Hi Kubing ,
In this post you can watch a SEW R37DR63L4 with the specicifications:
http://www.x-sim.de/forum/viewtopic.php?f=39&t=132&start=160#p2011In the other post for the simulator I made for my friend that are 2 SEW RF27DT71D4 0,37 kW with 38 rpm at 50Hz.
http://www.x-sim.de/forum/viewtopic.php?f=37&t=293#p2058For simulator 2dof with 2 motors which a universal joint under the seat I know that 2 SEW R27DR63S4 0,12 kW gear ratio 100 (12 rpm at 50 Hz) are enough !!
In your case that is a 3 dof with lifting but with 0,37 kW or 0,5 kW . With 0,37 kW that is 3 times more that the 2dof with 0,12kW
I can't at this moment better help you as this post ( projects not yet finished!!)
The most difficult point is to choose the right gear ratio.The question is how many turns need the motor for running as well for our application.
For an half turn output gear shaft the motor make 50 turns with a gear ratio of 100 and so high is the gear ratio so high is the torque!!
If I can finish the 2 dof simulator I will have a good comparaison .I know that Riton has a simulator with 14 rpm at the output shaft.
Best Regards