Method for the production of a stator and stator produced according thereto

Abstract

Disclosed is a method for the production of a stator core (20)for an electric machine, wherein a substantially rectangular packet of lamellae (40) is initially formed from strip-shaped lamellae (21); said packet is transformed and curved into an annular shape in one of the subsequent steps, having an axial direction (a) corresponding to the cylinder axis (z), said annular shape comprising axial front surfaces (46). The annular packet of lamellae (40) is at least partially plastically deformed at points on the axial front surfaces (46) in an axial direction (a) in one of the subsequent steps. A stator for an electric machine, particularly a generator for motor vehicles, is also provided. Said stator consists of a stator iron in the form of curved, strip-shaped lamellae (21), comprising axial front surfaces (46). The axial length of the inner diameter of the stator iron is greater than that of the outer diameter.

Description

technical field

[0001] The invention relates to a manufacturing method of a stator and a stator manufactured by the method. Background technique

[0002] WO 01 / 54254 A1 discloses a method of manufacturing a stator for an electrical machine, in particular a generator for an automobile. For this purpose, an essentially cuboid-shaped sheet pack is first produced from strip-shaped sheets, which in a subsequent step is shaped into a ring shape by bending around a circular axis. The ring shape of the stator or stator core has two axial end faces. It has been established that a stator or stator core of this type, which is axially clamped between two end shields via the axial end faces, has greater axial elasticity and flexibility. This flexibility leads to loose fastening elements, such as bolts, which are used to clamp the stator between the endshields, or must be able to withstand high loads, which has an impact on the dimensions. The arrangement of these bolts on the outer ci...

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