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Three-phase induction motor for variable speed refrigerator compressor.

Number: pap. ID: 766

Author(s) : MALLAMPALLI S., BOHORI A., SUBRAMANIAM P., et al.

Summary

A major part of the power consumption in the low-wattage reciprocating compressors, used for household refrigeration units, is associated with the motor. A variable speed compressor as opposed to a single speed compressor is known to provide energy savings due to its ability to match the load demand from the pump more closely to the power demanded by the pump. The current article presents an overview of the design, optimization and test methodology for a variable-speed, three-phase induction motor, for a speed range of 2000-4500 RPM - the lowest speed determined to ensure proper lubrication of the pump and the highest speed determined by the maximum load expected to be experienced by the motor. A DOE-based transfer function for the motor efficiency was developed and then used for maximizing the motor efficiency over the operating speed range and torque requirements. The optimization was done using a genetic algorithm routine with appropriate manufacturability and operational constraints. A model based vector control strategy was also developed for operating the motor at the desired speed while delivering the torque-demand to the pump over the desired speed range. The algorithm was implemented on a NI LabVIEW FPGA Real Time Module. An intelligent power module was used to drive the three-phase motor. Finally, load tests would be performed on a dynamometer to evaluate the performance of the motor and controller over the entire speed and load ranges.

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Pages: 8 p.

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Details

  • Original title: Three-phase induction motor for variable speed refrigerator compressor.
  • Record ID : 30001852
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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