Double-supply-frequency pressure pulsation in annular linear induction pump, part II: reduction of pulsation by linear winding grading at both stator ends

In the previous work, the authors showed that the double-supply-frequency pressure pulsation comes from a disturbance of the electromagnetic force occurring near the stator ends, and hence the pressure pulsation may be reduced by some way that suppresses this disturbance, e.g. by a winding grading at the stator ends. In the present work, an experiment and a numerical analysis are carried out to verify the effect of linear winding grading. The experimental data and the numerical results show that this type of grading is an effective way to reduce the pressure pulsation. In addition, the experimental data reveals that the linear winding grading improves the pump efficiency.