Split permanent magnet machine
AssigneeStellenbosch University
InventorsMaarten Jan Kamper, Johannes Hendrik Jacob Potgieter, Johan Nico Stander
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Abstract
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.
Claims10
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.
An electrical energy conversion system comprising two rotors and a stator with a first of the two rotors being an induction type cage rotor and a second of the two rotors being a permanent magnet rotor which is freely rotating thereby spinning concentrically with the stator when in use, the freely rotating permanent magnet rotor being magnetically connected to the stationary stator and including two co-axially aligned, magnetically separated rotor portions each rotor portion having a series of permanent magnets spaced apart about its periphery, the rotor portions being positioned to allow the series of magnets on a first rotor portion to excite coils on the stator and the series of magnets on the second rotor portion to excite coils on a induction type cage rotor.
Dependencies are inferred from the claim text.