View Single Post
  #13   Spotlight this post!  
Unread 11-11-2005, 11:44
Unsung FIRST Hero
Matt Leese Matt Leese is offline
Been-In-FIRST-Too-Long
FRC #1438 (The Aztechs)
Team Role: Engineer
 
Join Date: May 2001
Rookie Year: 1998
Location: Long Beach, CA
Posts: 937
Matt Leese has a reputation beyond reputeMatt Leese has a reputation beyond reputeMatt Leese has a reputation beyond reputeMatt Leese has a reputation beyond reputeMatt Leese has a reputation beyond reputeMatt Leese has a reputation beyond reputeMatt Leese has a reputation beyond reputeMatt Leese has a reputation beyond reputeMatt Leese has a reputation beyond reputeMatt Leese has a reputation beyond reputeMatt Leese has a reputation beyond repute
Send a message via AIM to Matt Leese
Re: Nintendo Style Speed Booster

Quote:
Originally Posted by Alan Anderson
The Victor speed controllers do use pulse width modulation of the power to the motor. The H-switch inside them is a digital device, either completely off or completely on in one direction or the other. The average voltage to the motors is controlled in approximately 1% steps, but the peak is always full battery voltage.
You're right about the PWM control although I'd say the H-bridge is also an analog device but that's beside the point. I really need to think through before I post.

While peak-voltage is still the same, the voltage changes over time. What that means is that the power is changing over time. But it's happening fast enough that it's really not noticable. Instead, you'd be looking at the average voltage for power calculations, not peak power.

Matt