Re: Melbourne trams

brett.fitzpatrick@employment.gov.au
Wed, 01 Apr 1998 18:40:46 -0600

In article <35223458.FE23B4B7@ozemail.com.au>,
trainman@ozemail.com.au wrote:
>
> D. Lindstrom wrote:
>
> > What does the expression "dynamic braking" mean
>
> Dynamic Braking is when traction motors have resistors placed across them to
> provide a retarding effect.
>
> --
> David Johnson
> CityRail Guard
> trainman@ozemail.com.au
> http://www.ozemail.com.au/~trainman/
>
>
What resistors?

Forgive my ignorance, but doesn't "Dynamic Braking" usually mean that the
traction motors have their fields reveresed so that they then act as
generators?

For electric units, the term describibg this is called "Regenerative
Braking", commonly abbreviated to "Regen."

AFAIK the difference between them is that "Dynamic Braking" applies to
Diesel-Electric Units where the power generated is disippated as heat energy
through resistor grids, and that "Regenerative Braking" applies to Electric
Units where the power generated is fed back into the overhead wiring.

David, your reply would slow the motor down as it wouldn't be getting enough
power. Or I have bitten hook, line and sinker! ;-)

Brett

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