Controller circuit for Hilden Brandt motor needed..

[Honk]

I'm sorry to report another failure.
The controller broke down at 800 RPM, just as the last time.
Jack checked the controller and there was nothing loose inside.

But while it worked the motor picked up speed really fine.
So the controller is operating the motor correctly.
Now I have to find the weak spot that is the cause of these failures.

I'll get it back for investigation and improvements one week from now.

[JackH]

Later,,,,,,JackH

[hydrocontrol]

Darn.. I for one was hoping that this would work. How far apart do you guys live. It seems like it is time for a road trip for Jack to visit Honk and bring the motor along. This postal service development route seems to be taking forever.

[Honk]

Well, Jack lives in the States and I live in Europe.
So we will just have to continue to rely on the postal service. 

When the controller is returned I'll fix it and try to find the cause of the error.
I will also lower the starting voltage from 63V down to 45V to make the initial run smoother.
If the BEMF circuit broke down I'll lower the BEMF level down to 750V to make headroom
for a heavy duty 900V Mosfet capable of returning three times as much BEMF power.
If the output IGBT:s is broken I'll swap then for another type that might work better.
If the AC-DC converter is smoked I'll use even more powerful Mosfets to enhance the capacity.

If everything is smoked I'll scratch my head and say "what the f-ck" and swap all for the better.

I guess we'll will have to wait and see how it develops another time around.
On the next run it would be good if maybe Dingbat could be present and take measurements
on the outputs using a oscilloscope with a high voltage prope. Then I could get to know if the
BEMF exceeds 1200V. The BEMF circuit should keep it lower than that but if the recycling
capacity is to low, the BEMF voltage could shoot higher than 1200V and kill the IGBT:s.

[gaby de wilde]

keep up the good work guys.

In stead of high rpm you could also try bursts of pulses.

It will do less work but generate loads of back emf.