Search found 12001 matches

by fechter
Apr 24, 2018 8:34 am
Forum: E-Bike Non-hub Motor Drives
Topic: G510 Bafang New Bicycle Build
Replies: 2
Views: 61

Re: G510 Bafang New Bicycle Build

Looks great.

Does that one have torque sensing?
by fechter
Apr 24, 2018 8:22 am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Nova Cruz Voloci Re-vamp
Replies: 86
Views: 13032

Re: Nova Cruz Voloci Re-vamp

Not sure exactly why the on board dc-dc quits at the higher voltage. It might be on the verge of blowing up. A separate dc-dc should work fine. You could go for a separate battery meter too. I have had good results with the little TK 15 units. These actually measure the amp-hours, so give you a pret...
by fechter
Apr 24, 2018 8:16 am
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 769
Views: 28204

Re: la Nina rears her ugly head

Sounds like La Nina is over and it's back to neutral conditions Most models in the IRI/CPC plume predict La Niña will decay and return to ENSO-neutral during the current March-May season [Fig. 6]. The forecaster consensus similarly favors a transition to neutral, with a continuation of ENSO-neutral ...
by fechter
Apr 24, 2018 8:05 am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 983
Views: 49880

Re: Sur-Ron - New Mid drive Bike

anybody found info on re calibrating the speedo with the different sprocket size? Not that I am aware of. It seems it gets the speed from the motor hall signals. There must be some kind of programming interface for the controller but I don't think anybody outside of SurRon has it. Plan B would be t...
by fechter
Apr 24, 2018 8:00 am
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 104
Views: 1635

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

You mean you engineering wizards can't work that out from the information given. Come on Chalo, now's the time to step up and show everyone your prowess. It's a simple calculation; just get the units right. Clipboard03.jpg Nowhere in this screen shot does it show where the 200N is applied nor does ...
by fechter
Apr 23, 2018 11:20 pm
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 104
Views: 1635

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

200 N That's not a torque, son. My thought also. In the diagram, it is not evident to me where this 200N is applied, so you need to help us out. I am interested in what the amount of torque would be at that stress for comparison reasons. I know how much torque my hub motor can make. I want to know ...
by fechter
Apr 23, 2018 7:19 pm
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 769
Views: 28204

Re: la Nina rears her ugly head

82 and sunny here today. I think it's close to a record. Slight chance of rain on the weekend.
by fechter
Apr 23, 2018 7:17 pm
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 104
Views: 1635

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

Buk___ wrote:
Apr 23, 2018 5:37 pm
Exactly as predicted (by me!) in both location and magnitude; and entirely within the proof stress of the material selected.

What was the axle torque to produce that stress?
by fechter
Apr 23, 2018 3:15 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 983
Views: 49880

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: 1701

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: 58357

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: 26
Views: 16274

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: 1701

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: 771

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: 505
Views: 32591

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: 63545

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: 134

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: 116
Views: 3302

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: 104
Views: 1635

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: 134

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: 769
Views: 28204

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: 3276

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: 1701

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: 14175

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: 104
Views: 1635

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 ...