Permanent magnet type synchronous machine
US5942873A · kind A · utility
Inventor
Key dates
| Filing date | Apr 17, 1998 |
| Grant date | Aug 24, 1999 |
| Priority date | — |
| Expiry date | Apr 17, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2201/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a synchronous machine, an armature structure has n (n being a positive integer) salient poles provided at predetermined circumferential distances around a rotary shaft and coils wound on the salient poles respectively, and a field system is constituted by (n-1) permanent magnet pieces arranged like a ring as a whole around the rotary shaft closely to radially outer ends of the salient poles of the armature structure, the respective permanent magnet pieces being magnetized radially so that north and south poles are alternately arranged respectively on inner circumferential surfaces of the permanent magnet pieces, and each of boundary lines between adjacent ones of the permanent magnet pieces is inclined at a predetermined angle relative to a direction parallel to the rotary shaft in such a manner that when the radially outer ends of the salient poles opposite to the inner circumferential surfaces of the permanent magnet pieces are circumferentially developed and projected onto a development where the inner circumferential surfaces of the permanent magnet pieces are circumferentially developed and when a certain one of the boundary lines comes between two of the salient poles adja…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.