Patent · US Expired

Method and apparatus for measuring a frequency datum

US6496786B1 · kind B1 · utility

33Cited by

11References

26Claims

0Family size

Assignee

Papst Motoren GmbH & Co KG · DE

Inventors

Roland Dieterle · St. Georgen, DE
Hermann Rappenecker · Vöhrenbach, DE
Alexander Hahn · Roetgen, DE

Key dates

Filing date	Sep 19, 2000
Grant date	Dec 17, 2002
Priority date	—
Expiry date	Feb 17, 2021

Classification

Technology area (CPC H)Electricity
CPC primaryH02P7/288
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An improved method, for obtaining a datum concerning the rotation speed (n) of a rotating object, such as a motor rotor (32), offers high precision. Typically, the motor has a sensor (61) which supplies a sensor signal that has, for each revolution of the rotor, a plurality A of events such as pulses or pulse edges which are counted by a microprocessor (23) associated with the motor. In order to keep the computation load on the microprocessor from increasing as the rotor speed increases, yet maintain high precision, the measurement is done over a full rotation of the rotor, starts at a first signal event (176), and ends after a third or nth signal event (182) which happens at the same rotational position as the first signal event.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.