Thanks RWP,
& sorry to hear about your issues, your bikes are beautiful & deserve to be out in the wind.
The adapter is a one off- but a simple fabrication...the disc bolt circle is 44mm & the internal is a somewhat standard 30x1 mm thread (small BMX). I sorta fudged it as & don't have a proper pick gear to do a 1mm thread. it becomes a Jam fit for the last 1/8 turn onto the hub.
Here is a better pic of the rear adaper:
No problem bringing up controllers. All of my work is focused on the big outrunner's....& using the existing magnets to trigger the hall sensors.
I bought a batch of 12fet infineons from the e-crazy man awhile back just for side by side testing & have been giving myself some lessons (learning by watching over the shoulders Of Mr Harris & Ricky in NZ) on controller assembly & operating. I am getting good results using irfb3066 fet's in them after making the R43 Mod to side step the over current interupt circut. The only issue is, I am limited to 60v Max......I have bugeted for some irfb3077's to push back up to 72v if i think i need it...These are like thoses mr Lyen provides....Just without all of Edwards fine work in them.
Hall sensors on outrunners:
Using Burties size optomised 17.14deg spacing has been good & bad...on the smaller 63mm motor, it seem's to perform perfectly....I can reset the zero position in several spots about the can, & adjust the timeing up & down & get the predicted results...powers the bmxer fine with a modded 6fet (4110's in it) @ 48v other than being current limited...it just works.
The Casle hv160 pulls a bit stronger through to top speed,(quite a bit actually) But under max (really stupid max) load I can hit the current limit. Then weird things happen. 50% of the time the motor will revers...(???) After freewheeling to a stop I have to unplug to reset the controller to get rolling again.
The mid throllte/RC controller issue is: Unbelivablely high current spikes generated when the controllers are chopping the current (pwm)...under heavy load & partial throtle (flyback effect?) the FET's don't have the theramal disapational ability to survive. This is compounded by the small size & Fet package in RC controllers.(I'll not scare any one with a photo of an exploded controller
)
I won't say you can't build a nice reliable RC set up....You Can....I am saying that I can't trust a singe hv160 to perform reliably within my objective.
The larger 80mm motors arent so forgiving. After Burtie reported his motors seem to favor internal mounting, I started to reposition the halls about the can...& my 80mm motors are far more sensitive to position & timing changes...there are sections where it gets really wild results under load.....this all went away spaceing the halls out to 120 deg...& works = as well at 60deg. Burtie speculated the magnetic feild in the biger stator motor may be jumbling the signals of the closely spaced hall set up....I don't have any sophisticated equipment to measure any of that mojo...but the logic & results seem to support that theroy. I am up to load tesing on the bike with 60deg halls.....I just need to get through the 3 feet of snow outside
when Burties programable electronic timeing units are perfected, this will all become mute points & "old school" thinking :lol:
I have High Hopes for Jeremys simple controller design using the TO227 fet package...it should be able to withstand the abuse from the small high rpm motors at least 3x better than the T0220 fet infineons
You are running the Astro's IIRC? I havent seen a real solution to the Hall placment on those yet.
Call Out to DrewJet: How about an update on your Asto experimants...are you using halls on your Mnt bike?
JohnRobHolmes is close on having it figured out on his 12kw astro's.......The Astro's are a bit easyer on the controllers only being 4 pole motors (if I understand the phisics correctly) & The higer resistance Wye termination will also releive some stress regarding Phase current spikes.
I just recived a new (still cheap) Video camera so I will try to get something to show regarding halls/outrunners in the motor section in a few days.
That catches up every one on the ellectrical side of thud's shop.....got a few things brewing that will be fun to share when the timings right.
Have fun gang.
Oh yea, here is a video of the bike finaly
https://www.endless-sphere.com/forums/viewtopic.php?f=28&t=18578&start=75#p276042
:wink:
