Method and arrangement and sensor for determing the postion of a component
AssigneeASG Luftfahrttechnik und Sensorik GmbH
InventorReiner Strietzel
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AssigneeASG Luftfahrttechnik und Sensorik GmbH
InventorReiner Strietzel
Estimating the term…
The invention relates to a method and an arrangement for determining a position of a first component (14) such as a piston rod in relation to a second component (12) such as a hydraulic, electrical or pneumatic cylinder, wherein at least one first magnetically scannable structure (34) such as a measurement strip formed on a surface (18) of said first component (14) is detected by means of at least one first magnetic flux sensor (22) connected to the second component (12) during a relative movement between the first component (14) and the magnetic flux sensor (22). To improve the accuracy of the position determination, the method is executed according to the invention as a differential measuring method, wherein a differential transformer is used as the magnetic flux sensor (22), and wherein the position of the first component (14) in relation to the second component (12) is determined absolutely, wherein a second magnetically scannable structure (28) arranged on the surface (18) of the first component (14) is detected by means of at least one second magnetic flux sensor (32) connected to the second component (12), and wherein the absolute position of the first component (14) is determined from the signal sequence of the first magnetic flux sensor (22) and the continuous output signal of the second magnetic flux sensor (32).
A method for determining a position of a first component (14) in relation to a second component (12), wherein at least one first magnetically scannable structure (34) formed on a surface (18) of the first component (14) is detected by means of at least one first magnetic flux sensor (22) connected to the second component (12) during a relative movement between the first component (14) and the first magnetic flux sensor (22), wherein to execute a differential measurement method, a differential transformer is used as magnetic flux sensor (22), said transformer comprising a primary winding (36) and two secondary windings (40, 42), which are interconnected such that the difference between the signals of the interconnected secondary windings results directly in their respective output signal, wherein the voltages generated by the primary winding in the secondary windings are mutually canceled out when the windings are symmetrically magnetically coupled, wherein the first magnetically scannable structure is embodied as magnetically scannable regions of a metallic surface that have a different permeability or magnetic property, such that the magnetic coupling of the windings changes during the relative movement of the first differential transformer along the magnetically scannable structure, whereby a continuous incremental signal is present at the output of the first differential transformer, the magnitude of which is a measure of asymmetry, and from which the relative position of the first component is determined,
An arrangement for determining a position of a first component (14) in relation to a second component (12), comprising at least one first magnetic flux sensor (22), connected to the second component (12), for detecting a first magnetically scannable structure (20) formed on a surface (18) of the first component (14) during a relative movement between the first component (14) and the first magnetic flux sensor (22), wherein the first magnetic flux sensor (22) is embodied as a differential transformer having a primary winding (36) and two secondary windings (40, 42) which are interconnected such that the difference between the signals of the connected secondary windings results directly in their respective output signal, so that the voltages generated by the primary winding in the secondary windings are mutually canceled out when the windings are symmetrically magnetically coupled, wherein the magnetically scannable structure is formed on the metallic surface of the first component in the form of regions of different permeability or magnetic property, such that the magnetic coupling of the windings changes during a relative movement of the differential transformer along the measurement structure, whereby a continuous signal is present at the output of the first differential transformer, the magnitude of which is a measurement of asymmetry, and the relative position of the first component can be determined from the course of this continuous, incremental signal,
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