# Thread: Understanding (European) motor specs - help

1. ## Understanding (European) motor specs - help

I found a servo motor...but it was originally shipped to the European market, so I'm not 100% sure how to read the specs. If anyone could take a look at the attached table I made up, I'd appreciate it. I'm trying to figure out what the torque might be, at the nominal voltage and rpm.

note: I did change the comma (,) to decimal (.) in this table.

Thanks!
-Chris

2. It looks to me that they are 191 oz/inch torque =135 Ncm.
Al

3. I believe the 'n' subfix denotes "nominal".

Fa is probably axial force, Fr radial. ( = maximum load ratings for the motor axle?)

J is rotational inertia,

tm I guess is mechanical time constant (anybody knows how to use this? For setting PID params??? How?)

Pn is output (mechanical) power at nominal speed (3000 RPM / 60 * 2*pi * 1.35 Nm = 424 W)

M I believe denotes "Moment of Force", another name for torque. But Al, torque is not force per distance, but force times distance I seem to say that a lot in here . So 135 Ncm = 1.35 Nm = 191 oz*in.

Arvid

4. Thanks...looks like a pretty strong motor, which would give plenty of design headroom...

-Chris