Dynamo-electric machine having tapered magnets secured to yoke
US6710493B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 2002 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | May 28, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K1/17
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A rotor and each magnet are configured to satisfy one of the following conditions: (D&pgr;/Z)Xn+T<X<(D&pgr;/Z)×(n+1)−T and (D&pgr;/Z)×(n−1)+T<X<(D&pgr;/Z)Xn−T. Here, Z is a number of cores. D is an outer diameter of the rotor. T is a circumferential dimension of a tooth of each core. X is a circumferential dimension between a circumferentially innermost one of first and second opposing points of a first tapered portion and a circumferentially innermost one of first and second opposing points of a second tapered portion. The first and second opposing points radially oppose first and second imaginary end circles, respectively, defined by outer peripheral surfaces of the cores. Furthermore, n is the number of the teeth that are entirely placed within a range defined by X when a circumferential center of one of the teeth is radially opposed to a circumferential center of the range defined by X.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.