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Unread 12-01-2004, 10:15
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Al Skierkiewicz Al Skierkiewicz is offline
Broadcast Eng/Chief Robot Inspector
AKA: Big Al WFFA 2005
FRC #0111 (WildStang)
Team Role: Engineer
 
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Rookie Year: 1996
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Re: DC Motor running as a Generator

Quote:
Originally Posted by Rickertsen2
If i understand you correctly, you are trying to build a variable reluctance brake... There is a way to LEGALLY do this. The speed controllers have a jumper which when enabled, causes them to act as a short circuit and effectively a brake, whenever they are sent a signal inside of their deadband. Well anyway all you have to do, if you want variable braking is to send them a duty cycle modulated signal, that switched from being inside the deadband, to just barely ourside it, but not enough so to make the motors even move.
Rick,
There is no way to legally accomplish this since the braking jumper on a speed controller cannot be controlled by the custom circuit board. It can only be controlled by a switch used as a sensor.
<R52> Custom Circuits may not:
• Directly affect any output devices on the robot, such as by providing power directly to a motor, supplying a PWM signal to a speed controller or supplying a control signal to a relay module.
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Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
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Storming the Tower since 1996.