Hysteresis and reluctance electric machines with bulk HTS rotor elements

Kovalev, L.K.; Ilushin, K.V.; Koneev, S.M.A.; Kovalev, Konstantin; Penkin, V.T.; Poltavets, V. N.; Gawalek, W.; Habisreuther, T.; Oswald, B.; Best, K.-J.

doi:10.1109/77.783530

Cited by 57 publications

(28 citation statements)

References 2 publications

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“…is the magnetic vector potential in the i-th hole region which is given by (9). The boundary condition at r = R 3 is given by: …”

Section: General Solution Of Laplace's Equation In the Air-gap Sub-domentioning

confidence: 99%

“…Among them, Superconducting Synchronous Reluctance Motors (ScSynRM) are studied and tested by different authors as, Chu and Torii [5], Kovalev et al [9], Malé et al [12], and Oswald et al [14].…”

Section: Introductionmentioning

confidence: 99%

“…Compared to [9] and [14], the proposed motor uses superconducting materials for both the stator and the rotor. Fig.…”

Section: Introductionmentioning

confidence: 99%

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Analytical calculation of the flux density distribution in a superconducting reluctance machine with HTS bulks rotor

Male

Lubin

Mezani

et al. 2013

Mathematics and Computers in Simulation

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This paper deals with the analytical computation of the magnetic field distribution in a wholly superconducting reluctance motor. The rotor is made with high temperature superconductor bulks which nearly present a diamagnetic behavior under zero-field cooling. The stator consists of superconducting armature windings fed by AC currents of high amplitude. The superconducting stator winding can generate a high rotating magnetic field without the need of ferromagnetic material in the rotor. The electromagnetic torque is obtained by the interaction between the rotating magnetic field created by the superconducting stator windings and the variable reluctance due to the superconducting bulks. The proposed analytical method is based on the resolution of Laplace's equation (by the separation of variables method) for each sub-domain, i.e. rotor shaft, holes between superconducting bulks and air-gap. The global solution is obtained using boundary and continuity conditions. Magnetic field distribution and electromagnetic torque obtained by the analytical method are compared with those obtained from finite element analyses.

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“…is the magnetic vector potential in the i-th hole region which is given by (9). The boundary condition at r = R 3 is given by: …”

Section: General Solution Of Laplace's Equation In the Air-gap Sub-domentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analytical calculation of the flux density distribution in a superconducting reluctance machine with HTS bulks rotor

Male

Lubin

Mezani

et al. 2013

Mathematics and Computers in Simulation

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“…Each of the related effects leads to a motor family. Reluctance motors [2], hysteresis motors [3] and trapped flux motors [4], being hysteresis class asynchronous, and reluctance and trapped field classes synchronous. Due to the high field which can be trapped in the superconducting pellets, it is expected that YBCO pellets can substitute permanent magnets with advantage, but the behavior is not the same, good permanent magnets maintain their magnetization but superconducting pellets maintain the magnetic flux trapped.…”

Section: Introductionmentioning

confidence: 99%

AC Three-Phase Axial Flux Motor With Magnetized Superconductors

López

Lloberas²,

Maynou³

et al. 2007

IEEE Trans. Appl. Supercond.

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One of the most relevant topics in the development of trapped field superconducting motors is the requirement of a magnetization process of the superconducting pellets, previously to start operating the superconducting machine. This work deals with magnetization of an axially excited superconducting motor. We consider two ways to magnetize the eight YBCO bulks included in an eight poles disk shaped rotor: the so called Field Cooling (FC) and the Zero Field Cooling (ZFC) processes. Discussion of both procedures is reported in terms of the behaviour of the motor after magnetization is done. Measurement system and data concerning torque and load angle are also reported.

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“…, is a suitable material for cryomagnetic applications as magnetic bearings [1] and motors [2]. The performance of this material depends on the critical current density and the maximum diameter of the current loops.…”

Section: Introductionmentioning

confidence: 99%

Magnetic characterization of welded YBaCuO-bulk samples

Zeisberger

Habisreuther

Litzkendorf

et al. 2005

IEEE Trans. Appl. Supercond.

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The welding of individually grown pieces of high temperature superconductor bulk material is the most promising way to obtain larger single domain tiles which are required for cryomagnetic applications. In this paper we present a method for the characterization of this kind of material. The method is based on the inductive measurement of the total current in ring samples using a Rogowski coil and an integrator circuit. The advantage of this technique is that it allows a direct measurement of the current crossing the artificial grain boundary without being influenced by the intergrain current and is independent of the sample size and geometry. We present the principle of the measurement and the calibrations of the system. The independence of the output signal on intragrain currents is demonstrated. The application of the method for the characterization of a welded sample is shown.

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Hysteresis and reluctance electric machines with bulk HTS rotor elements

Cited by 57 publications

References 2 publications

Analytical calculation of the flux density distribution in a superconducting reluctance machine with HTS bulks rotor

Analytical calculation of the flux density distribution in a superconducting reluctance machine with HTS bulks rotor

AC Three-Phase Axial Flux Motor With Magnetized Superconductors

Magnetic characterization of welded YBaCuO-bulk samples

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