Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1993-04-22
1995-03-28
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 42, 310216, 310217, H02K 112
Patent
active
054020280
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention proceeds from a stator for an electric machine, in particular a small-power electric motor.
In a known stator of this type for a bipolar low-power motor, the two laminate stack parts are constructed symmetrically and each carry a magnet pole. Extending from each magnet pole are two limbs which form the magnetic return path and abut in the plane of symmetry of the stator via reciprocal V-shaped centering devices. After mounting the stator winding, which is subdivided into two field coils, on one of the magnet poles in each case, the two laminate stack parts are joined together in the V-shaped centring devices and welded along the joint in the plane of symmetry. The welding operation represents, on the one hand, an important cost factor in the production of the stator, and on the other hand has the disadvantage that the welded joint forms a bridge among the individual mutually insulated laminations, and this leads to magnetic flux loss and thus to power loss.
SUMMARY OF THE INVENTION
According to the present invention, the stator for the electric machine, particularly a low-power motor, has a two-part stator laminate stack for mounting a stator winding consisting of two laminated stack parts having a self-centering device. The laminated stack parts each consist of a plurality of laminations and the self-centering device consists of a plurality of locking joints, each of the locking joints consisting of a tab having a first locking element integrally formed on one lamination and a receptacle with a second locking element recessed in another lamination connected to the lamination having the tab projecting into the receptacle in a plug-in direction. The first locking elements and second locking elements are formed so that the first locking elements are gripped by the second locking elements nearly transversely to the respective plug-in directions so that a plurality of receptacles engaged with tabs of the laminations bearing against one another in an axial direction are permanently deformed transversely to the plug-in direction so that contours of the receptacles so engaged project beyond contours of nondeformed receptacles in adjacent laminations.
The stator according to the invention has the advantage of a cost-effective production without being attended by the former disadvantages. The locking connection is performed via the individual laminations and can be realised simply using stamping technology. No additional parts or additional materials are required for joining the two laminate stack parts.
The stator is mounted by applying to the two laminate stack parts, which have been previously abutted at the joint, a force which is directed in the joining direction of the tabs and receptacles. During the joining operation, at least one of the two limbs of the laminations enclosing the receptacle is pressed outwards by the locking profile projecting laterally over the tab, and after the second locking element, which is constructed on this limb, in the receptacle has been gripped from behind by the first locking element on the tab springs back into its original position. The locking is thus performed, and the two laminate stack parts are joined inseparably to one another, The locking joint can be disconnected once again in the original joining direction only by destroying the workpiece.
Advantageous developments and improvements of the stator are possible by means of further measures.
In accordance with a preferred embodiment of the invention, the locking elements are constructed in such a way that the gripping from behind of the second locking profile in the receptacle by the first locking element on the tab is performed with pretensioning. In this way, the two laminations, belonging in each case to one laminate stack part, bear against one another in a force-locked fashion, and this is advantageous for the stability of the stator.
Depending on the design of the stator (symmetrical with two thin limbs or asymmetrical with only one relatively thick limb between the mag
REFERENCES:
patent: 2487258 (1949-11-01), Morris
patent: 2712084 (1955-06-01), Bridenbaugh
patent: 3443137 (1969-05-01), McElroy
patent: 3502922 (1970-03-01), Welker
patent: 3694903 (1972-10-01), Deming
patent: 3826941 (1974-07-01), Folmar
Fay Hans
Koeber Karl-Ernst
Radke Siegmund
Robert & Bosch GmbH
Skudy R.
Striker Michael J.
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