Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-09-19
2001-10-09
Enad, Elvin (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S071000, C310SDIG006, C310S06800R, C439S189000
Reexamination Certificate
active
06300697
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a circuit configuration for connecting the stator windings of a brushless, electronically commutated motor.
BACKGROUND INFORMATION
Electronically controlled electric motors are coming more and more to the fore in a number of areas of application. In this connection electric motors are involved in which the required periodic switching of coils is no longer performed by a commutator, but rather by electronic switching devices. The electronic switching devices can include for example suitable sensors which determine when the stator and the rotor for the coils about to be switched, are in a position relative to each other that is favorable to or requires switching. It is understood that the electronic switching devices must also ensure that current is fed to the respective coils in the appropriate direction.
It is also known to use permanent magnets either for the stator poles or for the rotor poles in electronically controlled electric motors. Permanent magnets offer a number of advantages, such as no current consumption, small dimensions, and simple manufacturing and assembly. Such electric motors are used today in many technical areas, such as, for example, also in the automobile industry as drive motors for radiator fans or servo-devices. The available space for installing an electrically operated fan for cooling the radiator is very limited, particularly in automobiles in which the combustion motor is installed lengthwise in the travel direction. Conventional permanent magnet motors cannot be used because of their large axial structural length.
European Patent Publication EP 0,645,542 discloses an automobile cooling fan with an electric (EC) motor wherein the windings of the armature and other electronic components are connected with a printed circuit on a carrier or support. In that case, connecting the free ends of the windings with the printed circuit is still relatively complicated and costly.
U.S. Pat. No. 5,548,458 discloses a circuit arrangement for connecting the stator windings of a brushless, electronically commutated electric motor that is provided for driving computer hard disc drives. That disclosure shows concentrically arranged conductor paths on a side of an annular disk-shaped support plate that faces away from the stator assembly.
The ends and/or the leads of the winding wires are fastened by means of solder pads on the support plate, whereby the solder pads are connected by connecting conductors with the current paths.
Furthermore, the European Patent Publication EP 0 777 312 A2 discloses a stator for electric motors that comprises a stator assembly, stator windings, and a circuit configuration for the stator windings arranged on an endface of the stator assembly. The circuit configuration particularly has an insulating part with groove-shaped chambers for receiving electrical connection leads that are insulated relative to each other for connecting the winding ends of the stator windings. The publication does not, however, disclose a star connection with a star point.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a circuit configuration for connecting the stator windings of a brushless, electronically commutated electric motor that will provide simple stator winding interconnections in a flat construction. This object has been achieved by the combination of the following features of a brushless, electonically commutated drive motor. According to the invention the motor has a stator with three phase windings angularly spaced by 120° and a supporting circuit board arranged so as to face the stator on its flange side. The circuit board has an annular disk-shaped support plate that is fixedly mounted by a hub to a bearing support pipe on a motor flange. The circut board further has conductor rails fixed on a side of the support plate facing away from stator winding coils. The conductor rails are arranged concentrically about the hub on the support plate. One each of the conductor rails is connected with winding leads of each of the stator winding coils of one of the phase windings. One of the conductor rails is connected with leads of the stator winding coils of all phase windings. A first conductor rail which is arranged closet to the hub of the support plate has angled connector tabs adapted for connecting with said leads of the stator winding coils of all phase windings through holes passing through the support plate between the ring-shaped hub of the support plate and the first conductor rail. Three additional conductor rails forming second, third and fourth conductor rails are concentrically arranged around the first conductor rail on the support plate. Connector tabs of the second, third, and fourth conductor rails are provided for connection with winding leads. These connector tabs are arranged equidistant from the hub on the periphery of the support plate. The connector tabs of the second conductor rail pass through recessed guides under the third conductor rail and under the fourth conductor rail. The connector tabs of the third conductor rails pas through recessed guides under the fourth conductor rail.
The circuit board according to the invention, is made as an annular support plate and a stamped conductor rail, assures a simple connection of the circuit board with the free ends of the stator windings, in addition to a cost effective assembly. Further advantageous embodiments of the invention are described below.
REFERENCES:
patent: 3984714 (1976-10-01), Grozinger et al.
patent: 4593464 (1986-06-01), Williams et al.
patent: 4689023 (1987-08-01), Strong, III et al.
patent: 4845396 (1989-07-01), Huber
patent: 5157293 (1992-10-01), Escaravage
patent: 5548458 (1996-08-01), Pelstring et al.
patent: 5828147 (1998-10-01), Best et al.
patent: 0477054 (1992-03-01), None
patent: 0645542 (1996-03-01), None
patent: 0777312 (1997-06-01), None
patent: 2651933 (1991-03-01), None
patent: WO97/26700 (1997-07-01), None
Findeisen Antje
Kramer Thomas
Von Knorre Dietrich
Enad Elvin
Fasse W. F.
Fasse W. G.
Lam Thanh
TEMIC Automotive Electric Motors GmbH
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