The negative impulse delivered by the pms rapidly decays to zero as soon as the timing switch is closed. Hence the larger your magnets, the longer the pulse duration required, the harder it becomes to obtain 'cold current.' However, too small a magnet, and no 'yaw to register' is manifested - ESSENTIAL for the generation of the negative impulse in the first place. Push only motors can only ever be hot current devices. My basic conclusion is that magnets of diameter 15-20mm are the sweet spot for the Adams motor. They yaw to register nicely, but also deliver reasonably short pulse lengths. Some people have complained these magnets are hard to find - so I have proved they are not, and produced this list of suppliers. I have not ordered or used these magnets, so I can not vouch for them, but they all look fine to me. Also I can not vouch for whether grade 5 or 8 magnets are better, since I have not done that experiment. But anything other than the inferior grade 1 ceramics should work okay. The only downside is that they are thin - in which case just carefully epoxy 4 of them together to make one long magnet. The result should closely approximate to my rather nice 18mm x 18mm x 25mm custom cut magnets.
Basic Hall ic circuit. Make sure you buy 5 extra Hall ics. I've already blown 2. They are a little fragile if mistreated. Banded side of Hall ic faces the S pole rotor magnets. I suggest starting with just one stator -these things can be a pain to wind, although 24awg is fairly easy to work with, and two stators in series can be tried once you are up and running. Bifilar winds are worth the hassle. They do perform better. In order to send the 'back emf back to source, you simply need to substitute the pnp for a mosfet. Try both to see the difference. It is considered good practice to wire a diode in parallel with a mosfet, to protect it from reverse voltage spikes. When fitted with a mosfet and an appropriate rechargeable battery, source drain is minimal. Because timing is done directly off the pole faces of the magnets, pulse duration is dynamically reduced automatically as speed increases, which is very helpful. And yes, the pnp / mosfet is wired backwards, but this is because the current flows backwards. The emf pulse leaves the battery, enters the stator windings, where a transduction operation is performed upon the current, turning it into time negative emf, which then flows BACKWARDS into the source. Finally, this circuit is only suitable for magnets of 18mm diameter, or very close to that value. If using 25.4mm magnets (1"), you will be forced to use 555 circuitry to adjust the pulse width down to get proper results.
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