Future-oriented Developments in Thruster and electric Drive Design

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1 Future-oriented Developments in Thruster and electric Drive Design Andreas Witschel, Split,

2 COMPARISON ECOPELLER TWIN PROPELLER SRE 340 CP D Prop = 2,1m PROPELLER LAY OUT 14 kn, w = 8%, t = 10%, P = 1200 kw SRE stipe efficiency curve! CP required in case of SM to shift efficiency curve to left. OP 12 kn Efficiency maximum SRE > STP Efficiency at lay out point +1% more for SRE compared to STP STP shows flat efficiency curve! STP reacts efficient on SM! STP 340 D Prop = 2,0m 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 YOUR PROPULSION EXPERTS Efficient bollard pull due to CP system and full power available in bollard pull Efficient bollard pull due to 181,4% higher propeller area compared to SRE 340 CP, however on torque limit soon, therefore reduced input power

3 SRE SCHOTTEL ECOPELLER Rating C Opt. DPropeller [kw] [mm] SRE 340 SRE 430 SRE 460 SRE 560 SRE 640 SRE 700 SRE Type range Typical applications Small PSV Large PSV Meduim size ferries Special applications Megayachs YOUR PROPULSION EXPERTS MPSV/ DSV/ OCV Large ferries 3

4 HYDRODYNAMICAL EFFICIENCY STRONG RUDDER EFFECT Gear housing and fin form a rudder. This leads to following advantages: Ideal for ships with low course stability Less steering angle needed to generate a steering momentum on hull Less oblique inflow to propeller and therefore an increased propeller efficiency EXCELLENT HYDRODYNAMIC EFFICIENCY η 0 indication based on 0 steering angle! Increased propeller diameter at low propeller speed Slim stem shaft Comfortable distance of propeller to stem shaft Slim lower gear due to HTG technology CFD optimized lower gear shape

5 SCHOTTEL HTG High Torque Gear Asymmetrical profile Symmetrical profile Free flank design: 5-Axis CNC mill Optimized tooth root design Reduced Herzian pressure! + 15% torque based on same size Cycloid 554 MPa / 100% Optimized (5-Axis) 384 MPa / 69.3% 5

6 SRE = GREEN TECHNOLOGY REDUCED GEAR OIL CAPACITY LEACON SEALING SYSTEM (OPTION) Oil free spaces Leakage tank (underpressure) Waterline 18% less gear oil Water leakage Oil leakage DNV-GL approved oilwater interface

7 SCHOTTEL Compact Drive TECHNOLOGY SCD Features Lean design: Less height No motor foundation and alignment Less rotating parts GEISLINGER Gain in mech. Efficiency (97%) Top efficient asynchronous motor (97%) 7

8 SCHOTTEL Zero Conversion Loss Drive Typical ferry operation: v Load dependent draught variations v 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

9 Function of Zero Conversion Loss Drive The electric principle: LCL 50% SINUS 100% Rapid switch over! SCHOTTEL patent: DE A Operation modes: AFE converter operation Motor on direct board net = DOL Necessary lay out condition: U, f Boardnet = U, f Nominal Propulsion Motor

10 The Operation Principle of SRE CP & ZCL Drive SCD Motor frequency controlled Pitch / propeller speed: combinatory curve Power limited by pitch limitation to max. AFE frequency converter power SCD Motor in DOL mode directly connected to board net Motor at constant nominal speed Thrust variation by pitch variation No frequency conversion loss 10

11 Electrical Efficiency SRE 340 CP & 850A ZCL Drive Operation point n Fi' Mmech Pmech U1 f1 P1 Eta I1 cos ϕ Unit rpm % Nm kw V Hz kw % A Motor lay out point 790, , ,7 96, ,88 0, AFE operation 897,53 90, , ,17 96, , A) Bypass 50 Hz net 747,56 108, ,3 96, ,28 0, B) Bypass 60 Hz net 896,42 89, , ,8 96, ,62 0, 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 rpm q 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

12 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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