Patent ID: 7710110
Filing Date: 2010-05-04
Classification: G01D

Abstract:
1. A rotary sensor apparatus, comprising: a rotary sensing element; a magnet having a hollow cavity extending through the magnet from a first side of the magnet to a second side, the magnet is rotatably mounted relative to the rotary sensing element so that the magnet is rotatable with the first side of the magnet remaining adjacent to the rotary sensing element, the rotary sensing element is arranged in a position spaced from said magnet with said hollow cavity extending along an axis that intersects at least part of the rotary sensing element, the rotary sensing element configured to detect rotational displacement of said magnet relative to the rotary sensing element; and wherein said magnet is associated with said rotary sensing element such that a presence of said hollow cavity within said magnet functions to mitigate an effect of eccentricity and/or tilt of said magnet relative to said rotary sensing element on the detected rotational displacement.