Armature connection resistance measuring method and apparatus
US5140276A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 2, 1991 |
| Grant date | Aug 18, 1992 |
| Priority date | — |
| Expiry date | Apr 2, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for testing the resistance of armature commutator connections and the resistance values of individual windings uses a pair of independent constant current sources connected across opposite pairs of armature windings through their respective commutator bars. The constant current sources are identical in output current and are connected in opposite polarity to minimize circulating current flowing in other windings of the armature. The voltages developed across windings adjacent the two current sources are combined and are a function of the resistances of the connections between the windings and the commutator bars. The voltages across each constant current source represent the resistance of the winding to which it is connected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.