Permanent magnet synchronous machine with transverse flux paths

摘要

Embodiments of an armature and magnet arrangement are specified with the aim of implementing large winding cross-sections with a small pole pitch in order thus to produce more favourable dimensioning and more favourable properties of electrical machines. In consequence, relatively large forces can be achieved per unit of the active pole surfaces (force densities) with lower losses in the armature winding, and thus lower utilisation of material with a high efficiency. A common feature of the proposals is that configurations of the magnetic circuits are specified whose parts enclose the armature winding on a plurality of sides transversely with respect to the movement direction, for example Figure 6. The magnetic flux is thus guided transversely, at least in subregions. Coils are provided which (related to their cross-sectional centre) have a greater extent than the pole pitch in the movement direction. They extend, for example, over more than two pole pitches before being closed in the transverse direction and running back. An approximately wave-shaped coil arrangement leads to additional material savings in the magnetic circuits and permits a reduction in the stray fluxes. As a result of their limited extent in the lateral direction, the arrangements are more suitable than conventional armature shapes (with projecting winding ends) for the design of double-acting disc machines. In consequence, very high powers can be achieved per rotor disc, as well as short structural lengths with a limited machine diameter. <IMAGE>