Detection coil, detection apparatus, and detection system
US11796709B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2020 |
| Grant date | Oct 24, 2023 |
| Priority date | — |
| Expiry date | Mar 24, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F38/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A detection coil includes a first group of coils, a second group of coils, and a third group of coils that are continuously wound and coaxial, and the second group of coils is located between the first group of coils and the third group of coils. A coil that generates the first magnetic field is coaxial with the first group of coils, the second group of coils, and the third group of coils. A sum of the induced electromotive forces of the first group of coils, the second group of coils, and the third group of coils is zero. When a metal foreign matter exists, a sum of the induced electromotive forces of the first group of coils, the second group of coils, and the third group of coils is not zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.