(i) Weight of rotor is entirely loaded on to the shaft. Abrasive rotation between shaft and bearing will result in an irregular and rough surface on the inner surface of bearing bore. The fan motor rotation becomes uneven and in turn causes operational noise and shortens fan life. (ii) The oil ring and mylar washer not only result in added friction area but also block the high temperature gases, which if not released before solidification, would become nitride particles that, in turn, clog in the gap between shaft and bearing bore then causing a much slower rotation of rotor and noise.
(i) The entire weight of rotor is completely attracted by magnetic force in any mounted position, keeping the motor rotating evenly at a fixed point and keeping a consistent distance from inner surface of the bearing. No more traditional rubs and noise occur. (ii) Oil ring, washer, and lubricant are no longer used in maglev structure. Hence there is no more oil leakage or stuck rotor problems. (iii) Maglev design allows an operating temperature higher than 70°C.
Ball bearing
(i) When the fan motor is operating, the steel balls inside will generate a higher rotational noise than that of a sleeve bearing. (ii) The construction of ball bearings is quite weak and unable to absorb external impact. It is easily damaged and results in louder rotational noise.
