NASA Glenn Research Center Program In High Power Density Motors For Aeropropulsion

NASA Glenn Research Center program in high power density motors for aeropropulsion Description:
Original publisher: Cleveland, Ohio : National Aeronautics and Space Administration, Glenn Research Center, [2005] OCLC Number: (OCoLC)649501034 Excerpt: ... Mounted in the more confined slots of the motor, the coils are not as well cooled by LN. 2 Measurements of coil resistance installed in the motor in liquid nitrogen are shown in figure 12. The close-packed coil loses nearly half of its area exposed to liquid nitrogen when in the motor and begins to heat substantially above 20 A. The coils with fully spaced end turns are usable to 50 A or more. Note that 2 this gives a current density in the motor slots of �� 50 A / mm if the coils are wound with 100 percent dense 2 square packing. Note that this is not far below the 63 A / mm reported for superconducting rotor coils operating at 27 K ( ref. 19 ). However, it must be noted that the rotor application is much more difficult NASA / TM - 2005-213800 11

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