Stator module and planar drive system

Patent metadata

Field	Value
Publication number	US-11038410-B2
Application number	US-202016890887-A
Country	US
Kind code	B2
Filing date	Jun 2, 2020
Priority date	Dec 27, 2017
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A stator module is disclosed, and a planar drive system with a stator module. The stator module has a lower face opposite an upper face, a stator unit situated on the upper face, and a cooling unit. The stator unit has a coil to which current can be supplied to generate a magnetic field to drive a mover, positionable on the upper face of the stator module. The cooling unit has a cover thermally connected to a lower face of the stator unit and to the bottom of the housing. The bottom of the housing has a first fastening section on the lower face of the stator module, thermally connectable to a heat sink. The cover is designed to conduct heat out of the stator unit to the bottom of the housing, which is designed to conduct the heat at least partially to the first fastening section.

First claim

The invention claimed is:

1. A stator module for a planar actuator system, wherein the stator module has:
a module upper side extending in a plane and a module underside opposite the module upper side,
a stator unit, and
a cooling unit,
wherein the stator unit has at least one coil conductor configured to be energized by a drive current to generate a magnetic field for driving a moving body of the planar actuator system, positioned at the module upper side,
wherein the stator unit is arranged at the module upper side,
wherein the cooling unit has a housing cover and a housing base,
wherein the housing cover is arranged between the stator unit and the housing base,
wherein the housing cover is at least thermally connected to a stator underside of the stator unit at a cover upper side of the housing cover,
wherein the housing cover is thermally connected to the housing base on a cover underside facing away from the stator unit,
wherein the housing base is arranged at the module underside and has a first fastening portion at the module underside,
wherein the first fastening portion is thermally connected to a heat sink,
wherein the housing cover conducts heat from the stator unit to the housing base, and
wherein the housing base conducts the heat from the housing cover to the first fastening portion, at least in part.

2. The stator module as claimed in claim 1 ,
wherein the housing cover has a first housing portion and a second housing portion on the side facing the stator unit,
wherein the first housing portion and the second housing portion adjoin one another,
wherein the housing cover has at least one first heat-conducting structure at the first housing portion,
wherein the first heat-conducting structure comprises at least one first heat-conducting element,
wherein the first heat-conducting element extends in the direction of the stator unit and abuts against the stator unit at a contact face and is thermally coupled to the stator unit, and
wherein a control unit of the stator module is arranged in the second housing portion.

3. The stator module as claimed in claim 2 ,
wherein the first heat-conducting structure comprises a plurality of first heat-conducting elements, and
wherein the first heat-conducting elements are arranged at a spacing from one another.

4. The stator module as claimed in claim 2 ,
wherein the first heat-conducting element is in the form of a pin,
wherein the housing cover has a cover portion in the form of a plate,
wherein the cover portion is arranged at a spacing from the stator unit,
wherein, in each case, the first heat-conducting element is connected to the cover portion by a side opposite the contact face, and
wherein the first heat-conducting element is aligned at an angle, or perpendicularly, to the cover portion.

5. The stator module as claimed in claim 4 ,
wherein the cover portion and the stator unit delimit a first interior space of the stator module, and
wherein the first interior space is filled with a thermally conductive and electrically insulating potting compound such that the control unit is embedded in the potting compound, and the potting compound transfers heat from the stator unit and/or the control unit to the housing cover.

6. The stator module as claimed in claim 2 ,
wherein the second housing portion is flat on the cover upper side,
wherein the housing cover has an edge on the side facing the stator unit,
wherein the edge is formed circumferentially at the housing cover and delimits the interior space laterally,
wherein the edge extends in the direction of the stator unit,
wherein the first heat-conducting structure is arranged between the second housing portion and the edge, and
wherein the first heat-conducting structure extends over the entire first housing portion between the edge and the second housing portion.

7. The stator module as claimed in claim 1 ,
wherein the housing cover has a cover portion in the form of a plate, a further edge on a side facing the housing base, a second heat-conducting structure and a center region,
wherein the further edge is arranged at the cover portion and extends in the direction of the housing base,
wherein the second heat-conducting structure adjoins the further edge internally and has at least one second heat-conducting element,
wherein the second heat-conducting element is connected to the cover portion on the side facing away from the housing base and is thermally connected to the housing base on the side facing the housing base,
wherein the second heat-conducting structure of the center region is arranged internally and is surrounded by the second heat-conducting structure, and
wherein the center region is planar and is arranged at a spacing from the housing base.

8. The stator module as claimed in claim 7 , having:
a sensor module,
wherein the housing cover and the housing base delimit a second interior space,
wherein the sensor module is arranged in the second interior space,
wherein the sensor module is electrically connected to the control unit,
wherein the sensor module has at least one position-detection unit for detecting a magnetic field of the moving body, a printed circuit board and at least one processing unit,
wherein the position-detection unit is connected to the printed circuit board,
wherein the printed circuit board connects the processing unit to the position-detection unit,
wherein the processing unit is arranged on a side of the printed circuit board which faces the housing cover,
wherein a processing-unit receptacle is arranged in the cover portion on a side facing the housing base,
wherein the processing-unit receptacle corresponds to the processing unit,
wherein the processing unit engages in the processing-unit receptacle, at least in certain portions,
wherein the processing unit is thermally connected to the cover portion, and
wherein the cover portion dissipates heat from the processing unit, and to conduct it to the housing base, for the purpose of cooling the processing unit.

9. The stator module as claimed in claim 7 ,
wherein the printed circuit board has at least one housing passage,
wherein the housing passage corresponds to the second heat-conducting element, at least in certain portions, and
wherein the second heat-conducting element passes through the housing passage and abuts against the housing base at the end.

10. The stator module as claimed in claim 7 ,
wherein the second heat-conducting structure has a plurality of second heat-conducting elements,
wherein the second heat-conducting elements are arranged at a pre-defined spacing, or at a regular spacing, from one another,
wherein an intermediate space is arranged between the two heat-conducting elements, and
wherein the printed circuit board is arranged in the intermediate space, at least in certain portions.

11. The stator module as claimed in claim 1 , having:
a module cover, and
a further control unit,
wherein the housing base and the module cover delimit a third interior space,
wherein the further control unit is arranged in the third interior space,
wherein the module cover is arranged on a side facing away from the housing cover and such that it is offset from the first fastening portion,
wherein the module cover is thermally connected to the further control unit, and
wherein the module cover has a cooling rib structure on a side facing away from the housing base.

12. The stator module as claimed in claim 11 ,
wherein the housing base has a second fastening portion at the module underside,
wherein the module cover is arranged between the first fastening portion and the secon

Assignees

• Beckhoff Automation Gmbh

Inventors

• Brinkmann Rolf
• Bentfeld Lukas
• Neufeld Jörg

Classifications

• H02K9/22

  by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges · CPC title

• H02K9/227

  Heat sinks · CPC title

• H02K9/223

  Heat bridges · CPC title

• H02K41/031 Primary

  of the permanent magnet type · CPC title

• H02K5/18

  with ribs or fins for improving heat transfer · CPC title