Why Do Electric Vehicles Make Noise?

[McRuby]

Electric vehicles make noise because pure electric vehicles are required to emit such warning sounds when driving at low speeds. The reasons for the noise are: The vast majority of pure electric vehicles produce a peculiar "humming" sound when driving at very low speeds. This sound is completely inaudible inside the car and can only be heard outside, specifically near the front of the vehicle. Moreover, as soon as the speed increases, this sound immediately disappears. The source of the sound: In fact, this sound is not from the motor but is artificially generated. The sound does not originate from the motor but is emitted by a specialized speaker. This sound is called the low-speed warning tone. Currently, the low-speed warning tone is a national standard in the pure electric vehicle industry, and almost all pure electric vehicles must emit such a warning sound when driving at low speeds.