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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)
Hendrik Vansompel ; Department of Electrical Energy, Systems and Automation, Ghent University, B-9000 Ghent, Belgium ; Peter Sergeant ; Luc Dupre ; Alex Bossche

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:

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