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

[ajwright@ozemail.com.au (Ashley Wright)]

On Sun, 7 May 2000 00:48:15 +1000, "William Miller"
<backtran@optusnet.com.au> wrote:

>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.
>
  Yes the voltage foes need to be inverted, and I think into three
phases as well. Interestingly Perth's trains (or at least the
originals) operate off an AC overhead but have DC motors. But I guess
technology has changed a bit since then.
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 Ashley Wright, Canberra, Australia                                                         
 www:  http://www.ozemail.com.au/~ajwright                   
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