d of a LSM can be altered in two main ways:1. by varying the frequency of the three phase currents 2. by varying the number of wires per unit length in the stator and rotor. DiscussionLSM's, like LIM's, have the ability to move the rotor relative to the stator without any physical contact. This drastically reduces mechanical wear.LSM's do NOT have the ability to accelerate the rotor from rest up to the speed of a quickly moving magnetic field. This means that Maglev trains that use LSM must either make the synchronous speed start very slowly and increase slowly or use a secondary propulsion system for acceleration.A general-looking setup for a LSM.from Linear Motion Electromagnetic Systems, page 26. The Final Analysis The AdvantagesEnergy EfficiencyThe basic physics of magnetic lift and electrical propulsion are the essentials behind Maglev's energy efficiency. For example, Maglev consumes per trip about one seventh of the energy used by a Boeing 737-300 for a 125-620 mile trip. In addition, Maglev operation is not dependent upon petroleum for its energy; the electrical power can be derived from other sources. The energy efficiency is due to the mechanical efficiency resulting from drastically reduced friction and less enegry lost as heat in the operation of the vehicle. Speed High speed is an inherent characteristic of maglev. Because the operation of the vehicle occurs without physical contact, high speeds are within technological limits. Speeds up to 500 miles per hour are possible, with top speeds usually limited not by physical constraints, but rather by economic considerations. Commercial rail today usually travels at only 200 miles per hour, while Maglev promises at minimum a 300 mile per hour top speed. For short trips, Maglev is competitive with short airplane flights of up to 500 miles! Freight Transport Maglev could be used to effect a fully automated transport system, with goods arriving within seconds of their scheduled tim...
