Abstract: An electronic device includes a casing, a centrifugal blower and sidewall received in the casing. The casing is adapted for accommodating electronic components therein, and includes a bottom cover and an opposite top cover. The centrifugal blower is surrounded by the sidewall and includes a sleeve directly mounted to the bottom cover, a bearing member mounted in the sleeve, a stator mounted to the sleeve and an impeller rotatably supported by the bearing member. The bottom cover of the electronic device functions as a bottom plate of the centrifugal blower.

Abstract: A motor control device includes a rotation speed control circuit, a voltage transforming circuit, a buffering circuit and a driving circuit. The rotation speed control circuit provides a rotation speed control signal. The voltage transforming circuit is electrically connected to the rotation speed control circuit and transforms the rotation speed control signal to a speed control voltage signal. The buffering circuit, electrically connected to the voltage transforming circuit, receives the speed control voltage signal and delays or buffers output of the speed control voltage signal. The driving circuit, electrically connected to the buffering circuit, receives the speed control voltage signal from the buffering circuit and generates a driving signal according to the speed control voltage signal so as to control the operation of the motor.

Abstract: A dynamic bearing manufacturing includes steps of: providing a bearing and a processing tool, the bearing having an axial hole, and the processing tool having at least one protruding pattern formed on an exterior wall of the processing tool; positioning the processing tool into the axial hole of the bearing; pressing the processing tool to contact with an inner wall of the bearing so as to transfer and print the protruding pattern of the processing tool onto the inner wall of the bearing; rotating the processing tool at a first rotation speed and driving the bearing to rotate at a second rotation speed; and forming at least one concave pattern on the inner wall of the bearing, and the at least one concave pattern being corresponding to the protruding pattern of the processing tool.

Abstract: An electronic device includes a casing, a centrifugal blower and sidewall received in the casing. The casing is adapted for accommodating electronic components therein, and includes a bottom cover and an opposite top cover. The centrifugal blower is surrounded by the sidewall and includes a sleeve directly mounted to the bottom cover, a bearing member mounted in the sleeve, a stator mounted to the sleeve and an impeller rotatably supported by the bearing member. The bottom cover of the electronic device functions as a bottom plate of the centrifugal blower.

Abstract: A cooling fan includes a fan housing and a stator and an impeller received in the fan housing. The fan housing includes a frame and a mounting portion located in the frame. The stator is received in the frame and mounted to the mounting portion. The impeller is mounted to the stator and rotatable with respect to the stator. The impeller includes a hub and a plurality of blades extending radially and outwardly from the hub. Each of the blades includes an inner end connected with the hub and an outer end distant from the hub. Each of the blades forms a tab on the outer end at the end surface.

Abstract: A sleeve bearing system includes a bearing housing, a sleeve bearing received in the bearing housing, and a wear-resistant pad received at a bottom of the bearing housing. The bearing housing defines a receiving recess therein for receiving the sleeve bearing. The wear-resistant pad is sandwiched between the sleeve bearing and a bottom of the bearing housing. The wear-resistant pad includes a central supporting portion aligning with the bearing hole of the sleeve bearing and a plurality of ears extending radially and outwardly from and an outer periphery of the supporting portion. A reservoir is defined between adjacent ears around the supporting portion.

Abstract: An exemplary sleeve bearing system includes a bearing housing, a sleeve bearing and a resilient washer. The bearing housing defines a receiving hole therein. The receiving hole has a first diameter. The sleeve bearing has a second diameter which is slightly less than the first diameter, and the sleeve bearing is received in the receiving hole of the bearing housing. The resilient washer is received in the receiving hole of the bearing housing and is fitted around the sleeve bearing. The resilient washer is sandwiched between the bearing housing and the sleeve bearing and resiliently abuts an outer circumferential surface of the sleeve bearing to thereby mount the sleeve bearing in the receiving hole of the bearing housing.

Abstract: A fan assembly includes a first fan and a second fan mounted on the first fan. The first fan includes a plurality of locking units and a plurality of positioning dots extending upwardly therefrom. Each of the locking units includes a perpendicular portion and a horizontal portion. The second fan defines a plurality of through holes therein corresponding to the locking units of the first fan, and a plurality blind holes therein corresponding to the positioning dots of the first fan. Each of the locking units of the first fan extends into a corresponding through hole of the second fan with the horizontal portion thereof engaging with the second fan near an edge of the through hole. Each of the positioning dots of the first fan is received in a corresponding blind hole of the second fan.

Abstract: A cooling fan includes a base forming a central tube at a central portion thereof, a stator mounted around the central tube and a rotor rotatable relative to the stator. The central tube defines at least one engaging slot therein. The stator includes a stator core, an upper insulating frame attached to a top side of the stator core and a lower insulating frame attached to a bottom side of the stator core. The upper insulating frame forms a plurality of protrusion tabs extending inwardly from an inner circumferential surface of the upper insulating frame. The protrusion tabs extend into and engage in the at least one engaging slot to securely mount the stator core around the central tube.

Abstract: A bearing structure which is cooperated with a shaft and is disposed in a bearing tube comprises an oil bearing and a cylindrical sealing member. The oil bearing has an axial hole. The shaft passes through the axial hole. The cylindrical sealing member covers a top surface and at least a portion of a sidewall of the oil bearing. The cylindrical sealing member has a through hole defined in its center. The shaft passes through the through hole.

Abstract: A fan includes a motor and an impeller. The motor drives the impeller to rotate and includes a base, a bearing, a stator, a rotor and a magnetic element. The central portion of the base is extended to form a bushing for accommodating the bearing therein. The stator telescopes around the bushing. The rotor is disposed corresponding to the stator and has a shaft passing through the bearing. The magnetic element is disposed at the bottom of the bushing and located adjacent to one end of the shaft.

Abstract: A fan structure includes a frame, a cover, a stator structure and a base. The cover and the frame are integrally formed as a single piece. The stator structure is disposed in the cover and the base is connected to the cover. Thus, the stator structure is located between the cover and the base.

Abstract: An oil sealing structure of a motor includes a cover and at least one sealing element. The motor has a shaft, a fluid bearing and a bushing. The fluid bearing mounts to the shaft and is accommodated in the bushing. The cover is disposed around the shaft and is connected with an opening of the bushing. The sealing element is disposed around the shaft and between the fluid bearing and the cover. A fan and a motor including the above-mentioned oil sealing structure are also disclosed.

Abstract: A motor control device includes a rotation speed control circuits a voltage transforming circuit, a buffering circuit and a driving circuit. The rotation speed control circuit provides a rotation speed control signal. The voltage transforming circuit is electrically connected to the rotation speed control circuit and transforms the rotation speed control signal to a speed control voltage signal. The buffering circuit, electrically connected to the voltage transforming circuit, receives the speed control voltage signal and delays or buffers output of the speed control voltage signal. The driving circuit, electrically connected to the buffering circuit, receives the speed control voltage signal from the buffering circuit and generates a driving signal according to the speed control voltage signal so as to control the operation of the motor.

Abstract: A method for utilizing a household's existing telephone line wiring and existing analog telephone sets to make VoIP calls and PSTN calls is provided. The method allows the installation of a simple VoIP routing device in the existing wiring without restructuring of the existing wiring or a deployment of a totally separate network. The method deploys a number of mapping devices to take advantages of the un-used wires in the existing wiring. The mapping devices are installed between the wall jacks and the phone sets, and between a wall jack and the VoIP routing device. The installation of the mapping devices is easy and requires no special tools and experienced personnel.

Abstract: A stator structure of a motor includes a magnetically conducting element, a circuit board, a bus line and a housing. The magnetically conducting element has at least one coil. The circuit board is positioned adjacent to the magnetically conducting element and electrically connected to the coil. The bus line is electrically connected to the circuit board or the coil. The housing has a top part and a bottom part, which are disposed at two opposite sides of the magnetically conducting element. The top part or the bottom part has a first fastening structure. One end of the circuit board or the bus line is fixed to the first fastening structure.

Abstract: A fan includes a motor and an impeller. The motor drives the impeller to rotate and includes a base, a bearing, a stator, a rotor and a magnetic element. The central portion of the base is extended to form a bushing for accommodating the bearing therein. The stator telescopes around the bushing. The rotor is disposed corresponding to the stator and has a shaft passing through the bearing. The magnetic element is disposed at the bottom of the bushing and located adjacent to one end of the shaft.

Abstract: A bearing structure which is cooperated with a shaft and is disposed in a bearing tube comprises an oil bearing and a cylindrical sealing member. The oil bearing has an axial hole. The shaft passes through the axial hole. The cylindrical sealing member covers a top surface and at least a portion of a sidewall of the oil bearing. The cylindrical sealing member has a through hole defined in its center. The shaft passes through the through hole.

Abstract: A dynamic bearing manufacturing includes steps of: providing a bearing and a processing tool, the bearing having an axial hole, and the processing tool having at least one protruding pattern formed on an exterior wall of the processing tool; positioning the processing tool into the axial hole of the bearing; pressing the processing tool to contact with an inner wall of the bearing so as to transfer and print the protruding pattern of the processing tool onto the inner wall of the bearing; rotating the processing tool at a first rotation speed and driving the bearing to rotate at a second rotation speed; and forming at least one concave pattern on the inner wall of the bearing, and the at least one concave pattern being corresponding to the protruding pattern of the processing tool.

Abstract: A fan structure includes a frame, a cover, a stator structure and a base. The cover and the frame are integrally formed as a single piece. The stator structure is disposed in the cover and the base is connected to the cover. Thus, the stator structure is located between the cover and the base.