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Author Topic: Tinman's coil shorting circuit  (Read 71195 times)

synchro1

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Re: Tinman's coil shorting circuit
« Reply #90 on: November 15, 2015, 04:17:23 PM »
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

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Re: Tinman's coil shorting circuit
« Reply #91 on: November 16, 2015, 10:30:42 AM »
Yes, it makes the same sound as your V3 RT when you activate the switch to power the load.



Thanks

Luc

Quote
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

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Re: Tinman's coil shorting circuit
« Reply #92 on: November 22, 2015, 12:16:19 AM »
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

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Re: Tinman's coil shorting circuit
« Reply #93 on: November 22, 2015, 01:25:31 AM »
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

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Re: Tinman's coil shorting circuit
« Reply #94 on: November 22, 2015, 02:46:58 AM »
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.

penno64

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Re: Tinman's coil shorting circuit
« Reply #95 on: January 25, 2016, 12:28:41 PM »
Bump

Australia Day tomorrow.

Any additional tips?

Regards, Penno

penno64

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Re: Tinman's coil shorting circuit
« Reply #96 on: March 22, 2016, 10:57:11 AM »
Hi Brad,

With the RTv3 how does one implement a decrease in the magnetic field strength as that field approaches the stator(generating)coil,
and an increase in the magnetic field strength as the field is leaving the stator coil ?

Is it that one stator field is solely used for timing to drive the switch (fet) that connects the other stator field on or just after TDC ?

Any tips greatly appreciated.

Regards, Penno

tinman

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Re: Tinman's coil shorting circuit
« Reply #97 on: March 23, 2016, 04:11:12 PM »
Hi Brad,

With the RTv3 how does one implement a decrease in the magnetic field strength as that field approaches the stator(generating)coil,
and an increase in the magnetic field strength as the field is leaving the stator coil ?

Is it that one stator field is solely used for timing to drive the switch (fet) that connects the other stator field on or just after TDC ?

Any tips greatly appreciated.

Regards, Penno

You neutralize the permanent magnets field until the rotor segment just passes TDC(in regards to the PM),and you then disconnect the current flowing to the coil around the PM that neutralizes that PMs field,and short the stator coil. This shorted coil forms an apposing field to that of the rotors field by way of transformer induction. This apposing field is then the same field as that of the PMs field,and so the rotors field now has an extremely strong apposing field to push against.
You can then capture the energy from the stator field when the short is opened,and the cycle is repeated at every armature/brush contact segment. The timing is controlled by the AC current produced in the second stator coil,which is also your main transformer coil.


Brad

penno64

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Re: Tinman's coil shorting circuit
« Reply #98 on: March 23, 2016, 07:41:54 PM »
Thankyou.

Have a wonderful Easter.

Regards, Penno