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3 phase exitation [SOLVED]
Posted Feb 25, 2016, 11:30 a.m. EST Low-Frequency Electromagnetics Version 5.1 1 Reply
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Hi all,
Using the AC/DC module I am trying to make an 2D model of an linear induction motor. I am looking to perform a frequency domain analysis of the system. At the moment however I can not seem to get my phasors defined correctly so that they are agree with the frequencies set in the solver.
I take it one would define the phasors as:
real(I_max * exp(i* (freq + phase_offset)))
If anyone can send me on the right track I would be much obliged.
Using the AC/DC module I am trying to make an 2D model of an linear induction motor. I am looking to perform a frequency domain analysis of the system. At the moment however I can not seem to get my phasors defined correctly so that they are agree with the frequencies set in the solver.
I take it one would define the phasors as:
real(I_max * exp(i* (freq + phase_offset)))
If anyone can send me on the right track I would be much obliged.
1 Reply Last Post Feb 25, 2016, 1:23 p.m. EST
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Posted:
8 years ago
Found a sollution to the problem. Will quickly cover it in case anyone else faces similar issues.
real(I_max * exp(i* (freq + phase_offset))) = real(I_max * exp(i*freq) * exp(i*phase_offset))
As one can see we can split the definition of our phasor into two exponentials. The frequency domain analysis of comsol allways performs a scaling of the first frequency dependant exponential (exp(i*freq)). If you want to add an phase offset to a certain frequency dependent variable in comsol one simply has to multiply by: exp(i*phase_offset), Here the "phase_offset" is ofcourse in radians.
real(I_max * exp(i* (freq + phase_offset))) = real(I_max * exp(i*freq) * exp(i*phase_offset))
As one can see we can split the definition of our phasor into two exponentials. The frequency domain analysis of comsol allways performs a scaling of the first frequency dependant exponential (exp(i*freq)). If you want to add an phase offset to a certain frequency dependent variable in comsol one simply has to multiply by: exp(i*phase_offset), Here the "phase_offset" is ofcourse in radians.