Characteristics of the Roesel Machine Used for Small Scale Hydro/Wind or Sea Wave Electric Power Generation and Storage

by Dan Levy, Univ of Limerick, Limerick, Irel, Univ of Limerick, Limerick, Ireland,



Document Type: Proceeding Paper

Part of: Water Power '87

Abstract: An electrical machine with property of synchronous as well as asynchronous characteristics and based on ceramic magnet programming technology by continuous printing of the desired number of poles on the rotor to allow fixed output frequency independant on speed is analysed and the advantages and disadvantages of such machine for hydro/wind/sea wave generator are given. The machine has ability in particular for long inertial storage time which is useful in electric power generation from sea wave turbines with pulsating power characteristics. The rotor of the machine is normally made from ceramic magnet with no slip rings or commutators. The machine is analysed in two modes of operation, self excitation and grid excitation to feed power to the utility grid system. The machine can feed direct power to the grid without an interface, synchronization network, governor or gear ratio if the stator winding is wound properly according to the turbine requirement. The reactive power is adjustable to be 'leading' or 'lagging'.

Subject Headings: Electric power | Electrical equipment | Hydro power | Ocean waves | Wave generation | Excitation (physics) | Wind power

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