[ausev] does anyone have experience with A/C induction motors and Lithium...

[Charlesvsi at aol.com]

Only generic information, the technology used in electric drill speed  
control is all transistor controlled and by using phase shift data, can maintain  
speed under changing load. It is either ac or phase shift chopped dc which turns 
 out similar infunction.The new 9 to 21 volt battery packs are Lithium ion 
and  are amazing, don't lose charge over time, work great and recharge time is 
very  short now. 
 
In 1965 I worked at Sperry Phoenix on an autopilot system with the  
electronics for yaw control by a dc motor using phase shift, for B-52 and Boeing  727 
aircraft autopilots. Using chopped dc, transistor switching time was  
nanoseconds, no heat loss, and feedback (Back EMF phase shift) from motor  current 
allowed us to drive the motor whereever we needed at any temperature or  load.
 
My prejudice says that ac induction motors with no brushes, no heat loss  
from control circuits,  feedback for auto correction of control setpoint,  and 
great battery current flow and temperature monitoring, has to be the  way of the 
future. 
 
Our '04 Honda Civic Hybrid uses this technology and in cruise control we  
stay at 71.5 mph up and down mountains passing trucks, ford explorers, everybody  
else while we are going over the hills with 43 mpg. average. Toyota Prius has 
 different implementation of electric motor usage but does same thing overall 
 with 45 mpg.
 
Good luck finding open market products for ac control, The software and  
sensors are very sophisticated but great. 
PS, I retired after 38 years in the process control instrumentation  
industry. There is very sophisticated control software in use in chemical plants  for 
real-time control like we need for cars. It will be available one of these  
days in all cars.
C. 
e-mail: charlesvsi at aol.com
Phone: 512-331-9630



In a message dated 5/12/2008 11:44:56 A.M. Central Daylight Time,  
k.douglass at earthlink.net writes:

 
Does anyone have experience with  A/C induction motors and Lithium battery 
packs? 
Thanks, 
Kevin  Douglass





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