During a magnetic levitation car as JR maglev train is accelerated or decelerated at low speed, there arises a requirement for a special energy supply and storage system for supplying electric power to auxiliaries inside the trains as cryogenic refrigerator, air conditioners, and lights, for short time about one minute.
Here in this paper, many energy systems, as hydrogen engines, fuel cells, hydrogen batteries, flywheel, etc. are studied and compared to each other as candidates for this internal energy supply system of JR-maglev train.
For comparison, many view points as weight, size, energy density, recharge ability, reliability, and emissions, etc. were picked up and each system was studied and discussed from these view points, and compared to each other.
For conclusion, several systems including Ni-Cd battery, hydrogen battery, metal hydride fuel cell, flywheel, hydrogen engine, and others were selected as best candidates.