Aisin Seiki Kabushiki Kaisha

Anthony David Wearing

Peter Hugh Birch

Mark G Norton

Michael John Atkinson

Takeshi Ikeyama

Andrew Hamilton Harson

Eddy current loss is a significant problem in high speed permanent magnet alternator/motors. Leakage flux from the rotor magnets 32, which flows through any stationary electrically conductive material such as a bearing housing 12 will result in eddy current loss. The invention uses a magnetic flux barrier means 29,36 to prevent magnetic flux leakage from the magnets 32 to the stationary electrically conductive material 12. The flux barrier means may comprise a diverter disk 29 made from a magnetically permeable material which is located on the shaft 18 next to the rotor 26 and rotates integrally with the rotor. Alternatively it may comprise a barrier ring 36 made from an electrically conductive material which is stationary on the end of the stator 27 and extends across the air gap 38 between the rotor 26 and the stator 27.

High speed alternator/motor

A gas turbine engine driven auxiliary electric power unit which includes a turbine (9), an air compressor (7) for supplying compressed air to the turbine and driven by the turbine, fuel supplying means (2) for supplying gaseous fuel to the turbine, a generator (10) driven by the turbine for generating electrical output power which is fed to a main electric user supply (14), first detecting means (15) for monitoring turbine shaft speed, second detecting means (19) for monitoring the output power of the generator, first modulating means (16,18,13) for modulating the turbine shaft speed to cause it to coincide with a predetermined shaft speed (17) by means of controlling current flow from the generator to the main electric user supply, and second modulating means (20,22,23) for modulating the flow of gaseous fuel which is supplied from the fuel supplying means to the turbine so as to cause the monitored output power to coincide with a predetermined output power (21).

Growing community of inventors

Brighton, United Kingdom

Anthony David Wearing