Praskal,
I have the ElectricRider Roadrunner (Ctlye 408) which I am running at 48 volts. It always vibrates under heavy amperage (over 15 amps) but is dead smooth and quiet below 8-10 amps. I have noted these amps with a WattsUp meter. Under high current draw at lower speeds it is normal for that motor to vibrate BUT it should smooth out completely once current drops as speed stabilizes. I have about 2,500 miles on my motor and there has been no change with regards to the vibration getting better or worse and it has always smoothed out competely once the amps drop off with speed increase. Does your motor vibrate under all conditions? If it vibrates under all conditions I believe you have a problem. If only under heavy load at lower speeds, it's normal. From the thread so far you seem to be indicating it vibrates only under heavy power. Believe me that little 408 can suck amps. A friend of mine took a test ride and spiked it at 44.5 amps (Battery voltage sagged to 45 volts on that one).
Now regarding voltage drop I have a 48v 20ah Ping battery. At just over 2C (44.5 amps) current my voltage sagged to 45 volts from 53 volts. The older Pings and other duct tape units are really nominal 1C batteries. You said you have a 10ah battery. If you are going heavy on the throttle you could easlily maxing your controller at 2.5C current! Not good for a duct tape battery but not a problem for the better cell units (Headway, A123 packs, Lifebatt, etc). Depending on your battery you could be sagging your voltage so low that it might be contributing to the vibration under heavy current.
In my case at WOT on the flat with no wind I go 24 mph and draw 13 amps (about 25 wh/mile). At 13 amps I am just beginning to notice the start of the motor vibration.
Hope this is some reassurance.
Be safe,
Bill
In my opinion from what I've heard your motor sounds normal for a 408
I have the ElectricRider Roadrunner (Ctlye 408) which I am running at 48 volts. It always vibrates under heavy amperage (over 15 amps) but is dead smooth and quiet below 8-10 amps. I have noted these amps with a WattsUp meter. Under high current draw at lower speeds it is normal for that motor to vibrate BUT it should smooth out completely once current drops as speed stabilizes. I have about 2,500 miles on my motor and there has been no change with regards to the vibration getting better or worse and it has always smoothed out competely once the amps drop off with speed increase. Does your motor vibrate under all conditions? If it vibrates under all conditions I believe you have a problem. If only under heavy load at lower speeds, it's normal. From the thread so far you seem to be indicating it vibrates only under heavy power. Believe me that little 408 can suck amps. A friend of mine took a test ride and spiked it at 44.5 amps (Battery voltage sagged to 45 volts on that one).
Now regarding voltage drop I have a 48v 20ah Ping battery. At just over 2C (44.5 amps) current my voltage sagged to 45 volts from 53 volts. The older Pings and other duct tape units are really nominal 1C batteries. You said you have a 10ah battery. If you are going heavy on the throttle you could easlily maxing your controller at 2.5C current! Not good for a duct tape battery but not a problem for the better cell units (Headway, A123 packs, Lifebatt, etc). Depending on your battery you could be sagging your voltage so low that it might be contributing to the vibration under heavy current.
In my case at WOT on the flat with no wind I go 24 mph and draw 13 amps (about 25 wh/mile). At 13 amps I am just beginning to notice the start of the motor vibration.
Hope this is some reassurance.
Be safe,
Bill
In my opinion from what I've heard your motor sounds normal for a 408
