Abstract: An axial magnetic flux electrical machine having a rotor attached to a shaft, the rotor comprising magnets and pole shoes; and a stator, the stator has a separate pole cores having corresponding separate coils, and the number of poles cores is larger than the number of pole shoes.

Abstract: In the axial gap rotating electrical machine, the rotor includes a rotor yoke that is formed by wrapping amorphous ribbon wound toroidal core, which is obtained by winding an amorphous magnetic metal ribbon into a toroidal core. Magnets having plural poles are circumferentially disposed on a stator-facing surface of the amorphous ribbon wound toroidal core.

Abstract: An axial gap rotating machine rigidly fixing permanent magnets without reducing magnetic flux and having a high output has: a housing; a rotating shaft rotatably supported in the housing; two rotors having disks rotatably integral with the rotating shaft, and permanent magnets arranged concentrically in spaced relation to each other on at least one side of surfaces of the rotating disks in spaced relation to each other on at least one side of surfaces of the rotating disks in spaced relation to each other; and a stator arranged between the rotors, spaced from the rotors and fixed to the housing, the stator having a plurality of coils disposed concentrically around the rotating shaft spaced from each other; wherein magnetic flux generated from the permanent magnets of the rotors intermittently penetrates the interior of each of the coils as the shaft rotates, wherein the rotating disk has a concave portion in the surface facing the stator in which the permanent magnets are disposed so as to protrude.

Abstract: A technique of employing a rotor having anti-saliency and being rotatable about a predetermined axis in an axial gap type motor is provided. A plurality of magnets are disposed annularly on a substrate with polarities being symmetric around a shaft hole. For instance, the magnets exhibit N pole and S pole, respectively, on the side of a stator (on this side of sheet of drawing). A plurality of magnetic members are disposed to extend perpendicularly to the direction of a rotation axis, and more specifically, between the magnets.

Abstract: A fan assembly includes a stator and a rotor. The stator is located in a fan frame and includes a base, at least one magnetizing winding provided on the base at a first relative position relative to a center of the base, and at least one magnetic conductive element provided on the base at a second relative position relative to the center of the base. The rotor is fixedly mounted in a fan hub, and has at least one positive pole and at least one negative pole, which are alternately arranged to constitute a magnetic induction face. The fan hub is rotatably connected to the fan frame via a shaft with the magnetic induction face facing toward the magnetizing winding and the magnetic conductive element on the base. With the above arrangements, the fan can have a largely reduced axial height for use in a limited space.

Abstract: A three-phase motor includes a bearing structure, a rotor structure and a stator structure. The bearing structure has a bushing. The rotor structure has a shaft disposed in the bushing. The stator structure is disposed corresponding to the rotor structure and includes a first coil assembly and a second coil assembly overlapped on the first coil assembly. A fan with the motor is also disclosed. The present invention can increase the ratio of the effective coils of the stator structure, and further promote the operation efficiency of the three-phase motor and the fan with the three-phase motor.

Abstract: An axial gap coreless motor includes a stator including a stator yoke having a surface and being composed of a plurality of laminated layers of silicon steel sheets secured together, a wiring substrate having a surface and being disposed on the stator yoke surface, and a plurality of coreless coils annularly disposed on the wiring substrate surface; and a rotor including a rotor magnet having a plurality of circumferentially arranged magnetic poles, wherein the rotor is rotated relative to the stator such that the rotor magnet axially confronts the coreless coil over an air gap.

Abstract: An axial gap-type permanent magnetic rotating machine comprises a rotor comprising a rotating shaft having an axis of rotation, a rotor yoke of disc shape radially extending from the shaft, and a plurality of permanent magnet segments circumferentially arranged on a surface of the rotor yoke such that each permanent magnet segment may have a magnetization direction parallel to the axis of rotation, and a stator having a plurality of circumferentially arranged coils and disposed to define an axial gap with the rotor. In the rotor, each permanent magnet segment is an assembly of two or more divided permanent magnet pieces, and the coercive force near the surface of the magnet piece is higher than that in the interior of the magnet piece.

Abstract: A brushless electric machine includes a rotor and a stator. Each of the twin poles of the stator electromagnetic members corresponds to one of the two magnetic poles of the rotor magnetic assembles. Two radial component air-gaps are arranged between the stator and the rotor to separate the stator and the rotor. Axial component air-gaps axially corresponding are arranged between the stator poles and the corresponding rotor poles to separate the stator poles and the rotor poles. The stator wheel-shaped ring is partly surrounded by the rotor wheel-shaped ring.

Abstract: The present invention relates to an axial motor, and more specifically, to an axial motor which has a simple structure and is easily assembled by inserting and holding core teeth in core teeth insertion holes circularly arranged on a yoke. The axial motor according to the present invention includes: a stator having core teeth which are insulated by insulators, arranged in a ring-shaped pattern, and have a coil wound thereon; and a rotor having magnets which are arranged in a ring-shaped pattern to face the ends of the core teeth in an axial direction and are supported by the rotor axis at the center of the rotor to rotate relatively with respect to the stator.

Abstract: A brushless DC motor includes a base, a stator, a rotor, and a leak flux absorber. The base couples with the rotor. The stator has a coil module and is mounted on the base. The rotor has a shaft and a permanent magnet, with the rotor coupling with the base through the shaft. A gap is axially formed between the permanent magnet and the coil module. Also, the leak flux absorber is disposed around the coil module and is adjacent to, partially in, or totally in the gap. Consequently, a leak flux generated by the permanent magnet, which does not pass through the coil module, is absorbed by the leak flux absorber and forms close magnetic flux paths, so that high-frequency noise in operation is thus lowered.

Abstract: A two-phase electric motor includes first and second coil groups and a magnet group. In the magnet group, N poles and S poles are disposed alternatively opposite the first and second coil groups. The first and second coil groups are disposed at positions that are out of phase with each other by an odd multiple of ?/2 in electrical angles. The coils of the first and second coil groups have substantially no magnetic material cores, and the electric motor has substantially no magnetic material yoke for forming a magnetic circuit.

Abstract: A miniature motor includes a base having a layout layer with two faces spaced along an axis. The layout layer includes a coil unit. The base further includes an outer layer provided on one of the faces of the layout layer. A shaft seat is provided on the base. A rotor includes a shaft and a permanent magnet. The shaft is coupled to the shaft seat and rotatable about the axis. The permanent magnet is aligned with the coil unit. An air gap is formed between the permanent magnet and the outer layer of the base. The coil unit is integrated into the base such that the coil unit is outside of the air gap. The axial height of the miniature motor is reduced, and the structure of the miniature motor is simplified.

Abstract: Embodiments of actuators (20) comprise an electromagnetically conductive housing (22); a rotor (24); a first stationary pole member (48); a second stationary pole member (42); a first permanent magnet (44) connected to the first pole member (48); a second permanent magnet (46) connected to the first pole member (48); and; an electrically conductive coil (40) situated within the housing (22) and configured to define a cavity. The rotor (24) comprises a rotor shaft (26) and a rotor flange (28). The rotor flange (28) comprises both a first flange segment (56) and a second flange segment (58) which extend in different radial directions relative to the rotor shaft (26).

Abstract: An axial gap electric dynamo machine has a horizontally disposed rotor disk that is stabilized at its periphery by a plurality of permanent magnets connected to a ferromagnetic bearing plate that provides an opposing or repulsive force against the rotor magnets. In some preferred embodiments, the bearing plate magnets are configured in a dual band to further enhance the magnetic field that supports the periphery of the spinning rotor.

Abstract: A generator device for generating electrical energy includes a rotor having a first set of even-numbered of magnetic sources distributed along a first radius of the rotor, and a first pair of stators, each having a first set of odd-numbered coil members distributed along a first radius of the stator, the stators disposed adjacent to opposing side portions of the rotor, wherein each coil member includes a core portion having an amorphous structure. In addition, a generator device for generating electrical energy includes interchangeable rotor and stator pairs to provide variable voltage/current/frequency outputs.

Abstract: A magnetic force rotation device includes a rotor and a stator. The rotor is provided with a plurality of magnetic assemblies containing permanent magnet. The plurality of magnetic assemblies are arranged along the circumferential direction of the rotating shaft to form a wheel-shaped ring, and each magnetic assembly is provided with two magnetic poles. The stator is provided with a plurality of magnetically isolated electromagnets coaxially arranged. The electromagnets form a wheel-shaped ring around the rotating shaft, and each electromagnet is provided with paired poles. The wheel-shaped ring of the stator is at least party surrounded by the wheel-shaped ring of the rotor, so that each pole of the paired poles of the electromagnets of the stator corresponds to one magnetic pole of the two magnetic poles of the magnetic assemblies of the rotor respectively. Two axial component air gaps are provided between the rotor and the stator.

Abstract: An axial gap rotary electric machine includes a rotor, an armature and a stator. The rotor is capable of rotating in a circumferential direction about a rotation axis. The rotor includes permanent magnets and magnetic plates which cover those from the armature side. The armature includes an armature coil opposed to the rotor from one side in a rotation axis direction parallel to the rotation axis. The stator is opposed to the rotor from the other side in the rotation axis direction.

Abstract: A power generating turbine includes a rotary shaft having an axis of rotation, a magnet supported by and spaced outwardly from the rotary shaft and a conductive coil. The coil is located outwardly from the magnet and surrounds the magnet and the shaft, but is sufficiently close to the magnet such that rotary movement of said magnet induces current flow in the coil.

Abstract: An axial gap rotary electric machine includes a rotor, an armature and a stator. The rotor is a magnetic body, which is capable of rotating in a circumferential direction about a rotation axis. The armature includes an armature coil opposed to the rotor from one side in a rotation axis direction parallel to the rotation axis. The stator causes the armature coil to interlink with a magnetic field flux from the other side in the rotation axis direction via the rotor.

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: The present invention is directed to a vibration generating device used for mobile telephone, etc., which comprises a rotor (110), and a stator (120) for rotatably supporting the rotor, and serving to rotate the rotor to thereby generate vibration. The rotor comprises a bearing sleeve (160) consisting of resin molded material and rotatably attached to a fixed shaft (124) provided at the stator, a magnet (170) and a weight (180) positioned in eccentric state with respect to the bearing sleeve, wherein the bearing sleeve and the magnet are formed in the state where they are integrated by material resin of the bearing sleeve.

Abstract: A permanent-magnet rotating electrical machine includes a stator with an armature coil and a rotor arranged to rotate with a predetermined air gap with respect to the stator. The rotor includes a rotor core. Permanent magnets are arranged inside the rotor core on an outer circumferential side, or at the surface of the rotor core. The permanent magnets each are divided into a plurality of segments in an axial direction along a dividing face. The dividing face and an end face of the permanent magnet facing a circumferential direction form acute angles to define narrowed areas to suppress generation of eddy currents in the permanent magnets, prevent deterioration of the permanent magnets, and improve efficiency of the permanent-magnet rotating electrical machine.

Abstract: An axial gap EDM deploys as a stator coils a series of two parallel serpentine windings that each circumscribe an arc segment of a circle. Each arc segment that forms the stator winding assembly is powered as a separate phase. The two winding are readily formed by shaping one or more wire segment. Preferably the parallel winding are arranged to overlap with a half period rotational offset such that the radial directed serpentine segments of that are disposed above and below the stator disk are interlaced when viewed in projection through the disk. In one embodiment, each series of serpentine winding are separated by a gap so that they can be inserted on the stator disk from the edge. A separate rotor disk is adjacent each side of this stator disk. In another embodiment, each series of serpentine winding are separated by a gap, so they can be inserted to surround a single rotor disk which has two series of magnets disposed on opposite sides.

Abstract: A motor including an outside rotor having a rotor disc with plural magnets alternating polarities flush mounted in the disc, an inside stator assembly with a ring of pole pieces forming a channel to house a transversely wound stator windings, and a controller coupled with feedback electronics for monitoring a timing, speed and direction and coupling a signal to a processing unit for adjusting the drive electronics driving the phase windings. A u-shaped gap above the channel to receive the rotor disc and focus the captured magnetic flux in the pole pieces toward the magnets. In an embodiment the molded magnetic flux channel pole pieces of the inside stator are sets of molded magnetic flux channel pole pieces, each set forming a channel and corresponding to one phase of the motor; and a section of each one of the transverse windings passing through one channel, the remaining section folding back outside the set in close proximity to the outer base of the set of molded magnetic flux channel pole pieces.

Abstract: An axial air-gap electronic motor is arranged such that a teeth surface of a stator and a magnet surface of a rotor are arranged opposedly with a predetermined gap therebetween along an axis line direction of an output shaft of the rotor. The rotor has a rotor back yoke arranged coaxially with the stator, and a rotor magnet installed to the rotor back yoke so as to face the teeth surface of the stator. The rotor magnet is provided with an anchor magnet which is integral with the rotor magnet and is arranged on a back surface side of the rotor back yoke.

Abstract: A brushless DC motor includes a base, a stator, a rotor, and a leak flux absorber. The base is for the rotor to couple. The stator has a coil module and is mounted on the base. The rotor has a shaft and a permanent magnet, with the rotor coupling with the base through the shaft and a gap is axially formed between the permanent magnet and the coil module. And the leak flux absorber is disposed around the coil module and is adjacent to, partially in, or totally in the gap. Consequently, a leak flux generated by the permanent magnet, which does not pass through the coil module, is absorbed by the leak flux absorber and forms close magnetic flux paths, so that the high-frequency noise in operation is thus lowered.

Abstract: An eccentric rotor equipped with a fan is included in an axial gap micro-fan motor for generating vibrations and cooling. The rotor has a first impeller section having a low specific gravity and a second impeller section having a high specific gravity. Each fan comprises a flat section at an upper surface of an axial gap magnet and an impeller section at a side of the magnet. The fans are assembled by concave-convex mating sections at the flat sections and are also bonded to and held by the axial gap magnet. Impeller blades of the fans are optionally formed as backward vanes.

Abstract: An electromagnetic moving system comprises a stator, a moving body and a controller. The stator comprises a circuit board with two layers of electrically connected coil windings spaced apart in a series way and made as spirals with center and peripheral points. The spirals of one layer are shifted in respect to the spirals of the adjacent layer along the line connecting the center points thus the center points of the spirals of one layer in transparent view are located between two nearest spirals of the adjacent layer. Each of the spirals of one layer in transparent view at least partially overlaps two nearest spirals of the adjacent layer. The moving body is comprised of one permanent magnet such as to cause interaction with the stator when it is powered, thus creating a force tending to propel the moving body along the line connecting said center points.

Abstract: In a fan motor, there are provided protruding portions provided integrally with a base member so as to face a magnet and protrude toward the magnet, and openings facing the magnet, in the base member made of magnetic material. As to the positional relation between the protruding portions and the openings, when the protruding portions are positioned corresponding to centers of the magnetic poles, the openings are positioned corresponding to boundaries between the magnetic poles. As to the positional relation between the protruding portions and the coils, when the protruding portions are positioned corresponding to centers of the magnetic poles, both ends of the coils are positioned corresponding to positions other than the boundaries between the magnetic poles.

Abstract: An electrical machine is provided. The machine includes at least one rotor mounted for rotation about a central axis and at least two stator sections mounted axially adjacent to and on opposite sides of the rotor. The rotor includes two circumferentially arrayed rows of alternating segments of permanent magnet and ferromagnetic pole pieces. One of the rows is spaced radially inwardly from the other row. The permanent magnet and ferromagnetic pole pieces are separated by a non-ferromagnetic material. The pole pieces are arranged so that the permanent magnet segments in the first row are radially adjacent to ferromagnetic segments in the second row so that the N-S magnetic fields of the permanent magnet segments are aligned axially. Each stator section includes a ferromagnetic stator frame, at least a first AC winding wound in circumferential slots in the stator frame, and a DC field winding wound on the stator frame.

Abstract: It is an object of the present invention to provide techniques for improving efficiency and torque of a motor while achieving thinning of the motor. In a brushless DC motor, a rotor includes a magnetic-field creating magnet and a stator includes an armature winding. The magnetic-field creating magnet and the armature winding are placed to locally face in a radial direction orthogonal to an axial direction. This reduces a thickness of the brushless DC motor which extends in the axial direction. Also, a short-circuit yoke plate for joining and magnetically short-circuiting the north pole and the south pole of a permanent magnet is placed on a negative side in the axial direction with respect to the magnetic-field creating magnet. By provision of the short-circuit yoke plate, a magnetic path on a negative side in the axial direction with respect to the magnetic-field creating magnet can be shortened.

Abstract: A permanent magnet (PM) electric generator with directly controllable field excitation control comprises: a drive shaft; a PM rotor assembly with multiple PMs arranged around an outer axial periphery of the rotor assembly; a stator assembly comprising a ferromagnetic stator yoke, multiple ferromagnetic stator teeth mounted to the stator yoke with distal ends proximate the outer axial periphery of the rotor assembly separated by an air gap and multiple stator coils mounted between the stator teeth; multiple saturable ferromagnetic shunts, each shunt coupling adjacent distal ends of the stator teeth to shunt air gap magnetic flux ?g generated by the PMs across the air gap through the distal ends of the stator teeth; and multiple saturation control coils, each saturation control coil wrapped about a saturable region of an associated one of the shunts; wherein application of a control current Ic to the control coils at least partially magnetically saturates the shunts to reduce shunting of air gap magnetic flux ?

Abstract: The present invention achieves an improvement in the power generation capacity of a general purpose engine provided for a power generation application while realizing reductions in the weight and size thereof. An optional external apparatus can be attached to one shaft part of a rotary shaft, and an axial gap type motor/generator constituted by power generating rotors (inner and outer rotors) and a stator is attached integrally to another shaft part of the rotary shaft.

Abstract: A general purpose engine is provided with an engine main body, a rotary shaft, and an axial gap type motor/generator. The rotary shaft is rotated by a driving force of the engine main body. The rotary shaft includes a first shaft part disposed on one side portion of the engine main body and a second shaft part disposed on another side portion of the engine main body. The axial gap type motor/generator is attached integrally to the second shaft part. The axial gap type motor/generator is provided with a power generating rotor that rotates integrally with said rotary shaft, and a stator that is attached to the engine main body. The stator is disposed on a side closer to the engine main body than the power generating rotor and at a remove from the power generating rotor.

Abstract: The present invention achieves reductions in the weight and size of a general purpose engine provided for a power generation application. An optional external apparatus can be attached to one shaft part of a rotary shaft, and an axial gap type motor/generator constituted by a power generating rotor (inner rotor) and a stator is attached integrally to another shaft part of the rotary shaft.

Abstract: A magnet assembly includes a back iron and an array of magnets. The back iron is in the form of a plate having opposed surfaces. The magnets are arranged along one of the surfaces, with the other surface being dimensioned and configured according to the magnetic field distribution associated with the magnets. The back iron geometry provides for reduced mass, reduced leakage flux, and high flux densities to improve performance of a linear motor that employs such a magnet assembly. Additionally, the back iron can be a magnetically conductive annular ring, such as is employed in a rotary motor. Moreover, the magnets can be arranged in a manner that generates a Halbach array to increase force output in a desired direction while canceling stray magnetic fields in other directions. Similar reduced-mass designs can be employed in conjunction with a back iron of a fixed cross-section and magnets of variable thicknesses, variable lengths, and/or variable widths.

Abstract: An axial-flux electric machine includes a stator and a rotor. The rotor may be rotatable about a rotor rotation axis, and at least a portion of the stator may face at least a portion of the rotor at an axial interface between the stator and the rotor. The rotor may include a rotor body and a permanent-magnet cluster that includes a plurality of permanent magnets mounted to the rotor body. The permanent-magnet cluster may cause magnetic flux to flow across the axial interface between the permanent-magnet cluster and the stator. The plurality of permanent magnets of the permanent-magnet cluster may include one or more permanent magnets forming a first axial permanent-magnet layer and one or more permanent magnets forming a second axial permanent-magnet layer disposed between the first axial permanent-magnet layer and the axial interface.

Abstract: An electric fan includes a stationary assembly and a rotor (40) being rotatable with respect to the stationary assembly. The stationary assembly includes a support member (16) located at a center portion thereof, and a stator (20) mounted around the support member. The rotor includes a blade set (41) having a rotary shaft (412) extending from the blade set toward the stationary assembly and pivotably supported by the support member. A rail assembly consisting of a lower rail (18) and an upper rail (49) is attached to the stationary assembly and the blade set to movably support the rotor on the stationary assembly.

Abstract: A two-phase electric motor includes first and second coil groups and a magnet group. In the magnet group, N poles and S poles are disposed alternatively opposite the first and second coil groups. The first and second coil groups are disposed at positions that are out of phase with each other by an odd multiple of ?/2 in electrical angles. The coils of the first and second coil groups have substantially no magnetic material cores, and the electric motor has substantially no magnetic material yoke for forming a magnetic circuit.

Abstract: A permanent magnet type magnetic pole core structure capable of minimizing the cogging torque for a rotating electric machine such as an electric motor or a power generator is disclosed. The rotating electric machine comprises: a magnetic pole core and an armature core. The magnetic pole core comprises a plurality of magnetic pole structures in a number of M, while each magnetic pole structure comprises at least one permanent magnet and can be used for defining two reference lines with an expanding angle sandwiched therebetween, and a periphery of the magnetic pole core enclosing the pole structure defining between the two reference lines is divided into a first arc surface, a second arc surface and a third arc surface. In an exemplary embodiment, the armature core comprises a plurality of slot structures in a number of S. The ratio of the amount of slot structure to the amount of the magnetic pole structure, i.e. S/M, is 3/2.

Abstract: An electrical roller drive which can be connected to a roller includes a disk-type motor with a secondary part in the form of a disk and with a primary part in the form of a disk.

Abstract: An electric disk motor having a primary part and a secondary part is connected to a machine by bearing-mounting the primary part on a drive shaft of the machine and by securely fixing the primary part to a supporting structure for support of the machine.

Abstract: A rotor 31 has permanent magnets 31a disposed on a surface of a disk-shaped back yoke 31b in such a manner that long sides of each permanent magnet extend in a radial direction and that a South pole and a North pole of the permanent magnet 31a are arranged in a circumferential direction. The four permanent magnets 31a are equally spaced from one another in the circumferential direction, and circumferentially-opposed magnetic poles of any two adjacent permanent magnets 31a are of the same magnetic polarity. Rotor cores 31c of a generally fan-shape are fixed to the back yoke to generally cover the four permanent magnets 31a. A flux barrier 31d for reducing the short-cutting of magnetic flux of the permanent magnet 31a is provided between any two adjacent rotor cores 31c, and is disposed at a radially-extending central portion of the permanent magnet 31a.

Abstract: A composite rotor for an axial airgap, permanent magnet dynamoelectric machine comprises a plurality of magnet subassemblies adhesively bonded together to form the rotor. Each magnet subassembly comprises a rotor permanent magnet and an optional spacer. A fibrous belt is wrapped around the periphery of each subassembly to provide high tensile strength at least along the radial sides of the subassembly. The belt is preferably infiltrated with an adhesive agent, such as an epoxy resin, that is used to bond the subassemblies. The rotor is thereby provided with high strength and low mass, making it suitable for use in a high-speed, high pole count electric machine.

Abstract: The invention relates to a brushless electric motor, comprising a stator and an armature with armature teeth and permanent magnets in accumulative order, the armature being made from a laminated core with grooves and the armature teeth and grooves have a particular embodiment. The commutation time for the phase windings of the stator is selected such that subsequent control of the commutation time is not necessary, the torque being approximately equal at the start and the end of an armature stage.

Abstract: Provided is a small motor superior in weight/torque balance. A phase stator 10 and B phase stator 12 are disposed to face each other. A rotor is interpositioned between these stators. Electromagnetic coils are provided to the stators evenly in the circumferential direction. A permanent magnet is provided to the rotor evenly in the circumferential direction. The exciting polarity of the electromagnetic coil is alternately opposite, and this is the same for the permanent magnet. A signal having a prescribed frequency is input to the A phase electromagnetic coil and B phase electromagnetic coil. The rotor rotates between the stators as a result thereof.

Abstract: A brushless generator has a high rotation speed, a high usage efficiency, no iron loss and a small mechanical loss while the electric power output of the generator is increased

Abstract: A simplified fan device includes a base plate, a flat-type impeller, a magnet sheet and a shaft member. The base plate includes an axial hole and at least one stator coil arranged thereon. The flat-type impeller is formed with an annular supporting plate, an assembling hole and a series of bent vanes. The magnet sheet provides with a center through hole and at least one pair of alternatively opposite magnetic poles (i.e. north pole and south pole). A first distal end of the shaft member is mounted to one of the assembling hole of the flat-type impeller and the center through hole of the magnet sheet or both. Correspondingly, a second distal end of the shaft member is extended through and rotatably received in a bearing member mounted in the axial hole of the base plate so as to constitute a thin-type structure.

Abstract: A brushless electric motor includes a housing with a pair of disc-shaped end plates fixed relative to the housing in a spaced, generally parallel relationship to each other. A pair of bearings are respectively positioned in the end discs. A motor shaft is rotatably journalled in the bearings for rotation about its axis. A stator assembly is supported by the housing intermediate the end plates and through which the motor shaft passes. The stator assembly includes a plurality of individual wire-wound coils in a toroidal array around the axis of the shaft. The stator assembly has recesses in opposite faces thereof. A pair of disc-shaped rotor assemblies are respectively disposed within the recesses in the opposite faces of the stator assembly inside the end plates.