Transportation apparatus

Details Transportation apparatus Transportation apparatus

1987-05-29

1988-01-05

Ro, Bentsu

Electricity: motive power systems

Braking

188171, 198854, B60T 1304, H02P 304

Patent

active

047178655

ABSTRACT:
Transportation apparatus, such as escalators and moving walks, having an electrically released, magnetically set brake, and a servo loop for regulating the brake coil current. Brake voltage and brake current feedback are both used in the regulation of the brake current, with the values of the voltage and current feedback being selected to cause electromagnetic flux produced by the brake coil current to substantially cancel the magnetic flux produced by permanent magnets over the operating temperature range of the brake. In a preferred embodiment of the invention, the brake current is pulsed continuously while the transportation apparatus is operated, to prevent transient excursions of the brake current from initiating and maintaining partial setting of the brake.

REFERENCES:
patent: 3416053 (1968-12-01), Inba et al.
patent: 4231452 (1980-11-01), Kraft
patent: 4588065 (1986-05-01), Maiden et al.
patent: 4600865 (1986-07-01), Caputo

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