Hi Amund, when I was working full time, the products I dealt with had
various motors in them. Both steppers and DC, sometimes both. Most of the
products were in a plastic enclosure. We never had a problem with the
motors causing EMC failures.
We did on the DC motors either put capacitors across them or a snubber
across them, due to the broadband noise they generate.
Jim Bacher, WB8VSU
[email protected]
JBRC Consulting LLC
Product EMC & Regulatory Consultant
https://www.trc.guru/ email:[email protected]
IEEE Life Senior Member
On May 20, 2026 4:00:32 AM [email protected] wrote:
Hi
We are currently evaluating motor options for a small winch application:
12VDC geared motor with PWM control
or a stepper motor solution
Motor power will likely be around 40W.
The product will be EMC tested according to EN IEC 61326-1.
I am primarily interested in practical experience related to radiated
emissions between these two alternatives.
My assumption is that conducted noise can generally be managed with
filtering and ferrites. However, since the enclosure of the final product
provides little or no shielding effect, I am more concerned about radiated
emissions from the motor and driver system itself.
Is it possible to make a general recommendation regarding which motor type
to prefer from an EMC perspective, or does it mainly depend on the EMC
design quality of the motor driver and overall implementation?
BR Amund
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