Abstract: A fan wheel assembly includes at least three hub rings and a connecting member. Each outer circumference of the hub rings provides with extension fan blades. The connecting member serially connects the hub rings which are coaxially stacked in a longitudinal direction to constitute the fan wheel assembly. Each extension fan blade of one of the hub rings extends into two adjacent extension fan blades of the other two of the hub rings that each leading edge of one layer of the extension fan blades overlaps the other two layers of the extension fan blades along a longitudinal direction. Thereby, the overlapped extension fan blades can increase total blade-surface area of the fan wheel assembly.

Abstract: A pressure-boosting axial-flow heat-dissipating fan includes a housing and an impeller. The housing includes an annular wall including an air inlet in a first end thereof and an air outlet in a second end thereof. A base and a pressure-boosting device are mounted in the air outlet. The impeller is rotatably mounted to the base. The impeller includes a hub and a plurality of blades on an outer periphery of the hub. Two of the blades adjacent to each other partially overlap with each other along an axis parallel to a rotating axis of the impeller. The number of the blades on the impeller is increased such that the overall air-driving area of the blades is increased, improving the overall heat-dissipating efficiency.

Abstract: A heat-dissipating module includes a first fan unit and a second fan unit, which are serially connected together to provide an air inlet and an air outlet. Each of the first fan unit and the second fan unit includes a casing and an impeller. At least one side air inlet is defined in at least one of a plurality of sides of the casing of the first fan unit and a plurality of sides of the casing of the second fan unit. The air inlet amount and the air outlet amount of the second fan unit are increased by the side air inlet. The air density distribution is uniform, and the wind noise during operation is lowered.

Abstract: An airflow guiding structure for the heat dissipation fan includes a housing, a base and a plurality of guiding members. The housing is formed with an air outlet at which the base and the guiding members are provided. The base is used to support a fan wheel and supported by the guiding members. The guiding members are arranged in at least two guiding directions at the air outlet and at least one of the guiding members is inclined to an axis of the housing. When the fan wheel rotates, the guiding members guide airflow to the two guiding directions.

Abstract: An axial tube assembly for a motor includes an axial tube and a sleeve mounted in the axial tube. The axial tube is securely mounted to a casing, and a stator is mounted to the axial tube. The axial tube includes at least one engaging member on an inner periphery thereof. The sleeve includes at least one engaging member engaged with the engaging member of the axial tube. When a bearing is mounted in the sleeve, the sleeve is tightly engaged with the axial tube such that the axial tube and the bearing exert forces to each other to thereby retain the axial tube and the bearing in place.

Abstract: A disc carrier assembly for an optical disc drive includes a disc carrier having an axial tube, a clamping device, and a positioning sleeve. The clamping device includes a central hole and plural clamping members for clamping an optical disc. The axial tube of the disc carrier is extended through the central hole of the clamping device. The positioning sleeve is securely sandwiched between an inner periphery delimiting the central hole of the clamping device and the axial tube. The positioning sleeve includes a flange for engaging with the clamping device to prevent the clamping device from disengaging from the disc carrier.

Abstract: A prestressing structure for rotationally balancing a motor includes a motor stator, a motor rotor, a magnetically conductive member and a balancing magnet. The motor stator has an axial hole and an axial tube extending therethrough. An end of the axial tube provides with the magnetically conductive member. The motor rotor has an inner surface and a shaft seat mounted thereon. A top portion of the shaft seat provides with the balancing magnet which has at least one surface successively attracting at least one surface of the magnetically conductive member for stabilizing rotary movement of the motor.

Abstract: An axial-flow type fan includes a fan housing consisting of an air-boosting inlet, an air outlet and an air channel, and a fan wheel consisting of a hub and fan blades arranged about a rotary axis of the hub. Each of the fan blades has a tipped leading corner to constitute an air inlet blade structure which forms a topmost portion in a longitudinal direction and a forefront portion in a rotational direction. The tipped leading corners are situated in the air-boosting inlet of the fan housing while the air channel accommodates the fan wheel. When the fan wheel is rotated, the tipped leading corners of the fan blades are able to eliminate air turbulence and air noise in the air-boosting inlet of the fan housing.

Abstract: A motor includes an axial tube mounted in a stator, a rotor, a balancing magnet, and a magnetically conductive member. The rotor includes an axial base formed on an inner face thereof and a shaft extending from the axial base through a bearing received in the axial tube. The balancing magnet is mounted to the upper end of the axial tube. The magnetically conductive member is mounted to a bottom end of the shaft base of the rotor. At least one face of the balancing magnet faces and attracts at least one face of the magnetically conductive member to maintain rotational balance and starting balance of the rotor. The magnetically conductive member may be replaced with a magnetically conductive portion integrally formed with the shaft.

Abstract: A lubricating oil guiding system for a motor includes an axial tube, a first bearing mounted in the axial tube, a second bearing mounted in the axial tube, at least one separating plate securely mounted to the inner periphery of the axial tube, and at least one auxiliary oil chamber defined between the first bearing, the separating plate, and the shaft for distributing lubricating oil to the first bearing and for storing, buffering, and guiding the lubricating oil. A shaft of a rotor extends through the first bearing, the second bearing, and the separating plate. The first bearing defines an oil circulating loop and the second bearing defines an oil circulating loop. The separating plate is located between the first bearing and the second bearing to avoid mutual interference between the oil circulating loop of the first bearing and the oil circulating loop of the second bearing.

Abstract: An axial-flow type fan includes a fan housing consisting of an air inlet, an air outlet and an air channel, and a fan wheel consisting of a hub and fan blades. The air channel of the fan housing accommodates the fan wheel which has end-cornered cutting blades proximate the air outlet of the fan housing. When the fan wheel is rotated, the end-cornered cutting blades are able to eliminate air turbulence and air noise in the air outlet of the fan housing.

Abstract: A disc carrier for an optical disc drive includes a recession integrally formed thereon and an axial tube projecting from a central portion of a bottom wall of the recession. A shaft extends through the axial tube. An engaging length between the axial tube and the shaft is increased to improve rotating stability of the disc carrier. A support member is fixed in the recession and includes a peripheral support edge along a periphery thereof. The support member is in contact with and thus supports plural clamping members of a clamping device.

Abstract: A disc carrier assembly for a spindle motor for an optical disc drive includes a rotor and a disc carrier. The rotor includes an end wall and a peripheral wall. The end wall has a central hole. The disc carrier includes a main plate having an inner side and an outer side. The inner side of the main plate is in intimate contact with the end wall of the rotor. The main plate includes an engaging portion on the inner side thereof. The engaging portion includes an axial hole through which a shaft is securely extended, allowing joint rotation of the disc carrier and the shaft. The engaging portion further includes an annular groove for securely receiving a peripheral wall portion delimiting the central hole of the end wall of the rotor, allowing joint rotation of the disc carrier and the rotor.

Abstract: A heat-dissipating fan includes a casing having an air outlet, a base mounted in the air outlet, and a plurality of guiding plates in the air outlet. An impeller is mounted on the base that is supported in the air outlet by the guiding plates. The guiding plates are parallel to one another and extend in a direction having an inclining angle with respect to an axial direction of the air outlet. The guiding plates guide airflow and increase wind pressure when the impeller turns.

Abstract: A heat-dissipating fan includes a casing having an air outlet, a base mounted in the air outlet, an impeller being mounted on the base and having a plurality of blades, a plurality of ribs each extending between the base and the casing along a radial direction of the base, and at least two air-guiding ring fixedly mounted to the ribs. The air-guiding rings vary in inclinations along a longitudinal direction of the casing. The air-guiding ring guides airflow in various directions, and divides airflow passing through the air outlet when the impeller is turning.

Abstract: A prestressing structure for rotationally balancing a motor includes a motor stator, a motor rotor, a magnetically conductive member and a balancing magnet. The motor stator has an axial hole and an axial tube extending therethrough. An end of the axial tube provides with the magnetically conductive member. The motor rotor has an inner surface and a shaft seat mounted thereon. A top portion of the shaft seat provides with the balancing magnet which has at least one surface successively attracting at least one surface of the magnetically conductive member for stabilizing rotary movement of the motor.

Abstract: A thermally suppressing circuit includes a restart-charging drive member, a coil set, a restart-charging capacitor, and a charging switch set. The restart-charging drive member is electrically connected to the coil set and the restart-charging capacitor while the charging switch set is connected between the coil set and the restart-charging capacitor. The charging switch set is used to access signals output from the restart-charging drive member. In abnormal operation, as the restart-charging drive member may turn on an auto-restart function to output a high or low voltage signal, the charging switch set is turned on to accelerate charging the restart-charging capacitor to thereby avoid overcurrent passing the coil set.

Abstract: A combination structure of a motor has a base board, a printed circuit board and at least one sensing unit. The base board is used for placing a stator and a rotor and has at least one first assembly hole. The printed circuit board is connected to the base board and has at least one second assembly hole. The sensing unit is used for sensing a magnet of the rotor. The second assembly hole of the printed circuit board is placed corresponding to the first assembly hole of the base board for commonly containing the sensing unit so that an axial height of the motor is decreased.

Abstract: A thermally suppressing circuit mainly comprises a restart-discharging drive member, a coil set, a restart-discharging capacitor, and a discharging switch set. The restart-discharging drive member is electrically connected to the coil set and the restart-discharging capacitor while the discharging switch set connected between the coil set and the restart-discharging capacitor. The discharging switch set is used to access signals output from the restart-discharging drive member. In abnormal operation, as the restart-discharging drive member may turn on an auto-restart function to output a high or low voltage signal, the discharging switch set is turned on to accelerate discharging the restart-discharging capacitor to thereby avoid overcurrent passing the coil set.

Abstract: A heat-dissipating fan includes a casing having an air outlet, a base mounted in the air outlet, an impeller being mounted on the base and having a plurality of blades, a plurality of ribs each extending between the base and the casing along a radial direction of the base, and at least one guiding ring fixedly mounted to the ribs. The guiding ring has an axial length that is longer than a width of the guiding ring in the radial direction. The guiding ring guides and divides airflow passing through the air outlet when the impeller is turning.