492 results about "Axial flux" patented technology

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.

An axial flux switched reluctance motor utilizes one or more rotor discs spaced along a rotor shaft, each rotor disc having a plurality of rotor poles spaced along the periphery thereof. Stator elements are distributed circumferentially about the rotor discs and form pairs of radially extending stator poles for axially straddling the rotor discs. Stator coils as switched on to energize pairs of stator poles for forming an axial and radially inward flux path for rotating the rotor poles for minimizing the flux path before switching off the stator coil. Two or more rotor discs can be rotationally indexed for providing two or more motor phases. In manufacture, rotor discs and circumferentially extending stator coils about the periphery of each rotor disc are fit to a stator housing. Each stator element is then fit radially through the stator housing and secured thereto for straddling the rotor discs.

A power unit assembly which has a pair of mirrored axial flux electric motors having a common axis of rotation, each axial flux motor including a rotor disposed on a rotor shaft and at least one stator disposed in operative relationship to said rotor. A common end plate is disposed between each of the pair of axial flux electric motors to provide a common mounting structure, while an output hub is operatively coupled to each rotor shaft of the pair of mirrored axial flux electric motors. Each of the pair of mirrored axial flux electric motors is operatively configured to provide independent speed and torque to each associated output hub.

A permanent magnet generator is described. The generator includes a shaft which defines a longitudinal axis. A rotatable magnetic field assembly is mounted on the shaft and adapted for rotation about the shaft. The magnetic field assembly includes a plurality of axially magnetized magnets which are retained in a cavity about the shaft for generating an axial magnetic flux. A plurality of vanes are mounted on the magnetic field assembly housing for rotating the magnetic field assembly about the shaft when a fluid flows past the vanes. A stationary armature assembly is also located around the shaft in a position axially spaced from the magnetic field assembly. The armature assembly generates AC power when the magnetic field assembly is rotated. The stationary armature assembly includes an armature housing. An axial bore is formed through the armature housing for receiving the shaft. The armature housing defines a cavity about the axial bore in which a plurality of laminated bars are retained. A plurality of electrically conductive wires are wrapped around the laminated bars to form coils.

The invention relates to an axial flux induction electrical machine comprising a frame, a shaft (1) bearing-mounted to the frame, a disc-like rotor (2) supported to the shaft, a stator (4) comprising a stator winding (3) and supported by the frame on the first side of the rotor in axial direction. The disc-like rotor (2) comprises a non-ferromagnetic rotor frame (8) fabricated of a material with high electrical conductivity and comprising a uniform inner periphery (9) and an outer periphery (10) and conductor bars (11) fabricated of the same material and galvanically connecting the peripheries (11), the conductor bars together with the inner and outer peripheries forming in addition to the rotor frame also the cage winding of the rotor. In addition, between the inner periphery and the outer periphery there is a plurality of ferromagnetic pieces (12) extending through the frame plate and being spaced apart from each other at an appropriate distance so that the radial conductor bars are appropriately located between the pieces. According to the invention, the disc-like rotor frame (8) comprises at least one circular plate machined of work-hardened metal sheet.

Systems and methods for improved generators are described. One embodiment includes an assembly for an axial flux generator, the assembly comprising an arc-shaped rotor section that includes a rotor support configured to rotate around an axis of a generator, and an at least one rotor element for power generation that is connected to the rotor support; an arc-shaped stator section comprising a stator support and an at least one stator element for power generation connected to the stator support; wherein the rotor section and the stator section are configured to provide an axial air gap between the at least one rotor element and the at least one stator element, and wherein the at least one rotor element and the at least one stator element are positioned to be at substantially the same radial distance from the axis of the generator.

Methods and apparatus are provided for an axial electric motor. The apparatus comprises, a stator having coils thereon for producing a magnetic field, a rotor rotated by the magnetic field, and an output shaft coupled to the rotor. The rotor includes a magnetic and non-magnetic component. The non-magnetic component has a lower density than the magnetic component. One or both of the rotor components have apertures therein for ventilation and weight reduction. Permanent magnets are desirably mounted on the magnetic component of the rotor facing the stator and portions of the rotor behind the permanent magnets are hollowed out to be thinner than portions of the rotor between the permanent magnets. This reduces rotor weight without significantly affecting magnetic flux density in the rotor or motor torque.

An axial flux brushless permanent magnet electrical machine having a stator and at least one rotor. The rotor includes a Halbach array of magnets with at least four magnets per magnetic cycle. The rotor magnets are contained within pockets in the rotor. The pockets are formed with magnet pocket walls being radial walls, active surface walls, and/or inactive surface walls where the walls retain the magnets within the pockets.

Methods and apparatus are provided for an axial electric motor. The apparatus comprises, a stator having coils thereon for producing a magnetic field, a rotor rotated by the magnetic field, an output shaft coupled to the rotor, and a ring incorporating a coolant channel circumferentially engaging the stator for absorbing heat and reaction torque from the stator. It is preferable that that the ring have inwardly extending teeth that mesh with the coils on the stator. The space between the teeth and the coils is preferably filled with a substantially solid thermally conductive material to transmit stator reaction torque to the teeth and cool the stator. The coils are preferably formed from a flat ribbon a portion of whose principal surface is perpendicular to the teeth. A supporting frame is desirably fixedly coupled to the ring and rotatably coupled to the output shaft.

A unitary amorphous metal magnetic component for an axial flux electric machine such as a motor or generator is formed from a spirally wound annular cylinder of ferromagnetic amorphous metal strips. The cylinder is adhesively bonded and provided with a plurality of slots formed in one of the annular faces of the cylinder and extending from the inner diameter to the outer diameter of the cylinder. The component is preferably employed in constructing a high efficiency, axial flux electric motor. When operated at an excitation frequency “f” to a peak induction level B_max the unitary amorphous metal magnetic component has a core-loss less than “L” wherein L is given by the formula L=0.0074f(B_max)^1.3+0.000282f^1.5(B_max)^2.4, the core loss, excitation frequency and peak induction level being measured in watts per kilogram, hertz, and teslas, respectively.

The present invention is a apparatus of multi-unit modular stackable switched reluctance motor system with parallely excited low reluctance circumferential magnetic flux loops for high torque density generation. For maximized benefits and advanced motor features, the present invention takes full combined advantages of both SRM architecture and “Axial Flux” architecture by applying “Axial Flux” architecture into SRM design without using any permanent magnet, by modularizing and stacking the “Axial Flux” SRM design for easy configuration and customization to satisfy various drive torque requirements and broad applications, and by incorporating an en energy recovery transformer for minimizing switching circuitry thus further lowering the cost and further increasing the reliability and robustness. Unlike prior arts, the present invention does not use any permanent magnet and this “Axial Flux” SRM system is modularized and stackable with many benefits.

A wheel-hub motor (100) comprises a rotor (14) having permanent magnets, although other field generation means are available, and a stator (12). The stator has coils (22) wound on stator bars (16) for interaction with the magnetic field of the rotor across an air gap (26a,b) defined between them. The stator (12) forms a housing of a chamber (70) containing refrigerant (82). The stator housing has heat dissipating fins (96) accessible by the open environment whereby air movement relative to the housing caused at least by rotation of the rotor absorbs heat from the fins. The motor may be an axial flux machine, the coils being wound on bars that are disposed circumferentially spaced around a rotation axis (80) of the rotor. The wheel of the vehicle is mounted directly on the rotor housing.

An axial-flux electric motor includes a stator having a plurality of stator windings and a plurality of stator pole-pairs, a first rotor configured to magnetically interact with the stator in an axial direction, the first rotor is positioned on one side of the stator, having a plurality of permanent magnets embedded thereon with a plurality of rotor pole-pairs, a second rotor configured to magnetically interact with the stator in the axial direction, the second rotor is position on another side of the stator, having a plurality of permanent magnets embedded thereon with a plurality of rotor pole-pairs, and a plurality of stationary ferromagnetic segments, positioned between the stator and the first rotor and between the stator and the second rotor, the ferromagnetic segments are adapted to modulate magnetic field of the permanent magnets in the axial direction.

An axial flux electrical machine including a housing, a stator located within the housing, a rotatable shaft carried by the housing by means of at least a main bearing, and a rotor fixed to the shaft within the housing. Magnetic attractive forces between the rotor and the stator produce an axial thrust on the main bearing and a biasing means (preferably in the form of a spring) is arranged to urge the shaft in a direction opposite to the axial thrust so as to reduce the net load on the main bearing. This reduction in net load on the main bearing increases bearing life and improves motor efficiency.

The invention discloses a disc type axial-flux motor with an oil-immersed circularly cooled stator and segmented armatures. A framework with double rotors and single stator is adopted; and a main shaft is designed. Each rotor adopts a magnetic steel surface-mounting type structure; and a whole stator oil-immersion circulation cooling and heat dissipation mode is adopted for temperature rise management. The disc type axial-flux motor with the oil-immersed circularly cooled stator and the segmented armatures comprises a stator assembly, a driving end rotor assembly, a non-driving end rotor assembly, a wire outlet box assembly and a rotary transformer assembly. An engine base is provided with an oil inlet joint and an oil outlet joint, both of which can carry out oil-immersion circulation cooling for the stator and have the advantages such as high convective heat transfer efficiency, big heat exchange area and fast heat transfer speed. The disc type motor adopting such a heat dissipation structure can achieve higher power density and higher torque density, is more compact in structure and is suitable for the occasions with strict requirements on the motor mounting space in future.

A rotor for an axial flux permanent magnet machine is described. The machine has a stator comprising a stator housing enclosing a set of coils wound on stator bars or teeth and disposed circumferentially at intervals about an axis on the machine, and a rotor bearing a set of permanent magnets and mounted for rotation about the said axis. The rotor and stator are spaced apart along said axis to define a gap therebetween in which magnet flux in the machine is generally in an axial direction. The magnets are disposed circumferentially around said rotor and define a plurality, n, of matching sets of magnets. Each set of magnets includes a plurality of magnets, wherein said n sets of magnets on said rotor have n-fold rotational symmetry. Within a said set, the magnets have different shapes and/or relative circumferential spacings of adjacent magnets within the set of magnets are irregular.

An electrical machine, in particular an axial flux motor, with a rotor, mounted rotatably about a machine axis, and with a stator. The stator has a sintered support structure and an insert connected thereto, which forms at least partially a pole shoe, and which comprises a lamination stack.

An axial-flux thin-plate motor is disclosed, which includes: a stator formed of an annular disk of silicon steel and comprising a plurality of teeth formed on one side of the annular disk, a plurality of insulation sleeves, each insulation sleeve having a shape which matches each tooth, and a plurality of coils, each coil formed around outside of each insulation sleeve, the coils connected and grouped to form n-phase windings in accordance with a phase number n of the motor; and a rotor formed of a ferromagnetic disk with a plurality of permanent magnets embedded on one side of the ferromagnetic disk.