Position sensor employing a soft magnetic core
First Claim
1. A position sensor for detecting movements of a part, comprising:
- an elongate measuring coil having a longitudinal direction, a soft magnetic core arranged stationary with respect to the elongate measuring coil in the longitudinal direction and having a longitudinal extent and a cross-section that is small in relation to the longitudinal extent, a control magnet movable by the part in the longitudinal direction along the soft magnetic core to partially saturate the latter magnetically as a function of position, the soft magnetic core having a trough-shaped cross-section through which the control magnet is movable by the part.
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Accused Products
Abstract
A position sensor using a soft magnetic core and a permanent magnet for detecting linear or rotary movements of a part. In one embodiment, a differential transformer is provided with corresponding windings 3, 4 and 5, which are wound on a tubular carrier member 2. Provided inside the carrier member 2 are a saturatable core 6 with a V-shaped crosssection section and a control magnet 8 which slides on the inner surfaces. The core 6 is partially saturated on the contact surfaces, so that a virtual air gap is produced, so that the transformation ratio between the windings 3 and 4, 5 is controlled as a function of position. Other versions employ flat and/or meandering coil arrangements and, in two instances, rotational relative motion.
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Citations
19 Claims
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1. A position sensor for detecting movements of a part, comprising:
- an elongate measuring coil having a longitudinal direction, a soft magnetic core arranged stationary with respect to the elongate measuring coil in the longitudinal direction and having a longitudinal extent and a cross-section that is small in relation to the longitudinal extent, a control magnet movable by the part in the longitudinal direction along the soft magnetic core to partially saturate the latter magnetically as a function of position, the soft magnetic core having a trough-shaped cross-section through which the control magnet is movable by the part.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
Specification