Patent · US Expired

Method of determining the rotational speed of a brushless DC-motor

US5198738A · kind A · utility

12Cited by

12References

6Claims

0Family size

Assignee

Heidelberger Druckmaschinen AG · DE

Inventors

Peter T. Blaser · Dielheim, DE
Michael Kruger · Aachen, DE
Jurgen Maass · Wiesloch, DE
Helmut Meyer · Hilden, DE

Key dates

Filing date	Oct 30, 1991
Grant date	Mar 30, 1993
Priority date	—
Expiry date	Oct 30, 2011

Classification

Technology area (CPC H)Electricity
CPC primaryH02K29/10
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method of determining the rotational speed of a three-phase brushless DC-motor, which comprises scanning at least one signal trace disposed on a revolving rotor of a three-phase brushless DC-motor by means of three sensors, each emitting a signal having two possible signal states, the signal trace and the sensors being of such construction and arrangement that eight values are realized by a logical combination of the two possible signal states, respectively, of the three sensors; detecting the rotor position with six of the values; and determining the rotational speed with the other two values.

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