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VARIABLE FREQUENCY SPEED CONTROL OF REFRIGERATION COMPRESSORS.

Author(s) : GARSTANG S. W.

Type of article: Article

Summary

IN THE FIRST OF THESE TWO ARTICLES, THE ADVANTAGES OF VARIABLE SPEED COMPRESSOR CONTROL ARE DESCRIBED. THESE INCLUDE MATCHING COMPRESSOR CAPACITY TO LOAD, HENCE OPERATING AT THE HIGHEST EVAPORATING AND LOWEST CONDENSING PRESSURES. LOSSES DUE TO CYCLING ARE REDUCED AND ULTRA-LOW SUCTION PRESSURE IS AVOIDED. ENERGY SAVING SHOULD BE CONSIDERABLE. AN EXPLANATION FOLLOWS OF CONTROL TERMINOLOGY AND BASIC CONTROL MODES. SYSTEM COMPONENTS FOR VARIABLE SPEED ARE DESCRIBED WITH WARNINGS REGARDING MINIMUM SPEED FOR COMPRESSOR LUBRICATION AND INVERTER INEFFICIENCY AT LOW FREQUENCIES. TYPES OF INVERTER USED ARE EITHER SIX STEP OR PULSE WIDTH MODULATED. INVERTER DESIGN IS DISCUSSED FURTHER IN THE SECOND ARTICLE, INCLUDING ADJUSTMENTS TO MATCH THE INVERTER TO THE COMPRESSOR MOTOR, BOOSTING VOLTAGE/FREQUENCY RATIO TO GIVE STARTING TORQUE, SPEED CHANGE, LIMITS, STALL PROTECTION AND COMPATIBILITY WITH MOTORPROTECTION. D.W.H.

Details

  • Original title: VARIABLE FREQUENCY SPEED CONTROL OF REFRIGERATION COMPRESSORS.
  • Record ID : 1991-1564
  • Languages: English
  • Source: H&V Eng. - vol. 63 - n. 702
  • Publication date: 1990/08
  • Document available for consultation in the library of the IIR headquarters only.

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