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What is the Difference: Maxwell Stress Tensor vs Lorentz Force Integration
Posted Feb 20, 2024, 5:43 p.m. EST Electromagnetics, Studies & Solvers, Physics Interfaces Version 6.2 1 Reply
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I am working on a simulation of a Linear Induction Motor.
With the Magnetic Fields Module, there is the Force Calculation Feature. There are two ways to read from the Force Calculation Feature: You can add an Integration Feature and integrate: intop1(mf.FLtzx) for example for the Thrust Force in my case. Or you can just read from the expression: mf.Forcex_motor for example. (This method uses the Maxwell Stress Tensor.)
However, I get different outcomes from both expressions. Why is this?
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Dear Joseph,
The first method you mention is to integrate the Lorentz force, that is JxB. This does not account for any induced magnetization so it can only be used to compute forces on non-magnetic, current-carrying objects. The second method (Maxwell Stress Tensor) is general so if a magnetic core is involved, that is what you should use.
Best regards,
-------------------Magnus