Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-03-17
2001-09-18
Enad, Elvin (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S06800R, C310S089000
Reexamination Certificate
active
06291912
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention concerns the field of electric motors, in particular for motor vehicles, and more particularly their control circuit.
In some such motors the control circuit, which is on a circuit board, controls the operating conditions of the motor and consequently includes electronic components, in particular power electronic components, that radiate a significant quantity of heat when operating. Such components, for example power transistors, are generally cooled by a heatsink.
The heat that is radiated is mainly evacuated to the heatsink by conduction via the board carrying the control circuit. This causes heating of the other components of the control circuit and in particular of the copper tracks, which can in some cases damage electronic components and the soldered joints by which components are interconnected.
Integrated circuits able to withstand high temperatures can be used, of course, but such circuits are very costly.
The solutions known per se are therefore not entirely satisfactory.
Consequently, one aim of the invention is to procure an electric motor that does not have the drawbacks of the prior art motors.
BRIEF SUMMARY OF THE INVENTION
To this end the invention proposes a motor of the type defined in the introduction in which, on the one hand, a collar is provided adapted to be immobilised relative to the motor in a position in which it surrounds the board and to retain the heatsink at the periphery of the body of the motor and, on the other hand, the heatsink includes a housing adapted to receive at least some of the electronic components that radiate heat at a location suitable for connecting them to the control circuit.
In this way the electronic components which radiate a great deal of heat are isolated from the other components, without increasing the overall size of the motor.
The collar and the motor preferably comprise respective co-operating means of like shape enabling at least partial immobilisation of the former (collar) relative to the latter (motor).
In a first embodiment the collar is attached to a flange forming a cover adapted to protect the control circuit board and the part of the motor that supports it, the collar preferably being immobilised relative to the motor by crimping lugs carried by said motor.
Radial lugs can equally be provided on the collar to enable the motor to be fixed to a support, for example a housing.
In a second embodiment the motor includes a flange that forms the cover and includes crimping lugs enabling it and the board to be immobilised relative to the motor.
The collar and the heatsink could be made separately and fastened together, for example, by providing an opening in the collar shaped to receive a like part of the heatsink. The heatsink and the collar could equally be in one piece, however.
In one particular application of the invention the electric motor drives a fan at varying speeds. In this case it is particularly advantageous for the heatsink to include cooling fins with respective shapes and orientations adapted to suit the flow of air produced by the fan. This improves the efficiency of the heatsink.
A motor of the above kind could be part of a motor-fan unit, for example, in particular in a motor vehicle heating, ventilation and/or air conditioning installation.
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International Search Report dated Nov. 17, 1998.
Chanfreau Mathieu
Couetoux Herve
Nadir Noureddine
Rochelle Laurent
Enad Elvin
Lam Thanh
Morgan & Finnegan , LLP
Valeo Climatisation
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