High-Speed Cryogenic Alternator Development. Volume 1
Final rept. Mar 1968-Sep 1969, on Phase 1
GENERAL ELECTRIC CO SCHENECTADY NY MECHANICAL ENGINEERING LAB
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The goals of this report are to define the basic problems and then establish a sound engineering basis for the design of high-speed high-efficiency compact alternators to operate at cryogenic temperatures. The engineering basis used was to make an alternator electromagnetic design suitable for an existing General Electric expansion turbine design, all operating on gas-lubricated bearings at speeds up to 180,000 rpm, with an electrical power output of 100 watts. A permanent magnet alternator was designed, manufactured, and tested at both room temperature and cryogenic temperatures. The alternator was tested with leading, unity, and lagging power factors. At cryogenic temperatures, in the order of 100K -280F, tests were conducted and the turboalternator was evaluated at speeds up to 220,000 rpm, and with electrical power output values up to 109 watts. An alternator electromagnetic efficiency as high as 98 percent was measured.
- Electric Power Production and Distribution
- Solid State Physics