Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1987-07-14
1989-01-24
Wong, Peter S.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 71, 310 89, 310DIG6, H02K 2900, H02P 100
Patent
active
048003077
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to an electric motor having a flange disk that is arranged vertically to the motor shaft, and the stator being fixed to the interior side of said flange disk, and having a control circuit for the motor for which a circuit board is provided that is arranged plane-parallel to the flange disk on the side of the stator that faces the flange disk.
In the case of an electric motor of this type that is known from DE-Al No. 25 14 067, the circuit board is developed to be ring-shaped and is arranged coaxially to the motor shaft between the stator and the flange disk.
For the mass production of driving motors, an electric circuit is required that, as a rule, is manufactured at a separate manufacturing site. Those manufacturers of electric motors who are not equipped for manufacturing circuits of this type, purchase these, together with the circuit board, from the outside. Large-scale purchasers of electric motors of this type are often manufacturers of electronic apparatuses. Under certain circumstances, these large-scale purchasers may be able to cost-effectively manufacture these circuits with the circuit boards themselves. This is particularly true if the electric motors in question are part of a fan, for such fans are often used for the cooling in electronic apparatuses.
For this reason, it is an objective of the invention to develop an electric motor of the initially mentioned type in such a way that the circuit board with the circuit can subsequently be conveniently installed into the otherwise completely finished electric motor, for the purpose of rationalizing the manufacturing process, in that, for example, the manufacturer of electric motors furnishes the electric motors to his customers without the circuit board, and the customer can then manufacture the circuit boards rationally himself and can also install them subsequently in a convenient way.
An objective is achieved by the fact that the circuit board is arranged on the exterior side of the flange disk that faces away from the stator.
For this purpose, the circuit board is preferably ring-shaped--possibly with recesses at the exterior edge--and arranged coaxially to the motor shaft.
The invention makes it possible to prefabricate unfinished driving motors that are fully operable finished driving motors, except for the circuit board that has to be inserted, and then subsequently, when required, equip them with a circuit board and as a result finish them completely.
Circuit boards may be used that are equipped with different control circuits, according to the desired motor operation. In this case, only one single unfinished motor type must be held available for different types of motors, which simplifies mass production and also warehousing.
The circuit boards may be glued in, clamped in, screwed in or fastened in another way. It is advantageous to fasten the circuit board by means of a locking means into which the circuit board can be easily inserted. On such a locking arrangement, a passageway is provided through the circuit board and spring elements on the flange disk are compressed together and inserted through the passageway and then allowed to expand and catch onto recess areas on the circuit board, to hold the circuit board to the flange disk. In this way, the subsequent mounting of the circuit board is largely prepared and facilitated.
The connection of the stator to the circuit board may take place by soldered or welded electrical connections. The required soldering and welding operations are not necessary if the connection is established by means of contacts connected to the stator which automatically cooperate with counter-contacts on the circuit board when the board is inserted into the flange disk.
It is recommended to cover the circuit board on its back side facing away from the flange disk by means of an insulating plate. The insulating plate may be a glued-on foil.
The circuit board is held securely and also protected with respect to mechanical outside effects if a recess is
REFERENCES:
patent: 4603271 (1986-07-01), Maruyama et al.
patent: 4647803 (1987-03-01), von der Heide et al.
patent: 4663549 (1987-05-01), Suzuki
patent: 4673834 (1987-06-01), Wrobel
Papst-Motoren GmbH
Rebsch D. L.
Wong Peter S.
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