the width of the magnet assembly the coils and the magnet assembly are aligned lengthwise and arranged so that a constant number of coils is cut by magnetic flux lines at any given time the coils comprise wire wound a predetermined number of turns the number of turns in a coil is inversely proportional to the speed the train is expected to travel at that point on the track and directly proportional to the force required to propel the train at that point on the track application_number US 22442994 A description the propulsion power in a maglev train is the product of the total force in the direction of the motion of the train and the velocity of the train the total power from the propulsion system needed to move the train is the sum of the acceleration power levitation loss power super conducting shield loss power wind drag power and power transfer drag local coil control manages the turn on magnitude wave shape and polarity control of each coil inverter in managing local coil control two aspects must be considered first the voltage across the coils is proportional to speed second the current in the coils is proportional to force magnetic field sensors in the guideway sense the approaching train and initiate the waveform power generation control cycle fig1 shows a simplified view of a maglev train 10 using a linear electric motor 12 discontinuous rotor magnetic field for propulsion and power the depicted motor 12 includes and active guideway 14 with a drive coil assembly 20 having a plurality of coils 22 shown in more detail in fig5 and 6 that are placed at intervals along guideway 14 a linear motor with.