hall sensor

[ade]

hi all a couple of questions maybe someone could answer i have just taken delivery of a BMS 350w e-bike kit and the kit has the option of being used with or without the hall sensor what is the difference ? is there any difference in performance ? my forks snapped on my alien special with the 250w motor so i decided to order two torque arms (especially with the higher torque motor )however the thickness of the torque arms means the bolt on the left side tightens on the axle over the cut out for the cable exit would this be ok? any info would be great

 

[flecc]

With the Hall sensors in use the take up from standstill will be smoother. Without them the controller relies on back emf as current is delivered to find the motor status, so there is some momentary snatching as the controller finds out what to do to drive the motor in the right direction. If you pedal off the mark or assist strongly off the mark this won't matter too much, but if you rely mostly on the motor from a standstill, it could seem harsh.

I can't say absolutely for your motor, but I have run a setup with the wheel nut in that position and barely fully threaded for three years without problems. As you'll see in the photo below, I even turned down the nut and recessed it into the frame to gain just enough thread, but even then the thread didn't extend right through the nut:

 

[jhruk]

hi all a couple of questions maybe someone could answer i have just taken delivery of a BMS 350w e-bike kit and the kit has the option of being used with or without the hall sensor what is the difference ? is there any difference in performance ?

Operationally using the hall sensors will give you a smoother start and is particularly noticeable in throttle starts from a standstill. The only advantage of not using them is simplification, with less to go wrong. Assuming your kit was supplied with wiring for the halls then you might as well connect them. If a problem arises you can always disconnect them and the BMS supplied controller will automatically switch to no-halls mode.

They used to offer their motors with a choice of three pin (no-halls) or nine pin (with-halls) motor connector when ordering, but it looks as if they now supply them all with the nine pin.

 

[ade]

ok great help thanks