Open AccessSensorless control strategy for doubly salient electro‐magnetic machine based on the line‐to‐line excitation flux linkage
Author(s) -
Liu Weifeng,
Wang Huizhen,
Wang Yongjie,
Xiao Lan,
Zhang Hongyan
Publication year - 2019
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
ISSN - 1751-8679
DOI - 10.1049/iet-epa.2019.0322
Subject(s) - flux linkage , control theory (sociology) , inductance , excitation , magnetic flux , line (geometry) , filter (signal processing) , integrator , commutation , physics , voltage , computer science , mathematics , engineering , magnetic field , electrical engineering , geometry , control (management) , direct torque control , quantum mechanics , artificial intelligence , induction motor
This article presents a sensorless control strategy based on the line‐to‐line excitation flux linkage for doubly salient electro‐magnetic machine. The negative‐going zero‐crossing points of the line‐to‐line excitation flux linkage are detected to estimate the position and speed. To solve the problems of direct current (DC) bias and error accumulation in pure integrator, a combination of first‐order low‐pass filter and first‐order high‐pass filter is adopted to estimate the line‐to‐line flux linkage. Considering that the self‐inductance obviously varies with the position and the phase current, an equivalent inductance is introduced to calculate the line‐to‐line excitation flux linkage in the whole period. The commutation error caused by the filter and the armature reaction is analysed and proved to be within ±6°. The proposed method can be applied to either the three‐state standard angle control or the six‐state advanced angle control. The experiment platform based on a 9‐kW/3000‐rpm DSEM is built, and the validity and feasibility of the proposed strategy are proved.