Electric Motor Secrets

[cyberXena]

Questions to anyone about the Lindemann circuit-

sorry about the position of the post here but as newbie I'm just getting "Sea Legs" here. I built a rotary attraction motor from an old vacuum motor with the circuit in the Lindemann video (I have the DVD ) - I had some questions about the circuit specifics. I know these posts are quite old but perhaps someone still reads these and may know the answers or can point to the info:

1. Why is the transistor in the circuit (on the october video) so large/
it is a MJL21194 is huge - 200 VDC@16 Amps! why not just use a Darlington like TIP120 or something.. ?

2. Does anyone have a circuit enhancement to accomodate using a hall effect ic instead of the reed switch? I will upload my proposal as soon as I can find the right place to do it.

Here are some pictures and a video link to what I have done...

DSCF1562.JPG

DSCF1565.JPG

YouTube - DSCF1566

[tjnlsn255]

Hi CyberXena,

I have just started working with Peter's circuit also....

On page 7 of this link to John Bedini's web site there is a picture of his sequential bipolar circuit and this one uses a Hall sensor for the trigger.....

I think that gives up an idea of how to do it......

Hope that helps.....

MOTOR DIAGRAMS AND LAB NOTES

Also, I am planning to try the TIP120 transistor myself on a Newman motor with Peter's circuit.... I will let you know what happens......LOL

I looked for an Attraction Motor thread but could not find one if someone reads this and has a link to Peter's Attraction Motor thread please post the link for us....

Have a most excellent day.....

Tj

[Jetijs]

I looked for an Attraction Motor thread but could not find one if someone reads this and has a link to Peter's Attraction Motor thread please post the link for us....

Have a most excellent day.....

Tj

This is the very same thread, only the info that you are looking for is probably a few tens of pages before this one.

[Eric]

sorry about the position of the post here but as newbie I'm just getting "Sea Legs" here. I built a rotary attraction motor from an old vacuum motor with the circuit in the Lindemann video (I have the DVD ) - I had some questions about the circuit specifics. I know these posts are quite old but perhaps someone still reads these and may know the answers or can point to the info:

1. Why is the transistor in the circuit (on the october video) so large/
it is a MJL21194 is huge - 200 VDC@16 Amps! why not just use a Darlington like TIP120 or something.. ?

2. Does anyone have a circuit enhancement to accomodate using a hall effect ic instead of the reed switch? I will upload my proposal as soon as I can find the right place to do it.

Here are some pictures and a video link to what I have done...

[ATTACH]2785[/ATTACH]

[ATTACH]2786[/ATTACH]

YouTube - DSCF1566

welcome!

to answer your question on the MJL21194 from ON semiconductor, if i remember correctly, i was told quite awhile ago that this one is an extremely reliable bipolar transistor for the type of circuit we are building, and is/was used a lot by bedini in a lot of his circuits as well. the reason we need it is for the brief moment the tranny is on it needs to dump as much amps as V=IR will allow it to. and when you turn the switch off the kickback can easily fill a 220v photo flash cap and if you dont have something connected for the kickback to dump into it will try to short through the tranny and if the tranny is not beafy it can be destroyed (also a 600v NE2 neon light bulb connected from collector to emmiter can help save your tranny). i purchased 25 to start with because of the available discount and the assumption that i still might ruin some as i learn.

as to the darlington, thats a very different circuit used for power gain (as in amplifiers) its not what we are looking for. the circuit in its simplest form(as shown in peters video) is the best place to start. the trick is in using the resistor bridge on the base. when the power is cut off and the polarity switches the bridge allows the gate/base to shut off "hard" and clean this is needed in order to allow the collapsing field only one other alternative, to be collected in a charge batt.

hope that helps!
Eric

[cyberXena]

more on the transistor and Hall....

Thanks for the info...
I thought there was more to the 21194..than it was just lying around. So to be sure you are saying the kick back can spike the 21194 to its top load.

I first got the motor running and it coged but after i put the 1000uF on the output it smoothed down and purrs now.. As for the hall interface though..
Here is a circuit mod I got from Allegro Systems (a hall vendor) and i tried to figure an interface but with your comments on the voltage divider to the base of the 21194 I'm wondering if this will mess things up there Comments? Ideas..

ld5.JPG

-CX

[Eric]

oh yu can try that circuit but i imagine it will run quite warm and not very good.
yes the resistor bridge is needed to give you very quick clean pulses.
as to the tranny it depends on the size of the motor and now much amps it will want. so far, the only way i ruined some of those particular trannys is by hooking them up wrong but when used with the correct circuit they have never heated up on me.

because i am taking a semi mechanical path i use glass tube reed switches, i have yet to learn much about halls but i imagine that a hall is an npn device so you would need to use a PNP tranny to let it "talk" to another NPN there is more info in previous posts.

[LowTechIsCool]

Circuit design

Hi,

In Jetijs' current setup, he uses a bifilar coil. One of the coils has a diode. The purpose of this is to have two different paths for the current to travel depending on whether you want charging or recovery

Would it be possible to use only one coil and add another diode? I will post a picture of this later today, but it seems to me that two paths could be created and only use one coil.

-Chris Corkum

[tjnlsn255]

Bedini Seq Bipolar Circuit with Hall trigger...

Here is a Bedini Seq Bipolar circuit with a Hall trigger for an example.....

This schematic is from a page on John's web site.....

Tj

[cyberXena]

more hall tricks ....

I thought this might be hot! This could blow up! But it is an app note from Allegro who makes the halls. I strated using reed switches in glass tubes but they were slow and they seemed to have a latency... I found one with a quick reponse that is potted and encased. But a Hall has the best response.
Here is another try at a solution with a solid State relay.

l4.JPG

Comments? Where is the info on this on this board?

-CX

[Armagdn03]

Hi,

In Jetijs' current setup, he uses a bifilar coil. One of the coils has a diode. The purpose of this is to have two different paths for the current to travel depending on whether you want charging or recovery

Would it be possible to use only one coil and add another diode? I will post a picture of this later today, but it seems to me that two paths could be created and only use one coil.

-Chris Corkum

Its very Possible, what you are refering to would be similar to a boost converter.

[LowTechIsCool]

motor pics

Hi,

I know I always like seeing new motor pics posted to the forum, so here are some of mine. I hope the link works.

[LowTechIsCool]

Singel coil recovery



I posted a picture of the circuit I am thinking of. Would this work?

[Aaron]

posting pics

Chris,

I'm not sure why your pics are showing.

When posting a message, make sure to use this icon:

It will then ask for the URL - you can use the one of the pic at wherever you have it posted.

[tjnlsn255]

You have to use the paper clip icon if you want to attach a picture to your message directly from your computer......

just a thought.......

Tj

[LowTechIsCool]

second attempt