Importance

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Abstract

A movement parameter sensor for sensing of parameters of movement between a stator member defining a frame of reference and a rotor member movable relative to the stationary member about a rotation axis. The sensor includes field providing means for generating an electric field located at the stator member, the field providing means including a pole arrangement comprising an array of four source electrode means arranged adjacent to each other along a field line around the rotation axis. The field providing means includes an excitation signal generator for generating four equal frequency excitation signals at 90 degree increments of phase, each one of the four excitation signals being applied to a respective one of the four source electrode means such that a virtually moving electric field is created at the source electrode means so that the electric field effectively moves relative to the stator member along the field line. The sensor further includes a field sensor provided at the rotor member, the field sensor comprising sensor electrode means for sensing at any time a resultant electric field produced as a result of the excitation signals applied to more than one of the source electrode means, the field sensor being operable to generate an output indicative of the sensed resultant electric field whereby the output depends on relative angular position and speed between the stator member and the rotors member.

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First Claim