Tiny Pulse Motor

My smallest yet: Built using the insides of an old Microsoft wheel mouse, this motor had the intention of proving scale. I’m delighted with it as it currently sits, proving that inertia from a heavier wheel need not be necessary for smooth running at such a size. There are 4 magnets, little pieces that came from incorrect magnet snaps and whatever else, in previous experiments…just a clump of bits that now have a use. All can be same direction facing on pulse motors, but I used N/S/N/S in this case. The U18 Hall sensor hadn’t been used on such a motor before (normally DN6851) so I just played safe. It switches well and right down below quoted datasheet figures to around 2.4V. A 1K resistor connects between the Positive rail and the Base of the transistor, to make sure the sensor switches properly. Transistor is a NPN 30611, which seems proprietary to the circuit board it came from, but very similar to a 3904 or C945. A 1N4148 limits any collapse spike that may be generated by the tiny coil, itself coming from a 5V relay. This is now to form an experiment in BEMF collection and whatever tiny semblance of battery charging may be possible. Perhaps 1.2V AA’s 🙂 Also, as the basis for R/C helicopter powering…an alternative to brushless motors. If the end of the spindle were to run through a 1:1 cog, the motor would spin one way, the rotor the other. This would help to negate usual single rotor problems and remove the need for multiple rotors out f the top of small palm

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