Inductive angle sensor

Abstract

The invention relates to an inductive angle sensor (100) for determining a rotational position of a rotor (120) relative to a stator (110). The inductive angle sensor (100) includes an exciter coil (113), at least one pickup coil arrangement (111) having an m-fold symmetry and at least one conductive target (121) having an m-fold symmetry. The exciter coil (113) may excite the conductive target (121) which, in turn, may induce an induced signal (Si1) in the pickup coil arrangement (111). A signal analysis device (140) may determine the rotational position of the rotor (130) based on the induced signal (Si1). At least one conductive target (121) is non-directional. The sensor may comprise a second pickup coil arrangement (112) having an n-fold symmetry and a second conductive target (122) having an n-fold symmetry. The second conductive target induces a second induced signal (Si2) in the second pickup coil arrangement (112). The signal analysis device (140) may determine the rotationalposition of the rotor (130) based on the two induced signals (Si1, Si2) according to a Vernier principle.

Description

technical field [0001] Embodiments of the present disclosure relate to an inductive angle sensor comprising a rotor and a stator, wherein the relative rotational displacement between the rotor and the stator can be determined using inductive principles. Some exemplary embodiments may relate to a particular geometric symmetry of one or more objects comprised by the rotor, and some exemplary embodiments may relate to an orientation-free device comprised by the stator and / or by the rotor, respectively. Background technique [0002] Inductive position sensors can generally be used to determine the relative displacement between two components that are movable relative to each other, wherein the determination of the relative displacement is based on the principle of electrical induction. For example, an inductive angle sensor can determine the relative linear or rotational displacement between two members. In the latter case, the first member may comprise a stator and the second ...

AI Technical Summary

Problems solved by technology

However, they may be susceptible to interference from external magnetic fields

Furthermore, they may only have limited resolution relative to their angular measurement range

Furthermore, the relationship between the phase and magnitude of the measured induced current may be ambiguous over the full 360° revolution

That is, certain pairs of values ​​(phase, magnitude) may occur more than once over a full 360° revolution, which makes the determination of the angular displacement ambiguous because it introduces uncertainty into the determined angular displacement

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