5.2 SME three-phase AC motor
The power system of four-wheel electric forklift truck is composed of three-phase AC
drive motor and three-phase AC lifting motor. It’s with function of speed sensor,
temperature sensor, simple construction, reliable performance, free of maintenance.
(Fig.5-3)
Fig.5-3 Structure of AC motor
1. Front cover 2. Bearing 3. Temperature sensor
4. Support cap 5. Stator 6. Rotor
7. Rear cover 8. Gear sensor 9. Speed sensor
5.2.1 Operating environment
Operate normally under the following conditions:
(1) Elevation is lower than 1200 meters.
(2) Air temperature ranges between -25℃ and +40℃.
(3) Relative humidity is 100%.
5.2.2 Daily inspection and maintenance
(1) Always keep clean and no water, oil pollution or dust in the motor.
(2) Check the bearing for heat or leakage.
(3) The load current of the motor can’t be over rated current.
(4) If there is friction, scream or other noise, stop working at once, after removing the
failure, the motor will keep on working.
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