Search found 14862 matches

by fechter
Apr 19 2021 2:01pm
Forum: EBike Build Threads
Topic: Your Creation's Before & After Pics
Replies: 1929
Views: 708666

Re: Your Creation's Before & After Pics

Nice side car! I like the Impala hood ornament. Those may be quite valuable and prone to theft.

I could imagine putting a second hub motor on the side car and lots of batteries inside.
by fechter
Apr 17 2021 11:18am
Forum: Large EV General Discussion
Topic: Destruction Derby Car Build
Replies: 12
Views: 202

Re: Destruction Derby Car Build

Those wheel motors don't look too bad. 8kW each should at least move a car. A very stripped down, lightened car would go a lot faster. For sure those would be the most flexible for mounting and could work on almost anything.
by fechter
Apr 16 2021 2:54pm
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 28
Views: 539

Re: DIY Toroidal Axial Flux PM

Looking nice! If you made the slots narrow right at the top, you'd have to stuff the wires through the narrow part when winding but it would help keep the copper in place after it was wound. Old-school brushed motors often had "keepers" made of stiff fish paper that slid over the copper an...
by fechter
Apr 16 2021 2:39pm
Forum: Large EV General Discussion
Topic: Destruction Derby Car Build
Replies: 12
Views: 202

Re: Destruction Derby Car Build

Just get the whole power train from a Leaf or other available EV. Maybe find one that was rear-ended. The batteries on those are the first thing to get recycled, so I'm sure you'd have to find a battery separately. If you only need 10 miles range, a much smaller battery will work. No matter what, it...
by fechter
Apr 16 2021 1:33pm
Forum: Battery Technology
Topic: Using a lead acid charger on a Lithium pack
Replies: 7
Views: 174

Re: Using a lead acid charger on a Lithium pack

And doesnt the BMS control that at stop it from charging that high? Maybe, maybe not. The BMS shouldn't be relied upon to control the charging end point. It is there as a safety backup if the charger fails. If the BMS doesn't cut off at 4.2v on a cell, you run the risk of pack fire. Many chargers h...
by fechter
Apr 16 2021 12:52pm
Forum: EBike Troubleshooting
Topic: Bms help.
Replies: 5
Views: 109

Re: Bms help.

Sure looks like a 17s board.

It will probably work by taking the cell 16 and cell 17 connections and tie them together. You just don't want to leave any wires floating.
by fechter
Apr 15 2021 8:59am
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 2062
Views: 144963

Re: la Nina rears her ugly head

Not a drop here. Still sitting at 10.5" for the year. Forecast high this weekend over 80F. Time to get out and enjoy before the fires start.
by fechter
Apr 11 2021 4:06pm
Forum: Motor Technology
Topic: Power Spikes - Modifying Ninebot Controller
Replies: 17
Views: 4383

Re: Power Spikes - Modifying Ninebot Controller

Disconnect the motor wires and measure resistance between the wires (all combinations). A shorted FET will give you a short between a pair of motor wires. Good FETs will measure like a diode, near shorted in one direction and open in the other direction.
by fechter
Apr 10 2021 11:06am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1477
Views: 130867

Re: APL's DIY axial-flux motor

Welcome! Nice looking stators. You have even more iterations than APL.

Now we need to figure out how to 3D print that SMC magnetic stuff.
by fechter
Apr 10 2021 11:01am
Forum: EBike Build Threads
Topic: A2B Metro (Gen 1) Restoration and Upgrade
Replies: 82
Views: 3128

Re: A2B Metro (Gen 1) Restoration and Upgrade

Yes, the A2B Excel was labelled/sold as an 'Electric Scooter' and appears to have been fitted with an 800W version of the UltraMotor. I guess the controller was in the frame: It says main battery 48v, so that's how they got more power. I ran mine at 52v for a year before I did the external controll...
by fechter
Apr 08 2021 10:19pm
Forum: EBike Build Threads
Topic: A2B Metro (Gen 1) Restoration and Upgrade
Replies: 82
Views: 3128

Re: A2B Metro (Gen 1) Restoration and Upgrade

Cool, I've never seen one like that. Around here it would be legal on the street, but not on the trails. You'd be sort of screwed with that one if you hit any kind of hills like I deal with. Great for flat ground.
by fechter
Apr 07 2021 9:45pm
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 2062
Views: 144963

Re: la Nina rears her ugly head

Still sitting at 10.5" for the season. The hills are looking about as green as they're going to get right now. It will be all brown pretty soon.
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by fechter
Apr 07 2021 11:17am
Forum: EScooters/EMotorcycles
Topic: Looking for featherweight geared hubmotors, >10kW
Replies: 35
Views: 1300

Re: Looking for featherweight hubmotors, >10kW

That sounds pretty close to a Sur-ron motor. Not a hub motor, but they have a good track record. I could not find specifications ....I send them an e-mail.....do you have the specifications?.... Check out this page: https://www.sur-ron.com/us/power.html Keep in mind the power rating of an electric ...
by fechter
Apr 05 2021 11:50pm
Forum: EScooters/EMotorcycles
Topic: Looking for featherweight geared hubmotors, >10kW
Replies: 35
Views: 1300

Re: Looking for featherweight hubmotors, >10kW

meddesign wrote:
Apr 05 2021 9:02pm
I am looking for 6000 rpm 15-20kw for a 32" prop....any suggestion on a DD hub motor? This is for a Ultra-Lite Power launch glider
That sounds pretty close to a Sur-ron motor. Not a hub motor, but they have a good track record.
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by fechter
Apr 05 2021 1:45pm
Forum: Motor Technology
Topic: Car alternator to PMAC?
Replies: 35
Views: 1073

Re: Car alternator to PMAC?

I was able to set my falling edge and rising edge on the zero crossing of my sensor signal. How do I find stator U to Rotor Sensor U by test. Unfortunately, this varies depending on what controller you are using. They are not consistent about the labeling. The only way I know is to trial-and-error ...
by fechter
Apr 05 2021 7:57am
Forum: General Discussion
Topic: Just had an earthquake in Los Angeles
Replies: 139
Views: 17335

Re: Just had an earthquake in Los Angeles

Bet that one woke up a lot of people.
by fechter
Apr 04 2021 6:30pm
Forum: EScooters/EMotorcycles
Topic: Sur-Ron - New Mid drive Bike
Replies: 5427
Views: 621151

Re: Sur-Ron - New Mid drive Bike

150 ohms not 15. 1/2 w should be good.
by fechter
Apr 04 2021 11:51am
Forum: EBike Build Threads
Topic: A2B Metro (Gen 1) Restoration and Upgrade
Replies: 82
Views: 3128

Re: A2B Metro (Gen 1) Restoration and Upgrade

I replaced the freewheel on mine with a new one that was the same tooth count as the original. I really can't hear it much. You really want the pedals to work if you want to avoid issues with stupid cops. Also handy when the electric drive fails. On mine, I can assist the motor up to about 20mph in ...
by fechter
Apr 04 2021 11:41am
Forum: EScooters/EMotorcycles
Topic: Sur-Ron - New Mid drive Bike
Replies: 5427
Views: 621151

Re: Sur-Ron - New Mid drive Bike

I have what look like the same signal lights. I had to place a load resistor across the amber input to ground to make the flasher work. I think I used 150 ohm resistors. It's pretty common to need load resistors when using LED lights with a flasher. My load resistors were installed in the rear signa...
by fechter
Mar 30 2021 11:53pm
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 2062
Views: 144963

Re: la Nina rears her ugly head

Forecast high tomorrow 84. Several cities nearby are expected to break records. There is a slight chance for rain after the weekend. The warm weather is nice except all the plants are flowering early and the pollen is really thick. Stuff that makes you dizzy. Fire season is already here in South Dak...
by fechter
Mar 30 2021 2:39pm
Forum: EScooters/EMotorcycles
Topic: Sur-Ron - New Mid drive Bike
Replies: 5427
Views: 621151

Re: Sur-Ron - New Mid drive Bike

Oh one thing, the charger that I have doe's not have an on/off switch, as soon as you plug it in the power is on, will this make a difference to the steps you suggested? No, other than instead of turning "turning on main power", you simply plug in the charger. My charger doesn't have a sw...
by fechter
Mar 30 2021 8:12am
Forum: EScooters/EMotorcycles
Topic: Sur-Ron - New Mid drive Bike
Replies: 5427
Views: 621151

Re: Sur-Ron - New Mid drive Bike

New member here; I have just a couple of questions, My Sur-Ron battery died ( will not power the bike & no readout on the screen). Try this before giving up: Awaking the Battery after Auto-Sleep mode: 1. Plug the charger into the Main power. Do not turn on the charger, then insert the charger i...
by fechter
Mar 30 2021 8:08am
Forum: EBike General Discussion
Topic: How To, 50A BBSHD Controller Mod
Replies: 275
Views: 58853

Re: How To, 50A BBSHD Controller Mod

30h is a communication failure. The display is unable to communicate with the controller. Hard to say what caused that, I would carefully check the connections between controller and display. Look for bent pins. 12h is a current sensor fault, indicating the current signal voltage coming from the shu...
by fechter
Mar 27 2021 12:30pm
Forum: Motor Technology
Topic: Car alternator to PMAC?
Replies: 35
Views: 1073

Re: Car alternator to PMAC?

Not good. Capacitors won't fix that problem. The flux it getting pulled to one side at high currents. Most motors have the hall sensors mounted at the end of the slot, not in the middle. Since the rotor teeth are skewed, this might be hard to make work also. You may need to use a separate encoder, e...
by fechter
Mar 26 2021 10:08am
Forum: EScooters/EMotorcycles
Topic: Sondors x new bike the Metacycle
Replies: 63
Views: 2144

Re: Sondors x new bike the Metacycle

They don't seem to understand electricity much.
The motor is capable of 20hp and 8kWh and a top speed of 80mph. The motor can be pushed further for a peak power of 14.5kWh.
I'm still waiting for someone (we trust) to actually test one before throwing it under the bus.