En av våra testobjekt, en Biltema Yosemite LowStep 3, med följande motor. Motor sannolikt tillverkat av Shengyi

Based on info below

Kv:
Number of pole pairs (calculated):68.8
Rs:
Ls:

Liknande motor från Shengyi

High Speed Brushless Motor Hub (V/Disc Brake)

Magnet rate:16Poles,20Poles

Reduction gear ratio:1:4.3

Hall sensor:With/Without

Testobjekt 2, en mittmotor från

Tongsheng |TSDZ2 |

Data on open sourcebikefirmware

Calculated values for 36V motor

Let’s make some assumptions and deductions:
1. Lower voltage electromagnetic components have fewer turns per winding. The number of turns is directly proportional to applied voltage.

So, the ratio of turns between 36V and 48V is 36/48 = 3/4.

2.Inductance is proportional to the square of number of turns, so the ratio of inductance is therefore 3*3/4/4=9/16.

3.Assume the 36V motor follows these rules.therefore, its inductance is: L = 135uH * 9/16 = 76uH

4.Resistance is directly proportional to number of turns, so the 36V motor resistance is: R = 0.125 * 3/4 = 0.094ohm

Experiments done with the 36V motor, 8 pole pairs, 4000 RPMs. ==> ev Kv 111,111
Motor has 8 poles, so the measured speed in RPMs = 60 / (0.00194 * 8) = 3866 RPMs.

Reduction gear ratio: 1:41.8 | source1 ]
Theoretical values (how to calculate Phaserunner page 7)

Numbers of Pole pair (calculated): ? 8 x 41,8 = 344,4

Kv: 111,11 RPM/V
Number of pole pairs (calculated):344.4 
Rs: 94 mOhms
Ls: 76 uH

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