9FET means less heat than the 6FET. And it's less likely to die on you. Both are limited to 25A current. The 9FET just handles it better. That's basically the difference.Rider2000 said:Oh, i ordered in the change time.... hope I get the 9FET Controller...
Do you think the difference is graet ?
Btw: 9FET means what ? Is it a better AD converter resulution ?
Rider2000 said:I did not get my Bafang BBS01 engine yet, hope it arrive soon So I have time to think...
Thanks !
No. No reported controller problems that I've read.Rider2000 said:Oh , yes BBS01. Is it the similar Story for this one ?
This is the printing on the rear:
1306270031 , 36V 18A , 25km/h
I went for this one:Rider2000 said:I don't like to buy a cable and cut it.
The 3 poles in the motor use 3x2Fets=6 Fets. Where do they use the other 3 for? I presume the bafang uses 3 poles(in star) for the brushless sytem.Rider2000 said:Btw: 9FET means what ? Is it a better AD converter resulution ?
bgt said:The 3 poles in the motor use 3x2Fets=6 Fets. Where do they use the other 3 for? I presume the bafang uses 3 poles(in star) for the brushless sytem.
During partial throttle, one bank of the high side FETs is switching on/off at the PWM frequency, which is typically 10-20kHz. When the high side turns off, the collapsing magnetic field will try to circulate current through the body diode of the opposing low side FET. Since the voltage drop of the body diode is much greater than the voltage drop across a FET that's turned on, it will generate more heat. By using 2 parallel FETs on the low side, the heat dissipation will be a little more even.
Postby jpo » Mon Oct 20, 2014 11:07 am
Now that we know how to program the BBS0X the next question is what works. Cellman's experience is the. stock setting are good. I was hoping to improve PAS. Get a little more assist out of PAS to discourage going to the throttle. Maybe even remove the throttle is it work good enough.Does anyone feel like they've found the magic combo? I'm fairly happy with the stock programming, but feel like it could be improved. Has this information been compiled somewhere other than this page
Thanks
Joe
jpo
100 mW
100 mW
Posts: 40
Joined: Sun Aug 29, 2010 11:48 am
Location: San Francisco California
That is so true. I hope they will make a torque sensor one also in future. But maybe for this type of housing it is impossible????geofft said:as long as you accept its limitations.
I read constantly and try and follow, but due to a stroke lose track. However I'm certain I read Bafang has done just that. I'm trying to find the link...geofft said:Hopefully in future models Bafang will include some torque sensing for better PAS operation, I'm guessing however that this may require new software to operate it so I'm thinking it won't be a retrospective upgrade. In the meantime what we've got works reasonably well as long as you accept its limitations.
Yes, but thats for Bosch like frames, not the standard bikes where you replace the crancks with the BBS-0X midmotors.tomjasz said:I read constantly and try and follow, but due to a stroke lose track. However I'm certain I read Bafang has done just that. I'm trying to find the link...EDIThttp://www.energiecycles.com/#!news/c12oa"Bafang just showcased the newest mid-drive system with a combined torque and speed sensor that is in pre-production. The prototype at the show gave everyone a glimpse. The challenge is that it requires the similar bottom bracket mount change found on the majority of other mids such as the Bosch system."geofft said:Hopefully in future models Bafang will include some torque sensing for better PAS operation, I'm guessing however that this may require new software to operate it so I'm thinking it won't be a retrospective upgrade. In the meantime what we've got works reasonably well as long as you accept its limitations.
The programming that Kepler provided works great. I use it and don't have a throttle. I have almost 500 commute miles on the bike.jpo said:Now that we know how to program the BBS0X the next question is what works. Cellman's experience is the. stock setting are good. I was hoping to improve PAS. Get a little more assist out of PAS to discourage going to the throttle. Maybe even remove the throttle is it work good enough.Does anyone feel like they've found the magic combo? I'm fairly happy with the stock programming, but feel like it could be improved. Has this information been compiled somewhere other than this page
Thanks
Joe