Patent ID: 6897576

Claim:
A regenerative brake comprising: a brake disc attached to an axle of a railway car, comprising a first disc surface; a second disc surface; a first stator comprising three or more first stator coils directly opposing the first disc surface; a second stator comprising three or more second stator coils directly opposing the second disc surface; a rotation speed sensor for measuring a rotational speed of the brake disc; an inverter; and a control circuit; wherein the regenerative brake opposes rotation of the brake disc by exciting the three or more first stator coils and the three or more second stator coils across the brake disc, thereby generating a moving magnetic field, the rotation speed sensor measures the rotational speed of the brake disc; the control circuit causes the generated moving magnetic field to move at a slower speed than the rotational speed of the brake disc; a portion of kinetic energy, resulting from motion of the railway car, is converted to electricity by the first stator and the second stator; the electricity generated by the first and second stators is supplied to the inverter; the inverter converts the electricity into direct-current electricity; and the direct-current electricity is supplied to an electrical system for the railway car.