I don't really know for sure why these particular values were set this way since it comes to me as a specification that is several groups/companies removed from the actual users of the equipment. In fact, the data was presented as winch line speeds with corresponding line pull specifications...
I need to size an electric motor for a traction winch appliction. the motor will be controlled by some kind of VFD and will be operated at either 900 RPM or 1800 RPM. At 900 RPM the required output torque is 14000 lbin and at 1800 RPM the desired motor torque is 7000 lbin. For VFD speed...