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!
