Society of Robots - Robot Forum
Mechanics and Construction => Mechanics and Construction => Topic started by: crash_ndie on August 16, 2010, 10:00:41 AM
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i thought id get my head round motors and gearing by upgrading my little girls electric car its to slow for her now. the motor it self is suprisinly small running 3 gears how can i work out what size motor is needed to keep the same pull but pick up the speed and make it faster ? also am changing it from a 6v system to a 12v 1 ill need a charge system? am thinking of using the same drive system for my robot but again it will need to be faster helllp !!
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Hint:
Gear reduction decreases output rpm and increases torque by the amount of the reduction.
You can measure the speeds of the current motor/gears and use the SoR motor calculator to get some feel for what is needed.
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have i worked this out right? if i turn the final drive gear a full revolution by hand an count how many turns the motor does this came out as 178-1 , if i then power the motor for 1min an count the number of times the final drive turns over the minuet witch came out at 51 ....
178 x 51 = 9078 rmp at the motor is this right ?
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Looks correct.
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whoooo rite all i have to do is find a 12v dc 2000 rpm motor that's 27mm wide and 40mm long with a spindle of 3mm across hummmm any ideas lol
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could always fit one of these in ;D
http://www.robotmarketplace.com/products/EMS-PMG132.html (http://www.robotmarketplace.com/products/EMS-PMG132.html)
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lmao now that would be mint ! but dont think missus would be to happy with it ::) women spoil all our fun :D
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humm dun my maths wrong it needs to be 20.000 rpm motor i need i dont think they make them that fast do they ?
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If you want to use the same gear ratio and double the output speed then you do need to double the motor RPM to about 20,000.
They do make motors that run this fast but they do cost more. Another way to to change the gear ratio or replace the motor/gear box with a gear motor that meets your requirements.