Permanent Magnet Synchronous Motor Speed Sensorless Control

With the development of magnetic and power electronics technology, permanent magnet synchronous motor is widely used in a variety of transmission equipments. For permanent magnet synchronous motor control, common control strategies like PID has the problem of parameter uncertainties, dynamic performance deficiency etc. To improve the dynamic response of current loop, designed a deadbeat controller. According to the current state of permanent magnet synchronous motor equations, derived the deadbeat current predictive models and simplified the prediction model through parameter analysis. Simulation results show that the deadbeat permanent magnet synchrons motor system has good dynamic performance, quick response, and these advantages make this method effective.In this system, two current sensors and a position sensor is required. Position sensor is expensive and is easily affected by the work environment, That is why speed sensorless control technology is increasing rapidly, and become a hot spot of permanent magnet synchronous speed control. Current methods of speed sensorless techniques are direct input method, observer method, and model reference adaptive method. Direct input method is do not have error corrented link. Computational complexity of the observer, and builds a simulation model is built to verify the feasibility and advantage.This paper analyzes the theory of MRAS, use a C language program for permanent magnet synchronous motor speed sensorless vector control and sensorless vector control. Then validated on the platform of PESX-II Power Elecronics and Power Transmission Test platform. By comparing the experiments,proved the effectiveness and practicality.