Modable permanent magnet rotor for optimized field shaping
US5345130A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1993 |
| Grant date | Sep 6, 1994 |
| Priority date | — |
| Expiry date | Apr 28, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K1/2733
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnet rotor is shaped to optimize the flux distribution thereabout. In one embodiment, cut-outs in the rotor core between magnetic poles forces more of the magnetizing flux, i.e., that which would normally be distributed about the transition zone between the poles, into the main part of the poles, resulting in a substantially trapezoidal flux distribution that is substantially flat over approximately the central 120.degree. of each respective 180.degree. half-cycle thereof. In an alternative embodiment, the rotor core is shaped to be substantially square with rounded edges. Permanent magnet material is molded onto the square-shaped rotor core to form a plurality of magnetic poles such that the flux distribution about the rotor core is substantially sinusoidal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.