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Incredible experience ...DIY shunt dc motor

Started by leadsrobot, December 24, 2014, 01:06:44 AM

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TinselKoala

#5
December 24, 2014, 11:14:17 AM
@leadsrobot:
QuoteA coil pinball square serves me stator coil. it has a ferrite structure, the turns of the coil are oriented perpendicular to the magnets, In this case, there is no magnetic coupling between the rotor (magnet) and the stator (coil) in the repulsion phase whatsoever for north or south magnets.
(the hen loving north travel the power is off)

It seems to me from this statement that you may actually be using the Core Effect, rather than traditional electromagnetic attraction/repulsion to drive your motor! This would be really nice. But I can't really tell from the description if that is actually the case.

The Core Effect is due to a change in the permeability of the coil core material caused by the current in the coil. This reduces the attraction, both N and S, of any magnet to the core itself, when the current is on. So a core effect motor turns the coil on just as the rotor magnet passes the closest point of approach, so the rotor magnet isn't "dragged back" as much as it moves away. This can easily be mistaken for a "repulsion" but it really isn't. If the motor behaves the same way when the current to the coil is reversed (like with a DPDT switch) then you probably have a Core Effect happening.

Anyway, good luck and I'd love to see a video of your motor running.

leadsrobot

#6
December 24, 2014, 03:53:49 PM
@TinselKoala

Quote"I can't speak about much of your post because I'm not really understanding what you are describing about the "loud noise and the engine jumped net blocked", but I can tell you this much anyway


and suddenly a loud noise the rotor has stopped net and wooden frame and has jumped layer on one side as usual after the battery the engine continues to run at least one minute .

I think I have found a module to retrieve the CEMF / BEMF I would have in ten days,

These Modules can accept instantaneous input voltages ranging from 0.0V to +/-500V AC or DC, and input currents from 1nA to 400mA from energy harvesting sources that produce electrical energy in either a steady or an intermittent and irregular manner with varying source impedances and is then able to supply power from 1.8V to 3.6V
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