Pulse Motors- Your building them wrong.

[MagnaProp]

Got a coil wound up. Getting close to having it all mounted so I can add some power. Any last recommendations on how to power it up without burning stuff up? A coil seems kind of like a dead short to me. When I was little I wound some wire around a nail and connected it up to my model trail controller similar to the one shown here. It worked for a minute then I cranked up the juice and the train controller let out the magic smoke. I've never tried that since.

I recall the videos said to limit the amps to no more than 2. I'll have to check again for what voltage to use. Perhaps an electric thermometer would hel? That way I could keep tabs on the temp without risking getting shocked by touching it, to see if it's getting warm.

[Thaelin]

Remember TM's coil is 5 ohms as is mine. Another one I had was 1.5 and would take 3 amps easy at 30 volts and gave little pull factor. The on I have now is very close to the pull of the mags. Need a scale to set the wattage needed. I would bet your coil is say .5 ohms.
thay

[Jimboot]

Hi Jim.
No, it is much the same.
The only change is the coil triggering system.
I now use a hall switch to switch on the transistor. I just glued 4 small PMs on the flywheel to trigger the hall.
This removes all those blades we were using in the opto interrupter system.

I see in your last video, you got down to just 7mA draw, with all those big blades attached to the flywheel.
Was that including the recycling of the inductive kickback ?, or was that just been burnt off ?

Brad

No recycling of kickback as was discussed in the other thread - https://youtu.be/D1lEQGVD1lk

[MagnaProp]

Remember TM's coil is 5 ohms as is mine. Another one I had was 1.5 and would take 3 amps easy at 30 volts and gave little pull factor. The one I have now is very close to the pull of the mags. Need a scale to set the wattage needed. I would bet your coil is say .5 ohms.
thay

My multimeter is saying about .6 ohms so you were right. I need to watch those videos again. I just need to mount the scale then I can finally start some tests. I have a new found respect for how fast tinman puts together his builds.

[Thaelin]

A big thanks Jim, you cleared up one of my misgivings on how this could work. Seeing this in action showed the operation I could not visualize. Now it fits and get this up. I am having some med issues as of late that are getting in the way of things. Will be mounting the tabs this weekend after drilling the rotor plate.


Can you tell me what voltage you were using with the 28ma draw? Looking forward.


thay