Note: This content is accessible to all versions of every browser. However, this browser does not seem to support current Web standards, preventing the display of our site's design details.


Electric Drive Platform: Speed control


B. Kalay

Semester Thesis, FS15 (10430)

To control a permanent magnet synchronous motor, traditionally a position sensor is used. However, by eliminating the position sensor, cost and complexity of the system can be drastically reduced. In sensorless control, information of speed and position are extracted from electrical quantities, which for this particular project correspond to the motors back EMF. The main problem, of the estimation based on back EMF, is that at low speeds, since the effect of disturbances in the system gets more powerful as the back EMF gets smaller, information extraction becomes difficult. The aim of this project is to create a realistic simulation test bench in Simulink environment and evaluate a promising back EMF observer algorithm, so as to understand the limitations of it. In addition, a hybrid observer scheme is proposed and tested in simulation, which combines the back EMF observer with the motor Hall sensors, in order to overcome the aforementioned problems while in low speed. In conclusion, at low speeds, it is found to be that hybrid observer not only provides better control, but also manages to maintain control, where back EMF observer fails.

Supervisors: Marko Tanaskovic, Damian Frick, Manfred Morari


Type of Publication:

(13)Semester/Bachelor Thesis

M. Morari

File Download:

Request a copy of this publication.
(Uses JavaScript)
% Autogenerated BibTeX entry
@PhdThesis { Xxx:2015:IFA_5227
Permanent link