四层音圈卷高近似公式
PER JIS C3202 GLASS 1 COPPER WIRE
线长L=Re*58.5*D^2/4*PI()*0.98圈数T==L*1000/(PI()*(Φ+骨架厚度*2+(1.04*D+0.022)*4))卷高H=(T/层数+2)*(1.04*D+0.022)*1.01