Attachment device for speed sensor in a motor

Abstract

A device for providing a low-cost mounting arrangement for a hall effect device to sense the speed of an electric motor. The device uses a plastic base fixed to or integrated into the motor bearing support and designed to hold a standard mass termination connector, hall effect device and leadwire harness which passes digital information to a circuit board for motor speed control.

I claim as my invention: 
     
       1. In combination with an electric motor having a bearing support with an armature or rotor shaft rotatably journalled in said bearing support, a device for sensing the speed of rotation of said shaft comprising markers on said shaft, pickup means adjacent said shaft to convert the sensing of passage of said markers into electrical impulses, and base means affixed to said bearing support to hold said pickup means releasably in position adjacent said shaft, said pickup means includes a holder, a pickup fastened to said holder, and said base means having walls adapted to retain said holder releasably within said walls; and a portion of said walls provides a clamp extending beyond the .[.base means.]. .Iadd.holder.Iaddend., said portion of said walls being able to be flexed to hold said .[.base means.]. .Iadd.holder .Iaddend.releasably within said walls.   
     
     
       2. The combination of claim 1 in which said walls are affixed to a rear wall, said rear wall having extended ears, said ears providing attachment means in which said base means is fixed to said end plate. 
     
     
       3. The combination of claim 1 in which said base means includes one wall formed with an inset, said holder having a shoulder adapted to engage said inset on said wall to properly position said pickup adjacent said shaft. 
     
     
       4. The combination of claim 1 in which said bearing support is formed of a plastic material, said base means being integrally formed with said bearing support. .Iadd.5. An apparatus for positioning a speed sensing device adjacent an electric motor having an end with a shaft extending through the end and a marker on the shaft, whereby the speed sensing device senses the speed of the motor by sensing the passage of the marker, the apparatus comprising: a base attachable to the end of the motor;   a plurality of walls extending from the base, the walls being shaped to receive the speed sensing device to hold the speed sensing device adjacent to the marker;   a protrusion formed on one of the walls to releasably secure the speed sensing device within the walls; and   wherein said protrusion is movable relative to the base to allow the apparatus to secure and release the speed sensing device. .Iaddend..Iadd.6. The apparatus of claim 5 wherein the one wall is flexible to allow the protrusion to move to and from retentive engagement of the speed sensing device. .Iaddend..Iadd.7. The apparatus of claim 5 further comprising a pair of ears extending from the base wherein the ears are adapted to be coupled to the end of the motor. .Iaddend..Iadd.8. The apparatus of claim 5 wherein one of the walls is formed with an inset adapted to engage a corresponding inset formed on the speed sensing device to properly position the speed sensing device relative to the shaft. .Iaddend.