Control device for lifting magnet
US10974933B2 · kind B2 · utility
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3References
6Claims
0Family size
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Key dates
| Filing date | Jun 16, 2017 |
| Grant date | Apr 13, 2021 |
| Priority date | — |
| Expiry date | Feb 1, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C2700/087
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
When at least one of a value a detected output current to a magnet and a magnet load defined by the following formula is equal to or larger than a threshold value predetermined for the value of the detected output current or a threshold value predetermined for the magnet load, a controller constituting a control device outputs, to a control circuit, a command to decrease voltage applied to the magnet from next attracting operation. Magnet load=excitation ratio×I×V . . . ; wherein excitation ratio: excitation time/(excitation time+non-excitation time); I: value of the output current; V: voltage applied to a lifting magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.