When we get finished with the "latching relay" discussion could we look at  
electric propulsion? I would love to hear about the pros and cons from you guys 
 that know electricity. AC motors, DC motors, permanent magnet motors,  
controllers, new battery technology (Lithium titanate nano). What does 
"traction  
motor" mean? Does a larger diameter motor had more torque than a skinny motor,  
other things equal? etc. There seems to be brushless AC and DC motors. How do 
 they do that? Does a controller control DC current or AC frequency or what? 
I  need educating.
 
Ed Schwerin



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