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.
Highlights
According to the suspension mechanism, the maglev scheme is divided into a high temperature superconducting (HTS) maglev, electromagnetic suspension (EMS) and electrodynamic suspension (EDS)
In order to make full use of the advantages of permanent magnet electrodynamic suspension (PMEDS), we introduced the PMEDS technology into the automobile structural system, designed a new concept maglev car structure based on the radial Halbach permanent magnet array, and fabricated the principal prototype
To provide electromagnetic force input for dynamic simulation to accurately analyze the dynamic response of the PMEDS system, it is necessary to transform the interaction relationship between the electrodynamic wheels (EDW) and the conductor plate and establish a simplified electromagnetic force model
Summary
According to the suspension mechanism, the maglev scheme is divided into a high temperature superconducting (HTS) maglev, electromagnetic suspension (EMS) and electrodynamic suspension (EDS). T. Lipo et al [32,34] proposed a horizontal permanent magnet wheel structure where a radial Halbach permanent magnet array mechanically rotates above a non-magnetic conductive track to form a time-varying magnetic field, which interacts with the track to induce levitation and propulsion force at the same time. Lipo et al [32,34] proposed a horizontal permanent magnet wheel structure where a radial Halbach permanent magnet array mechanically rotates above a non-magnetic conductive track to form a time-varying magnetic field, which interacts with the track to induce levitation and propulsion force at the same time This structure can be used to build a relatively inexpensive form of maglev transportation because the track does not require electrical installation, and the levitation and propulsion force will be generated by a single mechanism. The simulation results provide a groundbreaking exploration for the application of new concepts of maglev transportation
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