Honeywell International Inc.

Vivek Salunke

Swapnil Gopal Patil

Kumaran Sena Narasimhan

Suresh Krishna

Azhagar Raj M

Nurul I Hasan

A robust solution for eccentricity issues in 360 degree rotary sensor application utilizing a hollow cylindrical magnet. A hollow cylindrical magnet design can be implemented to drive a parallel field magnetic sensor based on Hall/AMR technologies. Eccentricity variations of +/&#x2212;0.46 mm on X and Y axes can be reduced by at least 20%, in turn improving the repeatability, linearity error and a correlation error associated with the sensor. For tilts of +/&#x2212;3 degrees, the error can be reduced to at least 50% compared to a solid magnet, thereby increasing the repeatability and accuracy of the rotary sensor. The disclosed design improves linearity, is robust in vibration and improves reliability in lifecycle as the sensor configuration is less affected by wear and tear due to mechanical vibrations.

Rotary sensor with rotary sensing element and rotatable hollow magnet

A rotary position sensor apparatus includes a magnet having a surface and a plurality of Hall components placed in association with the surface of the magnet. The Hall components are located on a neutral axis of the magnet thereby forming a rotary position sensor apparatus having an enhanced linearity, a reduced calibration time and a compact size. A printed circuit board (PCB) can also be provided and the Hall components mounted to the PCB. The magnet preferably possesses a rectangular shape, but other shapes may be implemented depending upon design considerations.

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Bengaluru, India

Vivek Salunke