InstantForum.NET v4.1.4RoboticsConnection User Forumhttp://www.roboticsconnection.com/userForums/info@roboticsconnection.comThu, 20 Nov 2008 21:17:54 GMT20http://www.roboticsconnection.com/userForums/Topic513-16-1.aspxSounds 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.</P><P>I'll send you another motor. Please provide your address via a private post directly to me.</P><P>FYI, when we get these motors, we test two things:</P><P>1.) Does the wiring look okay (sometimes they don't solder the wires to the motor securely)</P><P>2.) We apply power to the motor, and listen for any resitance and/or odd sounds/behaviors</P><P>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.</P><P>So, I'm guessing that after some use, one of your motors has started to fail. :/</P><P>Best Regards!Thu, 22 May 2008 12:26:50 GMTjsummerourhttp://www.roboticsconnection.com/userForums/Topic513-16-1.aspxHi Jason and Company,<br><br>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!).<br><br>Does this sound like a bad motor or bad controller?<br><br>--patrick<br>Thu, 22 May 2008 11:25:27 GMTpirobot