Tinman's coil shorting circuit

[synchro1]

Hi synchro1

In my shorting video

A Hall sensor triggers a MOSFET transistor to activate the driving coil in attraction mode to the rotor. The stack of magnets behind the driving coil is in opposition to the rotor.
When the driving transistor shuts off, the magnetic field from this stack pushes the rotor away from the TDC. When there is no power applied the rotor is affected by cogging only a little as the stack of magnets is pushing away while the iron/magnetite cores of the generator coils pull to the TDC. The rotor consists of 6 neodymium permanent magnets (N50), of which all the poles are oriented with their NNNNNN outwards.


Two generator coils that are connected in parallel are being shorted constantly many times per cycle using two MOSFET transistors connected source to source with bypassing diodes. This pair is being driven from a small variable frequency/pulse width square wave signal generator/MOSFET driver.
Two neon bulbs are connected across the generator coil pair being shorted and the meter reads rectified pulse DC (no cap).


There are moments when the neons put out quite a light show of purple flashes there and that is where the magic happens, at TDC.

@kEhYo77,

Thank you very very much. Everything's crystal clear now: The meter reads rectified D.C. pulse (no cap) from the pair of shorted generator coils with two neon bulbs connected across them!

[tinman]

Yes, it makes the same sound as your V3 RT when you activate the switch to power the load.



Thanks

Luc

Could you point out where I could get a blueprint of his design

I suspect that you will have access to them at another place shortly

[citfta]

For those of you that are looking for a small motor to play around with I found these.  They are pretty small but the price is right.  You'll pay more for the shipping than for the motor or motors if you order more than one.  I ordered 3 just because they looked like they would be easy to modify and rewire.

http://www.surpluscenter.com/Electrical/AC-Motors/Special-Purpose-AC-Motors/24-120-VAC-15000-RPM-MOTOR-10-1062.axd

[Jimboot]

For those of you that are looking for a small motor to play around with I found these.  They are pretty small but the price is right.  You'll pay more for the shipping than for the motor or motors if you order more than one.  I ordered 3 just because they looked like they would be easy to modify and rewire.

http://www.surpluscenter.com/Electrical/AC-Motors/Special-Purpose-AC-Motors/24-120-VAC-15000-RPM-MOTOR-10-1062.axd

Good find, unfortunately if I want 5 it will cost $50 to deliver to AU. Cheap as heck for the motors though.

[Reiyuki]

Good find, unfortunately if I want 5 it will cost $50 to deliver to AU. Cheap as heck for the motors though.

Thrift shops/pawn shops usually have a few old vacuum cleaners laying around for cheap (5-10 bucks?).  Usually have some great AC motors on them with good torque and an unloaded speed past 10k rpm.