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B 67
Joined: 23 Sep 2008 Posts: 277 Location: Stratford, Australia
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Posted: Wed Feb 18, 2009 10:41 pm Post subject: PWM - it's coming. |
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Earlier there were discussions on using Pulse Width Modulation to improve the slow speed and starting of T gauge trains.
I have enquired as to whether Eishindo are looking at developing this and Mr Hirai has sent me the following YouTube videos showing the development of such a control, which will become the next generation power box. He has told me this info is not confidential and my be published here.
_________________ Darren,
Stratford,
Australia.
Last edited by B 67 on Thu Feb 19, 2009 10:53 am; edited 1 time in total |
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trainspotter-usa
Joined: 04 Sep 2008 Posts: 315 Location: Minnesota
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Posted: Wed Feb 18, 2009 10:50 pm Post subject: |
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Oooh...
Third generation train.
... Wait a minute we haven't even got the second generation train yet!
Ian _________________ I CAN see how cool this stuff is!!!
http://more-t-please.blogspot.com/ |
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B 67
Joined: 23 Sep 2008 Posts: 277 Location: Stratford, Australia
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Posted: Wed Feb 18, 2009 10:55 pm Post subject: |
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The second generation train is the 1:32 scale model which has an extra reduction gear. _________________ Darren,
Stratford,
Australia. |
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victorian t gauge
Joined: 02 Nov 2008 Posts: 109 Location: traralgon, victoria, australia
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Posted: Wed Feb 18, 2009 11:57 pm Post subject: |
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WWWWWHHHHOOOOOOAAAAAA!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Wow! what an incredable low speed! the excitement i felt watching that footage! that is sooo impresive! PERFECT LIGHT VR BRANCHLINE RUNNING SPEED! I!! CANT!! WAIT!!!!!! |
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trainspotter-usa
Joined: 04 Sep 2008 Posts: 315 Location: Minnesota
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Posted: Thu Feb 19, 2009 12:03 am Post subject: |
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B 67 wrote: | The second generation train is the 1:32 scale model which has an extra reduction gear. |
Indeed it is.
It will be nice to get my trains to run that slow _________________ I CAN see how cool this stuff is!!!
http://more-t-please.blogspot.com/ |
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victorian t gauge
Joined: 02 Nov 2008 Posts: 109 Location: traralgon, victoria, australia
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Posted: Thu Feb 19, 2009 12:53 am Post subject: |
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i have still got a grin from ear to ear, from watching that footage! this new worm drive & pulse system, along with flextrack & switches should surley take t gauge from "boarderline toy" to a very professional modelers level. |
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B 67
Joined: 23 Sep 2008 Posts: 277 Location: Stratford, Australia
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Posted: Thu Feb 19, 2009 1:07 am Post subject: |
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Imagine what you should be able to achieve with PWM and the worm drive?
You'll notice that Mr Hirai has hinted at digital control too. The mind boggles at the possibilities this will bring (not to mention at the size of the decoders ).
What next? Flywheels? Well, perhaps not. Even if they could fit, I'd have doubts as to them being effective in such a tiny scale.
However, "Never say never" is certainly very applicable to KK Eishindo and T gauge. _________________ Darren,
Stratford,
Australia. |
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victorian t gauge
Joined: 02 Nov 2008 Posts: 109 Location: traralgon, victoria, australia
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Posted: Thu Feb 19, 2009 2:03 am Post subject: |
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never say never????? ILL HAVE A LIVE VR STEAM R CLASS please!!!! |
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B 67
Joined: 23 Sep 2008 Posts: 277 Location: Stratford, Australia
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Posted: Thu Feb 19, 2009 7:09 am Post subject: |
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victorian t gauge wrote: | never say never????? ILL HAVE A LIVE VR STEAM R CLASS please!!!! |
Wot!?!? You haven't made one already.
Heh heh! You know what I meant. _________________ Darren,
Stratford,
Australia. |
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David K Smith Chief Cook and Bottle Washer
Joined: 03 Sep 2008 Posts: 435 Location: New Jersey, USA
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Posted: Thu Feb 19, 2009 7:32 am Post subject: |
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victorian t gauge wrote: | i have still got a grin from ear to ear, from watching that footage! this new worm drive & pulse system, along with flextrack & switches should surley take t gauge from "boarderline toy" to a very professional modelers level. :) |
Took the words right out of my ... keyboard! Holy creepers, Batman, that is just stunning. _________________ —David
http://www.t-gauge.net/
http://1-450.blogspot.com/ |
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B 67
Joined: 23 Sep 2008 Posts: 277 Location: Stratford, Australia
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Posted: Thu Feb 19, 2009 8:02 am Post subject: |
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I don't know about anyone else, but I thought the sound from the pulse was reminiscent of the "chugchug" sound of a smaller diesel engine - like in a bus or rail motor. Some imagination may be needed here. Sound? Now there's a thought.
Flex track - as it was brought up. Mr Hirai has also told me that the following accessories are under development.
*Joiner track - this will be to join the flex track. Originally it was planned to sell a bag of gold joiners. However, it was realised that while some modellers would be able to use them, most users would not be able to handle them.
*Power cable plug for flex track.
*Turnout switch for flex track (with twin point blades).
Also, the controller will be available separately and the next batch of power box and track sets will come in a smaller package without the oval of track being pre-assembled. The pre-assembled oval was offered as a way of ensuring beginners, elders, women (keeping in mind that the first batch was originally for a mail order company) would have a properly assembled track to run their train on. It is easy in HO to join tracks with one rail above a joiner instead of in it. In T this is also easy and much harder to notice. At least it is until the train jumps off the rails. _________________ Darren,
Stratford,
Australia. |
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oztman
Joined: 14 Jan 2009 Posts: 34 Location: Sydney, Australia
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Posted: Thu Feb 19, 2009 10:06 am Post subject: |
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It looks as if there are some very exciting developments on the way. Now, pardon my ignorance, but in layman's terms what is PWM when it's home? _________________ Gary
Z scale, but very curious about T - and who knows? |
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B 67
Joined: 23 Sep 2008 Posts: 277 Location: Stratford, Australia
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Posted: Thu Feb 19, 2009 10:52 am Post subject: |
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oztman wrote: | It looks as if there are some very exciting developments on the way. Now, pardon my ignorance, but in layman's terms what is PWM when it's home? |
D'oh! I go to the trouble of using the full term in my opening post - but forgot to bold, italicize and underline it.
Now fixed.
Pulse Width Modulation.
Which means that instead of increasing and decreasing the voltage to control the speed of the motor, a series of pulses of the full voltage (4.5v in this case) is used (which is why it makes that sound in the videos). Low speed uses shorter pulses - say on for 5% of the time and off for 95%. The more time the pulse is on, the faster the motor turns. I hope that explains it enough. Here's an image that may help.
From http://www.netrino.com/Embedded-Systems/How-To/PWM-Pulse-Width-Modulation _________________ Darren,
Stratford,
Australia. |
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oztman
Joined: 14 Jan 2009 Posts: 34 Location: Sydney, Australia
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Posted: Thu Feb 19, 2009 7:18 pm Post subject: |
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Thanks Darren for that very lucid explanation. Is this technology used by other model railway manufacturuers? _________________ Gary
Z scale, but very curious about T - and who knows? |
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David K Smith Chief Cook and Bottle Washer
Joined: 03 Sep 2008 Posts: 435 Location: New Jersey, USA
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Posted: Thu Feb 19, 2009 7:49 pm Post subject: |
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oztman wrote: | Thanks Darren for that very lucid explanation. Is this technology used by other model railway manufacturuers? |
Others might contribute additional details, but many typical commercial packs offer "pulse" power that is not related to PWM. With "pulse" power, a DC waveform is superimposed over plain variable DC. This is accomplished by mixing half-wave, unfiltered AC with DC, and mostly because it's really simple and cheap to do.
There may be some higher-end commerical packs that deliver PWM that I don't know about (I usually "roll my own" power supplies, so I'm not intimate with the market), but I do know of several non-mainstream manufacturers of PWM controls; these add-on throttles accept AC from a separate transformer (provided by the modeler) and deliver PWM to the rails. _________________ —David
http://www.t-gauge.net/
http://1-450.blogspot.com/ |
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