What Causes the Buzzing Sound When a Newly Purchased New Energy Vehicle Starts?
2 Answers
Newly purchased new energy vehicles may produce abnormal sounds during startup, which is a normal phenomenon. The reasons are as follows: Slow Current Startup: When an electric vehicle starts, the input current to the drive motor is large. The motor needs to overcome resistance to reach the required speed, which naturally produces noise. This sound is caused by the friction between current torque and magnetic force and is normal. Electric Vehicle Noise: When carrying passengers, the startup current of an electric vehicle increases, making the noise more noticeable. This is normal and does not affect the vehicle's operation. However, it is advisable to accelerate slightly slower during startup to reduce the startup current. This will result in relatively less noise from the drive wheels and also benefit the battery's range.
When I first got my new energy vehicle, I was also startled by the buzzing sound. Later, after researching, I learned it's a normal phenomenon. When the electric motor starts, it needs to generate high torque, and the electromagnetic coils produce high-frequency vibration sounds, similar to our phone vibrations but louder. The cooling fan of the battery management system also spins noisily when starting. Another easily overlooked reason is the slight buzzing from the electronic vacuum pump when it assists the brakes. These sounds are particularly noticeable in garages or quiet areas, but you'll get used to them after driving for a while. However, if accompanied by metal grinding sounds or steering wheel vibrations, you should pay attention—it might be an issue with the half-shaft or bearings, in which case you should promptly schedule an after-sales inspection.
