Determining asynchronous motor couple
US4419625A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1980 |
| Grant date | Dec 6, 1983 |
| Priority date | — |
| Expiry date | Dec 5, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/343
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device determines the mean power absorbed from a current supply by measuring the current in a phase, and the voltage between two phases, determining the product thereof, and integrating the product. A first potentiometer provides a proportion of the voltage which is an image of the current, and subtracts it from that voltage between phases. A second potentiometer provides a proportion of the voltage between phases and subtracts if from the product. A third potentiometer provides a proportion of a constant voltage and subtracts it from that product. The third potentiometer is adjusted so that the output power of the integrator shall be zero when the motor rotates under no-load condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.