determining pole count

[Tom_Cook]

Does anyone know a simple method for determining the pole count of a geared hub motor without having to open it?

 

[bowlofsalad]

Does anyone know a simple method for determining the pole count of a geared hub motor without having to open it?

Ask the manufacturer. Maybe mention the motor here and hope someone else knows already? There is a chance someone else has opened your motor before.

 

[Tom_Cook]

The Motor has a sticker on it which says Tongde Electric tdm 2w1.

That does not give a good indication though, as they put the same sticker on different types of motors, even direct drive version :?

So... I was kind of hoping for a trick with the hall sensors, fase wire cables or similar..

 

[John in CR]

I take it that this is for calibration of a CA. If so, simply make sure your wheel size is correct, ride a known distance, and adjust the pole count accordingly. If you have a separate speedometer you could do it using speed instead of distance. There are probably smartphone apps to measure rpm, which would also work in combination with elementary math. One of my CA's is old enough that it can't accept the high pole count of some modern motors, so I have to adjust the wheel size and pole count to numbers that aren't real for the CA to output correct speed and distance.

 

[teklektik]

Does anyone know a simple method for determining the pole count of a geared hub motor...?

If this for a CA or similar device, you will find that the gear motor freewheel clutch will cause all speed, distance, and derived calculations (e.g. Wh/mi) to be in error.

• 
  If a freewheel clutch is present, rotation signals must be obtained via wheel pickup - not motor hall sensor.

If this is for a CA, you should have purchased a CA-DPS (S=speed pickup). However, version 2 or 3 CAs can be converted between DP and DPS models easily.

• For version 2.3 and 3.x see "Appendix B. Add/Remove Wheel Speed Pickup Sensor" of the V3 Unofficial Guide.
• The procedure for earlier 2.x models is similar, see the PCB layout at the end of the corresponding User Manual and use the general directions in the V3 Guide.

You can obtain a sensor from Grin Tech or use a sensor from an inexpensive bike computer. These are non-polarized two-wire reed switches (signal, Gnd).

Set 'pole count' to the number of spoke magnets (usually 1).

 

[Tom_Cook]

Thanks for the explanation, much appreciated.
The problem I am trying to solve is not about the CA though, but parts of your advice may still be applicable.
I'm trying to make a motor work together with a Zhipu controller connected to a display like this.

I think I have the wiring figured out and now I am trying to figure out the settings.
One more question: does anyone know what magnet type 4, 8 or 14 does or stands for?