| 摘要 |
<p>PURPOSE:To obtain a resistance value whose ratio to reactance is large enough even if standard wires are employed by a method wherein an air-core reactor is constituted by a plurality of coaxial air-core coils whose directions of the windings are opposite to each other and at the same time the respective coils are connected to each other in parallel. CONSTITUTION:If air-core coils 1 and 2 have directions of wirings opposite to each other and are arranged coaxially, the fluxes generated by the two air-core coils 1 and 2 cancel each other. Therefore, a resultant reactance X' of the two coils is approximately 10% of the reactance of a single air-core coil. At the same time, as the respective air-core coils 1 and 2 are connected in parallel, a resultant resistance value R' is approximately a half of the resistance of a single air-core coil. Therefore, R'/X' is approximately 1.5/10 or 0.15. A mutual coupling coefficient of the two air-core coils which determines the resultant reactance can be chosen to be an optional value close to one by selecting average diameters or the like properly so that the resultant resistance can be so designed as to have a required value against the resultant reactance.</p> |
