Yasa Limited

Timothy Woolmer

Andrew Court

Charles Edmund King

Jon Barker

Jonathan James Biddulph

Christopher Thomas McCaw

Mark Stephen Ewart East

Mark East

Christopher Edward Miller

Sophie Ann Parker

An axial flux machine is described. The machine has a stator comprising a stator housing enclosing a plurality of stator bars disposed circumferentially at intervals around an axis of the machine, and a rotor comprising a set of permanent magnets and mounted for rotation about the axis of the machine. The rotor is spaced apart from the stator along the axis of the machine to define a gap between the stator and rotor and in which magnetic flux in the machine is generally in an axial direction. The machine also comprises a hub assembly comprising a rotating hub and a mount separated by a bearing to permit the hub to rotate relative to the mount, the rotating hub comprising a hub flange and the mount comprising a mount flange, each of the flanges being spaced axially apart from one another. The machine further comprises a bulkhead for mounting the hub assembly and stator, wherein the bulkhead is mounted to the mount flange of the hub assembly and the stator housing is mounted to the bulkhead. The rotor comprises first and second rotors disposed either side of the stator, the first rotor being mounted to the hub flange and the second rotor being mounted only to the first rotor, the first and second rotors together forming a U-shaped rotor extending across and either side of the stator and being rotatable relative to the stator about the axis of the machine.

Axial flux machine

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.

Axial flux machine manufacture

There is provided an axial flux motor comprising one or more rotating disks () and a stator () comprising a cavity () formed between walls () and containing therein more than one electro-magnetic coil assembly (). Each electro-magnetic coil assembly () comprises more than one pole piece (), each having an axially extending shank portion () and first and second radially extending end shoes () and one or more associated coils (), each of the one or more associated coils () being wound around a shank portion (), wherein said outer surface () of said end shoes are preferably joined to one or other of said walls (). One or both of said first or second shoes further comprise a heat exchange surface () facing a coil () wound around the shank () such as to define first cooling channels () between one or both of said heat exchange surface () and said coil (), and a second flow channel () defined by the spacing of said coil () and adjacent coils ().

Pole shoe cooling gap for axial motor

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Wheatley, United Kingdom

Timothy Woolmer