Alstom Renewable Technologies

Alstom Hydro France

Charles Smadja

A synchronous generator is provided. The generator includes a rotor, which rotates around a machine axis and is concentrically surrounded by a stator with a stator winding. A plurality of permanent magnets and pole pieces are alternatingly arranged at the rim of the rotor with the permanent magnets being oriented in an essentially tangential direction. Torque and power characteristic of the generator are improved by alternating pole pieces and pairs of permanent magnets. The permanent magnets each have a rectangular cross section in the axial direction, the pole pieces each have a symmetric trapezoidal cross section in the axial direction with the symmetry plane of the trapezoid extending radially through the machine axis and the longer parallel side lying outside. The two permanent magnets of each pair of permanent magnets are separated from each other by an intermediate wedge, which corresponds with its cross section to the trapezoidal pole pieces.

Synchronous generator, especially for wind turbines

A rotating electric machine, especially synchronous permanent magnet machine, is provided. The machine includes a rotor with a given number of magnets distributed along the circumference and a given number of rotor pole pairs, and further comprising a stator with a given number of stator pole pairs and a given number of stator slots. The efficiency and the power of the machine are improved by making the number of stator pole pairs independent of the number of rotor pole pairs.

Growing community of inventors

Toulouse, France

Charles Smadja