Search

DE-102024132759-A1 - Stator lamination stack arrangement for a stator of an electric drive machine

DE102024132759A1DE 102024132759 A1DE102024132759 A1DE 102024132759A1DE-102024132759-A1

Abstract

The invention relates to a stator lamination stack arrangement for a stator of an electric drive machine of a motor vehicle, comprising a stator lamination stack with a plurality of stator laminations forming a stator outer shell which has several spaced-apart recesses, wherein a circumferential sealing means is arranged in at least two of the recesses.

Inventors

  • Jens Richter
  • Juergen Huettinger

Assignees

  • BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT

Dates

Publication Date
20260513
Application Date
20241111

Claims (9)

  1. Stator lamination stack arrangement (2) for a stator of an electric drive machine (1) of a motor vehicle, comprising - a stator lamination stack with a plurality of stator laminations forming a stator outer shell (13) which has several spaced-apart recesses (15), characterized in that a circumferential sealing means is arranged in at least two of the recesses.
  2. Stator lamination stack arrangement according to Claim 1 , characterized in that at least the recesses which are arranged longitudinally axially between those recesses in which a sealing agent is arranged are designed to receive a coolant.
  3. Stator lamination stack arrangement according to one of the preceding claims, characterized in that the spaced-apart recesses are formed by alternately arranging one or more stator laminations (3a) with a maximum diameter of the stator shell and one or more stator laminations (3b) with a recess diameter of the stator shell with respect to an axial extent (A) of the stator.
  4. Electric drive machine (1) for a motor vehicle, comprising a stator with a stator lamination stack arrangement (2) according to one of the preceding claims and a machine housing (4) with a housing cover (8) and a housing pot (6) which has an inner housing shell (7) against which the stator lamination stack arrangement radially abuts by means of the sealing means.
  5. Electric drive motor (1) according to Claim 4 , characterized in that the stator lamination stack arrangement is radially supported on the inner housing shell (7) by means of the sealing means, wherein a circumferential channel (28) [for receiving a coolant] with a radial width (B) is formed between the outer stator shell (13) and the inner housing shell (7).
  6. Electric drive motor (1) according to Claim 4 , characterized in that the stator lamination stack arrangement is radially supported on the inner housing shell (7) by means of the stator laminations (3a) with the maximum diameter of the stator shell.
  7. Electric drive motor (1) according to Claim 6 , characterized by a housing base seal (24) for sealing the recesses on the stator outer shell against the housing base, and/or a housing cover seal (26) for sealing the recesses on the stator outer shell against the housing cover.
  8. Method for assembling a stator lamination stack of an electric motor vehicle, comprising: - providing recesses (15) in an outer contour (13) of at least a part of the stator laminations (3b), - arranging a plurality of stator laminations (3a, 3b) relative to each other to form a stator lamination stack (2), - applying a sealing agent in each of the two longitudinally outermost recesses of the stator lamination stack.
  9. Procedure according to Claim 8 , characterized by the steps: - Inserting the stator lamination stack assembly into a housing pot (6) of the machine housing until it reaches a stop, - Placing and fixing a housing cover (8) onto the housing pot.

Description

The invention relates to a stator lamination stack arrangement for a stator of an electric drive motor of a motor vehicle and a method for its assembly. In particular, a cooling arrangement for the stator is provided. Various methods for cooling stators of electrical machines are known from the prior art: for example, shell cooling of stators in which cooling channels are incorporated into the housing; or shell cooling in which a stator sleeve with cooling channel walls is provided, which are formed on the sleeve, with the cooling channels resulting from the inner shell of the housing. However, the established solutions with cooling channels in the housing or with stator sleeves have several disadvantages. Firstly, the manufacturing of the housing or stator sleeve is complex and expensive. Secondly, the minimum wall thicknesses required for mechanical strength and sealing necessitate additional installation space and increase weight. Furthermore, the wall thicknesses and air gaps at component boundaries create thermal contact resistances that impair the cooling effect. Based on this prior art, the invention aims to provide an improved cooling arrangement for the stator of an electric drive motor that enables efficient cooling while avoiding or at least reducing the aforementioned disadvantages of the prior art. In particular, a cost-effective and space-optimized solution is to be created in which thermal contact resistances are minimized. Each of the independent claims, with its features, defines an object that solves this problem. The dependent claims relate to advantageous embodiments of the invention. According to one aspect, a stator lamination stack arrangement is proposed for the stator of an electric drive motor of a motor vehicle. The stator lamination stack arrangement comprises a stator lamination stack with a plurality of stator laminations forming an outer stator shell with several spaced-apart recesses. A cooling jacket with a liquid coolant is not implemented—as in known solutions—by means of an additional or cast-on component (e.g., stator support), but directly via the recesses in the outer shell of the stator lamination stack. In at least two of the recesses, a circumferentially circulating sealant is arranged, in particular, contained. Each sealant is designed, according to different embodiments, with an O-ring and/or a sealing ring with a different cross-section (for example, rectangular, square, oval, or freely shaped). The sealant is, in particular, formed in one piece and/or made of a plastic or another material suitable due to its macroelasticity. This design ensures a reliable seal between the cooling channels and the machine interior, eliminating the need for separate, additional seals between the stator and housing. The seals can be cost-effectively pre-installed directly into the recesses. According to one embodiment, at least the recesses arranged longitudinally between those recesses containing a sealing material are designed to receive a coolant. In this way, the recesses between the recesses containing the sealing material can be used as cooling channels for a coolant if, according to one embodiment, they form a suitable cooling channel geometry, in particular a combination of circumferential and axial channels. The sealing with the circumferential sealing material creates a reliable cooling circuit in the stator, whereby the coolant can be routed directly past the stator lamination stack without additional components. According to a further embodiment, the spaced-apart recesses are shaped such that, with respect to the axial extent of the stator, one or more stator laminations with a maximum diameter equal to that of the stator shell and one or more stator laminations with a recess diameter equal to that of the stator shell are arranged alternately. This alternating arrangement of stator laminations with different diameters allows the recesses to be formed easily without requiring subsequent machining of the stator lamination stack. The recesses can be integrated during the manufacturing of the stator lamination stack itself. According to one aspect, an electric drive motor for a motor vehicle comprises a stator with a stator lamination stack arrangement according to an embodiment of the invention, as well as a machine housing with a housing cover and a housing shell, which has an inner housing shell. The stator lamination stack arrangement is at least radially attached to the housing shell by means of sealing means. The stator lamination stack assembly with integrated sealing elements can be positioned directly on the inner casing, thus achieving a reliable seal to the casing without the need for additional seals between the stator and the casing. According to one embodiment, the stator lamination stack assembly is supported at least radially by means of the sealing elements against the inner housing shell, particularly for force transmission, wherein a circumferential chann