Patent · US Expired

Method and circuit arrangement for controlling an asynchronous motor supplied from a static frequency changer

US4263542A · kind A · utility

9Cited by

6References

4Claims

0Family size

Assignee

Brown, Boveri & Cie AG · DE

Inventors

Helmut Schulze · Großwallstadt, DE
Klaus Moll · Bischofswerda, DE

Key dates

Filing date	Nov 27, 1978
Grant date	Apr 21, 1981
Priority date	—
Expiry date	Nov 27, 1998

Classification

Technology area (CPC H)Electricity
CPC primaryH02P23/08
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

Method for controlling the speed and torque of an asynchronous machine fed through a static frequency changer with impressed intermediate current link, a control variable for the frequency of the current delivered by the frequency changer being formed from an electrical variable corresponding to a slip frequency value and an electrical variable corresponding to actual value of a frequency proportional to the rotor speed of the asynchronous machine which includes operating the asynchronous machine with constant flux in a region of constant maximal torque, and adjusting the flux in the machine, in a region of constant maximal power, as a function both of voltage at commutating capacitors of a self-commutating inverter and of a respective load condition of the asynchronous machine.

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