# US 12,003,144 B2 · Power distribution within an electric machine with rectified rotor windings > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,003,144 B2 - Document ID: US12003144B2 - Status: Granted - Kind: B2 - Application number: 18/179,743 - Filed: 2023-03-07 - Published: 2023-07-20 - Granted: 2024-06-04 - Earliest claimed: 2020-07-31 - Assignees: Tau Motors, Inc. - Applicants: Tau Motors, Inc. - Inventors: Walter Wesley Pennington, III; Matthew J. Rubin; Gregory Gordon Stevenson; Michael Parker Owen; Ethan Bagget Swint; Matthias Preindl - Web page: https://patentgrep.com/patent/US12003144B2 ## CPC - H02P 6/08: Arrangements for controlling the speed or torque of a single motor (H02P6/10, H02P6/28 take precedence) - H02K 1/14: Stator cores with salient poles - H02K 1/223: {Rotor cores with windings and permanent magnets (for additional excitation in synchronous motors or generators H02K21/042; in synchronous motors having additional short-circuited winding for starting as an asynchronous motor H02K21/46)} - H02K 1/24: Rotor cores with salient poles {; Variable reluctance rotors} - H02K 11/042: Rectifiers associated with rotating parts, e.g. rotor cores or rotary shafts - H02K 21/042: {with permanent magnets and field winding both rotating} - H02P 6/00: Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor (vector control H02P21/00) - H02P 6/10: Arrangements for controlling torque ripple, e.g. providing reduced torque ripple - H02P 6/28: Arrangements for controlling current (H02P6/10 takes precedence) - H02P 6/32: Arrangements for controlling wound field motors, e.g. motors with exciter coils - H02P 21/22: Current control, e.g. using a current control loop - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract An electric machine includes a stator defining multiple stator poles with associated stator windings configured to receive a stator current. The electric machine also includes a rotor defining multiple fixed rotor poles with associated rotor windings, wherein the rotor defines a field energizable by magnetic fields produced by the stator windings when receiving the stator current to produce relative motion between the rotor and the stator and wherein the rotor is maintained in synchronicity with the magnetic fields produced by the stator during operation of the electric machine. The electric machine also includes a rectification system configured control against an alternating current being induced in the rotor poles as the field is energized by magnetic fields produced by the stator windings when receiving the stator current. ## Claims ### Claim 1 An electric machine comprising: a stator defining multiple stator poles with associated stator windings configured to receive a stator current; a rotor defining multiple fixed rotor poles with associated rotor windings, wherein the rotor defines a field energizable by magnetic fields produced by the stator windings, responsive to the stator windings receiving the stator current; and a rectification system configured to control against an alternating current being induced in the rotor poles as the field is energized by magnetic fields produced by the stator windings when receiving the stator current. ### Claim 2 (depends on 1) The electric machine of claim 1, wherein the rectification system includes a rectification component shorting across each of the multiple fixed rotor poles. ### Claim 3 (depends on 2) The electric machine of claim 2, wherein rectification components in the rectification system are configured to reduce a delay of energization of flux in an air gap between the stator and rotor. ### Claim 4 (depends on 1) The electric machine of claim 1, wherein the rectification system is configured to produce an asymmetric response to an electric field generated by the stator windings when receiving the stator current to control a rotor torque ripple. ### Claim 5 (depends on 1) The electric machine of claim 1, wherein the rectification system includes a respective rectifier arranged across each of the multiple fixed rotor poles. ### Claim 6 (depends on 1) The electric machine of claim 1, wherein the rectification system comprises a passive rectification system, or an active rectification system. ### Claim 7 (depends on 1) The electric machine of claim 1, further comprising a controller configured to: send the stator current through the stator windings at a current angle measured relative to a closest one of the rotor poles; determine a desired operational output of the electric machine; determine a desired rotor motion corresponding to the desired operational output of the electric machine; calculate a vector control modulation applied to the stator that elicits the desired rotor motion; adjust the current angle of the stator current based on the vector control modulation to cause the rotor to perform the desired rotor motion; and achieve the desired operational output of the electric machine. ### Claim 8 (depends on 1) The electric machine of claim 1, wherein the stator windings comprise distributed windings, and wherein the rotor comprises at least one of: concentrated windings; salient windings; non-overlapping windings; or permanent magnets. ### Claim 9 (depends on 1) The electric machine of claim 1, wherein the rotor comprises permanent magnets, and the permanent magnets are substantially aligned with the rotor poles. ### Claim 10 A method, comprising: receiving a stator current by stator windings of a stator of an electric machine, wherein the stator comprises multiple stator poles associated with the stator windings; responsive to the stator windings receiving the stator current, producing magnetic fields by the stator windings of the stator; energizing, by the magnetic fields, a field defined by a rotor of the electric machine to produce relative motion between the rotor and the stator, wherein the rotor comprises multiple fixed rotor poles with associated rotor windings; and controlling, by a rectification system of the electric machine, against an alternating current being induced in the rotor poles as the field is energized by the magnetic fields produced by the stator windings when receiving the stator current. ### Claim 11 (depends on 10) The method of claim 10, wherein the rectification system includes a rectification component shorting across each of the multiple fixed rotor poles. ### Claim 12 (depends on 11) The method of claim 11, wherein controlling, by the rectification system of the electric machine, against the alternating current being induced in the rotor poles comprises: reducing a delay of energization of flux in an air gap between the stator and the rotor by rectification components in the rectification system. ### Claim 13 (depends on 10) The method of claim 10, wherein controlling, by the rectification system of the electric machine, against the alternating current being induced in the rotor poles comprises: producing, by the rectification system, an asymmetric response to an electric field generated by the stator windings when receiving the stator current to control a rotor torque ripple. ### Claim 14 (depends on 10) The method of claim 10, wherein the rectification system includes a respective rectifier arranged across each of the multiple fixed rotor poles. ### Claim 15 (depends on 10) The method of claim 10, wherein the rectification system comprises a passive rectification system or an active rectification system. ### Claim 16 (depends on 10) The method of claim 10, comprising: sending the stator current through the stator windings at a current angle measured relative to a closest one of the rotor poles; determining a desired operational output of the electric machine; determining a desired rotor motion corresponding to the desired operational output of the electric machine; calculating a vector control modulation applied to the stator that elicits the desired rotor motion; and adjusting the current angle of the stator current based on the vector control modulation to cause the rotor to perform the desired rotor motion; and achieving the desired operational output of the electric machine. ### Claim 17 (depends on 10) The method of claim 10, wherein the rotor is maintained in synchronicity with the magnetic fields produced by the stator during operation of the electric machine. ### Claim 18 (depends on 10) The method of claim 10, wherein the stator windings comprise distributed windings, and wherein the rotor comprises at least one of: concentrated windings; salient windings; non-overlapping windings; or permanent magnets. ### Claim 19 (depends on 10) The method of claim 10, wherein the rotor comprises permanent magnets, and the permanent magnets are substantially aligned with the rotor poles.