Electric drive motor

Details Electric drive motor Electric drive motor

1999-12-14

2001-01-16

Ramirez, Nestor (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S064000, C310S06800R, C165S080300

Reexamination Certificate

active

06175171

ABSTRACT:

PRIOR ART
The invention relates to an electric drive motor.
In a known, electronically commutated electric drive motor of this kind (DE 41 22 529 A1), an annular wall is attached to and of one piece with the outer annular edge of the support and this wall encloses the cup-shaped rotor with a radial gap spacing and has axial cooling ribs on its outside oriented away from the rotor. Switching transistors that are present in the power electronics and are for the electronic commutation are disposed on the printed circuit board so that their cooling surfaces lie flat against the radial surface of the support and are pressed against it by means of leaf springs. The dissipated heat that is essentially produced by the power transistors travels by way of the flange-like support into the annular wall and is dissipated relatively well here into the surrounding air since the rotor turning inside the annular wall also provides for a rapid exchange of the air disposed there.
ADVANTAGES OF THE INVENTION
The drive motor according to the invention has the advantage that by means of the concentric cooling ribs, not only is the surface area of the base body that acts as a cooling surface increased, but also an ideal circulation around the cooling ribs is produced in particular by virtue of the air flow against them, which is produced by the rotor that is embodied in the form of an external rotor so that on the whole, the removal of dissipated heat from the electronics is accelerated and improved. The heat dissipation capacity can be still further increased successively if, in accordance with preferred embodiments of the invention, large openings are let into the support. The openings can also interrupt the concentric cooling rings, and the printed circuit board is covered by a covering cap fastened to the support and the cap bottom of this covering cap is provided with openings that continue on in hollow cylindrical pins that extend to the support and are aligned with the openings in the support. In addition, the rotor has air openings in its cup bottom disposed opposite from the radial surface of the support with axial spacing. As a result, a good air exchange is assured on the inside of the motor, which improves the air removal from the inside of the motor and thus increases the cooling capacity.
If, according to another embodiment of the invention, the hollow chamber between the covering cap and the radial surface of the support oriented toward it is lined with a favorably heat conducting molded mass, then additional energy paths are produced. The energy paths convey dissipation heat from the electronics by way of the molded mass on the one hand to the cap and on the other hand to the base body and from there, dissipate the heat to the surrounding air.
Another improvement of the heat dissipation can be achieved by way of an additional energy path which, as is the case with the known drive motor described at the beginning, leads from the electronics by way of the support to an encompassing cylinder that is attached to this support on the edge and is of one piece with it axially, which also has additional axial cooling ribs on the outside. The rotor turning inside the encompassing cylinder also provides for an intensive air exchange against the inner wall of the encompassing cylinder.


REFERENCES:
patent: 3539848 (1970-11-01), Dosch et al.
patent: 4144932 (1979-03-01), Voigt
patent: 5006744 (1991-04-01), Archer et al.
patent: 5129451 (1992-07-01), Moir et al.
patent: 5659217 (1997-08-01), Petersen
patent: 5787976 (1998-08-01), Hamburgen et al.
patent: 5818133 (1998-10-01), Kershaw et al.
patent: 41 22 529 A1 (1993-01-01), None
patent: 295 12 597 U1 (1995-11-01), None
patent: 0 210 090 A1 (1987-01-01), None
patent: 0 439 016 A1 (1991-07-01), None
patent: 0 501 198 A1 (1992-09-01), None
patent: 1580841 (1969-09-01), None
patent: 2 652 458 A3 (1991-03-01), None

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