Greyborg Cromotor Hubzilla motors, Sold Out

[nicobie]

ANY news on when the next shipment will land, and what changes will be made?

I'm up for a pre-shipment deposit as you have proved that you can deliver.

Nick

[Dlogic]

Count me in too. Already proud owner of a Cromotor and in desperate need for a second one for my latest build.

[methods]

This is a double post but I suspect a lot of guys dont read my regular rambling thread so here you go.....

[methods]

Here is some Dyno Testing - you guys may be interested in how easy it is to overheat a Cro even in 20" on only 100V. Dont assume it is indestructible... It is all about how you load the motor. Of course in this case we were deliberately beating the crap out of the motor just to try and test my controller - but still. It happens fast.

CroMotor - Dyno Proven Efficiency Data

I dub my controller the CroSmoker - as it hardly got warm and the room stank of Cro as we left

-methods

[gensem]

haha... that show two things... saturation is much lower (I was expecting 12-15g) running a hub on 50% efficiency will fry it in a minute.
Also i think its impossible to use a cromotor with 300a phase in a bike. Im used to my motors and anything over 150a phase needs a shit load of attention otherwise I will fall over my back.
All in all we need more pure copper in our hubs!

[methods]

We are going to fill it with oil and then blow the shit out of the cover.

Er... you can put a lot more than that on a bike. You just need to extend your swing arm further back - or ride it by sitting on the handle bars. Have you looked at Lukes bike or any of the other extreme non-hub bikes? They are running an order of magnitude more power than us - at speeds up into the triple digits.

-methods

[hillzofvalp]

I opened the cromotor today after 1200 miles of riding, parking it in parking garage. No rust yet on inside.. Still basically new looking. Bearings and seals must do a good job.. I almost feel I shouldn't ventilate it

[hillzofvalp]

I thought this thread could use a picture like this...





I suppose if I reapplied the ink then it would just be rubbed off when I put stator back in... which makes me wonder how these stators were installed perfectly at the factory without rubbing purple off..

[methods]

You should always upload your pictures to the forum.... so that way 3 years from now when that temporary upload site goes down we will not have a bunch of holes in the thread. Justin is super committed to never losing pictures again.

I suggest going and checking out the best threads from 2009 or 2010... half of the pictures are now broken thanks to places like Photobucket.

-methods

[hillzofvalp]

Noted... Just have to get in habit of resizing all my images.

Regarding cromotor, please check out my thread exploring water cooling design.. feedback is needed. viewtopic.php?f=3&t=43142

[methods]

There is a maximum width if you want them to show up - 800 pix is what I use. This guarantees that your pic wont get hosed.

I use Picasa
Put all the pictures in a folder ready for a batch edit
Click on a picture
Click on edit in picasa
Click on view library
Highlight all the pics
click export

I then add a water mark and rename - then send them to a sub-folder

I just always do it no matter what every time I get a batch of pictures. Keeps things consistent and is really nice if you are putting together a presentation or something where consistency counts

Anyway - it has to be easy or you wont want to do it. Thats what I always tell my wife

Water cooling?
Ugh... sounds complex.
I want to think about using oil to transfer heat to the case and then focus on cooling the case

-methods

[Sancho's Horse]

I may have missed it, but what kind of bearings does it have? Sealed, shielded, what? If it doesn't have sealed, I wonder if a special oil cooling ready version could be in the offing? I will be getting a cromotor for oil cooling (as soon as I get my head above water with my current projects ). I am planning on sandwiching layers of thin aluminum flashing to aid cooling. Thanks for the pics hillzofvalp araiso. I think they sealed the deal.

[hillzofvalp]

the big one is a 6205RZ.. the other is a 6004RZ. Sealed. They probably aren't very nice.. but I could tell they did the job keeping shit out of the motor. I will pop the seals and see if they got an adequate lube job from the factory. I will be upgrading most likely to a 6006 bearing (55mm OD 30mm ID) to try to fit in 1/4" coolant hoses...

From Muncie! Small world... I'm probably the only Cromotor in Indiana right know though if I had to guess. Let's have a Cromotor trek!

Side note: 6" gear puller is a HUGE time saver. Can't believe I wasted all that time in the past with wedges and shimming....

[Sigma]

f*** my axle broke off :S, would you happen to have a replacement axle :S or a way to fix it. heres the link to the images.
https://www.dropbox.com/s/6zjgwvacc38we ... 1%20PM.jpg
https://www.dropbox.com/s/gxu44i97k6vy0 ... 3%20PM.jpg
https://www.dropbox.com/s/3gaen2c9yelo9 ... 5%20PM.jpg
https://www.dropbox.com/s/i71mstqzcx8g0 ... 2%20PM.jpg

please let me know what I can do to fix this :S

open to suggestions from anyone!

[Arlo1]

f*** my axle broke off :S, would you happen to have a replacement axle :S or a way to fix it. heres the link to the images.
https://www.dropbox.com/s/6zjgwvacc38we ... 1%20PM.jpg
https://www.dropbox.com/s/gxu44i97k6vy0 ... 3%20PM.jpg
https://www.dropbox.com/s/3gaen2c9yelo9 ... 5%20PM.jpg
https://www.dropbox.com/s/i71mstqzcx8g0 ... 2%20PM.jpg

please let me know what I can do to fix this :S

open to suggestions from anyone!

What happened when it broke? Can you show us how you had it mounted? What kind of riding?

[Sigma]

I went over a bump and some how my phase wires touch so the motor stopped working. So once I took off the motor the axle fell off :S normal riding :S Ill take a Pic of how I had it mounted.

[Sigma]

here are the pics
https://www.dropbox.com/s/8j7m4k4c7al5s ... 1%20PM.jpg
https://www.dropbox.com/s/3ews43h7c0a49 ... 9%20PM.jpg
https://www.dropbox.com/s/torihjtg6l8j9 ... 5%20PM.jpg

[zombiess]

Were the axle flats perfectly flush in those drop outs? Where did the break occur in relation to the dropouts? I'm wondering if things got loose and made it act as a shear

I have some Doctorbass torque arms welded on a swing arm I'm a bit afraid to use because they aren't 100% square and I'm worried it will create a shear force on the axle. I need to find a way to tweak them square if I ever plan to use it at high power.

[Alan B]

Double torque plate, but only on one side?

How much motor power/current and speed?

[Arlo1]

Double torque plate, but only on one side?

How much motor power/current and speed?

Yeah it might have been loose on the other side and cause the side that was held by the torque plates to break!

[hillzofvalp]

YOu are absolutely killing me. All torque plate issues set aside... How many miles? Water power level? wheel size?.. maybe I need to reconsider making a new axle for my cromotor for my mb-5 project...


You should be able to have a machine shop make you a replacement.. luckily, this axle doesn't have splines.. just a keyway. Easier to replicate I would think.

[Sigma]

Hi, how would I remove it from the motor to get someone to make a copy of it?

[Sigma]

i've had maybe less then 500 km on this motor :S, if you do end up making a new axle for the motor would you be able to make a second one that I can purchase off you? I had a 26 inch wheel with the motor :S

[hillzofvalp]

If you send me your old axle I will make you a new one for the cost of material and tooling. I need an axle for reference.. I don't want to take apart my motor now.

To remove you need to take the c ring off and carefully press it out, making sure not to exert force on windings. This maybe could be done with a gear puller.

I have close to 2200 km on my motor at 5+kW in a 29" wheel. That's peaks of around 160-180 phase amps (zero block time). I think you had it installed incorrectly.

[zombiess]

i've had maybe less then 500 km on this motor :S, if you do end up making a new axle for the motor would you be able to make a second one that I can purchase off you? I had a 26 inch wheel with the motor :S

Sigma, were you really running 120v @ 90a in a 26 in wheel, if so what phase amps? Im trying to get an idea of the forces involved. You say the axle didnt break until you removed it? Did you use a hammer because it was stuck or anything like that? How tight did you have the nuts? Every tim ive broken a wheel stud on a car was when i was loosening it, including arp heavy duty studs. I believe you are the first to break an axle on this version of the motor. The other one that broke was the older version i run in my high powered bike.

I do have 1 complete motor but it has a crack in the cover i can sell if you want it. I was going to use it on a 24 or 26 in build since the crack doesnt concern me and i wasnt planning to push it higher than 5kw since its a big wheel.