Hi, I'm trying to use a Flipsky 75100 for a folding e-bike that I have turned into a mobility scooter. I am using a 52v 20Ah li-ion battery with a 14" 1500w rear hub motor. Which is for being able to get anywhere without having to get off and push it uphill. Everything is fine on the bench but as soon as I sit on it and try to pull away it takes a long time to speed up on a flat surface. I haven't even tried going uphill yet. I have been reading about the parameters and other settings and gradually changing them at small increments so as not to damage anything but I'm getting nowhere. Does anyone have any suggestions please as I'm at a loss right now.
I'm using FOC sensorless with a twist throttle grip. I haven't even connected the brakes yet.
Ian
Can be a multitude of things and it's hard to tell without any specific details about the whole system but it sounds like you are not pulling enough amps to generate the torque required to move the gross weight of the vehicle. Can be the battery limitations, bad wiring, controller not configured correctly, motor not sized up for the required gross weight, and/or a lot of other things.
NextGen FOC High voltage 144v/34s, 30kw (https://vesc-project.com/node/1477)
I had a trike with a 2000W motor and a 16s (60V) battery. Therefore, my maximum current should be approximately 2000/60 = 33.3A. However, I discovered that this was far too low; I needed to use at least 66A to achieve a satisfactory speed. When going uphill, I had to increase the current to 80A or more. Naturally, I was quite concerned about burning out the motor, so I made sure to exercise caution and check the temperature frequently during my tests. If you have the datasheet for your motor, look for the peak power value. If your motor is of good quality, this value might be significantly higher than the nominal power.
The nominal power provides an idea of the average current your motor should use most of the time. However, you'll need to exceed this value in certain situations if you want additional power for acceleration and climbing hills.
Hi, sorry for the delay but I've been busy elsewhere. I followed your advice and upped the amps to 80 max 100 and my bike now goes wherever I want it to without any problems regarding overheating and I was very cautious to begin with by checking every time I went up a steep hill or for a long run out. So thank you for your advice because I would never have done that for fear of burning out my motor. A couple of months later and all is well.
Ian
Hi, sorry for the delay but I've been busy elsewhere. I followed your advice and upped the amps to 80 max 100 and my bike now goes wherever I want it to without any problems regarding overheating,and I was very cautious to begin with by checking every time I went up a steep hill or for a long run out. So thank you for your advice because I would never have done that for fear of burning out my motor.
A couple of months later and all is well.
Ian