I am new to this forum and I may have first posted this problem in the wrong spot in General discussion. I recently purchased a Stromer ST1. I am experiencing excessive noise and grinding when starting off or going up hills. I was just wondering if other Stromer ST1 owners have experienced the same thing. Stromer informed me that some noise is to be expected for the ST1 motor. Apparently the more you pay for the bike the better the motor gets the quieter it is. However this noise does seem quite excessive.
Problems with my new ST1
- Thread starter Raa
- Start date
Ravi Kempaiah
Well-Known Member
- Region
- Canada
- City
- Halifax
Steve Plattner
Member
My ST-1 does make some noise when going up a steep hill using the higher power settings. Sort of a groaning sound, but never loud or bothersome. It's been that way since day one. I only hear it when the motor is really being challenged on a steep uphill climb, never on flat ground or downhill. Not sure how loud yours is, but worth having dealer check it out. Good luck.
N
Nestor
Guest
I live in Vancouver, BC - a mountainous terrain and I could not get up the hills without an electric bicycle. Just bought a StromerST-1 S almost new, with the 522Wh battery and this is what I have observed:
- when I start with a fully charged battery (100% - 95%) whenever I used pedal assist uphill, there is a heavy motor vibration/noise that actually works adversely - I mean not even helping at all.
- when the battery change drops bellow 95%, it works flawless (meets my expectations).
I called a dealer and they explain to me that when the Li-ion is fully charged its voltage is higher (dah!) and that makes the motor/controller turn on/off more often - I guess some low frequency PWM there. I have electronic understanding and I still believe that there is a problem with the motor control loop - possibly in the software.
>>>> The dealer suggested this is a common problem and we should not press to hard on the pedals (ask less of the pedal assist) or change to lower gears when the battery is more than 95% charge. What a pity, I still believe this could be fixed by software, but no-one would do that ... I could try to do something about it, but need their source code, compiler and a way to update software. Well, the bike is great otherwise !
- when I start with a fully charged battery (100% - 95%) whenever I used pedal assist uphill, there is a heavy motor vibration/noise that actually works adversely - I mean not even helping at all.
- when the battery change drops bellow 95%, it works flawless (meets my expectations).
I called a dealer and they explain to me that when the Li-ion is fully charged its voltage is higher (dah!) and that makes the motor/controller turn on/off more often - I guess some low frequency PWM there. I have electronic understanding and I still believe that there is a problem with the motor control loop - possibly in the software.
>>>> The dealer suggested this is a common problem and we should not press to hard on the pedals (ask less of the pedal assist) or change to lower gears when the battery is more than 95% charge. What a pity, I still believe this could be fixed by software, but no-one would do that ... I could try to do something about it, but need their source code, compiler and a way to update software. Well, the bike is great otherwise !
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