Coil pulse heating

QuickField simulation example

A single triangle-shaped voltage pulse is applied to the coil.

Engineering question
How to find transient heating in pulsed coils

Engineering answer
Set up an axisymmetric QuickField Multiphysics problem for a pulsed coil and evaluate transient heating from computed field results.

Typical applications
pulsed solenoid coils, electromagnetic actuators, duty-cycle coil systems

• Download simulation files (files may be viewed using any QuickField Edition).

Problem Type
Axisymmetric multiphysics problem of Transient magnetics coupled to Transient heat transfer.

Geometry

Given
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

Task
Calculate the switching current, heating power and temperature rise.

Solution
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.

Result
Voltage and current vs. time plot:

Power and average temperature vs. time plot. Winding temperature rise is ΔT = 4°C.

• Video: Coil pulse heating
  
• Download simulation files (files may be viewed using any QuickField Edition).