Compressor cutoff control responsive to shaft position
US5015153A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1989 |
| Grant date | May 14, 1991 |
| Priority date | — |
| Expiry date | Jul 14, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B2207/03
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The load torque of a compressor for circulating refrigerant in a refrigerating cycle changes with the rotational position of the shaft of the compressor, and the phase difference between the primary current and voltage of an induction motor for driving the compressor changes with the load torque. Taking the above facts into consideration, in turning off the compressor driven by the induction motor, which is powered by a fixed frequency AC power source, the shaft position of the compressor is detected in accordance with the phase difference, and the current of the motor is turned off at the timing of a particular phase difference when the load torque becomes minimum, thus reducing vibration when the compressor is stopped.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.