Coil

QuickField simulation example

DC voltage is applied to the coil. Calculate the switching current.

Engineering question
How to find solenoid switching transient current?

Engineering answer
Set up an axisymmetric QuickField Transient Magnetics problem for a switching solenoid coil and evaluate transient current from computed field results.

Typical applications
solenoid windings, electromagnetic actuators, switching coils

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

Problem Type
Axisymmetric problem of transient magnetics.

Geometry

Given
Conductor diameter 1 mm, copper electric conductivity 56 MS/m;
Relative permeability of steel 500;
Voltage U = 0.1 V.

Task
Calculate the current vs. time.

Solution
Since we do not know the time constant of the coil, we choose automatic time step option in problem properties.

Result
Coil switching current vs. time plot:

• Video: Coil