SkyRc Esc not working correctly

[holyhope]

Hi to all!

I have a SkyRc sensored ESC with brushless sensored 8.5T motor. Is this: https://geek.wish.com/search/sky rc esc motor sensored brushless#cid=575eb6fcaec374609c9b1513

I have a problem starting from the first turn on! 

In some position (exactly the same) the motor do not turn in front but can only turn reverse, in other one position is completly stop neither front or reverse.

I test the same motor with another ESC (Tamiya TBL02) and work right

I test another motor with the ESC skyrc and problem is still present

I test same kit (motor and esc skyrc) without sensor cable and works right

i test with another sensor cable and still not work

So I suppose it is defecting the ESC.

I disassembly ESC and with multimeter I verify connection from all wire of sensor of the cable inside the circuite of ESC and all wire are good... 

So the problem could be inside circuite of ESC or maybe on configuration. I try several modality of punch, timing, reverse, etc. but no one with success...

Someone have this combo ESC and motor? Someone can give me info about this problem? Can I try something to repair or adjust esc?

thanks 

Massimiliano

[Backlash]

Check that your motor to ESC connections are in the correct order, i.e A to A, B to B, and C to C... 

On a sensored brushless motor and ESC combo, these connections need to be correct, as there are the same/similar connections in the sensor cable...

[holyhope]

Hi Blacklash

First of all thaks for your answer.

I connect right color between motor and ESC... are in the same kit so i supposed color for A in motor is the same color of A in the ESC ... But maybe they made a mistake and connect wrong sensor.... but in this way the problem must apply only with this motor and not if I use the esc with another motor (problematic ESC with a good motor ----> problem present)

Maybe there is a problem inside circuite ESC but I verify on connect and it is good....

someone have internal electroinich schematic of circuite? so i can debug it...

Thanks

Massimiliano

[Backlash]

It would be really helpful if you could give us a link to the motor/ESC combo that you have that doesn't have a BIG popup wanting you to login before you can see what you have linked to...!!!!!

I remember seeing that someone had a similar issue to this recently, and the issue was that the colours on the ESC wires were wrong, and when you connected the ESC to the motor using the colours, it meant that you were not connecting A to A, B to B and C to C, so you may want to check the ESC to see if the outputs are labelled A, B and C, and then that they correspond to the A, B and C on the motor..

The fact that the motor wont work with the sensor cable connected, but works without the sensor cable connected suggests to me that there could be an issue with the motor to ESC connections.. 

[holyhope]

Hi backslash!
thanks for your answer! I 'm sorry for link... I forget that it is needed login before see products... I'm sorry!
Here there is a link on amazon: https://www.amazon.it/GoolRC-Brushless-Sensored-Sensorless-programma/dp/B01CNMJZNK I hope it could work for this purpose! It is the only SkyRc conmbo kit motor 8.5T 4MV (4000KV) and ESC brushless with fan and ALL orange
I not know how motor work exactly... I suppose that the brushed work with + and - commandend in PWM or voltage increase and decrease. The brushlesss i supposed works like home (industrial...) 380V tri-phase so each of A B or C has a sinusoidal function offset of 120^ from each other. In this way is difficult from me understanding how it works without sensor cable (without destroy the motor or giving it a lot of jerks).
this evening I will try to check if there is a wrong serigraph of letter A, B and C inside the ESC and try to connect in a right way... If all serigraph is right I try to revert phase random untill all will works right
many thanks
Massimiliano

[holyhope]

Hi 

I just try ALL possible combination and no one work better the original one... in other setting the motor or not work or turn very with a bad bad bad sound... the only way to work correctly is in the way as writed ...

but the problem is still present... There is a way to debug the sensor with a multimeter or it is possible only with an oscilloscope?

thanks

Massimiliano

[Backlash]

Logic suggests that of the 3 motor wires coming out of the ESC, the middle one "should" be the "B" phase... Likewise, the middle connection on the motor "should" also be the "B" phase.. Then it should just be a matter of identifying the other two phases...

Have you tried using another sensor cable off a different model that you know works OK.?

I have not had the opportunity or need to do any fault finding on a Brushless system, so it is hard to comment on what testing you can do.. You may be able to do some basic continuity testing on the sensor cable itself with a multimeter, but if you try to do it on the ESC, you could do some damage by introducing stray voltages where they are not meant to go.....

The pinouts for a sensor cable are as follows.. (You can see that pins 2, 3 & 4 correspond to the A, B & C phase going to the motor)
Pin #1 – black wire, ground potential (minus)
Pin #2 – orange wire, sensor phase C
Pin #3 – white wire, sensor phase B
Pin #4 – green wire, sensor phase A
Pin #5 – blue wire, motor temperature sensing, 10 k NTC
(other end of sensor is on ground potential, pin #1)
Pin #6 – red wire, sensors feeding, +5.0 V ± 10%.
(supply voltage for sensors provide controller, don´t connect external voltage !)

That information was found here... https://www.rcgroups.com/forums/showthread.php?1614786-Brushless-Sensored-Motor-Standard-Pinout

[Jonathon Gillham]

I have had a couple of issues with ESC's, not sure if they will help.

The first was the ESC needed calibrating to the Tx.  This was a Trackstar setup.  It was such a pain to do, took me ages but once I got it done it has worked fine ever since.  Prior to getting it done it behaved how I've been told a sensorless would behave, a lot of cogging at low speed, but also would do random things like take off when you weren't expecting it etc.  Funnily enough some of these symptoms are the same as a faulty sensor cable, so I tried that too but it was the calibration.

The other was without a sensor cable my Speed Passion ESC/motor combo would run but very slowly.  Yes, I forgot to plug in the sensor cable in my rush to try out the new toy.  I was so disappointed with Speed Passion, until I realised my mistake.  I was surprised that it ran at all.

So, the link says that its sensored/sensorless but I wonder if it really is?  Is it SkyRC or Gool RC since the link says its both?  I've never had either but I thought the Gool RC is sensorless, but the SkyRC is sensored.  If it works without the cable is it running at the speed you would expect?  It may be a sensored motor (since it runs on TBLE02S) with a sensored/sensorless capable ESC in sensorless mode?

[holyhope]

Hi to all! Thanks for your answer

5 hours ago, Backlash said:

Logic suggests that of the 3 motor wires coming out of the ESC, the middle one "should" be the "B" phase... Likewise, the middle connection on the motor "should" also be the "B" phase.. Then it should just be a matter of identifying the other two phases...

Have you tried using another sensor cable off a different model that you know works OK.?

I have not had the opportunity or need to do any fault finding on a Brushless system, so it is hard to comment on what testing you can do.. You may be able to do some basic continuity testing on the sensor cable itself with a multimeter, but if you try to do it on the ESC, you could do some damage by introducing stray voltages where they are not meant to go.....

The pinouts for a sensor cable are as follows.. (You can see that pins 2, 3 & 4 correspond to the A, B & C phase going to the motor)
Pin #1 – black wire, ground potential (minus)
Pin #2 – orange wire, sensor phase C
Pin #3 – white wire, sensor phase B
Pin #4 – green wire, sensor phase A
Pin #5 – blue wire, motor temperature sensing, 10 k NTC
(other end of sensor is on ground potential, pin #1)
Pin #6 – red wire, sensors feeding, +5.0 V ± 10%.
(supply voltage for sensors provide controller, don´t connect external voltage !)

That information was found here... https://www.rcgroups.com/forums/showthread.php?1614786-Brushless-Sensored-Motor-Standard-Pinout

Yes I try with another sensor cable and problem still persist.

I try the motor (and sensor cable) with TBLE-02s (tamiya original ESC) and work very good without any problem (with this tamiya ESC if cable have problem, motor do not start to run and ESC go in faut condition)

Continuity testing, if performed without any power, 99% should not damage products because current use to test continuity is very low compared to maximum breakout reverse current (at least.... I supposed it! In my experiency all works right in this way!)

Thanks very mutch for explanation of pinout of sensor cable, I not supposed it have this function... I always supposed are something different...  Why duplicate phase A,B and C??? Maybe for have feedback and verify any distortion? Mmmm.... So the only important info is the temperature with a resistive sensore temperature NTC10k ....

2 hours ago, Jonathon Gillham said:

I have had a couple of issues with ESC's, not sure if they will help.

The first was the ESC needed calibrating to the Tx.  This was a Trackstar setup.  It was such a pain to do, took me ages but once I got it done it has worked fine ever since.  Prior to getting it done it behaved how I've been told a sensorless would behave, a lot of cogging at low speed, but also would do random things like take off when you weren't expecting it etc.  Funnily enough some of these symptoms are the same as a faulty sensor cable, so I tried that too but it was the calibration.

The other was without a sensor cable my Speed Passion ESC/motor combo would run but very slowly.  Yes, I forgot to plug in the sensor cable in my rush to try out the new toy.  I was so disappointed with Speed Passion, until I realised my mistake.  I was surprised that it ran at all.

So, the link says that its sensored/sensorless but I wonder if it really is?  Is it SkyRC or Gool RC since the link says its both?  I've never had either but I thought the Gool RC is sensorless, but the SkyRC is sensored.  If it works without the cable is it running at the speed you would expect?  It may be a sensored motor (since it runs on TBLE02S) with a sensored/sensorless capable ESC in sensorless mode?

Very interesting the calibrating issues... How you calibrate your esc? I suppose motor not need to be calibred because if I attach my motor to other ESC work very very very right (or maybe is not this the problem in my specific case)

I have another motor brushless to test and it is a gool RC and it is sensored (otherwise will not work with my TBLE-02s) and works very good with TBLE-02s and have the same identical problem like other motor if I connect to SkyRc ESC. 

Note that: If I disconnect sensor cable from SkyRc ESC all motor works well. If I use senosr cable and reproduce problem , so i place motor in the condition that not turn anymore neither forward neither backward, if I disconnect cable the motor magical start to work. I suppose because ESC recognise that sensor cable il not still present and start a regulation without feedback of sensor, so work right!

thanks,

Massimiliano