Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1987-06-12
1990-11-27
Budd, Mark O.
Electrical generator or motor structure
Dynamoelectric
Rotary
310180, H02K 112
Patent
active
049738739
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a DC electric machine. Numerous electric machines comprising a wave winding are already known. However, because of the two winding ends resulting from of the wave winding, they have the disadvantage of having a greater constructional length than electric machines comprising an exciting winding formed from individual coils, each of which is assigned to a pole. Also, wave windings have a greater average winding length than the corresponding windings formed from coils. However, wave windings have an advantage over windings which are composed of individual coils in that they are substantially less costly to produce because they require no high-cost connecting and wiring steps.
SUMMARY OF THE INVENTION
The invention has the object of providing an electric machine of the type mentioned above which machine ensures less work material to be used and lower assembly costs and has a shortened constructional length, so that it is also suitable for cranking devices for installing in available spaces in motor vehicles, which spaces are becoming increasingly smaller.
Compared to the known electric machines, it is advantageous that only by means of pairs of poles which are offset relative to one another in the direction of the longitudinal axis of the housing, and, accordingly, likewise in the longitudinal direction, relative to the armature of the electric machine, a smaller constructional length of the electric machine, which comprises a wave winding whose average winding length is shortened so that the work material requirement for the winding can accordingly also be smaller, is made possible without the power of the electric machine being substantially reduced. In an advantageous manner, the pole pairs are reciprocally arranged, in each instance, at half the height of a winding end so as to be eccentric relative to the armature stampings of the armature of the electric machine.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWING
The single FIGURE of the drawing shows a portion of an electric machine partly in longitudinal section.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
As seen in the drawing, four poles, which are located opposite one another as two pole pairs 2 and 3, are accommodated in a housing 1 of an electric machine, for example, for a cranking device for internal combustion engines. The pole pairs 2 and 3 are screwed in the housing 1 with screws 4. The pole pairs 2 and 3 carry an exciting winding which is constructed as a wave winding 5 and has portions 6 and 7, which extend substantially in the circumferential direction and form winding ends and contact the front side 8 or 9 of the pole pairs 2 and 3. The pole pairs 2 and 3 are arranged so as to be offset in the direction of the longitudinal axis 10 of the housing 1 and, accordingly, of the electric machine, in such a way that the front side 11 or 12 of the portions 6 and 7 of the wave winding 5 lies in the plane, in each instance, with the front side 13 or 14 of the pole pairs 2 or 3. The front side 13 or 14 has no winding, the aforementioned plane extending perpendicularly relative to the longitudinal axis 10 of the electric machine. The pole pairs 2 and 3 are offset relative to one another by the height of a winding end. This results in such arrangement of the pole pairs 2 and 3 in the housing 1 that they are reciprocally eccentrically offset by half the height of the winding end relative to the center of an armature stamping 15 of an armature 16 which extends through the wave winding 5 concentrically relative to the longitudinal axis 10. Accordingly, the winding ends 6 and the ends of the pole pair 3 pr
REFERENCES:
patent: 3328617 (1967-06-01), Preece
patent: 3449606 (1969-06-01), Preece
patent: 3597644 (1971-08-01), Preece
patent: 3818585 (1974-06-01), Preece
Budd Mark O.
Robert & Bosch GmbH
Striker Michael J.
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