Braking system for electric railcars including means for control

Details Braking system for electric railcars including means for control Braking system for electric railcars including means for control

1989-07-13

1991-10-29

Shoop, Jr., William M.

Electricity: motive power systems

Braking

318371, H02P 300

Patent

active

050618830

ABSTRACT:
A braking system for an electric railcar having an a.c. motor with a variable voltage variable frequency inverter. The inverter controls the voltage and frequency supplied to the a.c. motor in response to the railcar speed, commands from the cab, load conditions, etc. The braking system also includes a pneumatic brake which operates at low speeds. A control circuit operates the inverter to supply electric braking down to a slow speed and then simultaneously applies electric braking and pneumatic braking, smoothly increasing the pneumatic braking force until the railcar stops. During the transistion from electric braking to pneumatic braking the control circuit maintains an output frequency from the inverter to the a.c. motor in the vicinity of 0 Hz, keeping the voltages in the positive phase range.

REFERENCES:
patent: 3334287 (1967-08-01), Jensen
patent: 3621729 (1971-11-01), Oberthur
patent: 3774095 (1973-11-01), Coccia
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patent: 4225813 (1980-09-01), Sahasrabudhe
patent: 4340131 (1982-07-01), Eriksson
patent: 4417288 (1983-11-01), Hattori et al.
patent: 4651071 (1987-03-01), Imanaka
patent: 4659970 (1987-04-01), Melocik
patent: 4779260 (1988-10-01), Kaneko et al.
"Japanese National Symposium Theses Utilizing Cybernetics for Railways", Feb. 1988, pp. 347-351.

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