Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-04-05
1992-05-12
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 42, 310 54, 310 88, 310 90, 310 91, 310258, H02K 500
Patent
active
051131030
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an electric motor having a housing which encloses it tightly and consists of a stainless steel sheet jacket, a stator maintained integrally in rotation in the housing, a shaft, at least one end of which is passed out of the housing, two centring pieces arranged on both sides of the stator, which abut a stop at the end faces of the stator and in which the shaft is mounted directly or indirectly.
In a known electric motor of the type stated (DE-PS 2,904,384) all the parts which form the housing consist of relatively thin sheet metal. Screw threads which fit into the corresponding screw thread of the next housing part are turned or curled into the ends of housing parts to be mutually connected.
However, thin sheet metal housings are inadequate for large motors, particularly if the housings are also to be used in underwear operations. When the motor housings are connected to heavy pumps considerable mechanical tensile, compressive and flexural forces occur, which have to be absorbed solely by the housing. Moreover, the housings have to be protected from increased internal pressure and external pressure. Thin sheet steel housings are not suitable for this purpose.
The underlying object of the invention is to produce an electric motor, the housing of which, whilst retaining the advantage of the known housings, can withstand high mechanical stresses and moreover can be produced for a small outlay.
This object is achieved according to the invention in that the centring pieces are of thick-walled construction, that the outside diameter of the centring pieces on the side facing the stator is greater than that of the stator, that the centring pieces embraces the stator positively at its end faces, that the outer end sections of the centring pieces remote from the stator exhibit at least one constriction, and that the sheet metal jacket closely abuts the region of the stator which is exposed between the two centring pieces, and the two centring pieces, at least into the constriction.
The thick-walled centring pieces, which preferably consist of cast iron and which engage both sides of the stator give the motor the same mechanical strength and load capacity in the critical regions as for a motor having a continuous stable cast housing. The motor is moreover covered with an external layer of stainless sheet steel, so that it is protected from corrosion and may also be immersed in corrosive liquids for example.
Due to the particular construction of the centring pieces it is possible for the sheet metal jacket when applied to fix the components of the motor relatively to each other without additional auxiliary means.
The constriction of the centring pieces may be formed by the outer end sections of the centring pieces being reduced in diameter. In this case the sheet metal jacket may be applied to the stator and the centring pieces by the pressure rolling process, so that the sheet metal jacket closely abuts the stator and the centring pieces along its total length, so that good heat transfer exists from the inside outwards and intensive heat dissipation is thus ensured.
Instead of the pressure rolling process, the calibration process or swaging process may also be used to apply the jacket on to the stator and the centring pieces.
The two end faces of the motor may be sealed by end caps made of stainless sheet steel which embrace the sheet metal jacket tightly. For sealing purposes the sheet metal caps exhibit an outward pressed all-round bead, into which an O-ring is inserted, in their section which embraces the sheet metal jacket.
Separate bearing brackets may be inserted into the centring pieces to mount the shaft. Sealing pieces may be screwed onto the outward facing end faces of thee centring pieces, the bearing bracket being fixed between shoulders on the centring pieces on the one hand and the sealing pieces on the other hand.
However, it is also possible alternatively for the centring pieces to be integral with the bearing brackets.
In another exemplary embodiment the constriction of the c
REFERENCES:
patent: 2462204 (1949-02-01), Ludwig
patent: 3143897 (1964-08-01), Kohn
patent: 3289018 (1966-11-01), Schaefer
patent: 3382383 (1968-05-01), Turk
patent: 3433990 (1969-03-01), Stone
patent: 3707038 (1972-12-01), Hallerback
patent: 3760209 (1973-09-01), Hult
patent: 3873861 (1975-03-01), Halm
patent: 4780953 (1988-11-01), Wheeler
Blum Albert
Kramer Gunter
LandOfFree
Electric motor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electric motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2426813