Model Predictive Control Method for Position Sensorless Permanent Magnet Synchronous Motor Based on Novel Sliding Mode Observer

Abstract

The invention discloses a model predictive control method for a permanent magnet synchronous motor without a position sensor of a novel sliding mode observer, belonging to the field of electromechanical control. By improving the traditional sliding mode observer, the Type II tracking loop is used to track the angular frequency and phase angle information of the two-phase equivalent back electromotive force estimated by the sliding mode observer, effectively avoiding the traditional method of using arctangent and differential operations to obtain The high-frequency noise that will be amplified when taking the rotor position and speed makes the rotor position estimation more accurate. At the same time, based on the motor rotor position angle estimated by the improved sliding mode observer, the finite set model predictive control strategy is adopted, without the need to adjust the parameters of the current inner loop, and the sensorless operation is realized, which improves the system reliability and reduces the hardware cost.

Description

technical field [0001] The invention relates to a positionless control method of a permanent magnet synchronous motor. It is suitable for situations where motor position sensors such as rail transit, aerospace, CNC machine tools, and logistics and transportation consume a lot of cost, cannot be installed, or have poor reliability. Background technique [0002] Permanent magnet synchronous motor has outstanding advantages such as high efficiency and high power density, and has been widely used in electric vehicles, aerospace and other systems. Permanent magnet synchronous motors usually use position sensors to detect the rotor position in real time, but traditional mechanical position sensors are easily affected by environmental conditions such as temperature and humidity, and as part of the system, their reliability is reduced. Algorithm instead of traditional mechanical position sensor to obtain motor rotor position angle and speed has been studied a lot. [0003] Among t...

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Problems solved by technology

[0004] The purpose of the present invention is to make the designed new sliding mode observer accurately and quickly estimate the position information, and have strong anti-interference ability to high-frequency interference and DC interference, and finally feed back the high-precision position information to the controller to control The motor operates reliably, and the position estimation module based on the new sliding mode observer replaces the position sensor, thereby solving the problems of high cost, poor reliability in harsh environments, and difficulty in large-scale implementation of the position sensor.

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