Electric ventilator with reduced shaft vibration by incorporating a magnetic plate inside the hub of the rotor to attract the metal plate covering the stator

摘要

An electric ventilator, e.g. rotary fan, has a magnetic plate (24) positioned inside the hub of the rotor (21) to attract the metal plate (222) positioned over the soil (222) of the stator (22). This reduces vibration of the rotor shaft inside the fixed bearings and prolongs the operating life of the ventilator. The magnetic plate can be recessed into the rotor hub or the rotor hub itself can be made of magnetic material.