Machine tools require linear guides with high stiffness and damping at high feed rates. At the same time, a high position accuracy is essential. The linear guides used together with linear direct drives in High Speed Cutting (HSC) Machines have to fulfill these premises along with the necessity to support the high normal forces of a direct drive. Large frictional forces and high wear result fro...

High-temperature superconducting (HTS) magnetic levitation (maglev) trains for designed high speed need a non-contact braking method that can produce stable and sufficient forces to ensure the safety of train during emergency braking. In order study effects permanent magnet eddy current (PMECB) used in HTS maglev vehicles its on performance vehicles, an equivalent two-dimensional simulation mod...

To restrain the effects of vehicle-guideway dynamic interaction, a bandstop filter is introduced into the maglev levitation controller. To compensate these phase-lags in some particular band produced by the bandstop filter, an allpass filter is designed, which can not only attenuate the amplitude at the resonance frequency, but also decrease the phase-lag in relative-wide band. The simulation r...

This paper presents regulation and tracking control design for a magnetic levitation system (Maglev). First, the nonlinear dynamic model of magnetic levitation system was built. Second, a sliding mode control (SMC) is constructed to compensate the uncertainties occurring in the magnetic levitation system. The control gains were generated mainly by experimental method. Next, a composite controll...

This paper describes work on alternative technologies associated with an urban maglev system that employs Halbach arrays of permanent magnets onboard a moving vehicle to induce levitating currents in a stationary “track”. A laminated structure, composed of stacks of thin conducting sheets, has several advantages over a litz-cable ladder as the track. Modeling and experimental results for the la...

This paper presents a structured approach for quantitative risk assessment and subsequent safety analysis of the General Atomics urban maglev system that is under development. This approach, broadly based upon industry standards such as U.S. Military Standard 882C, AREMA Communications & Signals Manual Section 17, and CENELEC Norm EN50129, is applicable to any safety-critical system, and has be...

SWISSMETRO is a MAGLEV Project, designed for a speed up to 500 km/h in two tunnels under partial vacuum. The authors investigate new possibilities to combine the propulsion and levitation. Polarized inductors for the levitation are studied, implying a polarized (permanent magnet) synchronous linear motor. The thermal behavior is investigated using a numerical platform of the complete vehicle-tu...