Yasa Limited

Christopher Thomas McCaw

Andrew Court

Tim Woolmer

Timothy Woolmer

Jonathan James Biddulph

Mark Stephen Ewart East

Sophie Ann Parker

An axial flux machine () is provided, in which the rotor () is cooled via air cooling, provided by impeller blades () located on the opposite side of the rotor () to the stator (). An impeller cover () covers the impeller blades () such that air channels are defined between adjacent blades. The air channels have an air inlet () at an inner radial portion of the rotor (), and an air outlet () at the outer radial extremity of the impeller blades (). As the rotor () turns, the air is drawn through the air channel from the air inlet () to the air outlet (). The motor () may be enclosed within a housing (), in which case air ducting () may be used to guide air to the air inlet (), and from the air outlet () to the outside of the housing ().

Axial flux machine

A double-rotor single stator axial flux machine, which is supplied having no bearings between the rotors and stator internal of the machine, is mounted to an external structure such as an interface of an engine of a vehicle or a portion of the transmission of a vehicle. The machine is mounted to the structure via the shaft of the machine (on which are seated bearings located in the structure) and the stator housing. The bearings of the structure, which are external to the machine, permit the rotors to rotate relative to the stator when the machine is installed on the structure.

We describe a method of manufacturing a stator of an axial flux permanent magnet machine, the machine having a stator comprising a stator housing defining a chamber comprising a set of coils wound on respective stator bars and disposed circumferentially at intervals about an axis of the machine, and a rotor bearing a set of permanent magnets and mounted for rotation about said axis, and wherein said rotor and stator are spaced apart along said axis to define a gap therebetween in which magnetic flux in the machine is generally in an axial direction, the method comprising: providing first and second radial walls for said stator housing; providing inner and outer side walls for said stator housing; assembling said first and second radial walls and said inner and outer side walls around said set of coils to form a stator assembly, wherein said assembling further comprises: providing one or more collapsible elements between said side walls and one or both of said first and second radial walls; and attaching said side walls to said first and second radial walls, wherein said attaching comprises controlling one or both of a spacing and a degree of parallelism of said first and second radial walls by controlling the collapse of said one or more collapsible elements.

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Abingdon, United Kingdom

Christopher Thomas McCaw