Patent · US Active

Method for the no-transmitter speed determination of an asynchronous machine

US7495408B2 · kind B2 · utility

1Cited by

5References

10Claims

0Family size

Assignee

Jungheinrich AG · DE

Inventors

Christian Aleyt · Hamburg, DE
Nils-Peter Hansen
Frank Hormann · Westensee, DE
Torsten Hunte · Hamburg, DE

Key dates

Filing date	Jul 18, 2006
Grant date	Feb 24, 2009
Priority date	—
Expiry date	Apr 5, 2027

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S388/911
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method for the no-transmitter speed determination of an asynchronous machine, comprising the steps which follow: a module for field-oriented regulation calculates the voltages to be applied to the asynchronous machine on the basis of a setpoint for the speed, at least two values measured for the conductor current, and a speed calculated by an observer module, the observer module has applied thereto the voltage values obtained from the field-oriented regulation or the voltage values measured, and calculates a value of the moment-forming current îsq(t) and an inner moment Mi(t) of the asynchronous machine from the values applied, a moment module calculates a load moment Ml(t) acting upon the asynchronous machine from the difference of the moment-forming currents from the field-oriented regulation and the observer module, a speed module calculates the actual speed of the asynchronous machine via the load moment of the moment module and the inner moment of the observer module.

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