Pole changeable three phase winding
US4144470A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1977 |
| Grant date | Mar 13, 1979 |
| Priority date | — |
| Expiry date | Jun 30, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K3/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pole changeable three phase winding for a fractional pole pair ratio p.sub.1 :p.sub.2 = (3m .+-. 1)/3n with p.sub.2 = 3n being an integral multiple of the number of phases and m and n being positive integers. Each phase winding for the first number of poles 2p.sub.1 consists of 2p.sub.1 /t equal winding branches, of which a number G, divisible by three, of so-called base winding-branches carry current for the first number of poles 2p.sub.1 and for the second number of poles 2p.sub.2, where one third of each of the base winding branches, for the second number of poles 2p.sub.2, are assigned to all three phase windings. The remaining number N of winding branches are designed as zero branches which are ineffective for the second number of poles 2p.sub.2, so that a division into G base winding branches and N zero branches according to G + N = 2p.sub.1 /t takes place, where t is an integral divisor of 2p.sub.1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.