The Unofficial 'CroMotor' Owners Tech-Tips Thread

[gensem]

Anyone else measure their axle at 16mm instead of 14mm?

I can check with a caliper when I get home.

[Lavolta]

Hi Guy's,
My first post on this forum.
I got # 6 or # 9 (depending on which way you look at it)
It came with no nuts or washers and the axle measures 16mm.
It will be laced into an Excel 19" Moto rim once the spokes arrive.

When the build is finished I will post some pics.

Cheers
Bruce

[gensem]

Anyone else measure their axle at 16mm instead of 14mm?

I can check with a caliper when I get home.

axle is 10x16mm

[fractal]

the nuts are M16 fine thread(1.5mm)

POST EDIT : m16 and not m12

[Alan B]

Hi Guy's,
My first post on this forum.
I got # 6 or # 9 (depending on which way you look at it)
It came with no nuts or washers and the axle measures 16mm.
It will be laced into an Excel 19" Moto rim once the spokes arrive.

When the build is finished I will post some pics.

Cheers
Bruce

Welcome to ES, Bruce!

I'm confused by the #6 and #9 nomenclature.

My axle threads measure nearly 16mm so I would expect it is M16. I didn't measure the pitch. I'll try to do that tonite. But I may be distracted with the other box that should come. The big one.

The flats are just under 10mm. So that's pretty standard. But the threads are larger than the 12mm on new Crystalyte motors and the 14mm of the 9C.

Mine came with Nuts and no washers.

These new larger flats look GREAT to me. The small flats are a major problem with torque arms and dropouts working properly. This really makes it easier.

Do Kiwi's Greyborg torque plates have 16mm diameter for the axle threads??

[fractal]

i went to a shop called fastenal with my cromotor, the guy measured everything and sold me some m16 fine thread nuts.

edit : m16 and not m12

[fractal]

SORRY I MADE A MISTAKE. they are m16 and not m12!!!! i edited previous posts.

[Alan B]

Excellent. M16 is good.

[Lavolta]

Hi Alen B,

Thanks for the welcome.
My motor has some tape with the number 6 or the number 9 printed on it.
I can not tell if it is six or nine as it depends which way you look at it.

What is the big one ??

I have just recieved notice i also have a shipment arived
one 4 Kw hub motor in a 18" wheel and one 7Kw motor in 17" wheel.

Cheers
Bruce

[oatnet]

I'm confused by the #6 and #9 nomenclature.

All of the motors came with a large "serial number" on them. For example, anderym got SN #1, pictured below, which might help Bruce figure out if his is 6 or 9:

[Alan B]

Ok Bruce. 6 or 9 might be the serial number. Mine has some tape residue, the tape was removed. So no serial number.

The big box still has not come. Expecting a frame and forks to go with hubzilla.

[gensem]

Alan I also have the big cromoly frame and it its a piece of art... but i ll not unleash it till Hal releases a bigger motor.

[Alan B]

Really. 12kw is not enough?

Perhaps you should put one of Luke's Golden Motors on it.

The frame and motor were shipped at the same time. The motor arrived a couple days ago. The frame not yet.

[gensem]

Really. 12kw is not enough?

Perhaps you should put one of Luke's Golden Motors on it.

The frame and motor were shipped at the same time. The motor arrived a couple days ago. The frame not yet.

im thinking of something like 3 magic pies stacked together.
and viva la fiesta...

[fractal]

Hey guys, I need help programming my controller for my cromotor. Any help would be great. Here is my setup :
hub : cromotor 9Kv
controller : Lyen 24 x 4115 MOSFET 84-132V Freeway Speed Controller
pack : 24s 3p lipo (nominal 88.8, off the charge 100.
I have read a lot about programming controllers, a lot of the info is spread out on the forum, i'm still not sure. I just need somewhere to start.
***I want to limit the current to 80 amps, the controller is rated to about 8000 watts

Phase Degree : ?
Phase Current : ?
Rated Current : ?
Halt Voltage : ?
Tolerance : ?
EBS LimVolage : ?
block time : ?

Thanks for any tips!!!

[gensem]

Hey guys, I need help programming my controller for my cromotor. Any help would be great. Here is my setup :
hub : cromotor 9Kv
controller : Lyen 24 x 4115 MOSFET 84-132V Freeway Speed Controller
pack : 24s 3p lipo (nominal 88.8, off the charge 100.
I have read a lot about programming controllers, a lot of the info is spread out on the forum, i'm still not sure. I just need somewhere to start.
***I want to limit the current to 80 amps, the controller is rated to about 8000 watts

Phase Degree : ?
Phase Current : ?
Rated Current : ?
Halt Voltage : ?
Tolerance : ?
EBS LimVolage : ?
block time : ?

Thanks for any tips!!!

I would start at 40 main amps to test and would raise it slowly.
Anyway, if you must use 80a, try something like this and be carefull to not hurt yourself and try not overheating it...

Phase Degree : auto
Phase Current : 200
Rated Current : 80
Halt Voltage : 72-75v
Tolerance : use default
EBS LimVolage : Will need R12 mod for 100v regen
block time : lowest possible

[fractal]

What is the best way to test the Kv of a motor?

[Farfle]

What is the best way to test the Kv of a motor?

If you spin it up under no-load, and record the voltage and speed. It should give you a close kv number.

[Alan B]

Record voltage and RPM at no load.

[fractal]

Record voltage and RPM at no load.

"no load" means the wheel spinning freely with the bike upside down?

[Farfle]

Record voltage and RPM at no load.

"no load" means the wheel spinning freely with the bike upside down?

Yup

[dangerzone]

Moped 17" wheel is ready (~22,7inch bicycle size) around 15,8kg !

What do you guys think???





Maxxis 24x 2.4 for size comparison.

Paintjob is not ready yet coz I runned out of matte black spray paint... wheel was regular black and I do not like it shinning.

Next week I should have the frame ready with Doc torque arms and some adaptations. But im still short of front bicycle wheel and 24 fet controller to test the hub motor...


(btw can anyone tell me how to use thumbnails in here)

Excellent work, which wheel rim is it, what bike did it come from..?

How long are your spokes and is there a reason why you wanted the spoke angle to be that wide..? Cause it seems that the spokes come out of the wheel rim at an inadequate angle which might lead to some wobble at higher speed or leaning angles...

Im yet to understand the 2.75 in moped tires. I tought it was 2.75 inchs but my meter is telling me the treadline is almost hitting 3.3" wide.

The 2.75 in motorcycle wheels means the inside distance between rim walls is 2.75 inches. The importance of this is to have the proper tire dimension which would stick to the rim walls preventing tire rotational slip (at high horsepower, breaking power or torque) and the wobble in aggressive curve leans. There are methods of preventing that but check first the tire and rim size cause your setup seems quite well.

http://www.dansmc.com/rimsize.gif

Now, I do have a 17" wheel rim that came from a Kawasaki KLE500 which would be adequate for the Cromotor in my setup. Yet the lacing should be a bit different than yours, following the angle of the rim nipples, something like this:

http://hphotos-snc3.fbcdn.net/hs219.snc ... 0154_n.jpg

I am waiting for Accountant to get the next shipment of Cromotors so I could determine the right spoke length for the 17" wheel rim. Has anyone else got the Cromotor in a 17" wheel..?

[dangerzone]

Anyone got some footage yet of these motors in action?!

I should this weekend, finally got up and running tonight with 125V@102A into a 21.5" diameter tire... yeah, it pulls hard and I need to turn the power down a little. Torque is unreal.
viewtopic.php?f=3&t=35834

I've seen your videos, nice.

Did you want to try some other wheel size, like a bigger one..?

[gensem]

Next week I should have the frame ready with Doc torque arms and some adaptations. But im still short of front bicycle wheel and 24 fet controller to test the hub motor...

I am waiting for Accountant to get the next shipment of Cromotors so I could determine the right spoke length for the 17" wheel rim. Has anyone else got the Cromotor in a 17" wheel..?

Thanks for the help dangerzone, im already using a thinner rim and smaller spokes.
The lacing pattern is still odd because I did not had proper sized spokes, but its looking much better already, ll post a picture later.

[dangerzone]

Next week I should have the frame ready with Doc torque arms and some adaptations. But im still short of front bicycle wheel and 24 fet controller to test the hub motor...

I am waiting for Accountant to get the next shipment of Cromotors so I could determine the right spoke length for the 17" wheel rim. Has anyone else got the Cromotor in a 17" wheel..?

Thanks for the help dangerzone, im already using a thinner rim and smaller spokes.
The lacing pattern is still odd because I did not had proper sized spokes, but its looking much better already, ll post a picture later.

Great, looking forward...

There are several different ways of lacing, if you need ideas check out some old drum brake motorcycles, many of them have shorter spokes. But in the end, it all comes down to your rims and the way they are meant to be laced. Maybe this could also help:

http://www.oldbritts.com/image/wlacing5.jpg

http://www.oldbritts.com/image/wlacing6.jpg

http://www.cyclexchange.net/index%20pic ... %20rim.JPG

Some rims/wheels even tend to have asymmetric lacing patterns:

http://www.wswws.com/media/images/image ... g3107w.jpg


Anyway, keep up the good work...