On 9/9/2015 12:53 PM, John Thornton wrote: > I need to calculate the power needed to move a gantry. I assume that > mass and velocity and acceleration are the key factors. Knowing those > how do you figure out the watts needed. This is not a milling machine so > no cutting forces need to be taken into effect. I'll be moving the > gantry with timing belts.
Power in it's most simple form is Speed * Force (opposing in the direction of speed) Looking at accelerating and the power you need there (no friction): You take mass and acceleration, which results in force. For example 500 kg * 0.1 m/s² = 50 N, this then can be recalculated in a Torque. so the longer you apply this acceleration, you're going to go faster. so the required power will go up with the speed. speed from acceleration v=at + v(t=0) say after 3 seconds you are at v=0.1*3 equals 0.3 m/s then you get a (due to acceleration) 0.3 * 50 = 15W (Power, Watt) If you then maintain a constant speed (let's assume rolling) with a coefficient of friction of 0.05 then you get a force: 500 kg * 9.81 (gravity) * 0.05 = 245 N When you're constantly sliding at 0.3 m/s you need 73.5W At the last time in your acceleration, just before going into constant motion you'll need a peak power of 73.5 + 15 = 88.5W So all depends highly on how you choose your acceleration, mass, speed and friction. Do you want to optimize for time (max accel/decell with no constant speed) or do you have a max speed? Bas > > Thanks > JT > > ------------------------------------------------------------------------------ > Monitor Your Dynamic Infrastructure at Any Scale With Datadog! > Get real-time metrics from all of your servers, apps and tools > in one place. > SourceForge users - Click here to start your Free Trial of Datadog now! > http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Monitor Your Dynamic Infrastructure at Any Scale With Datadog! Get real-time metrics from all of your servers, apps and tools in one place. SourceForge users - Click here to start your Free Trial of Datadog now! http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
