Thread: Top Speed
View Single Post
  #11   Spotlight this post!  
Unread 02-12-2003, 22:46
The Lucas's Avatar
The Lucas The Lucas is offline
CaMOElot, it is a silly place
AKA: My First Name is really "The" (or Brian)
FRC #0365 (The Miracle Workerz); FRC#1495 (AGR); FRC#4342 (Demon)
Team Role: Mentor
 
Join Date: Mar 2002
Rookie Year: 2001
Location: Dela-Where?
Posts: 1,564
The Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond repute
Send a message via AIM to The Lucas
Re: Top Speed

I'll tell you what I tell everyone who attempts to build a really fast drive. Watch your current draw! When motors stall it will wreak havoc on the electrical system. The battery will max around 300-400 Amps and the voltage will drop horribly. I experienced this firsthand with 2002's MOEhawk which had direct driven bosch motors in high gear (probaly ran about 20 feet per sec but accelleratin was slow). So monitor the current in the protoype phase to save yourself a lot of hassle later (we had to regear during competition). You have a CVT so make sure you keep it geared down while accellerating or pushing. Most of the impedance that limits current is not the internal resistance of the motor but the emf generated by the spinning coils in the magnetic feild. You might want to use an encoder to determine wheel speed and then let the program decide gearing. Good luck.
__________________
Electrical & Programming Mentor ---Team #365 "The Miracle Workerz"
Programming Mentor ---Team #4342 "Demon Robotics"
Founding Mentor --- Team #1495 Avon Grove High School
2007 CMP Chairman's Award - Thanks to all MOE members (and others) past and present who made it a reality.
Robot Inspector
"I don't think I'm ever more ''aware'' than I am right after I burn my thumb with a soldering iron"