Search found 11993 matches

by fechter
Apr 23, 2018 3:15 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 973
Views: 49551

Re: Sur-Ron - New Mid drive Bike

Sweet! Not exactly plug and play, but with enough work... The smaller ones might be the same as stock. Interesting they say the controller is FOC. SUR-RON-C2-SERIES.jpg Rated Voltage 60 V Operating Voltage Range 36 V ~ 100 V Continuous Output Power (60 min) 16 kw Peak Output Power (2 min) 28 kw Spee...
by fechter
Apr 23, 2018 3:08 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Throttle Behavior
Replies: 64
Views: 1628

Re: Throttle Behavior

Good deal. You get to be the guinea pig.. What works nice is to have the pot hanging out on long wires so you can adjust while testing, then once you get it all dialed in, carefully disconnect the pot and measure the value with an ohmmeter. Then you know which fixed resistors to use in the future. I...
by fechter
Apr 23, 2018 2:55 pm
Forum: E-Bike General Discussion
Topic: Active pre-charge/inrush control
Replies: 706
Views: 58281

Re: Active pre-charge/inrush control

The footprint that I used for the PNP transistors is wrong, CBE instead of EBC, Q3, Q6 and Q8. That's why the protection was triggered, probably why it blew up too. I hate it when that happens... I'll be interested in the results. I took a stab at designing at a similar circuit using a FAN3224 dual...
by fechter
Apr 23, 2018 1:09 pm
Forum: Resources & EV Related Parts and Services
Topic: Throttles, connectors, accessories, - Where to buy them?
Replies: 25
Views: 16242

Re: Throttles, connectors, accessories, - Where to buy them?

What are the basic mechanisms behind thumb throttles? I wish to design and produce my own. Is it some kind of spring-loaded potentiometer? Most of them use a hall effect sensor and moving magnets. You can use a potentiometer as well, but those tend to have limited life as the wiper wears out. There...
by fechter
Apr 23, 2018 9:58 am
Forum: E-Bike Non-hub Motor Drives
Topic: Throttle Behavior
Replies: 64
Views: 1628

Re: Throttle Behavior

Unfortunately, I did not have time to test the circuit over the weekend. I looked around to see if there was a voltage detector that might work, and they do exist. A voltage detector will switch at a preset level and should be pretty immune to temperature changes. I found some that will trigger at 0...
by fechter
Apr 23, 2018 9:33 am
Forum: E-Bike Technical
Topic: What could be wrong with my bike?
Replies: 22
Views: 752

Re: What could be wrong with my bike?

Could it be a damaged phase wire? Or possibly a hall sensor which fails under high amps? I didn't think it was the battery as I don't have any more voltage drop than I would expect, does that rule it out? I don't think the hall sensors would fail only at higher motor currents. If the battery voltag...
by fechter
Apr 21, 2018 7:27 pm
Forum: E-Bike Non-hub Motor Drives
Topic: My Bafang Ultra Mountain Bike! Frey AM1000
Replies: 503
Views: 32361

Re: My Bafang Ultra Mountain Bike! Frey AM1000

For you guys that own a Ultra 1000 can you use the throttle and PAS at the same time. I know their's a big discussion on electricbike.com that the new BBSHD controllers are not able to use throttle and PAS at the same time. I'm working on a way to fix the BBSHD problem. Should know in a week or so.
by fechter
Apr 21, 2018 12:14 pm
Forum: E-Bike Reviews & Testing
Topic: A2B Metro - www.ultramotor.com - Video Page4
Replies: 405
Views: 63493

Re: A2B Metro - www.ultramotor.com - Video Page4

I checked the programming software and I don't see any settings for throttle range. Some other controllers have this. So the old school way to fix the problem is to place a 500 ohm trimmer pot in series with the throttle ground wire. With the wheel off the ground, you start at zero and increase the ...
by fechter
Apr 20, 2018 10:35 am
Forum: Battery Technology
Topic: Battery charge port:
Replies: 3
Views: 129

Re: Battery charge port:

garyal wrote:
Apr 19, 2018 2:58 pm
So I will just make sure and put a fuse inline with the jack I plug in so as to have over current protection.
That is a good idea.
by fechter
Apr 20, 2018 8:38 am
Forum: E-Bike Technical
Topic: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers
Replies: 115
Views: 3213

Re: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers

Awesome testing! Having real-life numbers for the fail points is priceless.

Having some way to keep the dropouts from spreading seems like it would be good.
by fechter
Apr 20, 2018 8:31 am
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 92
Views: 1429

Re: The ultimate torque arm (For <2kW and standard axles)?

I apologize for being bitchy and helping to derail this topic. Just some of your posts could be taken as personal attacks on other members, which is not allowed and doesn't help anything. It sounds like "I'm right and you're wrong because I have 40 years of experience", which is not a valid argument...
by fechter
Apr 19, 2018 1:22 pm
Forum: Battery Technology
Topic: Battery charge port:
Replies: 3
Views: 129

Re: Battery charge port:

Yes. I have tried it and it works. The charge port can't handle a lot of current, but the pump takes less than 2A. There is no protection for low battery or over current using that port, but it shouldn't be a problem for the amount of time it takes to pump a tire.
by fechter
Apr 19, 2018 1:18 pm
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 766
Views: 28133

Re: la Nina rears her ugly head

Our chance last night evaporated before it hit the ground, so zero in the rain gauge. Back to sunny, warm weather, which I am ready for.
by fechter
Apr 19, 2018 1:15 pm
Forum: Battery Technology
Topic: Supercapacitors vs batteries. Capacity.
Replies: 126
Views: 3239

Re: Supercapacitors vs batteries. Capacity.

Hillhater wrote:
Apr 18, 2018 6:27 pm
..if they are using those, then they have also invented "anti-gravity" !! :shock:
At 5.2 Wh/kg , it would need ~~ 700kg to give 3.55kWh capacity
I missed that. Well, I guess we can eliminate that possibility.
by fechter
Apr 19, 2018 1:11 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Throttle Behavior
Replies: 64
Views: 1628

Re: Throttle Behavior

I managed to find a small Darlington transistor and tested it. 2N5308. With a 100k base resistor, it turns on right around 1.15v. This is pretty close to the desired point. I think ideally we want it to turn on at 0.95v to 1.0v. One other thought I has was if you are pedaling and hit the throttle, t...
by fechter
Apr 19, 2018 9:23 am
Forum: E-Bike General Discussion
Topic: How To, 50A BBSHD Controller Mod
Replies: 171
Views: 13978

Re: How To, 50A BBSHD Controller Mod

racingame wrote:
Apr 18, 2018 6:45 pm
Sorry for the interference, but isn't "Ludicrous" version just a Luna internal name for a controller where they switched out the shunt (and maybe also replaced aluminum case IIRC)?
Yes. It may also have a steel gear instead of the plastic one.
by fechter
Apr 19, 2018 9:21 am
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 92
Views: 1429

Re: The ultimate torque arm (For <2kW and standard axles)?

Really reminds me of this story https://www.nytimes.com/2000/01/18/health/among-the-inept-researchers-discover-ignorance-is-bliss.html Anytime somebody starts bragging about how great they are, it's a red flag. What the members here have is a lot of practical experience, which I consider to be more ...
by fechter
Apr 19, 2018 9:09 am
Forum: E-Bike Reviews & Testing
Topic: A2B Metro - www.ultramotor.com - Video Page4
Replies: 405
Views: 63493

Re: A2B Metro - www.ultramotor.com - Video Page4

I'll have to find those settings on my old laptop. It might take me a while to dig them up. I think there is a setting for the throttle voltage but I don't recall having an issue with mine. Low throttle should be around 1.0v. If you see a setting for this in the programming, you want it to be lower....
by fechter
Apr 19, 2018 8:48 am
Forum: Stand-up E-scooters and E-skateboards
Topic: GOPED ESR750 Battery Question
Replies: 8
Views: 155

Re: GOPED ESR750 Battery Question

A custom 18650 pack would be fairly easy for someone with the right tools.

I think you want your pack to be able to supply 50A maximum current, not 50Ahr capacity (two different things).
by fechter
Apr 19, 2018 8:42 am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 973
Views: 49551

Re: Sur-Ron - New Mid drive Bike

The Husky looks like he has a rechargeable battery on his collar. Is he cheating?
by fechter
Apr 19, 2018 8:39 am
Forum: E-Bike Non-hub Motor Drives
Topic: Throttle Behavior
Replies: 64
Views: 1628

Re: Throttle Behavior

I should really try to do more testing, but I think a 100K trimmer would be better. Temperature drift might still be an issue since the controller heats up quite a bit as you ride, but I think it will be OK. When building, I recommend attaching the CCW leg of the pot to the ground side so that turni...
by fechter
Apr 18, 2018 11:21 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Throttle Behavior
Replies: 64
Views: 1628

Re: Throttle Behavior

I used a 2N5550 I just happened to have lying around and simulated that part of the circuit on a breadboard. The single 100k base resistor will be pretty close, but I don't know the exact threshold where the PAS will inhibit. I know what a pain it can be to dial in a pot. One reason I like the 10 tu...
by fechter
Apr 18, 2018 7:18 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Throttle Behavior
Replies: 64
Views: 1628

Re: Throttle Behavior

OK, good news on the testing. In reviewing the datasheet for the transistor, it seems the super simple circuit with one resistor might have issues with temperature drift. The first one with two resistors will be better in this respect. The easiest thing would be to use a 20k trimmer pot in place of ...
by fechter
Apr 18, 2018 2:35 pm
Forum: Stand-up E-scooters and E-skateboards
Topic: GOPED ESR750 Battery Question
Replies: 8
Views: 155

Re: GOPED ESR750 Battery Question

That battery is a little weak for the ESR750. Ad states 15A continuous. You should look for something that can do 50A. By replacing the lead bricks with lithium batteries, you could probably triple the range and reduce the weight quite a bit. What are the dimensions of the battery compartment? Or me...
by fechter
Apr 18, 2018 1:53 pm
Forum: Battery Technology
Topic: Supercapacitors vs batteries. Capacity.
Replies: 126
Views: 3239

Re: Supercapacitors vs batteries. Capacity.

Here is a datasheet from Maxwell for a new product they call a "Pseudocapacitor"
https://www.mouser.com/ds/2/257/CE_2017 ... 274211.pdf

These may be what they are using.
Pseudocap.JPG
Pseudocap.JPG (98.33 KiB) Viewed 47 times