Product description
Operating principle for OMS, OMT and OMV motors
Hydraulic orbital motors convert hydraulic energy (pressure, oil flow) into mechanical energy (torque and
speed). Danfoss orbital motors are of fixed displacement high-torque design. For a given oil flow and
given pressure the displacement (size of motor) determines the speed and torque. For a given
displacement (size of motor) the speed is determined by the oil flow rate and the torque is determined by
the pressure differential.
The operating principle of the motor is based on an internal gear design, consisting of a fixed external
gear reaching against an internal gear through which the output torque and speed are transmitted. The
distributor valve in the OMS, OMT, and OMV motors is of the disc valve design which is driven
synchronously by the internal gear through a cardan shaft ensuring that the individual chambers of the
motor are filled and emptied precisely.
A: Output shaft
B: Cardan shaft
C: Gearwheel set
D: Valve drive
E: Check valve
F: Disc valve
All parts included in the motors are designed to provide long service life, i.e. long service life with high
efficiency and a minimum level of required service.
Technical specification for OMS, OMT and OMV motors
All necessary design information for instance maximum pressure rating, maximum flow, maximum radial
load etc. is provided in the Technical Information catalogues - please see Technical Information for the
OMS, OMT and OMV Orbital motors with literature number 520L0407.
The rated data which we publish in our Technical Information is based on the use of premium mineral
based hydraulic oil with a viscosity of 35 mm
2
/s.
Danfoss declines any responsibility in case of use of the motor in operating conditions not allowed
according to the information shown in this User Manual and above Technical Information.
Oil types / Operating fluids
In a hydraulic system the most important task of the oil is to transfer energy. At the same time the oil
must lubricate moving parts in hydraulic components, protect them from corrosion, and transport dirt
User Manual
ATEX instruction for OMS, OMT and OMV
Technical information
©
Danfoss | September 2016 11160602 | AQ00000213en-US0103 | 9
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