Konzept zur Rotationsmessung eines Rotors eines Elektromotors

Details

Veröffentlichungs-Nr.

EP4764421

Anmeldetag

20. Dezember 2024

Veröffentlichung

24. Juni 2026

Rechtsraum

EP

IPC

G01D5/244, G01D18/00

Abstract

A rotation measurement of a rotor (12) of an electric motor (10) is achieved by an apparatus (50) comprising magnetic field sensors (301..3) statically arranged in proximity to the rotor for measuring magnetic fields generated by magnetic poles (20) of the rotor so that sensor signals of the magnetic field sensors change at borders (36) between sectors (32) into which a full revolution of the rotor is partitioned. The apparatus configured to - receive a sequence (38) of time durations between consecutive changes of the magnetic field sensors' output signals, - determine a current average revolution time duration of the rotor based on a sum of M recent time durations of the sequence of time durations, wherein M≥N and N is the number of sectors, - store, for each sector, a stored length value (62) which indicates the length of the respective sector or a deviation of the length of the respective sector from an ideal sector length, and update, based on the current average revolution time duration of the rotor and a current time duration of the sequence of time durations, the stored length value for a current sector to which the current time duration relates, and - use the stored length values of the sectors for performing a measurement of a rotation of the rotor.

Anmelder

Firma

maxon international ag

Land

🇨🇭 Schweiz

Fachgebiete