Cutting a motor commutator & motor tweaks

[EddieO]

More armature porn.....please get a towel before looking

Enjoy...

Later EddieO

 

[Onebdgti]

Wow those are nice. Now what the deal with the last pic. What rite below the comm?

 

[EddieO]

That's a comm ring or comm hat. Orion sorta came up with it as a way to reenforce the comm solder joints while cooling them too. Was basically an upgrade over the old school tie wraps still used in slots .

In the end trinity, fantom and even Orion were using mine on their team motors, as it was the superior design.

Since comm ring, comm hat, and comm lock were all taken as names... I ended up calling mine jimmy hats... Seemed to fit, as they are meant to stop something from exploding all over the place.


I'll be doing a limited edition with them soon.

Later EddieO

 

[mark reel]

oooooooh yeah, those look awesome EddieO

 

[stanmondz]

i didnt take any pics when i took it out of the box.

heres my sewer pipe lathe after a few minutes with a sos pad. only a tiny bit of rust on the top and side of the bit

 

[schiesz]

Nice. I'll be slightly less scared of the horrible looking ones on ebay now

 

[Archangel]

Those are some interesting looking armatures. What's up with the twisted one? What's the benefit of that?

 

[EddieO]

That's a Skewed armature. Skewed arms have very smooth start up, but don't don't have any of the draw backs the 5 segment arms do (lack of torque, bad drag brakes, etc). The only downside to them really is they are less efficient. I only recommend them in comp crawlers, specifically ones where you are using a new pack for each course.

Skewed arms never really took off in racing, as when they came out, Touring Car was all the rage.......and runtime was VERY important, so an inefficient arm was NOT helpful. They had a bit of a following in 2wd Mod offroad, which smooth start is helpful because of the lack of traction. Trinity discontinued them before offroad started getting big again.

Later EddieO

 

[DickyT]

That's a Skewed armature. Skewed arms have very smooth start up, but don't don't have any of the draw backs the 5 segment arms do (lack of torque, bad drag brakes, etc). The only downside to them really is they are less efficient. I only recommend them in comp crawlers, specifically ones where you are using a new pack for each course.

All Hail the Skews :twisted:

I really love the set I have in my berg right now. "thumbsup"

 

[EddieO]

They are pretty damn sweet that's for sure.......but I always keep striving for to make stuff better....so little time in the day to complete all these projects!

Later EddieO

All Hail the Skews :twisted:

I really love the set I have in my berg right now. "thumbsup"

 

[Charlie-III]

They are pretty damn sweet that's for sure.......but I always keep striving for to make stuff better....so little time in the day to complete all these projects!

Later EddieO

OK...I'll bite......is there a "selection of skews"?? Lets say we want something in-between those shown vs. "90*"??

Is the difference even worth mentioning??

PS, paying bills so I know if I can order 35T arms for my Checkpoint cans......

 

[EddieO]

Well, the old trinity skews, which are pretty much all gone used a much more tame skew than the Sagami version I am selling.

The more you skew it, the more it effects stuff. Yes, lowspeed will get better, but efficiency will keep going down. Another problem is the winding, the more aggresive the skew is, the harder it is to wind, and the skews are already MUCH harder to wind than a normal armature.

Problem you have right now, is I don't have any sagami skews with 7.5mm comms yet.....just 10mm, which is too big for the CP can. I have them on order, but we are talking middle of april. I may be able to find some trinity ones though. The trinity ones never look as good though because of the Hysol....just made them a pain to wind.

Later EddieO

 

[Charlie-III]

Thanks for the info....as always.8)

 

[2500hdon37s]

sweet rust brah!

 

[EddieO]

Yeah, happens. Its electrical steel....they all rust, especially if the hysol isn't applied uniformly. That particular arm just got here from japan too....gonna have to retake that photo.

It's removed before it wound.....no biggie.

Good constructive post though, it really contributed to the thread.

Later EddieO

 

[JohnRobHolmes]

The skewed arms do have smooth startup when properly done in full pitch, or when combined with a field weakened magnet. Both of which contribute to the inefficiency. A full pitch skew is 1/2 the magnet width. The sagami skew is about half pitch. Most of my competitive team members that have used the skewed arms have switched back to Crawlmasters because of the inefficiency. It is the difference between needing a 650mah pack and a 1000mah pack for a course, which makes a noticeable difference in center of gravity and rig performance.

I would go about it the other way. The five slot gets all the benefits of the skewed arm without the drawback of inefficiency. If torque density is the primary concern then neither the skewed arm or the 5 slot is a good choice anyway. If poor drag brake is a concern, the wrong ESC is being used. Of course choices are always good, as there is no such thing as the perfect motor.

Since this has turned into a pron thread, here is a 23t arm I just wound up for a Wraith. He didn't want to break too many parts so we didn't go nuts on the copper fill.

Do you think your weather has anything to do with the rusting Eddie Goodridge? I haven't had issues with rusting, but I don't think it is quite as wet here as compared to Washington.

 

[EddieO]

Torque loss doesn't happen on a skew like it does on a 5 segment, not even close. Drag brake on a 5 segment is terrible, and people should not have to use a different ESC just to gain suitable drag brake. Multiple of my drivers have no issues with run time with 800 mah packs and such.

JCboof, sure likes the skews you sent him. I have not seen a single other of your team drivers post they were using skews.

As for the rust, that arm came like that straight from Japan. I didn't wind it intiallly since it came like that.

Our weather? You realize in washington, it doesn't rain all the time like everyone thinks right? 38+ states every year have more inches of rain fall per year than washington does, including you own state. Our average humidity is low 80s, as is yours....same as Michigan where Fantom is. My trinity arms always had LESS rust than Sagami stuff, and their humidity in NJ was the same (now Florida). Arms straight from Reedy in sunny california used to arrive with rust all the time, same with Checkpoint and Orion.

Add in the fact, my shop is in my house (not the garage)....where there is no humidity really....

If you look closely at your arm, its either REALLY dirty between the laminations or those are small things of rust. What's the black residue on the top of the segments?

Like I said though, it cleans off before winding. The point of the pictures are not show a perfect done armature, but to show the armature in its rawest form so people can see the difference.

Is there a reason you typed out my full name? Not that I care, just seems strange...

Later EddieO

 

[EeePee]

Is there a reason you typed out my full name? Not that I care, just seems strange...

Later EddieO

:ror:

It did seem strange.

Later EeePee

I thought it was always raining in Washington. Or snowing. And sucking.

 

[EddieO]

Heh, it rarely snows on the west side of the mountains....does on the east side and in the mountains....but not anything nutty.

Rain is the big myth here....it rains, at odd times.....but google the yearly inches of rain fall and compare.

As for sucking, well.........clean air, clean water, clean land....well, I think I will stay right here

Later EddieO

:ror:

It did seem strange.

Later EeePee

I thought it was always raining in Washington. Or snowing. And sucking.

 

[EeePee]

...but google the yearly inches of rain fall and compare.

As for sucking, well...

Not caring enough.

Yep.

Later, EP