Thread: Cooling Drill Motors
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Unread 23-06-2002, 23:48
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#0047 (ChiefDelphi)
  
Join Date: May 2001
Location: Pontiac, MI
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Re: Hot Drill Motors
Posted by Al Skierkiewicz at 1/30/2001 8:44 AM EST


Engineer on team #111, Wildstang, from Wheeling High & Rolling Meadows High and Motorola.


In Reply to: Cooling Drill Motors
Posted by Gary Bonner on 1/29/2001 12:45 AM EST:



This has been an issue from the beginning of time. The motors are designed to run at a particular loaded RPM and the internal fans running at that speed should be enough to cool the motor. Unfortunately, we run them way under that speed and at higher loads that what they were designed for. If you are overheating motors, the first thing is to check gear ratios to see if you can increase motor RPM (motor curves are a big help here. A warning sign that gear ratios are off is resetting circuit breakers in motor speed controllers or blown fuses.) A change is software to reduce motor currents is also helpful. Let us not forget that a mounting assembly that draws heat away from the case is also a big help.
Finally, as a general rule, reworking the steel case on any motor that contains a magnet assembly is almost certain death to the motor. If the filings do not end up in the elctrical circuit, they will usually align with the magnet structure and be caught in the gap between the magnet and the armature.
Al
P.S. In past years, high motor currents were encountered in pushing matches with other bots, this year they will be encountered pulling a goal or stretcher up and over the ramp.
P.P.S. Some cool in a can contains freon which if directed at a bearing will wash out the lubricant. Use with caution.


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