Search found 185 matches

by honya96
Feb 21, 2018 8:26 pm
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

My smaller "big" bike can take 50A battery regen current if overvoltage limited... just saying VESC config looks good, would love to have same with kunteng :) and I hope the way you are implementing will do the job for this summer. At slow loop 10Hz, using PI controller, only motor phase current is...
by honya96
Feb 21, 2018 7:53 pm
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

Motor regen current depends more on hardware so it probably is the same value as motor current. Battery and battery regen currents are different, because batteries charge at lower rates. Here is a VESC configuration tool My smaller "big" bike can take 50A battery regen current if overvoltage limite...
by honya96
Feb 21, 2018 7:29 pm
Forum: E-Bike Technical
Topic: Adaptto Mini-E/Max-E Owner's Thread
Replies: 4781
Views: 364112

Re: Adaptto Mini-E/Max-E Owner's Thread

Anyone can say what value is R32?
by honya96
Feb 21, 2018 7:01 pm
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

So I want to implement limit max motor and battery currents. Do you guys know if I should do also limit battery and motor max currents? -- because before I were just limiting battery current for regen... After last lizardmech's post I wonder how does the ouput of the shunt look like, will get an os...
by honya96
Feb 20, 2018 5:25 pm
Forum: E-Bike General Discussion
Topic: Adaptto 12v, 5v power supply not working!!!
Replies: 1
Views: 37

Adaptto 12v, 5v power supply not working!!!

Hello, anyone can help with repair?

I have voltage at key switch wires, see no reason of failure.

Also accidentialy scraped off and lost R32, so I dont know value.
by honya96
Feb 20, 2018 11:01 am
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

So, current code should be good to protect powerful fast motors as Onya is being asking, I hope. So how is that "phase current limiting" implemented now? If its the simple calculation and there is a delay in dcA there will be delay in limiting..? Can we get rid of that low pass filter? Optional: st...
by honya96
Feb 20, 2018 8:26 am
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

stancecoke wrote:
Feb 20, 2018 8:25 am
To be honest, I don't understand that approach.
If it is as easy as battery current = duty_cycle * motor phase current there is no need to measure the phase current, we can just calculate it.

regards
stancecoke
But maybe its true, FOC controllers need it to run FOC, we dont.
by honya96
Feb 20, 2018 7:59 am
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

Almost certain it will be 15A motor phase limit Can bet anything that its DC limit, actually I know it for sure. @Casainho - look at your mosfet specs, thats the limit, but it will be a huge kick from standstill even at 15A DC, you dont need that. STP80NF70 is 98A, Try 30A phase first with throttle...
by honya96
Feb 20, 2018 7:55 am
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

The resistor hack works, however you need a power resistor with that can handle quite a bit of heat depending on how much current you want it to take. Accuracy is also degraded due to temperature impacting resistance. It will take almost no voltage drop so kind of any smd near zero Ohm should do th...
by honya96
Feb 20, 2018 7:49 am
Forum: E-Bike Technical
Topic: Adaptto Mini-E/Max-E Owner's Thread
Replies: 4781
Views: 364112

Re: Adaptto Mini-E/Max-E Owner's Thread

I've got to say that at present i am a little disappointed with my samsung 30Q cell performance,, in comparison that is with multistar lipo. It seems i did the math wrong, or in reality did not realise there would be such a big difference in perfrmance between the two chemistries. Ive gone with 10%...
by honya96
Feb 20, 2018 5:29 am
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

The resistor hack works, however you need a power resistor with that can handle quite a bit of heat depending on how much current you want it to take. Accuracy is also degraded due to temperature impacting resistance. It will take almost no voltage drop so kind of any smd near zero Ohm should do th...
by honya96
Feb 20, 2018 2:55 am
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

The mathematical model says that: battery current = duty_cycle * motor phase current. As the duty_cycle was 33%, so the motor phase current should be (battery current / 0.33) = 2.5/0.33 = 7.6 amps <--- the measured values seems to be inline with the mathematical model. Dont understand much of the p...
by honya96
Feb 20, 2018 2:48 am
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

lizardmech wrote:
Feb 20, 2018 2:04 am
Basically you have to configure any software based on the mV/A value but keep in mind the sensor is only accurate within its listed current rating.
@casainho - So if we you use the value from sensor, we need parallel resistor as you said.
by honya96
Feb 20, 2018 2:40 am
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

Just use open source hardware, PCB + assembly services are so cheap small production runs are easy these days. @casainho - if you decide to try this way, I can do like 2 testing units, to find if there is a need for any pcb improvment, and then batch of like 10pcs at component price for fw develope...
by honya96
Feb 19, 2018 8:08 pm
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

For doing FOC, we really need an STM32, no point to try do with STM8. Ideally, we would find a "cheap" motor controller that original firmware does FOC, like this ones: http://en.ertcz.com | https://ertcz.en.alibaba.com/ Just theoretical question. Is stm32 exactly pin compatible and really easy to ...
by honya96
Feb 19, 2018 4:43 am
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

So they use different versions because there is "phase over current" cut/protection on stock fw - I guess. I would say they use different versions so the sensor can hold the phase current. If you are looking to increase the phase current and battery current, I would put the power resistor in parall...
by honya96
Feb 18, 2018 7:10 pm
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

casainho wrote:
Feb 18, 2018 1:02 pm
We are looking for zero crossing of the wave of current, when it changes from a positive to negative value.

Ok, now I understand.

So they use different versions because there is "phase over current" cut/protection on stock fw - I guess.
by honya96
Feb 18, 2018 12:53 pm
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

See that on firmware, we use only the sensor output voltage (for "FOC") near 2.5V output (0 amps), so I would say would be no problem if the sensor is working on overcurrent. Dont understand yet exactly how it works.. but does that mean the model(50,100A..) does not matter really if we dont use it ...
by honya96
Feb 18, 2018 10:47 am
Forum: E-Bike Technical
Topic: Adaptto Mini-E/Max-E Owner's Thread
Replies: 4781
Views: 364112

Re: Adaptto Mini-E/Max-E Owner's Thread

What knd of resistance values are people getting displayed on the stats page? I was using multistar lipo and was getting and average of 30mohm. Now with 18650 samsung 30Q i get from 50 to 70 (brand new cells), does this sound ok? Sounds ok to me, depends on the configuration, but there is no need t...
by honya96
Feb 18, 2018 10:45 am
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

Is the version number of lcd5 on back side different? I have another question about phase current, when 6fet has 30A smd sensor, 12fet has 50A, 18fet 100A and there is also 150 and 200A version of that sensor. (You can find pdf easily) Does it mean it outputs "full" voltage from hall when at the rat...
by honya96
Feb 17, 2018 1:18 pm
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

I think, that can be only done by a mathematical model. Or hardware modification, which I will like the best, but is really hard. A) Adding 1 more hall current sensor to the last free AIN pin. (Sensor can be on wire, so not that hard do do for me) adding 2 more will be best but we dont have enough ...
by honya96
Feb 17, 2018 11:34 am
Forum: Motor Technology
Topic: Double MOSFET in your controler. Kuteng 12FET to 24FET
Replies: 26
Views: 931

Re: Double MOSFET in your controler. Kuteng 12FET to 24FET

How is it going? Got an idea about adding ceramic caps.. will share later.
by honya96
Feb 17, 2018 11:18 am
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

casainho wrote:
Feb 17, 2018 6:47 am
I think I got it. I hope to get back to this later.
Thank you, I really need this.

I know I am the only one (for now) trying higher powers but It will be important function for anyone who wants fast motor response from standstill without risking mosfets.. :wink:
by honya96
Feb 16, 2018 12:59 pm
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1757
Views: 47259

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

So you mean the S12S can't withstand his max current of 40A for a period of 2.5 seconds? Yes, actually not even 0.5 second with really fast motor, because 40A from battery can be 200A to motor. (=at mofets) Maybe you mean a current ramp, so the max controller current is not available at startup? No...