Controller circuit for Hilden Brandt motor needed..

[wattsup]

@Honk

Again sorry to hear of this burn up.

You know that Otto has been  burning alot of mosfets. I know I am null in EE matters but can you tell me if the ground of the mosfets is in the path of the flyback from the motor. If applied power gets stuck in the motor and the rotor does not turn to start fast enough, watch out. I think also that Jack should consider using some off the shell controller just to get better measurements for you to work with. Either that or your idea of having someone there with Jack when he does the test would be a great. This could go on for months, back and forth, before the proper parameters are achieved. Maybe Jack can send you the motor so you could work on the circuit with the real mackoy.

One last point is that since you are developing and making the circuit, there could be some simple little things that have been overlooked in the circuit, but you cannot see it being so into it. I am not knocking you abilities at all. I get called sometimes by other dealers to fix water treatment machines for problems that the main service guy just can't see cause he is so "immersed" in the system. Sometimes it takes someone from the outside. Do you have anyone like this to speak to in confidence?

[Schpankme]

... Motorcycle can run up to about 10,000 rpm's with 'points' ...

Hello JackH,

Sorry for the confusion; my thoughts were that you used the Motorcycle points as a ' timing device / spark gap' to pulse DC to the Coils.

- Schpankme

[JackH]

Later,,,,,,JackH
.

[Schpankme]

Hello JackH,

Honk if you like electric cars !

- Schpankme

[Honk]

I have received the controller from Jack and I have some better news this time.

The output 1200V IGBT:s were OK.
The BEMF recycle unit was OK.

But the AC-DC converter was fried, both the step down mosfet and the push-pull mosfets.
These components are not directly coupled to the valves and wont break down due to any "out of range" BEMF spike.
I believe the controller broke down this time for some other reason.
Perhaps I just need to strengthen the top level capacity of the AC-DC converter.

I'll continue fixing it and then test it really hard. Even harder than I usually do. Like a 350W load test.