Help reading data sheet

[JamesDavies]

This is the datasheet for the 0.8kw Iskra motors.

http://imgur.com/oq0XGab

Am I right in reading the stall current as (about)110 amps?

Thanks,
James.

[mark_m]

The 110A point isn't at stall - I think its the current at 3000rpm/3.75Nm. Stall isn't shown on that chart, but extrapolating from what's there I'd guess stall current is ~230A.

A fairly useful simplification for DC motors is that peak power is generally at half maximum rpm, the current drawn there will be ~half of stall, and the motor will be ~50% efficient. So for a 0.8kw/800watt peak power output motor the motor will be consuming 1600watts at peak power output. 1600w/12V = 133A. Stall current would therefore be ~266A.
This doesn't really work for brushless motors, very small/inefficient ones, or where the 'rating' is for the continuous output, but I find it a useful guide to quickly estimate motor power/current where there's limited info on spec sheets.

[JamesDavies]

Thanks for that! That was what was confusing me. I couldn't see where the speed went to 0 but want sure if there was something I was missing.
Thanks, James.

[JamesDavies]

Another quick question- does the graph show stall torque? Is there a way to work this out? Cheers.