Can you repeat the question in another form?

The electric motor can be measured mechanically by 3 measurements:

1. Torque

2. Rotation speed

3. Energy

Regards

Yuval

To give you a correct indication would be necessary to know the motor type (electrical, internal combustion, turbine, ...), its size (1W or 1GW?), the scope of the modeling ( to know the response of the system to quasi-static load, impulsive or to know the energy consumption, the efficiency, etc)

Anyway a test on a instrumented bench able to log the motor data and the braking load would be good solution