Study on electromagnetic force characteristics acting on levitation/guidance coils of a superconducting Maglev vehicle system

Yonezu, Takenori; Watanabe, Ken; Suzuki, E.; Sasakawa, T.

doi:10.1109/intmag.2017.8007869

Cited by 4 publications

(7 citation statements)

References 1 publication

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“…This section describes the fundamental theory of electromagnetic force and vehicle dynamics characteristics with regard to magnetic springs for guidance. Figure 2 is a schematic drawing of the superconducting coil and levitation/guidance coil arrangement and definition of the axes [4]. Four superconducting coils are arranged on one side of the bogie, as shown in Fig.…”

Section: Fundamental Theory Of Magnetic Springs For Guidancementioning

confidence: 99%

“…Figure 3 shows the calculation results of the balanced displacement. The gap is set to 185 mm, 175 mm, and 160 mm [3] [4]. The magnetomotive force of the SCM is set to 580 kA -700 kA.…”

Section: Balanced Displacementmentioning

confidence: 99%

“…Therefore, this factor is related to the decrease of the current which flows in the lower half of the levitation/guidance coil. In addition, the most dominant components [4] for the electromagnetic force for the guidance, the lower lateral straight components of superconducting coil and the lower lateral straight components of the lower half of the levitation/guidance coil move farther. By the reasons described above, the factor of the change in the vertical direction has an effect of the decrease of kyy.…”

Section: Equivalent Lateral and Equivalent Rolling Spring Constantsmentioning

confidence: 99%

“…In terms of fundamental research, the effect of changing certain design parameters, such as the gap and magnetomotive force of the SCM, on electromagnetic force characteristics has been studied [3] [4].…”

Section: Introductionmentioning

confidence: 99%

“…Studies described in previous papers [3] [4], or in this paper, do not deal with all of the design parameters and assessment factors mentioned above, rather, they deal with the design parameters or the assessment factors related to electromagnetic force and vehicle dynamics characteristics.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

<b>Characteristics of Magnetic Springs for Guidance of Superconducting Maglev Vehicles</b>

et al. 2018

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The lateral and rolling components of the magnetic springs of superconducting Maglev vehicles are strongly coupled, and their characteristics are barometers to decide the takeoff velocity of the vehicle. In order to design Maglev vehicles effectively, it is important to understand the principles to be applied to determine the spring specifications with respect to the design parameters: the gap and the magnetomotive force of the superconducting magnet. In this paper, a study using computer simulations on the effect of changing the design parameters is described, referring to the principles of electrodynamic suspension and the vehicle dynamics of Maglev vehicles.

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Section: Fundamental Theory Of Magnetic Springs For Guidancementioning

confidence: 99%

“…Figure 3 shows the calculation results of the balanced displacement. The gap is set to 185 mm, 175 mm, and 160 mm [3] [4]. The magnetomotive force of the SCM is set to 580 kA -700 kA.…”

Section: Balanced Displacementmentioning

confidence: 99%

Section: Equivalent Lateral and Equivalent Rolling Spring Constantsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

<b>Characteristics of Magnetic Springs for Guidance of Superconducting Maglev Vehicles</b>

et al. 2018

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Improvement of Damping Factor by Optimal Shape and Installation Position of the Damper Coils at Low Velocity Range in Electrodynamic Suspension System

Yamamoto

Betsunoh

Ohashi

2022

J. Phys.: Conf. Ser.

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The electrodynamic suspension system (EDS) realizes stable levitation without the gap control. One of its application is JR Maglev. The EDS system has basically no damping factor against the disturbance. The damping factor is improved by installing the additional coil. However, the damping factor is needed especially at the low velocity. The normal operation velocity in the JR Maglev is the velocity vx = 120[m/sec]. The optimal shape and installation position of the damper coils at the low velocity range such as vx < 80[m/sec] is discussed. The type of the damper coil system and the velocity do not affect the optimal height of the coil. The optimal width of the damper coil in the semi-active system is 8.9% smaller than that in the passive one. The optimal installation position is higher at the low velocity than that at the normal operation velocity in both damper system type. By this optimization, the vertical oscillation is up to 13.6% smaller and the pitching oscillation is up to 11.0% smaller.

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Experimental Verification of Passive Axial Electrodynamic Suspension in a Bearingless Motor

Rubio

KOMAL

Fujii

et al. 2023

IEEE Open J. Ind. Applicat.

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This article investigates a bearingless motor with passive electrodynamic axial suspension. The axial suspension force is generated by a specific coil configuration called a figure-eight coil. Radial directions and tilting angles are stabilized by passive permanent magnet bearings. Since axial electrodynamic force increases with rotational speed, it must overcome a certain minimum threshold speed to compensate for the rotor weight and the unstable axial force caused by the permanent magnet bearing. Theoretical equations are derived for the braking torque caused by the suspension current and for the steady-state axial equilibrium position at constant rotational speed. A method based on the braking torque equation is proposed for correcting the mismatch between the magnetic center of the bearingless motor and the middle point of the axial clearance. This method sets the middle point between upper and lower touchdown positions in the same place where the motor current is minimum during passive axial suspension. Axial suspension is confirmed in the experiment with a noncontact laser sensor.

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Study on electromagnetic force characteristics acting on levitation/guidance coils of a superconducting Maglev vehicle system

Cited by 4 publications

References 1 publication

<b>Characteristics of Magnetic Springs for Guidance of Superconducting Maglev Vehicles</b>

<b>Characteristics of Magnetic Springs for Guidance of Superconducting Maglev Vehicles</b>

Improvement of Damping Factor by Optimal Shape and Installation Position of the Damper Coils at Low Velocity Range in Electrodynamic Suspension System

Experimental Verification of Passive Axial Electrodynamic Suspension in a Bearingless Motor

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