High-acceleration linear motors are difficult to design for a number of reasons. They require large amounts of energy in very short periods of time. One rocket launcher design calls for 300 GJ for each launch in the space of less than a second. Normal electrical generators are not designed for this kind of load, but short-term electrical energy storage methods can be used. Capacitors are bulky and expensive but can supply large amounts of energy quickly. Homopolar generators can be used to convert the kinetic energy of a flywheel into electric energy very rapidly. High-acceleration linear motors also require very strong magnetic fields; in fact, the magnetic fields are often too strong to permit the use of superconductors. However, with careful design, this need not be a major problem.
high-acceleration linear motors are difficult to design for a number of reasons they require large amounts of energy in very short periods of time one rocket launcher design calls for 300 gj for each launch in the space of less than a second normal electrical generators are not designed for this kind of load but short-term electrical energy storage methods can be used capacitors are bulky and expensive but can supply large amounts of energy quickly homopolar generators can be used to convert the kinetic energy of a flywheel into electric energy very rapidly high-acceleration linear motors also require very strong magnetic fields; in fact the magnetic fields are often too strong to permit the use of superconductors however with careful design this need not be a major problem