Encoder-less field-oriented control of permanent magnet synchronous motor by using a full order adaptive state observer Online publication date: Wed, 10-Jul-2019
by Sudhanwa Kelkar; B.B. Sharma
International Journal of Automation and Control (IJAAC), Vol. 13, No. 6, 2019
Abstract: This paper proposes a full order adaptive state observer, for the field-oriented control of a permanent magnet synchronous motor (PMSM), without using a speed sensor. The observer is designed in the estimated field-synchronous coordinate system. The rotor speed is treated as an unknown parameter. The adaptive law for speed is derived by using Lyapunov's stability theorem. Since control algorithms and models are processed in micro computers, the proposed observer has been discretised by Euler's method. To make the observer dynamically faster than the motor dynamics, observer poles are fixed proportionally to those of the motor by using pole placement technique. The simplifying assumptions used to discretise the observer, along with the stator current harmonics, introduce ripples in the estimated rotor speed. To mitigate this effect, various counter-measures are explored. The validity of proposed scheme is verified through MATLAB Simulink.
Online publication date: Wed, 10-Jul-2019
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Automation and Control (IJAAC):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email firstname.lastname@example.org