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Mechanical Power Out Vs. Electrical Power In
Posted by Joe Johnson at 1/20/2001 3:33 PM EST
Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems. In Reply to: Re: How do people get hot motors? Posted by Patrick Dingle on 1/7/2001 9:57 AM EST: Mechanical Power OUT maximizes at 1/2 the stall torque with the motor running at 1/2 the free speed. The Electrical Power IN, peaks at the stall torque. The amount of heat generated is Mechanical Power Out - Electical Power In It is this term that makes the motors hot. In general, the Efficiency Curve : (Mechanical Power Out) / Electical Power In Looks like this: S.....**.................. P....*...*................ E...*......*.............. E...*.........*........... E..*.............*........ D..*................*..... ...*...................*.. /..T...O...R...Q...U...E.. The important thing to know is it peaks over on the far LEFT side of the Torque curve. THE BOTTOM LINE IS THIS: If you have a certain amount of mechanical work you want to do in a certain amount of time, you a have established how much mechanical power you need (e.g. get a robot and 2 goals up an incline in 6 seconds). In order to heat your motors up the least while doing this work is to design a geartrain that loads the motors in the 1/5 - 1/3 of stall torque range. Good luck and low motor temps to us all in 2001! Joe J. |
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