Abstract
This paper proposes a novel guidance magnet with 7 magnet poles for application in high speed maglev train. Its configuration and working principle are introduced in detail. Mathematical models of the guidance force and moment are established accurately by equivalent magnetic circuit method (EMCM), from which the relationships of guidance force - control current - guidance gap and moment - current change - angular deflection are derived. Finite element method (FEM) is also applied to analyze the performances and characteristics of the novel guidance magnet. The analysis results are in good agreement with those calculated by EMCM, which is helpful in designing, optimizing and controlling the guidance system. The comparisons are carried out between the novel and conventional guidance magnets. The contrast results indicate that the proposed novel guidance magnet possesses better performances compared to the conventional structure, especially the superior guidance capability and lower power loss. Finally, the relationship of guidance force-control current under the nominal guidance gap is validated by a test bench for magnet performance.
Highlights
Nowadays magnetic suspension technology is widely employed in various fields of high speed rotating and linear motions due to its advantages of no friction, micro vibration, high precision and long service life
The levitation and guidance magnets are applied in maglev train which has been researched for a long time and realized commercial operation in many countries such as China, Japan, South Korea and so on [4]–[6]
In this paper, a novel guidance magnet applied in high speed maglev train is proposed, whose performances are analyzed in detail and compared with the conventional one
Summary
Nowadays magnetic suspension technology is widely employed in various fields of high speed rotating and linear motions due to its advantages of no friction, micro vibration, high precision and long service life. Considering the high speed operation, a 6 poles guidance magnet are applied in TR08 as well as levitation magnet and the corresponding control systems are decoupling through the flexible mechanical connection [12]–[14]. In contrast to the passive guidance structure in middle-low speed maglev train, the active control system and the independent guidance magnet possess a better response performance and higher guidance capability [15]–[17]. The application of the 6 poles guidance magnet shown in Fig. 1 ensures the stable operation for high speed maglev train, it increases the overall weight and power loss at the same time. The magnet yokes are the primary loaded components transferring the magnetic force in the guidance magnet They participate in the magnetic circuits together with iron core of magnet pole and guidance plate. The ferromagnetic materials are regarded as linear, of which the magnetic saturation is not taken into consideration
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