In Problem 6.1, you are given the following relationship:
This should indicate to you that since the resulting flow depends
both on the commanded current (i) and on some
force of pressure (P), you will need to balance whatever
torque is generated from the rotating table and roller bearings
(shown in the figure) with the pressure force (P) in the
hydraulic motor.
You should be to develop your own relationship between
torque and pressure by balancing power in and power out.