A new approach to field modelling

de dk es fr it cz ru cn

RSS Twitter Facebook Linkedin YouTube

>> >> >>

Bobbin deformation caused by winding force of wiring

Problem Type:
Axisymmetric problem of stress analysis.



Winding force, F = 50 N.

Calculate the bobbin deformation caused by the winding force.


Let's consider the winding process. Winding force leads to a wire elongation. After the force is removed the wire shrinks back and squeezes the bobbin.
The similar effect may be achieved by cooling down the loose wiring. To simulate wire shrink it is convenient to use temperature-based elongation effect.

Relative elongation of the wire according to the Hooke's law is

dL/L0 = F / (E·Sw), where
E - Young modulus, Pa;
F - Force, N;
Sw - cross section of the wire, m2;
L0 - initial length of the wire, m.

Relative elongation of the wire according to the thermal expansion law is

dL/L0 = α·dT, where
α - coefficient of the thermal expansion, 1/K;
dT - temperature difference, K.

Hence the temperature difference (that would cause the same wire elongation as by mechanical winding force):

dT = 1/α · F/(E·Sw)

We apply this temperature difference to the loose wire to simulate the wire shrink pressure.

coil winding thermal expansion


Calculation of the bobbin deformation in QuickField

coil winding bobina deformation

View movie Download video.

Watch online on YouTube.

Download PDF icon View simulation report in PDF.

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

There are no restrictions applied to the QuickField Student Edition postprocessors.
You can view field maps, make plots, calculate integrals and print pictures in the same way that the Professional Edition users do.