Permanent magnetic motor for vehicle door window

Details Permanent magnetic motor for vehicle door window Permanent magnetic motor for vehicle door window

H - Electricity

02

K

310/47, 310/70

H02K 23/04 (2006.01) F16H 1/16 (2006.01) H02K 7/08 (2006.01) H02K 7/116 (2006.01)

Patent

CA 1070366

Abstract of the Disclosure A dynamo-electric machine comprises an armature and a permanent magnet field structure including at least two permanent magnets and at least two field shoes. Each field shoe has an arcuate surface which forms one side of an air gap between the shoe and the armature, and is configured to direct magnetic flux from the permanent magnets to the arcuate surface such that the magnetic lines of force emanating from the surface and extending through the armature are of substantially uniform distribution and intensity. This is accomplished by making the shoe decrease from a maximum thickness in the radial direction in the area of the arcuate surface adjacent the magnets to a minimum thickness in the radial direction in the area of the arcuate surface adjacent a plane midway between the magnets. The uniform intensity is further enhanced by making the arcuate surface nonconcentric with the periphery of the armature to provide an air gap of minimum width in the area adjacent the aforesaid plane and increasing along the arcuate surface to a greater width in the area adjacent said magnets.

266900

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