The Turbo Genset Company Limited

Rolls-royce Corporation

Arnoldo Fenocchi

Keith Robert Pullen

Mohammad Reza Etemad

Mohammad R Etemad

Laurence W Eggleston

Kevin J Horton

Hugh R Bolton

The invention provides a stator coil construction in which the thickness of the stator windings is reduced without the need for interconnections within the stator. The reduction in thickness of the stator windings is accomplished by wire flattening.

Method of forming a winding disc for an axial field electrical machine

A rotary electrical machine ( ) has at least one stator ( ). The stator is provided with at least one radial channel ( ) for ducting cooling air. The channel ( ) extends between a first position ( ) at or substantially near the rim ( ) of a winding region of the stator ( ) and a second position ( ) at or substantially near the center ( ) of the winding region. The machine ( ) has cooling means ( ) for causing cooling air to enter the radial channel ( ) via the second position ( ) and exit via the first position ( ). The stator may have electrical windings arranged as coil sectors ( ) disposed substantially equi-angularly in a generally circular pattern. At least some of the coil sectors are wound in a generally spiral fashion when viewed axially. A rotor ( ), for the machine may have a plurality of equi-angularly spaced magnets ( ), which are generally circular but with a cut-away portion, when viewed axially.

Rotary electrical machines

A rotary electrical machine (1) has a least one stator (23). The stator is provided with at least one radial channel (107) for ducting cooling air. The channel (107) extends between a first position (113) at or substantially near the rim (109) of a winding region of the stator (23) and a second position (119) at or substantially near the center (51) of the winding region. The machine (1) has cooling means (91-97) for causing cooling air to enter the radial channel (107) via the second position (119) and exit via the first position (113). The stator may have electrical windings arranged as coil sectors (183-197) disposed substantially equi-angularly in a generally circular pattern. At least some of the coil sectors are wound in a generally spiral fashion when viewed axially. A rotor (13), for the machine may have a plurality of equi-angularly spaced magnets (127), which are generally circular but with a cut-away portion, when viewed axially.

Potentially very high power ratings can be achieved from rotary electrical generators in which permanent magnet rotor stages using modern high intensity magnetic materials, for example cobalt samarium or neodymium boron iron. The machine described comprises a plurality of axial field rotor stages each comprising a plurality of magnet segments arranged around a driven hub in a pre-stressed assembly in which encompassing hoop means exerts sufficient compressive stress on the magnets and hub assembly to counter centripetal forces generated by speeds of up to 100,000 rpm. Alternative methods of stressing the hoop means is described.

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Wimbledon, United Kingdom

Arnoldo Fenocchi