Search found 4909 matches

by izeman
Oct 21 2019 9:44am
Forum: E-Bike Technical
Topic: Kelly Controller has no torque, jerks motor
Replies: 26
Views: 454

Re: Kelly Controller has no torque, jerks motor

You need a HOT AIR GUN. Heat the pcb and pins and the FETs will just fall out. Imho that's the only proper way to desolder them.
Then use a solder pump to clear the pcb holes, put in new FETs, solder them and you're done.
by izeman
Oct 09 2019 1:37am
Forum: E-Bike Technical
Topic: Kelly Controller has no torque, jerks motor
Replies: 26
Views: 454

Re: Kelly Controller has no torque, jerks motor

Yeah. Unfortunately genuine ones have their price. And that also makes clear that a ten pack for $2 can't be real.
You won't regret that purchase!
by izeman
Oct 04 2019 2:09am
Forum: E-Bike Technical
Topic: Kelly Controller has no torque, jerks motor
Replies: 26
Views: 454

Re: Kelly Controller has no torque, jerks motor

Just checked the video. This IS the correct way to do it. And he's not using continuity mode (open/closed loop), but diode testing mode.
by izeman
Oct 04 2019 2:08am
Forum: E-Bike Technical
Topic: Kelly Controller has no torque, jerks motor
Replies: 26
Views: 454

Re: Kelly Controller has no torque, jerks motor

I checked the FET you posted. IMHO one of the best replacements is the well trusted IRFB3077. An excellent FET with almost the same specs (Vmax=75V), but WAY lower RDSon of 3mO compared to 8mO. That means is dissipates about A TENTH of the heat the RJK type does. So your controller will stay cooler ...
by izeman
Oct 04 2019 2:01am
Forum: E-Bike Technical
Topic: Kelly Controller has no torque, jerks motor
Replies: 26
Views: 454

Re: Kelly Controller has no torque, jerks motor

No the method is fine. It will detect a DEAD FET. It's no proof that a good one is still good, but if one shorts it's dead for sure. A correct test would be to test forward voltage in diode testing mode of the desoldered FET. But they will be good for 99.9%. If you can't find the correct time you ma...
by izeman
Oct 03 2019 12:39pm
Forum: Battery Technology
Topic: BMS balance wire shorted. Likely damaged BMS, or still good to go?
Replies: 7
Views: 153

Re: BMS balance wire shorted. Likely damaged BMS, or still good to go?

How would this CAP test look like? Could you post a schematic? I don't see how connecting a capacitor between two balance wire would do anything helpful to test the BMS.
by izeman
Oct 03 2019 6:44am
Forum: Battery Technology
Topic: BMS balance wire shorted. Likely damaged BMS, or still good to go?
Replies: 7
Views: 153

Re: BMS balance wire shorted. Likely damaged BMS, or still good to go?

Most likely this will still work. But i wouldn't trust it w/o testing it in real life. A BMS you can't trust is worth NOTHING. :(
by izeman
Oct 03 2019 6:42am
Forum: E-Bike Technical
Topic: Kelly Controller has no torque, jerks motor
Replies: 26
Views: 454

Re: Kelly Controller has no torque, jerks motor

Your experience clearly proofes that it was the wrong phase/hall combination as amberwolf told you. Now that you killed the controller you will not make the motor run again properly w/o repairing the controller first. Most probably two phase wires touched, or you touched one of the battery wires wit...
by izeman
Sep 30 2019 8:57am
Forum: Motor Technology
Topic: How to limit current of controller?
Replies: 14
Views: 361

Re: How to limit current of controller?

Putting a resistor into the phase wires would be a bad idea. ;) They power used would still be the same, and the BIIIIIIGGG resistor would just produce a lot of heat.
There are two correct ways:
.) program the controller and reduce the power output that way
.) upgrade wires to thicker ones
by izeman
Sep 23 2019 10:04am
Forum: E-Bike Technical
Topic: Loud clicking noise MAC 12T hub
Replies: 14
Views: 288

Re: Loud clicking noise MAC 12T hub

+1 on a broken bearing as well.
by izeman
Aug 30 2019 2:40am
Forum: E-Vehicles General Discussion
Topic: Problem with Nextdrive Scooter
Replies: 2
Views: 256

Re: Problem with Nextdrive Scooter

Thanks markz. Didn't read your post, but this is how I did it 8) Took out the battery (clever design, it's hidden in the steering tube, it's a 7s2p design all made very nicely. Then I wiggled it around while measuring the output voltage, which unsurprisingly changed from 27V to 23V, giving an indica...
by izeman
Aug 30 2019 2:23am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10kW stand-up scooter with air suspension
Replies: 197
Views: 17339

Re: 10kW stand-up scooter with air suspension

alex_2d wrote:
Aug 30 2019 1:30am
Madyicstik wrote:
Aug 27 2019 7:41am
How much did you sell it for if you dont mind me asking?
Approximately 29'700$
WTF ... Congratulations. Seems to be a market for it.
by izeman
Aug 30 2019 2:22am
Forum: General Discussion
Topic: How to identify antennas?
Replies: 25
Views: 897

Re: How to identify antennas?

If they are not having any markings it would be difficult and you should go for any test equipment to know the frequency of antennas. Thanks. Yes, they do have markings (double rings), but ALL of them have them. Seems they use the same plastic cover for all kinds of antennas. I now just test each o...
by izeman
Aug 26 2019 3:14am
Forum: E-Vehicles General Discussion
Topic: Problem with Nextdrive Scooter
Replies: 2
Views: 256

Problem with Nextdrive Scooter

A friend of mine bought one of these super cheap scooter: https://www.lightinthebox.com/en/p/self-balancing-scooter-for-adults-aluminium-shockproof_p6199595.html?prm=1.3.5.7 The issue he has: Once you "shake it" it just turns off. And you can't restart it. Once you connect the charger it can be star...
by izeman
Aug 20 2019 4:56am
Forum: General Discussion
Topic: How to identify antennas?
Replies: 25
Views: 897

Re: How to identify antennas?

If you have a set that works you could range test the various antennas. The one with the longest range will be the one for that frequency. I was pretty impressed with the range on my 433mHz remote switches. That was the only approach that makes sense in my case. And is the way i do it now. I was ho...
by izeman
Aug 19 2019 11:40am
Forum: General Discussion
Topic: How to identify antennas?
Replies: 25
Views: 897

Re: How to identify antennas?

433 was used for home automation sensors. I switched to zigbee mostly now - so i need 2.4ghz antennas to replace the pcb printed ones (for those cases where more range is needed).
by izeman
Aug 17 2019 8:59am
Forum: General Discussion
Topic: How to identify antennas?
Replies: 25
Views: 897

Re: How to identify antennas?

I have some 433 and 2.4 antennas and they look EXACTLY the same. So posting pics will make no sense. 🤮
by izeman
Aug 15 2019 3:13pm
Forum: General Discussion
Topic: How to identify antennas?
Replies: 25
Views: 897

Re: How to identify antennas?

kcuf wrote:
Aug 15 2019 11:28am
don't talk to devices
put em where they do the most good
Your help is really appreciated.
by izeman
Aug 15 2019 9:12am
Forum: General Discussion
Topic: How to identify antennas?
Replies: 25
Views: 897

Re: How to identify antennas?

kcuf wrote:
Aug 15 2019 8:34am
best antenna is elevation
Sure. Just tell this to my devices in the basement and I'm fine?? 8) :lol:
by izeman
Aug 15 2019 5:43am
Forum: General Discussion
Topic: How to identify antennas?
Replies: 25
Views: 897

Re: How to identify antennas?

Damn. I expected those answers, because it googled at bit before. I don't want (and in some cases even can't) disassemble the antennas. Of course it could just add them to the receiver and see which one works best, but that is a bit to much guess work for me. I hope the "one or two ring theory" is r...
by izeman
Aug 14 2019 12:01pm
Forum: General Discussion
Topic: How to identify antennas?
Replies: 25
Views: 897

How to identify antennas?

Over the years I bought several antennas from ebay, aliexpress ... Some for 433Mhz projects, some for Wifi (2.4/5.8Ghz). Some for 868Mhz. Of course after some time, if they where not installed, they ended all in one big box. They are all black or white, but other from that they look more or less the...
by izeman
Aug 04 2019 3:33am
Forum: E-Bike Technical
Topic: Automatic Wheelie control / Launch control module Beta testing
Replies: 16
Views: 1068

Re: Automatic Wheelie control / Launch control module Beta testing

Matt posted this on FB today: A friend was filming while we went out for a ride and tested the Wheelie Box/ Launch Control Module a little bit, along with some other toys! (the scooter was given to me, seems like a good project to amp up haha) iove had a few messages about them this week so as a sid...
by izeman
Jul 12 2019 3:11pm
Forum: Motor Technology
Topic: how to fan cool a controller?
Replies: 16
Views: 1397

Re: how to fan cool a controller?

spinningmagnets wrote:
Jul 12 2019 1:59pm
Ha ha! I didn't look at the date...
:bigthumb: 8) :lol:
by izeman
Jul 12 2019 11:46am
Forum: Motor Technology
Topic: how to fan cool a controller?
Replies: 16
Views: 1397

Re: how to fan cool a controller?

I would use two server-computer fans that are designed to run off of 48V (one pushing, one pulling). For a 72V system I would run three 24V fans in series. The centrifugal style will push more air than an axial, and look for a fan model that has ball bearings. Really? One of my first thread in 2013...
by izeman
Jul 09 2019 1:08pm
Forum: Battery Technology
Topic: Build a mini USV/UPS
Replies: 42
Views: 1467

Re: Build a mini USV/UPS

Here are the pics. I also did a 4A load test (~550mA per cell fuse). They didn't get warm at all. So at least they will survive normal operation. :)

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