Design and Operating Mode Study of a New Concept Maglev Car Employing Permanent Magnet Electrodynamic Suspension Technology

Abstract

Based on the principle of permanent magnet electrodynamic suspension (PMEDS), a new concept maglev car was designed by using rotary magnetic wheels and a conductor plate. It has the advantages of being high-speed, low-noise, environmentally friendly, safe and efficient. The PMEDS car is designed to use a permanent magnet electrodynamic wheel (EDW) to achieve the integration of levitation force and driving force. The levitation force is generated by the repulsive force of the eddy current magnetic field, and the driving force is generated by the reaction force of magnetic resistance. A simplified electromagnetic force model of the EDW and a dynamics model of the PMEDS car were established to study the operating mode. It shows that the PMEDS car can achieve suspension when the rotational speed of the EDWs reaches a certain threshold and the critical speed of the EDWs is 600 rpm. With the cooperation of four permanent magnet EDWs, the PMEDS car can achieve stable suspension and the maximum suspension height can reach 7.3 mm. The working rotational speed of EDWs is 3500 rpm. At the same time, the movement status of the PMEDS car can be controlled by adjusting the rotational speed of rear EDWs. The functions of propulsion, acceleration, deceleration, and braking are realized and the feasibility of the PMEDS car system is verified.

Yawing stability and manipulative approach design for maglev car based on active disturbance rejection control

“…The concept of maglev car prototypes equipped with EDWs [9][10][11] as a transport vehicle has emerged, but it was all running on a track with constraints. In order to expand the scenario of using maglev car off the track like conventional car, this paper uses four radial EDWs to fabricate a maglev car prototype [12] and let it run unconstrained on a passive conductor plate. As shown in Figure 2a, if the four EDWs rotates at the same speed, the driving force F x1 -F x4 and the levitation force F y1 -F y4 of the four EDWs are theoretically equivalent [13].…”