Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1989-07-19
1990-11-20
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 89, H02K 122
Patent
active
049721143
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an alternating-current generator. Such an alternating-current generator is already known from U.S. Pat. No. 3,271,606. The claw poles described in this document, have an outer surface which exhibits an air gap which is increasingly larger towards its rear edge with respect to the stator hole. Such claw poles cause a reduction in magnetic noise in comparison with other known claw poles having a constant air gap, without, however, causing a signficant loss in magnetic flux.
From U.S. Pat. No. 3,714,484, claw poles are also already known in which--seen in the direction of rotation of the claw pole rotor--the rear area of the outer surface of each claw pole is provided as an area which is rotated in itself; this design of the claw poles is intended to produce a compromise between noise reduction and energy loss of the generator.
In both the above examples, the production of the special shape of the claw poles is expensive due to high tooling costs.
SUMMARY OF THE INVENTION
The object of the invention is to provide an alternating-current genertor having such a claw pole rotor in which the generation of magnetic noise is further reduced due to optimised shaping of the claw poles but without exchanging this for increased energy losses of the alternating-current generator cycle; in addition, the claw poles should be inexpensive to produce.
According to the invention, this object is achieved by providing an alternating-current generator in which the outer surfaces of the claw poles have two or three plane areas which extend from the claw pole front area to the rear edge of the claw pole transversely to the direction of rotation of the claw pole rotor. The plane area arranged closer to the rear edge forms a greater angle of inclination with a tangent located on the outer surface of the respective claw-pole in the area of the narrowest air gap thereof, than the plane area in front of it in the direction of the claw-pole.
The present invention both as to its construction so to its mode of operation, together with additional objects and advantages thereof, will be best understood from the following description of the preferred embodiments with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a cross-sectional view of an alternating-current generator,
FIG. 2 according to the invention shows a part view of a pole wheel of a claw pole rotor from the claw pole side,
FIG. 3 shows a top view of an outer surface of a claw pole,
FIG. 4 shows a cross-sectional view through the claw pole along line IV--IV in FIG. 3 and
FIGS. 5 and 6 show top views of the outer surface of claw poles of different configuration in accordance with the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The alternating-current generator 10 shown in FIG. 1 is a compact three-phase generator according to the invention, such as is currently installed in most motor vehicles. However, the application of the subject matter of the invention is not restricted to compact three-phase generators but is generally applicable to alternating-current generators having claw pole rotors.
This alternating-current genertor 10 has as metallic casing 11 formed by two cup-shaped end shields 12 and 13, between the open front areas 14 and 15 of which a stator 16 is clamped. Stud bolts fixed in the two end shields 12 and 13 are used as clamping elements 17 for connecting the two end shields 12 and 13 to the stator 16. The end shields 12 and 13 in each case contain a ball bearing 18 and 19, respectively, for rotatably accommodating a claw pole rotor 20. The stator 16 is composed of mutually insulated sheets (laminations) which consist of magnetizable iron and are compressed to form a solid stack of laminations. The essentially annular stator 16 is provided with slots 22 in its stator hole 21 for accommodating alternating-current windings 23. In this three-phase generator 10, the alternating-current windings 23 are three wave-like windings which are spatially offset by 120 degrees and which, when the altern
REFERENCES:
patent: 3004181 (1961-10-01), Noddin
patent: 3184625 (1965-05-01), Farison
patent: 3271606 (1966-09-01), Collins
patent: 3714484 (1973-01-01), Habert
patent: 4201930 (1980-05-01), Inagaki
patent: 4716485 (1986-10-01), Nakamura
Robert & Bosch GmbH
Skudy R.
Striker Michael J.
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