# Eddy Current Constant

on . Posted in Electrical Engineering

Eddy current constant, abbreviated as $$K_e$$, also called eddy current coefficient, is a parameter used in formulas to calculate the magnitude of eddy current losses in a conductor.  It is specific to the material and shape of the conductor.  The eddy current constant is derived from the material properties of the conductor, particularly its resistivity and conductivity, and it takes into account the geometry of the conductor.

The eddy current constant quantifies the relationship between the material's electrical resistivity and conductivity, which determine how efficiently eddy currents are induced and subsequently dissipated as heat in the conductor.  This constant is used in formulas that calculate eddy current losses in various electrical devices and systems.

### Eddy Current Constant formula

$$K_e \;=\; pi^2 \;/\; 6 \; \rho$$
Symbol English Metric
$$K_e$$  = eddy current constant depends on the materials resistivity and geometry $$dimensionless$$
$$\pi$$ = Pi $$3.141 592 653 ...$$
$$\rho$$ (Greek symbol rho) = resistivity of the conductor material - $$ohm-m$$