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Old 04-22-2009, 11:02 PM
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Default Slotted Spiral Armature?

Is this slotted armature also a spiral?



link to armature page:

Aramture

CreativeSN said so (going by picture) here.

It looks a little spiraled to me.
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Old 04-22-2009, 11:11 PM
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It's spiraled. I've had it in a motor that CreativeSN (Tim) made for me a long time ago.
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Old 04-22-2009, 11:14 PM
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Thanks! So, I'm guessing this in a 50t 30AWG pattern wound motor with neo mags and a ball bearing can would rock a stage 2 and still be FET safe?
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Old 04-22-2009, 11:21 PM
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Whats the benefit of this over regular armature?
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Old 04-22-2009, 11:23 PM
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I read it reduces electromagnetic permeability, thus reducing friction and allowing higher speeds.
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Old 04-22-2009, 11:37 PM
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Quote:
Originally Posted by Pwnzor1130 View Post
Thanks! So, I'm guessing this in a 50t 30AWG pattern wound motor with neo mags and a ball bearing can would rock a stage 2 and still be FET safe?
Yea, thats safe. I believe it's nothing under 43t is safe. Someone correct me on that, I'm a little off.
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Old 04-22-2009, 11:45 PM
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A gen1 could handle 43T with Iso magnets if you weren't running highspeed gearing. I ran like a 10T gear with liths, good for near 25mph on the street but it killed the stock FETs in short order. A single stack of aftermarket ones was all it needed. But with shorter gearing, and batteries you'd be plenty safe.
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Old 04-23-2009, 12:44 AM
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I don't think that is it...: I read it reduces electromagnetic permeability, thus reducing friction and allowing higher speeds.

I understand that the stacks are closer together resulting in a more consistent spin because there is less of a gap in between each armature pole. If you look at a straight-stack armature, there is a greater gap between each pole vs. this Auldey armature. I know this from hand winding on these exact armatures and the results I have tested on 1.25v and 6v make me think that spiral armatures do have less "lag" then regular armatures found in radioshack xmod motors. (also in most aftermarket motors made by large part companies)
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Old 04-23-2009, 01:00 AM
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Well, maybe, maybe not. It is better though .
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Old 04-23-2009, 10:45 AM
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Quote:
Originally Posted by dontspamme View Post
Yea, thats safe. I believe it's nothing under 43t is safe. Someone correct me on that, I'm a little off.
I run a 39T in an ERG can in my Xmod EVO on stock FETs with no problems. However, I'm not going balls out either, just moderate driving.

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Old 04-23-2009, 04:09 PM
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The evo can handle a 38t motor with stock fets, but 8/25 gearing, ball bearings and bb can, no Neo mags either, are recommended to keep the resistance to a minimum and less stress on the motor. The gen1 i believe is 43t. The new streets should be the same as the evo...

This topic about how many turns can this esc/car handle? has been covered many times. the search button is one of the best inventions for the internet .

I believe that is a spiral slotted i have 2 of them and 2 normal spirals, they look just like that one.
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Old 04-23-2009, 05:59 PM
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Quote:
Originally Posted by Skv012a View Post
Whats the benefit of this over regular armature?
the spiral/slotted arm also let's the motor run cooler.
the spiral acts as a corkskrew pulling air through the end bell and the slots allow more cooling since there's less mass to hold heat.
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Old 04-23-2009, 07:30 PM
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Quote:
Originally Posted by bondo View Post
the spiral/slotted arm also let's the motor run cooler.
the spiral acts as a corkskrew pulling air through the end bell and the slots allow more cooling since there's less mass to hold heat.
Exactly! Also, it does reduce electromagnetic permeability according to CreativeSN. Here's proof.

Quote:
Originally Posted by CreativeSN
Thus the lower the magnetic interaction between the coils and magnets, the faster the motor.
Quote:
Originally Posted by CreativeSN
The slots reduce the electro-magnets permeability, and thus reduce the magnetic strength making the motor spin faster.
source

Also, the lower magnetic strength reduces back-voltage, not friction. Sorry about that.
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Old 04-23-2009, 08:19 PM
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Quote:
Originally Posted by Pwnzor1130 View Post

Also, the lower magnetic strength reduces back-voltage, not friction. Sorry about that.
Technically known as "counter EMF" which is quite destructive to electric motors at high voltage levels/RPM.
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Old 04-23-2009, 09:00 PM
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Quote:
Originally Posted by ZX9RBART View Post
Technically known as "counter EMF" which is quite destructive to electric motors at high voltage levels/RPM.
Would the conditions of an Xmod motor fall under your catagory of destructive?

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Old 04-23-2009, 10:59 PM
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Well, I would think it wouldn't be THAT bad in such a small motor. No where near destructive. Maybe in a super super crazy high turn high-scale brushless motor....
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Old 04-23-2009, 11:04 PM
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it's pretty destructive.
30k rpm and 7.2 volts at like 5 amps?
destructive.

counter EMF is also called back EMF. it's a product of the generator effect that a coil has in a magnetic feild. it's an AC charge. back EMF also limits the motors top-speed. there's more back EMF in lower rpm motors, resulting in a slower spinning motor, but in both high-speed and low-speed motors at their topspeed, the back EMF equals the energy that is put into making it spin. this is called equilibrium. the net acceleration is zero since the back EMF has countered all of the force that is used to accelerate.

back EMF increases in proportion to rotor speed.

the spiral arm reduces back EMF by producing a weaker magnetic feild, allowing a higher speed before reaching equilibrium.

if not for back EMF, then a stage 1 motor could reach an infinite amount of RPM at any voltage
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Old 04-27-2009, 09:26 PM
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The motor you described is destructive! However, not everyone runs an X2 Lightspeed Pro...
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