The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 26, 2026
Filed:
May. 11, 2021
Ixblue, Saint-Germain-en-Laye, FR;
Bernard Vau, Saint-Germain-en-Laye, FR;
Mehdi Bussutil, Saint-Germain-en-Laye, FR;
EXAIL, Saint-Germain-en-Laye, FR;
Abstract
Method for estimating angular errors of coders in a looped system including a rotating actuator, an angle coder producing a position measurements, and a calculation device controlling the actuator, said device receiving a setpoint signal and the position measurements, for looping, and calculating in a corrector a control signal. In a test phase, a specific corrector C(q) is synthesised for a constant rotation speed ω, the corrector having zero gain at the corresponding frequency and harmonics, resulting in opening the loop, a matrix relation is established between position measurements and a function of parameters characterizing coder errors and torque ripples, the test phase repeats with different rotation speeds, the matrix relations are concatenated producing an identifiable global matrix relation, the parameters are estimated by resolution of the global matrix relation.