Quote:
Originally Posted by kokerich
Hi there!
Had a little time this weekend and decided to play around with the electromotor model that I found in one highschool cellar. 
I converted it to an attraction motor removing the coils from the rotor, and adding a photosensor from an old computer mouse. I didn't want to wound any coils the stator had two already, I just used those.
I just wanted to see how the motor works. It started working at first start with no trouble. Here is what I founded by playing with it a little.
It works better when the elecltromagnets in oposing poles like on the picture.
I did't have a tachometer but it's clear that the rpm is higher and the tourque is larger. With the windings in paraler the current is bigger so it works faster. It drew a 100mA with the diode disconected, when shorted it draws a lot more, and when I added a resistor of about 18ohms it drew about 140mA and worked much quieter. 
Also in every configuration there is a very little back emf.
The trouble is when I connected the secondary battery for charging. I connected one old car battery, it had a 10V so it wasn't completly dead, and the motor stalled. It seems it was too much load for it. 
I was wondering if it is possible to charge a capacitor and then to quick discharge it every 2 seconds or so on the secondary battery like on the bedini's systems? Will it form a negative resistor?
Anyways I'm glad that the motor works, so I'm going to build a new one that should work better!  |
Dear Kokerich,
Nice set up. Thanks for verifying everything again, for those new to the forum. The question is, why did your motor stall when you connected the battery to the output coil? If your schematic diagram is correct, there may be a few things going on here. The nomenclature of your schematic shows the two coils connected in parallel, but also shows dots at opposite ends of the coils. These dots usually denote "same sense" to a set of transformer windings, but you have them wired together against this. So, first of all, I am not sure what this means.
Normally, in the circuits used in this forum, parallel windings like this are NOT used because they tend to allow the collapsing fields to discharge INTO EACH OTHER rather than into the output recovery circuit. This can cause the magnetic fields to collapse much more slowly so that they are not completely gone by the time the iron is due to leave the stator. This is what might be "stalling" your motor. Connected properly, your output battery CAN NOT slow the motor down. If you run each winding with its own transistor and then collect the collapsing field from each coil with its own diode, the motor should run just fine while charging your battery.
Keep up the great work.
Peter