Author Topic: pulse motor Working video and info (Read 148425 times)

Nastrand2000 · « **Reply #30 on:** September 01, 2007, 06:08:20 AM »

I will answer this tomorrow...sorry i have to go to bed now. I will redraw the schematic to show you where to recapture the energy.
Jason

tropes · « **Reply #31 on:** September 01, 2007, 04:18:09 PM »

Jason
I have built several pulse motors in the past ( http://www.theowlnest.com/kickbypage.html ) but I have never captured the bemf. I hope to learn from your experience.
Peter

Nastrand2000 · « **Reply #32 on:** September 01, 2007, 09:22:29 PM »

I changed the circuit a little bit (i had a wire going to the wrong side or the transistor). But the picture below should help to answer your question I hope.
Jason

tropes · « **Reply #33 on:** September 02, 2007, 12:53:29 AM »

Quote from: Nastrand2000 on September 01, 2007, 09:22:29 PM

I changed the circuit a little bit (i had a wire going to the wrong side or the transistor). But the picture below should help to answer your question I hope.
Jason

Thanks Jason
I will study it carefully. BTW, are the rotor magnets S or N pole outward or does it matter? What are the specs of the Capacitor and battery? What is the PN of the transistor?
This diagram is one I got from Konehead.

Nastrand2000 · « **Reply #34 on:** September 02, 2007, 01:46:24 AM »

Peter,

My magnets are alternating north south, I'm only using 4 magnets on my current setup. My battery and cap specs change all the time because I'm always switching them around. The caps are anything 2 micro farad to 1 farad, ranging in voltage from 25 to 400 volts. The transistor is a tip3055 (part number 276-2020 from radio shack). But I've found that most npn transistors will work, although each one has its own characteristics.

you can see my motor at http://ymygody.googlepages.com/

Jason

tropes · « **Reply #35 on:** September 02, 2007, 02:29:41 AM »

Jason
Thanks for the info. and photos. I will consider using a pickup coil next to the flywheel on my motor. Does the polarity of the magnet determine the direction of the current?
Nice to see a workbench as tidy as mine!
Peter

Nastrand2000 · « **Reply #36 on:** September 02, 2007, 03:09:39 AM »

Peter,
I guess I'm not fully understanding the question. The polarity of the pickup coil, driving coil, or back emf?
Jason

tropes · « **Reply #37 on:** September 02, 2007, 04:06:35 AM »

Quote from: Nastrand2000 on September 02, 2007, 03:09:39 AM

Peter,
I guess I'm not fully understanding the question. The polarity of the pickup coil, driving coil, or back emf?
Jason

The polarity of the driving coil must change to match the polarity of the rotor magnets if the magnets are N-S-N-S.

Nastrand2000 · « **Reply #38 on:** September 02, 2007, 04:39:09 AM »

Peter,
The coil only fires twice per revolution. The diode on the pickup coil only lets current flow one way through the transistor, which allows the current to flow through the driving coil. Either attraction or repulsion will work, however I find repulsion to work better. While the coil is pushing the north magnet away, its is attracting the south magnet. I find that a bifilar coil (single coil wrapped with two wires) works well with this design. Also, since I don't use ferromagnetic cores, I don't have to fasten my coils if I'm using small amounts of wattage (like less the 1/2 watt). This allows me to move the coil around without fear of hitting the magnets.

tropes · « **Reply #39 on:** September 02, 2007, 04:57:21 AM »

Quote from: Nastrand2000 on September 02, 2007, 04:39:09 AM

Peter,
The coil only fires twice per revolution. The diode on the pickup coil only lets current flow one way through the transistor, which allows the current to flow through the driving coil. Either attraction or repulsion will work, however I find repulsion to work better. While the coil is pushing the north magnet away, its is attracting the south magnet. I find that a bifilar coil (single coil wrapped with two wires) works well with this design. Also, since I don't use ferromagnetic cores, I don't have to fasten my coils if I'm using small amounts of wattage (like less the 1/2 watt). This allows me to move the coil around without fear of hitting the magnets.

Okay Jason. That clears things up. The driving coil fires twice /revolution with four magnets on the rotor. The pick-up coil is positioned to determine when this firing takes place.
Yes, I did wind a bifilar coil for my first pulse motor. Since then, Ian Coke-Richards http://www.mintakafulcrum.net/ has been winding them for me.
Peter

Nastrand2000 · « **Reply #40 on:** September 03, 2007, 01:28:20 AM »

Peter,
The one thing I didn't show in the picture was the resistors on the pickup coil. In my setup I'm using a 1.5k ohm in series with a 100 watt light dimmer. This way I can adjust the current thats available to the driving coil. The less resistance, the more back emf. Because there is a stronger field created in the coil that is allowed to collapse after the magnet passes. I hope this helps, good luck.
Jason

Nastrand2000 · « **Reply #41 on:** September 03, 2007, 01:40:21 AM »

I just noticed that the way I drew the circuit, I created a direct short through the driving coil and the battery. Sorry. Anyways I fixed the drawing and posted it below.
Jason

Ren · « **Reply #42 on:** September 03, 2007, 03:52:05 AM »

Hi guys,

I have recently begun work on a pulse motor of my own and I am using 4 bifilar coils to pulse a wheel with 5 magnets. I am triggering a single wind on each coil with a microswitch and seconday windings are fed back through 4 bridges hooked up in series. Picture here is before last coil was added. http://www.overunity.com/index.php/topic,3185.0/topicseen.html

I can get fluctuating voltages at full speed from 15-19 volts coming through the bridges, can I use these spikes to fill a capacitor and dump it back onto a battery?

Nastrand2000 · « **Reply #43 on:** September 03, 2007, 04:11:04 AM »

@Ren,
The short answer is yes you can dump this voltage into a cap. Let me ask a few questions first.
Is the voltage you are reading ac or dc?
Are you using a digital meter or an analog meter?
And what voltage are you using to run your motor?
Most likely what is happening from your explanation is a transformer effect.
Jason

Ren · « **Reply #44 on:** September 03, 2007, 08:32:51 AM »

Feedback trough second coils is sopradic jumping between 15 and 19 volts on digital multi meter. All coils are fed through a bridge rectifier and all bridges are connected in series, so I am assuming dc. Read on 20v setting on a cheap multimeter.

voltage to first wind (voltage that drives the motor) is from 12 volt wall outlet. Possible that this is spiking at all? It reads a steady 13.3 volts when switch is held closed.

I need to get some better equipment. Its electricity alright, I tasted some

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Author Topic: pulse motor Working video and info (Read 148425 times)

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