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A REGENERATIVE BRAKING SYSTEM FOR D.C. RAILWAY TRACTION

J.M.W. Whiting

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Abstract

A regenerative braking system using a chopper-controlled d.c. series motor is described. A feature of the system is the automatic change from a weak-field to a full-field mode of operation as the speed falls. Sudden changes in line voltage can be accommodated with some of the flexibility of a separately-excited motor scheme, but at less cost. A second chopper circuit controls the effective resistance of a braking rheostat so that regenerative and rheostatic braking can be blended and the greatest possible energy savings can be made, within the limits imposed by the receptivity of the traction supply system.

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What this paper is about

A regenerative braking system using a chopper-controlled d.c. series motor is described. A feature of the system is the automatic change from a weak-field to a full-field mode of operation as the speed falls. Sudden changes in line voltage can be accommodated with some of the flexibility of a separately-excited motor scheme, but at less cost. A second chopper circuit controls the effective resistance of a braking rheostat so that regenerative and rheostatic braking can be blended and the greatest possible energy savings can be made, within the limits imposed by the receptivity of the traction supply system.

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Available abstract

A regenerative braking system using a chopper-controlled d.c. series motor is described. A feature of the system is the automatic change from a weak-field to a full-field mode of operation as the speed falls. Sudden changes in line voltage can be accommodated with some of the flexibility of a separately-excited motor scheme, but at less cost. A second chopper circuit controls the effective resistance of a braking rheostat so that regenerative and rheostatic braking can be blended and the greatest possible energy savings can be made, within the limits imposed by the receptivity of the traction supply system.

Key concepts: Regenerative brake, Chopper, Braking chopper, Traction motor, Automotive engineering, Traction (geology), Engineering, Electrical engineering

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