Load Test of 3-MW HTS Motor for Ship Propulsion

Yanamoto, Toshiyuki; Izumi, Mitsuru; Umemoto, Katsuya; Oryu, Tamami; Murase, Yohei; Kawamura, M.

doi:10.1109/tasc.2017.2754270

Cited by 47 publications

(19 citation statements)

References 10 publications

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“…The high trapped flux in superconducting stacks can be exploited to enhance the magnetic flux density at the gap of motors and generators, when placing these materials in the rotor [6][7][8]. Other alternatives to achieve the same goal by means of superconductors is to use bulks [9][10][11][12] or pole coils in the rotor [13,14]. Higher gap flux densities enable weigh and size reduction for the same power and torque ratings.…”

Section: Introductionmentioning

confidence: 99%

Cross-field demagnetization of stacks of tapes: 3D modelling and measurements

Kapolka¹,

Pardo

Grilli³

et al. 2019

Supercond. Sci. Technol.

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Stacks of superconducting tapes can trap much higher magnetic fields than conventional magnets. This makes them very promising for motors and generators.However, ripple magnetic fields in these machines present a cross-field component that demagnetizes the stacks. At present, there is no quantitative agreement between measurements and modeling of cross-field demagnetization, mainly due to the need of a 3D model that takes the end effects and real micron-thick superconducting layer into account. This article presents 3D modeling and measurements of cross-field demagnetization in stacks of up to 5 tapes and initial magnetization modeling of stacks of up to 15 tapes. 3D modeling of the cross-field demagnetization explicitly shows that the critical current density, J c , in the direction perpendicular to the tape surface does not play a role in cross-field demagnetization. When taking the measured anisotropic magnetic field dependence of J c into account, 3D calculations agree with measurements with less than 4 % deviation, while the error of 2D modeling is much higher. Then, our 3D numerical methods can realistically predict cross-field demaga This article has been published in Supercond. Sci. Technol. with netization. Due to the force-free configuration of part of the current density, J, in the stack, better agreement with experiments will probably require measuring the J c anisotropy for the whole solid angle range, including J parallel to the magnetic field.the probe is at least 10 mV/T. Cross-field demagnetization consists on the following three main steps: magnetization by field cooling (FC) method, relaxation time and cross-field demagnetization. The detailed process is the following:• The sample is placed into the electromagnet at room temperature.• The electromagnet is ramped up to 1 T.• The sample is cooled down in liquid nitrogen bath at 77 K.• The electromagnet is ramped down with ramp rate 10 mT/s. 400 405 410 415 420 425 B t /B 0 [-] t [s] cal 50 mT cal 100 mT cal 150 mT cal 50 mT n(B,θ) cal 100 mT n(B,θ) cal 150 mT n(B,θ) (b) FIG. 19: (a) The n(B, θ) measured data on a 4 mm wide SuperOx tape, measured in Bratislava by the set-up in [46]. (b) The comparison of calculation with constant n=30 and n(B, θ) dependence, both cases use J c (B, θ) dependence. Using n(B, θ) slightly reduces the demagnetization rate for a few number of cycles, but later on it is increased slightly.

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Section: Introductionmentioning

confidence: 99%

Cross-field demagnetization of stacks of tapes: 3D modelling and measurements

Kapolka¹,

Pardo

Grilli³

et al. 2019

Supercond. Sci. Technol.

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show abstract

“…In these cases, multiphase motors have preference instead of three-phase motor. Among multiphase motors [7][8][9][10], five-phase, double three-phase, twelve-phase and fifteen-phase are normal choices according to application and power level [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Multiphase PMSM with Asymmetric Windings for Electric Drive

Cui

Zhao

et al. 2020

Energies

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Multiphase permanent magnet synchronous motors (PMSM) are widely utilized in high power and high reliability electric propulsion systems. In electric propulsion systems, the motor may work at a low efficiency area for a long time, which increases energy consumption and reduces cruise range. In order to improve motor efficiency, this paper proposes a multiphase motor structure. The stator winding of proposed motor consists of three independent windings that have different rated speed and torque. In this paper, winding match mode, operation characteristic and efficiency characteristic are analyzed, and a torque distribution strategy with optimal efficiency is given. The results show that in propeller load such as electric aircrafts and ships, the proposed motor can reduce motor total loss and temperature rise in a drive cycle, which improves system efficiency, reliability and fault tolerance performance.

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“…In their motor, the HTS windings are cooled with circulating liquid nitrogen. The Kawasaki Heavy Industries group (Japan) has successfully completed development of a 3 MW class ship propulsion motor, in which the HTS field windings are cooled by circulating helium gas [5]. In addition, the Doosan Heavy Industries & Construction group (Korea) has been developing a MW class ship propulsion motor using rare-earth barium copper oxide (REBCO) tapes [6].…”

Section: Introductionmentioning

confidence: 99%

Multidisciplinary analysis of the transient performance of a 20 kW class HTS induction/synchronous motor cooled with a cryocooler and gaseous air-gap coolant

2019

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This paper presents a multidisciplinary analysis procedure for the transient cooling and rotating characteristics of a 20 kW class high temperature superconducting (HTS) induction/synchronous motor, this analysis couples the nonlinear voltage equations, equation of motion, and a thermal equivalent circuit. First, the quantitative accuracy of the thermal equivalent circuit is validated through comparison with results obtained using the 3D finite element analysis. Then, multidisciplinary analysis is performed with the assumption that the outer surface of the stator is cooled by a cryocooler and the air-gap between the stator and rotor is cooled by a gaseous coolant.It is demonstrated that the transient performance of the motor can be fully determined using our developed procedure. For instance, we can determine the gas-flow speed in the air-gap required for cooling of the HTS rotor, by assuming appropriate expressions for the heat transfer in the air-gap.The analysis procedure and obtained results are effective for investigation of the variable speed performance of an HTS motor system and for optimal design of the motor cooling structure and method.

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Load Test of 3-MW HTS Motor for Ship Propulsion

Cited by 47 publications

References 10 publications

Cross-field demagnetization of stacks of tapes: 3D modelling and measurements

Cross-field demagnetization of stacks of tapes: 3D modelling and measurements

Multiphase PMSM with Asymmetric Windings for Electric Drive

Multidisciplinary analysis of the transient performance of a 20 kW class HTS induction/synchronous motor cooled with a cryocooler and gaseous air-gap coolant

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Load Test of 3-MW HTS Motor for Ship Propulsion

Cited by 47 publications

References 10 publications

Cross-field demagnetization of stacks of tapes: 3D modelling and measurements

Cross-field demagnetization of stacks of tapes: 3D modelling and measurements

Multiphase PMSM with Asymmetric Windings for Electric Drive

Multidisciplinary analysis of the transient performance of a 20 kW class HTS induction/synchronous motor cooled with a cryocooler and gaseous air-gap coolant

Contact Info

Product

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Multidisciplinary analysis of the transient performance of a 20 kW class HTS induction/synchronous motor cooled with a cryocooler and gaseous air-gap coolant