Comparison of Force Density of Various Superconducting Linear Motor Types Considering Numerically Evaluated AC Losses

Bruyn, B.J.H. de; Jansen, J.W.; Lomonova, E. A.

doi:10.1109/tasc.2016.2539543

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…In actuators, this enables a higher force density, making them interesting for application in e.g. photolithography machines [3], where a reticle has to be accelerated in rapid repetition [4]. In this particular application, ReBCO stator coils experience a time-varying, non-sinusoidal magnetic field from the moving armature, which has an orderof-magnitude amplitude and frequency of 100 mT and 10 Hz, with higher-order harmonics.…”

Section: Introductionmentioning

confidence: 99%

Effect of a DC transport current on the AC loss in no-insulation ReBCO racetrack coils exposed to AC parallel magnetic field at 77 K and 4.2 K

Harmsel

Otten

Dhallé

et al. 2023

Supercond. Sci. Technol.

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ReBCO coils are developed as DC field coils in linear motor systems to increase the force density, in favor of permanent magnets. Such coils have to sustain a relatively large heat load stemming from the AC magnetic field environment in which they operate. The use of no or partial turn-to-turn insulation can make them more stable against the effects of local heating. Conversely, the radial electrical connections in no-insulation coils allow for large coupling currents, causing additional AC loss on top of the already significant heat load. Here we report on the AC loss in sub-scale no-insulation, 4 mm wide single-tape, ReBCO racetrack coils exposed to parallel-to-the-tape magnetic field in the frequency range of 10-4 to 1 Hz at 77 K and 4.2 K, while carrying a DC transport current. AC loss is measured magnetically and electrically. The main goal of these experiments is to validate our 2D numerical model, which provides more insight into the origin of the AC loss. At low frequencies, inter-turn coupling currents are spread more or less homogeneously throughout the winding pack. Whereas at high frequencies, the skin effect causes shielding of the interior of the coil and large induced currents only occupy the coil's outer surface.

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Section: Introductionmentioning

confidence: 99%

Effect of a DC transport current on the AC loss in no-insulation ReBCO racetrack coils exposed to AC parallel magnetic field at 77 K and 4.2 K

Harmsel

Otten

Dhallé

et al. 2023

Supercond. Sci. Technol.

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“…As for the rotary motor, the linear motor also has a considerable range of types that differ both in the principle of operation and from the construction point of view [4]: there are synchronous motors, indicated with the abbreviation LSM; induction (LIM); and transverse flow or longitudinal flow. According to the geometrical aspects, they are distinguished by the length of the fixed and movable parts, and they also can be single-or double-sided according to whether the structure embraces one or two sides of the machine.…”

Section: Introductionmentioning

confidence: 99%

Design and Modeling of a Robust Sensorless Control System for a Linear Permanent Magnet Synchronous Motor

et al. 2021

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The paper is concerned with designing an effective controller for a linear tubular homopolar (LT-H) motor type. The construction and operation of the LT-H motor are first described in detail. Then, the motor model is represented in the direct-quadrature (d-q) axes in order to facilitate the design of the control loops. The designed control system consists of two main loops: the current control loop and velocity adaptation loop. The determination of the regulator’s gains is accomplished through deriving and analyzing the transfer functions of the loops. To enhance the system’s robustness, a robust variable estimator is designed to observe the velocity and stator resistance. Different performance evaluation tests are performed using MATLAB/Simulink software to validate the controller’s robustness for variable-speed operation and load force changes as well. The obtained results reveal the appropriate dynamics of the motor thanks to the well-designed control system.

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“…Superconducting coils have many applications such as motors for electric aircrafts and ships, transformers, superconducting power storage systems, etc. [1][2][3]. It is possible to obtain large capacity and high efficiency driving with a considerable reduction in size and weight of coils because of the large current application by the superconducting technology.…”

Section: Introductionmentioning

confidence: 99%

Discrimination of Partial Discharges in Gaseous and Liquid Nitrogen by Using Waveform Characteristics

Yamada

Kawashima

Obana

et al. 2020

Plasma and Fusion Research

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The cryogenic coolant is important as an electrical insulation in an immersion cooling. One of the dielectric breakdown mechanisms of the cryogenic coolant is via bubbles, caused by partial discharge (PD). The insulation performance has been discussed with PD parameters and breakdown voltage. However, the essential PD mechanism has not been clarified in detail. In this paper, PDs in gaseous and liquid nitrogen were discriminated based on characteristics of the original PD waveform. It was shown that the difference in charge behavior appears significantly in the fall time of the original PD waveform.

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Comparison of Force Density of Various Superconducting Linear Motor Types Considering Numerically Evaluated AC Losses

Cited by 9 publications

References 9 publications

Effect of a DC transport current on the AC loss in no-insulation ReBCO racetrack coils exposed to AC parallel magnetic field at 77 K and 4.2 K

Effect of a DC transport current on the AC loss in no-insulation ReBCO racetrack coils exposed to AC parallel magnetic field at 77 K and 4.2 K

Design and Modeling of a Robust Sensorless Control System for a Linear Permanent Magnet Synchronous Motor

Discrimination of Partial Discharges in Gaseous and Liquid Nitrogen by Using Waveform Characteristics

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