A Self-Charging Adams Motor

[Tink]

I can't see the gate of M1 steering M1 at all or am I missing something?

[gyulasun]

I can't see the gate of M1 steering M1 at all or am I missing something?

Yes, it should be modified I think. The collector of Q1 is to be connected directly to the gate of M1, (the gate of M1 should not be connected to anywhere else but the collector) and there should be no connection from the collector to M1's any other two legs (that presently seen horizontal wire from collector to M1 should be cut). This way the voltage drop across the collector resistor R1 will directly control the gate.

By the way M1 is a P-channel device I wonder?

Gyula

[lanenal]

Yes, it should be modified I think. The collector of Q1 is to be connected directly to the gate of M1, (the gate of M1 should not be connected to anywhere else but the collector) and there should be no connection from the collector to M1's any other two legs (that presently seen horizontal wire from collector to M1 should be cut). This way the voltage drop across the collector resistor R1 will directly control the gate.

By the way M1 is a P-channel device I wonder?

Yes, I think you are right: both M1 and M2 should be P-channel devices. Note that R1 and R2 are supposed to be of very high resistance compared to L1, their main purpose is to raise enough voltage when Q1 switches to the ON state (When Q1 is in the OFF state, the gate voltage should be close to zero, yes?), for the gates of M1 and M2.

lanenal

[gyulasun]

hi,

Well, I do not think M2 should be p channel...   it should be n channel and M1 can be p channel, this is how I understand such switches in your configuration.  The best would be for you to test this circuit if you could afford the time, sorry, I cannot now.
And also please modify the schematics on connecting M1's gate to the collector instead of the positive wire (the question from Tink).

Let's try discussing this circuit, though mostly you have written it correctly in the text under your schematics. Q1, M1 and M2 are off state and the approaching magnet induces voltage / current in L1-L2,  Q1 switches on and so do M1 and M2,  current is able to flow from the battery through L1, its flux kicks the passing magnet away from L1-L2.  Let me stop here for a moment: transistor Q1 will be switched off anyway around the time the magnet is kicked out because its base-emitter cannot get any positive bias from anywhere else,  but it is still good if the base-emitter gets an extra switch off bias from L1's flyback pulse and this induces a counter current in L2, if so,  this helps Q1 quickly reach and remain off state until the next magnet approaches again.

Regarding the values of R1 and R2, if you choose both to be say 1kOhm and let the collector current of Q1 to be 5mA, then the voltage drop on both is 5V and this 5V usually is enough to open the power MOSFETs (their usual threshold voltage is between 3-4-5V and there are special types with even lower switch-on thresholds, both in p and n channel polarities).

So in case M1 is p channel type, its source will be tied to the battery positive wire, its drain will go to L1-D4 common point and its gate directly goes to Q1 collector.  And let M2  an n channel type, its drain goes to L1-D3 common point, its source goes to battery negative wire and its gate goes to R2 as shown.  By using the two differing polarity types for M1, M2, their so called body diodes (that internally exist between the drain-source electrodes of each) will block each other should any unwanted induced current start flowing through them. 

Now the question remains: will this be overunity? Well if you think the original circuit has got at least 80-90% efficiency without your regaining the flyback pulse energy, then the possibility is open for ou with your circuit at least to keep the battery in a charged up state, to keep it at a level where its terminal voltage is kept more or less constant for a long time. This would already show sure ou...
Do not forget the rotating wheel with the magnets also produces work and somehow it ought to be utilized in the overall efficiency quest.

rgds,  Gyula

[cousinles]

This guy clames to have modded an adams motor and it ran for 25 hours on a D cell battery.

http://www.youtube.com/watch?v=WDcl3enEqqk