So I probably blew my controller.
It's an EB306 with 4110 fets from em3ev. Motor is 8 turn Bafang BPM.
I was going full throttle at 74V battery voltage and about 35 to 45 phase amps (45 to 60 km/h) with this poor boy for about 3 kilometers when power suddenly cut off.
I pedaled home and took some measurements.
Battery was OK at about 76V.
Throtte was 5V in and about 0.9-4.2V out...OK.
Hall signals were all varying between 4.4V and zero... OK.
But when I turned the motor backwards, I felt resistance. I disconnected one phase at a time and when yellow was off, cogging was gone. So the motor was okay.
Opened the controller. Nothing burnt. All nice and shiny.
Checked conductivity of mosfets and the mosfet closest to wire exit was shorted between drain and source, although it was not burnt visually.
If my assumption is correct, I should be able to fix this by replacing this mosfet. Also, it was the yellow phase, so motor cogging was caused by shorted phase.
Now where to get a single 4110 mosfet, and how to replace it with standard soldering iron?
It's an EB306 with 4110 fets from em3ev. Motor is 8 turn Bafang BPM.
I was going full throttle at 74V battery voltage and about 35 to 45 phase amps (45 to 60 km/h) with this poor boy for about 3 kilometers when power suddenly cut off.
I pedaled home and took some measurements.
Battery was OK at about 76V.
Throtte was 5V in and about 0.9-4.2V out...OK.
Hall signals were all varying between 4.4V and zero... OK.
But when I turned the motor backwards, I felt resistance. I disconnected one phase at a time and when yellow was off, cogging was gone. So the motor was okay.
Opened the controller. Nothing burnt. All nice and shiny.
Checked conductivity of mosfets and the mosfet closest to wire exit was shorted between drain and source, although it was not burnt visually.
If my assumption is correct, I should be able to fix this by replacing this mosfet. Also, it was the yellow phase, so motor cogging was caused by shorted phase.
Now where to get a single 4110 mosfet, and how to replace it with standard soldering iron?
