Patent ID: 11940342
Assignee: INFINEON TECHNOLOGIES AG
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 13:
14. A torque sensor system, comprising:
a rotatable input shaft;
a rotatable output shaft coupled to the rotatable input shaft, the rotatable input shaft and the rotatable output shaft having a common rotation axis and forming a torsion angle between one another when torque is transmitted in response to rotation of the rotatable input shaft;
a first target coil coupled to one of the rotatable input shaft or the rotatable output shaft and being disposed coaxially about the common rotation axis, the first target coil being astatic and having a k-fold rotational symmetry of a first periodicity;
a second target coil coupled to the other one of the rotatable input shaft and the rotatable output shaft and being disposed coaxially about the common rotation axis, the second target coil being astatic and having a k-fold rotational symmetry of a second periodicity that is different than the first periodicity;
a first pickup coil system having two first pickup coils disposed coaxially about the common rotation axis, the two first pickup coils each being astatic and having a k-fold rotational symmetry that is the same as the first periodicity;
a second pickup coil system having two second pickup coils configured to be disposed coaxially about the common rotation axis, the two second pickup coils each being astatic and having a k-fold rotational symmetry that is the same as the second periodicity; and
stator circuitry configured to calculate the torsion angle based upon signals induced in the two first pickup coils via inductive coupling with the first target coil and based upon signals induced in the two second pickup coils via inductive coupling with the second target coil,, wherein the k-fold rotational symmetry of the first periodicity being different than the k-fold rotational symmetry of the second periodicity reduces mutual coupling between the first target coil and the second target coil.