Patent ID: 6946832

Claim:
A sensing assembly for sensing speed and angular position of a device rotatable about an axis of rotation with respect to a frame, said sensing assembly comprising: an encoder target wheel fixedly secured to the device such that said encoder target wheel rotates about the axis of rotation; a first sensor fixedly secured to the frame at a predetermined distance from the axis of rotation, said first sensor having a first output line and transmitting a first output thereover; a second sensor fixedly secured to the frame at said predetermined distance from the axis of rotation offset and angularly displaced from said first sensor by ninety degrees, said second sensor having a second output line and transmitting a second output thereover; and a controller electrically connected to said first and second sensors to receive said first and second outputs and to calculate an angular position and a speed for said encoder target wheel and the device, wherein said controller includes a comparator for generating a differential signal by comparing said first and second outputs and measuring a difference of said first and second outputs against a threshold.