Patent · US Expired

Method for improving the efficiency of an electrical machine

US6744240B2 · kind B2 · utility

18Cited by

19References

7Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Gerhard Koelle · Wiernsheim, DE
Kurt Reutlinger · Stuttgart, DE
Begir Pushkolli · Ludwigsburg, DE

Key dates

Filing date	Jan 25, 2002
Grant date	Jun 1, 2004
Priority date	—
Expiry date	Jan 25, 2022

Classification

Technology area (CPC H)Electricity
CPC primaryH02P9/04
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method for operating an electrical machine (1) for the production of electrical power (13) includes an excitation winding (2) and a stator winding (4). A converter configuration (6), e.g., a pulse-width modulation inverter, is located downstream from the electrical machine (1). In the lower speed range, the output of electrical power (12) takes place along the torque line (29) independently of the number of coils w1, w2 in a stator winding (4). In the upper speed range, the output of electrical power (12) takes place via a stator winding (4) having a small number of coils w2.

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