Permanent magnet motor driven window lifter
AssigneeSiemens Aktiengesellschaft
InventorsPeter Adam, Werner Seuffert, Abdul R. Saeed
Life of this patent
Estimating the term…
Abstract
A motor drive for a window lifter in motor vehicle doors has an integrated flat housing containing a permanent magnet DC motor and a worm gear driven by a worm on the extended motor shaft; the housing has two halves which are separable in the plane of the motor axis and which serve as the return yoke of the motor. A single permanent magnet is arranged in the space defined on two sides essentially by the motor rotor on the one hand and the worm gear on the other hand and each of the two housing halves serves as a pole plate.
Claims8
A motor drive useful in a window lifter for motor vehicles, having an integrated narrow housing comprising:
- (a) a substantially continuous hollow, non-magnetic frame;
- (b) a permanent magnet DC motor comprising
- (1) a rotor;
- (2) a single permanent magnet;
- and
- (3) first and second pole plates for conducting flux from said magnet to opposite sides of said rotor, said pole plates in contact with said magnet on opposite sides thereof;
- (c) a worm gear drive comprising:
- (1) a drive shaft extending from said rotor and connected to a worm;
- (2) a worm gear which lies in the plane of the drive shaft engaging said worm;
- (d) said single permanent magnet located adjacent to the rotor on the same side of the shaft as the worm gear and bounded on one side by said rotor on an adjacent side by said worm gear and on the side opposite said rotor by said hollow non-magnetic frame;
- and
- (e) said pole plates being in the form of covers fastened to said frame on opposite sides of the rotor, magnet and worm gear, said covers and said continuous hollow non-magnetic frame thereby forming the housing for said motor drive.
Dependencies are inferred from the claim text.