CA2187096A1 - Three-phase electric machine with interlaced conductor layers - Google Patents

Abstract

In prior art three-phase electric machines with a layered winding, the conductor elements either make non-optimum use of the space in the slot or the conductors for each phase are in the form of large elements designed to be fitted into each other and whose manufacture is complicated and costly. The invention calls for the conductors (5-7) for each phase in the three-phase conductor layer (11) to be identical in construction and for the construction to be repeated every four pole pitches. While the phase conductors (5-7) occupy the full height of the layer within the magnetic field, two phase conductors (5-7) superposed one above the other in the slot share the space at the coil ends (9). At the slot exit, the conductor cross-section increases and only later, at the coil end (9), halved from only one side at each passage through the coil end. In order to alternate the layer halves, contact surfaces are available which are large in comparison to the conductor cross-section and the two winding ends (9) are uniformly utilized by virtue of the plaiting of the layers. The production of three-phase conductor layers by laying alternate conducting and insulating layers is particularly suitable for small electromagnetic machines, giving uniform space utilization and hence high effectiveness and a high power density at low cost, and requiring only a few operations.