Brush wear monitor having mounted flags interactable with an impedance dependent switch
US8120503B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2009 |
| Grant date | Feb 21, 2012 |
| Priority date | — |
| Expiry date | Jun 10, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H3/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A worn brush monitoring system for monitoring a plurality of brushes of an electrical machine comprises a plurality of mounted flags configured to be in moveable communication relative to a wear of each of the plurality of brushes and an electrical recording circuit. The electrical recording circuit includes at least one impedance device configured to provide impedance data, at least one switch having a contact plate interactable with at least two of the plurality of mounted flags at different points along a length of the contact plate and an impedance dependent on the length of the contact plate, and a recording device configured to detect changes in electrical characteristics in the electrical recording circuit resulting from changes in a switch state, the switch state defined by the interaction between the mounted flags and the electrical recording circuit, as a result of brush wear.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.