geetarboy
100 W
God! What a fun looking ride, Great work Luke!
bigmoose said:Two nice things about the sin/cos sensor:
- It get the position sensing element out of the stator heat flux
- It allows precise timing advance with the right controller just like a timing map in an IC ECM
liveforphysics said:This motor fitted with external sine/cosine rotor position encoder:
http://www.goldenmotor.com/HPM-10KW%203D.jpg
The video text says that Ryan added a sin/cos encoder...does this encoder translate into the typical 3-hall signal output, or does it just go into the controller itself as sin/cos instead? (I would bet the latter but am hoping for the former)liveforphysics said:A bicycle worthy of my commute.
Another motor's built-in sin/cos sensor and magnet ring, also kept away from the potentially hot stator and magnets:RWP said:What is a sine/cosine rotor position encoder?
How does it work? Can a mere mortal make one?
I like pictures :lol:
It is so so so exciting to be in the middle of all this EV stuff just taking off! And bigmoose you deserve so much for all your help, as do many others incl luke him self! I have never been so excited for something in my life. This whole thing is the reason I can't wait to get up and go see what I can learn on my computer in the morning! 2012 is going to be a HUGE year for extreamly fast ebikes!bigmoose said:Two nice things about the sin/cos sensor:
- It get the position sensing element out of the stator heat flux
- It allows precise timing advance with the right controller just like a timing map in an IC ECM
RWP said:I found some individual encoder chips on line.
Is it a trivial thing to mount them like we do hall's, or is this not possible?
OH...a $50 encoder...good enough!
Thanks Luke - You da MAN for your manly bike!!!liveforphysics said:You gotta drill a pocket into the back of the motor shaft for the encoder magnet to get glued in. Then just some structure you can afix the encoder package to sit over that magnet. Then you need to clock the encoder to be aligned properly, which requires an o-scope tinkering. Then you make sure you've got which is which for sine/cosine sorted out, send that to the sevcon's encoder input, and you're ready to begin configuring the sensor to the controller and start dyno tuning.RWP said:I found some individual encoder chips on line.
Is it a trivial thing to mount them like we do hall's, or is this not possible?
OH...a $50 encoder...good enough!
No, not if you're talking about common ebike controllers like the Infineon/Lyen/Crystalyte/Ecrazyman/XieChang stuff; that's the problem I am asking about in my post on the previous page and in my powerchair thread.RWP said:OK then...is the encoder signal anything like a hall signal that would connect to a controller that is more common to what we are currently using?
Jozzer said:
Whiplash said:Hey Luke,
just a crazy question, what would you need to get to setup a drive system like this, say if one of us sent you the motor/controller and had you set it up similarly? I would LOVE to build a frame and just be able to slap a drive into it like this!!
Ypedal said:I think u should have to earn this the hard way!
Ypedal said:I think u should have to earn this the hard way!