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CN-122001129-A - Stator of electric machine

CN122001129ACN 122001129 ACN122001129 ACN 122001129ACN-122001129-A

Abstract

The invention relates to a stator (1) of an electric machine, comprising a stator stack (2) formed by a plurality of stator plates (3) arranged axially in relation to one another. Wherein the receptacles (6) of the stator stack are formed in the stator stack at least in sections spaced apart from one another in the circumferential direction (5) of the stator via recesses (4) in the stator sheets which are axially aligned with one another and at least one winding wire (7) of a stator winding (8) of the stator is respectively received in the respective receptacles. The receptacles here each have at least one axially extending groove section (9) with a groove opening (10), wherein the groove opening (10) extends radially inward through the stator stack (2) in such a way that the groove sections are open. Furthermore, the receptacles (6) each have at least one holding section (11), via which holding section (11) the insulating inserts (12) arranged in the respective receptacle (6) are radially fixed in the receptacle (6).

Inventors

  • J-N. Weber
  • S. plokhov
  • J. KOCH

Assignees

  • 大众汽车股份公司

Dates

Publication Date
20260508
Application Date
20251105
Priority Date
20241107

Claims (10)

  1. 1. Stator (1) of an electric machine (26), with a stator stack (2) formed of a plurality of stator plates (3) arranged axially in relation to one another, wherein in the stator stack (2) via recesses (4) in the stator plates (3) aligned axially in relation to one another are formed in the circumferential direction (5) of the stator (1) spaced apart from one another, axially at least in sections across the receptacle (6) of the stator stack (2), and at least one winding wire (7) of a stator winding (8) of the stator (1) is accommodated in the respective receptacle (6), respectively, characterized in that the receptacle (6) has at least one axially extending groove section (9) with a groove opening (10), wherein the groove opening (10) is radially inward of the stator stack (2) and has at least one retaining section (11), respectively, and in that an insulating insert (12) arranged in the respective receptacle (6) is fastened in the receptacle (6) via the retaining section (6).
  2. 2. Stator (1) according to claim 1, characterized in that the respective holding section (11) of the receptacle (6) is shaped radially inside in such a way that it is closed via a bridge (13) shaped in the stator stack (2) and extending in the circumferential direction (5).
  3. 3. Stator (1) according to claim 1 or 2, characterized in that the respective holding section (11) of the receptacle (6) is shaped radially inside in a manner that is only partially closed via a partial bridge (14) extending in the circumferential direction (5), wherein at least the partial bridge (14) encloses a right angle with a radially extending receptacle side wall (15).
  4. 4. Stator (1) according to at least one of the preceding claims, characterized in that the groove opening width (16) of the groove opening (10) of a groove section (9) corresponds to the groove width (17) of the groove section (9).
  5. 5. Stator (1) according to at least one of the preceding claims, characterized in that a holding section (11) is implemented at a respective axial end (18) of the stator stack (2).
  6. 6. Stator (1) according to at least one of the preceding claims, characterized in that an axial end (18) facing away from the stator stack (2) is configured with at least one holding section (11) axially along the stator stack (2).
  7. 7. Stator (1) according to at least one of the preceding claims, characterized in that the holding section (11) of the receptacle (6) of the stator stack (2) is formed by way of at least one stator plate (3) embodied as a holding plate (19), on whose recesses (4) at least in sections the holding section (11) are formed radially inside with holding means (20) extending in the circumferential direction (5) and/or in the circumferential direction (5).
  8. 8. Stator (1) according to at least one of the preceding claims, characterized in that the retaining means (20) are bridging elements (21) which completely close the receptacles (6) of the retaining tabs (19) and which configure at least one axial section of the bridging portion (13) of the retaining section (11).
  9. 9. Stator (1) according to at least one of the preceding claims, characterized in that the retaining means (20) are partial bridging elements (22) which only partially close the receptacles (6) of the retaining tabs (19) and which form at least one axial section of the partial bridging (14) of the retaining section (11).
  10. 10. Stator (1) according to at least one of the preceding claims, characterized in that the groove sections (9) of the receptacle (6) of the stator stack (2) are formed by at least two, preferably more, mutually aligned stator sheets (3) embodied as groove sheets (23), which at least in sections form the recesses (4) of the groove sections (9) of the receptacle (6) radially inside with openings (24) which form the axial sections of the groove openings (10).

Description

Stator of electric machine Technical Field The invention relates to a stator of an electric machine, comprising a stator stack formed by a plurality of stator plates (Statorlamellen, sometimes referred to as stator foils) arranged axially in relation to one another, wherein receptacles are formed in the stator stack, which are spaced apart from one another in the circumferential direction of the stator, axially at least in sections across the stator stack, via recesses in the stator plates that are axially aligned with one another. At least one winding wire of the stator winding of the stator is accommodated in each of the respective receptacles. Background Various embodiments of stators for electric machines, particularly electric motors (Elektromotoren, sometimes referred to as electric motors), are known in the art. In this way, DE 10 2021 112 931 A1 discloses a stator of an electric machine, which consists of a stator packet made from a sheet metal blank. The sheet metal blanks arranged one over the entire axial length of the stator packet have recesses which, viewed in a cross section extending in the radial direction of the stator, are closed radially inside via bridging portions. The stator windings are disposed in the recesses of the stator plate package. The bridge, which radially inwardly closes the respective recess, is plastically deformed in such a way that a mechanical stress is introduced therein. US 2003/0 201 687 A1 also shows a stator of an electric machine with a stator plate package and stator windings accommodated in recesses of the stator plate package. The recesses are also configured such that they are closed radially inside via the bridge, as seen in each case in a cross section extending in the radial direction of the stator, in the sheet metal blank which is arranged one on top of the other over the entire axial length of the stator packet. However, such complete closure of the grooves of the stator negatively affects the magnetic properties thereof and thus the efficiency of an electrical machine with such a stator. Furthermore, in electrical machines, in particular in electric motors, electrical insulation of the electrical conductors, which engage in particular in the grooves of the stator stack of the stator and/or are embodied, for example, as hair pins, is usually carried out with respect to the stator stack via a groove insulation paper. The slot insulating paper here separates the conductors from the metal slots in order to prevent short circuits between the conductors and the stator stack. In addition to electrical insulation, the fluted insulation paper also provides mechanical protection. It protects the conductor from sharp edges or accidental contact with metal surfaces, which may damage the conductor. However, the use of groove insulation paper in an electric machine has some drawbacks which can impair not only the electrical insulation but also the mechanical stability and thus the reliability of the electric machine. The problem here is that the conductor slides in the direction of the air gap or the groove seam. If the conductors located in the grooves of the stator move in the direction of the air gap during operation of the motor due to mechanical and/or thermal loading, the air path (Luftstecke, sometimes referred to as the air distance) provided between the rotor and the stator winding heads drops. This can lead to dangerous electrical disturbances, or even short circuits, and impair the efficiency of the motor. In extreme cases, even mechanical contact between the components can occur, which results in severe damage to the motor up to failure. Another problem arises from the rupture of the groove insulation paper, especially at its overlap with the inner side of the groove and/or the air gap. When the conductors, which are embodied in particular as hairpin conductors, are engaged into the grooves, they press radially against the groove insulation paper, which causes the groove insulation paper to break inwards, and the insulation effect at these locations is no longer fully ensured. The rupture furthermore leads to the further negative effect that, on the one hand, the acoustic performance of the motor is thereby impaired, since the air turbulence in the air gap is influenced by the geometric change of the groove insulation paper and, if possible, its penetration into the air gap. This may lead to undesirable noise during operation of the motor. On the other hand, cracking of the insulating paper can interfere with resin impregnation upon impregnation of the conductor, which can result in not all areas of the conductor being properly impregnated with insulating resin. This increases the risk of rejects, since the insufficiently impregnated windings are mechanically less stable and the electrical insulation is impaired. There is an additional risk on the end side that oil can intrude into the air gap, as the groove seam provides a large opening. This compromis