Elevator traction machine
US4287551A · kind A · utility
8Cited by
3References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 24, 1979 |
| Grant date | Sep 1, 1981 |
| Priority date | — |
| Expiry date | Jul 24, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K11/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.