Hello Everyone,
I have strange situation that my PMSM controller switches off when I put
high load.
I observe then 95A on fets.
I found that reverse shottky diodes influences it.
When I putted two SK54C in parralel then I did not observed that switching off.
I thought that I simply require more forward current on reverse diode, but when
I applied 40A (http://pl.farnell.com/vishay/vft4045bp-m3-4w/diode-schottky-45v-40a-ito-220ac/dp/2115198)
one then it even got worse.
I do not see it to be a software thing, because as I even checked I am far from top values for
control variables.
I think that it is something inside h-bridge that is causing it.
Maybe overheat, or wrong snubber circuit.
My circuit:
How do you see it?
Best regards,
Chris
I have strange situation that my PMSM controller switches off when I put
high load.
I observe then 95A on fets.
I found that reverse shottky diodes influences it.
When I putted two SK54C in parralel then I did not observed that switching off.
I thought that I simply require more forward current on reverse diode, but when
I applied 40A (http://pl.farnell.com/vishay/vft4045bp-m3-4w/diode-schottky-45v-40a-ito-220ac/dp/2115198)
one then it even got worse.
I do not see it to be a software thing, because as I even checked I am far from top values for
control variables.
I think that it is something inside h-bridge that is causing it.
Maybe overheat, or wrong snubber circuit.
My circuit:
How do you see it?
Best regards,
Chris