Hi Berto, You have built a interesting setup. good to see it working indeed. Would like to make a few comments. You include a schematic with two transistors and there must be a drawing error: you have probably flipped the collector-emitter pins of the pnp-npn drawing symbols. I say this because the left hand side transistor is shown as a pnp type while its collector is connected directly to battery positive and the same mistake for the right hand transistor, shown as an npn type: its collector is connected directly to battery negative. I wonder what kind of further input current reductions do you wish to achieve and how. You use a diode in parallel with the pulse coil, so you utilize the collapsing field energy at each switch-off moments and this is good. You may have checked how the input current changes when you gently start slowing down the spinning rotor by your fingers. Obviously the input current increases when rotor senses such mechanical loads. I mention this because the use of some pick up coils around the rotor as generator coils may also help reducing overall input power consumption, possibly at a cost of some reduction in the rotor RPM. Gyula
@Bertoaus
6 жыл бұрын
Hallo Gyula, Thanks for your reaction. The circuit is from Larskro. I do not know who the actual designer of the circuit is. I made the same observation about the npn and pnp pin connection. But the circuit works, crazy enough. Why? The rotor magnet induces a pulse (voltage) in the aircoil. This opens the pnp transistor and this opens also the npn. The npn can only activate the coil when current flows from minus to plus. This happens when the coilside is more negative than the minus, due to the magnetic induction in the coil. That is my interpretation, for now. In the next part of the Donut motor saga I want to show, with the help of the oscilloscope, what exactly happens in that circuit. You can see; I placed a LED over the coil and below the rotor a 10Kohm coil to reclaim some energy from the rotor magnets. That will indeed lower the rpm. To reduce the input current I want to have control over the pulse duration. Not one of the very low current pulse motors, here at KZitem, has that. They show not convincing measurements. I want to change that. This video is just an introduction to the machine. The quest continues. Berto
@gyulasun
6 жыл бұрын
Hi Berto, Okay, thanks for the answers. I think first it was DadHav who showed using the pnp-npn transistor combination for pulse motors but he did not use the transistors with flipped C and E. I went to watch both Larskro and Lidmotor's videos on this 'micro amp' setups. I found that Lidmotor has not used the transistors with flipped C and E either but Larskro did. However, I found another youtuber, Simplefix2969 who did refer to using his npn transistor (MPSA18) in 'reverse' mode i.e. he flipped the collector and the emitter pins because he found the current draw went even lower by that. However, he used his pnp transistor with the normal pin connections. See his video: kzitem.info/news/bejne/1HmQqaxmsIF4g6A (notice he made a typo in his schematic in the video what he corrected only in the comment section right under his video) So this may explain the usage of the 'reverse' mode operation for the transistors. Thanks, Gyula
@gristlevonraben
6 жыл бұрын
awesome
@MisterSlickable
5 жыл бұрын
Hello Berto! Thanks for the cool video. I would like to recreate the setup and run into problems finding the right solenoid. You write it should have 14 kOhm impedance. This alone does not help me too much. Could you please give more parameters?
@scotty7129
5 жыл бұрын
you could run that on a crystal radio circuit..... ;-)
@Ozzy3333333
6 жыл бұрын
Interesting, Can you give more detail on the scope screen capture. Did you use a current probe or? What was the current vertical scale?
@Bertoaus
6 жыл бұрын
The scope screen shows the voltage pulse over the BC547c. The motor current I measured analog and digital and the outcome is average. Pulsetime to pause time is 40msec to 150msec. At this moment I supply an average current of 30uA. The calculated current is about 6.316uA. The battery life is about 4 years, 90 days and 8 hours.
@stelic9515
6 жыл бұрын
Hii Thanks for video and good explanations. Your engine are great I want to built a vertical pulse motor that will work non stop years and don t know what bearing to use ( I don t have sophire glass and can t buy) . I have a mendocino motor with point bearing made by a steel ball from a ball bearing . After a few weeks of running on the glass and on the steel ball start to have wear signs and the friction increased .( I believed will last years but no!!! ) I can see you use the same type of bearing. Did you have wear problems?? My mendocino shaft is horizontal and move from side to side a little and perhaps that s why the wear problem I think perhaps the solution for the vertical pulse motor is the point bearing made by steel ball on glass surface submerged in oil will wear much much less if the oil will enter between steel ball and glass like the lubrication to a car engine. Oil will increase drag but need to make some compromises.. Or to use a real bearing . A miniature type . Have you a better idea???
@Bertoaus
6 жыл бұрын
Hello Steli, thanks for your reaction. I understand your point. Pulse motors can run for a long time but the wear of bearings and power source people don't take in account. Pulse motor makers here at YT talk about running for 55 years and more but that is pure speculation. At this moment I am, just as you, making and testing long running (20 year!) pulse motors. That means; making many models with slight changes in the setup of the bearings, the electronics and the power source. Your idea to use a steel ball on glass with lubrication is good but needs testing on drag. I think this goes better with a horizontal shaft because of the weight of the rotor. A small ball and as less as possible pull of the magnets of the magnet bearing and the right oil will do the job. Mini bearings give more drag; without grease they run better.
@stelic9515
6 жыл бұрын
Hello and thanks for reply I decided to use the vertical rotor and as a bearing use the magnetic levitation that is provided by 2 ring magnets that repeal each other The only friction is in to small 2 brass bushes that spin on the vertical 1mm steel shaft that is necessary for the rotor to be stable. The friction is better that miniature bearings but still is on brass bushes. The good thing is the weight of the rotor is not so important because it stay on levitation. The bushes is used only for stability . So the result is much better than with miniature ball bearings but need to refine more . for moment the motor work at 1v and eat 150 ua.
@stelic9515
6 жыл бұрын
I chosen vertical shaft because of the balance problem in horizontal shaft. I built a Mendocino motor and was almost imposibile to balance it right .
@JimEdmiston
6 жыл бұрын
Great video. Your design looks very similar to that of John Bedini except his ran much longer than your projected runtime. What this design amounts to is not much more than a timing circuit, as it would struggle to create torque at the shaft.
@Bertoaus
6 жыл бұрын
Globe Motors or Sphere Motors were originally built in the 1880s by John W. Keely in Philadelphia. They were made as a power source to drive industry. In those days there was only wind, water, steam and animal power. Torque at the shaft is not my first goal for this project.
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