Substitution coefficient $\lambda_0$ for eddy-currents

Symbol
$\lambda_{0}$
Formulae
$\frac{3 d_{e}^{2} m_{0}^{2}}{4 s_{c}^{2} \left(m_{0}^{2} + 1\right)}$trefoil arrangement and non-flat formations
$\frac{0.375 d_{e}^{2} m_{0}^{2}}{s_{c}^{2} \left(m_{0}^{2} + 1\right)}$flat formation, other outer phase (leading 3/T/W)
$\frac{3 d_{e}^{2} m_{0}^{2}}{2 s_{c}^{2} \left(m_{0}^{2} + 1\right)}$flat formation, middle phase (1/R/U)
$\frac{0.375 d_{e}^{2} m_{0}^{2}}{s_{c}^{2} \left(m_{0}^{2} + 1\right)}$flat formation, outer phase with greater loss (lagging 2/S/V)