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Unread 18-02-2011, 16:19
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AKA: Leav Oz-Ari
FRC #3316 (D-Bug)
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Re: A curious situation...

Quote:
Originally Posted by Mr. Van View Post
So we were testing our drive system last night and discovered a curious situation:

Of two motors in an AM SuperShifter, one is running opposite the other. Of course, this can often happen because one motor is wired backwards or its speed controller is receiving a reversed signal. In this situation, this is not the case.

The Jags that control both motors (tested individually) are both sending a positive voltage to the motors. The motors are wired identically. When each Jag is given the same control (via pwm), one drives the wheels forward and the other drives the wheels backwards.

We're at the point where we think that one of the motors is actually wired backwards internally.

Any ideas as to what's going on?

-Mr. Van
Coach, Robodox

Which motors are these? CIMs?

people have reported random polarity designations on the BaneBots 775, but I haven't heard of it happening on a CIM before.

Where did you get the motors from?
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"We choose to build robots this season and do the other things; Not because they are easy, but because they are hard."
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Participated in FIRST as a student: 2005-2006 (But still learning every season!)
Mentor: 2008 - ? (Team 2630 2008-2011, and Team 3316 since 2013)
Engineer: 2011 - ? (B.Sc. and M.Sc. in Mech. Eng. from the Technion IIT)
FIRST Volunteer - 2007 - ? (MC, FTA, FIRST Aid etc.)