Process and apparatus for correlating startup and cutoff periods of different induction motors with one another
US4518899A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 14, 1984 |
| Grant date | May 21, 1985 |
| Priority date | — |
| Expiry date | Mar 14, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P3/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In textile machinery wherein two or more loads--such as transport rollers of a tension frame and a bank of spindles carrying take-up spools--are driven by respective three-phase motors of the asynchronous (induction) type at speeds which are different from each other but are to be mutually correlated during an entire operating cycle including a startup and a cutoff period, the motor with the shorter acceleration time is slowed down during startup to let it reach its operating speed substantially at the same time as the other motor whereas the motor with the longer deceleration time is braked during cutoff in order to reach standstill substantially simultaneously with the other motor. The slowdown during startup and the braking during cutoff can be controlled by a comparator which determines deviations of the speed ratio of the two motors from a predetermined reference value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.