Endless Sphere

You can try it of course, but I don't recomment to do it. The big resistor and the voltage regulator will get very hot. Perhaps the voltage will drop and you'll get a very strange behaviour of the whole system.

regards
stancecoke

@Xnyle has implemented the experimental function PWM off in the Java-tool. You can try this setting. But rotating the wheel by hand is not a normal use case, while riding or pushing your bike you won't recognize a resistance, as the control loop will keep the current at zero fast enough. regards sta...

So i assume it can work also in this open source firmware ? @Xnyle has implemented all parameters of the protocol in the display.c code, but as both of us don't like LCD displays very much, only very basic functions, like assist level, are really used. Just for showing speed, power and switching th...

if it can support the Bafang SW102 display device You can use a eggrider display , it uses the same hardware and is available with Kunteng protocol, as far as I know. Where are the most up to date and simple step by step instructions for getting set up? See my signature. regards stancecoke

No, this is not a "mechanical" problem, it is absolutely exactly a software problem. Or, perhaps, hardware problems (signal filtering, interference) of the KT controllers themselves. OK, but it can't be a software problem. I have a buck converter for supplying the head- and rearlights on my bike. E...

haiyi911 wrote: ↑

May 15 2019 8:17am

i tried other controller and the motor run well

Was the other controller a square wave or a sinosodial one?

regards
stancecoke

i think i am limited with KV value of moto Yes, you have to use a battery with higher voltage or you have to use field weakening (not recommented) with my direct motor the small resonance vibrations in the range of 11-12km/h,could it be fixed? It's a mecanical problem, you can try to increase/decre...

Really cool design !
Is there any progress in the vibration issue?

regards
stancecoke

Yes, the Sempu T4 is the better choice. My experience with the Bafang sensor (eunorau) is very bad, see the german forum:

https://www.pedelecforum.de/forum/index ... sor.56636/

regards
stancecoke

gutyex wrote: ↑

Apr 01 2019 12:53pm

I'll dig out the necessary hardware and see if I can get the diagnostic output from the controller.

I try to add all issues, that are reported more than one time, to the FAQs at github.
You can add your findings there, too. Everybody with a github-account can edit the Wiki.

regards
stancecoke

casainho wrote: ↑

Mar 26 2019 9:48am

Don't you guys want to help develop the firmware for SW102 Bluetooth graphic LCD

I still admire your ambition when it comes to displays. I just find it boring, I don't want to have any frills on the handlebars.
Perhaps, Xnyle is interested...

regards
stancecoke

kotofos wrote: ↑

Mar 22 2019 4:11am

Hi, will it have losses about same as in stock fw, or more than stock?

I don't know. Just try it.

regards
stancecoke

The implementation would be not that difficult. You have to determine the "base line" of the Motor at different voltages with a suitable test stand by braking the motor from idle run to the defined maximum current. From this you get the linear equations for OmegaA1 and OmegaA2 depending on the volta...

I would prefer to start looking at technical notes about the subject, because maybe we can find a simple algorithm to do that. This paper shows a quite pragmatic way to implement field weakening with simple math, but you need to know the motor characteristic ("base speed line" and back EMF constant...

I know there is an enhancement request in github for this. If the devs have some idea how to enhance this, I will help with beta testing. you could increase the advance angle at high speeds for field weakening by using an exponential function. But I don't know, if the calculation can be done in rea...

Bash1303 wrote: ↑

Mar 16 2019 6:44am

Does the controller give the same power for the road and offroad mode?

Yes, the offroad mode disables the speed limit only. The power depends on your battery-current settings. The 250W limit is only relevant for the long-term capacity of the motor.

regards
stancecoke

This is not wrong, it is an approximation, and it is as accurate as the one currently used. No. The way it is implemented at the moment, it's based on a proper physical correlation, with the known issue of ignored losses. With your suggestion, it's just not correct, especially at low duty cycles an...

casainho wrote: ↑

Mar 18 2019 5:28am

on TSDZ2 is even different the FOC implementation.

Ah, I remember, you calculate the advance angle from battery current and erps

regards
stancecoke

I think the torque of the motor is proportional to the battery current. No, this is definitivly wrong. The torque is proportional to the quadrature part "iq" of the motor current, (motor current = battery current / dutycycle). The direct part "id" produces no torque but only heat and is controlled ...

marcoq version had a sort of major update that includes also the VLCD5 compatibility and the backwards resistance sorted. He released it only on the Italian forum by now, for the first tests. He followed the suggestion to disable the PWM :D #if ENABLE_BACKWARDS_RESISTANCE_OFF // stop pwm motor: if(...

The problem is that you divide torque by voltage to calculate the setpoint current. The consequence is that the current setpoint will be underestimated. ...I am very sorry for not sharing my point of view effectively. Indeed. :wink: The behaviour we want to have is Pmotor = Assistfactor * Phuman We...

NIPSEN wrote: ↑

Mar 16 2019 12:38pm

We simply find that the engine speed is proportional to the voltage applied, i.e. the constant Kv.

Again, this is only correct for idle running. The higher the load, the lower the speed at constant voltage...

regards
stancecoke

The actual solution: Pedal Torque * Pedal Speed = Power Power / Voltage = Current With my proposal: Pedal torque * Constants = Current You can write also: Pedal Torque * Pedal Speed = Power Power= Voltage * Current from this follows Pedal Torque * Pedal Speed = Voltage * Current With your suggestio...

We don't need to know the motor torque, as we just want to control the power. If we ignore losses it's just P = U * I. Of course you could take the detour via the mechanical power P = motor-torque * motor-speed, but why should we do that??? For the short moment of applied torque at standstill, the k...

I cannot seem to find anything from the java tool Just uncheck the checkbox "enable rotor angle correction" This will disable FOC. https://camo.githubusercontent.com/6f67eb5fc7549e8fde9c09e58ce1629f53801984/68747470733a2f2f7777772e706564656c6563666f72756d2e64652f77696b692f6c69622f6578652f6665746368...