小牛电动
Niu Electric
- 61 -
and run the motor continuously for more than 10 seconds.
Read the measured voltage U2 when the multimeter value becomes stable.
Standard: ≤ 1V
The measured voltage U2 that is ≤ U1 indicates that the motor insulation is normal without creepage.
The measured voltage U2 that is more than 1V indicates that the motor insulation is bad. The motor
assembly should be replaced.
Inspection of the maximum motor no-load current
Set up the kickstand on flat ground.
Check the battery pack voltage and perform full charging.
Turn the ignition switch to OFF. Set the multimeter at the shift of 20A for DC measurement. Connect the
probes (+) and (-) with the input wire to controller power supply in series.
Turn the ignition switch switch to ON. Release the shift P. Record the maximum value A1 of the
multimeter current.
Turn the accelerator handle to the maximum angle. Record the maximum value A2 of the multimeter
current after the motor has operated stably for 5 minutes.
Calculate the maximum motor no-load current A.
Calculation: A= A2 - A1
Standard:
≤ 3.5A
The measurement value that is more than the standard one indicates that the motor assembly may be in
a bad condition as blow:
1. The internal motor friction increases
- The bearing is damaged
- The stator interferes with the rotor
2. The motor winding is shorted locally
3. The magnetic steel is aged, demagnetized or falls off
Inspection of the Hall motor sensor
Remove the storage box.
Inspection of the signal output
Turn the ignition switch to OFF.
Connect Hall phase output wires and negative ground wire of the motor. Turn the ignition switch to ON.
Manually turn the rear wheel and check the DC voltage between both.
Connection: Yellow (+) -
negative wire (black) (-)
Green (+) -
negative wire (black) (-)
Blue (+) -
negative wire (black)
Standard: 0 - 5V
The voltage of each phase should change between 0 and 5V. The voltage that does not change
indicates that the corresponding Hall motor sensor failed.
Inspection of the ground wire
Remove the storage box.
Check the connectivity between the black wire of Hall motor connector and the negative battery pole.
Summary of Contents for N1S
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