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

Claim 23:
24. The torque sensor system of claim 14, wherein the stator circuitry is configured to calculate the torsion angle (delta) by:
performing amplitude demodulation and normalization of the signals induced in the two first pickup coils to provide a first set of signals a, b that are normalized to a predefined amplitude;, performing amplitude demodulation and normalization of the signals induced in the two second pickup coils to provide a second set of signals c, d that are normalized to the predefined amplitude;
calculating an intermediate quantity A using at least one of (i) arctan 2{b+d, a−c}, or (ii) arctan 2{a+c, d−b};
calculating an intermediate quantity B using at least one of (i) arctan 2{b+d, a+c}, or (ii) arctan 2{a−c, d−b};
calculating the torsion angle delta by iteratively evaluating the equation:

delta=C1*A+C2*B+C3*m2,

using different values for m2 until a solution for the torsion angle delta is identified that lies within a predetermined range of allowable torsion angles,
wherein each of the coefficients C1, C2, and C3 are predetermined values dependent upon the k-fold rotational symmetry of the first target coil and the k-fold rotational symmetry of the second target coil.