Planar drive system

Patent metadata

Field	Value
Publication number	US-12119774-B2
Application number	US-202217988079-A
Country	US
Kind code	B2
Filing date	Nov 16, 2022
Priority date	May 26, 2020
Publication date	Oct 15, 2024
Grant date	Oct 15, 2024

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.

First claim

The invention claimed is:

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.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. The planar drive system according to claim 1 , wherein the rotor comprises a voltage measuring device for measuring the alternating voltage.

9. The planar drive system according to claim 8 , wherein the rotor comprises a processing device for evaluating the measured alternating voltage.

10. The planar drive system according to claim 1 , wherein the rotor comprises a rectifier for converting the alternating voltage into a direct voltage.

11. 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.

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.

13. 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.

14. 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.

15. 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.

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-wid

Assignees

• Beckhoff Automation Gmbh

Inventors

• Bentfeld Lukas
• Brinkmann Rolf
• Jebramcik Patrick
• Kaulmann Tim

Classifications

• H02P6/006

  Controlling linear motors · CPC title

• H02P25/064

  of the synchronous type · CPC title

• H02K2201/18

  Machines moving with multiple degrees of freedom · CPC title

• H02K11/35

  Devices for recording or transmitting machine parameters, e.g. memory chips or radio transmitters for diagnosis · CPC title

• H02P29/40

  Regulating or controlling the amount of current drawn or delivered by the motor for controlling the mechanical load · CPC title