The Processing of High Temperature Ceramic Superconducting Devices. Volume 2
SUPERCONDUCTOR TECHNOLOGIES INC SANTA BARBARA CA
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BEI has completed the preliminary evaluation on the planar coil and conductor requirements for the brushless DC motor. Results indicate that current density is adequate, however, there is not enough cross section of the conductor using the thin film approach. Preliminary design was based on two planar coils attached on each side of a central chill plate filled with liquid nitrogen. Evaluation was further performed on the output anticipated in thick film substrates 100 times thicker than the 1 micron thin film. Estimates with thick film substrates yielded .168 watts output which is still inefficient for DC brushless motor design. Thick film designs appear to be the correct approach to achieve a high conductor cross section enabling sufficient power levels to drive the actuator or motor.
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