| 摘要 |
A position sensor comprising a stator (1) defining an airgap having arranged therein a moving magnet (3) which is integral with a coupling means (4). The sensor comprises a Hall probe (12) for measuring changes in induction in the air gap (10). The stator (1) consists of a first, stationary portion and a second, stationary or movable portion (2) with a main airgap (5) being formed therebetween and allowing movement of the portion of the movable device. The movable device has at least two adjacent thin portions which are transversally magnetized in alternate directions and made of a material having, throughout the working sphere, a virtually linear demagnetization characteristic and a reversible permeability close to that of air. The stationary portion has at least two secondary airgaps (10, 11) which are substantially perpendicular to the main airgap (5) with the movable device. The Hall probe (12) is housed in one of said secondary airgaps (10, 11). The L/E ratio is greater than 6, wherein L is the width of a magnetic pole and E is the width of the main airgap (5).
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