View Single Post
Old 01-31-2009, 01:54 AM   #15 (permalink)
Clev
Wannabe greenie
 
Join Date: Aug 2008
Location: Yorba Linda, CA
Posts: 1,098

The Clunker (retired) - '90 Honda Accord EX sedan
Team Honda
90 day: 29.49 mpg (US)

Mountain Goat - '96 Ford Ranger XLT 4x4 SuperCab
90 day: 18 mpg (US)

Zippy - '10 Kymco Agility 125
90 day: 65.03 mpg (US)
Thanks: 5
Thanked 53 Times in 40 Posts
Quote:
Originally Posted by MazdaMatt View Post
Ben,

You say higher voltage makes for the same work at lower current. This is true, P=VA... but isn't the force generated by an electric motor ONLY proportional to current? If i recall correctly from electromagnetics class (way back), F=cAT (c is a constant, Amps, Turns).... (I'm really sketchy on the electromagnetics details).

Help
That's where the controller comes in. This is not technically quite correct, but by controlling the duty cycle, the controller essentially outputs high current at very low voltage at low RPMs, and outputs lower current at higher voltage at high RPMs, while drawing the same current/voltage at the battery.
__________________

  Reply With Quote