witschel future-oriented thruster and electric drive · pdf fileschottel your propulsion...

SCHOTTEL YOUR PROPULSION EXPERTS

Future-oriented Developments in Thruster and electric Drive DesignAndreas Witschel, Split, 10.10.2017

YOUR PROPULSION EXPERTS

SRE 340 CPDProp= 2,1m

Efficiency maximum SRE > STPEfficiency at lay out point +1%

more for SRE compared to STP

STP shows flat efficiency curve! STP reacts efficient on SM!

SRE stipe efficiency curve!

CP required in case of SM to shift efficiency

curve to left. OP 12 kn

Efficient bollard pull due to 181,4% higher propeller area compared to SRE 340 CP, however on torque limit soon,

therefore reduced input power

Efficient bollard pull due to CP system and full power available in bollard pull

v Lower propeller load due to double propeller system, less pressure pulses, more comfort

v Less space for propellers needed due to smaller propeller diameter

PROPELLER LAY OUT 14 kn, w = 8%, t = 10%, P = 1200 kW

COMPARISON ECOPELLER – TWIN PROPELLER

STP 340DProp= 2,0m


SRE 340 SRE 430 SRE 460 SRE 560 SRE 640 SRE 700 SRE 750

Rating „C“ [kW] 1200 1600 2000 2500 3000 3500 4600 5500Opt. DPropeller [mm] 2100 2500 2750 3100 3350 3600 4200

Type range

Typicalapplications Meduim size ferries

Small PSV Large PSV MPSV/ DSV/ OCV

Large ferries

MegayachsSpecial applications

3

SRE SCHOTTEL ECOPELLER


HYDRODYNAMICAL EFFICIENCY

STRONG RUDDER EFFECT

Gear housing and fin form a rudder. This leads to following advantages:

Ø Ideal for ships with low course stabilityØ Less steering angle needed to generate

a steering momentum on hullØ Less oblique inflow to propeller and

therefore an increased propeller efficiency EXCELLENT HYDRODYNAMIC EFFICIENCY

Ø Increased propeller diameter at low propeller speedØ Slim stem shaftØ Comfortable distance of propeller to stem shaftØ Slim lower gear due to HTG technologyØ CFD optimized lower gear shape

η0 indication based on 0° steering angle!

SCHOTTEL YOUR PROPULSION EXPERTS 5

SCHOTTEL HTG – High Torque Gear

Cycloid554 MPa / 100%

Optimized (5-Axis) 384 MPa / 69.3%

Optimized tooth root design

Asymmetrical profileSymmetrical profile

Reduced Herzian pressure!+ 15% torque based on same size

Free flank design: 5-Axis CNC mill


SRE = GREEN TECHNOLOGY

Oil freespaces

18% less gear oil

Waterline

Water leakage Oil leakage

Leakage tank(underpressure)

LEACON SEALING SYSTEM (OPTION)

DNV-GL approved oil-waterinterface

REDUCED GEAR OIL CAPACITY


SCHOTTEL Compact Drive TECHNOLOGY

7

SCD Features

§ Lean design:– Less height– No motor foundation and alignment– Less rotating parts

§ Gain in mech. Efficiency (97%)

§ Top efficient asynchronous motor (97%)GEISLINGER


SCHOTTEL Zero Conversion Loss Drive

Typical ferry operation: v Load dependent draught variationsv Weather depending sea margin!

Conclusion: ECOPELLER to be equipped with CP propeller for ferry application and optimum efficiency at all operation points.

The Zero Conversion Loss Drive has been developed for all types of thrusters with CP propellers. Therefore an ideal combination with SRE CP


Function of Zero Conversion Loss Drive

The electric principle:

Necessary lay out condition:U , f Boardnet = U , f Nominal Propulsion Motor

Operation modes:§ AFE converter operation§ Motor on direct board net = DOL

LCL

SINUS

SCHOTTEL patent:DE 10 2012 112 183 A1 2013.06.27

≥50%

100%

Rapid switch over!


The Operation Principle of SRE CP & ZCL Drive

10

Ø SCD Motor frequency controlledØ Pitch / propeller speed: combinatory curveØ Power limited by pitch limitation to max.

AFE frequency converter power

Ø SCD Motor in DOL mode directly connected to board net

Ø Motor at constant nominal speedØ Thrust variation by pitch variationØ No frequency conversion loss


Electrical Efficiency SRE 340 CP & 850A ZCL Drive

Operationpoint n Fi' Mmech Pmech U1 f1 P1 Eta I1 cosϕUnit rpm % Nm kW V Hz kW % AMotorlayoutpoint 790,07 100 12691 1050 675 52,86 1083,7 96,89 1073,88 0,86315535AFEoperation 897,53 90,77 9096,79 855 690 60 883,17 96,81 850 0,86820932A)Bypass50Hznet 747,56 108,14 12774 1000 690 50 1033,3 96,78 1057,28 0,81776163B)Bypass60Hznet 896,42 89,39 12783,2 1200 690 60 1237,8 96,94 1166,62 0,88781144

Resume:q Based on current limit of 850A of INGETEAM AFE frequency converter, this 1200 kW VEM Motor

is able to supply a power 883 kW at 96,8% q In case of 50 Hz board net and DOL mode this VEM motor is able to supply 1000 kW at 96,8%

efficiency at 747,56 rpmq In case of 60 Hz board net and DOL mode this VEM motor is able to supply 1200 kW at 96,9%

efficiency at 896,42 rpm


SRE 340 CP 1200 kW Zero Loss Drive

Advantages:

q 4% conversion loss savings in DOL mode (all free sailing time)

q High motor life time due to permanent SINUS supply in DOL and combinatory mode

q Silent motor operation due to permanent SINUS supply

q Frequency converter can be air cooled while being only active during maneuvering

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