Control apparatus for two-speed compressor
US3935519A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1974 |
| Grant date | Jan 27, 1976 |
| Priority date | — |
| Expiry date | Jan 24, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/934
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The disclosure describes a refrigerant compressor of the type driven by a motor capable of operating at a low speed and a high speed, the motor including first, second and third stator coils. First, second and third temperature sensors are located adjacent the first, second and third stator coils, respectively, for detecting any change in temperature of the coils. If the temperature of any of the stator coils exceeds a perdetermined value, a control device operates a switch in a pilot circuit that turns off the motor before damage from excessive heat can occur. A unique contactor assembly utilizing both electrical and mechanical interlocks interconnects the stator coils to provide two speed operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.