I have noticed a strange phenomenon when riding my recumbent commuter in 120% throttle mode. It seems much more quiet than when at 100% or less.
For background, my commuter is detailed in this thread: http://www.endless-sphere.com/forums/viewtopic.php?f=6&t=57751#p899059
The setup, as per my sig is a 6Fet Infineon @ 25A, with 15AH 16S LiFePo4. The motor/wheel is a '1000w' golden motor in a 20" rim, radially laced. I have my 3 speed switch set to 67-100-120% throttle. At 120% throttle I can hit about 55-60kph.
Now before people say, how can you tell it's quieter whem your moving through the air faster and there is more wind noise etc, I will say this...I have been riding this bike almost every day for the last 6 weeks since building it. I would not be claiming it is quieter unless I was sure. I was recently riding with a very strong tail wind and the air around me was practically still while I was doing ~55-60kph. It was at this point I was sure I wasn't just imagining it...the bike is virtually silent at 120%! This compares to your typical electric wine when riding at 100% throttle.
I'm just curious as to why this might be happening? I know that the main reason sine-wave controllers are silent is due to the lower push-pull effect on the motor magnet ring, but why would a square wave controller over-driving be almost as quiet if not just as quiet as a sine-wave? :?
Cheers
For background, my commuter is detailed in this thread: http://www.endless-sphere.com/forums/viewtopic.php?f=6&t=57751#p899059
The setup, as per my sig is a 6Fet Infineon @ 25A, with 15AH 16S LiFePo4. The motor/wheel is a '1000w' golden motor in a 20" rim, radially laced. I have my 3 speed switch set to 67-100-120% throttle. At 120% throttle I can hit about 55-60kph.
Now before people say, how can you tell it's quieter whem your moving through the air faster and there is more wind noise etc, I will say this...I have been riding this bike almost every day for the last 6 weeks since building it. I would not be claiming it is quieter unless I was sure. I was recently riding with a very strong tail wind and the air around me was practically still while I was doing ~55-60kph. It was at this point I was sure I wasn't just imagining it...the bike is virtually silent at 120%! This compares to your typical electric wine when riding at 100% throttle.
I'm just curious as to why this might be happening? I know that the main reason sine-wave controllers are silent is due to the lower push-pull effect on the motor magnet ring, but why would a square wave controller over-driving be almost as quiet if not just as quiet as a sine-wave? :?
Cheers