SZZS specific CEF50-main thread (initial builds and troubleshooting related only)

[92se-r]

sure, air is mostly a insulator, and on the TSDz2 motor, they found that there was a poor 'thermal path' for the heat to travel to the outside, as the hot bits, did not connect to the metal case well, in this case, the parts of the motor was over heating, as it could not dissapte the heat well, in this case of the TSDz2, it would thermal regulate its self.
After heatsinking pads was added. that came in contact with the case, the issue was fixed, not saying this is happening, just it might still be a possablity till we count out.

Missing a gap pad is just a terrible design but what does that have anything to do with a cold motor? Or are you saying the motor housing being cold is caused potentially by a missing gap pad? That i agree with, thats why im hoping to get some pics to troubleshoot.

 

[Ktronik]

Missing a gap pad is just a terrible design but what does that have anything to do with a cold motor? Or are you saying the motor housing being cold is caused potentially by a missing gap pad? That i agree with, thats why im hoping to get some pics to troubleshoot.

in this case, I was meaning a cool motor shell, after use, may not mean motor is not overheating some chips on board, as it could be due to unpotted electroincs, it might be a possability till we have a good look inside....

at work we always use a thermal camera so we can tell if we are hitting thermal regulation on the chips we use... if needed we add better thermal paths or extra heatshinking, I know this was the case some motors in the past, so its worth looking into.

I would not expect this to happen on low power, but if on higher power, it happens, then it might be worth looking at

maybe there are some pics of it open around???

 

[Ktronik]

when we design LED lighting, we want the case to be warm, this shows we got the heatshinking and thermal path correct, if its cold, then we stuffed up and it will cook itself on the inside...

 

[brbr]

Guys, I see a lot of new versions for firmwares in 36 and 48V but nothing for 43V.
Do you know if we have a recent for 43V?

 

[Myalteregohamish]

So it works for a few seconds and stops? Once you leave it off for a bit, it allows you to go for a few seconds again before it stops?

Well now it does nothing at all. I’ll power it up in the morning and see if anything’s changed.

 

[92se-r]

Well now it does nothing at all. I’ll power it up in the morning and see if anything’s changed.

In my experience, if they do not do thermal calculations properly, you can run into overtemp conditions that can compromise thermal transfer pads, depending on which type is used. Some have a soft substrate that can run if it is overtemped, causing an air gap eventually. Thermal grease can also exhibit similar behavior. Thats why i am so interested in taking a look inside the unit.

 

[Ktronik]

In my experience, if they do not do thermal calculations properly, you can run into overtemp conditions that can compromise thermal transfer pads, depending on which type is used. Some have a soft substrate that can run if it is overtemped, causing an air gap eventually. Thermal grease can also exhibit similar behavior. Thats why i am so interested in taking a look inside the unit.

for what is worth its a inrunner motor, at least its not a out runner, so I am guessing this is part does not have a heat issue...

 

[92se-r]

for what is worth its a inrunner motor, at least its not a out runner, so I am guessing this is part does not have a heat issue...

View attachment 134148

Im more concerned about the motor driver

 

[Ktronik]

In my experience, if they do not do thermal calculations properly, you can run into overtemp conditions that can compromise thermal transfer pads, depending on which type is used. Some have a soft substrate that can run if it is overtemped, causing an air gap eventually. Thermal grease can also exhibit similar behavior. Thats why i am so interested in taking a look inside the unit.

I think this is a M820's inside.... worth adding some conformal coating if there is none...

 

[calvintys]

You can test the torque sensor functioning ? how ? since the M510 i can't read torque sensor characteristic and calibrate it.

I just tested both besst function yesterday and its pass the the test. Maybe u can try this. There another motor diagnostic function but i am lazy to test it because i need to rise my rear wheel up n pedal it.

 

[patdam]

I just tested both besst function yesterday and its pass the the test. Maybe u can try this. There another motor diagnostic function but i am lazy to test it because i need to rise my rear wheel up n pedal it.

View attachment 134151

thanks. wich rev of besst software you have ?

 

[calvintys]

thanks. wich rev of besst software you have ?

I download my besst pro from github. Only one version available for download

Bafang_M500_M600/BESST/dist at main · OpenSourceEBike/Bafang_M500_M600

Contribute to OpenSourceEBike/Bafang_M500_M600 development by creating an account on GitHub.

github.com

 

[Ktronik]

I download my besst pro from github. Only one version available for download

Bafang_M500_M600/BESST/dist at main · OpenSourceEBike/Bafang_M500_M600

Contribute to OpenSourceEBike/Bafang_M500_M600 development by creating an account on GitHub.

github.com

and this version still needs correct password ect???

 

[calvintys]

and this version still needs correct password ect???

I use python script. Basically follow the step below..

 

[spokémon]

Is there a way to tune the M820 motor overrun? The motor seems to keep running a second after she stops pedalling.

Sometimes my wife even has to brake while pedalling uphill around a corner

 

[calvintys]

Is there a way to tune the M820 motor overrun? The motor seems to keep running a second after she stops pedalling.

Sometimes my wife even has to brake while pedalling uphill around a corner

Lower the power and u should have this problem solve, i dont feel it on E or reduce acceleration timing by using Bafang go+ or besst.

 

[Myalteregohamish]

Lower the power and u should have this problem or reduce acceleration timing by using Bafang go+ or besst.

I have the same question to, seems like no matter what the acceleration is at, the over run is still a second after pedaling stops. I also have to use my brake to control it.

Is the 510 the same?

 

[patdam]

I have the same question to, seems like no matter what the acceleration is at, the over run is still a second after pedaling stops. I also have to use my brake to control it.

Is the 510 the same?

which controller software rev you have ? i don't feel that with the 2 48V that i have tested.

 

[thaeber]

I have the same question to, seems like no matter what the acceleration is at, the over run is still a second after pedaling stops. I also have to use my brake to control it.

Is the 510 the same?

There is a slight overrun, but not for 1 second. It’s easy to get used to it, just learning to use the extra push to overcome obstacles. I like the behavior very much…

 

[calvintys]

My 48v don't feel it on E mode but on T, i does feel the overrun n i do enjoy it during climb when my foot its down and it basically help me to push the bike up.

 

[giczalec]

Have 2 ebikes for sale. Based on CEF50 and 860Wh (LG 21700-M58). Blue one are L and came with 5A charger, Green one are M and 2A charger. BLue has 70km odo (demo bike), green one 1km odo. They were just for photos and small test for big customer from Saudi Arabia. Could offer green one for 2800 EUR/netto and blue one for 6100 EUR/nett
The spec of ble one are neat. incl full carbon parts liek Roval rims, analog carbon handlebar, Lupine Headlight set, wireless shifting
Shipping around the world.

 

[sandnap]

There is a slight overrun, but not for 1 second. It’s easy to get used to it, just learning to use the extra push to overcome obstacles. I like the behavior very much…

100%. My first bafang emtb also has this and it threw me off at first but now I pedal up to the obstacle (rocks for me), level the pedals, and up and over you go! No pedal strike.

 

[thaeber]

Have 2 ebikes for sale. Based on CEF50 and 860Wh (LG 21700-M58). Blue one are L and came with 5A charger, Green one are M and 2A charger. BLue has 70km odo (demo bike), green one 1km odo. They were just for photos and small test for big customer from Saudi Arabia. Could offer green one for 2800 EUR/netto and blue one for 6100 EUR/nett
The spec of ble one are neat. incl full carbon parts liek Roval rims, analog carbon handlebar, Lupine Headlight set, wireless shifting
Shipping around the world.

View attachment 134244 View attachment 134245

Hmm…on FB You offer the blue bike for 5.999€ with 50km on it. Mistake?

 

[giczalec]

Here have better price
Odo is 50-70km. Does it matter 20km?

 

[thaeber]

Here have better price
Odo is 50-70km. Does it matter 20km?

Don’t get me wrong mate, just wanted to give You a hint about the missmatch. Many of us on the forum are on FB as well. And 6.100€ here is not any better then 5.999€ on FB..

 

[92se-r]

Ship finally arrived stateside. You guys remember how long it took to clear customs?

 

[mike_kelly]

Do you really want to know?

 

[92se-r]

Do you really want to know?

yes? This is excrutiating

 

[mike_kelly]

I'm sorry. I am just not in to inflicting pain on others.

 

[Neeko DeVinchi]

This is how I prefer to run my M820 on my CEF50

My startup angle is set so that the motor engages instantly. But the acceleration has been dialed back to give the motor more of a natural feeling. I use a 32t chainring and see no point going higher (imo).
Truth be told, I find that I use thr bike overall in level 2-3 (Sport & Sport+). Boost is for riding with full-fat emtbs for fire road climbs