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Re: [NSW] 3 phase AC propulsion system (was: Millennium Train sets)
- Subject: Re: [NSW] 3 phase AC propulsion system (was: Millennium Train sets)
- From: Andrew Price <aprice@mail.dotcom.fr>
- Date: Sun, 02 Apr 2000 03:13:36 +0200
- Newsgroups: aus.rail
- Organization: SWW
- References: <8c11ug$cdh$1@nnrp1.deja.com> <38E48CBD.F01B2409@ozemail.com.au> <38e48d7f$0$5047@news01.syd.optusnet.com.au> <38E4A999.B6D03847@ozemail.com.au> <oneF4.60263$3b6.236415@ozemail.com.au> <38E691DF.D4A3FC0B@ozemail.com.au>
- Xref: bclass.spectrum.com.au aus.rail:5182
On Sun, 02 Apr 2000 10:18:39 +1000, David Johnson
<trainman@ozemail.com.au> wrote:
>Chris Downs wrote:
>
>> I've found the acceleration/deceleration whine on the IMUs and SMUs to be
>> more noticeable than on G7.
>
>Are you sure that isn't the Oil cooling fan you can hear?
No.
AC traction packages vary the voltage and frequency to control the
power output of the drive motors and this is *very* audible. There is
no mistaking a three-phase drive with either a DC drive or its
ancillaries.