Editing EMI suppression cores
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− | [[File:Ferrirebeads.jpg|thumb|Snap-on ferrite | + | [[File:Ferrirebeads.jpg|thumb|Snap-on ferrite beads]] |
− | [[File:Ferritebead.jpg|thumb|Toroidal ferrite | + | [[File:Ferritebead.jpg|thumb|Toroidal ferrite bead]] |
− | EMI suppression cores | + | EMI suppression cores a.k.a. '''ferrite beads''' are an efficient way to reduce high frequency interference from wiring. Adding ferrite beads to signal & power wiring is recommended if signal reliability problems are encountered. |
==Selection== | ==Selection== | ||
− | For motor control applications it is recommended to get low to medium frequency ferrite | + | For motor control applications it is recommended to get low to medium frequency ferrite beads for maximum efficiency. |
;Preferred types | ;Preferred types | ||
*Core material designed for low to medium frequency bands (attenuation between 1-300 MHz) | *Core material designed for low to medium frequency bands (attenuation between 1-300 MHz) | ||
*Large enough to fit cable multiple rounds through it | *Large enough to fit cable multiple rounds through it | ||
− | ;Avoid | + | ;Avoid, might make things worse |
*Core material designed for high frequency bands (above 300 MHz) | *Core material designed for high frequency bands (above 300 MHz) | ||
*Inductor cores | *Inductor cores | ||
*Iron powder cores | *Iron powder cores | ||
− | + | Warning: most ferrite & iron powder cores look same. So if unsure about material properties, its most safe bet to purchase low to medium frequency beads | |
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==Where to find suitable cores== | ==Where to find suitable cores== | ||
− | Ferrite | + | Ferrite beads are available from most electronic part distributors such as: |
*Digikey | *Digikey | ||
*Mouser | *Mouser | ||
*Farnell | *Farnell | ||
− | Some popular ferrite | + | Some popular ferrite bead brands: |
* Laird-Signal Integrity Products | * Laird-Signal Integrity Products | ||
* Fair-Rite | * Fair-Rite | ||
− | ==Usage | + | ==Usage with VSD-E/XE drives== |
− | + | To solve an EMI problem its good to have selection of beads that can be tried on different cables. Most typical placement for beads: | |
− | + | *USB adapter | |
− | + | *CMD cable | |
− | + | *Encoder cable | |
− | + | *Motor output cable (all motor wires through core, multiple turns) | |
− | + | *HV DC power supply cable (+ and - leads through core, multiple turns) | |
− | + | Note: don't run multiple cables through one bead. | |
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− | To solve an EMI problem its good to have selection of | + | |
− | *Motor output cable (all motor wires through core | + | |
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==See also== | ==See also== | ||
*[[Wikipedia:Ferrite bead]] | *[[Wikipedia:Ferrite bead]] | ||
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