Principle of mobile phone vibration: An eccentric motor is an ordinary motor with a cam installed on the head, and the center of gravity of the cam is not on the rotating shaft of the motor. When rotating, the cam makes a circular motion, generating centrifugal force. Since the direction of the centrifugal force rotates with the cam The constant changes and continuous viewing will cause the phone to swing in a larger left and right direction. In fact, it vibrates in the up and down direction. However, due to excessive resistance, the vibration in this direction is not very obvious, so the phone is held in the hand. The phone feels like it's vibrating.
In addition, combined with the circuit of the mobile phone, when a message is received and When it is necessary to be reminded by vibration, the control circuit of the mobile phone will send out a signal, so that an appropriate amount of current will be input to the motor. The rotation of the motor rotor drives the cam to rotate, thus generating vibration. If you are interested, you can take a small motor and put something irregularly shaped on its rotating shaft, and it will jump when it rotates.
For large-scale high-speed and high-speed running machine tools, the calibration axis must be very precise, otherwise the operation will not be smooth. The most common one is a magnetic disc cutting machine. If the magnetic disc breaks, the cutting machine will shake violently. Furthermore, if the wheels of a bicycle are deformed, you can feel the regular shaking of the body as the wheels rotate by holding the body with your hands when turning rapidly