On 06 Jun 2003 07:15:02 -0400 ed tharp <[EMAIL PROTECTED]> wrote: > PWM is a method (as well as a proprietary trademark of Allis Chalmers, > now Fiat-Allis as PWM was not sold to Komatsu or Kalmar when the > Forklift divisions were split away) but most folks, for some long time, > considerd that since the most cost effective manufacturing method was a > monolithic SCR for controlling power flow, that pulse width modulation > was not really practical as opposed to controlling "percent on" time. > true PWM requires cascading transistors, and the tech has only gotten > good in the last 5 or 6 years in manufacturing small and strong enough > transistors (Field Effect Transistors) to really make PWM work. one of > the real tricks to making pwm work is to use regenitive braking to > control the powerbraking as a means of sinking heat energy to the motive > battery.
Ya, and they look GREAT in red. Miark
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