Elevator car position detection sensor that determines a phase of an alternating-current voltage corresponding to a frequency of an excitation magnetic field
US11472665B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 2017 |
| Grant date | Oct 18, 2022 |
| Priority date | — |
| Expiry date | Jul 10, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2017/9527
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
To provide an elevator car position detection sensor capable of suppressing erroneous detection of presence or absence of a plate. The elevator car position detection sensor includes a first coil provided to one of an elevator car and a hoistway and configured to output an excitation magnetic field to a plate provided to the other of the elevator car and the hoistway; a second coil provided on an opposite side of the first coil relative to the plate; a shield wall configured to shield an end portion of the plate located closer to one of the car and the hoistway; and a determination circuit configured to determine a phase of an alternating-current voltage corresponding to a frequency of the excitation magnetic field output from the first coil at an alternating-current voltage generated across the second coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.