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A Combined Wye-Delta Connection to Increase the Performance of Axial-Flux PM Machines With Concentrated Windings

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4 Author(s)
Vansompel, H. ; Dept. of Electr. Energy, Syst. & Autom., Ghent Univ., Ghent, Belgium ; Sergeant, P. ; Dupre, L. ; van den Bossche, A.

In this paper, a combined wye-delta connection is introduced and compared with a conventional wye-connection of a concentrated winding. Because the combined wye-delta connection has a higher fundamental winding factor, the output torque is higher for the same current density when a sinusoidal current is imposed. As the combined wye-delta connection has only a minor influence on the losses in the machine, the efficiency of the machine is also increased. The combined wye-delta connection is illustrated in detail for an axial-flux permanent-magnet synchronous machine with a rated power of 4 kW at a fixed speed of 2500 r/min, using finite element computation and measurements on a prototype machine.

Published in:

Energy Conversion, IEEE Transactions on  (Volume:27 ,  Issue: 2 )