Broken hall sensor on a hub motor?

[-UP-]

I've been riding a 1000W front hub motor kit for a couple of months now. I'm planning to add Arduino to it for speedometer / speed limiter / cruise control etc..

I checked the signal from the hall sensors and one of them is on the high state all the time. The motor still running smoothly. Probably a broken sensor, is this common on these Chinese hub motors?

Also when I'm driving full throttle, there is sometimes a whining/howling sound, like echoing/metallic sound. I think it happens mostly, when the battery isn't full, throttle is full open, but speed is not yet at top speed. Could this be related to the broken hall sensor?

 

[-UP-]

Thanks, maybe I'll replace the sensor(s) next time I'll change the tire. The thread is wearing quickly..

 

[Ykick]

How much current (Amperes) does the controller/motor draw from the battery when spinning full speed in free air? (Wheel off the ground)

 

[-UP-]

My current clamp showed 0.45A DC and 0.66A AC.

 

[Ykick]

My current clamp showed 0.45A DC and 0.66A AC.

AC current? What are you measuring, phase power wires?

Full throttle, no load battery current of no more than 2-3A DC indicates there's not a motor timing issue.

 

[-UP-]

AC current? What are you measuring, phase power wires?

Full throttle, no load battery current of no more than 2-3A DC indicates there's not a motor timing issue.

I measured battery wires (between battery and controller). I was surprised to find this AC current, too.