Magnetic Coupling of new SSG.
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Uploader Comments (Pwordchernoir)
All Comments (6)
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I think that it would be fun to have pulse motor speed competitions, just for the fun of it. Everybody just has to agree to use the same model of 12V battery, and demonstrate the motor at full speed for one full minute minimum. It shouldn't be a car battery because it would be too dangerous. It would make for some interesting YouTube clips, the "Pulse Motor Speed Showdown."
Good luck with the battery charging.
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The whine is most likely because the transistor-coil circuit makes it susceptible to spontaneous oscillation, just like any other amplifier. Stray capacitance in the circuit and the coil form an LC oscillator at their natural resonant frequency, powered by the transistor. That's why I suggested the cap between the base and ground, to short out the resonant signal going into the base and reducing or eliminating the feedback loop.
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Hey there,
You know that my central theme is that people aren't making their measurements properly. I also discussed how you should try to develop an innate feel for power consumption.
The same thing also applies to rotational speed. You should try to develop a feel for RPMs. I can tell you just from looking at your clip that the 6-magnet slave rotor is not turning anywhere close to 3000 RPM. It looks like it is turning a few hundred RPM max.
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2nd posting:
I assume that the instructions for the optical tachometer request that you put a single highly reflective spot on the device under test to make it easier for it to make readings. Perhaps a strip of white tape on each rotor would do the trick.
Since the two rotors ock up, I assume that the speed of the 6-mag rotor should be 4/6ths the speed of the 4-mag rotor.
For the whining from the coil, try putting a 0.1 uF ceramic cap between the transistor base and the emitter (ground).
Drevtoobe 3 years ago
right. been working hard. Think the whine is due to variable resistor being just about knackered and the 100ohm resistor too. them fixed I have moved on. As for ur comment above, I believe ur right. My tachometer was giving bad readings despite having proper reflective surface. ur estimates seem good. However, i changed the coupled rotor to 3 magnets and u should have seen the speed!! takes torque, I think there may be potential energy. ATM i continue to condition my batteries and charge others.
Pwordchernoir 3 years ago