5 inch battery loco speed controller

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5 inch battery loco speed controller

This topic has 7 replies, 6 voices, and was last updated 27 September 2024 at 11:27 by Phil Barber.

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25 September 2024 at 19:47 #755822
Philip Major
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@philipmajor52482
Hi, I am starting to build a class 37 5 inch gauge battery loco. It will have 4 off 24v fasco motors and multiple battery’s etc. Rather than buy a speed controller, such as an IDrive ( sensible I know), I would however like to build my own. Searching the Internet shows lot of examples for small dc controllers, but I can’t find anything for a big enough one I want. I am not an electronic experienced person, but a can follow a plan, or bill of materials. Can any one help? I have read some books, enough to know it can be done, but its all Klingon to me! Need something in ley terms
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25 September 2024 at 20:39 #755830
Bazyle
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@bazyle
There was one in ME about 30 years ago. Rex Nicholls tram engine. Very simple, just update for more modern components.
26 September 2024 at 13:42 #755968
Phil Barber
Participant
@philbarber30745
With 4 off motors, why not just wire them in

Off

Series

Series – Parrallel

Parrallel

with relays. This would give a nice clunky response! For a more elaborate control, use a swiched mode voltage regulator (diesel engine speed simulaton), or add some high power resistors and a fan in the roof!

No idea if it would work, just some thoughts.
26 September 2024 at 14:39 #755977
duncan webster 1
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@duncanwebster1
<p style=”text-align: left;”>If you dont have coupled axles then wiring motors in series is not ideal. If one axle loses adhesion, it speeds up and it’s back emf goes up. This cuts the current to both the slipping current and it’s series friend.</p>
26 September 2024 at 18:27 #756041
Robert Atkinson 2
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@robertatkinson2
There is a circuit on this thread 😉

Parkside Electronics

Robert.
26 September 2024 at 21:39 #756080
Ed Dinning 1
Participant
@eddinning1
Hi Phil, if you are located in the north east I may be able to help as I spent quite a bit of my working life designing these controllers

Ed
27 September 2024 at 11:19 #756173
Phil Barber
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@philbarber30745
Sadly its not me making it, but any detailed discussion on this is fascinating.
27 September 2024 at 11:27 #756175
Phil Barber
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@philbarber30745
On 26 September 2024 at 14:39 duncan webster 1 Said:

<p style=”text-align: left;”>If you dont have coupled axles then wiring motors in series is not ideal. If one axle loses adhesion, it speeds up and it’s back emf goes up. This cuts the current to both the slipping current and it’s series friend.</p>

Good point! It would make driving a lot more exciting though! Howabout dual wound differential voltage relays lighting a wheel slip indicator bulb? It is a hobby after all.
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