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Electromagnetic noise intensifies with the increase of applied voltage and load. When the linear module motor starts, this noise significantly increases, but it immediately disappears when the module motor is idling. Mechanical vibration noise and ventilation noise, however, are unrelated to the applied voltage and load current, but are related to the speed. Electromagnetic noise caused by faults such as asymmetric stator three-phase windings or inter-turn short circuits can lead to imbalance in the three-phase current. Faults caused by cage rotor breakage or asymmetric three-phase windings of wound-rotor motors can lead to fluctuations in stator current and generate periodic vibrations.
Electromagnetic noise and mechanical vibration noise may appear intermittently, while ventilation noise remains relatively stable.
If the module motor produces noise primarily due to ventilation, the noise at its air inlet and outlet, as well as near the fan, will be louder than at other locations.