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Unread 24-01-2011, 02:21
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Mike Betts Mike Betts is offline
Electrical Engineer
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Team Role: Engineer
 
Join Date: Dec 2001
Rookie Year: 1995
Location: Homosassa, FL
Posts: 1,442
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Re: articulating arm help

Quote:
Originally Posted by bobosalad View Post
what is brake mode?
Bob,

A DC motor converts electrical power to mechanical power. If you remove the input voltage and spin the mechanical side, the motor becomes a generator.

As a generator, if the electrical terminals are open, there is no current and the "drag" of the motor on the mechanical system is at a minimum (just the frictional losses are felt).

However, if you short the electrical input leads to the motor, it generates electrical current from the mechanical system. This requires that the mechanical system to do more work hence, the motor resists the rotation.

So, for either the Jaguar or the Victor, if the brake/coast jumper is set to "coast" the motor offers the least mechanical resistance that it can when commanded to no speed. Likewise, In the "brake" position, the speed controller will offer the greatest mechanical resistance to rotation when off.

Hope this helps.

Regards,

Mike
__________________
Mike Betts

Alumnus, Team 3518, Panthrobots, 2011
Alumnus, Team 177, Bobcat Robotics, 1995 - 2010
LRI, Connecticut Regional, 2007-2010
LRI, WPI Regional, 2009 - 2010
RI, South Florida Regional, 2012 - 2013

As easy as 355/113...