Research On The Weak Magnetic Control Technology Of A New Permanent Magnet Synchronous Gyro Motor

Gyro motor is an important element in gyro theodolite,its performance can directly affect the gyro theodolite work accuracy.In the gyroscope,it is hoped that the gyroscopic motor has a high precision of steady speed,so as to reduce the orientation error,and at the same time,it must have a high speed to reduce the influence of the disturbing torque on the north seeking during the orientation process.At present,the domestic research on gyro motor mainly focuses on the BLDCM,however,the torque ripple of BLDCM is large,which affects the orientation accuracy.Moreover,the conventional control method has too narrow speed regulation range and it is difficult to achieve the above base speed speed regulation.PMSM,which is a permanent magnet synchronous motor and sinusoi dal wave back electromotive force,has a small torque ripple,and its corresponding weakening control technology can obviously increase the motor speed and has been obtained in the fields of high-speed rail and electric vehicles a wide range of applications.In this paper,starting from the sine wave permanent magnet synchronous gyro motor,the field weakening control technology is applied to the field of gyro motor,the use of PMSM to reduce the torque ripple and improve the speed stability;using weak magnetic control to improve the motor speed and enhance anti-jamming torque capacity,Thereby improving the orientation accuracy of the gyro theodolite.Therefore,this paper provides a new way for the research of high performance gyroscopes.This paper firstly introduces the background and significance of the thesis,the development status of gyro theodolite,gyro motor and field weakening control technology.At the same time,because the gyro motor is not suitable for the installation of sensors,the development of sensorless control technology is briefly described.S econdly the mathematical model of permanent magnet synchronous motor and the vector control and voltage space vector pulse width modulation(PWM)algorithm are introduced.Based on the simulation,a simulation model of PMSM and vector control system is established,which lays a theoretical foundation for the research of the full text.Thirdly,the field weakening control technology of permanent magnet synchronous motor are studied.Because of the simple and easy-to-use engineering of the weak magnetic control of the negative direct current compensation,the weak magnetic control strategy based on the negative id compensation is adopted and the simulation model is established on MATLAB.Then,the control technique of the position sensorless is studied.Then,the position sensorless control technology is researched.The combination of the Lu enberger observer and the phase-locked loop system is studied.In order to further improve the estimation accuracy of the rotor position,the conventional phase-locked loop is improved and propose an enhanced Phase-locked loop,and passed the simulation.Finally,the software and hardware system are introduced,and the experimental verification of the above algorithm is completed.The experimental results show that the applied control method can meet the application requirements of gyro motor.