HOW IT WORKS.

 

IMPORTANT: I use a very low current (.0015ma) high voltage supply (15,000V).
Terms: Leyden Jars will be referred to as caps
STEP 1:
The 2 red caps are charged with positive voltage. The 2 dark gray caps are at earth potential or ground. The 2 rotor aluminum strips accept the positive charge by a brush, or a small thin piece of aluminum going from the red caps to the rotor. The same happens on the negative side or black caps. 

My motor used 8 field caps. The drawing if for simplicity. 
 

STEP 2:
Because unlike charges attract, the red tabs on the rotor will approach the negative cap and the black tabs on the rotor will approach the positive or red caps. This causes the rotor to turn, in this case, counter clockwise.
STEP 3:
The magnetism between the rotor tabs and the field caps keep the rotor turning. The field cap will always be the opposite polarity of the approaching rotor tab. Every time a rotor tab passes the field cap, it's polarity changes, keeping the rotor turning. 
 
 
 
 
STEP 4: 
When the charged tab (red) gets close enough to the black cap, the foil will touch the tab and the tab will become negative and therefore continue to approach the positive (red) cap. This completes the cycle. 

You can add as many caps as you have room for. For every additional PAIR of caps, you increase the power greatly without greatly increasing the load on the static generator. The closer you put the tabs, without arcing, and more field caps you have, the more power you will generate. 
 

POP bottle motor.
CREDITS: I got the idea from Bill Beaty's WEIRD SCIENCE.