access icon free Sensorless control strategy for doubly salient electro-magnetic machine based on the line-to-line excitation flux linkage

© The Institution of Engineering and Technology
Received 12/04/2019, Accepted 01/07/2019, Revised 25/06/2019, Published 01/07/2019

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.

Inspec keywords: low-pass filters; magnetic flux; sensorless machine control; electric machines; high-pass filters; commutation

Other keywords: sensorless control strategy; phase current; three-state standard angle control; error accumulation; DC bias; equivalent inductance; line-to-line excitation flux linkage; doubly salient electro-magnetic machine; first-order high-pass filter; first-order low-pass filter; power 9.0 kW; commutation error; armature reaction; zero-crossing points

Subjects: Control of electric power systems; d.c. machines; a.c. machines

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