Stator module and planar drive system

Patent metadata

Field	Value
Publication number	US-11437902-B2
Application number	US-202016896650-A
Country	US
Kind code	B2
Filing date	Jun 9, 2020
Priority date	Dec 27, 2017
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

A stator module for two-dimensionally driving a rotor having first and second magnet units comprises a stator assembly including first and second stator segments for interacting with drive magnets of the first and second magnet units. The individual stator segments may each be energized independently from the remaining stator segments. The stator assembly comprises first, second, third and fourth stator sectors. The first stator segments of the individual stator sectors each extend in a second direction over all second stator segments of the relevant stator sector arranged side by side, and the second stator segments of the individual stator sectors each extend in a first direction over all first stator segments of the relevant stator sector arranged side by side. Extensions of the stator sectors in the first and second directions are respectively smaller than extensions of a magnet arrangement comprising the magnet units.

First claim

The invention claimed is:

1. A planar-drive system comprising:
a stator module, and
a rotor, wherein the rotor comprises a magnet arrangement, wherein the magnet arrangement comprises at least one first magnet unit and at least one second magnet unit;
wherein the first magnet unit comprises elongated drive magnets arranged side by side in a first rotor direction and extending along a second rotor direction oriented perpendicularly to the first rotor direction, and
wherein the second magnet unit comprises elongated drive magnets arranged side by side in the second rotor direction and extended along the first rotor direction;
the stator module comprising a stator assembly having at least one stator sector which, in a first stator layer, has first stator segments for interaction with the drive magnets of the first magnet unit and, in a second stator layer arranged below the first stator layer, second stator segments for interacting with the drive magnets of the second magnet unit,
wherein the first stator segments comprise elongated conductor strips arranged side by side along a first direction and extending along a second direction oriented perpendicularly to the first direction,
wherein the second stator segments comprise elongated conductor strips arranged side by side along the second direction and extending along the first direction,
wherein the conductor strips of the individual stator segments may each be energized independently from the conductor strips of the remaining stator segments,
wherein the first stator segments of the stator sector in the second direction extend over all second stator segments of the stator sector arranged side by side,
wherein the second stator segments of the stator sector in the first direction extend over all the first stator segments of the stator sector arranged side by side,
wherein a sector width of the stator sector is in the first direction smaller than an extension of the magnet arrangement in the first rotor direction, and
wherein a sector length of the stator sector is in the second direction smaller than an extension of the magnet arrangement in the second rotor direction.

2. The planar-drive system according to claim 1 , wherein the stator sector in the first stator layer consists of three first stator segments which may be energized independently from one another and in the second stator layer consists of three second stator segments which may be energized independently from one another.

3. The planar-drive system according to claim 1 ,
wherein a segment width of the first stator segments in the first direction corresponds to a magnetizing period of the first magnet unit, and
wherein a segment width of the second stator segments in the second direction corresponds to a magnetizing period of the second magnet unit.

4. The planar-drive system according to claim 1 ,
wherein the segment width of the first stator segments is in the second direction three times the magnetizing period of the first magnet unit, and
wherein the segment width of the second stator segments is in the first direction three times the magnetizing period of the second magnet unit.

5. The planar-drive system according to claim 1 ,
wherein a conductor period of the conductor strips of the first stator segments corresponds to a sixth of a magnetizing period of the first magnet unit, and
wherein a conductor period of the conductor strips of the second stator segments corresponds to a sixth of a magnetizing period of the second magnet unit.

6. The planar-drive system according to claim 1 , wherein an extension of the first magnet unit in the first rotor direction corresponds to a magnetizing period of the first magnet unit and an extension of the second magnet unit in the second rotor direction corresponds to a magnetizing period of the second magnet unit.

7. The planar-drive system according to claim 1 , wherein the stator sector is square so that the sector width of the stator sector in the first direction corresponds to the sector length of the stator sector in the second direction.

8. The planar-drive system according to claim 1 , wherein an outer edge of the stator sector is flush with an outer edge of the stator module, so that the stator sector and a stator sector being flush with an outer edge of the further stator module arranged beside the stator module may be arranged adjacent to one another.

9. The planar-drive system according to claim 1 ,
wherein the stator assembly comprises three further stator sectors,
wherein in the first direction and in the second direction the stator sector and the further stator sectors of the stator assembly are each arranged in two rows next to one another and adjoining one another, and
wherein the further stator sectors in the first and second stator layers each comprise further ones of the first and second stator segments respectively.

10. A stator module for driving a rotor, which comprises:
a first magnet unit having elongate drive magnets arranged side by side in a first rotor direction and extending along a second rotor direction oriented perpendicularly to the first rotor direction, and
a second magnet unit with elongated drive magnets arranged side by side in the second rotor direction and extending along the first rotor direction;
wherein the stator module comprises a stator assembly, the stator assembly comprising a first stator sector, a second stator sector, a third stator sector and a fourth stator sector,
the stator sectors each having first stator segments in a first stator layer of the stator assembly for interaction with the drive magnets of the first magnet unit and, in a second stator layer of the stator assembly arranged below the first stator layer, second stator segments for interacting with the drive magnets of the second magnet unit;
wherein the first stator segments comprise elongated conductor strips arranged side by side along a first direction and extending along a second direction oriented perpendicularly to the first direction,
wherein the second stator segments comprise elongated conductor strips arranged side by side along the second direction and extending along the first direction,
wherein the conductor strips of the individual stator segments may each be energized independently from the conductor strips of the remaining stator segments,
wherein the first stator segments of the first, second, third and fourth stator sectors in the second direction respectively extending over the second stator segments of the first, second, third and fourth stator sectors arranged side by side,
wherein the second stator segments of the first, second, third and fourth stator sectors in the first direction respectively extend over all the first stator segments of the first, second, third and fourth stator sectors arranged side by side,
wherein the stator sectors in the first stator layer consist of three first stator segments which may be energized independently from one another, and in the second stator layer consisting of three second stator segments which may be energized independently from one another,
wherein a sector width of the stator sectors is in the first direction smaller than an extension of a magnet arrangement of the rotor, comprising the first and second magnet units in the first rotor direction, and
wherein a sector length of the stator sectors is in the second direction smaller than an extension of the magnet arrangement in the second rotor direction.

11. The stator module according to claim 10 ,
wherein the first stator segments each comprise six conductor strips arranged side by side, and
wherein the second stator segments each comprise six conductor strips arranged side by

Assignees

• Beckhoff Automation Gmbh

Inventors

• Brinkmann Rolf
• Bentfeld Lukas
• Pruessmeier Uwe

Classifications

• H02K2201/18

  Machines moving with multiple degrees of freedom · CPC title

• H02K11/33

  Drive circuits, e.g. power electronics (H02K11/38 takes precedence) · CPC title

• H02K41/031 Primary

  of the permanent magnet type · CPC title

• B65G54/02

  electrostatic, electric, or magnetic · CPC title

• B65G37/02

  Flow-sheets for conveyor combinations in warehouses, magazines or workshops · CPC title