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Re: Cheap Torque Measurement?
Quote:
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Originally Posted by Al Skierkiewicz
...I think if you throw in a fudge factor for efficiency of each of the motors (I am guessing between 90 and 95%)...
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Al,
The efficiency of DC motors is dependent on speed and is usually much less. Take the CIM for example:
Stall Current = 114A
Stall Torque = 2.45 N*m
Free speed = 5342 RPM = 559 radians/sec
Efficiency at Max Power = (1.23 N*m * 280 rad/sec) / (12V * 57A) = 50%
Therefore, the mechanical power at the spindle will be 343W and I would expect the power dissipated in the generator’s brake resistor to be about 172W or so…
Mike
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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...
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This isn't an engineering fair and demonstration, it's FRC. Defense is part of the game. You can't expect a good FRC team to just sit there and get clobbered by a full-court shooter; they're going to engineer a solution to the problem. - Kevin Sevcik [more] 
13-06-2005, 03:41
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