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