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Basic

Motor Operating Principle

• Sauer Danfoss LSHT motors are fixed displacement, high torque motors.

– For a given oil flow and pressure, the displacement determines the torque and speed

– For a given displacement,

the oil flow rate determines

the speed, and the pressure

determines the torque

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0 10 20 30 40 50 60 70 80

OML

OMM

OMP / DH

OMR / DS

OMH

OMEW

OMS

OMT

OMV

TMK

TMT

TMV

KW

Basic

Motor Program

Mini Motors

Medium-sizedMotors

Large Motors

O – series

Large Motors

T- series

Large

Small

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• Hydraulic energy (flow/pressure) is translated into mechanical energy by means of a gearwheel set, cardan shaft, andoutput shaft.

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Basic

Motor Operating Principle

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Basic

The Gearwheel Set

• The Gearwheel set consists of two parts

1. External rim (rollers)

• Integral part of motor housing

2. Internal gearwheel

• Rotates within the rim and orbits around the center

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Basic

The Cardan Shaft

• The cardan shaft transmits the torque from the gearwheel shaft to the output shaft

• The cardan shaft design allows the cardan shaft centerline to orbit with the eccentricity of the gear set

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Basic

The Output Shaft

• The output shaft transmits the torque to the application.

• The output shaft and bearings also bear the radial load

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Basic

How does it work?

• A valve is needed to meter flow into and out of the chambers in the gear wheel.

• Sauer Danfoss motors utilize one of two types of valves

– Spool valve

– Disc Valve

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Basic

How does it work?

• Spool Valve– The spool valve is integrated into the shaft

– The cardan shaft therefore serves two purposes—to transmit torque, and to rotate the valve

– This design results in a compact motor with few rotating parts

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Basic

How does it work?

• Disc Valve

– Distributor valve separated from the output shaft and driven by a separate cardan shaft

– A balance plate counterbalances the forces around the distributor valve minimizing volumetric and mechanical losses

– This design results in precise valve function with high volumetric efficiency at all pressures

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Overview

Main types

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Selection

Application Considerations

• Geroller vs. Gerotor

• Spool Valve vs. Disc Valve

• Bearing Capacity / Shaft Strength

• Shaft Seal Considerations

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Selection

Geroller vs. Gerotor

– Advantages of Geroller motor• Smoother running

• Better efficiency (and more consistent efficiency over life of motor)

• Better life

– Particularly in applications with many starts/stops/reversals

– Advantages of Gerotor motor• Cost !

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– Advantages of Disc Valve• Higher volumetric efficiency

– Steady speed at lower flows

• No timing error due to deflection in main cardan shaft

– Advantages of Spool Valve• Low cost, simple design, Low weight

Selection

Spool Valve vs. Disc Valve

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Selection

Roller Bearings vs. Journal Bearings

– Journal Bearings• Continuous operation

• Mainly one direction of rotation

• Moderate radial and axial loads

– Needle Bearings• Many starts and stops

• Reversing load

• Moderate radial and axial loading

– Roller Bearings• Many starts and stops

• Reversing load

• High radial and axial loading

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High Pressure Shaft Seal

Standard Shaft Seal

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Selection

Shaft Seal Considerations

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Mini Motors

Specifications

Specifications OML OMM

Displacement cm3/rev 8 - 32 8 - 50

Max Cont. Pressure drop bar 70 100

Max. Cont. Oil flow l/min 16 20

Max. Int. Output kW 2.0 3.2

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Medium Size MotorsMENU

OMP DH OMR DS OMH OMEW

Displacement cm3/rev 25 - 400 36 - 400 50 - 375 50 - 375 200 - 500 100 - 400

Max Cont. Pressure drop bar 140 125 175 140 175 200

Max. Cont. Oil flow l/min 60 60 60 60 74 60

Max. Int. Output kW 13 12 15 14 18,5 15

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Large Motors

OMS OMT OMV TMK TMT TMV

Displacement cm3/rev 80 - 500 160 - 500 315 - 800 160 - 470 250 - 630 400 - 800

Max Cont. Pressure drop bar 175 200 200 250 250 250

Max. Cont. Oil flow l/min 75 125 200 80 125 200

Max. Int. Output kW 21 40 64 27 51

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� Special Flange

� Splined shaft

• 1 inch

• 1 ¼ inch

� Standard Flange

� P.T.O. shaft

� A2 flange

� SAE B Flange� Wheel Flange

� Tapered Shaft

• 35 mm

• 1 ¼ inch

� Magneto Flange

� Cylindrical Shaft

• 32 mm

• 1 inch

• 1 ¼ inch

Large Motors – OMS/T/V

Standard Flange & Shaft Options

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Output shaft Cardan shaft Valve drive Distributor valve

Large Motors – TMK/TMT/TMVW DesignMENU

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Motor Options

OML OMM OMP DH OMR DS OMH OMEW OMS OMT OMV TMK TMT TMV

Painted Motors O O O O O O O S O O O S S S

Wheel Version S S S S S S S S S

Motor with Needle Bearings S S

Motor with Special Dust Seal O O O O

Low Leakage Motor O O

Motor with Corrosion Resistant Parts S S

Motor with Endport S S S O S

Short Motor S S S S

Ultra Short Motor O O O O

Motor with Speed Sensor O O O O O O

Motor with Reinforced Parts O O O

Motor with Integrated Flushing Valve O

Slewing Motor O

Motor with Brake Nose S O O

Motor with Negative Brake S S S S

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S = Standard

O = Optional

Blank = Not available

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Motor Options

Wheel Motor

OMPW

OMPW N

OMRW N

OMEW

OMSW

OMTW

OMVW

TMKW

TMTW

TMVW

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Motor Options

Special Dust Seal

Gamma-ring

Grease

Standard dust seal

Shaft seal

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Motor Options

Short Motor

OMSS

OMTS

OMVS

OMTS

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Motor Options

Ultrashort

OMSU

OMTU

OMVU

OMTU

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Motor Options

Motor with negative brake OMR F

Displacement 80-375 cm3/rev

Holding torque 400 Nm

Min. brake release pressure 21 bar

Max. pressure in brake line 200 bar

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Motor Options

Motor with speed sensor

OMM EMD

OMP EMD

OMR EMD

OMS EMD

OMT EMD

OMV EMD

TMK EMD

TMT EMD

TMV EMD

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New

EMD speed sensor for Orbital-motors.

• Speed and Direction output – Pulse + Direction signal

– Quadrature signal

– CAN signal (J1939)

• Modular design– Available for OMM, OMP, OMR, OMS, OMT, OMV, TMK, TMT

and TMV

• Adapt the speed sensor to your needs with PLUS+1 Service Tool

• Highest resolution in the market – 180 pulses/revolution (default setting)=> 1 deg resolution

• Easy mounting – mount at needed angle and insert click lock

• Sensor is not in contact with oil making it robust and exchangeable in the field

• Compact design

• IP 69K*

• Patented design

OMTW with EMD

* If Deutsch connector gets additional protection

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EMD speed sensor for Orbital-motors

Examples of EMD Applications

Beet harvester

Forestry harvester head

Paver Harvester Skid Steer Loader

Forestry machine

Salt spreader

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Applications

Mini & Medium-sized Motors

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Applications

Large Motors O-Series

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Applications

Large Motors T–Series

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Where do I find information on LSHT Motors?

Support

Literature

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• Catalogues

• Tech Notes

• Service Notes

• Intranet / Internetwww.sauer-danfoss.com

• Contactsmodriscoll@sauer-danfoss.com

dmaclennan@sauer-danfoss.com