Electrical machines.

摘要

An alternating current electrical machine including a first part and a second relatively movable part and an airgap therebetween, one machine part including windings energisable in operation to produce a magnetic flux to move along said gap and link said parts, and means to energise the windings from a supply of alternating electric power, the windings having field pole turns to produce from applied power at one alternation magnetic flux fields at two alternations and the same movement direction, at least one of the alternations being a harmonic of the two-pole field for the applied alternating power and the field of lower alternations being of lesser strength and better airgap power factor than the other field.