Search found 13506 matches

by fechter
Jun 20 2019 8:00am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Nova Cruz Voloci Re-vamp
Replies: 185
Views: 22891

Re: Nova Cruz Voloci Re-vamp

Part of the magnet problem is the epoxy stuff they used gets much weaker when hot. The motor could probably take 60v if the motor stays cool. Simply using a different glue would probably help a lot, but removing the original glue would be difficult. I've seen motors with a band around the magnets. M...
by fechter
Jun 20 2019 7:56am
Forum: E-vents
Topic: Lost Sierra Races 2019, July 12-14
Replies: 23
Views: 1002

Re: Lost Sierra Races 2019, July 12-14

I got a tentative OK from the wifey, so I am planning to come. Hopefully I can stuff two bikes in the minivan.
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by fechter
Jun 20 2019 7:52am
Forum: Motor Technology
Topic: Motorpoles
Replies: 7
Views: 148

Re: Motorpoles

So for sure you have 20 magnet poles. Just wild guess you probably have 18 stator poles.
by fechter
Jun 20 2019 7:50am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 3714
Views: 256817

Re: Sur-Ron - New Mid drive Bike

I might have to try something like that. That would be good for my pedal bike too.
by fechter
Jun 19 2019 11:20pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 3714
Views: 256817

Re: Sur-Ron - New Mid drive Bike

I agree. If I could find something that worked better, I would probably use it. Bar end mirrors are out for me and would suck off road too. The problem is mounting them in a location where you can actually see behind you.
by fechter
Jun 19 2019 3:43pm
Forum: Motor Technology
Topic: Dumb question about BLDC motor voltage
Replies: 11
Views: 173

Re: Dumb question about BLDC motor voltage

If I limit the current on my bench power supply and hook it up to a low resistance load, the voltage across the load will sag down to what would generate the desired current according to Ohms law. Would not the same happen (at least up to the speed where BEMF exceeds rated voltage) in a motor that ...
by fechter
Jun 19 2019 3:27pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 3714
Views: 256817

Re: Sur-Ron - New Mid drive Bike

I need something like that to see behind me mainly for the police. I once must have had police tailing me for a long time and didn't realize it until they pulled up ride beside me. I had the same issue. I have mirrors already and they have a pretty decent view, but you have to look at them once in ...
by fechter
Jun 19 2019 7:53am
Forum: E-Vehicles General Discussion
Topic: Is this corrosion in my hub motor?
Replies: 7
Views: 166

Re: Is this corrosion in my hub motor?

It won't hurt to put a bead of silicone on the cover when you reinstall it. I'd guess most of the water came in along the wires though.
by fechter
Jun 18 2019 2:09pm
Forum: E-Vehicles General Discussion
Topic: Is this corrosion in my hub motor?
Replies: 7
Views: 166

Re: Is this corrosion in my hub motor?

Should I be worried? And how did this happen? Yes. Water got in somehow and stayed there. Most commonly water enters along the wires going through the axle. Once it gets inside, it is hard for it to get out and you get corrosion. The routing of the wires going into the axle is very important. The w...
by fechter
Jun 18 2019 12:36pm
Forum: Motor Technology
Topic: Motorpoles
Replies: 7
Views: 148

Re: Motorpoles

Efu wrote:
Jun 18 2019 11:06am
Apply 5v to one hall? Can i use gnd and 5v in(on all 3 hall) and meassure on one signal line?
Sorry for confusion.
Yes. Typically all 3 have the same power wires. Then just measure one signal as you make a revolution.
by fechter
Jun 18 2019 12:27pm
Forum: E-vents
Topic: Lost Sierra Races 2019, July 12-14
Replies: 23
Views: 1002

Re: Lost Sierra Races 2019, July 12-14

I'd love to come but not sure the wife will let me. Yes, I have a Sur-ron and several ebikes.

Where does everybody stay?
by fechter
Jun 18 2019 8:30am
Forum: E-Bike Non-hub Motor Drives
Topic: Definite guide to suppress BB creacking noise with mid drive kits
Replies: 7
Views: 322

Re: Definite guide to suppress BB creacking noise with mid drive kits

I guess it depends on how much play you need to fix. Something like epoxy would work but you would have a really hard time removing the motor if needed. Another possible option would be some cone washers at either end that will wedge into the ends of the BB. Something that resembles the plastic wash...
by fechter
Jun 18 2019 8:10am
Forum: Motor Technology
Topic: Motorpoles
Replies: 7
Views: 148

Re: Motorpoles

There are many possible configurations so just feeling the cogging won't tell you enough. You could apply 5v or 9v to one of the hall sensors and put a meter on the signal line, then count how many times it toggles in one revolution. This would tell you how many magnets there are. It has to be an ev...
by fechter
Jun 18 2019 8:06am
Forum: General Discussion
Topic: Steampunk Voltmeter?
Replies: 12
Views: 274

Re: Steampunk Voltmeter?

The open view of the meter shows it will not work like a typical voltmeter. It's more of an ammeter. If the heavy copper wire coil was replaced with a zillion turns of much smaller wire, then it might function as a voltmeter. You can make an expanded scale voltmeter by using a zener diode as you sug...
by fechter
Jun 17 2019 7:54pm
Forum: Technical Reference Area
Topic: Using EV Chargers
Replies: 71
Views: 1806

Re: Using EV Chargers

I want to see the 50kw barbecue. :twisted:
by fechter
Jun 17 2019 2:01pm
Forum: E-Bike Technical
Topic: LCD display problem
Replies: 6
Views: 143

Re: LCD display problem

It's highly unlikely you can get just the display. You would probably have to get a whole new controller with a display. Since you took it apart and the insides are dried out, it might start working again. Next time anything electronic gets wet, disconnect the battery as soon as possible and let thi...
by fechter
Jun 17 2019 1:55pm
Forum: E-vents
Topic: Lost Sierra Races 2019, July 12-14
Replies: 23
Views: 1002

Re: Lost Sierra Races 2019, July 12-14

devo1223 wrote:
Jun 17 2019 11:54am
3559 Beckwourth Calpine Rd, Beckwourth, CA 96129
OK, thanks for posting that. On Google street view, it looks like out in the middle of nowhere. Could become the next Burning Man.

Burning Bike?
by fechter
Jun 17 2019 1:49pm
Forum: E-Bike Non-hub Motor Drives
Topic: Definite guide to suppress BB creacking noise with mid drive kits
Replies: 7
Views: 322

Re: Definite guide to suppress BB creacking noise with mid drive kits

Another option would be to pull the drive out and drill and tap some holes in the bottom bracket and install set screws. Tighten the set screws after reinstalling the drive. Loctite on everything.
by fechter
Jun 17 2019 10:20am
Forum: E-Bike Non-hub Motor Drives
Topic: BBS01B 36V 250W - trying with higher voltage [success]
Replies: 54
Views: 4805

Re: BBS01B 36V 250W - trying with higher voltage [success]

Thank you Wizzeros for the info. I tried to keep it simple. I moved the brown wire and TVS Diode outside the cable to keep it away from the other wires due to possible heat concerns. I then covered the diode with heat shrink wire wrap. I ran this setup for about 15 minutes with no detectable heat p...
by fechter
Jun 15 2019 10:08am
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 1343
Views: 61309

Re: la Nina rears her ugly head

Back to "normal" weather here for at least the next week. Now I have to do a bunch of yard work that I put off during the heat wave.
by fechter
Jun 15 2019 10:05am
Forum: E-Bike Non-hub Motor Drives
Topic: BBSHD Voltage Problem Firmware Update & Instructions
Replies: 70
Views: 3124

Re: BBSHD Voltage Problem Firmware Update & Instructions

Or maybe try to ask bafang support for the correct firmware while explaining your situation. Luna cycle, arguably their largest single customer has been trying to do this for a long time without success. It's like Bafang doesn't even know or doesn't care. There is no way to read the firmware from t...
by fechter
Jun 14 2019 3:59pm
Forum: E-vents
Topic: Lost Sierra Races 2019, July 12-14
Replies: 23
Views: 1002

Re: Lost Sierra Races 2019, July 12-14

So exactly where is this event going to be? From what I could read, it's in Beckwourth, CA, but not really sure.
by fechter
Jun 14 2019 3:50pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 340
Views: 14638

Re: APL's DIY axial-flux motor

I think a single cut will be fine. There isn't much stress on that area. Most of the force is sideways. Epoxy in the cut is a good idea.
by fechter
Jun 14 2019 12:43pm
Forum: Items Wanted
Topic: Meanwell S-350-24 or 48 volt DC power supply
Replies: 6
Views: 475

Re: Meanwell S-350-24 or 48 volt DC power supply

The Meanwell HLG series is made to run continuously at the current limit and it's adjustable, so should be a winner. They also have a great track record. The first one can most likely be made for adjustable current, but the circuit layout is probably unique and would need to be traced out to find wh...
by fechter
Jun 14 2019 12:36pm
Forum: Battery Technology
Topic: Build a mini USV/UPS
Replies: 32
Views: 527

Re: Build a mini USV/UPS

These little boards claims 4A output. Sure this is chinese amps, and it will not work converting 5V to 30V@4A, as it's the input current AND the output current that count. But if you say your working battery range is from 9V to 12V and your output is 2A@12V you should be fine. You can then decide i...