Harmonic distortion reduction in inductive position sensors
AssigneeSemiconductor Components Industries, LLC
InventorJacques Jean BERTIN
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Abstract
An inductive position sensor can include a first target coil, included in a target, and including a first outer lobe that has a size based on a first shift ratio of a harmonic period of a receiver coil, and a first inner lobe having a size based on a second shift ratio of the harmonic period where the harmonic period corresponds with a harmonic and the first shift ratio is different from the second shift ratio. The inductive position sensor also include a second target coil including a second outer lobe having a size based on the second shift ratio, and a second inner lobe having a size based on the first shift ratio.
Claims20
An inductive position sensor, comprising:
- a first target coil, included in a target, and including:
- a first outer lobe having a size based on a first shift ratio of a harmonic period of a receiver coil, and
- a first inner lobe having a size based on a second shift ratio of the harmonic period, the harmonic period corresponding with a harmonic, the first shift ratio being different from the second shift ratio;
- and
- a second target coil including a second outer lobe having a size based on the second shift ratio, and a second inner lobe having a size based on the first shift ratio,
- the first target coil configured to induce a first waveform associated with the harmonic into the receiver coil, and the second target coil configured to induce a second waveform associated with the harmonic, and opposite the first waveform, into the receiver coil such that the harmonic is nullified in a receiver coil voltage.
An inductive position sensor, comprising:
- a first target coil, included in a target, and including:
- a first outer lobe having a size based on a first shift ratio of a harmonic period of a first receiver coil, and
- a first inner lobe having a size based on a second shift ratio of the harmonic period, the harmonic period corresponding with a harmonic, the first shift ratio being different from the second shift ratio, the first target coil introducing a first value of the harmonic into a first receiver coil voltage generated by the first receiver coil inductively coupled to the target;
- and
- a second target coil including a second outer lobe having a size based on the first shift ratio, and a second inner lobe having a size based on the second shift ratio,
- the second target coil introducing an opposite value of the harmonic into a second receiver coil voltage generated by a second receiver coil inductively coupled to the target, and
- the harmonic being nullified, by a control unit coupled to the first receiver coil and the second receiver coil, in an angular position signal based on the first receiver coil voltage and the second receiver coil voltage for the harmonic.
An inductive position sensor, comprising:
- a first target coil, included in a target, and including:
- a first outer lobe having a width based on a first shift ratio of a harmonic period of a receiver coil, and
- a first inner lobe having a width based on a second shift ratio of the harmonic period, the harmonic period corresponding with a harmonic, the first shift ratio being different from the second shift ratio;
- and
- a second target coil including a second outer lobe having a width based on the second shift ratio, and a second inner lobe having a width based on the first shift ratio,
- the first target coil inducing a first waveform associated with the harmonic into the receiver coil, and the second target coil inducing a second waveform associated with the harmonic, and opposite the first waveform, into the receiver coil such that the harmonic is nullified in a receiver coil voltage.
Dependencies are inferred from the claim text.