| 摘要 |
PURPOSE:To restrict a heat generation of a driving motor and reduce a power consump tion by a method wherein a fan for a blower for cold refrigeration and a driving motor for the fan are installed within a box having a thermal insulation and a coil of the driving motor is constituted by a high temperature superconductor. CONSTITUTION:A thermal insulation box 1 is formed by an outer casing 5, an inner box 6 and a thermal insulation material 7. As a driving motor 11 is installed within the casing, the interior of the casing is cooled normally to -20 deg.C--30 deg.C with cold air fed from an evaporator 9, so that if a coil 115 of the driving motor 11 is made of ceramic high temperature superconductor which becomes a superconductor at a temperature of -23 deg.C, for example, a resistance is almost zero. In view of this fact, even if a motor current of any value is apt to flow, no loss of Joule heat is produced. Therefore, copper loss is not generated and there is no fear that heat is generated. When the coil 115 of the driving motor 11 is formed by a high temperature superconduc tor, it is not necessary to consider a resistance of the coil 115 and so an ampere turn can be increased as much as possible. In this way, since the copper loss and iron loss of the driving motor 11 are restricted, no heat generation and no useless power consumption result.
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