Abstract: Disclosed is a starting device and method for eliminating a peak current introduced when an inductive circuit such as a motor or a direct-current (DC) motor is actuated, The starting device includes a signal generator electrically connected to the inductive circuit and generating a first signal corresponding to a signal output by the inductive circuit, a comparative circuit electrically connected to the signal generator for converting the first signal to a second signal to be compared with a reference signal to generate a control signal, and a controlling device electrically connected with the inductive circuit and the comparative circuit for receiving the control signal and gradually increasing a current input into the inductive circuit corresponding to the control signal, thereby eliminating the peak current introduced when the inductive circuit is actuated.

Abstract: A driving level control structure eliminating electric noise from motor includes a drive control unit, a sensing unit, a setting unit, a first comparing unit, and a frequency control unit. The first comparing unit generates a first discriminating signal based on a reference level signal provided by the sensing unit and a preset level signal provided by the setting unit. The frequency control unit generates a second discriminating signal based on the first discriminating signal. The second discriminating signal is set to a specific frequency fallen out of a human ear perceptible frequency range before being sent to the drive control unit for controlling a motor coil unit to on or off as a current limiting operation, so that electric noise from a motor during the current limiting operation thereof is eliminated.

Abstract: A fan frame device includes a plastic frame member and a metal reinforcing member. The inner side of the frame defines a flow path for receiving a fan wheel. The metal reinforcing member is joined to the frame member integrally. The inner side of the frame is arranged to have a largest diameter so that the flow passage provides more space for accommodating a larger sized fan wheel. Hence, strength of the frame is reinforced, vibration and noise are reduced during a fan wheel running and integral effect of heat dissipation is enhanced largely.

Abstract: A fan frame structure includes a plastic frame and a metal reinforcing member. The inner side of the frame defines a flow passage for receiving a fan wheel. The metal reinforcing member is joined to the frame intimately. The inner side of the frame is arranged to have a largest diameter so that the flow passage provides more space for accommodating a larger sized fan wheel. Hence, strength of the frame is reinforced, vibration and noise are reduced during a fan wheel running and integral effect of heat dissipation is enhanced largely.

Abstract: A fan with an arranging device for cable thereof includes a frame member, a fan blade part and a cable. The frame member provides a driving part and a middle section and the middle section has a groove. The fan blade part is composed of a fan hub and fan blades surrounding the fan hub. The fan hub is rotationally joined to the driving part. The cable is attached to the driving part with an end thereof providing a connector. The cable can be received in the groove and located at the groove fast.

Abstract: Disclosed is a stator structure of a rotary device and its forming method.

Abstract: A centrifugal fan type cooling module includes a centrifugal fan and a radiator. The centrifugal fan provides a fan rotor with fan blades and an axial shaft and a fan stator set with an axial core, an upper cover and a frame. The fan blades extend straight forward radially with the outer end of each fan blade has an enlarged curve end part and the rest part of the respective fan blade has a width shorter than the axial shaft. The frame encloses and fits with the top of the radiator and the axial shaft is rotationally joined to the axial core such that a hollow space is formed between the radiator and the fan rotor. Heat from an electronic component is transmited to the radiator and removed outward quickly in all directions by way of upward suction force of the centrifugal fan instead of contacting other electronic members directly.

Abstract: An axial flow fan comprises a fan frame and a fan blade wheel. The fan flame has an inlet and an outlet with a support device at the outlet. The fan blade wheel is received in the fan frame. The support device at least has a guide flow device to guide flowing fluid during the fan blade wheel rotating. In this way, a stagnation area can be resisted at the fan and enhances effect of heat dissipation.

Abstract: A control circuitry, electrically connected to a DC motor and a variable voltage source for modulating a rotational speed of the DC motor. The control circuitry includes a voltage reference component and a switching circuit. The voltage reference component is electrically connected with the variable voltage source and provides a predetermined reference voltage. The switching circuit is electrically connected with the DC motor and the voltage reference component. The switching circuit is “OFF” when a voltage given by the variable voltage source is lower than the predetermined reference voltage so that the DC motor operates with a first operation mode, and the switching circuit is “ON” when the voltage given by the variable voltage source is higher than the predetermined reference voltage so that the DC motor operates with a second operation mode.

Abstract: A centrifugal fan type cooling module includes a centrifugal fan and a radiator. The centrifugal fan provides a fan rotor with fan blades and an axial shaft and a fan stator set with an axial core, an upper cover and a frame. The radiator provides cooling fins and is mounted to the centrifugal fan with the frame. Heat generated by an electronic component and radiated by the radiator can be removed outward quickly in all directions by way of upward suction force of the centrifugal fan and the L shaped fan blades of the centrifugal fan to avoid air flow carrying heat contacting other electronic members directly for enhancing effect of the cooling module.

Abstract: A motor driving system includes a power supply unit, a voltage-stabilizing unit, a signal-generating unit, a comparing unit, and a control unit. The power supply unit provides an input supply voltage to each other unit in the system. The voltage-stabilizing unit includes a voltage-stabilizing element and produces a constant voltage. The signal-generating unit generates an input signal, which varies with high and low levels of the input supply voltage. The comparing unit compares the constant voltage with the input signal to generate a comparison signal. The control unit controls a motor's rotating speed according to the comparison signal generated by the comparing unit. When the input supply voltage is low, a lowest rotating speed is set for the control unit to control the rotating of the motor.

Abstract: An air fan mainly includes a frame and a blade portion. The blade portion is formed from a hub and a plurality of blades spaced around the hub; and the frame includes a plurality of locating members, and a driving section fixedly supported at inner ends of the locating members to locate at a center of the frame for the hub to rotatably connect thereto. The inner ends of the locating members are upward bent to axially extend into the frame by a predetermined height, and the hub is axially shortened by a length corresponding to the predetermined height of the bent inner ends of the locating members, so that a lower surface of the driving section is vertically spaced from a bottom surface of the frame, enabling airflows produced by the blade portion to move to a space below the lower surface of the driving section.

Abstract: A motor driving system includes a power supply unit, a voltage-stabilizing unit, a signal-generating unit, a comparing unit, and a control unit. The power supply unit provides an input supply voltage to each other unit in the system. The voltage-stabilizing unit includes a voltage-stabilizing element and produces a constant voltage. The signal-generating unit generates an input signal, which varies with high and low levels of the input supply voltage. The comparing unit compares the constant voltage with the input signal to generate a comparison signal. The control unit controls a motor's rotating speed according to the comparison signal generated by the comparing unit. When the input supply voltage is low, a lowest rotating speed is set for the control unit to control the rotating of the motor.

Abstract: A cooling fan device for mounting on top of parallel radiation fins of a radiator. The device includes a seat having a driving section, and an air-guiding fan pivotally connected to the driving section of the seat and including a hub and blades generally radially spaced around an outer periphery of the hub. Supporting sections are extended from two opposite sides of the driving section in directions parallel with the radiation fins of the radiator to support the driving section in the seat. With the supporting section in parallel with the radiation fins, flowing air produced by the air-guiding fan is allowed to flow toward the radiator without hindrance.

Abstract: A cooling fan includes a radiator having a plurality of radiation fins, and a fan connected to a top of the radiator. The fan includes a frame and a plurality of blades mounted in the frame at an inclined position relative to the top of the radiator. Therefore, airflows produced by the blades of the fan are directly continuously blown toward side surfaces of the radiation fins of the radiator to accelerate the dissipation of heat transferred from an operating electronic element to the radiation fins.

Abstract: An air fan mainly includes a frame and a blade portion. The blade portion is formed from a hub and a plurality of blades spaced around the hub; and the frame includes a plurality of locating members, and a driving section fixedly supported at inner ends of the locating members to locate at a center of the frame for the hub to rotatably connect thereto. The inner ends of the locating members are upward bent to axially extend into the frame by a predetermined height, and the hub is axially shortened by a length corresponding to the predetermined height of the bent inner ends of the locating members, so that a lower surface of the driving section is vertically spaced from a bottom surface of the frame, enabling airflows produced by the blade portion to move to a space below the lower surface of the driving section.

Abstract: A cooling fan device for mounting on top of parallel radiation fins of a radiator. The device includes a seat having a driving section, and an air-guiding fan pivotally connected to the driving section of the seat and including a hub and blades generally radially spaced around an outer periphery of the hub. Supporting sections are extended from two opposite sides of the driving section in directions parallel with the radiation fins of the radiator to support the driving section in the seat. With the supporting section in parallel with the radiation fins, flowing air produced by the air-guiding fan is allowed to flow toward the radiator without hindrance.

Abstract: Disclosed is a stator structure of a rotary device and its forming method. The method for forming a stator structure includes the steps of (a) forming a first part having a first middle portion with a through hole, and M pieces of extending portions extending from the first middle portion, (b) forming a second part having a second middle portion with a through hole, and N pieces of extending portions extending from the second middle portion, (c) alternately bending the M pieces of extending portions of the first part toward a first direction and alternately bending the N pieces of extending portions of the second part toward a second direction opposite to the first direction, respectively, and (d) correspondingly combining the first and second parts together to form the stator structure in which the bent extending portions of the first and second parts constitute a columnar portion of the stator structure for winding a coil thereon, wherein M and N are even numbers not less than four, respectively.

Abstract: A control circuitry, electrically connected to a DC motor and a variable voltage source for modulating a rotational speed of the DC motor. The control circuitry includes a voltage reference component and a switching circuit. The voltage reference component is electrically connected with the variable voltage source and provides a predetermined reference voltage. The switching circuit is electrically connected with the DC motor and the voltage reference component. The switching circuit is “OFF” when a voltage given by the variable voltage source is lower than the predetermined reference voltage so that the DC motor operates with a first operation mode, and the switching circuit is “ON” when the voltage given by the variable voltage source is higher than the predetermined reference voltage so that the DC motor operates with a second operation mode.

Abstract: A micro-motor with low cogging torque. The micro-motor includes a stator, a rotor, first and second magnetically conductive assemblies, and a bobbin. The first and second magnetically conductive assemblies are respectively comprised of a plurality of magnetically conductive sheets stacked together. The magnetically conductive sheets are each formed with a plurality of asymmetrical salient teeth. Furthermore, at least one of the magnetically conductive sheets is disposed reversely relative to the other magnetically conductive sheets. The rotor is coupled to the stator.