Die-cast copper rotors for improved motor performance

모터 성능 향상을 위한 다이캐스트 구리 로터

Authors

J.G. CowieCopper Development Association Inc., New York, NY, USAD.T. BrenderCopper Development Association Inc., New York, NY, USA

Abstract

Aluminum has been the common conductor material for the squirrel cage of the induction motor largely because of ease of manufacturing by pressure die casting. Short die life in die casting the higher melting copper resulting in high production cost has prevented the copper rotor from attaining a place in integral horsepower motors. Because of its higher electrical conductivity, copper in the rotor reduces energy losses. Data presented in this paper show that in addition to reduced rotor losses and improvement in overall electrical energy efficiency, an important derivative benefit is reduced motor operating temperature which will lead to longer motor life and reduced maintenance costs in high duty cycle motors. Overall motor losses as measured in laboratory dynamometer tests using IEEE Specification 112B were reduced by 14 to 23% in copper rotors compared to aluminum counterparts. Other performance characteristics of copper rotor equipped motors are described. A short summary of tests of high temperature die materials and their use in die casting copper is presented.

Keywords

• IEEE Keywords
  • Copper,
  • Rotors,
  • Die casting,
  • Aluminum,
  • Conducting materials,
  • Costs,
  • Temperature,
  • Induction motors,
  • Manufacturing,
  • Production
• INSPEC: Controlled Indexing
  • squirrel cage motors,
  • rotors,
  • energy conservation,
  • losses,
  • electrical conductivity,
  • casting,
  • copper
• INSPEC: Non-Controlled Indexing
  • die-cast copper rotors,
  • squirrel cage,
  • induction motor,
  • integral horsepower motors,
  • electrical conductivity,
  • energy losses reduction,
  • electrical energy efficiency,
  • motor life extension,
  • reduced maintenance costs,
  • high duty cycle motors,
  • IEEE Specification 112B,
  • high temperature die materials,
  • Cu

References

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