A single triangle-shaped voltage pulse is applied to the coil.
Number of turns N = 275;
Magnetic permeability of steel μ=1000;
Voltage pulse magnitude U = 100 V, pulse duration - 0.5 s.
Initial temperature T0 = +20°C
Calculate the switching current, heating power and temperature rise.
Analysis requires combined electromagnetic and heat transfer simulation. First the transient magnetic problem is simulated and current and Joule heat power are calculated at every moment of time. Then transient heat-transfer problem is simulated. Heat transfer problem takes the Joule heat power momentary values from the transient magnetic problem results.
Voltage and current vs. time plot:
Power and average temperature vs. time plot. Winding temperature rise is ΔT = 4°C.