Is this the first selfrunning overunity motor w/o batteries ? Mike?s motor

[z_p_e]

Dave,

One other simple solution to the varying Rb "problem", is to replace Q1 with a high gain transistor such as the 2N5210, or even use the MPS8099 (not as good Beta as the 2N5210) as originally from John's schematic.

With a high gain transistor as Q1, you should be able to start off with, and leave in a higher value resistor such as 1k or even 2k or so.

What are you using for transistors right now?

Darren

[z_p_e]

Well,

I spent about 2 hours yesterday looking over snaps from the video and  the stills we have of the motor, trying to trace out the wiring as Peter has done also. It can make you crazy, especially since the video and stills are taken from opposite sides of the motor. 

I concur with most if not all of Peter's findings. I can not see the diode anywhere, so can't confirm its placement.

I'm not saying that what Mike has there is per Peter's last drawing, but it sure appears that way.

I am fairly confident however that the posted waveforms will not match if the circuit is built that way, so each must decide for himself which circuit to use.

Darren

[Peterae]

Hi Darren
Glad you checked out the diagram.you do go a bit blurry eyed after a while.
Glad you find as i have.


Peter

[CTG Labs]

Hi Darren,

I agree that increasing speed lowers the current draw in pulse motors, but I have never really built or played with any specifically before so it never occurred to me until I started playing, but logical when you think about it!

I just used TIP31a and the PNP opposite just as its what I had to hand and wanted to get it running.  Now it is running I can start to optimise the circuit.

Your idea for auto adjustment of the base current sounds good!


Dave.

[Peterae]

Hi Dave
Whats the min voltage yours will sustain rotation at.

Peter