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High Speed Ground Transport: Overview of The Technologies
Published in Thomas Lynch, High Speed Rail in the U.S. Super Trains for the Millennium, 2020
Maglev vehicles require a non-contact means of propulsion and braking which is compatible with the operating clearance of the magnetic suspension. The EDS Linear Express uses an air-cored linear synchronous motor (LSM). Three-phase excitation of armature coils produces a magnetic wave into which an array of on-board superconductive magnets is locked. This same magnet array is used for levitation and guidance. The speed of the magnetic wave is determined by armature input frequency, providing precise speed control of the vehicle with high power factor-efficiency operation. As the vehicle moves along the guideway, successive coil groups are powered up and the vacated sections are shut down. The EMS Transrapid system uses an iron-cored linear synchronous motor, using the suspension electromagnets for excitation. The principle and mode of operation is the same as for the Linear Express vehicle. A major advantage of the LSM is that propulsion power is not transferred to the vehicle and processed on board—the guideway armature is the high power component of the motor. Hotel power can be transferred to the vehicle by non-contact transformer effect, with on-board batteries for back-up purposes.
Principles of Energy Conversion
Published in Hamid A. Toliyat, Gerald B. Kliman, Handbook of Electric Motors, 2018
Hamid A. Toliyat, Gerald B. Kliman
Linear electric motors can drive a linear motion load without intermediate gears, screws or crank shafts. A linear synchronous motor (LSM) is a linear motor in which the mechanical motion is in synchronism with the magnetic field, i.e., the mechanical speed is the same as the speed of the travelling magnetic field. The thrust (propulsion force) can be generated as an action of Traveling magnetic field produced by an alternating current (ac) polyphase winding and an array of magnetic poles N,S,…,N,S or a variable reluctance ferromagnetic rail;Magnetic field produced by electronically switched direct current (dc) windings and an array of magnetic poles N,S,…,N,S or variable reluctance ferromagnetic rail (linear stepping or switched reluctance motors).
Linear Electric Motors
Published in Leonard L. Grigsby, and Distribution: The Electric Power Engineering Handbook, 2018
An LSM is a linear motor in which the mechanical motion is in synchronism with the magnetic field, i.e., the mechanical speed is the same as the speed of the traveling magnetic field. The thrust (propulsion force) can be generated as an action of
Design and Analysis of a New Improved Force Linear Switched Reluctance Motor for Transit Application
Published in IETE Journal of Research, 2022
Nisha Prasad, Shailendra Jain, Sushma Gupta
Recent technological developments and environmental challenges have stimulated the quest for better transportation systems. Linear motor-powered transport systems have gained popularity due to the inherent structural advantages of using linear motors over rotary motors for their propulsion [1,2]. In such systems, linear motors not only generate the required propulsion force for propelling the vehicle but also provide necessary braking force for the vehicle. Therefore, these systems require high-performance motors. Linear Induction Motor (LIM) and Linear Synchronous Motor (LSM) are most widely used motors in such transport systems. However, due to its cost-effectiveness and simplicity, the Linear Switched Reluctance Motor (LSRM) has been widely researched to establish this motor as an alternative to these motors. This motor is not only robust but also has high fault tolerance capability [1–4].
Estimation of direct energy consumption and CO2 emission by high speed rail, transrapid maglev and hyperloop passenger transport systems
Published in International Journal of Sustainable Transportation, 2021
Short- and/or long-stator Linear Synchronous Motors (LSMs) or the rotating motors constitute the propulsion system of TRM system. In general, the LSM consists of two components: i) the stator underside of the guideway, producing a magnetic field along the guideway; and ii) the excitation system onboard the train, which stimulates the levitation electromagnets to produce an excitation magnetic field. After synchronizing and locking both magnetic fields, the generated propulsion force pulls forward and thrusts the train. At the same time, the induced magnetic resistance force opposes this propulsion force. Some estimates indicate that the resulting minimum mechanical power has been around 8 MW (Cassat & Bourquin, 2011).