Grounding motor can

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  • jdbostrom
    Junior Member
    • Mar 2005
    • 135
    #1

    Grounding motor can

    Awhile back I read on some website (can't remember what website it was, but it was an R/C submarine site) that the capacitors on the motor will have no effect unless a wire is soldered from the motor can to the negative terminal on the battery. Now that was the only place I have ever heard that, but I don't want to discount it because for all I know it might be true. Can someone either confirm or deny this?

    Thanks,
    Jonathan
    Tags: None
    • chuck chesney
      Junior Member
      • Mar 2005
      • 176
      #2
      Hi Jon,
      I think that I

      Hi Jon,
      I think that I may have heard something similar a long time ago. I've never done it, and have never had any problems. The caps on the motors are to absorb and eliminate the voltage spike caused by the collapse of the wound fields on the armature as it spins and the sparking at the commutator/brushs.
      Don't worry about it in day to day operation.

        Comment

        • don prince
          SubCommittee Member
          • Feb 2003
          • 201
          #3
          Hi Jonathan,

          I found this information

          Hi Jonathan,

          I found this information at http://adamone.rchomepage.com/guide5.htm

          Sparks that occur between the brushes and the commutator can cause radio interference. In order to prevent radio interference it is recommended the use of ceramic capacitors soldered between each motor terminal and the motor case. For extra security against interference, a third capacitor should also be fitted between the motor terminals.

          Note: many Graupner Speed xxx motors have the first 2 of these capacitors already fitted internally.

          Me again... I believe the key here is the potential difference is between the commutator and the brushes. The capacitors act as a shunt to prevent this from happening, thus eliminating the RFI... This is my best educated guess! I've never thought much about the need for the extra grounding wire in all the computer/printer based motors in my 42 years at NCR. However, all of the A/C motors had a ground wire for safety...

          Regards,
          Don_
          A man's gotta know his limitations...
          Harry Callahan, SFPD

            Comment

            • jdbostrom
              Junior Member
              • Mar 2005
              • 135
              #4
              Thanks guys. I think I

              Thanks guys. I think I will forget about it. The extra wire gets in the way anyway.

                Comment

                • ramius-ii
                  Junior Member
                  • Apr 2003
                  • 393
                  #5
                  Hi Guys]http://www.subcommittee.com/forum/icon_smile.gif
                  See if

                  Hi Guys]http://www.subcommittee.com/forum/icon_smile.gif[/img]
                  See if this supports a better understanding]http://www.subcommittee.com/forum/icon_cool.gif[/img]

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