Small brushless and sealing of 2 mm shaft

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  • DrSchmidt
    Rear Admiral
    • Apr 2014
    • 1026

    Small brushless and sealing of 2 mm shaft

    I'm thinking about the WTC for my U1. There's space for a 6 cm (2,5 inch) diameter WTC. So I need either a single motor with a gear or two small motors. Looking at latter I found these brushless motors:



    22 mm diameter and sufficient power for a boat. Does anyone have experiences using these kind of little brushless motors? I'm also open to suggestions for brushed motors at that size that are suitable for boats.

    The challenge here are the 2 mm diameter drive shafts. Standard axial seals start at 3 mm diameter. Any idea how to get those watertight?
    Last edited by DrSchmidt; 06-22-2024, 04:27 AM.
  • TuptubBuilder
    Lieutenant, Junior Grade
    • Sep 2020
    • 39

    #2
    I use solid couplings like Uxcell. They can be found on amazon. The 2 mm - 3 mm are 20 mm long so you need some room. Also, i am by far no expert, but the KV value of the motor seems too high since KV times volts equals RPM.

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    • He Who Shall Not Be Named
      Moderator
      • Aug 2008
      • 12508

      #3
      Originally posted by DrSchmidt
      I'm thinking about the WTC for my U1. There's space for a 6 cm (2,5 inch) diameter WTC. So I need either a single motor with a gear or two small motors. Looking at latter I found these brushless motors:



      22 mm diameter and sufficient power for a boat. Does anyone have experiences using these kind of little brushless motors? I'm also open to suggestions for brushed motors at that size that are suitable for boats.

      The challenge here are the 2 mm diameter drive shafts. Standard axial seals start at 3 mm diameter. Any idea how to get those watertight?
      Yeah. I got some experience with these little brushless motors!

      Here are some thought starters for you in picture form.

      To adapt a non-standard output shaft diameter to a commercially available seal either machine the shaft down to fit or install an adapter to up-size the motors output shaft to suit the seal.

      Most of the examples shown fit a 2.5-inch diameter cylinder.

      I have tooling for the motor-bulkhead and other stuff. Interested?














































      David
      Who is John Galt?

      Comment

      • Subculture
        Admiral
        • Feb 2009
        • 2169

        #4
        Very small shafts tend to be sealed with o-rings and a custom-built gland.

        Seen articles on smaller shaft seals e.g. https://www.gallagherseals.com/blog/...rization-trend

        I don't know if they've made it into production.

        Comment

        • DrSchmidt
          Rear Admiral
          • Apr 2014
          • 1026

          #5
          Originally posted by Subculture
          Very small shafts tend to be sealed with o-rings and a custom-built gland.

          Seen articles on smaller shaft seals e.g. https://www.gallagherseals.com/blog/...rization-trend

          I don't know if they've made it into production.
          Ha, I found the Freudenberger Micro Simmering yesterday, too....

          Comment

          • redboat219
            Admiral
            • Dec 2008
            • 2885

            #6
            Make it simple, make strong, make it work!

            Comment

            • ffr2608
              Commander
              • Oct 2009
              • 280

              #7
              Nice find and I love how they but up to the motor can like that.
              DH

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