Industrial Vibration motors rely on their own high-frequency vibration to generate the vibration force. Therefore, during the operation process, the motor itself will rise to a high temperature. Because of the existence of the fit clearance, the axle of the vibration motor after the temperature rise will expand. After the expansion, the axle and the bearing should have close cooperation with each other to achieve the normal operating status. Without the fit clearance, the vibration motor after the operating temperature reaches certain level will be faced with a series of problems, which might even stop operation or be burned. Hence, this problem requires more attention in vibration motor maintenance.