Electric wire, coil, device for designing electric wire, and electric motor

摘要

An electric wire includes a conductive portion 11 made of a material having a volume resistivity higher than that of copper, wherein the volume resistivity of the conductive portion is specified so that, in a frequency range in which the electric wire is used, a ratio of AC resistance of the conductive portion 11 to AC resistance of reference copper wire is less than 1.

主权项

1. An electric wire, comprising:
a conductive portion made of a material having a volume 5 resistivity higher than that of copper, wherein an AC resistance value of the electric wire has a first frequency equal to an AC resistance value of a copper wire having the same diameter and length as the conductive portion, and a second frequency which is larger than the first frequency and has an AC resistance value of the electric wire equal to the AC resistance value of the copper wire between the first frequency and the second frequency, the AC resistance value of the electric wire is smaller than the AC resistance value of the cooper wire between the first frequency and the second frequency, a frequency range in which the electric wire is used between 1 kHz to 1 MHz and a volume resistivity of the conductive portion is specified so that the frequency in which th electric wire is used is set within a frequency range of between the first frequency and the second frequency, and a DC resistance value of the conductive portion per unit length obtained by dividing the volume resistivity of the conductive portion per unit length obtained by dividing the volume resistivity of the conductive portion by a cross-sectional area so that the second frequency is not less than the upper limit of the frequency in which the electric wire is used is specified by a relationship of
0.7×10(0.925×log10Rdc+2.24)≦f2≦1.3×10(0.925×log10Rdc+2.24)  [Equation 1] where Rdc (mΩ/cm) is the DC resistance value and f2 (kHz) is the second frequency.