Electric motor with hall effect memory module
View Patent ↗An electric motor with a Hall effect module. An endframe is attached to a motor housing to enclose one end of the motor housing. A cover is snap-fit onto the endframe externally of the motor housing, wherein resilient fingers on the endframe engage an arrangement of lugs and/or recesses on the cover. A one-piece magnet/carrier assembly and an electronic sensor are captured between the cover and the endframe to provide a Hall effect sensing feature. Optionally, the cover may be attached to the endframe without the magnet/carrier assembly and the electronic sensor when the Hall effect sensing feature is not desired. The endframe additionally includes rigid walls disposed about the resilient fingers which aid in locating and guiding the cover onto the endframe and into engagement with the resilient fingers. After the cover is attached to the endframe, the walls protect the resilient fingers and abut the outside surface of the cover, providing a robust connection between the cover and endframe and preventing disengagement of the cover from the endframe.
1. An electric motor, comprising:
a motor housing containing a stator, rotor, and armature assembly;
an endframe attached to an open end of said motor housing, said endframe including an opening aligned with said armature, a plurality of resilient fingers extending from said endframe, and a plurality of walls extending from said endframe, each said wall at least partially surrounding a respective said finger;
a cover attached to said endframe, said cover including engagement structure engaged by said resilient fingers, said endframe and said cover defining a cavity therebetween;
a magnet and a Hall effect sensor each disposed within said cavity, said magnet aligned with said endframe opening, and said Hall effect sensor disposed proximate said magnet.
2. The motor of claim 1 , wherein said armature includes a hole in an end thereof, and each of said endframe, magnet, and cover include openings axially aligned with said armature hole.
3. The motor of claim 2 , further comprising a drive component disposed within said armature hole, said drive component extending through said openings in said endframe, magnet, and cover.
4. The motor of claim 3 , wherein said drive component is keyed to said magnet opening.
5. The motor of claim 1 , wherein said engagement structure comprises at least one of a lug and a recess.
6. The motor of claim 1 , wherein said armature assembly is drivingly connected to a gear box.
7. The motor of claim 1 , wherein said resilient fingers are integrally formed with said endframe.
8. The motor of claim 1 , wherein said resilient fingers comprise securement tabs, said engagement structure engaged by said securement tabs.
9. The motor of claim 1 , further comprising a carrier assembly including said magnet integrally formed therewith.
10. The motor of claim 1 , wherein said walls and said cover are in abutting engagement.
11. The motor of claim 1 , wherein said plurality of resilient fingers comprise at least three flexible fingers extending outwardly from said endframe.