Eric,
The Millipak PMAC controller is Sevcon's older generation AC controller. According to the website "The Millipak™ PMAC controller operates in Trapezoidal or Sinusoidal waveform switching modes." The product that is listed under DC controllers is the Millipak 4Q which is a 4-Quadrant, brushed PM controller.
Tim
--- In electricboats@yahoogroups.com, "Eric" <ewdysar@...> wrote:
>
> Denny,
>
> Because an AC inductive motor needs true AC, I'm 98% sure that controllers like the Sevcon Gen4 are vector control because they can be used for an inductive motor as well as a PMAC motor.
>
> On the other hand, I'm about 90% sure that the Millipak is a BLDC block commutating controller because they list it as a DC controller, though I have not checked directly with the manufacturer.
>
> Fair winds,
> Eric
> Marina del Rey, CA
>
> --- In electricboats@yahoogroups.com, "dennis wolfe" <dwolfe@> wrote:
> >
> > Eric,
> >
> > Do you know for sure which type the Sevcon PMAC is?
> >
> > Denny
> >
> > ----- Original Message -----
> > From: Eric
> > To: electricboats@yahoogroups.com
> > Sent: Wednesday, September 08, 2010 8:34 PM
> > Subject: Re: [Electric Boats] Mars PMAC and Kelly Controller
> >
> >
> >
> > Doug,
> >
> > You should try to find out if the Mars PMAC is optimized for BLDC or A/C vector control. Here's some info about the differences:
> >
> > "Although BLDC motors are practically identical to permanent magnet AC motors, the controller implementation is what makes them DC. While AC motors feed sinusoidal current simultaneously to each of the legs (with an equal phase distribution), DC controllers only approximate this by feeding full positive and negative current to two of the legs at a time....
> >
> > Fair winds,
> > Eric
> > Marina del Rey, CA
> >
>
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