초록 ▼

A method is presented to prevent compressor damage by reducing compressor load when operating speed either is too low or too high as can be the case at extremes of line frequency and voltage. The speed of the compressor is deduced from the knowledge of compressor load, frequency and voltage. If the

A method is presented to prevent compressor damage by reducing compressor load when operating speed either is too low or too high as can be the case at extremes of line frequency and voltage. The speed of the compressor is deduced from the knowledge of compressor load, frequency and voltage. If the compressor speed is too high or too low for a given suction and discharge pressure, the compressor load is reduced to boost the operating speed or to reduce force acting on the bearings. The compressor load reduction may be achieved by actuating an unloader valve, a suction throttling device, or some other load reduction mechanism.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of operating a compressor comprising the steps of:(1) providing an electric motor for driving a compressor, and a control for monitoring a characteristic indicative of the speed of the compressor as driven by said electric motor;(2) operating said compressor an

[ What is claimed is:] [1.]1. A method of operating a compressor comprising the steps of:(1) providing an electric motor for driving a compressor, and a control for monitoring a characteristic indicative of the speed of the compressor as driven by said electric motor;(2) operating said compressor and monitoring a characteristic indicative of the speed of said compressor; and(3) reducing a compressor load if the monitored speed is outside of a predetermined range.