Thread: Four motors at the same speed?
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Unread 23-06-2002, 22:51
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#0047 (ChiefDelphi)
  
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Re: Four motors at the same speed?
Posted by Dodd Stacy at 1/13/2001 4:16 PM EST


Engineer on team #95, Lebanon Robotics Team, from Lebanon High School and CRREL/CREARE.


In Reply to: Four motors at the same speed?
Posted by Mark Garver on 1/13/2001 3:18 PM EST:



: Can you design a drivetrain that allows you to use four motors?

Simple response: yes.

:The motors I am think of are the drill and Fisher Price motors. I would put the drills in back and the Fisher Price in front. In a no load simulation you could get all four motors to run at the same speed, but what about under load?

Gearing the motors so that all wheels had similar no-load surface speed (they don't even need to be the same diameter wheels) is the main requirement.

:Would only two motors drive and the other two act as generators?

No. This would only happen with induction type (non-synchronous) motors, like the ones in the kit, if one pair of motors was geared so "tall" that they (while under significant load) drove the bot at such a high speed that the other pair was being rotated by the moving bot (overdriven or overrun) at a speed faster than their no-load speed. Sorry for the long sentence.

Go for it, Mark. Good luck.

Dodd



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