Differential Steering Boat

Comments

• ngeneer Posts: 50

  2023-04-30 23:45 edited 2023-05-01 03:59

  Has anyone here "potted" (encased the windings/electronics in epoxy) a motor like the BLDC hoverboard motors?
• MAElektronik Posts: 94

  2023-05-01 16:44

  @ngeneer said:
  Has anyone here "potted" (encased the windings/electronics in epoxy) a motor like the BLDC hoverboard motors?

  Polyurethane is better. I have cast circuit boards inside semi hard Polyurethane used for sub sea trawl sensors.
• JRoark Posts: 1,215

  2023-05-01 19:40

  @MAElektronik said:
  Polyurethane is better. I have cast circuit boards inside semi hard Polyurethane used for sub sea trawl sensors.

  ^^^ this ^^^

  I did the same thing with a camera that spent 5 months at the bottom of a tank of otters. Worked great.
• ngeneer Posts: 50

  2023-05-02 10:57

  @JRoark said:

  @MAElektronik said:
  Polyurethane is better. I have cast circuit boards inside semi hard Polyurethane used for sub sea trawl sensors.

  ^^^ this ^^^

  I did the same thing with a camera that spent 5 months at the bottom of a tank of otters. Worked great.

  perfect tips! thank you!
• macrobeak Posts: 354

  2023-05-04 23:42

  @ngeneer said:
  Has anyone here "potted" (encased the windings/electronics in epoxy) a motor like the BLDC hoverboard motors?

  Hey ngeneer, I have made a few robotic boats where I used submerged hobby BLDC motors directly coupled to propellers.

  The motors run fine below water but need an oil bath when removed.

  I am not sure about long term submergence.
• ngeneer Posts: 50

  2023-05-17 18:14

  @macrobeak said:

  Hey ngeneer, I have made a few robotic boats where I used submerged hobby BLDC motors directly coupled to propellers.

  Thanks! I'd sorta been looking that direction, too. Got some submersible toy-boat ducted-propeller thrusters with the aim to get them going with my own code on the nifty Parallax Universal Motor Controller. Looking at starting them very slowly with high-torque Field Oriented Control (FOC) then transition to just to unidirection (~60 RPM) more energy efficient brushless control. the difficulty arises in that there are no hall, or other, position sensors on those submersible BLDC motors.
• macrobeak Posts: 354

  2023-05-18 00:45

  ngeneer, I just used common hobby ESC (electronic speed control) modules. They are driven by normal hobby RC servo protocol.

  The good ESC modules like EMAX can be programmed for soft start and other features, even bi-directional operation.

  To control the ESC from the propeller microprocessor just use hobby RC servo programs - there are many examples on OBEX.