Patent · US Expired

Method and apparatus for DC motor speed control

US5845045A · kind A · utility

34Cited by

21References

40Claims

0Family size

Assignee

Papst Motoren GmbH & Co KG · DE

Inventors

Frank Jeske · Tennenbronn, DE
Arno Karwath · Rottweil, DE
Hermann Rappenecker · Vöhrenbach, DE

Key dates

Filing date	Nov 17, 1994
Grant date	Dec 1, 1998
Priority date	—
Expiry date	Nov 17, 2014

Classification

Technology area (CPC H)Electricity
CPC primaryH02P2209/07
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A memory device, e.g. a capacitor, is provided for a collectorless DC motor. This component is charged whenever a particular rotor position is reached. In so doing, a voltage value or quantity on this memory device is changed. This quantity is compared to another quantity, which is dependent on a desired parameter, e.g. ambient temperature or gas or dust concentration. A reference signal is produced when a particular reference criterion is satisfied. The difference between the beginning of this reference signal and a second predetermined rotor position, which follows the initial predetermined rotor position with respect to time, is measured, and on the basis of this measurement, the current flow of the collectorless DC motor is influenced or regulated. In particular, the current can be toggled on and off as the rotor passes certain predetermined positions.

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