Yadea electric car will ring salad when you add a throttle.

Brushless motor used in electric vehicle is a kind of low-speed, high-torque, wheel-centered external rotor DC brushless three-phase motor, so when the motor commutates at low speed, it will produce a little tiny oscillation and produce a vibration source. For example, when the vibration frequency is close to the frequency of the frame and the molecular composite plastic shell, * * vibration will occur and sound will be formed.