Search found 229 matches

by hias9
Sep 01 2018 10:01pm
Forum: EBike Reviews & Testing
Topic: Sabvoton SVMC072150 controller review, variable regen *PICS*
Replies: 375
Views: 86932

Re: Sabvoton SVMC072150 controller review, variable regen *PICS*

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...
by hias9
Aug 31 2018 10:48pm
Forum: EBike Reviews & Testing
Topic: Sabvoton SVMC072150 controller review, variable regen *PICS*
Replies: 375
Views: 86932

Re: Sabvoton SVMC072150 controller review, variable regen *PICS*

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...
by hias9
Aug 25 2018 9:13pm
Forum: EBike Technical
Topic: Tightening Torque MXUS 3k v3
Replies: 20
Views: 1423

Re: Tightening Torque MXUS 3k v3

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...
by hias9
Aug 25 2018 4:40pm
Forum: EBike Technical
Topic: Tightening Torque MXUS 3k v3
Replies: 20
Views: 1423

Re: Tightening Torque MXUS 3k v3

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...
by hias9
Aug 25 2018 2:59pm
Forum: EBike Technical
Topic: Tightening Torque MXUS 3k v3
Replies: 20
Views: 1423

Re: Tightening Torque MXUS 3k v3

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...
by hias9
Aug 25 2018 1:15pm
Forum: EBike Technical
Topic: Tightening Torque MXUS 3k v3
Replies: 20
Views: 1423

Re: Tightening Torque MXUS 3k v3

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...
by hias9
Aug 24 2018 7:56pm
Forum: EBike Technical
Topic: Tightening Torque MXUS 3k v3
Replies: 20
Views: 1423

Re: Tightening Torque MXUS 3k v3

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.
by hias9
Aug 24 2018 7:02pm
Forum: EBike Technical
Topic: Tightening Torque MXUS 3k v3
Replies: 20
Views: 1423

Re: Tightening Torque MXUS 3k v3

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...
by hias9
Aug 24 2018 11:08am
Forum: EBike Technical
Topic: Tightening Torque MXUS 3k v3
Replies: 20
Views: 1423

Tightening Torque MXUS 3k v3

What amount of tightening torque would you recommend for the axle nuts on an MXUS 3k v3?
by hias9
Aug 19 2018 9:59am
Forum: EBike Technical
Topic: Axle spun inside dropout, Hall cable broken?
Replies: 10
Views: 875

Re: Axle spun inside dropout, Hall cable broken?

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?
by hias9
Aug 19 2018 2:20am
Forum: EBike Technical
Topic: Axle spun inside dropout, Hall cable broken?
Replies: 10
Views: 875

Re: Axle spun inside dropout, Hall cable broken?

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.
by hias9
Aug 19 2018 1:05am
Forum: EBike Technical
Topic: Axle spun inside dropout, Hall cable broken?
Replies: 10
Views: 875

Re: Axle spun inside dropout, Hall cable broken?

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...
by hias9
Aug 18 2018 5:10pm
Forum: EBike Technical
Topic: Axle spun inside dropout, Hall cable broken?
Replies: 10
Views: 875

Axle spun inside dropout, Hall cable broken?

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...
by hias9
Aug 13 2018 8:21pm
Forum: EBike Technical
Topic: Max safe Flux Weakening
Replies: 7
Views: 1247

Re: Max safe Flux Weakening

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?
by hias9
Aug 12 2018 9:37pm
Forum: EBike Technical
Topic: Max safe Flux Weakening
Replies: 7
Views: 1247

Re: Max safe Flux Weakening

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?
by hias9
Aug 12 2018 9:27pm
Forum: EBike Technical
Topic: Max safe Flux Weakening
Replies: 7
Views: 1247

Max safe 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
by hias9
Aug 03 2018 6:07pm
Forum: EBike General Discussion
Topic: Motor or Controller broken?
Replies: 10
Views: 736

Re: Motor or Controller broken?

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...
by hias9
Aug 03 2018 3:04am
Forum: EBike General Discussion
Topic: Motor or Controller broken?
Replies: 10
Views: 736

Re: Motor or Controller broken?

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.
by hias9
Aug 02 2018 10:39pm
Forum: EBike General Discussion
Topic: Motor or Controller broken?
Replies: 10
Views: 736

Re: Motor or Controller broken?

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...
by hias9
Aug 02 2018 8:48pm
Forum: EBike General Discussion
Topic: Motor or Controller broken?
Replies: 10
Views: 736

Motor or Controller broken?

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...
by hias9
Jul 31 2018 9:54pm
Forum: EBike Technical
Topic: Lower no-load speed with sine wave controller?
Replies: 11
Views: 810

Re: Lower no-load speed with sine wave controller?

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...
by hias9
Jul 30 2018 11:06pm
Forum: EBike Technical
Topic: Lower no-load speed with sine wave controller?
Replies: 11
Views: 810

Re: Lower no-load speed with sine wave controller?

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?
by hias9
Jul 30 2018 9:09pm
Forum: EBike General Discussion
Topic: Problem w/ Temp Sensor MXUS 3k Sabvoton
Replies: 7
Views: 1118

Re: Problem w/ Temp Sensor MXUS 3k Sabvoton

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...
by hias9
Jul 30 2018 8:14pm
Forum: EBike Technical
Topic: Lower no-load speed with sine wave controller?
Replies: 11
Views: 810

Re: Lower no-load speed with sine wave controller?

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...
by hias9
Jul 30 2018 3:36am
Forum: EBike Technical
Topic: Lower no-load speed with sine wave controller?
Replies: 11
Views: 810

Lower no-load speed with sine wave controller?

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.