Yasa Limited

Tom Hillman

Tim Woolmer

Richard Phillips

Simon David Hart

Christopher Stuart Malam

Ryan Potter

Various implementations include an axial flux machine including a rotor bearing a set of permanent magnets and a stator containing electro-magnetic coil assemblies disposed circumferentially at intervals about an axis. Each coil assembly has an axially extending stator tooth, one or more coils wound around the tooth, and one or more end shoes at an end of the stator tooth. The end shoes each have at least one circumferential edge adjacent a neighbouring coil assembly. In some implementations, radially innermost and outermost portions of the at least one circumferential edge are separated by a step projecting from the at least one circumferential edge. In some implementations, at least part of the at least one circumferential edge has a thickness less than a thickness of the inner radial edge thereby reducing a leakage flux between neighbouring electro-magnetic coil assemblies.

Axial flux machine shoe optimisation

Various implementations include a stator assembly for an axial flux permanent magnet machine. The stator assembly may include a set of stator bars and a set of shoes for the stator bars. A shoe may be provided at one or each end of a stator bar. The stator assembly may further include a set of coils each wound around a respective stator bar. Each shoe has an inner surface adjacent to the end of one of the stator bars. The end of each stator bar has a rim, and each inner surface has a cut-away region over part of the rim to reduce a component of magnetic flux at the end of the stator bar.

Stator assembly flux alignment

A stator having a plurality of stator bars disposed circumferentially at intervals around an axis is provided. Each of the stator bars has a set of windings wound therearound for generating a magnetic field generally parallel to the axis. A plurality of radially outwardly disposed electrical interconnects for connecting two or more windings together are provided radially outwardly of the plurality of stator bars and extending circumferentially along at least a portion of the outer periphery of the stator bars. A plurality of radially inwardly disposed electrical interconnects for connecting two or more windings together are also provided radially inwardly of the stator bars and extending circumferentially along at least a portion of the inner periphery of the stator bars. The outer periphery of the stator is devoid of radially outwardly disposed interconnects along one or more portions.

Stator for axial flux machine

A semiconductor arrangement and an inverter incorporating the semiconductor arrangement, in particular to an inverter for use with traction power units e.g. for on and off road vehicles and stationary power inversion, are described. In the arrangement, semiconductor devices are thermally and electrically coupled to a heatsink as a module. The heatsink is configured as a bus bar to electrically connect the one or more semiconductor devices together to transmit power between the one or more semiconductor devices. The semiconductor devices may be cooled using the structure to which they are attached, and also immersed in a cooling medium to further increase the cooling of the device.

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Oxford, United Kingdom

Tom Hillman