niu N-GT, Service Manual

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V1.0.0 64
Electrical System
Motor
The motor used in this scooter is an efficient brushless DC motor with a permanent magnet made of
rare earths, which is integrated with the rear wheel.
The motor does not require maintenance in daily riding. However, attention should be paid to the
status of installation and tightening nuts on the motor shaft.
The motor is integrated with the rear wheel. Attention should be paid to inspection of the tire
pressure during maintenance. Driving at insufficient tire pressure will cause damages to the motor
hub.
The motor should be stopped immediately when the motor is abnormally hot, smoking, smelling
abnormally, sounding abnormally or has other abnormal conditions.
Check the battery for normal performance and make it charged fully before maintenance of the
motor system.
Check the Hall cable sensor connector, Hall motor connector and controller connector for shorting
due to moisture, looseness or bad contact before maintenance of the motor system.
Attention should be paid to proper maintenance of the motor system and appropriate protection
measures for avoidance of the electric shock, since the high current and voltage are involved.
The Hall cable sensor and Hall motor sensor should be inspected for shorting before replacement of
the damaged controller with a new one, otherwise the new controller that has been installed will get
damaged again.
The motor temperature rises higher and faster in a high-altitude area than in a plain area. Thus the
scooter operating for a long time will easily result in the situation where the motor becomes
abnormally hot and even the motor fails.
Pay attention to the wire polarity in installing the battery or controller.
Technical Specification
Item Specifications
Motor
Motor type Brushless permanent-magnet motor
Control method FOC vector control
Rated voltage DC60V
Rated power 3000W
Maximum motor power 3500W
Controller
Rated voltage DC60V
Undervoltage protection 52±1V
Maximum input current of the controller 70A