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Unread 17-06-2011, 21:34
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Re: 6 motor drivetrain gearboxes

Quote:
Originally Posted by Frenchie461 View Post
Just from my own curiousness, how do teams that use 6 motors on their drivetrains get the gearboxes right, since the RS-775 turns at 19500 RPM and the cim only turns at around 5500 RPM.
The RS775 that you were provided in the KoP has a rated free speed of 13000rpm at 12volts, not 19500. The CIM's rated free speed is 5310rpm not 5500. The ratio 13000/5310 = 2.45 so you would gear the RS775 down accordingly. That way, the CIM and the RS775 will operate at the same percent of their respective free speeds.

Quote:
I assume that the motors need to be turning at the exact same speed so the motors aren't trying to turn a wheel at two different speeds.
As explained above, you don't want the CIM and the RS775 operating at the same rpm. You want them operating at the same percent of their respective free speeds. You do this by gearing them differently.

If you don't get the gearing exactly right, the motors don't "fight" each other: they both are powering their respective wheels. But one will be working "harder" than the other because it will be at a different operating point on its power curve.


 


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