Design and Analysis of a New Fully Stator-HTS Motor

Qian, Chen; Liu, Zhengmeng; Li, Xiaohang

doi:10.1109/tasc.2013.2297316

Cited by 14 publications

(3 citation statements)

References 17 publications

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“…General Electric eliminated cryocouplers using a stationary superconducting coil and a rotating copper armature configuration [26]. In [27], a superconducting generator with a stationary superconducting armature and field windings is shown; the machine is similar to a switched reluctance machine.…”

Section: Introductionmentioning

confidence: 99%

A modular and cost-effective superconducting generator design for offshore wind turbines

Keysan

Mueller

2015

Supercond. Sci. Technol.

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Superconducting generators have the potential to reduce the tower head mass for large (∼10 MW) offshore wind turbines. However, a high temperature superconductor generator should be as reliable as conventional generators for successful entry into the market. Most of the proposed designs use the superconducting synchronous generator concept, which has a higher cost than conventional generators and suffers from reliability issues. In this paper, a novel claw pole type of superconducting machine is presented. The design has a stationary superconducting field winding, which simplifies the design and increases the reliability. The machine can be operated in independent modules; thus even if one of the sections fails, the rest can operate until the next planned maintenance. Another advantage of the design is the very low superconducting wire requirement; a 10 MW, 10 rpm design is presented which uses 13 km of MgB2 wire at 30 K. The outer diameter of the machine is 6.63 m and it weighs 184 tonnes including the structural mass. The design is thought to be a good candidate for entering the renewable energy market, with its low cost and robust structure.

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Section: Introductionmentioning

confidence: 99%

A modular and cost-effective superconducting generator design for offshore wind turbines

Keysan

Mueller

2015

Supercond. Sci. Technol.

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“…The results of tests on demonstration coils [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] show that the low anisotropy and good potential for operation in a persistent mode open the possibility to apply MgB 2 conductors in magnets for NMR [30,31], MRI [32][33][34][35], superconducting motors [36], superconductor energy storage [37], wind-turbine generators [38][39][40][41][42], magnetic separation and so on.…”

Section: Introductionmentioning

confidence: 99%

Study of the potential of three different MgB₂tapes for application in cylindrical coils operating at 20 K

Pitel

Kòváč

Tropeano

et al. 2015

Supercond. Sci. Technol.

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The goal of this theoretical study is to illustrate the potential of three different MgB2 tapes, developed by Columbus Superconductors, for application in cylindrical coils. First, the distribution of critical currents and electric fields of individual turns is compared when the winding of the model coil is made with tapes having different Ic(B) and anisotropy values. Second, the influence of the winding geometry on basic parameters of cylindrical coils which consist of a set of pancake coils, such as critical current Icmin, central magnetic field B0 and stored energy E, is analysed. The winding geometry of the coils, i.e. the outer winding radius and the coil length, with the same inner winding radius, was changed from a disc shape to a long thin solenoid in such a way that the overall tape length was held constant, and considered as a parameter. Finally, the winding cross-section of the coil is optimized with respect to the constant tape length in order to reach the maximum central field. The results of calculations show that for a given overall tape length and inner winding radius there exists only one winding geometry which generates the maximum central field. The overall tape length, as a parameter, is changed in a broad range from 500 m to 10 km. All calculations were performed using the experimental data measured at 20 K while the effect of the anisotropy in the Ic(B) characteristic of the short samples is taken into account.

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“…Therefore, the cost of the cooling system can be greatly reduced [159]. In addition, a fully-HTS motor provides more compact size and lighter weight compared with a partial-HTS motor at the same power rating.…”

Section: Challenges Of Fully Hts Motorsmentioning

confidence: 99%

AC Loss Reduction in HTS Coils and Armature Windings of Fully Superconducting Motors

You¹

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High AC loss in armature windings is one of the greatest barriers to achieve practical fully-HTS (high-temperature superconducting) motors. At present, AC loss estimation for HTS armature windings is one of the core technical challenges. AC loss behaviours and AC loss reduction methodologies have not been fully investigated in REBCO (REBa2Cu3O7-x, RE: rare earth) HTS armature windings carrying AC current under rotating magnetic fields. Many open questions need to be studied, of which this thesis addresses the three most prominent: can significant AC loss reduction be achieved by using low-loss MFDs (magnetic flux diverters); is it feasible to apply MFD structure to the HTS armature windings; and what kind of REBCO conductor types for armature windings generate less AC loss. The goal of this thesis is applying experimental and numerical methods to investigate AC loss behaviours and AC loss reduction methodologies in the HTS windings wound with REBCO wires. Specifically, it includes investigating AC loss reduction in HTS coil assembly by using low-loss MFDs; building numerical models for fully-HTS motors; and developing methodologies to achieve AC loss reduction in the HTS armature windings. We firstly explored the effectiveness of AC loss reduction on a REBCO four double-pancake coil assembly by using low-loss MFDs, MPP (Molypermalloy powder) MFDs and HF (High flux) MFDs. These have not been studied with HTS coils before. The measured and simulated results show that both MFDs can significantly reduce the total loss (the summation of the losses in the HTS windings and MFDs) in the system. At 77 K and 40 A coil current, compared with the coil assembly without MFDs, the total loss with HF and MPP MFDs is reduced by 77% and 81%, respectively. Although MPP MFDs show slightly better performance in reducing total loss at low coil current, HF MFDs are the more obvious option for AC loss reduction in high magnetic field applications owing to their relatively high saturation field. Next, we developed numerical models to investigate the AC loss reduction in the armature windings of a 50 kW fully HTS motor by applying pole shoes, which function as MFDs. For comparison, two motor designs with and without pole shoes have been considered in the finite-element method (FEM) models. REBCO coated conductors were considered for both the armature and field windings, and 2D FEM models of both designs were built using the T-A formulation (T: current vector potential, A: magnetic vector potential) and rotating meshes. The simulation results show that flux diverting pole shoes reduced the perpendicular magnetic field in the armature windings and provided a 51% AC loss reduction, without weight penalty or motor power rating reduction. Finally, AC loss simulation in HTS armature windings of a 100 kW HTS motor wound with different types of REBCO conductor arrangements were carried out. Three types of conductors, 4 mm-wide REBCO conductors, 14/2 (14 strands, each strand is 2 mm wide) REBCO Roebel cables and striated REBCO conductors with four 1 mm-wide filaments, were considered in the armature windings. The simulation results show that both Roebel cables or striated conductors can significantly reduce the AC loss in the armature windings compared with 4 mm-wide conductors. Further, a 2% AC loss reduction can be achieved in the armature winding wound with REBCO conductors with asymmetric Ic(B, θ) characteristics by simply flipping the direction of the conductors. This work provides a method to achieve large AC loss reduction in HTS coil windings by using low-loss MFDs. Also, it supplies practical implications for designing armature windings of fully-HTS superconducting rotating machines. The methodologies of AC loss reduction in this thesis also can be applied to other HTS applications, such as transformers, and fast ramping magnets.

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Design and Analysis of a New Fully Stator-HTS Motor

Cited by 14 publications

References 17 publications

A modular and cost-effective superconducting generator design for offshore wind turbines

A modular and cost-effective superconducting generator design for offshore wind turbines

Study of the potential of three different MgB₂tapes for application in cylindrical coils operating at 20 K

AC Loss Reduction in HTS Coils and Armature Windings of Fully Superconducting Motors

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Design and Analysis of a New Fully Stator-HTS Motor

Cited by 14 publications

References 17 publications

A modular and cost-effective superconducting generator design for offshore wind turbines

A modular and cost-effective superconducting generator design for offshore wind turbines

Study of the potential of three different MgB2tapes for application in cylindrical coils operating at 20 K

AC Loss Reduction in HTS Coils and Armature Windings of Fully Superconducting Motors

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Study of the potential of three different MgB₂tapes for application in cylindrical coils operating at 20 K