No, the high power three-phase unit is _really_ tight integration. the
heatsink for the FETS is the mounting plate between the motor and gearbox.
The leads route about four inches. The battery is also attached here with
about 3 inch leads.
The smaller unit is used in a bunch of different mechanical arrangements.
Some of those can range to about 15 inch motor leads.
The two units are connected with about three feet of cable, gnd, 28V, and
CAN bus.

-Denny



On Fri, Nov 29, 2013 at 8:34 AM, Marcel Duchamp <
marcel.duchamp@sbcglobal.net> wrote:

> Looks like a tough problem to solve!
>
> When you got to the point where the fets live but the driver dies, it
> rang a bell for me.  We had a totally different sort of system to what
> you have but were having random failures of a charge pump IC.  Long
> story short, it was due to poor wiring practice: a ground wire that
> should have tied two local circuits together had them both going out 3
> or 4 feet and then tied together.  System current demands would cause an
> inductive spike on the ground wire and fry the particular component.
>
> With your power controller, do you have the motor loads mounted
> remotely?  If so, look at the wiring and think of each wire as an
> inductor and see if you can visualize a scenario that causes spikes to
> occur.
>
> Good luck!
>
>
> On 11/29/2013 7:09 AM, Denny Esterline wrote:
> > I've come across some weirdness in the motor control PWM module on the
> > dsPIC33fj128MC804 and I'm hoping for some useful suggestions.
> >
>
>
> > Suggestions greatly appreciated.
> >
> > Thanks,
> > -Denny
> >
>
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