### Author Topic: How to determine load capacity of motor?  (Read 4696 times)

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#### MaltiK

• Robot Overlord
• Posts: 300
##### How to determine load capacity of motor?
« on: January 02, 2009, 09:45:37 PM »
In the Motor Calculator on this site it only allows input of motor load capacity, I want an output, how do I do this, knowing the specs. For example, the motor I am looking at has:

With an encoder, motor, and 30:1 gearbox

Rated voltage         12v
Rated torque       1.5kg/cm
Rated speed        170rpm
Rated current       530mA
Stall Current        2.5A
Rated output       4.22W
Encoder counts per output shaft turn       360
Warranty

• Supreme Robot
• Posts: 11,680
##### Re: How to determine load capacity of motor?
« Reply #1 on: January 10, 2009, 09:48:34 PM »
Quote
In the Motor Calculator on this site it only allows input of motor load capacity, I want an output, how do I do this, knowing the specs.
Hmmmm to be honest I don't understand your question.

Do you mean the maximum torque given at a specific speed?

#### want2learn

• Robot Overlord
• Posts: 189
##### Re: How to determine load capacity of motor?
« Reply #2 on: January 11, 2009, 12:40:33 AM »
I've never used the calculator so can't comment on that.

There are a load of things that can affect the load your motor will move i.e. drive motors for a robot or a joint in an arm with the same motor will be able to move different loads.

Also if they are to be drive motors: Supply voltage (motors don't have to be run at their rated voltage), gearing on the output, efficiency of the gearing, wheel size, will the robot run on gradients, indoors or out, these and other things will affect the load your motors will cope with.

A suggestion, once you have it worked out is to try and build to about 75% of whatever you calculated, I'll bet it ends up heavier than you think.
The question that drives me hazy:

Am I, or the others crazy?