Research Article
The Innovative Design of Deep In Situ Pressure Retained Coring Based on Magnetic Field Trigger Controller
Table 2
Maximum magnetic force of the valve cover when the valve seat consists of four identical shape tile magnets in six schemes.
| Distance (mm) | Maximum magnetic force (N) | Scheme 4 | Scheme 5 | Scheme 6 | Scheme 7 | Scheme 8 | Scheme 9 |
| 1 | 265.098 | 344.533 | 169.530 | 171.384 | 190.576 | 236.777 | 5 | 64.168 | 111.624 | 52.093 | 53.455 | 67.263 | 97.531 | 10 | 16.374 | 37.288 | 16.272 | 17.915 | 27.857 | 46.035 | 15 | 6.575 | 14.886 | 6.697 | 7.862 | 13.646 | 24.548 | 20 | 3.369 | 6.221 | 3.027 | 3.873 | 7.242 | 13.931 | 25 | 2.174 | 2.749 | 1.534 | 2.120 | 4.042 | 8.028 | 30 | 1.552 | 1.247 | 0.843 | 1.238 | 2.287 | 4.806 | 35 | 1.151 | 0.586 | 0.512 | 0.771 | 1.350 | 2.915 |
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