Hi Norrick,
Did you observe the X-axis of both the graphs from Maxwell and Rmxprt?
RMXprt plot is the torques vs. speed graph with a full range of speed values. Whereas Maxwell performs the single-point analysis with the angular velocity set during the motion setup. i.e., 5Nm torque corresponds to the Speed assigned in the motion setup.
If you drew a horizontal line on the RMXprt plot at 5 Nm it should match closely with the corresponding speed that you set on the Maxwell setup.
Regards,
Navya