Crankcase heater systems and methods for variable speed compressors
US9810218B2 · kind B2 · utility
0Cited by
38References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 23, 2014 |
| Grant date | Nov 7, 2017 |
| Priority date | — |
| Expiry date | Oct 18, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B2600/021
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A system includes a compressor having a shell housing a compression mechanism driven by an electric motor in an on state and not driven by the electric motor in an off state. The system also includes a variable frequency drive that drives the electric motor in the on state by varying a frequency of a voltage delivered to the electric motor and that supplies electric current to a stator of the electric motor in the off state to heat the compressor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.