| 摘要 |
PROBLEM TO BE SOLVED: To reduce copper loss due to proximity effect at high frequency. SOLUTION: A coil for electric equipment is constituted by using an electric wire (10) for coil, formed by plating a copper wire (1) sectioned in a rectangular shape with a soft magnetic material thin film (2) and baking insulating enamel (3) on its outer periphery, and winding it around a coil roll (a) in a solenoid shape such that long-side corresponding surfaces of the electric wire cross section face each other. A magnetic field produced with a flowing current is blocked by the soft magnetic material thin film (2) to hardly reach a copper portion. Accordingly, an increase in copper loss due to proximity effect at high frequency is suppressed. COPYRIGHT: (C)2010,JPO&INPIT
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