초록

In a motor driven centrifugal compressor having a diffuser containing a movable wall for varying the width of the diffuser passage, control equipment is provided for continually changing the wall position in response to changes in motor current.

대표청구항 ▼

A method of controlling a motor driven centrifugal compressor used in a refrigeration system that includes movably mounting at least one wall in a compressor diffuser so that the size of the diffuser opening may be varied, developing a theoretical condenser water schedule curve for optimum operation

A method of controlling a motor driven centrifugal compressor used in a refrigeration system that includes movably mounting at least one wall in a compressor diffuser so that the size of the diffuser opening may be varied, developing a theoretical condenser water schedule curve for optimum operation of the compressor, relating the water schedule curve to the motor current and the wall position so that desired wall positions can be determined from motor current values, measuring the motor current and determining a desired wall position, sensing the actual position of the movable wall, comparing the actual position of said wall to the desired position of said wall, moving said wall to the desired position in the event the actual position is different than the desired position.