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Old 5th November 2007, 04:14 PM   #1
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Join Date: Dec 2003
Location: Toronto Canada
Default toroid near a computer motherboard.

I am building a CNC controller for my mill, i have scrounged up a nice aluminium 2u server which has a lot of extra space to put the interface board, gecko drivers, relays and power supply.

I am planning to keep the small microatx p4 motherboard in there, it has a printer port which i need for the mach3 software.

anyways the corner of the motherboard farthest away from the CPU would be quite close (about an inch or 2 ) to the 320VA toroid i am using to drive my servos.

would the toroid introduce enough hum into the PCs circuitry to make it unreliable or crash? or should it be ok if i put a shield between them.

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Old 5th November 2007, 04:43 PM   #2
Minion is offline Minion  Canada
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Join Date: May 2006
Location: Cowican Bay , vancouver island
If you are Concerned about Hum maybe try a Mumetal Can or Shield for the Toroid to block the Magnetic Field.....
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Old 5th November 2007, 05:13 PM   #3
Pan is offline Pan  Sweden
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Mount the PCB and toroid so that the hole in the toroid is facing the most sensitive parts.

Maximum radiation is in the plane of the toroid if you think of the toroid as a disc.

In the 90 degree axis (imagine a line straight thru the hole in the toroid) the radiation cancels almost completely due to the way a magnetic field is radiated from a wire and the way a toroid is winded on the core.

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Old 6th November 2007, 02:11 AM   #4
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Location: Toronto Canada
I cant really do that the case is 2u and the toroid is about 7" in diameter (its a low profile 320VA)

however today i rearranged the computer PSU and the toroid can be about 4" away from the motherboard. ill just put a shield between them and see how it goes.
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