How to bypass internal controller on brushless motors?

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august23   10 W

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Re: How to bypass internal controller on brushless motors?

Post by august23 » Aug 18 2012 9:43pm

for those of you who have been following this discussion, here is the HowTo I made for bypassing the MAC/BMC
http://endless-sphere.com/forums/viewto ... 30&t=39262

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def215   10 kW

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Re: How to bypass internal controller on brushless motors?

Post by def215 » Aug 21 2012 5:17pm

i have a bmc that is sitting in my lap at the moment that im trying to get running. at the moment, im trying to get my hall placement correct to run on this hua tong controller i got from ebay. at the moment i suspect that this controller wont accomodate this motor since the hall spacing is 120 or 60 degrees. it spins up for me but it seems to draw too much current past 1/2 throttle and surges like it wants to go full throttle.
this is what i have as of now.
the motor:
Image
close up of my hall placement(im pretty sure itheyre in the wrong place, so feel free to give me a stern talking to for that one and correct me. :oops: ):
Image
and this is the controller im running:
Image
its a hua tong 250w 24v brushless controller.

can anyone give me any tips or pointers how to get this running correctly? mrbill? fechter? knoxie? anyone? i looked at mrbill's thread and his website and i tried to place my halls in the same place he has, and my motor wont even turn on my controller. ive been fiddling with hall placement to get it to spin up and ive been getting mixed results. :roll:
Project: E-BMX - Completed, debugging.
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august23   10 W

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Re: How to bypass internal controller on brushless motors?

Post by august23 » Aug 23 2012 12:46am

well, First off, I wouldn't bother trying to get it to work with that controller as it's rated far lower than what these motors will put out. But I understand the need to keep things cheap. have you looked at this thread? http://endless-sphere.com/forums/viewto ... 28&t=20910

I will be curious to see you figure it out though. keep at it.

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def215   10 kW

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Re: How to bypass internal controller on brushless motors?

Post by def215 » Aug 23 2012 12:38pm

i realized that i had a hall flipped upside down. :oops: but the spacing that mrbill is using us working for me now, well its still on and off, im trying to position my halls to where it will run smooth. i got it to the point where ive been able to run it at full throttle, but it pulls about 3 amps and i think thats normal. if i recall, others have got similar no load amps on their bmc;'s but ive been reading the data for both 300w and 600w options.

right now, i really want this to work since i fried the 250w 24v currie motor on my current ebike. i just hope i can do it soon.
Project: E-BMX - Completed, debugging.
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august23   10 W

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Re: How to bypass internal controller on brushless motors?

Post by august23 » Aug 23 2012 12:53pm

I'm selling my 600w w/controller (lynn controller). I bypassed it. should work on your setup.

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def215   10 kW

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Re: How to bypass internal controller on brushless motors?

Post by def215 » Aug 24 2012 9:20am

i have a feeling it could be pricey for a lyen controller and bypassed 600w bmc. ill see what i can do with my 300w bmc and controller at the moment. right now, i just blew 2 phases on my controller due to my error of a hall sensor getting knocked out of place and being at full throttle. i have replacement FET's on the way which should be here in the next week. but i think i almost have it in running order. :D but if all else fails, ill look for a completely new motor setup.

another question, do the hall sensors have a specific position besides being in the middle of a stator tooth and spaced 3 teeth apart on either side? like, should it be near the start or the finish of a phase, or something like that?
Project: E-BMX - Completed, debugging.
Konion Powered!
http://endless-sphere.com/forums/viewtopic.php?t=14550

Project Min-E Ped:
http://endless-sphere.com/forums/viewto ... 35&t=25636

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