Research On Position Sensorless Of PMSM Based On Extended Flux Observation

Permanent Magnet Synchronous Motor(PMSM)has the advantages of energy saving,high reliability,high speed range and high conversion efficiency.It has been widely used in the fields of household appliances,industrial control,electric traction and so on,especially in the field of new energy vehicles in recent years.In traditional PMSM control,position and speed information of rotor are usually obtained by installing position and speed sensor.Although the application of sensors makes the PMSM control more convenient,the sensor is affected by the environment and its own stability,which also brings various problems in the application.Based on this,the Interior Permanent Magnet Synchronous Motor(IPMSM)is the research object in this paper,and the sensorless control technology is discussed and studied.In the two phase stationary coordinate system,based on the analysis of the IPMSM voltage equation and the relationship between the magnetic chain,the concept of the extended magnetic chain is introduced.The four order state equation of the stator current and the extended magnetic chain is established.The full order extended flux observer is proposed.At the same time,a kind of IPMSM position sensorless control strategy is given in combination with the self-adaptive estimation method of the rotational speed.In the estimation part of the rotor position,the observer estimates the difference between the current and the current as feedback.In order to meet the convergence speed of the observer and the robustness of the parameter error,the feedback matrix is determined by the method of observer pole assignment to ensure that the observer can accurately estimate the expansion of the information containing the rotor position.The rotor position is obtained by further calculation.In the speed estimation part,based on the model reference adaptive algorithm,the rotational speed adaptive law is given according to the extended magnetic chain error equation and Popov's super stability theory,thus the speed estimation is obtained.On the basis of realizing the above estimation method,the Space Vector Pulse Width Modulation(SVPWM)is used to realize the vector control of the IPMSM sensorless sensor.In order to verify the control strategy,the system simulation model is built on the Matlab/Simulink platform based on the experimental IPMSM parameters.The simulation analysis results show that the IPMSM sensorless control method based on the extended magnetic chain observation is simple and can accurately estimate the rotor position information and speed.Then,the hardware and software design of the system is completed in the laboratory.The hardware control platform is built with DSP 28335 as the core.The control program is written and debugged using the CCSv5.0 development platform.The feasibility and effectiveness of the control method are further verified under the experimental conditions.