Inductive position sensor comprising at least one transmit coil, an absolute position receive coil pair, a high-resolution position receive coil pair and a conductive moving target

Abstract

An inductive position sensor including at least one transmit coil, an absolute position receive coil pair, a high-resolution position receive coil pair and a conductive moving target, the absolute position receive coil pair and the high-resolution receive coil pair together define a measurement area of the inductive position sensor and the moving target can move in this measurement area, the absolute position coil pair has a first sine receive coil and a first cosine receive coil, both having one period over the measurement area of the inductive position sensor, the high-resolution position receive coil pair has a second sine receive coil and a second cosine receive coil, both having at least two periods over the measurement area of the inductive position sensor, the absolute position receive coil pair and the high-resolution position receive coil pair are arranged in the same area of a printed-circuit board of the inductive position sensor.

What is claimed is: 
     
         1 . An inductive position sensor comprising:
 at least one transmit coil, an absolute position receive coil pair, a high-resolution position receive coil pair and a conductive moving target,   wherein the absolute position receive coil pair and the high-resolution receive coil pair together define a measurement area of the inductive position sensor and the moving target can move in this measurement area,   wherein the absolute position coil pair has a first sine receive coil and a first cosine receive coil, both having one period over the measurement area of the inductive position sensor,   wherein the high-resolution position receive coil pair has a second sine receive coil and a second cosine receive coil, both having at least two periods over the measurement area of the inductive position sensor, and   wherein the absolute position receive coil pair and the high-resolution position receive coil pair are arranged in the same area of a printed-circuit board of the inductive position sensor.   
     
     
         2 . The inductive position sensor according to  claim 1 ,
 wherein the inductive position sensor is a radial position sensor and the measurement area is a 360° circle.   
     
     
         3 . The inductive position sensor according to  claim 1 ,
 wherein the inductive position sensor is a linear position sensor and the measurement area is a straight line.   
     
     
         4 . The inductive position sensor according to  claim 1 , further comprising a signal processing unit, for providing a signal to the at least one transmit coil and/or for processing the signals of the absolute position receive coil pair and the high-resolution receive coil pair. 
     
     
         5 . The inductive position sensor according to  claim 4 ,
 wherein the signal processing unit is arranged on the same printed-circuit board as the inductive position sensor or externally connected to the printed-circuit board of the inductive position sensor.   
     
     
         6 . The inductive position sensor according to  claim 1 ,
 wherein the conductive moving target comprises multiple sections spaced apart from each other.   
     
     
         7 . The inductive position sensor according to  claim 6 ,
 wherein the multiple sections of the conductive moving target have the same shape and/or spacing.   
     
     
         8 . The inductive position sensor according to  claim 1 ,
 wherein the conductive moving target comprises at least one first target element and at least one second target element, wherein the shape of the at least one first target element is different to the shape of the at least one second target element.   
     
     
         9 . The inductive position sensor according to  claim 8 ,
 wherein the multiple sections of the at least one first target element covers the complete measurement area of the inductive position sensor or the measurement area of the inductive position sensor not covered by the at least one second target element.   
     
     
         10 . The inductive position sensor according to  claim 8 ,
 wherein the at least one second target element covers a part of the measurement area of the inductive position sensor.   
     
     
         11 . The inductive position sensor according to  claim 10 ,
 wherein the at least one second target element has a semi-circular shape, an arc segment of a full ring shape, a rectangular shape or an arrow shape.   
     
     
         12 . The inductive position sensor according to  claim 8 ,
 wherein the at least one first target element and the at least one second target element are arranged next to each other or are at least partially overlapping each other.   
     
     
         13 . The inductive position sensor according to  claim 12 ,
 wherein the at least one first target element and the at least one second target element are totally overlapping but having different sizes.