Search found 24363 matches

by amberwolf
Jan 17 2019 1:14am
Forum: E-Bike Technical
Topic: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier
Replies: 814
Views: 90346

Re: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier

After I paralleled the throttles and did basic testing to verify operation, I took a lunch break and painted S.B. Cruiser on the left side of teh cargo pod, along with a big pawprint, as steadily as I could (not very) with the smallest brush I had. I had some fabric paint handy, so that's what I use...
by amberwolf
Jan 16 2019 9:47pm
Forum: General Discussion
Topic: Unicorn Motor Controller
Replies: 3
Views: 58

Re: Unicorn Motor Controller

I'd just use the wheelchair motors you already have--in bursts you can run them at much higher power levels than what they are rated at, using double the original voltage, and if you have three pair then when you burn one out you can just swap them. :) If they're not enough, you can get bigger power...
by amberwolf
Jan 16 2019 9:27pm
Forum: E-Bike Technical
Topic: Replacement Hall sensors in BLDC hub motors
Replies: 14
Views: 1514

Re: Replacement Hall sensors in BLDC hub motors

markz wrote:
Jan 16 2019 2:32pm

I try to get as close as I can to the SS41, so even though the first one, on the left is cheapest, I dont think it would work because of the 7V,
Why not? Are you powering it from more than that?
by amberwolf
Jan 16 2019 9:23pm
Forum: E-Bike General Discussion
Topic: longer range (over 100 yards) wireless vibration alarm?
Replies: 3
Views: 82

Re: longer range (over 100 yards) wireless vibration alarm?

I don't know all of what's in there, but there's a thread about various GPS / alarm / lock / etc stuff that might help: https://endless-sphere.com/forums/viewtopic.php?f=3&t=71548 There are also a number of threads about antitheft devices/etc https://endless-sphere.com/forums/search.php?keywords=the...
by amberwolf
Jan 16 2019 9:17pm
Forum: E-Bike General Discussion
Topic: 29" e-bike for commuting - rear hub motor or TSDZ2 ?
Replies: 6
Views: 149

Re: 29" e-bike for commuting - rear hub motor or TSDZ2 ?

I'd go with a middrive for that kind of terrain and speeds and wheel size and weight, etc. Which middrive...I don't have any direct experience with any of the commercial ones, but others will likely step in with opinions on them.
by amberwolf
Jan 16 2019 9:08pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Error code 4,2 KEB - please help
Replies: 2
Views: 44

Re: Error code 4,2 KEB - please help

There's apparently a number of issues with cyclone motors and halls, because of the way they're designed. There are some posts about it in various cyclone threads. The link below lists the posts with both words, but not all of them will be relevant; you'll have to poke thru them to find the ones tha...
by amberwolf
Jan 16 2019 8:45pm
Forum: Battery Technology
Topic: LFP mobile House bank - xSyP serial vs parallel design thoughts
Replies: 33
Views: 495

Re: LFP mobile House bank - xSyP serial vs parallel design thoughts

So in parallel. With both lead and LFP? Any battery will eventually become the same voltage if you parallel them. It doesn't necessarily mean they will be balanced for capacity, as that depends on the SoC curve of the specific cell/chemistry and the voltage they're at. For example, 3.2v on LiFePO4 ...
by amberwolf
Jan 16 2019 8:20pm
Forum: E-Bike Technical
Topic: [Help Requested] Reverse-Engineering an undocumented conversion kit
Replies: 4
Views: 100

Re: [Help Requested] Reverse-Engineering an undocumented conversion kit

As I write this, I've had an idea - what if I hooked the hall sensors in the motor up to an oscilloscope and looked at how they triggered during one complete rotation of the wheel. Would it be possible to calculate the appropriate P1 value from that? Sorry, I have no idea, because I don't know what...
by amberwolf
Jan 16 2019 4:14pm
Forum: Battery Technology
Topic: LFP mobile House bank - xSyP serial vs parallel design thoughts
Replies: 33
Views: 495

Re: LFP mobile House bank - xSyP serial vs parallel design thoughts

The main thing that will help minimize this is to ensure all the cells you use are well-matched, so that they all have the same capacity and same internal resistance at all the states of charge, etc. Yes, in fact the use of routinely using per-cell charging as with BC168 seems attractive, as well a...
by amberwolf
Jan 16 2019 3:56pm
Forum: Battery Technology
Topic: LFP mobile House bank - xSyP serial vs parallel design thoughts
Replies: 33
Views: 495

Re: LFP mobile House bank - xSyP serial vs parallel design thoughts

At a low voltage like 4S, variations in voltage would be easy to spot at the string-unit level. No, because the strings are all in parallel, so all the *string* voltages are exactly the same. If a string has a cell that drops in voltage then current pours out of the *other* strings *into* this stri...
by amberwolf
Jan 16 2019 3:53pm
Forum: Battery Technology
Topic: LFP mobile House bank - xSyP serial vs parallel design thoughts
Replies: 33
Views: 495

Re: LFP mobile House bank - xSyP serial vs parallel design thoughts

Two separate intra-pack wiring configurations: A. the set connected in series, both sets at ~12V B. in parallel, 1B @2V, 2B @3.2V nominal. Sitting isolated overnight, which of the four sets (if any) will approach getting to balance on their own? None. LFP will not self-balance, period. If in "B." y...
by amberwolf
Jan 16 2019 3:32pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1398
Views: 162987

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

FWIW, I tend to agree that many of the Chinese ebike parts (and probably a lot of other stuff) do not have appropriately tested ratings. Some of them seem to have guesstimates based upon whatever the company that they mostly cloned their own design from said theirs was good for (even if *that* compa...
by amberwolf
Jan 16 2019 3:23pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1398
Views: 162987

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

The MXUS 3kW is a fine example of overrating because the dyno was done with a 20" wheel to exaggerate it's capabilities. In a 26" wheel, it is more like a 2250w continuous motor despite it's extra width due to the sloppier windings and possibly lower quality materials. Definitely lower quality mate...
by amberwolf
Jan 16 2019 3:22pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1398
Views: 162987

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

The problem with smaller spokes is the interface between the hub and the spokes. I've built 2 500-750w geared motors with standard 14 gauge spokes, and even that power level had them pinging and loosening from the get go. Strange...what kind of rims were used? I haven't seen these kinds of problems...
by amberwolf
Jan 16 2019 2:36pm
Forum: E-Bike Technical
Topic: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier
Replies: 814
Views: 90346

Re: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier

looks like no need for diodes or resistors: https://endless-sphere.com/forums/viewtopic.php?f=4&t=37964&start=3000#p1130299 That would also work just great. There is no problem at all parallel connecting two throttles together and combining their outputs. Since the throttle output signal can source ...
by amberwolf
Jan 16 2019 1:10pm
Forum: General Discussion
Topic: Telescope design; eliminating mirror-support diffraction
Replies: 9
Views: 251

Re: Telescope design; eliminating mirror-support diffraction

Reflection definitely isn't the issue, because this happens to open-frame telescopes as well, so no kind of coating would help (nothing to coat). Besides, if it was the issue, the large astronomical observatories would most certainly have fixed it one way or another long ago, since it's a relatively...
by amberwolf
Jan 16 2019 3:12am
Forum: Battery Technology
Topic: LFP mobile House bank - xSyP serial vs parallel design thoughts
Replies: 33
Views: 495

Re: LFP mobile House bank - xSyP serial vs parallel design thoughts

Another issue with series first then parallel is that if you have nothing to disconnect strings from each other automatically upon any cell imbalance, and if you are not monitoring all individual cell voltages, is that if a cell begins to become imbalanced, either high or low, the other cells in the...
by amberwolf
Jan 16 2019 2:43am
Forum: General Discussion
Topic: Telescope design; eliminating mirror-support diffraction
Replies: 9
Views: 251

Re: Telescope design; eliminating mirror-support diffraction

I appreciate the extra info about the secondary causing diffraction; that's something no one pointed out to me yet. As my previous post states, though my original post did not (my mistake), the purpose of the idea is for large (huge) astronomical telescopes, not personal ones. Like the Hubble space ...
by amberwolf
Jan 16 2019 2:06am
Forum: E-Bike General Discussion
Topic: Soldering novice: charger wire to BMS board
Replies: 8
Views: 123

Re: Soldering novice: charger wire to BMS board

Can I just take a drill, core out the circle and the little fragment of wire embedded in it, then put my wire into the copper circle's hole? If there are multiple layers to the board and anything else connects there, that will destroy the connection, so no, I wouldn't do that, unless you are absolu...
by amberwolf
Jan 16 2019 12:39am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1398
Views: 162987

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

Make sure to lace all the spokes outside the hub flanges Would that also be recommended for wider-flanged hubs (like the MXUS 450x) in smaller rims (20" bicycle / 16" motorcycle)? I ask because it would force teh spoke to have to bend around the flange significantly. I'm not sure how much of a stre...
by amberwolf
Jan 16 2019 12:29am
Forum: General Discussion
Topic: Telescope design; eliminating mirror-support diffraction
Replies: 9
Views: 251

Re: Telescope design; eliminating mirror-support diffraction

Me and math don't really get along, and I have no idea how to calculate out anything like this. :oops: But...you could be right. I have seen a few old harddisk systems the size of washing machines that used a magnetically-suspended and positioned arm/head mechanism, but the distances between outer a...
by amberwolf
Jan 15 2019 11:44pm
Forum: E-Bike Technical
Topic: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier
Replies: 814
Views: 90346

Re: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier

Been an exhausting workweek...but I've determined that my first priority tomorrow (first day off) will be to create a throttle bypass around the CA, so the throttle on the handlebars goes direct to the controller, while leaving the PAS still able to control the throttle output of the CA that also go...
by amberwolf
Jan 15 2019 10:54pm
Forum: General Discussion
Topic: Fiat Chrysler pays millions...
Replies: 14
Views: 185

Re: Fiat Chrysler pays millions...

I first came to Los Angeles in 1978 as a kid. You could see the line where the smog began. Once you descended below the line, you immediately smelled the stink and visibility was reduced to a few miles. I went to KG & early gradeschool Huntington Beach until a couple years before that, and I rememb...
by amberwolf
Jan 14 2019 10:47pm
Forum: Battery Technology
Topic: Zero motorcycle 2.8 battery question
Replies: 2
Views: 100

Re: Zero motorcycle 2.8 battery question

If you can read voltage from those two pins without connecting anything else, then you could also charge it thru them. If you get no voltage (or no stable voltage) there, then you'd have to find out which of the small pins on that Anderson connector are used to enable the battery input (and output)-...