# US 12,119,774 B2 · Planar drive system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,774 B2 - Document ID: US12119774B2 - Status: Granted - Kind: B2 - Application number: 17/988,079 - Filed: 2022-11-16 - Published: 2023-03-09 - Granted: 2024-10-15 - Earliest claimed: 2020-05-26 - Assignees: Beckhoff Automation GmbH - Applicants: Beckhoff Automation GmbH - Inventors: Lukas Bentfeld; Rolf Brinkmann; Patrick Jebramcik; Tim Kaulmann - Web page: https://patentgrep.com/patent/US12119774B2 ## CPC - H02P 6/10: Arrangements for controlling torque ripple, e.g. providing reduced torque ripple - H02K 11/35: Devices for recording or transmitting machine parameters, e.g. memory chips or radio transmitters for diagnosis - H02K 41/031: {of the permanent magnet type} - H02P 6/006: {Controlling linear motors} - H02P 25/06: Linear motors - H02P 25/064: of the synchronous type - H02P 29/40: Regulating or controlling the amount of current drawn or delivered by the motor for controlling the mechanical load - H02P 29/50: Reduction of harmonics - H02K 2201/18: Machines moving with multiple degrees of freedom - 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 A planar drive system comprises a stator and a rotor. The stator comprises a plurality of energizable stator conductors. The rotor comprises a magnet device having at least one rotor magnet. A magnetic interaction can be produced between energized stator conductors of the stator and the magnet device to drive the rotor. The stator is configured to carry out energization of the stator conductors so that an alternating magnetic field can be generated via the energized stator conductors. The rotor comprises at least one rotor coil in which an alternating voltage can be induced due to the alternating magnetic field. The planar drive system is configured to transmit data from the stator to the rotor, and the stator is configured to temporarily influence the energization of the stator conductors in order to temporarily cause a change with respect to the alternating voltage induced in the at least one rotor coil. ## Claims ### Claim 1 A planar drive system comprising: a stator, and a rotor; wherein the stator comprises a plurality of energizable stator conductors, wherein the rotor comprises a magnet device having at least one rotor magnet, wherein a magnetic interaction is producible between energized stator conductors of the stator and the magnet device of the rotor in order to drive the rotor, wherein the stator is configured to carry out energization of the energizable stator conductors such that an alternating magnetic field is generated via the energized stator conductors, wherein the rotor comprises at least one rotor coil in which an alternating voltage is inducible due to the alternating magnetic field, and wherein the planar drive system is configured to transmit data from the stator to the rotor, in that the stator is configured to temporarily influence the energization of the energizable stator conductors in order to thereby temporarily cause a change with respect to the alternating voltage inducible in the at least one rotor coil of the rotor. ### Claim 2 (depends on 1) The planar drive system according to claim 1, wherein the stator comprises an influencing device for temporarily influencing the energization of the energizable stator conductors. ### Claim 3 (depends on 2) The planar drive system according to claim 2, wherein the stator is configured to perform the energization of the energizable stator conductors by a current control based on a pulse-width modulation, and wherein the influencing device is configured to temporarily influence the current control. ### Claim 4 (depends on 3) The planar drive system according to claim 3, wherein, due to the current control, a ripple current in the energized stator conductors of the stator and thereby the alternating magnetic field are generated, and wherein the influencing device is configured to influence the current control such that a change with respect to the ripple current is caused in the energized stator conductors. ### Claim 5 (depends on 3) The planar drive system according to claim 3, wherein the influencing device is configured to suppress a supplying of the energizable stator conductors with voltage pulses that is carried out during the current control. ### Claim 6 (depends on 3) The planar drive system according to claim 3, wherein the energizable stator conductors of the stator are connected to form multiphase systems which are energizable independently of one another, wherein energized multiphase systems are supplied with voltage pulses which are center-aligned with respect to one another during the current control, and wherein the influencing device is configured to influence current control of at least one of the multiphase systems such that voltage pulses having matching pulse widths are applied to the energized multiphase system. ### Claim 7 (depends on 1) The planar drive system according to claim 1, wherein the stator is configured to perform the influencing of the energization of the energizable stator conductors in modulated form. ### Claim 8 (depends on 1) The planar drive system according to claim 1, wherein the rotor comprises a voltage measuring device for measuring the alternating voltage. ### Claim 9 (depends on 8) The planar drive system according to claim 8, wherein the rotor comprises a processing device for evaluating the measured alternating voltage. ### Claim 10 (depends on 1) The planar drive system according to claim 1, wherein the rotor comprises a rectifier for converting the alternating voltage into a direct voltage. ### Claim 11 (depends on 1) The planar drive system according to claim 1, wherein the planar drive system is configured to transmit data from the rotor to the stator, in that the rotor is configured to temporarily load the at least one rotor coil in order to thereby temporarily cause an increased current consumption of the energized stator conductors of the stator. ### Claim 12 A planar drive system comprising: a stator, and a rotor; wherein the stator comprises a plurality of energizable stator conductors, wherein the rotor comprises a magnet device having at least one rotor magnet, wherein a magnetic interaction is producible between energized stator conductors of the stator and the magnet device of the rotor in order to drive the rotor, wherein the stator is configured to carry out energization of the energizable stator conductors by a current control based on a pulse-width modulation, so that the energizable stator conductors are supplied with pulse-width modulated periodic voltage pulses, wherein, due to the current control based on pulse-width modulation, a ripple current in the energized stator conductors of the stator and thereby an alternating magnetic field are generated, wherein the rotor comprises at least one rotor coil in which an alternating voltage is inducible due to the alternating magnetic field, wherein the planar drive system is configured to transmit data from the stator to the rotor, in that the stator is configured to temporarily influence the energization of the energizable stator conductors in order to thereby temporarily cause a change with respect to the alternating voltage inducible in the at least one rotor coil of the rotor, and wherein the stator comprises an influencing device for temporarily influencing the energization of the energizable stator conductors for this purpose, which is configured to temporarily influence the current control such that a change with respect to the ripple current is caused in the energized stator conductors of the stator. ### Claim 13 (depends on 12) The planar drive system according to claim 12, wherein the change with respect to the ripple current comprises one of the following: suppressing the ripple current; or causing an increased or reduced value of the ripple current. ### Claim 14 (depends on 12) The planar drive system according to claim 12, wherein the influencing device is configured to suppress a supplying of the energizable stator conductors with voltage pulses that is carried out during the current control and to suppress occurrence of the ripple current in the energized stator conductors of the stator. ### Claim 15 (depends on 12) The planar drive system according to claim 12, wherein the energizable stator conductors of the stator are connected to form multiphase systems which are energizable independently of one another and which comprise a plurality of coils formed from the energizable stator conductors, wherein the current control is carried out based on a center-aligned pulse-width modulation in which coils of energized multiphase systems are supplied with voltage pulses which are center-aligned with respect to one another with reference to a time grid of the pulse-width modulation, said voltage pulses having different pulse-widths in an uninfluenced state, and wherein the influencing device is configured to influence current control of at least one of the multiphase systems such that voltage pulses having matching pulse widths are applied to the coils of the energized multiphase system and as a result, occurrence of the ripple current is suppressed in the at least one multiphase system. ### Claim 16 A planar drive system comprising: a stator, and a rotor; wherein the stator comprises a plurality of energizable stator conductors, wherein the rotor comprises a magnet device having at least one rotor magnet, wherein a magnetic interaction is producible between energized stator conductors of the stator and the magnet device of the rotor in order to drive the rotor, wherein the stator is configured to carry out the energization of the energizable stator conductors by a current control based on a pulse-width modulation, so that the energizable stator conductors are supplied with pulse-width modulated periodic voltage pulses, wherein, due to the current control based on pulse-width modulation, a ripple current in the energized stator conductors of the stator and thereby an alternating magnetic field are generated, wherein the rotor comprises at least one rotor coil in which an alternating voltage is inducible due to the alternating magnetic field, wherein the planar drive system is configured to transmit data from the stator to the rotor, in that the stator is configured to temporarily influence the energization of the energizable stator conductors in order to thereby temporarily cause a change with respect to the alternating voltage inducible in the at least one rotor coil of the rotor, and wherein the temporary influence of the energization of the energizable stator conductors comprises temporarily influencing the current control such that a change with respect to the ripple current is caused in the energized stator conductors of the stator. ### Claim 17 (depends on 16) The planar drive system according to claim 16, wherein the change with respect to the ripple current comprises one of the following: suppressing the ripple current; or causing an increased or reduced value of the ripple current. ### Claim 18 (depends on 16) The planar drive system according to claim 16, wherein the temporary influence of the current control comprises suppressing a supplying of the energizable stator conductors with voltage pulses that is carried out during the current control and suppressing occurrence of the ripple current in the energized stator conductors of the stator. ### Claim 19 (depends on 16) The planar drive system according to claim 16, wherein the energizable stator conductors of the stator are connected to form multiphase systems which are energizable independently of one another and which comprise a plurality of coils formed from the energizable stator conductors, wherein the current control is carried out based on a center-aligned pulse-width modulation in which coils of energized multiphase systems are supplied with voltage pulses which are center-aligned with respect to one another with reference to a time grid of the pulse-width modulation, said voltage pulses having different pulse-widths in an uninfluenced state, and wherein the temporary influence of the current control comprises influencing the current control of at least one of the multiphase systems such that the coils of the energized multiphase systems are supplied with voltage pulses having matching pulse widths and occurrence of the ripple current is suppressed in the at least one multiphase system.