I have modelled BLDC machine which will start from zero speed and run upto 3000 rpm. I am simulating bothways with maxwell circuit editor & simplorer . The problem is motor speed will varry as simulation goes further but if I keep time step constant corresponding to final speed then simulation time is very long. Hence how to specify speed dependent time step in setup? Any special expression is availbale?
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Speed dependent time step in Maxwell Circuit Editor & SImplorer
4 февраля, 2018 - 16:30
#1
empulse
You have not to do so. Time step should be suitable for change of excitation, not speed. Speed is deriviate of torque and torque is depended from current.
Also, you can build expression with variable "Speed", or use dataset with PWLX function.
Thank you for your reply.
I think a little bitexplanation is needed from my side.
The motor will be started/accelerated from 3-phase inverted modelled in Maxwell circuit editor from zero speed.Load torque i have modelled using equation. I want to keep time step corresponding to one degree electrical throughout zero speed or say 1rpm to 3000 rpm. So, how can I specify such variable speed dependent time step is my doubt.
Do I understand correctly that the frequency of the voltage changes in the process of increasing the speed? ? For example, you have a sinusoidal signal, you must use 10 points for a period, at a minimum. Accordingly, at a low speed and frequency, a large step is used. Аt a high speed the step should be decreases proportionally. If you want to use time depend time step, you should see my recomendation about "Speed" variable and dataset.
When i write wirte time step = (60 / Speed * 360) in transient set up ... it gives error.
I modified your expression a little bit. See pictures in private message.
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