DE8803915U1 - Electric motor - Google Patents

Description

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COHAUSZ &

PATENTAN ¹ WALTSBURO

SCHUMANNSTR.ST D-4000 DÜSSELDORF 1 äeictoic Ipeiq 683346 · TiIiIn mn &Ggr;&Tgr;&idiagr;&eegr;&Pgr;&Tgr;&Igr; - "HocB586SI3 copd

PMBHMMMJE: OpMng. R KNAUF · DnA-fag. a a COHAUSZ - OoMng. a R WEHNER - Dt ret nat a REDIES

08 -.03.1938 - 2 - HC/ib 48071G B

4600 Dortmund-Münster 30

Electric motor

The invention relates to an electric motor, in particular for 10

a pump with a motor shaft onto which a rotor lamination package is fastened by compression, which has short-circuit rings on the outer end faces.

There are various designs for attaching a rotor package to a motor shaft. The shaft can have a cylindrical or conical knurled seat or a smooth cone. Adhesive processes, shafts with cylindrical press-fit tolerance sleeves between the shaft and rotor package as well as shrinking processes are also known.

It is also known that, in the case of centerless ground shafts, which have a constant shaft diameter throughout - which makes production much easier - a rotor package can be pushed onto the shaft with a small oversize and that the end plates can be secured to the shaft by pushing the end plates into place. However, the shaft can be damaged during the upsetting process. At the very least, stress peaks are to be expected at the upsetting points due to the tight fit of the plate. Particularly in the case of motor shafts made of brittle materials, e.g. ceramics,

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This immersion process and the subsequent stress progression in the shaft can lead to problems such as shaft cracking.

The object of the invention is to improve the design of an electric motor of the type mentioned above so that the fastening of the power transmission plate to the motor shaft does not damage it.

This object is achieved according to the invention in that the

Copper discs of the short-circuit ring reach to the shaft and are there compressed against the shaft.

The distortion of the rotor package thus takes place on the

short-circuit rings, so that the soft copper material forms the fastening to the shaft. With this design it is possible to work with lower pressing forces and the softness of the

short-circuit ring material also lower voltages in the

This means that, especially with ceramic shafts, there is a risk of shaft breakage during assembly or shaft bending or breakage during operation due to strong stresses caused by the

Rotor package, greatly reduced. This makes it particularly simple and easy to

assembly construction, which further does not lead to

Committee leads. 1 It is particularly advantageous if the shaft diameter

is consistent, as the production is particularly ■

is simplified.

1 i

An embodiment of the invention is shown in the drawing and is described in more detail below. It shows,

Figure 1 shows the state of the art technology in the form of a shaft of constant diameter with a rotor lamination package, the end plate of which is sprained and

Figure 2 a motor shaft constant

diameter with a rotor lead package, the short-circuit rings of which are sprained according to the invention.

A rotor package 3 made of numerous metal sheets is pushed onto a centerless ground motor shaft 1 of the same diameter as an electric motor, with the openings in the rotor sheets only slightly oversized compared to the shaft diameter. In contrast to the prior art according to Figure 1, in the design according to Figure 2 the copper disks 2 of the two end short-circuit rings are pulled down to the surface of the shaft, so that the openings in these copper disks 2 are approximately the same size as those in the rotor sheets.

Around the openings of the copper disks 2, the copper material is compressed against the shaft 1, so that the copper material forms the fastening to the shaft . Bin 3Q compressing the sheets of the rotor package is not necessary.

Claims (2)

COHAÜSZ'.& F-LORACK PATENT ATTORNEY OFFICE SCHUMANNSTR. 87 0-400ODUSSBLOORFi gg-nt 683348 · TiIfIa. HCH) 6790871 - "Wee 8586513 cop d IMENUNWUJE: BpUng. W COHAUSZ · »pWog. R KNAUF · ttpl-lng. K B. COHAUSZ · Opt-ta» O. H. WERNER - German version of the RED-ES 08.03.1938 - 1 - HC/ib 48071G C speech 1. Electric motor, in particular for a pump, with a motor shaft on which a rotor laminated core is fastened by compression, which carries short-circuit rings on the outer end faces, characterized in that the copper disks (2) of the short-circuit ring extend to the shaft (1) and are compressed against the shaft there. 2. Electric motor according to claim 1, characterized characterized in that the diameter of the shaft (1) is constant.