# US 2018/0323664 A1 · Permanent magnet based electric machine having enhanced torque > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0323664 A1 - Document ID: US20180323664A1 - Status: Published application - Kind: A1 - Application number: 15/586,336 - Filed: 2017-05-04 - Published: 2018-11-08 - Earliest claimed: 2017-05-04 - Assignees: General Electric Company - Applicants: General Electric Company - Inventors: Patel Bhageerath REDDY; Deepak ARAVIND - Web page: https://patentgrep.com/patent/US20180323664A1 ## CPC - H02P 6/32: Arrangements for controlling wound field motors, e.g. motors with exciter coils - H02K 1/278: Surface mounted magnets; Inset magnets - H02K 1/30: using intermediate parts, e.g. spiders - H02K 21/042: {with permanent magnets and field winding both rotating} - H02P 25/024: controlled by supply frequency - H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] - 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 is presented. The electric machine includes a stator. The electric machine further includes rotor disposed adjacent to the stator. The rotor includes a rotor core, a plurality of permanent magnets disposed in contact with the rotor core, a plurality of permanent magnets disposed in contact with the rotor core to modulate torque exerted on the rotor. ## Claims ### Claim 1 An electric machine, comprising: a stator; a rotor disposed adjacent to the stator and comprising: a rotor core; a plurality of permanent magnets disposed in contact with the rotor core; and one or more electrically conductive coils disposed at least partially within the rotor core; and a power source electrically coupled to the one or more electrically conductive coils to supply electrical excitation to the one or more electrically conductive coils to modulate torque exerted on the rotor. ### Claim 2 (depends on 1) The electric machine of claim 1, wherein the rotor core comprises a plurality of slots on a surface of the rotor core, wherein the plurality of permanent magnets is disposed in the plurality of slots on a surface of the rotor core such that at least one surface of the each of the plurality of permanent magnets is exposed to the stator. ### Claim 3 (depends on 1) The electric machine of claim 1, wherein the rotor core comprises a plurality of slots within the rotor core, wherein the plurality of permanent magnets is disposed in the plurality of slots within the rotor core. ### Claim 4 (depends on 1) The electric machine of claim 1, wherein the one or more electrically conductive coils are disposed surrounding respective permanent magnets of the plurality of permanent magnets. ### Claim 5 (depends on 1) The electric machine of claim 1, wherein the one or more electrically conductive coils are disposed between adjacent permanent magnets of the plurality of permanent magnets. ### Claim 6 (depends on 1) The electric machine of claim 1, wherein the stator comprises: a stator core comprising a plurality of stator poles; and a stator winding disposed in slots between adjacent stator poles of the plurality of stator poles. ### Claim 7 (depends on 6) The electric machine of claim 6, wherein the power source comprises a power converter coupled between the stator winding and the one or more electrically conductive coils. ### Claim 8 (depends on 7) The electric machine of claim 7, wherein the power converter comprises an AC to direct current (DC) converter. ### Claim 9 (depends on 7) The electric machine of claim 7, wherein the power converter comprises at least one of a battery and a DC to DC converter. ### Claim 10 (depends on 1) The electric machine of claim 1, wherein the rotor is disposed within the stator. ### Claim 11 (depends on 1) The electric machine of claim 1, wherein the stator is disposed within the rotor. ### Claim 12 (depends on 1) The electric machine of claim 1, wherein the rotor core comprises a plurality of laminates. ### Claim 13 An electric machine, comprising: a stator; and a rotor disposed adjacent to the stator and comprising: a rotor core; a plurality of permanent magnets disposed in contact with the rotor core; and one or more electrically conductive coils disposed at least partially within the rotor core to modulate torque exerted on the rotor. ### Claim 14 (depends on 13) The electric machine of claim 13, wherein the one or more electrically conductive coils are disposed surrounding the plurality of permanent magnets. ### Claim 15 (depends on 13) The electric machine of claim 13, further comprising a power source electrically coupled to the one or more electrically conductive coils to supply electrical excitation to the one or more electrically conductive coils to modulate torque exerted on the rotor. ### Claim 16 (depends on 15) The electric machine of claim 15, wherein the power source comprises an AC to direct current (DC) converter, a battery, a DC to DC converter, or combinations thereof. ### Claim 17 An electric motor, comprising: a stator comprising a plurality of windings configured to be excited by an alternating current; a rotor disposed adjacent to the stator and comprising: a rotor core; a plurality of permanent magnets disposed in contact with the rotor core; and one or more electrically conductive coils disposed at partially within the rotor core; and an alternating current (AC) to direct current (DC) converter electrically coupled between the one or more electrically conductive coils and the plurality of windings to generate a DC current from the AC current supplied to the plurality of windings and supply the DC current to the one or more electrically conductive coils to modulate torque exerted on the rotor. ### Claim 18 (depends on 17) The electric motor of claim 17, wherein the stator comprises a stator core comprising a plurality of stator poles, and wherein the plurality of windings is disposed in slots between adjacent stator poles of the plurality of stator poles. ### Claim 19 (depends on 17) The electric motor of claim 17, wherein the one or more electrically conductive coils are disposed between adjacent permanent magnets of the plurality of permanent magnets. ### Claim 20 (depends on 17) The electric motor of claim 17, wherein the one or more electrically conductive coils are disposed surrounding respective permanent magnets of the plurality of permanent magnets.