About overcurrent, in normal version 0.2.x I added some more checks to protect the motor. It uses some new internal parameters. It could be that I used to low limits. As said in some posts hereabove, I made a 860c version avoiding those new checks. I have not yet got a feedback on it.Not sure if this is helpful, but I decided to share my feedback about using test6_with_pll. I've been using it for a few weeks now. In general, it works well — assistance maybe feels smoother than before (main branch).
I saw overcurrent mentioned here, and I experienced it twice as well. What’s interesting is that these were not situations where I would normally expect overcurrent to happen. For example, once it stopped with an overcurrent error on a snowy hill. Because of going slowly on an "easy" gear, the slippery surface and spinning wheel, I wouldn’t expect current to peak.
While writing this, I had a thought about why it could happen. On an icy surface, the wheel could slip for a moment, making it impossible for my legs to follow the pedals fast enough. That could create an instant load increase on the motor, which might reasonably trigger overcurrent. One moment the motor spins easily because it’s slipping on ice with leg assistance, and the next moment it suddenly catches traction while my legs are not helping because they couldn’t keep up with the rapid slipping.
One more thing I wanted to ask about.
Yesterday I installed brakes with a braking sensor. It works very well, but I’m interested in what the braking signal actually means for the motor. Initially, I thought it just cuts current to zero, but now I’m not sure, because:
When I use the throttle to spin the wheel while not moving, and at the same time apply the brake, I can hear a click in the motor. At the same time, I see the front sprocket stop almost instantly, like something is actively braking it from inside the motor.
When I ride the bicycle with constant pressure on the pedals and press the brake lever just enough to send a signal to the motor (without actually braking the wheel), I can feel that click through the pedals. At that time, nothing visibly stops spinning because I’m still pedaling.
I would expect the braking sensor to behave like releasing the throttle — the motor would just quietly stop spinning. But since it behaves differently with the brake sensor, I’m really interested in what is happening inside, and whether using the brake during motor peak current or peak speed could harm the motor.
If someone has an easy explanation, I’d be happy to hear it
About the brake: when you apply brake, the motor is immediately disabled. I expect that all 3 low side mosfets become ON. It is like a short cut between the 2 windings. This stops rapidly the motor.
When you do not use the brake, OSF applies a deceleration and so the motor reduce current and speed progressively.
This seems me the more logic explanation.
