A master thesis from Aalborg University
Sensorless speed and position estimation of a PMSM
Author(s)
Term
4. term
Education
Publication year
2014
Submitted on
2014-06-03
Pages
75 pages
Abstract
This Project focuses on investigating the sensorless speed and position estimation control of a Surface Mounted Permanent Magnet Syn-chronous Machine for medium and high speed,proposing a bandwidth for dierent steady and dynamic states and investigating about the angular estimation position error. Back-EMF method is used to estimate the position, and Phase Loop Lock (PLL) method is used to estimate the speed. An Auto-tuning is designed for both in order to achieve good performance based on the bandwidth and the position error. A Field Oriented Control (FOC) system was designed which is know to give good results andgood dynamic performance. A VSI controls the machine currents using Space Vector Modula-tion (SVM). First The literature is searched for a suitable Back-EMF sensorless control method, position error and bandwidth. Then the selected best methods are implemented and tested in the simulation. The overall selected control system is tested in the laboratory setup and compare the sensorless control strategy with the sensored control.
Documents
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