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How To Prevent Electrical Noise From A Motor?

Discussion in 'Sensors and Actuators' started by Mastermind, Aug 30, 2011.

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  1. Mastermind

    Mastermind

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    Jul 29, 2011
  2. shrtrnd

    shrtrnd

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    Jan 15, 2010
    We need a little more information.
    Is this noise because the motor is vibrating? Should you use rubber isolators?
    Is the noise inside the motor? Do you have bad bearings?
    Is the noise mechanical or electrical?
    Is the noise electrical because you're overloading it?
    Is the noise mechanical because you're overloading it?
    Is the noise electrical because you're overvoltage/overcurrent?
    Somebody here can help if you help us understand.
     
  3. poor mystic

    poor mystic

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    Apr 8, 2011
    I think it might be worth trying to mount caps as you wish, and see if the noise goes away. But our friend shrtrnd has asked good questions because there are lots of kinds of noise.
    So, I'll ask my questions: what kind of noise is causing you trouble, and how is it causing the trouble, please?
     
    Last edited: Aug 30, 2011
  4. Mastermind

    Mastermind

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    Jul 29, 2011
    I meant noise that interferes with my signals, not actual noise.
     
  5. poor mystic

    poor mystic

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    Apr 8, 2011
    Would you mind telling us a bit about your signals please?
     
  6. shrtrnd

    shrtrnd

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    Jan 15, 2010
    Ohhhh.
    Radio Shack and Olsen used to sell these things cheap before the improvements in
    vehicle electronics. All I remember about them was they were tuned to the basic
    frequency of the vehicle's electrical system. I don't know if this is a home project,
    or if you have a commercially built system. If it's commercially built, the manufacturer
    would know what to recommend to overcome this problem.
    It's been twenty years since I worked on this type of a problem, and can't think of a
    recommendation off the top of my head.
    I'll give it some thought, and repost if I remember what I did in the past.
    What you might consider, is what signals the motor noise is interferring with.
    Multiple pieces of equipment, or just one.
    You can limit the noise from the motor. Or I think I would be more concerned with
    filtering the input power to your equipment you're picking the noise up on.
    (Unless this motor noise is actually so bad it's being picked-up on some type of
    audio gear through it's signal input wires or antenna).
    Have you isolated the antenna or input signal from the chassis the motor is connected
    to?
    How sensitive is the equipment? Is this a radio transmitter/receiver, or audio device
    of some type?
    Do you think the noise is coming-in through the actual power wiring, or is it induced
    through the air from the motor due to motor proximity to your electronics?
    It's easier to attack the problem, when we know the source transmission medium.
     
  7. Mastermind

    Mastermind

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    0
    Jul 29, 2011
    I am using an rf modem (transmitter) to transmit serial data back to my pc (receiver). Dc motors are known to have current spikes which can produce some unwanted "noise" that can interfere with the signal. I read that you can use one or two capacitors to filter and prevent this. I am using two. I am just wondering if I could connect the capacitors on the wires as close to the motors as possible, would that same effect as connecting the capacitors to the terminals (I cannot do this because the terminals are inside the motors and there are only two wires coming out). Here's what I am talking about. http://www.beam-wiki.org/wiki/Reducing_Motor_Noise
     
    Last edited: Aug 31, 2011
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