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Magnetodynamics - Step Response
Posted Aug 11, 2014, 11:24 a.m. EDT Low-Frequency Electromagnetics Version 4.4 1 Reply
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Hi, I have successfully modeled a solenoid using magnetostatics, and have achieved results (force on the armature) that are accurate when compared to actual test data. I would now like to take that one step further, and determine the transient response to a current step - the end result that I would like would be a force/time plot and a current/time plot.
However, I am stuck in changing the successful statics model into a dynamics model. I have added a new study with step 1 being "coil current calculation" and step 2 being "time dependent". I have added a step response function named "current_step" to the global definitions, which is a step from 0A current to the final 0.1A current.
I set the coil excitation for my Multi-Turn Coil physics to "current_step(t)[A}" but I get the warning "unexpected unit of input".
Also, the current is not simply a step input as I have defined in my "current_step" function - it is affected by the magnetization of the iron. How do I link these two together? Is it done automatically, or is there some link that I must define? If I provide a step input in voltage to the Multi-Turn Coil physics rather than a step input in current, will that cause the current to then be linked to the iron magnetization automatically?
However, I am stuck in changing the successful statics model into a dynamics model. I have added a new study with step 1 being "coil current calculation" and step 2 being "time dependent". I have added a step response function named "current_step" to the global definitions, which is a step from 0A current to the final 0.1A current.
I set the coil excitation for my Multi-Turn Coil physics to "current_step(t)[A}" but I get the warning "unexpected unit of input".
Also, the current is not simply a step input as I have defined in my "current_step" function - it is affected by the magnetization of the iron. How do I link these two together? Is it done automatically, or is there some link that I must define? If I provide a step input in voltage to the Multi-Turn Coil physics rather than a step input in current, will that cause the current to then be linked to the iron magnetization automatically?
1 Reply Last Post Aug 15, 2014, 2:29 a.m. EDT
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Posted:
1 decade ago
take a look at this example:
www.comsol.de/model/transient-modeling-of-a-capacitor-in-a-circuit-12695
From this model you can adapt the principle.
At the moment I've no access to comsol, I can send later a simple transient coil model.
www.comsol.de/model/transient-modeling-of-a-capacitor-in-a-circuit-12695
From this model you can adapt the principle.
At the moment I've no access to comsol, I can send later a simple transient coil model.