초록 ▼

A lightweight regenerative brake having a large braking force is provided. A regenerative brake 1 comprises a brake disc (10) and a pair of stators (20) to perform regenerative braking. This regenerative brake (1) reduces the heat generated in the brake disc (10), because a part of the kinetic energ

A lightweight regenerative brake having a large braking force is provided. A regenerative brake 1 comprises a brake disc (10) and a pair of stators (20) to perform regenerative braking. This regenerative brake (1) reduces the heat generated in the brake disc (10), because a part of the kinetic energy of a railway car is regenerated by generation of electricity in a tertiary circuit of the power source side when the brake is applied, and consequently the amount of energy converted into heat energy is decreased. Compared to a conventional regenerative brake, this regenerative brake (1) enables the disc (10) to be made thinner and dispenses with a cooling device such as a fan. Accordingly, a small-sizes and lightweight brake having a large braking force can be constituted using this regenerative brake (1).

대표청구항 ▼

1. 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 co

1. 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. 2. The regenerative brake according to claim 1, wherein the first stator is formed so as to directly oppose one half of the first disc surface of the brake disc, andthe second stator is formed so as to directly oppose one half of the second disc surface of the brake disc. 3. The regenerative brake according to claim 2, wherein the first stator is formed into a first sector extending along a circumference of the brake disc and comprises:a first stator core in which the three or more first coils are provided along an arc of the first sector, and the second stator is formed into a second sector extending along a circumference of the brake disc and comprises; a second stator core in which the three or more second coils are provided along an arc of the second sector. 4. The regenerative brake according to claim 2, wherein the first and second stators comprise respective elongate first and second stator cores which are arranged so that a longitudinal length of the respective first and second stator cores extend parallel to a tangent to a direction of movement of the railway car.5. The regenerative brake according to claim 1, wherein the regenerative brake is supplied for a non-powered railway car to facilitate braking of the non-powered railway car.6. The regenerative brake according to claim 1, wherein the brake disc further comprises:a three-layer structure in which a magnetic core is sandwiched between two aluminum discs; and the control circuit controlling movement of the magnetic field along a circumference of the brake disc at a speed slower than the rotational speed of the brake disc and a speed of movement of the magnetic field being dependent upon the rotational speed of the brake disc. 7. The regenerator brake according to claim 6, wherein the magnetic core is iron.8. The regenerative brake according to claim 6, wherein the magnetic core is steel.9. The regenerative brake according to claim 1, wherein when a slip value of the regenerative brake reaches 1, the regenerative brake fails to apply a braking force.10. The regenerative brake according to claim 1, wherein when a slip value of the regenerative brake ranges from 0 to ?1, the regenerative brake applies a braking force.11. A regenerative brake comprising:a brake disc attached to an axle of a railway car, the brake disc having a first and second opposed surfaces; a first stator having at least three first stator coils located adjacent the first disc surface; a second stator having at least three second stator coils located adjacent the second disc surface; a rotational speed sensor for measuring the rotational speed of the brake disc; a control circuit electrically coupled with the rotational speed sensor; an inverter electrically coupled with the first and second stators and the control circuit, the regenerative brake retards rotation of the brake disc, during operation of the regenerative brake, by exciting the at least three first stator coils and the at least three second stator coils across the brake disc, thereby generating a magnetic field, the control circuit generating the magnetic field and controlling movement of the magnetic field along a circumference of the brake disc at a speed slower than the rotational speed of the brake disc to generate a braking effect on the rotating brake disc with a speed of movement of the magnetic field being dependent upon the rotational speed of the brake disc; and the first stator and the second stator converting kinetic energy of the railway car to electricity which is supplied to the inverter, the inverter converts the electricity to a direct current electricity which is supplied to an electrical system of the railway car. 12. The regenerative brake according to claim 11, wherein the first stator is arcuate in shape and concentric with the first surface of the brake disc and the first stator has a radius similar to a radius of the first disc surface, and the second stator is arcuate in shape and concentric with the second surface of the brake disc and the second stator has a radius similar to a radius of the second disc surface.13. The regenerative brake according to claim 12, wherein the first stator extends circumferentially about the brake disc and has a first stator core in which the at least three first stator coils are provided along an arc thereof; andthe second stator extends circumferentially about the brake disc and has a second stator core in which the at least three second stator coils are provided along an arc thereof. 14. The regenerative brake according to claim 12, wherein the first and second stators comprise respectively elongate first and second stator cores which are arranged so that a longitudinal length of the respective first and second stator cores extend parallel to a tangent to a direction of movement of the railway car.15. The regenerative brake according to claim 11, wherein the regenerative brake is provided on a non-powered railway car to facilitate braking of the non-powered railway car.16. The regenerative brake according to claim 11, wherein the brake disc further comprises a three-layer structure in which a central magnetic core layer is sandwiched between two aluminum disc layers.17. The regenerator brake according to claim 16, wherein the central magnetic core layer comprises iron.18. The regenerative brake according to claim 16, wherein the central magnetic core layer comprises steel.19. The regenerative brake according to claim 11, wherein the regenerative brake does not apply a braking force when a slip value of the regenerative brake is 1 or greater.20. The regenerative brake according to claim 11, wherein regenerative brake applies a braking force when a slip value of the regenerative brake is ranges from 0 to ?1.