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This paper presents a thrust ripple reduction method for a double-sided linear switched reluctance motor (LSRM). A structure of motor is back-to-back mover LSRM. The spatial arrangement of the stator is investigated in order to reduce the thrust ripple. The thrust distribution generated by a phase of the LSRM is computed by finite element method (FEM) analysis. Based on numerical results of FEM analysis,...
This paper investigates single-sided ironless linear synchronous motor (ILSM) based on permanent magnet Halbach array used for medium-speed maglev. Long primary ironless coil is laid along the track and the Halbach permanent magnet array is attached to the bottom of each bogie as a source of traction, two dimensional analytical model of single-sided ILSM is established used to calculate the characteristics...
In this paper, the equilibrium orientations of magnetically suspended platforms that are statically loaded and constrained to 2 degrees of freedom are analyzed. It is shown that under these conditions, a symmetric, 2-magnet system can have a maximum of two equilibrium orientations for a given force-moment load. Further, it is shown that these two equilibrium orientations can exist arbitrarily close...
This study addresses magnetic properties of the inverter-fed electrical steel sheet under a wide range of ambient temperatures. We examine the iron loss characteristic under sinusoidal and inverter excitations at room temperature and 300 °C. The iron losses under sinusoidal and inverter excitations decrease with increasing temperatures because the electrical resistivity of electrical steel sheet increases...
This paper reports the experimental results of the load characteristics of a magnetically levitated system with hybrid magnets, which we studied to replace street cars and conveyor systems. The new magnetically levitated system proposed here is low cost, easy to make, and energy saving. This system operates using AA-size dry-cell batteries. The application of pull-up-type magnetically levitated vehicles...
A thrust ripple reduction method for a permanent magnet linear synchronous motor is introduced. The mover consisting of a magnet, a ferromagnetic plate, and a back yoke is divided into three parts in the stacking direction. Each part is spatially displaced in the moving direction. The evaluation coefficient of the harmonic thrust similar to the distribution factor of the winding predicts the amount...
A free-piston engine linear generator (FPEG) system generates electricity using a linear generator when a free piston reciprocates the combustion thrust of the internal combustion. This system is expected to be applied to hybrid vehicles. In this paper, we propose a configuration for an FPEG, and we evaluate its static thrust and magnetic flux density distribution using finite element method (FEM)...
Mechanical circulatory support using rotary ventricular assist devices (VADs) is one of the strongest therapy for heart disease patients. However, technical difficulties such as high mechanical durability, sufficient blood compatibility and small device size prevents VADs development for pediatric heart disease. In this study, an ultra-compact self-bearing motor whose diameter of 22 mm and height...
The idea of considering Maglev systems challenges established ways of thinking on how to deal with an increasing transport demand. Today, the railway industry seems focused on traditional business models that profit from friction, wear and tear of established conventional transport systems. Maglev Systems have begun to challenge those traditional business concepts. Maglev is a fundamentally different...
Subway operators introduced linear metros in 1990s and continued successful urban passenger transport service in many large and dense cities in Japan for more than a quarter century. A significant disadvantage of the linear metros is the relatively low energy efficiency. Therefore, Japan Subway Association (JSA) started a technical challenge to reduce the traction energy consumption of linear metros...
The feasibility of zero-power control in flux-path control magnetic suspension is discussed. In the flux-path control magnetic suspension system, ferromagnetic control plates are inserted between a permanent magnet (magnetic source) and a floator and moved to vary the flux from the magnetic source to the floator. The zero-power control has been applied in active magnetic suspension with a DC electromagnet...
The paper focuses on the potential of the Russian Federation that has been ‘ordained’ by its advantageous location and geographical position to play the role of the international transport transit corridor. To solve this fundamental task the authors suggest creating a unified integral transit transport system. On the basis of optimal transport multimodality and the concept of high-speed trans- and...
This paper presents the development of the single side ironless Halbach permanent magnet linear synchronous motor (PMLSM) for a novel electromagnetic suspension (EMS) maglev vehicle. The basic structure of the propulsion motor and the vehicle are firstly described. Then the thrust and normal force of the ironless PMLSM are analyzed. The configuration of the propulsion system and field oriented control...
This paper describes the prediction and prevention of losing steps in helical teethed linear actuator (HTLA) for artificial muscle. When the rapid external force is applied to the HTLA, it becomes a state of losing steps. Therefore, it is important to predict and prevent this phenomenon. First, we clarified the phenomenon of losing steps in the HTLA by using numerical simulation with 3-D FEM. Next,...
This short report deals with the application of linear machinery in public rail-guided transport. After summarizing advantages and disadvantages of linear motors, several examples of application of linear synchronous/induction motors in railways, including maglev applications[1], are briefly described. Furthermore, the author explains recent efforts for international standardization of linear induction...
When controlling the electromagnetic Suspension system, generally used the displacement sensor. But the Electromagnetic Suspension System using a displacement sensor accuracy of velocity calculation cause problems. This research theme is to solve this issue instead of using force sensor.
We obtain local B-H characteristics on an electrical motor core under inverter excitation by using a 3-D magnetic hysteresis analysis. To obtain the local B-H characteristics leads to iron loss evaluation. In conventional research, a magnetic hysteresis analysis using 3-D model has hardly been performed for evaluation of the magnetic characteristics under inverter excitation. Therefore, this investigation...
In flywheel system, rotor is supported by mechanical bearing. In the cases that the weight of the rotor is heavy and the rotational speed is high, mechanical loss is large. Superconducting magnetic bearing (SMB) is introduced to support with contact-less and control-less. The rotor is supported by the pinning effect in SMB. Pinning force depends on the specification of the HTS. In this paper, the...
Adopting magnetic levitation techniques in Steel Processing Industries is a beneficial way in maintaining the high quality of steel's surfaces. However, the control for levitation and guidance is not so easy, because of difficulties in mechanical and magnetic characteristics of steel, especially in those of thin steel plates. We have already established the stable magnetic levitation and guidance...
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