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LUO Cheng, ZHANG Kun-lun, JING Yong-zhi. Vertical stability of permanent magnet EDS system with novel Halbach array[J]. Journal of Traffic and Transportation Engineering, 2019, 19(2): 101-109. doi: 10.19818/j.cnki.1671-1637.2019.02.010
Citation: LUO Cheng, ZHANG Kun-lun, JING Yong-zhi. Vertical stability of permanent magnet EDS system with novel Halbach array[J]. Journal of Traffic and Transportation Engineering, 2019, 19(2): 101-109. doi: 10.19818/j.cnki.1671-1637.2019.02.010
shu

Vertical stability of permanent magnet EDS system with novel Halbach array

doi: 10.19818/j.cnki.1671-1637.2019.02.010
  • 1.

    School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • 2.

    Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

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    Abstract
  • For the vertical dynamic stability problem of permanent magnet electrodynamic suspension (EDS) system, the critical stable characteristic of permanent magnet EDS system was analyzed. A novel Halbach array mixed with permanent magnets and normal conductor coils was proposed. The active control on permanent magnet EDS system damping was realized by winding active normal conductor coils on the permanent magnet surface. The novel Halbach array was compared with the other two active electromagnetic damping control schemes. The vertical dynamic model of permanent magnet EDS system with novel Halbach array was established, and the suspension controller was designed by adopting the classical PID closed-loop control method. The system vertical dynamic stability was simulated and analyzed under the conditions without external disturbance, with external disturbing force and with track irregularity disturbance, respectively. Research result shows that under the action of disturbing force, the permanent magnet EDS system will oscillate with a constant amplitude, can not suspend stably and even may crash the track under the action of continuous disturbing force. The proposed novel Halbach array has the advantages of convenient coupling calculation in magnetic field and wide force adjustment range. The designed suspension controller can make the system suspend stably at the equilibrium position with a rated air gap of 0.03 m. The coils current is 0, and no loss is generated. The relative errors of suspension air gap and coils current between the simulation results and theoretical analysis results are less than 0.01%. When there exists a track irregularity disturbance, the system can suspend quickly and stably at the equilibrium position with a rated air gap of 0.03 m, and the stable coils current is still 0. Therefore, a zero-power balance of permanent magnet EDS system is realized. When the external disturbing force is ±1 500 N, the system can suspend quickly and stably at the equilibrium position with a rated air gap of 0.03 m, and the stable coils current is 29.68 and-30.40 A, respectively, proving that the permanent magnet EDS system with novel Halbach array can realize the vertical dynamic stability.

     

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