Efficient electric boat

[Jeremy Harris]

Hi,

After some time away from this forum, working on other projects, I've just popped back in.

How can I help with the brushless motor problem?

Jeremy

[hexadrone]

Jeremy waww fantastic thank you for your time

i have one problem with one my brushless





if I touch the area with the red circle in pic ,engine works well, is a behavior very similar to the behavior of the engine that you can see in this movie even if the engines are different:
http://www.youtube.com/watch?v=Qc820DBIYik

Is there a solution? what could be wrong?

Sorry for my bad bad english

thank you for your help.

[Jeremy Harris]

Inside the black sleeve over the three wires from the motor there are soldered joints between the flexible motor leads and the winding wires.

It is likely that one or more of these joints is faulty - it works when you press on it, but not otherwise.

To repair the motor you will need to remove the sleeves on the wires (they are heat shrinkable sleeving), re-solder the joint and then fit new sleeving to insulate the joint.

It is also possible that the more rigid winding wire has broken at this point, perhaps next to the soldered joint. The repair is the same, except you will need to clean off the enamel on the winding wire before making a new soldered joint.

Hope this helps.

Jeremy

[hexadrone]

Originally Posted by Jeremy Harris

Inside the black sleeve over the three wires from the motor there are soldered joints between the flexible motor leads and the winding wires.

It is likely that one or more of these joints is faulty - it works when you press on it, but not otherwise.

To repair the motor you will need to remove the sleeves on the wires (they are heat shrinkable sleeving), re-solder the joint and then fit new sleeving to insulate the joint.

It is also possible that the more rigid winding wire has broken at this point, perhaps next to the soldered joint. The repair is the same, except you will need to clean off the enamel on the winding wire before making a new soldered joint.

Hope this helps.

Jeremy

Dear Jeremy thank you is clear but how to reach the interior of the motor?

[Jeremy Harris]

Originally Posted by hexadrone

Dear Jeremy thank you is clear but how to reach the interior of the motor?

You probably don't need to, as the winding wire to connection lead joint will most probably be outside the motor, under the sleeving.

You have taken the motor apart as far as is possible without damaging the windings. The stator is glued on to the alloy bearing carrier with epoxy resin and the only way that I have found to take them apart is to heat the whole assembly in an oven to around 120 deg C for around an half an hour, to soften the resin, then try and pull the stator and windings off the central alloy bearing carrier.

This almost always damages the windings, so the motor then needs re-winding. It also risks damaging the insulation and bonding between the stator silicon steel laminations, which then leads to a much more complex repair.

Jeremy