• Howdy! we're looking for donations to finish custom knowledgebase software for this forum. Please see our Funding drive thread

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

Ok , I will check.
Here must be TTL levels ?
Here must be same PWM at standstill, like on High side ?
 
I measured resistance on pins 20-23 and GND - 3.3K . Then i cut the line to pin 20 . To cpu side ~7M , to resistors 3.3K
Tryed to get diagram on cutted pin20 :

Diag3.jpg

Strange signal ..

Can it be something wrong with CPU or pin output not initialized properly ? How to find it out ?

As on schematic PIN 19 (PB3) is unused . Can it be assigned for testing ?

Br , Linas
 
Hello im new here can someone pls tell me how this works? will st link v2 work? how to connect st link? i have kt48zwsrl-xfc15 48v 35a controller.

controller board https://gyazo.com/71cf0bea71c695e0a4e06cb639ab2413
cortroller wires https://gyazo.com/742dd81028d49db1a7868afa50ef169a
 
Look here :
https://github.com/stancecoke/BMSBattery_S_controllers_firmware/wiki/01-Hardware-needed

CPU is STM8S105 ?
 
shellton said:
I measured resistance on pins 20-23 and GND - 3.3K . ...
Can it be something wrong with CPU or pin output not initialized properly ? How to find it out ?
Click to expand...
Hm, seems that the mikrocontroller is defective. 3.3K is OK.

you can disable the PWM output and toggle the pin manually in slow loop to check it.

TIM1_CtrlPWMOutputs(DISABLE);
GPIO_WriteReverse(GPIOx, GPIO_PIN_y);

regards
stancecoke
 
I studied source to find out , where i can insert this . Its a complicated to me , i dont know this cpu ..
Stancecoke, please help me with this.

Br, Linas
 
Hi , sorry for late answer.
At last i figured out this case. I think it was my faulty. It was something wrong with firmware compiling. I downloaded source one more time and compiled it. And miracle happened , PWM appeared at both : Low and High side . I attached the motor, some angle adjustment and motor started spin perfectly. :)

What about reverse ? Is it possible to implement ? On pad X4 may be ?

BR , Linas
 
so I spent all night messing with this KT 18-fet 72v controller only to be defeated. To start I just finished putting my bike back together after sitting in pieces for years. upgraded the original 48/1000 hub motor with larger wires, skf bearings and some statoraid. I did test the halls prior to final assembly "5v-0v" on each one with a magnet. With original KT firmware i kept gettings 03_info error no matter what combination of phase or hall sensor. so I tossed on a sunwin controller and it runs perfect with that controller.. even has speed boost on "high" speed selection which needs hall sensors even though it will run sensorless but no boost.. I verfied this by running with and without hall connections. I decidied to go for broke and see if the opensource firmware may make a difference.. after finally getting the software needed for it I was able to compile and flash as well as get bluosec functioning correctly. But still no spin.. the motor will twitch then lock in place until power is disconnected. I pulled up the phase monitor in bluosec and it just goes between a full circle of 3 and 4. I do not understand how the halls are bad when they test good with a meter.. what am I missing?
 
shellton said:
What about reverse ? Is it possible to implement ? On pad X4 may be ?
Click to expand...

Yes, of course. You just have to swap two pwm channels and change the angle interpolation. You have to check two following hall events to detect the direction and adapt the angle corresponding. I did it in the Lishui project just two weeks ago 😀

regards
stancecoke
 
Black6spdZ said:
I do not understand how the halls are bad when they test good with a meter.. what am I missing?
Click to expand...
The Halls are not in 120° position
If you get only 3 and 4 all three halls are switching at the same time :shock:
3 - - > 011
4 - - > 100

using-bldc-hall-sensors-as-position-encoders-pt1-img4.jpg


regards
stancecoke
 
stancecoke said:
Black6spdZ said:
I do not understand how the halls are bad when they test good with a meter.. what am I missing?
Click to expand...
The Halls are not in 120° position
If you get only 3 and 4 all three halls are switching at the same time :shock:
3 - - > 011
4 - - > 100

using-bldc-hall-sensors-as-position-encoders-pt1-img4.jpg


regards
stancecoke
Click to expand...

thanks for the reply back. my motor is an old 9C 2706, 46 magnets, 51 poles.. are you saying it is still a potential hardware issue or just software configuration? I'd really like to get this newer controller with sine and regen over the caveman sunwin

quick update.. so when I connect the halls with a 10k pull-up to my two channel scope I get the normal pattern, the same as I see connected to the sunwin, but when I connect the scope to the KT I get the halls turning on for a shorter interval with never any overlap.. wth?
not sure why but continuity on KT hall input between + to sensor is ~46k and sensor to - is ~2.8k whereas the sunwin is 2.8M and 4k
there definately is some hardware issue or compatibilty problem with these halls and the KT..any resistor trickery I could do to make it work?
 
Look at schematic. Hall sensors must go to PINS 38-40 of CPU.

https://opensourceebikefirmware.bitbucket.io/development/EmbeddedFiles/32-BMSBattery_S06S-Kuteng_EBike_motor_controller_schematic.pdf

If pins are wrong , you can define them in gpio.h

BR , Linas
 
shellton said:
Look at schematic. Hall sensors must go to PINS 38-40 of CPU.

https://opensourceebikefirmware.bitbucket.io/development/EmbeddedFiles/32-BMSBattery_S06S-Kuteng_EBike_motor_controller_schematic.pdf

If pins are wrong , you can define them in gpio.h

BR , Linas
Click to expand...
Its the standard 18-fet PCB.. Maybe they used different value resistors on the supporting circuitry, or maybe a problem with the controller, or maybe the halls in my motor are flaky.. Just not sure how to narrow it down further. The fact that the halls test OK not connected to the KT and work with another controller lead me to believe the motor is OK. But i m not sure if I need another controller or replace the motor halls "which will be a major PITA" at this point
 
Trying to review code , to find max ERPMS ;

Code: 
#define PWM_CYCLES_COUNTER_MAX 3000 // higher values assume motor is at standstill.
#define PWM_CPS_NORMAL_SPEED 15625L
#define PWM_CPS_HIGH_SPEED 20833L

Do i understand correctly , that max eRPM is 15625/30 and 20833/30 ?
 
stancecoke said:
Black6spdZ said:
I pulled up the phase monitor in bluosec
Click to expand...
Do you have an external +5V power supply for the BT-module? The controller internal +5V supply is known to be very weak, it can't handle any additional load. You can try to supply the hallsensors with external +5V, too.

regards
stancecoke
Click to expand...

That's what I thought at first so I moved the hall power lead to the 5v pad next to the hall inputs that had a solid 5v but still the same results
 
ok.. unbelievable.. two of my halls were shorted in the controller connector that looked fine from the exterior. go figure! i had to swap phases wires around but got correct and smooth rotation.. finally! so i've been playing with settings and so far the lowest current freewheel is at 233deg motor angle correction with rotor correction angle on, or 250deg with it off. sine wavetable seems less efficient from a power standpoint with just a slight improvement in audible motor noise. I changed out the rail caps with rubicon 1000uf, 100v instead of the cheap 470uf ones along with a flash pigtail and 10ga power wires. just waiting on some new XT90 connectors to finish up.
on a side note, there is a problem with bluosec app, it's voltage cal only allows up to 100 whereas my 72v controller needs it set to 136. i clicked on it in the app and it changed it to less than 100 again so it looks like i'll have to erase and reflash again to get that right
 
Are there any plans to implement field weakening in this firmware? I could really use it ;)
 
Vbruun said:
Are there any plans to implement field weakening in this firmware?
Click to expand...
I will not implement that, but of course everybody is invited to do it :wink: .
It's very easy, you just have to increase the ui8_assumed_motor_position with the speed. You have to do the angle correction procedure later (or earlier, I don't know exacty, just try it... :eek: ) within the electric revolution. Tune the ui8_correction_at_angle with the speed, see line 271 of the motor.c

Code: 
if ((ui8_foc_enable_flag) && ((ui8_assumed_motor_position) >= (ui8_correction_at_angle + (ui16_motor_speed_erps>>factor))) &&(ui8_assumed_motor_position) < (ui8_correction_at_angle + (ui16_motor_speed_erps>>factor) + 4))) {
		// make sure we just execute one time per ERPS, so reset the flag
		ui8_foc_enable_flag = 0;

		updateCorrection();
	}

Of course it would be better to activate the additional angle only at very high erps, to keep the best efficieny at lower erps.

regards
stancecoke
 
You must log in or register to reply here.

Similar threads

E-HP
    • Like
DIY Newb FAQ?
Replies
20
Views
2,936
neptronix
neptronix
casainho
Bafang BBSHD BBS02 mid drive -- Flexible OpenSource firmware
2 3 4 5 6
Replies
129
Views
38,165
stts
S
casainho
Unlock the max power of your scooter: Flexible OpenSource firmware for Kunteng KT motor controllers (0.25kW up to 5kW)
Replies
2
Views
2,900
ElectricGod
ElectricGod
casainho
TSDZ2 mid drive with 860C, 850C or SW102 displays only -- Flexible OpenSource firmware (Casainho code only)
265 266 267 268 269
Replies
6,705
Views
712,404
Aquakitty
Aquakitty
casainho
KT LCD3 firmware -- Flexible OpenSource firmware for Kunteng KT-LCD3
2 3 4 5
Replies
108
Views
30,527
puh
puh
Back
Top