12V 200A Synchronous PWM DC Motor Controller

[bbrc679]

Can anyone help me fundamentally configure a synchronous PWM DC motor controller? I am trying to reverse engineer a missing component. The first component is a variable 40A PWM that used to be connected to a "box" which I suspect was a fixed PWM. I need to achieve 12V 200A peak for about 30 seconds. (If you must know, it is for a gyrocopter rotor blade pre-rotator...)

 

[Minder]

Do you mean build (configure) a 200amp PWM controller, what is the nature of the motor, 3ph synchronous or DC brushed or BLDC?
M.

 

[bbrc679]

It is a heavy duty 12V auto starter motor.

 

[Minder]

Is it PM field or wound field?
Older and larger automotive starter motors are series/wound field and operate in a runaway condition and require a load at all times.
M.

 

[bbrc679]

I will have to check.

 

[bbrc679]

BLDC. I can find a 200A PWM, but I was curious how linking 2 in synchronous mode works.

 

[Minder]

I would never have expected a starter motor to be BLDC adding the cost for a commutation circuit.
By synchronous, I assume each to be in syncronism with each other?
M.

 

[bbrc679]

That is correct.

 

[Minder]

Probabally more details have to be known about any present controller, I would think that essentially you need feed back of some kind on both units, and either have one master and slave or use a μp to synchronize each to a set rpm.
M.