Endless Sphere

I have the unlocked version. I can set the battery amps to 250 and the phase amps to 550. Maybe even higher. Limit for flux weakening is 80A in the Bluetooth app, but through PC application it accepts 200A. I did not try to ride at more than 80A of flux weakening so far. Do you think there is a risk...

I am running a SVMC072150 together with a 22S Lipo battery. I use a second throttle for regen braking. Unfortunately it only starts working when the battery is already down to around 40% (83V). The Sabvoton shows over 2V higher battery voltage in its software than real battery voltage. It seems than...

Thanks a lot for that attachment scheme! I would also prefer single piece TAs, but I did not find anything for a 16mm axle. An idea would be to install 2 TAs in a way like you outlined instead of the 2 spacers additionally to the 2 TAs which are already mounted. It would not be 100% symmetrical (wha...

I would really be suprised if a 3T winding would already saturate at 250 amps. I remeber I read something around 450 amps for saturation here on ES, but don't remeber in which topic. The difference when going from 225 to 350 phase amps was clearly noticable in torque. But of course I am not using th...

I plan to run regen braking later (after 5 times charging the lipos). I am using a second throttle for E-brake and have set it to 20A at the moment which has not much effect of course. Battery is 22S 16000mAh 20/40C. Max charge is 5C (80A), which I plan to set the E-brake to later. Controller is a S...

It is the fastest winding (3T) in a 17'' MC wheel. Resistance measured from one motor phase to another is only 67mOhm (including the phase wires). So I think 350 phase amps should be okay and motor did not get hot at all on my tests so far. Not sure if 450 amps would be okay, but it is already impos...

I went down to 70Nm now because I don't want to risk to strip the thread. Even though it is a 16mm axle I am not sure if 100Nm will be okay.

At the moment I am using these torque arms on both sides: https://img3.picload.org/image/dlcaaoow/dsc_0295.jpg I have tightened the nuts with 100Nm of torque and will retighten them after every ride in the first days. Do you think I can tighten with more than 100Nm or will it probably cause damage t...

What amount of tightening torque would you recommend for the axle nuts on an MXUS 3k v3?

Thanks a lot for your advice!

What about replacing the axle? I could get a new Mxus 3k v3 axle for $30.
Is it a lot of effort to replace the axle and are special tools required?

Unfortunately I cannot even put it on the axle any more probably because the nut damaged the thread when I removed the nut after that incident.

I tried the second set of Hall sensors and this seems to be fine. At least the wheel is spinning when I turn the throttle. The insulation where the cable is coming out of the axle is clearly damaged. However I have another problem now. The thread was damaged and I cannot put the nut back on now (wit...

Unfortunately today the axle of my MXUS v3 3T spun inside the dropout. So I guess torque arms are a must at this amount of torque even for an overbuilt steel frame. After that happened, the motor stopped working and told me "Hall error". What do you think most probably happened? A hall sen...

If max. phase amps would be 350A and max field weakening would be 50A, would the max amps going through the phase wires be 400A or still 350A?

If flux weakening if activated, is it also active and drawing power at lower speeds?

I think the maximum value I can set in the Sabvoton software would be 150A.
For the Lipos this would not be a problem.

Isn't there a risk to destabilize the motor's magnets with this amount of flux weakening?

How many amps of flux/field weakening would you consider safe without risking to destabilize the magnets?
Motor is a MXUS 3k v3 3T

Sorry for the confusion. When I first tested to turn the motor diconnected, it was hard to turn. I guess I made a mistake during that and 2 phase cables were touching. When I tried it later, it was not hard to turn any more. After some measurements it came out that the resistance from one phase cabl...

I mentioned earlier that the motor is also hard to turn when disconnected. This is not the case. Probably there were two phase cables touching.
It turned out that it was the yellow phase wire which is shorted to 0V via the controller.
Looks like a blown FET.

Resitance phase wire via controller: Green to yellow phase wire: 10kohm Blue to yellow phase wire: 10kohm Blue to green phase wire: 20kohm Is that normal? Resistance phase wire via motor: All combinations <1Ohm Motor is hard to turn also with everything disconnected and power off. According to the m...

Today I was pushing my 2000W bike too hard at the hot weather. It has a 40A KT controller with the LCD3 display and I think the motor is this one: https://bmsbattery.com/ebike-kit/471-q11-48v1kw-rear-driving-disc-brake-hub-motor-ebike-kit.html Power was suddenly gone and the motor became very hard t...

I am not going to replace the controller, but I am interested if there are more advanced controllers available. This will probably not be the last ebike that I am building. Before getting the Sabvoton, I was thinking about the Adaptto MAX-E, but at the moment they are not available and many people s...

Thanks a lot for the reply!

So the Sabvoton probably uses a simpler technique.
Are there any controllers that use a more sophisticated technique? (Adaptto?)
Which of them use space vector modulation?

It is fine with a resistance around 450 Ohm in series. One sensor reads around 545 and the other around 575 Ohms at about 25 degrees Celsius. I now switched to the second set of halls and temp sensor of the MXUS. This one shows more stable values when the motor is turning. It is always around 3-4 de...

Unfortunately that is not fast enough ;-) By the way, it is a 17'' mc rim. There is no Cycle Analyst connected. The seller told me that it is normal that the no load rpms are lower with sinewave controllers (flux weak disabled) than with squarewave controllers, but I thought no-load rpm would be the...

Could it be that I cannot get as much rpm (no-load) with a sinewave contoller (flux weak. disabled) than I could get with a square wave?

I use a MXUS 3k v3 3T with a Sabvoton SVMC72150 and cannot get more than 588rpm @ 54V.
Kv of the 3T is 11.9, so rpm should be around 640.