Search found 159 matches

by obcd
Dec 19 2019 10:01am
Forum: Battery Technology
Topic: Capacitor spot welder
Replies: 3
Views: 571

Re: Capacitor spot welder

For good spot welding, you need "controlled current", "controlled welding time" and "controlled pressure". It's also best if you have a foot pedal so you can engage the welding after you placed the electrodes on the correct spot and brought them under the correct pressu...
by obcd
Dec 19 2019 5:32am
Forum: Motor Technology
Topic: TSDZ2 mid drive with 860C, 850C or SW102 displays only -- Flexible OpenSource firmware (Casainho code only)
Replies: 6506
Views: 481853

Re: TSDZ2 mid drive -- Flexible OpenSource firmware for TongSheng TSDZ2 mid drive motor

It used to be a feature in the motor firmware for debugging. When one of the E-brakes is activated during powerup of the motor firmware, it will not power the motor. You can single step trough the motor firmware for debugging with that. I assume the display controls it's own backlight and also sends...
by obcd
Dec 18 2019 8:20am
Forum: EBike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 8328
Views: 909302

Re: New "TSDZ2 Torque Sensor Central Motor"

Maybe you can set the motor to cadence only. In that mode, it ignores the torque sensor and can be tested with the real wheel lifted if you rotate the pedals. Another option is walk assist to get it running without torque and cadence.
by obcd
Dec 17 2019 4:40pm
Forum: Battery Technology
Topic: Lithium battery question
Replies: 85
Views: 6691

Re: Lithium battery question

You could take 2 12V 35W halogene spots and connect them in serie. If you connect them to the battery, it should form a good cheap load to see if the battery is in healthy condition. 35W should give a load of 3 Amps. 50W halogene spots would form a load of 4.2 Amps. With that amount of current, an u...
by obcd
Dec 17 2019 4:28pm
Forum: Battery Technology
Topic: 2S Lithium Protection Board needs activation before working
Replies: 4
Views: 568

Re: 2S Lithium Protection Board needs activation before working

If the battery voltages comes below the minimum threshold, the BMS will disconnect the output. It assumes you will charge the batteries using those terminals as well. So, once it's activated, it should stay like that. The BMS board is seen as a part that stays with the batteries, so it's likely norm...
by obcd
Dec 16 2019 6:42am
Forum: Battery Technology
Topic: Sanyo 18650GA fakes?
Replies: 11
Views: 1071

Re: Sanyo 18650GA fakes?

You could run a charge / discharge test on one cell to see what capacity it has. A small 6V light bulb can be used as load for the cell. Simply connect it to the charged cell and monitor the voltage over time. See how long it takes to bring the cell to 3V (considered a safe low voltage treshold) Thi...
by obcd
Dec 16 2019 6:36am
Forum: Battery Technology
Topic: Lithium battery question
Replies: 85
Views: 6691

Re: Lithium battery question

Good lithium batteries have a BMS board that limits the maximum current the battery can deliver. A standstill motor has a huge inrush current at startup and that might trigger the BMS to disconnect the battery. The controller will drive the motor with a PWM signal. It rapidly turns the power on and ...
by obcd
Dec 15 2019 2:21pm
Forum: Battery Technology
Topic: 13$ battery spot welder testing out
Replies: 17
Views: 3227

Re: 13$ battery spot welder testing out

For a good spot weld, you need controlled current, welding time and pressure.

If all 3 are furfilled, it's a great find.
by obcd
Dec 15 2019 12:56pm
Forum: Motor Technology
Topic: Can you add regenerative power to any EV ? YES u can
Replies: 6
Views: 782

Re: Can you add regenerative power to any EV ? YES u can

Isn't the idea that the battery and the motor helps you pedalling easier.
Pedalling to charge the battery will be the opposite of that. Downhill, agreed...
by obcd
Dec 15 2019 5:32am
Forum: Motor Technology
Topic: Can you add regenerative power to any EV ? YES u can
Replies: 6
Views: 782

Re: Can you add regenerative power to any EV ? YES u can

The amount of energy you can generate using regen largely depends upon the mass of the moving vehicule. Next, you need to consider that more and more E-bike motors use some kind of gearing to let the motor run at a high efficiency RPM. Due to that, they also provide freewheeling so the motor doesn't...
by obcd
Dec 12 2019 6:01pm
Forum: EBike Technical
Topic: Identify this secret controller
Replies: 7
Views: 1040

Re: Identify this secret controller

The way most displays work: They get the battery voltage from the controller and pass it trough on another wire to inform the controller to turn on. Some displays receive 12V from the controllers, others 5V. Normally the wire that turns the controller on isn't suposed to deliver high current. 3W on ...
by obcd
Dec 12 2019 5:49pm
Forum: EBike General Discussion
Topic: ebike build- responsability
Replies: 24
Views: 2288

Re: ebike build- responsability

The way I see it, building such a bike isn't illegal. Riding it on public roads is illegal. So, it's the person riding it that is responsable for it's actions. To play safe, you could let him sign a paper that he is aware of the fact that the bike is not street legal. Some might be willing to say th...
by obcd
Dec 11 2019 11:25am
Forum: EBike Technical
Topic: battery issue?
Replies: 5
Views: 787

Re: battery issue?

The controller gets the full battery voltage. balancing is important to keep the cells groups into good condition. Is the error you get on the display the same you get when the battery voltage is low? If one cell group is having a high resistance, the voltage will seriously drop under load. It can e...
by obcd
Dec 11 2019 8:09am
Forum: E-Vehicles General Discussion
Topic: Question for engineers and EV geeks: What are the advantages for a car being designed as a BEV only?
Replies: 19
Views: 2726

Re: Question for engineers and EV geeks: What are the advantages for a car being designed as a BEV only?

They are easier to construct, should be lighter and cheaper. In a hybrid, you have the electro motor and the other one. In an all EV you just have one or more electro motors. A full EV will need a bigger battery and might need some planning for longer trips as the car will need to be charged. In our...
by obcd
Dec 11 2019 6:10am
Forum: EBike Technical
Topic: What lock do you use?
Replies: 8
Views: 739

Re: What lock do you use?

If they use an angular grinder to open your lock, not much you can do about it. Assuming they don't all run around "with such" in their pocket, a fixed bar D-lock seems to be most resistant. Also don't go for a quick adjust saddle height as it makes it very easy to steel your saddle withou...
by obcd
Dec 11 2019 5:52am
Forum: EBike Technical
Topic: Serious charger problem? Or even battery related...?
Replies: 9
Views: 892

Re: Serious charger problem? Or even battery related...?

My first guess would also be a bad fan. A simple test is running it for a very short time with the fan disconnected. If it remains silent like that, you know for sure it's the fan. It shouldn't overheat if you only run it like that for half a minute unless it's a really really bad design.
by obcd
Dec 11 2019 4:26am
Forum: Motor Technology
Topic: TSDZ2 mid drive with 860C, 850C or SW102 displays only -- Flexible OpenSource firmware (Casainho code only)
Replies: 6506
Views: 481853

Re: TSDZ2 mid drive -- Flexible OpenSource firmware for TongSheng TSDZ2 mid drive motor

Without studying and knowing the code, I would expect it to do some filtering and averaging of the battery voltage. Let's assume you read the voltage every second. If you take the average of 2 readings, you only have the result 2 seconds later. Without averaging, you will have the result after a sec...
by obcd
Dec 11 2019 4:13am
Forum: Motor Technology
Topic: Non self starting 1-phase induction motor?
Replies: 2
Views: 585

Re: Non self starting 1-phase induction motor?

They sure did exist like 40 yars ago. I remember we had a pump. It had a handle with half a gear that could interact with another full gear on the motor / pump axe. You had to turn that handle till both gears connected. Next, you gave it a good swung and turned on the power. It either started or you...
by obcd
Dec 10 2019 6:22pm
Forum: EBike Technical
Topic: Identify this secret controller
Replies: 7
Views: 1040

Re: Identify this secret controller

Some controllers have a 6V output for the lights.
So, besides the relay you would need a step down converter to create that 6V from your battery voltage.
by obcd
Dec 10 2019 6:16pm
Forum: Battery Technology
Topic: 36 V pack not charging
Replies: 16
Views: 1350

Re: 36 V pack not charging

A bluetooth BMS will be able to tell you if the cell group is still providing current like the other groups. If the voltage of that group drops faster during use compared to the others, some cell damage has occurred. It can also give you some detailed information about your battery state of charge. ...
by obcd
Dec 09 2019 10:19am
Forum: EBike Technical
Topic: Help Brushless Controller Replacement
Replies: 5
Views: 544

Re: Help Brushless Controller Replacement

If the controller is easy to open, some pictures of the inside of it could be usefull. You also might post some pictures of the different connection plugs and maybe point out what they connect 2. There is nothing universal about the colors used for the wires. Black is usually gnd and red "some&...
by obcd
Dec 08 2019 1:58pm
Forum: Battery Technology
Topic: Can heating up battery give longer distance?
Replies: 24
Views: 2530

Re: Can heating up battery give longer distance?

I doubt you can compare tesla batteries with e-bike batteries. While e-bike batteries have a prognosed battery life of 600 - 1000 full charge cycles, Electric vehicules batteries should sustain 4000+ full charge cycles. Replacing your car battery after 3-5 years of use would be very costly. Tesla (a...
by obcd
Dec 08 2019 11:35am
Forum: Battery Technology
Topic: 36 V pack not charging
Replies: 16
Views: 1350

Re: 36 V pack not charging

Balancing ensures that all cell groups (for 36V you have 10 groups in serie A group could be 4 or 5 cells in parallel) remain equally charged Without a balancer, if one group has a lower voltage, it will stay like that as they all receive the same amount of energy. The group with the lower voltage s...
by obcd
Dec 08 2019 8:50am
Forum: Battery Technology
Topic: 36 V pack not charging
Replies: 16
Views: 1350

Re: 36 V pack not charging

So the advice is to connect a 5V charger to a group of cells that got discharged to 0.6V ? First of all I would recommend to "at least" place some resistor in serie to limit possible charge current. Like 5V - 0.6V / 0.1A = 44 ohms. A 56 ohms should work as well. It will choke maximum 4.4V ...
by obcd
Dec 06 2019 7:38am
Forum: EBike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 8328
Views: 909302

Re: New "TSDZ2 Torque Sensor Central Motor"

Is the protocol between the blevo program and the brose controller somewhere documented? I would also prefer an open source solution as it has no limitations. If there is something you don't like you can tweak (program) it yourself. So in the beginning, yes, you will reinvent the wheel, but once the...