Braking arrangement for a motor-driven cable reel

Details Braking arrangement for a motor-driven cable reel Braking arrangement for a motor-driven cable reel

1988-06-09

1990-03-20

Ro, Bentsu

Electricity: motive power systems

Braking

Dynamic braking

254222, 318362, H02P 312

Patent

active

049104446

ABSTRACT:
Arrangement for winding of an electric cable which arrangement comprises a rotatable drum from which the cable is arranged to be wound off manually, and an electric motor (M) arranged to be connected to a first circuit for driving the drum in the winding direction and arranged to be rotated by the drum during unwinding of the cable. A second circuit (M,1,3,4) comprises besides the motor (M) also a contact means (1) arranged to be closed when the motor (M) is inoperative. During unwinding of the cable from the drum the motor generates a braking moment which increases with the speed of rotation of the motor.
The second circuit preferably comprises a voltage dependent switch (3), preferably a Zener-diode, which is arranged to be closed when the voltage generated by the motor (M) during the unwinding exceeds a value corresponding to a predetermined speed of rotation of the drum and, as a consequence, of the motor.

REFERENCES:
patent: 2250985 (1941-07-01), Benson
patent: 2973467 (1961-02-01), Choudhury et al.
patent: 3278160 (1966-10-01), Sallow
patent: 3341758 (1967-09-01), Plumpe
patent: 4095151 (1978-06-01), Mourick
patent: 4144482 (1979-03-01), Schwab
patent: 4195255 (1980-03-01), Guttmann
patent: 4200052 (1980-04-01), Cunningham et al.
patent: 4271383 (1981-06-01), Endo
patent: 4556199 (1985-12-01), Dansie et al.
patent: 4751440 (1988-06-01), Dang

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