Elevator speed control system
US4027745A · kind A · utility
8Cited by
4References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 11, 1975 |
| Grant date | Jun 7, 1977 |
| Priority date | — |
| Expiry date | Aug 11, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P7/347
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric generator energizes a driving motor for an elevator car. In order to control the generator field, a control circuit compares a command speed signal with a sensed speed signal of the elevator car and applies the result of the comparison to the field through a filter of electrically higher order operative to cancel out a resonance and an antiresonance frequency of a mechanical system formed of the elevator car and associated mechanical components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.