Novel five-phase fault tolerant permanent magnet motor sensorless control method based on expansion state observer

Abstract

The invention discloses a novel five-phase fault tolerant permanent magnet motor sensorless control method based on an expansion state observer. According to the method, the counter potential in the current state equation under a two-phase stationary coordinate system acts as interference quantity, correct estimation of the disturbance quantity can be realized without the differential and filtering link of the state variable, and the rotating speed and the rotor position of the motor can be obtained by using a phase-locked loop observer according to the observed counter potential. Meanwhile, a rotor position error compensation link changing along with the rotating speed of the motor is designed based on selection of the observer parameters so that novel five-phase fault tolerant permanent magnet motor sensorless control based on the ESO can be realized. According to the designed novel counter potential observer, the observer is simple in gain selection method and has great adaptability and robustness for the rotating speed and load change of the motor so that use of the filter can be avoided, and reliable operation of the five-phase fault tolerant permanent magnet synchronous motor sensorless system can be realized.

Description

technical field [0001] The invention relates to a novel five-phase fault-tolerant permanent magnet motor sensorless control method based on an extended state observer, which is suitable for the field of high-precision servo control of permanent magnet motors. Background technique [0002] The vector control of traditional high-performance permanent magnet synchronous motors usually requires position sensors to detect the position signals of the rotor. The position sensors mainly include Hall sensors, photoelectric encoders and resolvers. Although these sensors can provide position signals for the motor system, the position sensor will increase the cost of the system, and the installation of the position sensor will affect the accuracy of the motor control system, and the position sensor is a precision electronic component. Both humidity and vibration can have a great impact on the position sensor, which reduces the reliability of the motor system. [0003] The most direct w...

AI Technical Summary

Problems solved by technology

Among them, the sliding mode observer method is widely used. However, because it requires the differential signal of the current and the switching function it acts on, it will cause chattering problems in the estimated back EMF signal, and a multi-stage filter is required. to eliminate, increasing the complexity of the rotor position observer

Images