New Style HXT / TURNIGY Exposed

[dontsendbubbamail]

The front bearings are shielded. Rear outer bearing is sealed while the inner one is shielded. Magnets are glued in with lots of glue. Windings are tight. My impression is that that the quality has improved some. The front screws, sides side screws, and rear screws were loose. Every motor (3) that I have gotten from HobbyKing had loose screws.

This motor had become hard to spin with your hand. I thought that it might have been shorted windings, but they all read the same on the 1X scale of my analog multimeter. Getting the shaft out destroyed the rear bearings and the shaft. It may have been the fact that I was liquored up when I tried to remove the shaft. I will replace the rear bearings, replace the shaft and try it again.

My thinking is that I will switch the motor to wye for my tandem build. There is lots of room to tease the wires apart and lots of room for hall effects.

Bubba

[recumpence]

Wow, it actually has a skirt bearing? That is fantastic! Previously only the Plettenberg motors used skirt bearings around the rotating can.

Looks good to me!

Matt

[dontsendbubbamail]

I just noticed that the front has three bearings. Two on the shaft that are the same size as the two on the rear and one large one for the bell.

Bubba

[12p3phPMDC]

Those slim large diameter skirt bearings aren't cheap either..
Turnigy/HXT/whatever must have bought a boat load of them.

[liveforphysics]

Whoa! Big changes!

This also means they can easily be sealed up now if an application chooses to cool them through conduction with the front of the stator in mounting.

That bell skirt has gotta enable much better dimensional stability in high G situations, much like a bike bumping down a road. That means much much tighter magnet air gaps are possible, which will enable further reductions in KV and increased torque for a given physical size of the motor.

Regarding the setscrews, I think they leave them loose so people don't strip them when they go to take them apart. I think pretty much anyone who is going to be mounting them on a plane or heli is going to need to take the motor apart to get things setup.

Remember, when you go to set the screws, drill a dimple in the shaft where the screw will set. Flat-spotting the shaft is crap that gets done in mass production stuff. Dimples are 10000000 times better.

[northernmike]

Luke man, you really DO live-for-physics.

I'm glad your brain is here.

Thanks!

[liveforphysics]

Luke man, you really DO live-for-physics.

I'm glad your brain is here.

Thanks!

Thank's for the kind words Mike

It seems they show no price increase, but the photo clearly shows the updated skirt bearing design. Good deal for us!

http://www.hobbycity.com/hobbycity/stor ... (eq:_70-55)

Can you confirm that the photo you're showing is the product that I linked above?

[liveforphysics]

looks like the baby motors got skirt bearings too! Cool!

http://www.hobbycity.com/hobbycity/stor ... (Eq._52-20)

[dontsendbubbamail]

Remember, when you go to set the screws, drill a dimple in the shaft where the screw will set. Flat-spotting the shaft is crap that gets done in mass production stuff. Dimples are 10000000 times better.

I am a believer in dimples. Flats were used on my 1st and 2nd builds. All but one slipped.

My pictures are of the hxt 80-83. When I ordered this motor, HobbyKing showed and still shows the old picture.

Bubba