Editing EMI suppression cores
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[[File:Ferrirebeads.jpg|thumb|Snap-on ferrite cores]] | [[File:Ferrirebeads.jpg|thumb|Snap-on ferrite cores]] | ||
[[File:Ferritebead.jpg|thumb|Toroidal ferrite core]] | [[File:Ferritebead.jpg|thumb|Toroidal ferrite core]] | ||
− | EMI suppression cores or ferrite cores are an efficient way to reduce high frequency interference from wiring. Running cables through a ferrite | + | EMI suppression cores or ferrite cores are an efficient way to reduce high frequency interference from wiring. Running cables through a ferrite beads is a recommended solution attempt if signal reliability problems are encountered. |
==Selection== | ==Selection== | ||
For motor control applications it is recommended to get low to medium frequency ferrite cores for maximum efficiency. | For motor control applications it is recommended to get low to medium frequency ferrite cores for maximum efficiency. | ||
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===Application=== | ===Application=== | ||
[[File:Ferrite multiple turns.jpg|thumb|Turning cable 2-3 times through core or using multiple in series increases filtering performance.]] | [[File:Ferrite multiple turns.jpg|thumb|Turning cable 2-3 times through core or using multiple in series increases filtering performance.]] | ||
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Application tips: | Application tips: | ||
− | * | + | *Make 2-3 turns of cable through one core to maximize it's effectiveness |
*Place core close to interference source, not in the middle of the cable | *Place core close to interference source, not in the middle of the cable | ||
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===With servo drives=== | ===With servo drives=== | ||
To solve an EMI problem its good to have selection of cores that can be tried on different cables. Most typical placement for cores: | To solve an EMI problem its good to have selection of cores that can be tried on different cables. Most typical placement for cores: | ||
− | *Motor output cable (all motor wires through core but '''not''' earth conductor) | + | *Motor output cable (all motor wires through core but '''not''' earth conductor) |
*High voltage power supply cable (+ and - leads through core) | *High voltage power supply cable (+ and - leads through core) | ||
− | *USB adapter | + | *USB adapter |
− | * | + | *CMD & control I/O cables |
*Encoder/feedback device cable | *Encoder/feedback device cable | ||
− | + | Note: don't run multiple different type of signals through single core. I.e. don't combine power supply and motor leads in one core. | |
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==See also== | ==See also== | ||
*[[Wikipedia:Ferrite bead]] | *[[Wikipedia:Ferrite bead]] | ||
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