# US 11,909,292 B2 · Moving coil brushless motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,292 B2 - Document ID: US11909292B2 - Status: Granted - Kind: B2 - Application number: 17/497,737 - Filed: 2021-10-08 - Published: 2022-04-14 - Granted: 2024-02-20 - Earliest claimed: 2020-10-09 - Assignees: Systems, Machines, Automation Components Corporation - Applicants: Systems, Machine, Automation Components Corporation - Inventors: Edward A. Neff; Koen Bastiaens; Dave C. J. Krop; Elena A. Lomonova; Toan Minh Vu; Reyhan Zanis - Web page: https://patentgrep.com/patent/US11909292B2 ## CPC - H02K 21/26: with rotating armatures and stationary magnets - H02K 41/031: {of the permanent magnet type} - H01F 38/18: Rotary transformers - H02K 16/04: Machines with one rotor and two stators - H02K 29/08: using magnetic effect devices, e.g. Hall-plates, magneto-resistors (H02K29/12 takes precedence) - H02P 6/006: {Controlling linear motors} - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS ## Abstract A moving coil brushless motor including an actuator having a stator and a rotor. The stator includes a cylindrical array of permanent magnets. The rotor includes a coil assembly having a plurality of coils interposed between a stator back plate and the permanent magnet array. The coil assembly rotates relative to the array of permanent magnets. A center shaft is disposed to rotate about a longitudinal axis. A cylindrical transformer is disposed within an interior space circumscribed by the stator back plate and includes a primary side and a secondary side. The primary side includes a primary coil and the secondary side includes a secondary coil magnetically coupled to the primary coil. Primary electronics are in communication with secondary electronics attached to the center shaft. The secondary electronics are configured to receive power from the secondary coil and to provide current to the actuator. ## Claims ### Claim 1 A moving coil brushless motor, comprising: an actuator including: a stator having an outer array of permanent magnets arranged in a first cylindrical configuration and an inner array of permanent magnets arranged in a second cylindrical configuration on an inner back plate; a rotor including: a coil assembly including a plurality of coils interposed between the outer array of permanent magnets and the inner array of permanent magnets wherein the coil assembly is disposed to rotate relative to the outer array of permanent magnets and the inner array of permanent magnets; a center shaft disposed to rotate about a longitudinal axis; a cylindrical transformer disposed within an interior space circumscribed by the inner back plate, the cylindrical transformer including a primary side and a secondary side wherein the primary side includes a primary coil and the secondary side includes a secondary coil, the primary coil being magnetically coupled to the secondary coil; primary electronics disposed within the interior space; and secondary electronics disposed within the interior space wherein the primary electronics are in communication with the secondary electronics and wherein the secondary electronics are attached to the center shaft, the secondary electronics being configured to receive power from the secondary coil and to provide current to the actuator, wherein the secondary electronics include power conditioning electronics having a rectifier connected to the secondary coil and a phase inverter connected between an output of the rectifier and the coil assembly. ### Claim 2 (depends on 1) The moving coil brushless motor of claim 1 wherein the inner array of permanent magnets includes a first plurality of circumferentially magnetized permanent magnets and a first plurality of radially magnetized permanent magnets and wherein ones of the circumferentially magnetized permanent magnets are interposed between pairs of the radially magnetized permanent magnets. ### Claim 3 (depends on 2) The moving coil brushless motor of claim 2 wherein the outer array of permanent magnets includes a second plurality of circumferentially magnetized permanent magnets and a second plurality of radially magnetized permanent magnets. ### Claim 4 (depends on 1) The moving coil brushless motor of claim 1 wherein the secondary electronics further include a micro-controller disposed to receive a portion of a rectified current produced by the rectifier. ### Claim 5 (depends on 1) The moving coil brushless motor of claim 1 wherein the primary electronics are attached to the inner back plate. ### Claim 6 (depends on 1) The moving coil brushless motor of claim 1 wherein the primary electronics include a master controller and the secondary electronics include a micro-controller and wherein the master controller communicates with the micro-controller through one of the transformer or an optical link. ### Claim 7 (depends on 6) The moving coil brushless motor of claim 6 wherein the primary electronics further include a DC power source and a full bridge rectifier wherein the full bridge rectifier is connected between the DC power source and the primary coil. ### Claim 8 (depends on 1) The moving coil brushless motor of claim 1 wherein the outer array of permanent magnets is arranged on an outer back plate such that the outer array of permanent magnets is between the outer back plate and the coil assembly. ### Claim 9 (depends on 1) The moving coil brushless motor of claim 1 wherein the primary side is mounted to the inner hack plate and the secondary side is mounted to the center shaft. ### Claim 10 (depends on 1) The moving coil brushless motor of claim 1 wherein the primary coil and the secondary coil bound a radial gap extending parallel to the longitudinal axis. ### Claim 11 (depends on 1) The moving coil brushless motor of claim 1 wherein the primary side includes a primary coil placed in a first core and the secondary side includes a secondary coil placed in a second core. ### Claim 12 A moving coil brushless motor, comprising: an actuator including: a stator having an outer array of permanent magnets arranged in a first cylindrical configuration and an inner array of permanent magnets arranged in a second cylindrical configuration on an inner back plate; a rotor including: a coil assembly including a plurality of coils interposed between the outer array of permanent magnets and the inner array of permanent magnets wherein the coil assembly is disposed to rotate relative to the outer array of permanent magnets and the inner array of permanent magnets; a center shaft disposed to rotate about a longitudinal axis; a cylindrical transformer disposed within an interior space circumscribed by the inner back plate, the cylindrical transformer including a primary side and a secondary side wherein the primary side includes a primary coil and the secondary side includes a secondary coil, the primary coil being magnetically coupled to the secondary coil; primary electronics disposed within the interior space, and secondary electronics disposed within the interior space wherein the primary electronics are in communication with the secondary electronics and wherein the secondary electronics are attached to the center shaft, the secondary electronics being configured to receive power from the secondary coil and to provide current to the actuator; wherein the inner back plate is comprised of aluminum such that the actuator is substantially shielded from high-frequency electromagnetic energy produced by the cylindrical transformer. ### Claim 13 A moving coil brushless motor, comprising: an actuator including: a stator having an outer array of permanent magnets arranged in a first cylindrical configuration and an inner array of permanent magnets arranged in a second cylindrical configuration on an inner back plate: a rotor including: a coil assembly including a plurality of coils interposed between the outer array of permanent magnets and the inner array of permanent magnets wherein the coil assembly is disposed to rotate relative to the outer array of permanent magnets and the inner array of permanent magnets; a center shaft disposed to rotate about a longitudinal axis; a cylindrical transformer disposed within an interior space circumscribed by the inner back plate, the cylindrical transformer including a primary side and a secondary side wherein the primary side includes a primary coil and the secondary side includes a secondary coil, the primary coil being magnetically coupled to the secondary coil; primary electronics disposed within the interior space and secondary electronics disposed within the interior space wherein the primary electronics are in communication with the secondary electronics and wherein the secondary electronics are attached to the center shaft, the secondary electronics being configured to receive power from the secondary coil and to provide current to the actuator; wherein the outer array of permanent magnets is arranged on an outer back plate such that the outer array of permanent magnets is between the outer back plate and the coil assembly, and wherein the inner back plate is comprised of aluminum and the outer back plate is comprised of carbon steel.