Commutator having segments with a varied dimension
US4433263A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1982 |
| Grant date | Feb 21, 1984 |
| Priority date | — |
| Expiry date | Jun 23, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K13/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A commutator has a plurality of spaced, electrically conducting segments, each of which has a physical dimension determining the relative time duration of brush contact with said segment during commutator rotation with audible brush noise being generated between the brush and said consecutive segments, the noise including a fundamental frequency component at a frequency related to the frequency at which the consecutive segments pass the brush. The physical dimension of the consecutive segments varies from each segment to the next according to a predetermined pattern effective to vary the relative time of brush contact from each segment to the next during rotation and thus reduce the amplitude of the fundamental frequency components to make the brush noise less tonal in character and thus less annoying.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.