METHOD FOR CALIBRATING A ROTARY ENCODER

摘要

A method for calibrating a rotary encoder, in particular an incremental encoder, of an electrical machine, wherein the encoder has a number of reference marks and outputs a sine track and a cosine track. The electrical machine can be regulated to a specific speed, an angle of the electrical machine is determined with the aid of the sine track and/or the cosine track, from this an angular progression over time is ascertained, an oscillation in the angular progression over time with a frequency of substantially one integral multiple of the product of the specific speed and the number of reference marks is ascertained, and from this a correction factor the sine track and/or the cosine track is derived, wherein the amplitude of the oscillation is less than or equal to a limiting value. The invention further relates to an encoder evaluation and an electric motor having a rotary encoder.

主权项

1. A method for calibrating a rotary encoder an electric machine that outputs a sine track and a cosine track and has a line count, the method comprising:
regulating the electric machine a specific speed; determining an angle of the electric machine based on the sine track and/or the cosine track; determining an angular progression over time; determining an oscillation in the angular progression over time with a frequency of substantially an integral multiple of the product of the specific speed and the line count; deriving a correction factor of the sine track and/or the cosine track via which an amplitude, a phase, and/or an offset of the sine or cosine track are adjusted; and selecting the correction factor such that with a change in the particular track by the correction factor and a repeated determination of the angular progression over time by the track modified by the correction factor, the amplitude of the oscillation of the angular progression over time is less than or equal to a limiting value.