Patent ID: 7605681
Filing Date: 2009-10-20
Classification: H01F

Abstract:
1. A synchronous generator of a wind turbine being coupled to a transformer to transfer electrical power from a stationary member to a rotating member, the transformer comprising: an annular core form to receive an annular winding and having annular slots open in an axial or radial direction; an annular primary winding and an annular secondary winding disposed in the annular slots, the primary and secondary windings arranged axially or radially opposite each other, the primary winding disposed on the stationary member and the secondary winding disposed on the rotating member; and a plurality of members each having a U-shaped cross-sectional configuration that includes a first bar portion, a second bar portion and a crosspiece portion between the first and second bar portions and of an integral construction, each of the plurality of members having a shape of a ring segment such that each of the plurality of members is in an angular form of an arc of a ring and are a part of the annular core form, wherein the transformer is configured to transfer to a rotating portion of the generator the excitation power for operating the generator, the excitation power being more than 50 kW.