Variable speed compressor motor control for low speed operation

Details Variable speed compressor motor control for low speed operation Variable speed compressor motor control for low speed operation

2005-06-07

2010-12-21

Norman, Marc E (Department: 3744)

Refrigeration

Automatic control

Refrigeration producer

C062S228400

Reexamination Certificate

active

07854137

ABSTRACT:
A variable speed drive is provided for a compressor in a refrigerant system. When a low load situation has been determined by the refrigerant system controls, the variable speed drive moves the compressor to a lower speed mode of operation. In this case, if a speed is so low that it cannot ensure adequate oil lubrication of the compressor elements, then the motor speed is periodically increased to a level that will ensure proper lubrication. In this manner, a variable speed drive compressor can be operated at an extremely low speed to precisely match load demand on a refrigerant system. The invention can be extended beyond refrigerant system applications and to any oil-lubricated compressors whose lubrication is speed dependant.

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International Preliminary Report on Patentability dated Dec. 27, 2007.
Search Report PCT/US2005/020123.

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