# US 2013/0154423 A1 · Axial flux alternator with one or more flux augmentation rings > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0154423 A1 - Document ID: US20130154423A1 - Status: Published application - Kind: A1 - Application number: 13/715,572 - Filed: 2012-12-14 - Published: 2013-06-20 - Earliest claimed: 2011-12-14 - Inventors: Steven C. Hench - Web page: https://patentgrep.com/patent/US20130154423A1 ## CPC - H02K 1/27: Rotor cores with permanent magnets - H02K 1/2795: the rotor consisting of two or more circumferentially positioned magnets - H02K 16/00: Machines with more than one rotor or stator {(machines for transmitting mechanical power from a driving shaft to a driven shaft and comprising structurally interrelated motor and generator parts H02K51/00; permanent magnet machines with multiple rotors or stators relatively rotated for vectorially combining the excitation fields or the armature voltages H02K21/029)} - H02K 21/24: with magnets axially facing the armatures, e.g. hub-type cycle dynamos - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract An axial flux alternator may comprise one or more rotors comprising magnets, one or more stators comprising coils, one or more flux augmentation rings comprising a ferrous material, wherein the magnets, coils, and at least a portion of the flux augmentation rings are arranged at a substantially similar radial distance from the common axis, and wherein the rotors are rotatable about the common axis. Another axial flux alternator may comprise one or more flux augmentation rings, magnets configured to travel along a predetermined path, and coils disposed between the flux augmentation ring and the predetermined path, wherein the flux augmentation ring is configured to draw a magnetic flux field from the magnets that crosses the conductive coils thereby creating a voltage potential therein. An axial flux alternator system may comprise one or more rotors, flux augmentation rings, and stators, an input source, and an output load. ## Claims ### Claim 1 An axial flux alternator comprising: one or more rotors, each rotor comprising one or more magnets; one or more stators, each stator comprising one or more coils of electrically conductive material; one or more flux augmentation rings comprising a ferrous material; wherein the one or more rotors, one or more stators, and one or more flux augmentation rings are arranged about a common axis with predetermined spacing between each; wherein the one or more magnets, one or more conductive coils, and at least a portion of the one or more flux augmentation rings are arranged at a substantially similar radial distance from the common axis; and wherein the one or more rotors are rotatable about the common axis. ### Claim 2 (depends on 1) The axial flux alternator of claim 1, wherein the one or more rotors comprise non-ferrous materials. ### Claim 3 (depends on 1) The axial flux alternator of claim 1, wherein the one or more magnets are embedded within the one or more rotors. ### Claim 4 (depends on 1) The axial flux alternator of claim 1, wherein the one or more magnets are arranged in a pattern with alternating polarities on a given rotor. ### Claim 5 (depends on 1) The axial flux alternator of claim 1, wherein the one or more stators comprise non-ferrous materials. ### Claim 6 (depends on 1) The axial flux alternator of claim 1, wherein the one or more stators comprise dielectric materials. ### Claim 7 (depends on 6) The axial flux alternator of claim 6, wherein the dielectric materials are arranged in multiple layers. ### Claim 8 (depends on 1) The axial flux alternator of claim 1, wherein the one or more stators comprise materials configured to reduce the build up of Lenz force therein. ### Claim 9 (depends on 1) The axial flux alternator of claim 1, wherein the one or more flux augmentation rings comprise steel material. ### Claim 10 (depends on 1) The axial flux alternator of claim 1, wherein a given flux augmentation ring is rotationally coupled with an adjacent rotor. ### Claim 11 (depends on 1) The axial flux alternator of claim 1, wherein the one or more stators comprise slots to facilitate winding of the coils. ### Claim 12 (depends on 11) The axial flux alternator of claim 11, wherein adjacent slots have necked regions arranged in alternating orientations. ### Claim 13 (depends on 11) The axial flux alternator of claim 11, wherein the one or more coils are wound about the slots in an over/under pattern configured to minimize warping forces on the one or more stators. ### Claim 14 (depends on 1) The axial flux alternator of claim 1, wherein at least one of the one or more stators comprises coils on opposite surfaces of the stator. ### Claim 15 (depends on 1) The axial flux alternator of claim 1, wherein at least one of the one or more stators is disposed between a rotor and a flux augmentation ring. ### Claim 16 (depends on 1) The axial flux alternator of claim 1, having a ratio of magnets to coils greater than or equal to 2:1. ### Claim 17 An axial flux alternator comprising: one or more flux augmentation rings comprising a ferrous material; one or more magnets configured to travel along a predetermined path, at least a portion of the path being offset from and aligned substantially parallel to at least a portion of the flux augmentation ring; one or more coils of electrically conductive material disposed between the flux augmentation ring and the predetermined path; wherein the flux augmentation ring is configured to draw a magnetic flux field from the one or more magnets; and wherein as the one or more magnets travel along the predetermined path, the magnetic flux field crosses the one or more conductive coils thereby creating a voltage potential therein. ### Claim 18 (depends on 17) The axial flux alternator of claim 17, wherein the one or more magnets and correspondingly aligned portions of the one or more flux augmentation rings move together. ### Claim 19 (depends on 18) The axial flux alternator of claim 18, wherein the movement of the one or more magnets and correspondingly aligned portions of the one or more flux augmentation rings substantially eliminates cogging. ### Claim 20 An axial flux alternator system comprising: one or more rotors rotatable about an axis, each rotor comprising one or more magnets; one or more flux augmentation rings comprising a ferrous material, each flux augmentation ring being substantially centered about the axis and offset from an adjacent rotor; one or more stators centered about the axis, each stator being disposed between one of the one or more rotors and one of the one or more flux augmentation rings, each stator comprising one or more electrically conductive coils; wherein the one or more magnets, one or more conductive coils, and at least a portion of the one or more flux augmentation rings are arranged at a substantially similar radial distance from the common axis; an input source capable of transferring mechanical energy to the one or more rotors; and an output load capable of receiving electrical energy from the one or more coils; wherein the input source drives rotation of the one or more rotors, providing for magnetic fields spanning between the one or more magnets and the one or more flux augmentation rings to cross the one or more conductive coils, thereby generating electrical energy that is transferred to the output load. ### Claim 21 (depends on 20) The axial flux alternator of claim 20, wherein the one or more coils are connected in series for single-phase power takeoff ### Claim 22 (depends on 20) The axial flux alternator of claim 20, wherein subsets of the one or more coils are wired in series for multi-phase power takeoff.