Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-09-30
2001-05-08
Mullins, Burton (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S087000, C310S254100, C310S179000, C310S049540, C310S086000, C310S089000, C242S433000, C417S321000
Reexamination Certificate
active
06229240
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to split-tube or can motor. More particularly this invention concerns a direct-current motor of the type used in a motor vehicle to drive the cooling fan or coolant pump.
BACKGROUND OF THE INVENTION
In a standard can or split-tube motor the stator windings are supported on and lie against the outer surface of the split tube or can. Normally as described in German 197 05 974 or in copending application Ser. No. 09/1396,108 the windings are carried on special supports that in turn are fitted to the can. These winding supports are therefore separate parts that add additional costs to the assembly and reduce the efficiency in the medium- and low-load applications.
In German patent document 44 38 132 it was suggested that the stator windings lie directly against the outer surface of the can. Installing such windings is quite difficult and expensive, and there is the danger that they might shift.
German patent document 1,222,159 describes a split-tube motor which is either provided with a pad or plate stack serving as winding support. This structure is also a part separate from the can so that it has the above-given disadvantages.
OBJECTS OF THE INVENTION
It is therefore an object of the present invention to provide an improved split-tube or can motor.
Another object is the provision of such an improved split-tube or can motor which overcomes the above-given disadvantages, that is which is simpler in construction than the known such motors and where the stator windings are solidly held in place.
SUMMARY OF THE INVENTION
A motor has according to the invention a rotor rotatable about an axis, a can surrounding the rotor and having an outer surface, a plurality of outwardly projecting stator supports fixed on the outer surface, and respective stator windings mounted directly on the stator supports.
This construction is extremely robust, inexpensive, and compact. The stator windings are solidly mounted on the can so they cannot shift from vibration or the torques encountered in normal use. The can with the stator forms a subassembly that greatly simplifies manufacture of the motor. Such a motor can be used in a wet or dry installation, that is the rotor can be lubricated and cooled by a liquid it is serving to pump.
The stator supports according to the invention project radially of the axis. This greatly eases mounting the stator windings in or around them.
Normally in accordance with the invention there are at least three and at most twelve such stator supports and they are angularly equispaced about the axis. In a standard motor four such supports spaced apart by 90° are used.
The stator supports can be stubs or cylindrically tubular. In the latter case they are outwardly cup shaped and contain at least part of the respective windings. Thus the windings can be formed directly on the supports of copper wire so that there is no need to bake on a subsequent lacquer coating.
The stator supports are according to the invention unitary with the can. They can just be molded with the normally plastic can although it is within the cope of this invention for them to be integrally mounted on the can, by welding or adhesive.
The motor according to the invention can be an electronically commutated direct-current motor or an asynchronous motor.
In accordance with the invention a contact support provided with terminals, e.g. of the mag-mate type, connected to the stator windings is mounted on the can and can in fact be unitarily formed with or integral with it. The windings are partially supported on the contact support. Thus there is no need for a separate terminal block. The can has a closed end supporting the contact support.
The motor further has according to the invention a fluid impeller carried directly on the rotor and a housing forming a fluid inlet and a fluid outlet together forming a fluid passage in which the impeller lies. The fluid can be water or air. In the former application the motor of this invention is ideally suited for use in a motor vehicle, for instance as a coolant pump or fan drive.
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patent: 5997261 (1999-12-01), Kershaw et al.
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patent: 240970 (1995-06-01), None
patent: 4404235 (1995-05-01), None
patent: 195 18 215 (1995-11-01), None
patent: 1222159 (1996-08-01), None
patent: 732794 (1996-09-01), None
Dreihaus Uwe
Fabricius Ingo
Kech Hansjurgen
Dubno Herbert
Mullins Burton
Wilford Andrew
Wilo GmbH
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