Following the state of the art, rail-bound vehicles are equipped with three-phase current motors whose acceleration, speed and braking are controlled by means of power electronics. During braking, the kinetic energy of the vehicle is transformed into electrical energy, returned to the grid wherever possible, and thus reused. However, this requires a grid that can take on such energy at any time. Otherwise, the grid voltage would simply rise and the brakes will not work. Another method is to convert the braking energy into heat using a braking resistor.
High Performance axial fan for munting under a subway/underground train.
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