Abstract: The present invention provides a disk drive device that can appropriately clamp a disk by means of magnetic force even when the disk drive device is very small. A clamping magnet 16 on which a disk 20 is mounted is attached to a turntable portion 15b of a rotor frame 15 to attract the disk 20. The clamping magnet 16 is configured so that the disk 20 can be mounted on the clamping magnet 16. An area of the rotor frame 15 from the turntable portion 15b to a boss portion 15a is composed of a ferromagnetic material.

Abstract: The rotor of this polygon mirror scanner motor is composed of a rotor magnet provided in the inner wall of a rotor frame, a rotor boss having a circular tube part and provided in the rotor frame, and a polygon mirror mounted on the rotor boss. The stator is composed of a stator core formed by laminating magnetic members and disposed oppositely to the rotor magnet, a stator coil wound in the stator core, and an iron plate circuit board having a through-hole. A dynamic pressure bearing is composed by forming a dynamic pressure groove in either one of the shaft fixed in the through-hole by laser welding, and the circular tube part of the rotor boss, and the circular tube part of the rotor boss is supported by the shaft.

Abstract: A brushless motor is provided which has excellent anti-impact properties and is easily assembled even if the brushless motor is reduced in size. A stator (2) includes a bearing (5) for holding a rotating shaft (3), a bearing housing (6) in which the bearing (5) is placed vertically relative to the stator base (1), a thrust plate (7) for receiving one end of the rotating shaft (3) in a thrust direction, a metal thrust cover (8) for holding the thrust plate (7), a metal installation member (25) including an annular section (25a) which is superposed over a base (6b) of the bearing housing (6) and projecting pin sections (25b) which project from the annular section (25a) to the outer periphery of the thrust cover (8). The projecting pin sections (25b) of the installation member (25) have projection sections welded to the thrust cover (8).

Abstract: There is provided a holding structure to hold a vibration motor on a circuit board with a sufficient holding strength using an inexpensive and simple means such as caulking and bonding and a vibration motor held on a circuit board using the holding structure. The holding structure having a holder clamps a vibration motor body having an eccentric weight at an end of the rotation shaft around the outer periphery from the outside and supports the vibration motor at the lower part.

Abstract: An axial fan is provided. The axial fan includes a hub, an impeller having a plurality of blades mounted on an outer peripheral surface of the hub, and a housing surrounding the impeller. Each of the blades has a front edge angle (?) within a range of ?8° to ?20°, a mounting angle (?) within a range of 36° to 50°, and a twisted angle (?) within a range of 10°±2°.

Abstract: In order to provide a vibration motor surface mounting structure capable of preventing a vibration motor from tipping over without using a part such as metal holder requiring complicated assembly, for a vibration motor having an eccentric weight mounted on the rotating shaft of the motor and mounted on a surface of a printed circuit board, a support member having extensions extending to the side of the rotating shaft on which the eccentric weight is mounted is used, a portion of this is fixed to the motor or the frame thereof, and a bottom surface including the extensions of the support member is secured to the mounting surface of the printed circuit board by soldering.

Abstract: A brushless motor to be used for driving a vane pump, which is employed in a module for inspecting vapor leakage of fuel, is disclosed. The brushless motor includes a mounting plate having a through hole, and an annular space is formed between an inner wall of the through hole and an outer wall of a projection of a motor housing. This annular space allows preventing a welding current from flowing into the projection.

Abstract: There is provided a holding structure to hold a vibration motor on a circuit board with a sufficient holding strength using an inexpensive and simple means such as caulking and bonding and a vibration motor held on a circuit board using the holding structure. The holding structure having a holder clamps a vibration motor body having an eccentric weight at an end of the rotation shaft around the outer periphery from the outside and supports the vibration motor at the lower part.

Abstract: A small DC motor includes a motor frame having a cylindrical portion, the cylindrical portion having a constant thickness and having a cross section in a shape that comprises four sides and connecting portions, each of the connecting portions connecting adjacent two of the four sides and being located inward from a corresponding corner in a quadrangle comprising the four sides; and a magnet having a circumferential surface on an inside thereof and having conformable contact with the motor frame on an outside thereof.

Abstract: A vibration motor includes a rotary shaft, an armature core secured to the rotary shaft and having a plurality of salient poles, an armature coil wound around each of the salient poles except at least one salient pole, a frame serving as an outside cover, a plurality of magnets secured to the frame and having respective different polarities, and a weight adapted to rotate together with the rotary shaft and disposed eccentrically, wherein the weight is disposed inside the frame and secured to the armature core in such a manner that at least a part of the weight is inserted in a hollow provided in at least the one salient pole having no armature coil.

Abstract: A closed-type motor has an elastic grommet with a through-hole into which a lead wire is inserted. The grommet covers an opening portion of a case. An elastic tube is connected to the grommet, and a cover covers the grommet. The grommet includes a pedestal portion abutted to the case; a tubular projection with the through-hole; and an annular groove surrounding a basal portion of the tubular projection. The tubular projection has an internal sectional area being equal to or larger than the one of the lead wire. The tube has an internal sectional area being equal to or larger than the one of the lead wire and has an inner diameter being equal to or less than an outer diameter of the tubular projection. The cover is provided with a central hole having a diameter being equal to or larger than an outer diameter of the tube.

Abstract: A motor assembly with coaxial shafts is provided which can be produced at low costs and in which a plurality of motors can be disposed with their respective rotary shafts arranged coaxially to one another with high coupling and assembling accuracy in a simple structure. Each motor includes a housing member and ball bearings to rotatably support the rotary shaft and two adjacent motors are fixedly coupled together such that the respective housing members of the adjacent motors are fitted with each other.

Abstract: A single phase stepping motor has a stator, and a rotor disposed to surround the stator. The stator includes first and second annular stator yokes, which are disposed opposite to each other and have a plurality of pole teeth formed along a circumference thereof, and an annular stator coil disposed between the first and second stator yokes. The rotor includes a ring magnet, which is disposed to surround the first and second stator yokes, and has a plurality of magnetic poles formed along a circumference of the rotor, and a shaft disposed at a center position of the magnet. At least a partial region of a gap formed between each of the pole teeth and the opposing magnetic pole of the magnet is non-uniform in a predetermined direction.

Abstract: A fan motor is provided. The fan motor includes a case having a cylindrical bearing housing, and a base unit fixing the cylindrical bearing housing; a pair of bearings fitted into the cylindrical bearing housing; a stator which has a wound coil and a bottom portion to which a PC board including a motor driving circuit and a lead wire for supplying the motor driving circuit with electrical current is fixed; a shaft supported by the pair of bearings; a rotor which faces the stator and is fixed to the shaft, and which has a magnet; and an impeller which is fixed to an outer peripheral portion of the rotor, and has plural blades. The stator, the PC board and the lead wire are molded by epoxy resin which has hardness of Shore D85 to D95 after curing and a glass transition temperature of 125° C. or higher.

Abstract: A method of selectively utilizing a set of linear actuator motors for an application includes providing a plurality of linear actuator motors numbered from 1 to N including a box shaped housing with respective lengths between a first end-plate and a second end-plate and respective hollow shafts. Each hollow shaft includes an extended portion out of either the first end-plate or the second end-plate and configured to receive a nut including a tube part integrally connected with a flat-end part. The nut is configured to be able to mate in a common manner to any of the plurality of linear actuator motors. The method further includes testing any of the plurality of linear actuator motors including the nut for the application, wherein the nut is detached from one linear actuator motor to reattach with another linear actuator motor.

Abstract: A method for controlling stopping of a vibration generating stepping motor is a method for controlling the stopping of an vibration generating stepping motor by a control unit, characterized in that the method includes: stopping a supply of a driving pulse to the vibration generating stepping motor while applying a driving voltage to the vibration generating stepping motor; applying the driving voltage to the stepping motor, which does not completely stop, for an optimum braking time according to a motor configuration of the stepping motor, so as to brake the stepping motor; and stopping the applying of the driving voltage to the stepping motor which is rotating under inertia after the elapse of the optimum braking time.

Abstract: A stepping motor has a stator and a rotor disposed to surround the stator. The rotor has an annular magnet which has a plurality of magnetic poles formed along a circumference thereof, and a comb-teeth-shaped back yoke which is disposed to surround the magnet and has a plurality of comb teeth, the comb teeth facing boundary positions of adjacent magnetic poles.

Abstract: A small DC motor includes: a motor frame including a cylindrical portion, the cylindrical portion having a constant thickness and having a cross section in a shape that includes four sides and connecting portions, each of the connecting portions connecting adjacent two of the four sides and being located inward from a corresponding corner in a quadrangle including the four sides; field magnets; and an armature assembly, wherein the field magnets are provided so as to be spaced apart from each other, and the small DC motor includes an air gap between each of the four sides and a radially outermost surface of the armature assembly, the air gap being a minimum size needed to rotate the armature assembly.