KTS' rail-side device uses a brushless DC motor/generator to spin up the flywheel to store electrical energy (for instance, from regenerative braking on trains) as kinetic energy; later to be converted back to electrical energy on demand.
Modules are available for brushless permanent magnet motors (BPM), outer rotor BPM motors, induction motors, permanent magnet dc machines, switched reluctance motors, synchronous machines and claw pole machines.
The so-called "Brushless DC electric motors" as used in an increasing array of electronic devices, are actually AC motors.
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