Means to reduce harmonic torque in electromagnetic machines
US4739201A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1986 |
| Grant date | Apr 19, 1988 |
| Priority date | — |
| Expiry date | Jul 25, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electromagnetic machine of the type having a moving member and a stationary member, with a set of structures on the moving member to magnetically interact with a set of structures on the stationary member, has an improved construction comprising displacing by an angle of displacement, .alpha..sub.m, from their normal positions, a first portion of one set of structures whereby the displacement causes a harmonic of the fundamental torque/angle curve to be attenuated. The angle of displacement is determined by the following relationship: EQU .alpha..sub.m =.alpha..sub.e /p, where PA1 .alpha..sub.e =displacement in electrical degrees, PA1 p=number of moving member magnetic pole pairs, PA1 further where .alpha..sub.e =180/h, PA1 where h=an integer equal to the number of a harmonic of the fundamental torque/angle curve to be attenuated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.