Search found 159 matches

by obcd
Oct 29 2019 6:41am
Forum: EBike General Discussion
Topic: Does torque normally change with battery voltage?
Replies: 30
Views: 2666

Re: Does torque normally change with battery voltage?

It's not like I want to climb that hill at 25km/hr. So, if back EMF limitting the current isn't the issue reducing torque, there has to be something else on my bike reducing the current at lower battery voltage. If I read all comments correctly, there is no electrical limitation that explains such b...
by obcd
Oct 28 2019 6:33pm
Forum: EBike General Discussion
Topic: Does torque normally change with battery voltage?
Replies: 30
Views: 2666

Re: Does torque normally change with battery voltage?

I am searching for solutions using the stuff I have. The front fork is wider than most normal bike forks, so finding a replacement motor isn't easy. The system has a torque / pas sensor, and I like the way it works with that. The cabling is also nicely integrated in the frame. My next ebike likely w...
by obcd
Oct 28 2019 2:51pm
Forum: EBike General Discussion
Topic: Does torque normally change with battery voltage?
Replies: 30
Views: 2666

Re: Does torque normally change with battery voltage?

I see 2 possible options to always get the maximam possible torque. 1. Use a boost converter so that the motor always get's 40V. This has the disadvantage that the current drawn from the battery will increase. If we consider The 40V * 8A example, that's 320W Assume the converter efficency is 90%, th...
by obcd
Oct 28 2019 8:20am
Forum: EBike Technical
Topic: Low voltage problem
Replies: 5
Views: 724

Re: Low voltage problem

Does your voltage drops instantly or gradually. You could test the battery by connecting 4 12V hallogene spots in serie and using that as a load on the battery. The odds are small that both batteries are bad, but you never know. If the voltage drop is instantly, I would expect a bad contact somewher...
by obcd
Oct 28 2019 8:02am
Forum: EBike General Discussion
Topic: Does torque normally change with battery voltage?
Replies: 30
Views: 2666

Does torque normally change with battery voltage?

The title says it all. I have a gazelle Innergy 36V e-bike with a geared front hub motor. I only have to commute 3km to work, but there is a rather steep slope of a few hundred meters. That's where I get the impression that the motor pulls much harder with a full battery compared to when the battery...
by obcd
Oct 24 2019 5:53pm
Forum: EBike Technical
Topic: Bafang 850C color LCD, currently working for TSDZ2 motor -- Flexible OpenSource firmware
Replies: 191
Views: 29242

Re: Bafang 850C color LCD -- Flexible OpenSource firmware

Adding the needed c files manually to the makefile SOURCES did the trick. It's compiling and linking under windows now.
by obcd
Oct 24 2019 2:51pm
Forum: EBike Technical
Topic: Bafang 850C color LCD, currently working for TSDZ2 motor -- Flexible OpenSource firmware
Replies: 191
Views: 29242

Re: Bafang 850C color LCD -- Flexible OpenSource firmware

Thanks for the reply. I just noticed that the 850C/src folder c files aren't compiled and linked under windows. So, it's an issue with make not finding those files. I'll see if the tsdz2 makefile differences between windows and linux are any helpfull. In case I'll switch to linux, what version are y...
by obcd
Oct 24 2019 2:21pm
Forum: EBike Technical
Topic: Bafang 850C color LCD, currently working for TSDZ2 motor -- Flexible OpenSource firmware
Replies: 191
Views: 29242

Re: Bafang 850C color LCD -- Flexible OpenSource firmware

I am trying to set up the environment to compile the 850C firmware under windows 8. I have some virtual linux machines, but they are all 32 bit. arm-none-eabi-gcc wasn't available for 32 bit debian and compiling it from sources resulted in a large number of dependencies. I followed the instructions ...
by obcd
Jul 16 2019 4:03pm
Forum: EBike General Discussion
Topic: Help whit Gazelle BMS
Replies: 8
Views: 646

Re: Help whit Gazelle BMS

This threat is old but I nevertheless wanted to add some information. The blue wire from the BMS board (embedded in some black resin on the newer battery models) is the communication signal between the BMS board and the controller that is embedded in the front motor. I assume it's used to report the...