How many magnets in a 20 in wheel

[Steve in Spain]

Hi
Im trying to set up an S866 display on my ebike,its asking me how many magnets in my (rear) hub motor,its a cheep Chinese model which im trying to upgrage from 24 to 48 v using a new battery and display combo,its probably been sat on the guys warehouse shelf for a long time so nothing new or fancy,i doubt its overly important but i was wondering what is my best bet to enter( if it makes it faster or pull harder im not going to complain,hint /hint/nudge/wink /wink /!)oh yes its 20 inch wheels remember.
Thanks for your time
Steve

 

[AngryBob]

The magnets are not in the wheel, they are in the motor, and since you have given no information whatsoever of the motor, type, or brand, my guess is .....42 !

 

[Steve in Spain]

Thanks,by saying wheel i meant the whole unit including the moter ( kind of took that for granted), thanks for the info,i seem to have blown the darned thing up now,see my latest dumb question re-that,im an old guy trying a new interest and fully admit i dont know what im doing,like the man said if it aint broke fix it till it is,something like that,anyhow if i get out of this latest problem ( have to somehow or ive lost a stack of money i cant afford) i will try 42, after all according to hitch hikerr guide to the galaxy it was the answer to everything.
Steve

 

[John in CR]

I believe that 23 pole pairs is the most common for direct drive hubmotors, so 46 magnets is the one I'd try.

 

[Steve in Spain]

Thanks that would be my guess also actually,just by deductive guesswork,there do not appear to be any markings on the " hub motor" like i said its probably an older cheap job.
Steve

 

[amberwolf]

With the motor connected to the controller, and power on, put your voltmeter red wire on any one of hte hall signal wires, and the black meter wire on the black hall ground wire (or battery negative).

Turn the wheel so it is valve stem straight up. Rotate the wheel by hand slowly one complete revolution, until it is again straight up, while carefully watching the voltmeter. Count the number of times the display changes from around zero volts to around 5v.

That is the number of poles.

If it is a geared motor, you have to rotate the wheel backwards instead of forwards.

 

[Steve in Spain]

Thanks for that mate ,sounds like good advice,sorry for not replying sooner,i have only just gotten back to this site after giving up and awaiting my replacment parts.