Society of Robots - Robot Forum

Electronics => Electronics => Topic started by: mobz on October 30, 2007, 07:51:27 PM

Title: motor specifications
Post by: mobz on October 30, 2007, 07:51:27 PM

In choosing motors i dont know which one to choose from to design a maze traversing robot.
Im looking for speed and power and i will be using a 6xAA NiMH battery pack(2500 mA/h)

the specs are
1.       143:1,                               
           43 in*oz,
           70 rpm,
           5V, 57.6 mA[/color]

2.       120:1,
         25 in*oz,
         145 rpm,
        5V, 88 mA

An explanation will be appreciated

Title: Re: motor specifications
Post by: frank26080115 on October 30, 2007, 08:06:48 PM

just high school physics
143:1 is your gear ratio
43 in*oz is your torque
70 rpm is your revolutions per minute
5V, 57.6 mA your motor runs on 5 volts, with a nominal operating current of 57.6 milliamperes

Title: Re: motor specifications
Post by: mobz on October 30, 2007, 08:18:22 PM

Quote from: frank26080115 on October 30, 2007, 08:06:48 PM

just high school physics
143:1 is your gear ratio
43 in*oz is your torque
70 rpm is your revolutions per minute
5V, 57.6 mA your motor runs on 5 volts, with a nominal operating current of 57.6 milliamperes

thanks frank so the  first one is better?

Title: Re: motor specifications
Post by: frank26080115 on October 30, 2007, 09:29:44 PM

i'd personally pick the 2nd one

it's either got a more powerful motor or is more efficient

if it goes too fast or can't carry too much weight, just use smaller wheels

Title: Re: motor specifications
Post by: Admin on October 31, 2007, 07:20:45 AM

This should help:
http://www.societyofrobots.com/mechanics_dynamics.shtml
and this too:
http://www.societyofrobots.com/RMF_calculator.shtml

You must factor in robot weight and wheel diameter, too.

Is a 43 in*oz motor strong enough to lift a rock? Depends on how big the rock is ;D