Abstract: A cooling fan includes a fan housing (30) having a central tube (34) extending upwardly therefrom, a bearing (60) being received in the central tube, a stator (20) being mounted around the central tube, and a rotor (10) having a shaft (18) extending through the bearing. At least one notch (180, 184) is defined in an end of the shaft. A balance structure (62) is mounted around the shaft, and has a portion facing and surrounding an upper portion of the at least one notch of the shaft. The balance structure is made of magnetic material, which can attract the shaft downward to thereby counter the upward force generated by the rotor when it is driven to rotate. Accordingly, the noise problem incurred by the floating of the rotating rotor can be resolved by the present invention.

Abstract: A cooling fan includes a fan housing (10) having a shaft seat (16) extending downwardly therefrom, a stator (20) being fixedly mounted around the shaft seat, a shaft (80) with a top end being fixedly connected to the shaft seat and a free end (82) extending downwardly therefrom, a rotor (30) comprising a hub (32) having a plurality of blades (34) extending radially and outwardly, and a sleeve bearing (40). A fixing tube (36) extends upwardly from a center of the hub. The fixing tube has a closed bottom end and defines a fixing hole (360) therein. The sleeve bearing is fixedly received in the fixing hole of the fixing tube to rotate with the rotor. A bearing hole is defined in the sleeve bearing for extension of the free end of the shaft therethrough.

Abstract: A fan frame includes a housing (10), a supporting base (20) and a plurality of ribs (30) connecting the housing with the supporting base. One of the ribs includes a bottom wall (33), and first and second lateral walls (31, 32) extending from two opposite sides of the bottom wall, respectively. A receiving groove (35) is defined between the bottom wall and the lateral walls. A securing tab (40) extends from an outer end of the first lateral wall towards the second lateral wall. A securing finger (42) extends aslant from a free end of the tab towards the second lateral wall. A slot (50) is defined between the finger and the second lateral wall with a width thereof gradually decreased inwardly. The tab, the finger, the bottom wall and the first lateral wall cooperatively define a gap (45) therebetween for extension of power wires (60) of the fan.

Abstract: A fan rotor includes a hub (10), a plurality of blades (20) radially disposed around the hub, and a magnet (30) located in an inner side of the hub. The hub includes a top wall (12) and a sidewall (14) surrounding the top wall. A plurality of spaced first ribs (17) is disposed between the top wall of the hub and a top wall of the magnet. A plurality of spaces (171) is formed between adjacent first ribs for accommodating equilibrium clay (50) therein.

Abstract: A cooling fan includes a fan housing (30) having a central tube (34) extending upwardly therefrom; the central tube has a bottom, annular protrusion (31). A bearing (61) is received in the central tube and mounted on the protrusion. A stator (20) is mounted around the central tube. A rotor (10) includes a shaft (18) having a free end (186) extending through the bearing and defining a notch (184) therein. A locking washer (63) engages into the notch of the shaft to limit movement of the shaft along an axial direction thereof. A balance structure (62) is arranged between the locking washer and the bearing. The balance structure is made of magnet and exerts a downwardly pulling force on the shaft to prevent the rotor from moving upwardly when the rotor is rotated.

Abstract: A cooling fan includes a fan housing (10) having a central tube (11) extending upwardly therefrom, a bearing (20) received in the central tube, a stator (40) mounted around the central tube, a rotor (30) having a shaft (37) extending into the bearing, and a magnetic ring (38) being fixedly mounted to the rotor to rotate with the rotor during operation of the cooling fan. The bearing is made of iron-copper alloy. The magnetic ring is made of hard magnetic material and exerts a magnetic attraction on the bearing, whereby the rotor is pulled downwardly by a magnetic attraction of the bearing on the magnetic ring to lessen the floating problem of the rotor during operation of the cooling fan.

Abstract: A fan motor includes a frame (10) and a motor (30). The frame includes a supporting plate (13) and a central tube (16). A pair of arms (181) extends upwardly from the supporting plate and spaces from each other to form a gap (184) therebetween. Each arm has a barb (182) at a top end thereof. The motor includes a circuit board (31) and a stator (33). The stator defines an axial hole (338) for receiving the central tube therein. The circuit board defines a fixing hole (312) therein corresponding to the pair of arms. The pair of arms extend through the fixing hole with the barbs of the pair of arms abutting on the circuit board. A pin (191) is inserted into the gap between the pair of the arms.

Abstract: A heat dissipating fan includes a housing (201), a stator (21), a rotor (27) and a buffer structure. The housing defines an accommodating space (202) and includes a hollow tube (201b). The tube encloses first and second bearings (22, 23) therein. The stator is arranged in the accommodating space and around the tube. The rotor has a shaft rotatably disposed in the first and the second bearings. The buffer structure includes at least a pair of magnets (25, 26) received in the tube and located between the first and second bearings. Repellent force is generated between the magnets, thereby preventing at least one of the first and the second bearing from being damaged by an accidental force acting thereon.

Abstract: A fan motor includes a frame (10) and a motor (30). The frame includes a supporting plate (13) and a central tube (16). A pair of arms (181) extends upwardly from the supporting plate and spaces from each other to form a gap (184) therebetween. Each arm has a barb (182) at a top end thereof. The motor includes a circuit board (31) and a stator (33). The stator defines an axial hole (338) for receiving the central tube therein. The circuit board defines a fixing hole (312) therein corresponding to the pair of arms. The pair of arms extend through the fixing hole with the barbs of the pair of arms abutting on the circuit board. A pin (191) is inserted into the gap between the pair of the arms.

Abstract: A fan frame includes a housing (10), a supporting base (20) and a plurality of ribs (30) connecting the housing with the supporting base. One of the ribs includes a bottom wall (33), and first and second lateral walls (31, 32) extending from two opposite sides of the bottom wall, respectively. A receiving groove (35) is defined between the bottom wall and the lateral walls. A securing tab (40) extends from an outer end of the first lateral wall towards the second lateral wall. A securing finger (42) extends aslant from a free end of the tab towards the second lateral wall. A slot (50) is defined between the finger and the second lateral wall with a width thereof gradually decreased inwardly. The tab, the finger, the bottom wall and the first lateral wall cooperatively define a gap (45) therebetween for extension of power wires (60) of the fan.

Abstract: A cooling fan includes a fan housing (10) having a shaft seat (16) extending downwardly therefrom, a stator (20) being fixedly mounted around the shaft seat, a shaft (80) with a top end being fixedly connected to the shaft seat and a free end (82) extending downwardly therefrom, a rotor (30) comprising a hub (32) having a plurality of blades (34) extending radially and outwardly, and a sleeve bearing (40). A fixing tube (36) extends upwardly from a center of the hub. The fixing tube has a closed bottom end and defines a fixing hole (360) therein. The sleeve bearing is fixedly received in the fixing hole of the fixing tube to rotate with the rotor. A bearing hole is defined in the sleeve bearing for extension of the free end of the shaft therethrough.

Abstract: A heat dissipating fan includes a housing (201), a stator (21), a rotor (27) and a buffer structure. The housing defines an accommodating space (202) and includes a hollow tube (201b). The tube encloses first and second bearings (22, 23) therein. The stator is arranged in the accommodating space and around the tube. The rotor has a shaft rotatably disposed in the first and the second bearings. The buffer structure includes at least a pair of magnets (25, 26) received in the tube and located between the first and second bearings. Repellent force is generated between the magnets, thereby preventing at least one of the first and the second bearing from being damaged by an accidental force acting thereon.

Abstract: A cooling fan includes a fan housing (30) having a central tube (34) extending upwardly therefrom, a bearing (60) being received in the central tube, a stator (20) being mounted around the central tube, and a rotor (10) having a shaft (18) extending through the bearing. At least one notch (180, 184) is defined in an end of the shaft. A balance structure (62) is mounted around the shaft, and has a portion facing and surrounding an upper portion of the at least one notch of the shaft. The balance structure is made of magnetic material, which can attract the shaft downward to thereby counter the upward force generated by the rotor when it is driven to rotate. Accordingly, the noise problem incurred by the floating of the rotating rotor can be resolved by the present invention.

Abstract: A cooling fan includes a fan housing (10) having a central tube (11) extending upwardly therefrom, a bearing (20) received in the central tube, a stator (40) mounted around the central tube, a rotor (30) having a shaft (37) extending into the bearing, and a magnetic ring (38) being fixedly mounted to the rotor to rotate with the rotor during operation of the cooling fan. The bearing is made of iron-copper alloy. The magnetic ring is made of hard magnetic material and exerts a magnetic attraction on the bearing, whereby the rotor is pulled downwardly by a magnetic attraction of the bearing on the magnetic ring to lessen the floating problem of the rotor during operation of the cooling fan.

Abstract: A fan rotor includes a hub (10), a plurality of blades (20) radially disposed around the hub, and a magnet (30) located in an inner side of the hub. The hub includes a top wall (12) and a sidewall (14) surrounding the top wall. A plurality of spaced first ribs (17) is disposed between the top wall of the hub and a top wall of the magnet. A plurality of spaces (171) is formed between adjacent first ribs for accommodating equilibrium clay (50) therein.

Abstract: A cooling fan includes a fan housing (10) having a central tube (14) extending upwardly therefrom, a bearing (30) received in the central tube, a stator (40) mounted around the central tube, and a rotor (20). The rotor includes a hub (22), a magnet (28) adhered to the hub, and a shaft (24) extending from the hub into the bearing. The stator includes a stator core (42) having a ring-shaped main body (420) and a plurality of claws extending radially and outwardly from the main body, coils (44) being wound on the claws, and a PCB (426) being electrically connected to the coils. At least one balancing structure (100) made of magnetizable material extends from the printed circuit board corresponding to a position between two adjacent claws of the stator core and exerts a downwardly attractive, magnetic force on the magnet.

Abstract: A cooling fan includes a fan housing (30) having a central tube (34) extending upwardly therefrom; the central tube has a bottom, annular protrusion (31). A bearing (61) is received in the central tube and mounted on the protrusion. A stator (20) is mounted around the central tube. A rotor (10) includes a shaft (18) having a free end (186) extending through the bearing and defining a notch (184) therein. A locking washer (63) engages into the notch of the shaft to limit movement of the shaft along an axial direction thereof. A balance structure (62) is arranged between the locking washer and the bearing. The balance structure is made of magnet and exerts a downwardly pulling force on the shaft to prevent the rotor from moving upwardly when the rotor is rotated.

Abstract: A cooling fan includes a fan housing (10) having an upper tube (111) extending downwardly from a top side thereof and a lower tube (121) extending upwardly from a bottom side thereof, a ball bearing (20) being mounted in the upper tube, a sleeve bearing (30) being mounted in the lower tube, a stator (45) mounted around the lower tube, and a rotor (40). The rotor includes a hub (401) located between the ball bearing and the sleeve bearing and a shaft (50) extending through the hub. Two ends of the shaft are rotatably received in the ball bearing and the sleeve bearing, respectively.

Abstract: A cooling fan includes a fan housing (30) having a central tube (34) extending upwardly therefrom, a bearing (61) received in the central tube and defining a bearing hole (62) therein, a stator (20) mounted around the central tube, and a rotor (10) including a hub (12) having a shaft (18) extending from the hub into the bearing hole of the bearing. The stator includes a stator core, and upper and lower insulating frames (28a, 28b) respectively located at upper and lower sides of the stator core. An oil retaining structure (288) is integrally formed with the upper insulating frame, and extends inwardly from a top of the upper insulating frame to an outer surface of the shaft.