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Unread 13-02-2011, 23:59
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Re: Denso window motor lockup when under load

Those motors have a worm gear set inside them, and as such with greater applied torque you have greater friction within the geartrain. I have not experienced the issue you have there, however I wager that if you were testing using a victor and a 12v battery you would not see this issue. Most variable voltage bench supplies cannot supply the current needed when these motors stall, or even to operate them at max efficiency. If your system reverses reliably with a 12 volt supply that can give the motor the current it wants (limited to less than 20A) then I wouldn't worry. The proper way to address this would be to put a limit switch so that the motor stops just a bit before the hard stop.
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Justin Stiltner
Lead Robot Inspector, VCU Regional
Unmanned Systems Lab, Virginia Tech
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