The Unofficial 'CroMotor' Owners Tech-Tips Thread

[oatnet]

Can someone confirm if it's the width of 3 x 9c stators?
I'm drooling at the thought of so much less end-turn losses. Should have a pretty crazy high saturation current as well.

I don't have it on-hand to measure, but here is a picture of the stator, it has had me drooling too - out of several orafices, I might add.

-JD

[chroot]

Please someone send vids in youtube as in action I.E. 9x7 9C vs CroMotor!

How difference between xlyte 5403 vs this CroMotor and who best?

[The Mighty Volt]

Please someone send vids in youtube as in action I.E. 9x7 9C vs CroMotor!

How difference between xlyte 5403 vs this CroMotor and who best?

Cro has already gone on record as saying that, all other things being equal, this motor is "better than any motor Crystalyte make".

Pretty big claim, but that motor looks savage. Its basically a Moped motor, on a bike.

My main concern now is its behaviour....specifically the question of how quickly it reaches the state of BEMF....does it exhibit slow-winding or fast-winding characteristics.

This is critical because JohnInCr, who seems to have pioneered riding with a moped motor, has encountered issues whereby his bike, with a 20" wheel, needs to hit 30mph before the BEMF begins to tame the current draw and limit the amps the controller has to deal with. There is the potential for these motors to blow controllers like Divine Brown blows Englishmen.

[chroot]

Great, I am looking forward someone show the vids on cromotor and compare other motors. I agree with your comment and we need find out all how the cromotor behavior and stuff.

PS. Lets get one for Luke to test it like he did blow up his HS35 with full of the PLASMA!

[liveforphysics]

Great, I am looking forward someone show the vids on cromotor and compare other motors. I agree with your comment and we need find out all how the cromotor behavior and stuff.

PS. Lets get one for Luke to test it like he did blow up his HS35 with full of the PLASMA!

I do have a motorcycle dyno that can measure up to 350hp, power supplies that can do 30,000w all day and all night, and battery banks that could burst over 1,000kw. And controllers that can deliver 650 phase amps continuously at 116v.

So, yeah, I think I could find the limits and make some plasma with one.

[texaspyro]

So, yeah, I think I could find the limits and make some plasma with one.

I've fired up the popcorn popper.... I'm awaiting the videos...

[liveforphysics]

So, yeah, I think I could find the limits and make some plasma with one.

I've fired up the popcorn popper.... I'm awaiting the videos...

Somebody send me a victim. You know I don't disappoint.

[gensem]

Thats going to be an expensive barbecue.

[John in CR]

Anyone know the Kv of these. I'm guessing 15-16ish rpm/volt based on the Italian guy's reported results at high voltage, and if so it's probably a 2 turn, and good luck driving it above 100A. However, 100A is going to be fun with what appears to be a 50mm stator. My main motors are only 40mm and pretty fun. My larger diameter motor is the only hubbie I have with a 50mm lamination stack, and it's big time fun in a 19" diameter wheel. Plan on buying controllers 2 at a time if you want to push performance.

You guys are going to have fun with this one. I understand it's pretty light weight for such a big motor, so it will be interesting to find out where they shaved the weight. What's the thickness of the magnet backing ring for example? I heard the motor ran pretty hot at high speed. I'm curious if we're starting to see high enough operating frequency for iron losses to really kick in, or did they save weight with less steel in the core resulting in needing to go to saturation for enough current, or was the bike just improperly geared with too large a wheel for that voltage? I ask because my motor has never run hot on the highway.

[Philistine]

What guage are the phase wires? They look like 12, but it is hard to tell given the size of the motor (ie, the hugeness of the motor might make the wires look smaller than they are).

Are there any more still available from Accountant or are they all sold now?

Please Oatnet hurry up and clean off your orifi and lace that bad boy up and get us some reports up here.....

[amberwolf]

Apologies for the OT, but:

hh.JPG (65.86 KiB) Viewed 1102 times

Hmmm....




viewtopic.php?f=30&t=32838

I haven't measured them, but they are about the width of my pointer-finger's length.

Now I wonder what kind of power I can get out of that thing.

EDIT: Added measurements:
Stator: 50mm width, 170mm diameter
Magnets: 53mm width, 171mm diameter (0.5mm airgap at most)

[gensem]

Anyone know the Kv of these. I'm guessing 15-16ish rpm/volt based on the Italian guy's reported results at high voltage, and if so it's probably a 2 turn, and good luck driving it above 100A. However, 100A is going to be fun with what appears to be a 50mm stator. My main motors are only 40mm and pretty fun. My larger diameter motor is the only hubbie I have with a 50mm lamination stack, and it's big time fun in a 19" diameter wheel. Plan on buying controllers 2 at a time if you want to push performance.

You guys are going to have fun with this one. I understand it's pretty light weight for such a big motor, so it will be interesting to find out where they shaved the weight. What's the thickness of the magnet backing ring for example? I heard the motor ran pretty hot at high speed. I'm curious if we're starting to see high enough operating frequency for iron losses to really kick in, or did they save weight with less steel in the core resulting in needing to go to saturation for enough current, or was the bike just improperly geared with too large a wheel for that voltage? I ask because my motor has never run hot on the highway.

I think its more likely 3 turns, but yet if you push it too hard you ll get a smelly controller soon. I wont go over 85v using 4110fets at first to be no the safe side.

[fractal]

would my lyen 24fet freeway controller be a good match for this one ? (i'm sure it is, i just need an expert opinion )

[oatnet]

would my lyen 24fet freeway controller be a good match for this one ? (i'm sure it is, i just need an expert opinion )

It would. Kelly Controllers also have 120v and 144v series.

-JD

[fechter]

Nice

Better have some really strong spokes.

[gensem]

Nice

Better have some really strong spokes.

When say strong, you mean something like a 12ga sapin?

[fractal]

Nice

Better have some really strong spokes.

When say strong, you mean something like a 12ga sapin?

oh yeah 12 minimum. JRH is the man for that

[chroot]

If you are near ilia (ebike-sf) in San Francisco, He can do lacing to the rim, true balance and He is using sipam spokes.

[gensem]

Im in Brazil -.-

[chroot]

.

[oatnet]

oh yeah 12 minimum. JRH is the man for that

Yeah, JRH is putting mine into moto rims/spokes/tires.

-JD

[fractal]

oh yeah 12 minimum. JRH is the man for that

Yeah, JRH is putting mine into moto rims/spokes/tires.

-JD

What size tire and rim??? It will fit your A-line?

[oatnet]

What size tire and rim??? It will fit your A-line?

That's the plan... Talk to JRH and he'll hook you up.

-JD

[andreym]

Can someone confirm if it's the width of 3 x 9c stators?
I'm drooling at the thought of so much less end-turn losses. Should have a pretty crazy high saturation current as well.

I`m sorry to disappoint you Luke, but it looks like it`s only 2 X 9C width

here is the pictures from http://www.greyb.org/assembler.html
I believe it is the same motor. So stator and magnets of "CroMotor" looks like 55mm and we all know 9C is 28mm





I still have not opened mine, but when I do, I promise to take detailed pictures of the inside

btw here is my serial number on the disk brake side cover

[andreym]

Some additional motor pron and more accurate measurements

the stator and magnets appear to be ONLY 50mm width though 5404 is only 42mm


































oversized pictures can be found here https://picasaweb.google.com/1108717824 ... fdrLnIlQE#