Controller circuit for Hilden Brandt motor needed..

[dingbat]

Insert Quote
Hello Nali2001,

Well I think I have the mesurements you want.

I am using #15 Wire single coted.
The resistence I mesured with a FLUKE T5-600 tester it was 6 oems.
The coil core is 2.600" X 2.250" X 6.00 inches long, silicon steel.
The perminent magnets are N48 they mesure 2" X 2" x 6".
There are 890 turns of wire on each coil.

I am running the motor with 150 VDC at .600 amps.
The motor runs at around 2000 rpm.

Have you got any way to predict the amount of voltage these coils could produce using N48 magnets, at 2000 rpm each coil turns ON/OFF twice per rev.

I put a second set of points on one coil so the voltage would not short out, I then hooked it to a bridge rectifier and hooked it to a cap.   I read with the FLUKE meter around 350 VDC.  I diden't have a way to check current but it lite a 75 watt light bulb up as bright as when you pluge it into the wall.

Thanks for any help you can give.

Later,,,,,,,JackH

In my opinion, the voltage coming from the coils could easily be thousands of volts, depending upon exactly how the switching is done.  The voltage generated by a coil is a function of how fast the coil is discharged.  If the coil is disconnected very abruptly, as with points, only the resistance of the wire limits the discharge rate.  It is not uncommon for coils to produce tens of thousands of volts when rapidly discharged. (hence the arcing at the points)

[JackH]

Later,,,,,,JackH

[Schpankme]

Oh by the way,  Ohio State University is coming down to look at the motor tomorrow at 2:00.

Hello JackH,

If you could please, tell us how was your meeting with OSU ?

- Schpankme

[Honk]

I didn't have a chance to adjust the voltage yet, it was set at what you set it at.

It was set to the lowest possible output at 62V

Well it seemed to be building up speed as fast as the points do, it was really looking good.

That is good news. Then I don't have to worry about the Amps output level.

Honk I just do not think that this voltage is BEMF, I really think that this thing is generating a large amount of voltage and current when
the coils collapses and the N48 magnets flux lines need to cut the copper wires on the coil to get back in the coil core.
Remember there is 890 turns of #15 wire the flux lines need to cut before they can get back to the coil core.

When speaking about BEMF from your motor I meant of course the extra added BEMF force from the N48 magnets.
Don't worry. I know how your motor is working. When I get the controller back I will investigate the cause of the breakdown.

[JackH]

Thanks,,,,,JackH