in making up for the shortcomings of the high-frequency injection method. Commonly used identification algorithms based on model points include SMO method, EKF method, Among them, the MRAS method is simple and easy to implement, and has a relatively strong ability to resist external interference, especially in the high-speed stage of the motor’s stable operation. It has better steady-state accuracy and dynamic performance. The following deficiencies need to be overcome: the identification effect is sensitive to the changes of various parameters of the motor. Among these parameters, the change of the stator resistance value caused by the temperature change during the operation of the wheel hub motor has a particularly obvious impact on the identification accuracy. If the resistance error is too large, it will be serious. Affect the performance of MRAS method

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