Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1985-10-30
1987-01-06
Dobeck, B.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318345C, 318375, H02P 516
Patent
active
046349421
ABSTRACT:
Apparatus for controlling d-c shunt motors of electric cars utilizes first chopper circuits connected in series with the armatures of the d-c motors for controlling armature currents upon receipt of a first set of control signals and second chopper circuits connected in series with the field windings of the d-c shunt motors for controlling the field currents responsive to a second set of control signals, reactors having first and second coils, the first coils being connected in series with the armatures and the second coils being connected in series with the field windings, with the first and second coils magnetically coupled together to maintain a relationship that the field currents decrease with a decrease in the armature currents.
REFERENCES:
patent: 4322667 (1982-03-01), Ohba
"Automatic Variable-Field Chopper-Control Equipment for Teito Rapid Transit Authority's Yurakucho Line", M. Ashiya et al., Mitsubishi Electric Engineer, June 1974, pp. 36-42.
"New Standard Thyristor Chopper Controlled Cars with Regenerative Braking", esp. p. 33, section 5.3, Mutually Coupled Main Smoothing Reactors, T. Kitaoka et al., Mitsubishi Denki Engineer, Mar. 1972, pp. 28-35.
Dobeck B.
Mitsubishi Denki & Kabushiki Kaisha
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