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Inductive position sensor

A measuring device and inductive technology, applied in the direction of measuring devices, electrical devices, special recording/indicating devices, etc., can solve the problems of measurement result damage, difficulty in fully shielding external magnetic fields, and cumbersome problems

Inactive Publication Date: 2015-06-10
ROLLAX GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when this path measuring device is used in a motor vehicle, the path measuring device may be affected by magnetic fields formed elsewhere in the vehicle
Adequately shielding external magnetic fields can be difficult and cumbersome in certain installation conditions of the vehicle transmission, but if these external fields are not adequately shielded, there is a risk that the external magnetic field will induce a voltage in the sensor coil and therefore may damage to the measurement results

Method used

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Examples

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Embodiment Construction

[0017] figure 1 Shown is a coil arrangement 10 with a cylindrical sensor coil 12 , an air-core coil (in this example) and a likewise cylindrical compensating coil 14 . The sensor coil 12 and the compensation coil 14 are coaxially wound on a common carrier 16 made of non-magnetic material with a specific distance from each other. At the end of the sensor 12 opposite the compensating coil 14 is shown the end of a ferromagnetic plunger 18 which moves in the axial direction of the coil arrangement and penetrates the sensor coil 12 a certain distance S max ,Such as figure 1 shown by the dotted line in . The plunger 18 affects the inductance of the sensor coil 12 such that, by measuring this inductance, the change from the original position of the plunger 18, i.e. figure 1 The solid line shown in , travels the path to the interior of the sensor coil.

[0018] The sensor coil 12 surrounds a certain annular area A1. The turns of the compensation coil 14 are situated radially outw...

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Abstract

The device has movable measuring plunger (18) provided relative to measuring coil (12) which is arranged coaxially relative to series-compensating coil (14), to compensate interference voltages caused by external magnetic fields in the measuring coil. A measuring circuit is provided to measure inductance of measuring coil and series-compensating coil along the moving direction of plunger. The enclosed area of compensation coil is larger than that of measuring coil, and the number turns of compensation coil is smaller than the number of turns of measuring coil.

Description

technical field [0001] The invention relates to an inductive path measuring device having: a sensor coil; a plunger movable relative to the sensor coil; a compensation coil arranged coaxially with the sensor coil and connected in series with the sensor coil, a noise voltage induced in the sensor coil to compensate for the external magnetic field; and a measurement circuit for measuring the inductance of the sensor coil and the compensation coil according to the path of the plunger. [0002] More precisely, the invention relates to a path measuring device in a gear sensor of a motor vehicle. Background technique [0003] WO 2010 / 006781 A1 describes a gear sensor for detecting the current gear of a transmission. In this sensor, a plunger is mechanically connected to a stop member elastically biased with respect to a shift shaft of a transmission, and checks a selector relief formed on the shift shaft. Thus, the shift shaft movement is converted into an axial movement of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/22G01D5/20G01B7/02
CPCG01D3/0365G01D5/2013
Inventor R·孟肯米勒
Owner ROLLAX GMBH & CO KG