Diodes or capacitors for motor noise reduction

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  • collins class
    SubCommittee Member
    • Dec 2004
    • 128
    #1

    Diodes or capacitors for motor noise reduction

    Technical question for those out there. Which is better for electric motor noise reduction]http://www.tecel.com/d200/noise%20off%20tips.pdf[/url]

    This guy seems to think connecting the positive terminal to the motor casing and using a diode is better based on his testing]http://www.webx.dk/rc/sp540/sp540.htm[/url]

    Any thoughts or comments from the electrical engineers out there?

    Cheers
    Byron
    Tags: None
    • raalst
      Senior Member
      • Feb 2003
      • 1229
      #2
      the capacitors work with any

      the capacitors work with any voltage difference occurring
      between the connectors.
      The diode would require a polarity reversal. i.e,
      minus connector more positive that positive connector.
      What the diode does, is preventing the on-off switching
      of the ESC to cause interference.

      I believe this guy as he seems to have equipment
      that indicates he knows what he is doing.

      This diode works one way, i.e. when the motor is spinning in one direction only.
      What about reverse ? in a plane, reversing is useless, I guess,
      but we have pool walls to fight !
      with the diode setup, reversing would short out your ESC.

      Interesting link anyway.



      Edited By raalst on 1150477320

        Comment

        • carcharadon
          Junior Member
          • Feb 2003
          • 301
          #3
          The diode only affects current

          The diode only affects current direction. A capacitor on the other hand reduces spurious electrical discharges, basically acting as a buffer.

          Back in the old days when there were points for ignition timing (in cars) they always came with a capacitor. The capacitor reduced sparking and this was necessary to reduce noise in the AM radios. I don't think they had FM then or originally.

          The sparking from the points without the capacitor would generate spurious (Sparks), pit the points, and generate radio noise.

          The capacitor is basically a buffer easing the current flow as the brushes, bounce on the contact surfaces and create spurious sparking. This is what causes glitches for RC control with spurious RF signals.


          I suppose a diode couldn't hurt. But its the capicitor that does the real work.

            Comment

            • jmw
              Junior Member
              • Mar 2005
              • 17
              #4
              Capacitors are the way to

              [color=#000000]Capacitors are the way to go, as well as Thick Wires.

              The world of Interference is also called EMC (Electro Magnetic Compatibility). The aim is to cause as little intereference as possible and be disturbed by almost nothing.

              The thing that causes the interference is the loop that the currents are (sometimes forced) to take]

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