Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1997-07-02
1999-03-16
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 58, 310 59, 310 60R, 310 60A, 310 91, H02K 900, H02K 520
Patent
active
058834516
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a device for supporting an electric motor driving a turbine, notably for heating and/or air conditioning equipment in a motor vehicle.
It concerns more particularly a device of the type comprising a cage formed so as to delimit a housing for receiving the casing of the motor, which opens out into a shell for receiving the turbine, the housing comprising a base wall connected to a peripheral wall, itself connected to a substantially annular front wall forming part of the shell, and in which the peripheral wall is interrupted in order to define at least one channel for cooling the motor, the said cooling channel being delimited by two opposite lateral walls which extend in a substantially radial direction with respect to the axis of rotation of the motor.
A device of this type is disclosed by the publication FR-A-2 412 976.
The motor/turbine assembly, also referred to as a "motorized fan", is designed to blow out a flow of air coming from outside the passenger compartment of the vehicle or a flow of air recirculated from the passenger compartment in order then to send it into the passenger compartment after having been heated or cooled by a suitable heat exchanger.
The cooling channel or channels formed in the cage supporting the motor are designed to divert a proportion of the air flow moved by the turbine, so as to cool the electric motor. Generally the cage delimits two opposite cooling channels. As a result of this a proportion of the air flow enters a channel which serves as an air inlet, then sweeps the parts of the motor to be cooled and is discharged through the other channel, which serves as a discharge channel.
The support devices known up to the present time do not always give complete satisfaction since they very often generate a high noise level, which impairs the comfort of use of the heating and/or air conditioning equipment.
This noise level is due partly to the acoustic radiation from the support and shell excited by the vibrations generated by the motor, and partly to the turbulences in the air flow which enter the cooling channels.
Moreover, they do not provide correct guidance of the air flow used for cooling the electric motor.
Another problem associated with this type of device lies in the fact that it is necessary, on each occasion, to provide a different cage according to the direction of rotation of the turbine, the latter being dependent on the vehicle on which the heating and/or air conditioning equipment is to be installed. This is because, up to the present time, it is necessary to provide different directions of rotation depending on whether the equipment is intended for a vehicle with right-hand drive or a vehicle with left-hand drive, or according to the internal arrangement of the components making it up.
BRIEF SUMMARY OF THE INVENTION
The aim of the invention is notably to overcome the aforementioned drawbacks.
To this end it proposes a device of the type defined in the introduction in which the peripheral wall has at least two U-shaped folded lugs, directed towards the inside of the housing and able to come into abutment against the outer casing of the motor.
These lugs decouple and dampen the vibration emitted by the motor and thus prevent the transmission of this vibration to the device and prevent noise being generated in the passenger compartment of the motor vehicle.
The invention thus makes it possible to omit rubber dampers and their holding rings which were up to the present time necessary, which notably makes it possible to eliminate the damper fitting operations.
In a preferred embodiment of the invention, the device comprises four folded lugs disposed advantageously at vibration nodes of the motor.
These lugs are preferably produced in the form of elastic blades moulded in one piece with the peripheral wall.
According to another aspect of the invention, at least one of the two lateral walls of the cooling channel is connected to the annular front wall by an inclined deflector wall.
Whereas up to the present t
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Delire Philippe
Houache Frederic
Majchrzak Jean-Pierre
Dougherty Thomas M.
Nguyen Tran N
Valeo Climatisation
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