Carl-Filip Sewring, Carl-Fredrik Lie, Niklas Persson, Johan Schantz, Christer Ebbesson

Transcription

1 Carl-Filip Sewring, Carl-Fredrik Lie, Niklas Persson, Johan Schantz, Christer Ebbesson

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4 Advantages Widely supported method of augmenting airflow through the rotor. Simple sturdy construction. Disadvantages No identified disadvantages.

5 Advantages Proven method of enhancing augmentation of the aerofoil duct. Disadvantages A lot of different parts make it more complicated to design as well as manufacture. Makes the duct very big (a 3 meter diameter rotor means up to 7 meters rear diameter). The large size means it is heavier. May cause whistling effect.

6 Advantages Should enhance augmentation of the aerofoil duct. More compact than concept 2 means less complicated construction and lower size and weight. Disadvantages More complicated to design as well as manufacture relative to the clean aerofoil design. May cause whistling effect.

7 Advantages Proven design with good augmentation. Disadvantages More complicated to design as well as manufacture relative to the aerofoil design. Not very esthetically pleasing.

8 Spec. nr. Specification Weight 1 Complexity 5 2 Size 5 3 Weight 5 4 Wind augmentation factor 4 5 Noise 3 6 Esthetics 3 Spec. Concept 1 Concept 2 Concept 3 Concept 4 nr. Score Weighte d Score Score Weighte d Score Score Weighte d Score Score Weighte d Score Total

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10 Number of blades Wing profile Pitch angle Strength and narrowing

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12 Advantages When placing the generator in the tower with a planetary gearbox makes it a rather simple solution with few parts and a low level of complexity. Disadvantages A generator that satisfies the demands will be rather expensive. The total weight of the tower will be quite high. Negative effect on the wind flow. A brake needs to be added. The maintenance work gets harder with the generator and gearbox up in the air.

13 Rotor Conic gear Axle gear Spherical bearing Generator Advantages Reduced weight in the duct. Independent of generator size and weight. Easier maintenance work on the generator. Disadvantages Complex transmission through the tower. Harder maintenance work on the gears.

14 1 Rotor 2Variable pump 3Oil reserve 4Hose 5Engine 6rpm Pick up 7Generator Advantages Reduced weight of the duct by the weight of the generator Independent of generator size and weight Opportunity to control the rpm and keep it steady Using a fixed rpm lead to no need of power electronics Integrated break Low need of maintenance Disadvantages Quite complex system More parts than concept 1 & 2 Rather expensive solution

15 Spec. nr. Specification Weight 1 Weight 5 2 Size 4 3 Cost 4 4 Function 5 5 Maintenance 3 6 Efficiency 4 Spec. Concept 1 Concept 2 Concept 3 nr. Score Weighted Score Score Weighted Score Score Weighted Score Total

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17 Advantages Low complexity. Cheap. Easy to connect to the grid. Low maintenance needs. Disadvantages Need reactive power to start. Operate best at constant RPM. Heavy (two times the PMSM).

18 Advantages Medium complexity. Cheap. Has higher efficiency during variable RPM. Disadvantages Needs a constant amount of active power. Slip rings that need replacing. Heavy (two times the PMSM).

19 Advantages Low needs of maintenance. No need of external electric power. Light weighted (half of the others). Disadvantages Expensive due to the magnetized material. High complexity.

20 Spec. nr. Specification Weight 1 Complexity 3 2 Maintenance 4 3 Noise 3 4 Price 5 5 Size 2 6 Weight 1 Spec. nr. Concept 1 Concept 2 Concept 3 Score Weighted Score Score Weighted Score Score Weighted Score Total

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22 Eight aerofoil sections with an I-profile are attached (bolted) to a sturdy central ring. (Fig. 1) These sections are connected to each other at 3 points by curved beams bolted through the sections (Fig. 4 & 5). This is to make the construction sturdy. Formed plastic composite sheets are riveted to the aerofoil sections I-profile (Fig. 4). Three solid bars support the rotor and transmission package displaced so that the center of gravity is in the middle of the ring (Fig. 1). The lower bar with bigger circumference to carry load of the transmission package. The bars welded to the ring. An aerofoil structure will be constructed around the bars to reduce drag.

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24 Spec. nr. Specification Weight 1 Complexity 5 2 Weight 3 3 Durability 3 4 Logistics 1 5 Green 2 Spec. nr. Concept 1 Score Weighted Score Total 58

25 Clean aerofoil duct Custom designed rotor Hydraulic transmission Asynchronous generator

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