Reedy modifieds

[Dan Hughes]

What is the diference between all the different types of motors?

[scott_davis]

the KR's have quad magnets...

Can you specify what models you are comparing?

[Dan Hughes]

The kr's, ti's and pt's. What is the differences between them all?

[super__dan]

The kr's, ti's and pt's. What is the differences between them all?

In order of age (though do not assume newer is better, just different).

TI's small com (nominal 8mm) 2 magnet stand up brush

KR's mid com (9mm) 4 magnet laydown brush

PT small com (8mm) 4 mag standup brush

All motors have identical style cans and endbells (brush and magnet configuration apart).

Dan

[Dan Hughes]

Bit of a stupid question but iv got to know what is the difference between standup and laydown brushes and the size of the comm? And i assum that the 4mag ones have more torque?

[super__dan]

Bit of a stupid question but iv got to know what is the difference between standup and laydown brushes and the size of the comm? And i assum that the 4mag ones have more torque?

Most brushes are rectangular, not square faced. They are called standup when they the longest edge is perpendicular to the armature, and laydown at 90 degrees.

Actually 4 mags seem to rev better but produce a little less torque. The newest Infinity motors are a TI based component set which I like a great deal :D As I seem to have told a lot of people recently :o

Dan

[super__dan]

Oops, nearly forgot. The larger com motors usually produce more torque at lower revs, smaller com revs higher and produced more power at these high revs. Either can be accomodated within gearing, but people have various preferences so Reedy seem to accomodate most of them.

Dan

[scott_davis]

Most brushes are rectangular, not square faced. They are called standup when they the longest edge is perpendicular to the armature, and laydown at 90 degrees.

Actually 4 mags seem to rev better but produce a little less torque. The newest Infinity motors are a TI based component set which I like a great deal :D As I seem to have told a lot of people recently :o

Dan


Thats not quite true Dan... yes the quad mags rev higher but I have the figures here comparing two Integy 10 turn motors... one a twin mag and one a quad... the quad mag has equal / higher torque at similar revs to the twin mag....

Scott

[super__dan]

Fair enough, thats a good back to back test, that is assuming they were on an identical load dyno, etc etc etc :)

I'd actually like to try two identical motors like that (magnets aside) back to back to really feel for myself to understand.

Dan

[Dan Hughes]

Thanks to you both. So to put it in idiot proof terms
Small comm=more revs
larger comm=more torque
laydown brushes=longest side of brush laying down
standup brushes=shortest side of brush laying down

[super__dan]

Thanks to you both. So to put it in idiot proof terms
Small comm=more revs
larger comm=more torque
laydown brushes=longest side of brush laying down
standup brushes=shortest side of brush laying down

Thats about the size of it though its a bit of a simplification (comm size wise), but close enough.

Dan

PS Wanna buy a KR? ;)

[scott_davis]

Fair enough, thats a good back to back test, that is assuming they were on an identical load dyno, etc etc etc :)

I'd actually like to try two identical motors like that (magnets aside) back to back to really feel for myself to understand.

Dan

Well these are the dyno slips that come from Integy with the motors so yes they would be identical loads - can email you the figs if you like?

Exactly what I am doing myself... :)

[mr4man]

hi i dont think that statment is strctly true as reedy motors were explained to me differently.
ti= most torque due to most cogging
kr=very revvy but less torque hardly any cogging.
pt= mix of both best of both worlds.

[MattW]

I have tested nearly all of the configurations. In a nutshell i would say that Super Dan has summed it up the best.

Scot, Not sure how much that Integy quote is actually worth, because on track i would say that the Kr does have more RPM, but less torque - when compared to a conventional Ti.

However (and this might explain it). There are 2 different arms that could be used in any of the can varient. The 4mm (thin) and 5mm (thick) web. I have seen a couple of Integy "ti" based motors, and i think they use the 4mm web arm. This would bring their charastics further away from a "conventional" Ti and closer to a Kr.

The Pt is a bit of an odd one. You would think that it has the best of both, but this isn't necessarily the case. It has mega RPM (the can is slightly different, which gives even more RPM) but not much torque at all. Less than a Kr it would seem.

All this is track based experienced as i don't own a dyno!

[audi04]

Anybody knows what's the minimum diameter of a krypton comm before I should throw them away?

[scott_davis]

Anybody knows what's the minimum diameter of a krypton comm before I should throw them away?

You'll know like I did when skimming it for the final time ;)

But I think its around 6.8mm ? :confused: