Re: [NSW] AC traction motors for Tangara's?

["William Miller" <backtran@optusnet.com.au>]

I think what this might be about is that the supply voltage would remain as
is (ie 1500VDC) but the actual traction motors would be run on AC that
provide some performance and maintenance cost benefits.

How this is done (remember I am a mech eng not a elec eng) is by inverting
the supply 1500VDC into AC for the motors. Interestingly enough IIRC even if
the overhaed was AC it would still be necessary to have the inverters for
control purposes.


David Martin <d_martin@mountains.net.au> wrote in message
BFUQ4.38$Od2.2627@nsw.nnrp.telstra.net">news:BFUQ4.38$Od2.2627@nsw.nnrp.telstra.net...
> I'm not an electrical engineer, but is this possible?
> Obviously they couldn't convert everything overnight, so for a period of
> time they would either have AC motors running on a DC supply, or
vice-versa.
>
> Perhaps they could fit on-board rectifiers to enable DC units to run on an
> AC supply?
>
> How economically viable is it to convert the system over to AC? Cost
versus
> benefit?
>
> --
> David Martin
> Web Developer
> Info Blue Mountains - Blue Mountains Info
> http://info.mountains.net.au
>
>
>
> Jonathan Lau <jonlau@ozemail.com.au> wrote in message
> 3913DCC6.F868C35F@ozemail.com.au">news:3913DCC6.F868C35F@ozemail.com.au...
> > Here's an interesting piece from the May 2000 edition of the ARHS
> > Bulletin:
> >
> > "A 4-car Tangara set was fitted with AC traction motors as a trial by
> > last December. If successful, the whole fleet may be fitted with these
> > traction motors in lieu of the normal DC motors."
> >
> > Does anyone know if it when ahead and which set it is?
> >
> > AFAIK, only "G7" is fitted with AC traction motors.
> >
> > Jon Lau
> >
>
>
>