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Forum Member
 
Group: Forum Members
Last Login: Saturday, August 02, 2008 3:55 PM
Posts: 35,
Visits: 141
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Hi Jason and Company,
I bought a couple of your gearhead motors a few weeks back to use on a small wireless robot controlled by the Serializer + Bluetooth module. I started noticing that one of the motors didn't always turn at the same speed as the other even though I was using a TravelAtSpeed command. Some times it barely turns at all. When I turn the slow motor by hand, it is noticeably harder to rotate than the other motor. Also, if I let the Serializer run TravelAtSpeed for more than 30 seconds or so, one of the chips (H-bridge?) on the side of the bad motor gets very hot (and starts to smell!).
Does this sound like a bad motor or bad controller?
--patrick
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Supreme Being
Group: Administrators
Last Login: Tuesday, September 02, 2008 9:05 AM
Posts: 270,
Visits: 400
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| Sounds like a bad motor to me! If the motor is heating up and getting harder to turn, if you're using PID control, the Serializer will dump more current into the h-bridge, thus causing it to heat up. I'll send you another motor. Please provide your address via a private post directly to me. FYI, when we get these motors, we test two things: 1.) Does the wiring look okay (sometimes they don't solder the wires to the motor securely) 2.) We apply power to the motor, and listen for any resitance and/or odd sounds/behaviors We've found that we have to perform these tests at a minimum to ensure our customers don't get bad motors. Our vendor does a pretty good job manufacturing these motors, but they do miss things from time to time, which is why I put this testing in place. So, I'm guessing that after some use, one of your motors has started to fail. :/ Best Regards!
Jason Summerour
President,
Summerour Robotics Corporation
Microsoft MVP
www.roboticsconnection.com
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