capacitive rotation sensor

Abstract

A capacitive rotation sensor for detecting the position of an object moving relative to a stationary object, comprises a shaft (3) rotatably supported in a housing flange (1); a stator (8) situated opposite to it is assigned, where at least the rotor, the stator and an evaluation circuit are enclosed by an electrically conductive cap; and a non-rotation-symmetrical rotor disc (6) which, in turn, is fixed on a rotor support (5), where the rotor support is fastened highly precisely on the outer periphery of the shaft so as to be integral in rotation with it. A capacitive rotation sensor for detecting the position of an object moving relative to a stationary object, comprises a shaft (3) rotatably supported in a housing flange (1), where the shaft is connected integral in rotation with it to a rotor to which, separated by an air gap; a stator (8) situated opposite to it is assigned, where at least the rotor, the stator and an evaluation circuit are enclosed by an electrically conductive cap, where a stator surface is arranged on the underside of a circuit board and that the stator surface has assigned to it, situated opposite to it and separated by the air gap; and a non-rotation-symmetrical rotor disc (6) which, in turn, is fixed on a rotor support (5), where the rotor support is fastened highly precisely on the outer periphery of the shaft so as to be integral in rotation with it.

Description

technical field [0001] The invention relates to a capacitive rotation sensor. Background technique [0002] Such a capacitive rotation sensor is disclosed, for example, in the context of EP1173730B1 (DE60016395T2). However, this rotary sensor has its disadvantages: it is rather complex and expensive to produce, since it has to be fulfilled that an outer rotor shaft can only be press-fitted to an inner rotor disk in a press-fit seat. On the vertical flange, in order to realize the mechanical assembly of the rotary sensor. [0003] A disadvantage of the construction described above is that, in the case of a press-fit seat between a vertical flange of the rotor disc and the outer circumference of the rotor shaft, a certain imbalance or shock (wobble error) occurs on the rotor disc , which can only be corrected with difficulty by an analysis circuit. [0004] Furthermore, the known arrangement has the disadvantage of lacking a cover that can enclose the entire device, in part...

AI Technical Summary

Problems solved by technology

However, this rotary sensor has its disadvantages: it is rather complex and expensive to produce, since it has to be fulfilled that an outer rotor shaft can only be press-fitted to an inner rotor disk in a press-fit seat. On a vertical flange for mechanical assembly of the rotary sensor

[0003] A disadvantage of the construction described above is that, in the case of a press-fit seat between a vertical flange of the rotor disc and the outer circumference of the rotor shaft, a certain imbalance or shock (wobble error) occurs on the rotor disc , which can only be corrected with difficulty using an analysis processing circuit

[0004] Furthermore, the known arrangement has the disadvantage of lacking a cover that can enclose the entire device, in particular a cover that has a pivot bearing for the rotor shaft in order to be as accurate and aligned as possible. Central and shock-free guidance of the rotor shaft

[0006] Therefore, this system according to the prior art is structurally rather complicated, and the valuation analysis of the angle of rotation is inaccurate

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