Abstract: A coil structure for a coreless motor includes a plurality of first conductive traces and a plurality of second conductive traces. The first conductive traces are disposed in succession relative to one another, and are each arranged into a planar spiral configuration having a substantially polygonal shape. At least one adjacent pair of the first conductive traces cooperate to define a space therebetween. Each of the second conductive traces is disposed in the space defined by a corresponding adjacent pair of the first conductive traces, and is arranged into a planar spiral configuration that has one of a substantially triangular shape and a substantially rhombic shape so as to substantially fill the space.

Abstract: A manufacturing method for a stator structure and a micromotor having the same. The method includes: providing a flexible printed circuit (FPC) on which configuration positions of coil windings and a configuration position of at least one position signal generating unit are formed, wherein the FPC is further provided with an interface part; disposing the coil windings and the position signal generating unit on the coil winding configuration positions and the position signal generating unit configuration position, respectively, wherein the interface part is further provided with a connector pattern which is electrically coupled with the coil windings and the position signal generating unit; forming a FPC assembly including the coil windings and the position signal generating unit; and winding the FPC assembly to form the stator. The stator is applied in a micromotor in which a rotor, the stator and a case are disposed outward in a radial direction.

Abstract: A back EMF measuring method for multi-phase BLDC motor is proposed, which includes a driving process and a measuring process. The driving process energizes a plurality of phase windings of a detected motor by driving signals generated by a computing unit to rotate a rotor of the detected motor to a predetermined speed. The measuring process selects one of the phase windings as a target phase winding, continuously sends the driving signals to the phase windings other than the target phase winding but stops the driving signal sent to the target phase winding by the computing unit, and measures the back EMF of the target phase winding by a signal sensing unit.

Abstract: A coil structure for a coreless motor includes a plurality of first conductive traces and a plurality of second conductive traces. The first conductive traces are disposed in succession relative to one another, and are each arranged into a planar spiral configuration having a substantially polygonal shape. At least one adjacent pair of the first conductive traces cooperate to define a space therebetween. Each of the second conductive traces is disposed in the space defined by a corresponding adjacent pair of the first conductive traces, and is arranged into a planar spiral configuration that has one of a substantially triangular shape and a substantially rhombic shape so as to substantially fill the space.

Abstract: A stator structure, a micromotor having the same, and a micromotor manufacturing method therefor are provided. In the micromotor configured with the stator, a rotor, the stator and a case are disposed outward in a radial direction. The rotor is pivotly connected in the case and the stator includes a FPC assembly which is configured with a plurality of coil windings and at least one position signal generating unit and is circumferentially disposed between the rotor and the case, with the rotor as the axis. Configuration positions of the coil windings and the position signal generating unit are corresponding to magnetic poles of the rotor.

Abstract: A concentrically aligned planetary gear assembly and a power transmission device are provided. The planetary gear assembly includes a ring gear, having a bottom cover and a top cover; a graded transmission module; a power input module, having a power shaft and a power input gear; and a power output module, having a planet wheel set and an output shaft. The graded transmission module includes a planetary arm and plural planetary gears. The planetary arm has a transmission tray and a coaxial sun gear, in which the transmission tray has plural planetary pivoting structures, and an outer diameter of the transmission tray is coaxial with an addendum circle of the internal gear, so as to be slidingly fitted to each other. The plurality of planetary gears is engaged with the internal gear, pivoted on the planetary pivoting structures, and freely rotates with respect to the planetary pivoting structures.

Abstract: A fan motor structure is provided. A fan is disposed within an accommodating hole at a center of a body. A permanent magnet and a printed circuit board (PCB) provided with plural coils are respectively disposed between an upper ring and a base of the body. An axial air gap is formed between the coils and the permanent magnet. A bearing is disposed between the upper ring and the base. The fan blades of the fan extend from the periphery of the accommodating hole toward the center of the fan. An axle center of the fan overlaps with that of the body. The coils after being supplied with a current create a flux linkage with the permanent magnet. Due to the flux linkage and the axial air gap between the coils and the permanent magnet, the upper ring is forced to rotate, thus driving the fan to rotate.

Abstract: An integrated motor, integrated to a structural part and an electronic substrate of an electronic device, includes a base formed on the structural part of the electronic device, a rotor having a load, and a stator having a plurality of winding coils and a driving circuit respectively shaped on the electronic substrate of the electronic device, for driving the rotor to rotate in a specific direction.

Abstract: A power transmission device is provided. The power transmission device includes a motor, an intermediate gearset, and a planetary gearset assembly. The motor includes a motor output shaft. The intermediate gearset has an input gear connected to the motor output shaft. The motor drives an intermediate gear output shaft of an output gear of the intermediate gearset. The planetary gearset assembly has an input end connected to the intermediate gear output shaft. The intermediate gear output shaft drives a planetary gear output shaft of an output end of the planetary gearset assembly.

Abstract: The present invention relates to a slotless winding for a rotating electric machine and a manufacturing method thereof. The slotless winding includes at least one flexible printed circuit board having at least one circuit, and one piece of flexible printed circuit board(s) is curved or a plurality of pieces of flexible printed circuit board(s) is mutually combined to form a barrel shape, thereby simplifying the procedure of manufacturing the slotless winding, improving production speed and reliability, and enabling diversified designing schemes to meet the demands of the rotating electric machine. In addition, it is not necessary for the coil winding to be cured for assembling, and assembling yield is thus enhanced.