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DE-102024210852-A1 - Stator for an electric machine

DE102024210852A1DE 102024210852 A1DE102024210852 A1DE 102024210852A1DE-102024210852-A1

Abstract

Stator (2) for an electric machine (1), comprising a stator base body (3) having at least two stator segments (4-7) arranged adjacent to each other in the circumferential direction, wherein a channel (8) is formed between the at least two stator segments (4-7) which is designed to guide temperature control medium, wherein a sealing device (9) is designed to seal the channel (8) radially inwards in the radial direction of the stator base body (3).

Inventors

  • Kim Führer
  • David Jonak

Assignees

  • ZF FRIEDRICHSHAFEN AG

Dates

Publication Date
20260513
Application Date
20241112

Claims (12)

  1. Stator (2) for an electric machine (1), comprising a stator base body (3) having at least two stator segments (4-7) arranged adjacent to each other in the circumferential direction, wherein a channel (8) is formed between the at least two stator segments (4-7) which is designed to guide temperature control medium, wherein a sealing device (9) is designed to seal the channel (8) radially inwards in the radial direction of the stator base body (3).
  2. Stator (2) after Claim 1 , characterized in that at least one electrical conductor element (11), in particular at least one hairpin conductor element (11), can be received or accommodated in the channel (8) or that the channel (8) is arranged separately, in particular radially outside to a conductor element receptacle (18) accommodating at least one electrical conductor element (11).
  3. Stator (2) after Claim 1 or 2 , characterized in that a sealing element (10) is arranged in the channel (8), in particular at a radially inner channel end section (15).
  4. Stator (2) after Claim 3 , characterized in that the sealing element (10) can be prestressed or is prestressed in the radial direction by at least one conductor element (11) and is designed to transmit the prestress force in the circumferential direction to the stator segments (4-7).
  5. Stator (2) after Claim 3 or 4 , characterized in that the sealing element (10) is bent in a radial direction in the direction of at least one conductor element (11) received in the channel (8), at least in an unloaded state.
  6. Stator (2) according to one of the preceding claims, characterized in that the sealing device (9) is an electrical insulating device (16), in particular insulating paper, includes or is designed as an electrical insulating device (16).
  7. Stator (2) according to one of the preceding claims, characterized in that the sealing device (9) comprises at least one sealing element (10), in particular a sealing ring, which surrounds a stator segment (4-7).
  8. Stator (2) after Claim 7 , characterized in that the at least one sealing element (10) is arranged in a circumferentially open groove in two circumferentially adjacent stator segments (4-7).
  9. Stator (2) according to one of the preceding claims, characterized in that the at least two stator segments (4-7) have circumferentially directed, in particular electromagnetically optimized, extensions (14) at a radially inner end region.
  10. Electrical machine (1) comprising at least one stator (2) according to one of the preceding claims.
  11. Drive train comprising at least one electric machine (1) according to the preceding claim and/or at least one stator (2) according to one of the Claims 1 until 9 .
  12. motor vehicle comprising a drive train according to the preceding claim and/or at least one electric machine (1) according to Claim 10 and/or at least one stator (2) after one of the Claims 1 until 9 .

Description

The invention relates to a stator for an electric machine. Electrical machines, in particular electric machines for motor vehicles, which have a stator and a rotor rotatably mounted relative to the stator, are generally known from the prior art. For cooling or temperature control of the stator, a temperature control medium is usually guided through at least one channel in the stator, so that heat exchange can take place between the temperature control medium and the stator, in particular a stator core or conductor elements of the stator. To achieve the most efficient temperature control, and in particular to cool the stator core as efficiently as possible during operation, it is advantageous to direct the temperature control fluid as close as possible to the points where heat is generated, especially near the conductor elements running within the stator core. However, it is essential to ensure that the temperature control fluid cannot enter the rotor chamber of the electric machine, which is bounded by the stator core. Specifically, the temperature control fluid should not enter any gap between the rotor, which is rotatably mounted within the stator core, and the inner wall or surface of the stator core. Specifically, stator bodies are known that are formed from a multitude of axially adjacent sheet metal laminations. A channel for guiding the temperature control fluid can run axially through the individual laminations and thus be closed. Another possibility is to form a canned tube, for example made of a composite material, and insert it into a stator opening in the stator body, so that the canned tube separates the rotor chamber from the stator chamber. The invention is based on the objective of providing an improved stator for an electric machine, in which, in particular, the guidance of the temperature control medium is improved. The problem is solved by a stator having the features of claim 1. Advantageous embodiments are the subject of the dependent claims. The invention relates to a stator for an electric machine. The electric machine can, in particular, be configured as a drive unit for a motor vehicle. For example, the electric machine can be part of a drive train for such a motor vehicle. The stator comprises a stator body having at least two stator segments arranged adjacent to each other in the circumferential direction. In contrast to the stator or stator body previously described with reference to the prior art, which is formed from axially adjacent sheet metal laminations, the stator body described herein is constructed from stator segments that extend axially, in particular continuously between the axial end faces of the stator body, and that are arranged adjacent to each other in the circumferential direction. The stator body can thus be understood as being made up of "individual teeth" that extend over the axial extent of the stator body and are arranged adjacent to each other in the circumferential direction, thereby forming the stator body. This means that a gap or interface is formed between each pair of stator segments in the circumferential direction, where the two stator segments touch or abut each other. The stator described herein is designed to have a channel between at least two stator segments for guiding a temperature control fluid. In other words, the temperature control fluid can be guided in a channel formed between the two stator segments, or between each pair of stator segments. This means that the channel can be bounded, at least partially, by one stator segment and at least partially by the other stator segment. The stator also features a sealing device designed to seal the channel radially inwards along the stator body. Temperature control fluid can thus be guided through this channel, particularly between the two stator segments or between any two stator segments. To prevent the temperature control fluid from escaping radially inwards from the stator body, the sealing device is provided, which seals the channel radially inwards, preventing the temperature control fluid from flowing radially inwards and thus from entering the gap or the rotor chamber. Advantageously, it is therefore possible to guide temperature control fluid through channels between the stator segments in the stator, which is constructed from the stator segments described, and thus achieve heat exchange or heat dissipation or heat input as close as possible to the point(s) where The heat is generated in order to be dissipated or transferred to the heat in order to warm it up. Generally, the term "tempering" encompasses both heating and cooling. Specifically, during the operation of an electric machine, heat can be generated by the electrical conductors running within the stator body, which can then be dissipated by the temperature control fluid. It is therefore advantageous to position the temperature control fluid as close as possible to the electrical conductors to ensure the most efficient heat diss