CD rom motor probs

[TeamSME]

I've built about 10 cd rom motors that run great... But lately, ive had 2 motors that will not run right at all. Im using the gbv motor kits. They always catch at about 1/4 throttle and stall, I can slowly move it to full throttle but I need these motors for 3D. I'm about to go insane, nothing works, I tried increasing my wind count to decrease rpm and give me some more torque: still catches, built another motor with clean winds and great mag spacing: still catches, Rewound the motor twice: Still catches, tried different batteries 2s/3s: still catches, ground the stator as a last resort. IT STILL FREAKING CATCHES!

What the heck is going on here

BTW I'm running 16 turns 26awg, and an 8x4.3 gws orange

[ImaBiggles]

I've built about 10 cd rom motors that run great... But lately, ive had 2 motors that will not run right at all. Im using the gbv motor kits. They always catch at about 1/4 throttle and stall, I can slowly move it to full throttle but I need these motors for 3D. I'm about to go insane, nothing works, I tried increasing my wind count to decrease rpm and give me some more torque: still catches, built another motor with clean winds and great mag spacing: still catches, Rewound the motor twice: Still catches, tried different batteries 2s/3s: still catches, ground the stator as a last resort. IT STILL FREAKING CATCHES!

What the heck is going on here

BTW I'm running 16 turns 26awg, and an 8x4.3 gws orange

are u using the stock sleave bearing or the upgraded bearings? What I believe is happening is that the can is being pulled away from the stator, going into a bit of a wobble and binding or shorting. A 8X4.3 is a very large prop for a 16 turn motor. You are pulling >10 amps on 3S, which is about 40 watts higher than recommended on a GBv.

Or, your batteries can be hitting LVC - monitor you voltage under motor load.

Or your amps could be spiking and hitting limit of esc, monitor amps under load.

also, pull the can off and look at the top (facing can) windings to make sure none of them rubbed against the can.

[ecologito]

Check all the hints that ImaBiggles wrote about, also by checking your amp draw might find if you are reaching your battery dicharge limit. When you go full power in a bit, the amp draw might be to high for your batteries and that is why whenn you power it up slowly you don't reach the discharge limit of your batteries ( quick discharge, the ESC will shut down if the batteries can't supply the power).

Good luck.

[Doc.heckle]

You need 20turns for an 8x4.3

[fly_boy99]

If you go back and do a post mortem did you wind each phase with the same number of turns....

Will get you everytime....

[olmod]

glue a spare magnet onto a pop stick and pass over the magnets ,every other should attract.

[TeamSME]

Polarity is right, it doesnt over amp and shut off, it catches, I'm running 730s and 480s, got a response from steve at slofly, gonna try more turns for more torque. I remember the ls would wig out if you over propped so I'm gonna rewind with 18 turns in wye

Also I have it setup with the shaft pushed a bit more in to ensure both bearings are being utilized

Me and my friend shockyjocky17(tom), both ran 17's and got insane performance with the 2 cell 800 range.


Thanks for the help

Sean

[lensrc]

Try a smaller prop, or a direct drive prop. I would guess it is over-propped. The 8x3.8 SF is almost too much for a 17t on 2s. If you want hotter than a 17, try 15t's of 25g. Makes a nice fill on the GB 22.7. If you can run 3s, a 20t, 26g is awsome with an 8x4HD. It has taken the place of the 17t as my favorite single:D

Len

[TeamSME]

Packing anymore with 26g after 18 gets a bit tough!

[lensrc]

Packing anymore with 26g after 18 gets a bit tough!

I do it with a three layer wind. bottom layer is total fill, second layer stops at wind 15, then transitions back out on wind 16, and continues back in to 20. I use the same method for the 25t 27g. I would take somes pics, but my digi-cam decided to start giving me trouble......

Len

[BeavrdamElectric]

Packing anymore with 26g after 18 gets a bit tough!

I had trouble getting 17 to work on my first GBv kit, but they told me to practice. Now they can't get rid of me.

Here's 13t of double strand 26g from Radio Shack, it has slightly thinner insulation. You can get 24t of newbie wire in 3 layers easy enough though 9, 17, 24. Some have gotten 30t of 26g.

Also, I think 15t of 24g fills the stator well. I wound 2 with 24g, one 14t and one 15t. The 14t one got rewound with 14t of 23g. If I was shooting for 20t, I'd use 25g (I've done 23t).

Good Luck!

[PlaneCrazee]

HOLY SMOKE! and ridiculously neat too. Did you sew those in BDE? How many 21ga can you turn?

[BeavrdamElectric]

No sewing on any of those stators, but I did use a trick on the 24g, I ran the wire along the back of the tooth and started winding at the top, down the tooth and back up. To do it conventionally you would have to sew the last few turns at the bottom.

I haven't run across any 21g, and I haven't sucessfully wound double 24g (equivalent) on a 22.7 stator. I tried 9t but it would have required a lot more patience than I had that night, plus I ran out of wire (the length I had cut) on the third tooth of the phase. I could probably do 8 turns.

Good Luck!

[ecologito]

I haven't tried 21 wire but this is the closest I've tried, 14 turns of 22 gauge wire :D

[BeavrdamElectric]

HEY, that's cheating, using a 23.8 stator!!! :D

Good Luck!

[aeronut66]

Thinking about TeamSME's original problem. I bought 2 GBv kits and they also stuttered past 1/4 throttle so I put them to one side and bought a cheap pre made motor as the idea was to go flying. Going to try and sort them out now as I don't like failing.

First thing I noticed is that the front bearing location. I've now changed it so that it just allows the plastic disc to click into place ~ the idea is to stop the windings touching the can ~ mine did which produced a short and lots of heat! I'm also checking that there is some clearance between the can and the windings when the plastic disc is touching the front bearing with the aid of some temporary paper discs.

Second thing is that in an effort to be neat and get 23 turns of 26g I may have a bit rough and damaged the insulation within the winding leading to an internal short ~ anyone see this before?