Current control via speed control for driving screw compressor under cold conditions
US9145893B2 · kind B2 · utility
2Cited by
9References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 21, 2011 |
| Grant date | Sep 29, 2015 |
| Priority date | — |
| Expiry date | Oct 28, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C2270/701
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
When starting a screw-type air compressor in sub-zero conditions, current spikes are mitigated by detecting an over-current condition and/or a below-threshold temperature, and a warm-up routine is initiated in which compressor motor speed is ramped in a sawtooth fashion between two speeds that are substantially lower than a nominal operating speed of the compressor motor. In this manner, the internal components of the compressor are warmed prior to fully starting the compressor, which mitigates current spikes, reduces blown fuses, and extends the life of the compressor motor and other compressor components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.