小牛电动
Niu Electric
- 60 -
Is the failure eliminated?
Yes
- the controller failed
No
- go to step 4
4. Motor inspection
Perform inspection by motor switching as per the elimination method.
Is the failure eliminated?
Yes
- the motor failed
The motor is shaking
The Hall motor sensor connector is in a bad contact
The Hall cable sensor connector is in a bad contact
Out of control (the scooter flies)
The accelerator cable is too tight and it is tensioned. The Hall cable sensor works.
The Hall cable sensor failed
The controller failed.
The motor noise is big
The bearing is worn
The rotor interferes with the stator
The magnetic steel is loosened and falls off
Inspection of the motor winding resistance
Disconnect 3 phase wires (thick blue, green and yellow wires) in the motor cable
from the controller connector as shown in the figure.
Check the resistance between phase wire connectors at one side of the motor.
Connection: Phase wire - phase wire
Standard: 1.2±0.2 Ω
Replace the motor assembly if the reading is far more than the standard value.
Inspection of the motor insulation (creepage)
Set up the kickstand stably on a flat ground.
Check the battery pack voltage and perform full charging.
Turn the ignition switch to OFF. Set the multimeter at the shift of AC voltage measurement. Connect the
probe (+) to the negative wire of vehicle charger socket or the negative battery wire. Connect the probe
(-) to the motor shaft.
Turn the ignition switch to ON. Release the shift P. Turn the accelerator handle to the maximum angle
and run the motor continuously for more than 10 seconds.
Read the measured voltage U1 when the multimeter value becomes stable.
Standard: ≤ 1V
The measured voltage U1 that is ≤ 1V indicates that the motor insulation is normal without creepage.
If the measured voltage U1 is more than 1V, then the inspection in the next step is performed.
Turn the ignition switch to OFF. Short the vehicle saddle lock and rear bottom fork with a short wire.
Turn the ignition switch to ON. Release the shift P. Turn the accelerator handle to the maximum angle
Summary of Contents for N1S
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