Case Study: Danfoss Power Solutions
Danfoss
Danfoss Power Solutions, previously known as Sauer Danfoss, is a world leader in producing hydraulic systems for the construction, agriculture and mobile equipment industries. Danfoss Power Solutions has more than 3000 different types of orbital motors, varying in size (rated displacement), speed, operating torques and maximum outputs. [1]
Danfoss orbital motors variety Minimum value Maximum value
Displacement 8 cm3 800 cm3
Speed 600 rpm 2500 rpm
Torque 13 Nm 2700 Nm
Power 2.0 kW 70 kW
Table 1. Summary of minimum and maximum values of different orbital motor types[1]
One of the company’s priorities is to give the best-in-class efficiencies, leading to energy savings. The European emission standards are strengthening the limits with …show more content…
Net Power Date* CO HC HC+NOx NOx PM kW g/kWh
G 37 ≤ P < 75 2004.01 5.0 1.3 8.3 7.0 0.4
N 56 ≤ P < 75 2012.01 5.0 0.19 - 3.3 0.025
P 37 ≤ P < 56 2013.01 5.0 - 4.7 - 0.025
Mean change in % 0 - 85 -44 -53 -93 D 18 ≤ P < 37 2001.01 5.5 1.5 9.5 8.0 0.8 K 19 ≤ P < 37 2007.01 5.5 - 7.5 - 0.6
Mean change in % 0 - -44 - -25
Table 2.Summary of emissions for diesel engines with Net Power similar to the range of Danfoss Orbital motors …show more content…
In addition, wear on journal bearings is easy to notice which allows prevention of failure and reoccurring failure.
Use of bearings in the orbital motor
Journal bearings are essential part of any motor, are used only in direct connect applications, and have infinite life in theory. However, when talking about life in journal bearings, other factors such as vibrations, lubrication oil, speed, are usually considered and wear often comes before any other failure of the journal.
In operations where the speed is low, the axial loads are high and the vibrations are not negligible, rolling element bearings are used, typically, needle or tapered bearing. Despite the listed limitations of the hydrodynamic bearings, they seem to perform equally good in terms of efficiency and energy losses as the anti- friction bearings. Given bellow is a summary from a previous study made by Siemens for SKF bearings, tested with exactly the same specifications.
HP Total loss without bearing loss Bearing loss in
Danfoss Power Solutions, previously known as Sauer Danfoss, is a world leader in producing hydraulic systems for the construction, agriculture and mobile equipment industries. Danfoss Power Solutions has more than 3000 different types of orbital motors, varying in size (rated displacement), speed, operating torques and maximum outputs. [1]
Danfoss orbital motors variety Minimum value Maximum value
Displacement 8 cm3 800 cm3
Speed 600 rpm 2500 rpm
Torque 13 Nm 2700 Nm
Power 2.0 kW 70 kW
Table 1. Summary of minimum and maximum values of different orbital motor types[1]
One of the company’s priorities is to give the best-in-class efficiencies, leading to energy savings. The European emission standards are strengthening the limits with …show more content…
Net Power Date* CO HC HC+NOx NOx PM kW g/kWh
G 37 ≤ P < 75 2004.01 5.0 1.3 8.3 7.0 0.4
N 56 ≤ P < 75 2012.01 5.0 0.19 - 3.3 0.025
P 37 ≤ P < 56 2013.01 5.0 - 4.7 - 0.025
Mean change in % 0 - 85 -44 -53 -93 D 18 ≤ P < 37 2001.01 5.5 1.5 9.5 8.0 0.8 K 19 ≤ P < 37 2007.01 5.5 - 7.5 - 0.6
Mean change in % 0 - -44 - -25
Table 2.Summary of emissions for diesel engines with Net Power similar to the range of Danfoss Orbital motors …show more content…
In addition, wear on journal bearings is easy to notice which allows prevention of failure and reoccurring failure.
Use of bearings in the orbital motor
Journal bearings are essential part of any motor, are used only in direct connect applications, and have infinite life in theory. However, when talking about life in journal bearings, other factors such as vibrations, lubrication oil, speed, are usually considered and wear often comes before any other failure of the journal.
In operations where the speed is low, the axial loads are high and the vibrations are not negligible, rolling element bearings are used, typically, needle or tapered bearing. Despite the listed limitations of the hydrodynamic bearings, they seem to perform equally good in terms of efficiency and energy losses as the anti- friction bearings. Given bellow is a summary from a previous study made by Siemens for SKF bearings, tested with exactly the same specifications.
HP Total loss without bearing loss Bearing loss in