Ferromagnetic particle force - QuickField simulation example
A small ferromagnetic particle is placed next to the circular current currying loop of wire.
How to find force on ferromagnetic particles near current loops?
Answer Typical applications Geometry
Particle diameter 1 mm.
Given Task Solution Results
Flux density B(z) and gradient dB(z)/dz distribution along the ring axis:
Magnetic field distortion caused by the ferromagnetic particle.
Force acting on a particle as a function of distance from the ring center:
Engineering question
Set up an axisymmetric QuickField DC Magnetics problem for ferromagnetic particles near current loops and evaluate force from computed field results.
magnetic particle separators, ferromagnetic particle traps, magnetic filtration systems
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Simulation problem
Problem Type
Axisymmetric problem of DC magnetics
I = 50 A - current in the wire;
μ = 1000 - relative magnetic permeability of the particle.
Calculate the force acting on the particle placed at the axis of the ring as a function of the distance from the ring center.
Flux density distribution produced by the circular current could be calculated analytically. However, the particle causes local field distortion. Since the particle and ring feature cylindrical symmetry the model simulated as 2D axisymmetric. Axis of rotation is horizontal one.
LabelMover tool is used to automate the force vs. distance dependency calculation.
Flux density B(z) peak value is 0.78 mT (located at the ring center)
Flux density gradient dB(z)/dz peak value is 17 mT/m (located 2 cm away from the ring center)
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