Abstract: A sensorless and brushless motor is disclosed including a stator, a rotor, a control circuit and an induction coil (50). The stator includes a stator core (30) and a stator coil (34) wound around the stator core. The rotor includes a rotor magnet (40). The control circuit is electrically connected with the stator coil for controlling a current energizing the stator coil. The induction coil is mounted to the stator and electrically connected with the control circuit. When the rotor rotates, the induction coil is capable of outputting a signal to the control circuit and in response to the signal, the control circuit is capable of changing a direction of the current flowing in the stator coil. Thus, the commutation control for the stator coil is performed by the induction coil and the conventional Hall sensor is eliminated.

Abstract: A hydrodynamic bearing assembly comprises a bearing (10) defining a bearing hole (12) therein, a shaft (20) rotatably received in the bearing hole with a bearing clearance formed between a bearing surface of the bearing and an outer surface of the shaft, and a cover (40) attached to a top end of the bearing. The bearing clearance is filled with lubricant. A locking groove (22) is formed in an outer periphery of the shaft. The cover defines a through hole (42) receiving the shaft at the locking groove. Interlocking devices are formed on the cover and the bearing to join the cover and the bearing.

Abstract: A fan motor includes an integral bearing member (40?) defining therein an axial inner bearing hole (21?) and forming a ventilating path (25?) in a wall portion thereof to communicate a bottom of the bearing hole with an exterior of the bearing member, a stator assembly (50) mounted to an outer periphery of the bearing member, and a rotor assembly (60) comprising a rotary shaft (68) extending into the bearing hole and a permanent magnet (66) confronting the stator assembly. Lubricating oil is filled between the rotary shaft and bearing member to establish dynamic pressure to separate the rotary shaft and the bearing member in radial direction when the rotary shaft rotates.

Abstract: A manufacturing tool (20) for forming a dynamic pressure groove (52) in an inner peripheral surface of a bearing sleeve (50) includes a tool shaft (21) for being rotated in a bore of the bearing sleeve while being moved in an axial direction thereof. Protrusions (25) are integrally and circumferentially arranged on an outer periphery of the tool shaft near a leading end (22) thereof. Machining tips (26) are integrally formed on outmost ends of the protrusions for machining the inner peripheral surface of the bearing sleeve to form the dynamic pressure groove therein.

Abstract: A motor includes a support member (40) having a bearing housing (20) defining a bearing hole (21) therein, a stator assembly (50) mounted to an outer periphery of the support member, and a rotor assembly (60) having a rotary shaft (68) extending into the bearing hole and a permanent magnet (66) confronting the stator assembly. A bearing pattern (100) is formed on either of the bearing housing and the rotary shaft. The bearing pattern includes a number of first and second grooves (13, 16) arranged circumferentially in an alternate fashion. Each of the first grooves is in communication with one adjacent second groove at an edge of the bearing pattern. Lubricating oil filled in the bearing pattern to establish dynamic pressure to separate the shaft and the bearing sleeve in radial direction when the shaft rotates.

Abstract: A fluid dynamic bearing unit includes a bearing housing (20) axially defining therein a bearing hole (21), a rotary shaft rotatably received in the bearing hole with a radial space formed between the rotary shaft and the bearing housing, and lubricant filled in the radial space. A ventilating path (25) is formed in a wall of the bearing housing to communicate a bottom of the bearing hole with an exterior of the bearing housing.

Abstract: A fluid dynamic bearing includes a bearing member (30) axially defining an inner bearing hole therein, and a spindle shaft (20) rotatably received in the bearing hole with a bearing clearance formed between an inner periphery of the bearing member and an outer periphery of the spindle shaft. Lubricant is filled in the bearing clearance. One of the inner periphery and the outer periphery comprises a bearing surface (10) with channels formed therein. The channels form a plurality of outer communication ends (1316b) at opposite sides of the bearing surface in the axial direction of the bearing member.

Abstract: A fluid bearing module has a bearing seat, a bearing, a deflecting member, and an impediment. The bearing seat has a capacity with an opening. The bearing in the capacity has a hollow space for the axis of a rotor to go through, and a lubricant medium is filled in between. The deflecting member protruding from the side near the opening of the bearing seat bends toward the capacity and clips on the rotor axis. The impediment protrudes from the side near the opening of the bearing seat for preventing the deflecting member from bending toward the opening and departing from the rotor. Moreover, the deflecting member and the impediment form a maze to keep the lubricant medium within.

Abstract: A composite fluid dynamic bearing and its manufacturing method is disclosed. By machining a plurality of bearings independently, the grooves of each bearing have uniform slopes. Then the method of the invention combines the bearings, which have different slope of the grooves, to form a bearing module having pressure-generating grooves. In this way the precision of the machining grooves of bearings can be improved.

Abstract: A fluid dynamic bearing module for cooling fans connects the fixed part and the rotating part of a cooling fan and provides lubrication and support when the rotating part rotates relative to the fixed part. In the design of the invention the fluid dynamic bearing is a module that utilizes a bearing seat, a wear-resistant element and an anti-lift element to make the bearing module leak-proof, lift-proof, wear-resistant and able to create a balance of the lubricant and air.

Abstract: A composite fluid dynamic bearing and its manufacturing method is disclosed. By machining a plurality of bearings independently, the grooves of each bearing have uniform slopes. Then the method of the invention combines the bearings, which have different slope of the grooves, to form a bearing module having pressure-generating grooves. In this way the precision of the machining grooves of bearings can be improved.

Abstract: A novel gas control module switch mechanism includes a diaphragm means, a valve body, a piston means and a fastening means. The diaphragm means has a plurality of diaphragms and a seal plate sandwiched between a first and a second diaphragm. The first diaphragm has a center opening to prevent the first diaphragm from making direct sealing contact. Sealing is done through the seal plate. The seal plate is made of a soft material for obtaining improved sealing effect and longer durability. The valve body has a bulged ring around an opening plane and a bulged body ring for enhancing sealing effect when the seal plate making contact with the bulged ring.

Abstract: A heat sink for CPU comprises a heat-conduction base and a plurality of heat dissipation fin sets, wherein the plurality of heat-dissipation fin sets made from webs are aligned; top edges of two lateral walls of the heat-conduction base are higher than that of the fin sets to form a fan-installation space, and a plurality of snap-joint openings are formed in those two lateral walls for joining a cooling fan; and, the fin sets are upright and closely joined face-to-face on the heat-conduction base by welding.

Abstract: A clipping device for a cap needle or the like is disclosed. The device comprises a main body and a pushing block, wherein a cylindrical insertion hole is formed at one end of the main body and a rectangular slot is formed adjacent to and overlapping with the edge of the insertion hole. The pushing block is slidably mounted within the slot, which comprises a lower section and an upper section and is formed integrally as a block body. One end of the lower section is a clipping section, which is used to clip and hold the syringe cap. The pushing block is pushed away with a finger, and a syringe cap can be clipped and held by means of the clipping section when the syringe cap is within the insertion hole.