Defining proper initial geometry of an 8 MW liquid-cooled direct-drive permanent magnet synchronous generator for wind turbine applications based on minimizing mass

Alexandrova, Yulia; Semken, Scott; Polikarpova, M.; Pyrhönen, Juha

doi:10.1109/icelmach.2012.6350036

Cited by 7 publications

(7 citation statements)

References 2 publications

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“…The main focal point of this paper is the development of a cooling solution and the thermal analysis of an 8 MW direct-drive permanent-magnet synchronous generator (DD-PMSG) for offshore wind turbines applications. The particulars regarding the electro-magnetic and mechanical designs of this direct-drive permanent-magnet wind turbine generator have been published in [4,[13][14][15][16]. This paper provides basic design equations to implement DLC using stator copper windings fashioned from copper conductors with internal coaxial cooling conduits.…”

Section: Nomenclaturementioning

confidence: 99%

“…Each tooth coil consists of 20 series-connected 1.15 m stainless steel tubes, so the total length of each tooth coil is 25 m (series system by (18) and (19). Equations (20) and (21) with m = 12, n = 12 and k = 1 are applied to simulate each generator segment and further for the whole machine (16). The reliability weakness of the GCLs are tubing connectors, which are prone to corrosion or sealing issues [44,45].…”

Section: Reliability Analysis Of the Generator Direct Liquid Cooling mentioning

confidence: 99%

“…Construction and size for an external rotor 8 MW DLC DD–PMSG a Studied generator b Stator segment [4, 15, 16]…”

Section: Direct Liquid Cooling System Of Generator Stator Windingmentioning

confidence: 99%

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Direct liquid cooling for an outer‐rotor direct‐drive permanent‐magnet synchronous generator for wind farm applications

Polikarpova

Ponomarev

Röyttä

et al. 2015

IET Electric Power Applications

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Offshore applications, which call for the largest and most powerful wind turbines, demand a higher standard of reliability and maintainability. Direct-drive permanent-magnet synchronous generators (DD-PMSGs) are increasingly being specified for these applications. The major shortcoming to traditional high-powered direct-drive generators is extraordinary size and mass leading to extraordinary cost. To generate higher powers at low rotational speeds, directdrive generators must either develop greater tangential stresses or be larger in diameter. For traditional air-cooled generators, higher power generally means a much larger diameter. Dramatic cost savings can be realised with the development of a more effective stator windings cooling system that puts further the limit on current density enabling the development of high-power direct-drive generators of substantially smaller diameters. This study presents a direct liquid cooling system design for an 8 MW outer-rotor DD-PMSG. The approach is new for wind turbine generators, so its impact on the thermal behaviour and reliability for the total electrical machine has been evaluated and reported here. Testing of a stator coil prototype (1/72nd of the complete stator) with internal cooling liquid flow is also reported to demonstrate the workability of the designed cooling solution.

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Section: Nomenclaturementioning

confidence: 99%

Section: Reliability Analysis Of the Generator Direct Liquid Cooling mentioning

confidence: 99%

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Direct liquid cooling for an outer‐rotor direct‐drive permanent‐magnet synchronous generator for wind farm applications

Polikarpova

Ponomarev

Röyttä

et al. 2015

IET Electric Power Applications

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“…In here, seven concentrated forces are applied for each blade and eight for the tower to express the wind loads. Finally, F w sums up all the wind loads acting on each component as shown in equation (2). The number n is 7 for the blade and 8 for the tower…”

Section: Modeling Of External Loadsmentioning

confidence: 99%

“…A liquid-cooling system for the direct-drive generator was designed to satisfy the requirement of the power-increasing of the wind turbines. 2 Motions of the wind turbine based on a truss mass method and the wind loads were ignored in the analysis. Actually, due to the difficulties in applying the wind and wave loads on the huge floating wind turbine, the real test is hard to be proceeded with full-size model by now.…”

Section: Introductionmentioning

confidence: 99%

Flexible dynamic analysis of an offshore wind turbine installed on a floating spar platform

Zhu

Yoo

2016

Advances in Mechanical Engineering

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Flexible dynamic analysis is a critical process in designing offshore wind turbines that are composed of several huge components. This process was implemented with a hybrid method of finite element multibody system using commercial software in this article. Based on this method, the tower and blades were modeled as flexible components using threedimensional solid elements. The effect of flexible deformation of the tower and blades on the global motions of the floating wind turbine was investigated by comparing the simulation results from the flexible body modeling with those from the rigid body modeling. The tower, blades, and spar platform were divided into sections according to the geometry configuration of the 5-MW OC3-Hywind floating wind turbine. The time-and position-dependent loads, coming from the wind, wave, and mooring system, were expressed approximately with respect to the divided sections. The relationships between the global motions and the external loads were studied, which indicated that the wind loads had dominant influences on the translational motions and the rotational motions were mainly generated by the propagating waves.

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Energy Conversion Systems for Offshore Wind Turbines

Anaya‐Lara¹

2018

Offshore Wind Energy Technology

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Defining proper initial geometry of an 8 MW liquid-cooled direct-drive permanent magnet synchronous generator for wind turbine applications based on minimizing mass

Cited by 7 publications

References 2 publications

Direct liquid cooling for an outer‐rotor direct‐drive permanent‐magnet synchronous generator for wind farm applications

Direct liquid cooling for an outer‐rotor direct‐drive permanent‐magnet synchronous generator for wind farm applications

Flexible dynamic analysis of an offshore wind turbine installed on a floating spar platform

Energy Conversion Systems for Offshore Wind Turbines

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