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Simulating controller accurately

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TechAUmNu
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Joined: 2017-09-22 01:27
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Simulating controller accurately

I have been trying to find a way to accurately know what voltages will be seen by the high side fets with different motors. So I would set the resistance and inductance of the motor and can see the peak voltages.

Using the simulation that Benjamin made in LTSpice shows very small voltage peaks which I don't really believe.

If I just model one phase path with 2 IRF7769 mosfets, then it looks much more realistic. Plus you can model the motor phase much better. 

 

So if I run a simulation 16S with 9.6uH 13mOhm motor I get spikes up to 72v with about 80A motor current.