Patent · US Expired

Asynchronous electric machine

US4211946A · kind A · utility

2Cited by

11References

4Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Joachim Eckert · Bad Harzburg, DE
Franz Spirk · Berlin, DE

Key dates

Filing date	Apr 18, 1978
Grant date	Jul 8, 1980
Priority date	—
Expiry date	Apr 18, 1998

Classification

Technology area (CPC H)Electricity
CPC primaryH02K17/168
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

In an asynchronous machine including a rotor of solid iron and a squirrel cage winding, the rotor is further provided with closed slots of any cross sectional shape which receive the bars of the squirrel cage winding whose upper edge is spaced from the outer surface of the rotor by a distance which is equal to the depth of penetration a of the eddy currents generated for a given starting voltage and for a slip s.gtoreq.0.8.

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