Rotor for a reluctance machine
A rotor for a reluctance machine includes a central rotor support rigidly connected to a machine shaft extending laterally along a central axis of the machine. The rotor support has an outer rotor support surface. A non-ferromagnetic channel support is rigidly affixed to the rotor support surface and projects radially relative to the central axis from the rotor support surface to define an outer rotor diameter of the rotor. The rotor also includes an array of arcuate ferromagnetic flux guide channels. The flux guide channels are embedded in the non-ferromagnetic channel support, wherein portions of the channel support abutting the flux guide channels function as non-ferromagnetic flux barriers. The flux barriers provide structural support for the flux guide channels.
1. A rotor for a reluctance machine, the rotor comprising:
a central rotor support rigidly connected to a machine shaft extending laterally along a central axis of the machine, the rotor support having an outer rotor support surface;
a non-ferromagnetic channel support rigidly affixed to the rotor support surface and projecting radially relative to the central axis from the rotor support surface to define an outer rotor diameter of the rotor; and
an array of arcuate ferromagnetic flux guide channels, the flux guide channels embedded in the non-ferromagnetic channel support, wherein portions of the channel support abutting the flux guide channels function as non-ferromagnetic flux barriers, the flux barriers providing structural support for the flux guide channels;
wherein the rotor further comprises a ferromagnetic wedge composed of ferromagnetic material extending laterally relative to the central axis and disposed under the smallest arcuate flux guide channel, the wedge having a radially inner surface proximate the smallest arcuate flux guide channel, and a radially outer surface proximate the outer rotor diameter.
2. The rotor of claim 1 wherein the flux guide channels of the array have a pair of ends proximate the outer rotor diameter, the flux guide channels being stacked radially outward relative to the central axis from a largest arcuate flux guide channel to a smallest arcuate flux guide channel.
3. The reluctance machine of claim 1 wherein the ferromagnetic wedge includes an aperture disposed laterally there through, the aperture defining a radially outer portion of the wedge on a side of the aperture proximate the outer rotor diameter for reducing ripple and a radially inner portion of the wedge on an opposing side of the aperture proximate the smallest arcuate flux guide channel for guiding magnetic flux.
4. The rotor of claim 1 wherein the channel support is composed of a non-ferromagnetic, non-electrically conductive material.
5. The rotor of claim 4 wherein the non-ferromagnetic, non-electrically conductive material comprises one of polyether ether ketone (PEEK), polyphenylene sulfide (PPS), polyetherimide (PEI), polyimide-imides (PAI), polyethersulfone (PES) and a ceramic material.
6. The rotor of claim 1 wherein the flux guide channels are not connected to each other by support structures composed of a ferromagnetic material.
7. The rotor of claim 1 wherein the flux guide channels comprise laminated stacks of ferro-magnetic metal sheets having insulation disposed there between, the laminated stacks extending laterally relative to the central axis.
8. The rotor of claim 1 wherein the flux guide channels comprise solid ferromagnetic material extending laterally relative to the central axis.