A master thesis from Aalborg University
Hybrid adaptive observer for controlling
Author(s)
Term
10. term
Publication year
2007
Submitted on
2007-05-24
Pages
0 pages
Abstract
This report documents the work conducted on the development of hybrid adaptive observers for a BLDCM. The goal of the project is to investigate the possibilities of using those observers in the control of brushless DC motors. A previously designed observer was improved by changing its structure and decreasing its computational demands. Various optimization techniques for finding the observers’ parameters were investigated and suitable methods were selected. An observer that uses only one current sensor to estimate the rotor’s angle and speed was designed. A new hybrid automaton and continuous equations for this observer were derived. Both of the observers were tested and have shown good results in open loop estimation. Simulations were run to verify the possibility of controlling the motor using the observers’ estimates. Then the observers were tested to control a real BLDCM. The observer that utilizes two current sensors was found to be able to provide sufficient information for control in a reduced operating region than. The single sensor observer estimates did not remain stable; thus it is concluded that it is not possible to remove the second sensor in the current setup.
Keywords
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