DE102008001072A1 - Stator fastening by means of clamping plates - Google Patents

Abstract

In a device for fastening a stator (3) in an opening (11) of a machine housing (2), the invention provides that on the machine housing (2) several, in particular three, clamping plates (13) are rotationally fixed, each with its radially to inside the opening (11) of the machine housing (2) projecting free plate end (18) behind the stator (3) in the insertion direction of the stator (3) that the stator (3) by the clamping plates (13) against a shoulder (11) of the machine housing (2) is axially clamped and that the clamping plates (13) each on its the stator (3) facing bottom one or more projections (21) and the front side of the machine housing (2) corresponding recesses (22) or vice versa, wherein engage the projections (21) in the recesses (22) and thereby fix the stator (3) in the machine housing (2) in the tangential and radial directions.

Description

State of the art

The Invention is based on a fastening device for a stator according to the preamble of claim 1.

Such a fastening device is for example by the DE 103 32 957 A1 known.

at this known fastening device are on the inner shell circumference of the housing inwardly projecting longitudinal beads, over the entire length of the cylindrical part of the housing, formed. The stator is going through held these protruding longitudinal beads of the housing, wherein the longitudinal corrugations act as a spring element and the Clamp the stator in the housing. The clamping force is included so large that the stator is not relative to the housing twist or move in the axial direction. The longitudinal beads are the same distance from each other on the circumference of the housing spaced so that a uniform clamping force is exerted on the stator. Through this design of the housing, the stator without sticking in the housing be attached.

Disclosure of the invention

According to the invention proposed the stator by means of two or more clamping plates Both axially clamp in the machine housing as well to fix in tangential and radial direction.

• – kostengünstige Lösung
• – Fixierung der axialen wie radialen Bewegung des Stators mit demselben Bauteil (Klemmplatte)
• – Skalierbarkeit durch Bauteilwiederholung am Umfang
• – Lösbarkeit/Trennbarkeit der Materialien (Umweltschutzanforderung, Serviceanforderungen)
• – minimaler Einfluss auf magnetische Randbedingungen (minimale Störfelder)
• – Vermeidung von unterschiedlichen Materialpassungen, wie z. B. Aluminium in Stahl oder umgekehrt
• – Standardisierung von Bauteilen (Bauteilclusterung) möglich
• – Aufweitung der Toleranzen (Je feiner die Toleranzen desto höher die Kosten)

Advantages of the fastening device according to the invention are:

• - cost-effective solution
• Fixation of the axial and radial movement of the stator with the same component (clamping plate)
• - Scalability through component repetition on the circumference
• - solubility / separability of materials (environmental protection requirement, service requirements)
• - minimal influence on magnetic boundary conditions (minimal interference fields)
• - Avoidance of different material adjustments, such. As aluminum in steel or vice versa
• - Standardization of components (component clustering) possible
• - widening of tolerances (the finer the tolerances the higher the costs)

Further Advantages and advantageous embodiments of the subject invention are the description, the drawing and the claims removable.

Short description of the drawing

Two Embodiments of the invention Fastening device are shown in the drawing and in the following description. The features shown in the figures are purely schematic and not to scale. It shows:

1 a schematic longitudinal sectional view of an electric machine with a stator according to the invention by means of clamping plates according to the section line II in 2 ;

2 a schematic plan view of the electrical machine of 1 ;

3 the stator inserted into the machine housing without the clamping plate in an enlarged plan view according to the detail III in 2 ;

4 the stator according to the invention in an enlarged longitudinal sectional view according to the detail IV in 1 ;

5 the top ( 5a ) and the underside ( 5b ) a modified clamping plate; and

6 the stator used in the machine housing without the in 5 shown clamping plate in a representation analogous to 3 ,

embodiments the invention

The following is with reference to the 1 to 4 an electric machine with a stator mounting according to the present invention is described. The electric machine is an EC motor used in a vehicle. 1 is a sectional view taken along the line II in FIG 2 , and the 3 and 4 are enlarged views according to detail III in FIG 2 or the detail IV in 1 ,

In the 1 and 2 shown electric machine 1 includes a cylindrical machine housing 2 , a stator mounted therein 3 , a rotor shaft 4 with a permanent magnet arranged thereon 5 and an electrical plug connection, not shown. The machine housing 2 is cup-shaped and closed at its open side with a lid member, not shown. The rotor shaft 4 is at both ends in two camps 6 stored, which at the open side of the machine housing 2 provided bearings 6 by means of a carrier part 7 on the machine housing 2 is attached. The torque of the rotor shaft 4 can have a gearing 8th at the open side of the machine housing 2 facing the end of the rotor shaft 4 be removed. The stator 3 around summarizes in a known manner a sleeve-shaped stator housing 9 , a stator blade set with windings fixed therein 10 and a sensor (not shown).

The stator 3 is in the circular opening 11 of the machine housing 2 inserted axially until the stator housing 9 on a ring heel 12 of the machine housing 2 is applied. Instead of a circumferential annular paragraph 12 can the machine housing 2 also have several non-rotating attacks. The attachment of the stator 3 in the machine housing 2 done by three trained here as spring plates clamping plates 13 on the machine housing 2 are bolted and thereby the stator housing 9 at the ring heel 12 tighten axially. The three clamping plates 13 are in the circumferential direction of the machine housing 2 each equidistant from each other.

Each clamp 13 is in a recess 14 ( 3 ) of the machine housing 2 perfectly fitting between the two side walls 15 the recess 14 used and thus fixed against rotation. The clamping plate 13 is about a screw 17 at the front of the machine housing 2 screwed tight and so clamped with her free plate end 18 which is radially inward into the opening 11 of the machine housing 2 protrudes and the stator housing 9 in the insertion direction of the stator 3 engages behind, the stator housing 9 to the ring heel 12 axially fixed. The screw 17 passes through a hole 19 ( 4 ) in the clamping plate 13 and is in a threaded hole 20 of the machine housing 2 screwed.

As in 4 shown are in the free plate end 18 on the stator housing 9 facing bottom two circumferentially spaced point or dome-shaped projections 21 stamped into corresponding recesses 22 in the front of the machine housing 2 engage and so the stator housing 9 in the machine housing 2 around the rotor axis 16 ( 1 ), ie fix in the tangential direction, as well as in the radial direction.

At the in 5 and 6 shown modification is in the clamping plate 13 a single line-shaped projection 21 imprinted in a corresponding linear recess 22 in the front of the machine housing 2 engages and so the stator housing 9 in the machine housing 2 fixed in tangential and radial directions.

In other embodiments of the invention, not shown, the projections on the machine housing 2 and the corresponding recesses provided on the clamping plates.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10332957 A1 [0002]

Claims (7)

Device for fastening a stator ( 3 ) in an opening ( 11 ) of a machine housing ( 2 ), characterized in that on the machine housing ( 2 ) several, in particular three clamping plates ( 13 ) are rotationally fixed, each with its radially inward into the opening ( 11 ) of the machine housing ( 2 ) projecting free plate end ( 18 ) the stator ( 3 ) in the insertion direction of the stator ( 3 ) that the stator ( 3 ) through the clamping plates ( 13 ) against a paragraph ( 11 ) of the machine housing ( 2 ) is axially clamped, and that the clamping plates ( 13 ) each at its the stator ( 3 ) facing bottom one or more projections ( 21 ) and the front side of the machine housing ( 2 ) corresponding recesses ( 22 ) or vice versa, wherein the projections ( 21 ) in the recesses ( 22 ) and thereby the stator ( 3 ) in the machine housing ( 2 ) in the tangential and radial directions. Fastening device according to claim 1, characterized in that the clamping plates ( 13 ) in the circumferential direction of the machine housing ( 2 ) are each equidistantly spaced from each other. Fastening device according to claim 1 or 2, characterized in that the clamping plates ( 13 ) in each case in a recess ( 14 ) of the machine housing ( 2 ) fit exactly between the two side walls ( 15 ) of the recess ( 14 ) are arranged. Fastening device according to one of the preceding claims, characterized in that the clamping plates ( 13 ) by means of screws ( 17 ) on the machine housing ( 2 ) are attached. Fastening device according to one of the preceding claims, characterized in that the projections ( 21 ) in the clamping plates ( 13 ) are coined. Fastening device according to one of the preceding claims, characterized in that the projections ( 19 ) of the clamping plates ( 13 ) are formed point or line-shaped. Fastening device according to one of the preceding claims, characterized in that the recesses ( 22 ) of the machine housing ( 2 ) Negative forms of the projections ( 21 ) of the clamping plates ( 13 ) or vice versa.