Transportation apparatus

Details Transportation apparatus Transportation apparatus

1984-10-29

1986-07-15

Shoop, Jr., William M.

Electricity: motive power systems

Plural diverse motor controls

Motor braking

318 63, 318 86, 198321, H02P 304

Patent

active

046008659

ABSTRACT:
Transportation apparatus, such as escalators and moving walks, having controlled stopping characteristics. Deceleration is directly regulated via a deceleration servo loop which provides a current reference signal for an inner current loop. Brake current limiting prior to the controlled stop, as well as mechanically limiting the maximum brake gap, results in faster transient response, and a more linear braking torque versus brake current characteristics. Multiple drive units operate from a common deceleration reference signal, while having independent servo loops each operating from a "local" deceleration signal.

REFERENCES:
patent: 3707220 (1972-12-01), Boltrek et al.
patent: 3860860 (1975-01-01), Moran et al.
patent: 4056759 (1977-11-01), Mitsui et al.
patent: 4139810 (1979-02-01), Ueki et al.
patent: 4276500 (1981-06-01), Sumka et al.
patent: 4493398 (1985-01-01), Kindler
Western Electric Technical Digest, "Clutch-Brake Speed Control", No. 41, pp. 7-8, Jan. 1976.

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