Split permanent magnet machine

摘要

The invention relates to an electrical energy conversion system (11) which is particularly suited for use in wind energy conversion systems. The system includes two magnetically separated permanent magnet machines (25, 27) linked by a freely rotating rotor (19) housing permanent magnets (39). The first machine is typically a synchronous generator, and the second an induction generator. The synchronous generator (25) has a stationary stator (21) which is connectable to an electrical system such as an electricity grid, and the induction generator (27) has a rotor (17) which is connectable to a mechanical drive system such as, for example, a wind turbine.

主权项

1. An electrical energy conversion system comprising two permanent magnet machines;
a first of the two permanent magnet machines being a synchronous generator and having a stationary stator which is connectable to an electrical system; and a second of the two permanent magnet machines being an induction generator and having a cage rotor which is connectable to a mechanical system; wherein the two permanent magnet machines are magnetically separated from one another and have a common rotor that houses permanent magnets, wherein the common rotor is freely rotating thereby spinning concentrically with the stator when in use, wherein the common freely rotating permanent magnet rotor is magnetically connected to the stationary stator, and wherein the common freely rotating permanent magnet rotor rotates synchronously with the synchronous generator and the induction generator runs at slip speed with respect to the freely rotating permanent magnet rotor.