Alan B
100 GW
Use www.Greyb.org to see the website. Last time I checked they don't sell the motor on the site.
PM to Accountant here on ES for availability outside US.
PM to Accountant here on ES for availability outside US.
Alan B said:Use http://www.Greyb.org to see the website. Last time I checked they don't sell the motor on the site.
PM to Accountant here on ES for availability outside US.
methods said:I sell them outside the US - website in sig of my post.
If someone wants one without the temp probe we may be able to accommodate that request. I suppose that would be $595 or whatever the going rate is.
-methods
Alan B said:Use http://www.Greyb.org to see the website. Last time I checked they don't sell the motor on the site.
PM to Accountant here on ES for availability outside US.
Scott said:Has anyone oil bath cooled a cromotor?
I have seen a few water cooling ideas but it looks like they have been abandoned.
At 16kw and at some point 20kw I would prefer to not vent/ drill holes in my covers. I don’t want to risk weakening them at all.
Thanks,
Scott
xenodius said:So I developed a squeak from my motor only present at 5-18 mph while a load is on the axle, e.g. while I'm sitting on my bike. Swapped out the bearings (thanks Brake for the puller and assistance!) And it's still squeaking! Inside appears to be clean, rides great up to 55mph but it squeaks and it's driving me nuts! Any thoughts? With the wheel suspended, it's dead silent... and it's not my freewheel either.
And yes, one bearing was suspect by feel when removed. And it sounds exactly like it did before. Once per revolution.
No cromotor here but Xiechang has automatic hall detection. It is simple for the controller since 60 degree will have a point where all 3 halls are on. For current use following.Jonboy said:Any Guru out there care to chime in ?
Cheers
Jon
I limit current 100A battery and 180A phase on Lyens 18 Fet at 24s, continuous is under 2.4 kW. Always monitor the temperature to see limitations. :wink:by ZOMGVTEK » Wed Apr 11, 2012 4:51 pm
The thing that determines the 'peak' power is going to be the MOSET's themselves. They have a somewhat 'soft' limit. It's not like voltage, where even going 1V over might be enough for the FET to go short. You can go a few A's over and things should be OK if you keep them cool and the duration short enough.
Continuous power handling is an entirely different beast. It's really only determined by how much heat the controller case can dump. If you water cool a 18FET and do a few mods to get a really low delta between the silicon in the FET and the heatsink, you can basically run the controller at its peak power 24/7. Otherwise, continuous power can be as low as 10% of 'peak' power.
According to this spec sheet...
http://www.irf.com/product-info/datashe ... 110pbf.pdf
The IRFB4110PBF TO-220's commonly used in high power e-bike controllers should be good for 180A at the silicon level, which is the more important number if you really are interested in pushing things, especially since we don't tend to be riding the current limit that long so long as it is sufficiently high. A good assumption is that for every time you double the number of FET's, you can handle 1.5x the current. This means every additional FET adds roughly 2/3 of its max rating. Since the controller only really cares about phase current, we will use that, assuming it's 2.6x higher than the battery current, at least in the lower speed region thats more critical. For an 18 FET controller, we have 3 phases, making 6 FET's per phase, which is then split up evenly into a high and low side. This means your power handling calculations should be done with the assumption of 3 FET's doing the 'work'. With 4110's, you can handle a max of 180 + 2(2/3)180 = 420A in a 18 FET controller. This is roughly 160A battery current. Setting the battery/phase to 160/420 respectively would roughly be asking the controller for 100%, which tends to be a bad idea, since this limit can often be loosely enforced at times. Playing it 'safe' would put the max limit around 20% lower than this, 125/200. This should be OK if you can keep the controller cool.
100% limits are roughly 16kW for an 18 FET 4110 @ 100V.
Moving on to the 4115's....
http://www.irf.com/product-info/datashe ... 115pbf.pdf
104A silicon limited. Same 18 FET controller, 104 + 2(2/3)104 = 242A phase, 93A battery. Assuming you run 150v into these (bad idea), you can get roughly 14kW out of a 18 FET IRFB4115PFB controller, absolute peak. Take 20% off this to 'play it safe' and you are down to just over 11kW. Even trying to get 11kW out of one of these would be a struggle, but it should be possible with the right tweaks.
100% limits are roughly 14kW for an 18 FET 4115 @ 150V.
Run the 4115 at 120-130V and the limitations are even more obvious. The IRFB4110PBF's are just better FET's for power. Unfortunately >100V right now isnt the best way to get a ton of power, at least with off the shelf hardware.
I should probably note, these 100% figures are not reasonably obtainable. Running a controller even at 80% of its limits takes a mad man.
Allex said:For what I know, Many people uses this Quanshun motor. What Cromotor team did is take quanshun motor and modify it for ebike. Also maked sure that the factory uses good quality parts.
You can actually buy a quanshun that is better than Cro. Factory do mods like better copper fill on stator and better axle. Cost a bit more than original Cro though!
madin88 said:I have asked him in another thread about what modifications they do with this motor, but yet no answer. They also do not answer emails etc. Not very good support.