Investigation of Torque Performance and Flux Reversal Reduction of a Three-Phase 12/8 Switched Reluctance Motor Based on Winding Arrangement

Abstract

The goal of this paper is to present a comparative analysis of two types of winding arrangements for a three-phase 12/8 switched reluctance motor (SRM), where short- and fully-pitched winding arrangements under unipolar operation are considered. From the analytical results, the short-pitched winding has the best torque per copper weight ratio. The core loss based on counting the number of flux reversals in the stator yoke for each winding arrangement is also proposed and mentioned. To reduce the magnetic flux reversals in the stator core, changing the direction of the magnetic flux path by modifying the winding polarities of the short-pitched winding could reduce 10–13% of core loss compared to the conventional winding. A 1 kW, 12/8 SRM prototype for the ventilation fan application is constructed and tested in order to verify the design consideration of winding configuration. At the rated condition, a maximum efficiency around 82.5% could be achieved.

Energy Efficiency Improvement of Electric Machines without Rare-Earth Magnets

“…At the same time, the cost of rare earth magnets is high, they are supplied by only a few suppliers, the raw material extraction process for their manufacture is harmful to the environment and there are problems with disposal. This gives good motivation for developing electric machines without rare earth magnets [1][2][3][4][5][6][7][8][9][10].…”

“…The results of testing the motor at the rated load are provided, verifying the theoretical results obtained. In [6], two winding layouts of a three-phase switched reluctance motor (SRM) with twelve stator teeth and eight rotor teeth are compared in terms of power loss and efficiency. It is shown that the winding with a short pitch provides a lower copper of loss than the winding with a full pitch.…”