Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1992-09-04
1994-03-22
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Linear
310 68D, 310 71, H02K 1600
Patent
active
052967700
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an electric machine, preferably a three-phase generator for vehicles.
An electric machine for vehicles is known having a plurality of connection terminals; a liquid-cooled, pot-shaped metal housing; a bearing cover closing the pot-shaped housing on the drive side; a drive shaft supported at one end thereof in the base of the pot-shaped housing and on another end in the bearing cover; two stator plate stacks spaced from each other axially in the pot-shaped metal housing; two three-phase windings, each of the three-phase windings having an exciter winding, the three-phase windings being inserted in slots of the stator plate stacks; two circumferentially extending claw pole rotors fastened to the drive shaft; rectifier units comprising negative and positive diodes; and regulator means.
A three-phase generator for motor vehicles having a double-generator system in a closed, liquid-cooled housing is already known from DE-OS 31 28 081 (FIG. 5), in which the drive shaft is mounted at each end in an end cover. It is further known from DE-OS 31 28 081 to locate the rectifier with the regulator means and connection terminals at the rear end cover, on the so-called B-side of the generator, and the V-belt pulley at the front end of the drive shaft on the so-called A-side.
This type of structure is not possible in electric machines which are inserted directly into a pot-shaped recess of the drive unit of a motor vehicle for cooling. The B-side of the three-phase generator is no longer accessible from the outside so that terminals can no longer be made there.
In this latter case a pot-shaped metal housing is used for the three-phase generator and the terminals or electrical connections are located at the bearing cover on the A-side of the generator. However, it is then very costly to attach and connect the rectifier units and regulator switches for the three-phase generator separately.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an electric machine in which the rectifier units and regulator circuit means are arranged as compactly as possible and jointly with the connection terminals in surface-cooled electric machines with two three-phase generator systems arranged axially one after the other.
According to the invention, the electric machine comprises a plurality of connection terminals; a pot-shaped metal housing having a base; a bearing cover closing the pot-shaped housing on the drive side; a drive shaft supported at one end thereof in the base of the pot-shaped housing and on another end in the bearing cover; two stator plate stacks spaced rom each other axially in the pot-shaped metal housing, the stator plate stacks each being provided with a slot; two three-phase windings, each of the three-phase windings having an exciter winding, the three-phase windings being inserted in the slots of the stator plate stacks, the three-phase windings and the exciter windings having electrical connection means received in the bearing cover; two circumferentially extending claw pole rotors fastened to the drive shaft; rectifier units comprising negative and positive diodes in the bearing cover; and regulator means on the bearing cover. The electrical connection means of the exciter and three-phase windings are electrically connected with the rectifier units, connection terminals and the regulator means on the bearing cover.
The electric machine according to the invention has the advantage that the regulator circuit means rectifier units and liquid-cooled three-phase generator with pot-shaped housing can be produced and sold as a complete unit for installation in a drive unit or the like. A further advantage consists in that the heat losses generated in the rectifier units and regulator circuit means can be transmitted to the liquid cooled means via the bearing cover so as to achieve a compact construction.
There are several advantageous embodiments of the invention.
In a preferred embodiment of the invention a thermally conductive and electr
REFERENCES:
patent: 3793544 (1974-02-01), Baumgartner et al.
patent: 4221982 (1980-09-01), Raver et al.
patent: 4262224 (1981-04-01), Kofink et al.
patent: 4546280 (1985-10-01), Plueger
patent: 4705983 (1987-11-01), Franz et al.
patent: 4980588 (1990-12-01), Ogawa
Patent Abstracts of Japan A-62 189942 (Mitsubishi) Aug. 19, 1987.
WOo A 8902161 (Robert Bosch) Mar. 9, 1989.
Buerger Klaus-Georg
Fakler Bernhard
Klaus Susanne
Pflueger Gerhard
Nguyen Matthew
Robert & Bosch GmbH
Stephan Steven L.
Striker Michael J.
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