Elevator traction machine

Details Elevator traction machine Elevator traction machine

1979-07-24

1981-09-01

Spar, Robert J.

Electricity: electrical systems and devices

Discharging or preventing accumulation of electric charge

307145, 187 1R, H02H 100

Patent

active

042875510

ABSTRACT:
An elevator traction machine including a main rope, a traction sheave, a DC motor controlled by a thyristor Leonard system, a brake wheel, bearings of motor shaft and a machine beam.
The motor shaft is grounded through first grounding circuit including a current collector for the shaft current induced by the switching operation of the thyristor, and through second grounding circuit including the bearings. The second grounding circuit includes a resistor to substantially prevent the flow of the shaft current through the bearings and to protect the bearings from the electrolytic corrosion.

REFERENCES:
patent: 1490271 (1924-04-01), Hecht, Jr.
patent: 3317759 (1967-05-01), Grobel
patent: 3873886 (1975-03-01), Kato et al.

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