Cecil,
Ken is right, it could be a host of problems. Have you check the setup for
ground loops? The way you describe it, I suspect you are using a single
pair of power/ground plane on a multilayer board that did not isolate your
motor-driver-power/ground from your control electronics ground.
Check your grounding scheme for common impedance coupling.
Tim Foo
Ken Javor
<ken.javor@emccomplian To:
<cecil.gitt...@kodak.com>, <emc-p...@majordomo.ieee.org>
ce.com> cc: (bcc: Wan Juang
Foo/ece/staff/npnet)
Sent by: Subject: Re: Motor Noise
owner-emc-pstc@majordo
mo.ieee.org
12/14/01 05:20 AM
Please respond to Ken
Javor
Ken Javor <ken.ja...@emccompliance.com>
12/14/01 05:20 AM
Not enough info for me to weigh in with any kind of certainty. I do know
from personal experience that if you use solid state switches to control
motor operation by applying a pulse train (PWM) rather than continuous
voltage control that will generate big spikes as the inductance of the
motor opposes the current change inherent in the pulse rise-time. This is
mitigated by slowing the rise-times sufficiently that the L di/dt product
is manageable.
cecil.gitt...@kodak.com
12/13/01 10:04 PM
From: Cecil A. Gittens
All ...... specifically Senior EMC Team Members.
I am having a problem on the power control board, in the motor control
ckt. when we turn the motors on.
This condition creates significant noise spike on my entire ground plane,
along with the other power ckts, this needs to be cleaned up for signal
integrity issues, even more then EMC reasons at this time.
Anyone can feel free to stop in and give me some ideas.
Best regards,
Cecil
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