Abstract: An electric machine includes a generally annular outer rotor supported to rotate about a rotational axis. The outer rotor defines an internal cavity therein and has a plurality of permanent magnets in the internal cavity generating a first magnetic field. An inner rotor is in the internal cavity and is supported to rotate about the rotational axis. The inner rotor has a plurality of permanent magnets about its perimeter that generate a second magnetic field. A generally annular stator is in the internal cavity between the outer rotor and the inner rotor. The stator has a stator winding supported by a non-magnetically conductive stator core. The stator winding is arranged to generate a field that interacts with the first and second magnetic fields. One of the outer rotor or the inner rotor is mechanically coupled to drive a load. The other of the outer rotor or the inner rotor is not mechanically coupled to drive the load.

Abstract: A rotating electric machine includes a stator and a rotor. The rotor includes an iron core and permanent magnets. The iron core includes a cylindrical connection portion and ten magnetic pole portions. The cylindrical connection portion surrounds a rotation shaft. The ten magnetic pole portions, the number of which corresponding to the number of poles, are disposed radially outside the connection portion. The connection portion and the magnetic pole portions are integrated with each other. The permanent magnets are disposed between the magnetic pole portions. The magnetic pole portions include flange portions that cover parts of radially outer surfaces of the permanent magnets while allowing at least parts of the radially outer surfaces to be exposed. Each of the permanent magnets includes a tapered portion in at least a part thereof, and the tapered portion has a length in a direction perpendicular to the radial direction that decreases radially inward.

Abstract: An electric machine system includes an electric machine and a companion device. The electric machine has a stationary member and a movable member that, by interaction of magnetic fields, at least one of moves relative to the stationary member or generates electricity when moved relative to the stationary member. One of the stationary member and the movable member includes a permanent magnet. The companion device is coupled to the electric machine to communicate mechanical movement with the movable member. In certain instances, the electric machine system has adaptations for operation of the electric machine system subsea and/or in a corrosive environment.

Abstract: There is provided a motor including: a sleeve supporting a shaft; a hub operating together with the shaft and including a magnet; a base coupled to the sleeve and including a core having a coil wound therearound, the coil generating rotational driving force; and a magnetic flux increase space part formed to be enclosed between the magnet and the hub in order to increase magnetic flux density between the magnet and the core.

Abstract: An overmolded-type rotor for an outer rotor-type electric motor, wherein, in addition to a backing ring and magnets, a metallic coupler that comprises an inner axial surface configured to interface with a shaft to be driven by the rotor and an outer axial surface that corresponds to a multiplicity of outer teeth is overmolded with a polymer frame.

Abstract: An electric motor (10) is constructed with an inner circumference side rotor (11) and an outer circumference side rotor (12) which are coaxially arranged; and planetary gear mechanism which rotates at least one of the inner circumference side rotor (11) and the outer circumference side rotor (12) around an rotary shaft O. Long sides of substantially plate-like inner circumference side permanent magnets (11a) of the inner circumference side rotor (11) and those of substantially plate-like outer circumference side permanent magnets (12a) of the outer circumference side rotor (12) are arranged so as to face each other by the rotation of at least one of the inner circumference side rotor (11) and the outer circumference side rotor (12) in a cross section perpendicular to the rotary shaft O with the planetary gear mechanism.

Abstract: An electric motor that generates mechanical energy whilst increasing both the motor efficiency and the mechanical power density. The electric motor includes: a plurality of disk surfaces having a main longitudinal axis; a plurality of stationary support structures; and a rotating shaft affixed to the disk surfaces. Each disk surface is coupled to an array of offset magnets. The magnets are arranged as matching magnetic pairs on two adjacent disk surfaces to create a plurality of magnetic fields between the matching magnetic pairs. The magnetic fields are titled at an angle A with respect to the main longitudinal axis. Each stationary support structure has an electromagnetic coil array located in-between each of the matching magnetic pairs, which provides an axial magnetic field when voltage is applied on the electromagnetic coil. Each of the electromagnetic coil array is titled at said angle A with respect to the main longitudinal axis.

Abstract: A rotor and a motor are provided in which the q-axis inductance is increased and the leakage of magnetic flux is prevented to ensure high power operation at high level driving speeds. The rotor includes a rotor core, which is formed at the center thereof with a hole coupled to a shaft, and a module configured to be coupled to the rotor core and comprises a pair of first permanent magnets, which are space apart from each other, and a first connection part connecting ends of the first permanent magnets to each other.

Abstract: Some embodiments of the present disclosure provide a rotor of an electric brushless motor configured to be light weight and prevent vibrations generated during an operation of the motor to be transferred to the shaft of the rotor. The rotor includes a shaft elongated in a rotational axis, a single body magnet comprising alternately magnetized portions, and a vibration absorption portion interposed between the shaft and single body magnet. The vibration absorption portion absorbs vibrations generated during the operation of the motor and can include an elastic or a non-elastic material. The rotor further includes a non-elastic portion inhibiting the expansion of the vibration absorption portion when the vibration portion is elastic.

Abstract: A method for manufacturing sintered magnet poles is described. The mold is filled with a vitrifiable base material powder and closed with a plate. A magnetic field aligns the powder and a plate pressed onto the powder establishes a compact that holds the alignment in place. The compact is sintered to form a sintered magnet pole. The mold forms a protective cover of the sintered magnet pole and the plate forms a base plate of a magnet pole piece. Furthermore, a magnet pole piece is provided which has a magnet pole and a base plate which is fixed to a protective cover so that the base plate and the protective cover surround the magnet pole. The base plate and/or the protective cover of the magnet pole piece has at least one element that provides a geometrical locking of the magnet pole to the base plate and/or the protective cover.

Abstract: The rotor assembly contains a number of polar anisotropic ring magnets sequentially stacked, a number of supporting rings within the stacked ring magnets, and an axle threading through the supporting rings. The ring magnets are of a same diameter and length. Each supporting ring contains three co-centric rings: an inner steel ring, a middle rubber ring, and an outer steel ring. The supporting rings are positioned with substantially equal spacing and with a gap away from each aperture of the stacked ring magnets, so that additional weight elements could be positioned and adhered within the gap. The periodic positioning of a number of supporting rings could significantly reduce the weight of the motor assembly with much improved steadiness. Additionally, the middle rubber rings of the supporting rings provide a buffer mechanism for absorbing vibration and noise reduction.

Abstract: A rotor for an electric rotary machine and a method of manufacturing the same are disclosed wherein none of permanent magnets is fixed to a magnetic supporting segment of a magnet support ring in advance and each permanent magnet is assembled separately of the magnet support ring. Prior to the assembling of the permanent magnets, the magnet support ring is preliminarily located on claw-shaped magnetic poles at inner peripheral sides thereof under a state combined with a pair of field iron cores, after which the permanent magnets are inserted to magnet insertion spaces in longitudinal directions. The rotor includes positioning and restricting means for precluding the occurrence of positional displacement of each permanent magnet with respect to each magnet supporting segment of the magnet support ring.

Abstract: The present invention provides a permanent magnet rotor arrangement for a rotating electrical machine including a rotor body having an outer rim. A circumferential array of magnet carriers is mounted to the rotor body by fixing members and support members and is spaced apart from the rotor body in the radial direction to define a series of axially gaps or spaces which can optionally be used as passages for cooling air. At least one pole piece made of permanent magnet material is located adjacent to a surface of each magnet carrier. The magnet carriers and pole pieces preferably have a laminated or divided construction to virtually eliminate eddy currents that may be particularly problematic in certain types and construction of electrical machine. The flux path between adjacent pole pieces flows in the circumferential direction within the magnet carriers and does not use the rotor body.

Abstract: A wind turbine generator includes: a main shaft; a generator having a rotor and a stator; and a sleeve coupled to the rotor and inserted onto the main shaft. The stator includes: stator magnetic poles arrayed circumferentially of the main shaft; and first and second stator plates rotatably coupled to the main shaft to support the stator magnetic poles. The rotor includes: rotor magnetic poles and at least one magnetic pole supporting structure coupled to the main shaft to support the rotor magnetic poles and provided between the first and second stator plates such that the rotor and stator magnetic poles are detachable from the sleeve. Positions at which the rotor and stator magnetic poles are detachable from the sleeve are closer to the main shaft from a closer end of the main shaft to the generator.

Abstract: An electrical rotating machine rotor, in particular for a motor vehicle, comprising a central shaft, an annular core coaxial with the shaft and two polar wheels which are axially arranged on either side of the core, of the type wherein the shaft includes at least one drive section which is axially force-fitted into a fixing bore of at least one component of the rotor so as to secure in rotation at least one of the two polar wheels of the rotor to the shaft, an intermediate sleeve being radially interposed between each polar wheel and the central shaft, and on which sleeve is mounted said polar wheel. The invention also concerns a method for making such a rotor.

Abstract: A dual-speed single-phase AC motor, including: a stator, including a stator core, and a coil winding, including a starting winding, a first main winding, and a second main winding, a rotor, and a starting circuit, including a rectifying and voltage-stabilizing circuit, a detecting circuit, a voltage comparison circuit, a first switching circuit, a second switching circuit, and a third switching circuit. The number of poles of the starting winding is the same as that of the first main winding. The number of poles of the first main winding is less than that of the second main winding.

Abstract: In a three-phase permanent-magnet synchronous machine, a pole gap and a skew of permanent magnets on the rotor are designed such that oscillating torques which are caused by the fifth and seventh harmonics of the stator field and of the rotor field are mutually reduced. In particular, the skew can be chosen as a function of the pole gap, such that the majority of the respective oscillating torques is neutralized. This results in minimal torque ripple.

Abstract: A motor rotor has: a rotor yoke; a plurality of magnet fixing sections formed on the lateral surface of the rotor yoke; segment magnets respectively fixed to the magnet fixing sections and extending in the axial direction of the rotor yoke; and a plurality of projections which are provided, on the rotor yoke, at each boundary section located between each of the adjacent magnet mounting sections, and which protrude outward from the rotor yoke; and a pair of end claws are formed by bifurcating the end of each projection into two prongs, and each of the end claws is locked to the outer surface of each of the segment magnets.

Abstract: A permanent magnet rotating electrical machine comprises a stator with a stator coil applied in a plurality of slots provided in a stator core, a rotor disposed opposite to the stator with a predetermined gap interposed therebetween, the rotor including a permanent magnet embedded in each of magnet-insertion holes provided in a rotor core of the rotor while polarity of the permanent magnet being varied on a pole-by-pole basis, and end plates disposed at ends of the rotor core, in the axial direction thereof, respectively, in which one end plate of the end plates disposed at the ends of the rotor core, in the axial direction thereof, respectively, is also provided with magnet-insertion holes, and each of the magnet-insertion holes provided in the one endplate is filled up with a non-magnetic material, thereby stopping up each of the magnet-insertion holes provided in the end plate.

Abstract: A split-pole magnetic module for use in large permanent magnet machines. The split-pole magnetic module has at least two permanent magnets positioned within a lamination stack at an angle relative to each other so that magnetic flux enters a first portion of an outer surface of the lamination stack and exits a second portion of the outer surface of the lamination stack. Consequently, little if any magnetic flux passes through, or is carried by, the support structure of a rotor or a stator.

Abstract: A rotor structure for a permanent magnet electromotive machine is provided. A back-core lamination is disposed around a plurality of permanent magnets. The back-core lamination comprises a plurality of high-reluctance regions arranged to attenuate asynchronous magnetic flux components while avoiding synchronous magnetic flux components. The asynchronous and synchronous magnetic flux components result from spatial harmonic components of a plurality of fractional-slot concentrated windings of a stator of the machine.

Abstract: The disclosure relates to a three-phase electric motor that uses high magnetic energy permanent magnets and that has a low detent torque. The motor consists of a rotor with N pairs of poles and of a stator portion with teeth extending radially from an annular gear. The teeth have windings and the ends thereof comprise an arc of circle, the middle of which is located on a radius R1 and two sides defining an alpha angle, the vertex of which is located on a radius R2. The ratio R2/R1 is substantially equal to (1+/?0.26/N), and the alpha angle is between 110 and 135°.

Abstract: A rotor (11) for an electric machine with low-inertia permanent magnets (13) located between the poles (15) of the electric machine and a rotor hub, where the rotor hub is comprised of an internal ferrule (21) and an intermediate ring (23) between it and said magnets (13), with said intermediate ring (23) being made of an amagnetic material (such as aluminum, a composite material or a plastic material) of minimum thickness which prevents flux losses, and with the internal ferrule (21) being made of a metal material (such as cast iron or steel) with sufficient thickness to resist, together with the intermediate ring (23), the mechanical stresses caused by rotor (11) operation.

Abstract: A dynamoelectric machine includes first and second magnet seat portions disposed to project from portions of first and second yoke portions that face respective inner circumferential surfaces near tip ends of second and first claw-shaped magnetic pole portions, and magnet housing portions disposed integrally to extend axially outward from outer circumferential portions of a pair of flange portions of a bobbin, extend near the first and second yoke portions that face the inner circumferential surfaces near the tip ends of the first and second claw-shaped magnetic pole portions, and be held by the first and second magnet seat portions.

Abstract: A magnetic generator, or a so-called inner-rotor generator, provided with a rotor on the inside of a stator. The rotor has a ring-shaped yoke and a magnet integrally mounted in advance to the outer circumferential surface of the yoke. The rotor is mounted to a hub spindle of a rotating body.

Abstract: A spindle motor for use in a 2.5 inch 7 mm high disk drive apparatus includes a base portion; a stator arranged above the base portion; a rotor hub including a cover portion positioned above the stator, and a side wall portion arranged to extend downward from an outer edge of the cover portion; a rotor magnet positioned radially outward of the stator, and fixed to an inner circumferential surface of the side wall portion of the rotor hub; and a bearing mechanism arranged to support the rotor hub and the rotor magnet such that the rotor hub and the rotor magnet are rotatable with respect to the base portion and the stator. A height of the rotor magnet as measured in an axial direction is preferably in a range of about 2 mm to about 3 mm (both inclusive), and a height of a stator core of the stator as measured in the axial direction is preferably in a range of about 50% to about 75% (both inclusive) of the height of the rotor magnet.

Abstract: In the case of a magnet system (1) of a multipole generator, in particular for a wind energy installation or wind power installation, comprising a magnet ring (2, 2?, 2a?-2c?, 2a-2j) having a support (5) on whose external circumference or internal circumference individual permanent magnets (4, 4?) are arranged in one or more rows with a regularly changing polarity alignment, the aim is to provide an assembly capability which makes it possible to equip an external rotor or an internal rotor for a generator of a wind power installation with a multiplicity of individual permanent magnets, which are arranged close to one another, in a manner which is simple and advantageous for assembly. This is achieved in that a plurality of magnet rings (2, 2?, 2a-2j, 2a?-2c?) are joined together at the side, in the axial direction, coaxially and resting on one another, to form a magnet wheel (10).

Abstract: An overmolded-type rotor for an outer rotor-type electric motor, wherein, in addition to a backing ring and magnets, a metallic coupler that comprises an inner axial surface configured to interface with a shaft to be driven by the rotor and an outer axial surface that corresponds to a multiplicity of outer teeth is overmolded with a polymer frame.

Abstract: A motor rotor includes an annular body and a positioning protrusion installed on an inner lateral surface of the annular body. A magnetic body may be positioned by propping its lateral surface against the positioning protrusion, without the use of additional jigs. Therefore, the time needed to assemble the magnetic body to the annular body is saved, and the manufacturing cost of the whole motor is reduced.

Abstract: Disclosed herein is a spindle motor including: a rotating part including a hub coupled to a rotating shaft and a magnet coupled to the hub; and a fixing part including a sleeve supporting the rotating shaft and an armature facing the magnet, wherein the magnet has a contact part formed on an upper end portion thereof in a direction of the rotating shaft, the contact part partially contacting a lower end portion of the hub.

Abstract: Disclosed herein is a generator having a rotor which comprises rotor excitation element-carrying modules, for example magnets, radially movable in relation to the generator shaft in such a manner, when in their retracted position, as to significantly ease generator transport and assembly. The use of these movable magnet-carrying modules is particularly useful in direct drive-type generators which do not require a multiplier. Another object of the invention is an assembly process which comprises a generator equipped with said radially movable magnet-carrying modules.

Abstract: The present invention provides fan with an inrunner motor. The fan includes a fan frame, a rotor and a stator. The fan frame includes a base. The rotor includes a hub, a bushing and a magnetic member, wherein the magnetic member sleeves on the bushing. The stator is disposed on the base and coupled with the rotor, and the stator includes a shaft through the bushing, wherein an end of the shaft is fixed on the base.

Abstract: In the case of a magnet system (1) of a multipole generator, in particular for a wind energy installation or wind power installation, comprising a magnet ring (2, 2?, 2a?-2c?, 2a-2j) having a support (5) on whose external circumference or internal circumference individual permanent magnets (4, 4?) are arranged in one or more rows with a regularly changing polarity alignment, the aim is to provide an assembly capability which makes it possible to equip an external rotor or an internal rotor for a generator of a wind power installation with a multiplicity of individual permanent magnets, which are arranged close to one another, in a manner which is simple and advantageous for assembly.

Abstract: A wind turbine generator includes: a main shaft; a generator having a rotor and a stator; and a sleeve coupled to the rotor and inserted onto the main shaft. The stator includes: stator magnetic poles arrayed circumferentially of the main shaft; and first and second stator plates rotatably coupled to the main shaft to support the stator magnetic poles. The rotor includes: rotor magnetic poles and at least one magnetic pole supporting structure coupled to the main shaft to support the rotor magnetic poles and provided between the first and second stator plates such that the rotor and stator magnetic poles are detachable from the sleeve. Positions at which the rotor and stator magnetic poles are detachable from the sleeve are closer to the main shaft from a closer end of the main shaft to the generator.

Abstract: A permanent magnet rotor arrangement is provided. The arrangement includes a rotor, a plurality of nonmagnetic profiled tubes defining a closed channel and affixed circumferentially along the outer rim of the rotor, and a plurality of permanent magnet pole pieces arranged in the channels. In a preferred embodiment, the tubes are monolithic and one pole piece is arranged in every channel.

Abstract: The disclosure relates to an electric machine with a permanent magnet rotor, where permanent magnets have been fitted on an outer surface of a cylindrical rotor, and relates to a permanent magnet. The permanent magnets forming the electric machine's rotor pole are shaped so that the electric machine's air gap is substantially constant in a middle of the pole, and the air gap increases in an essentially straightforward manner when moving towards the edge of the pole. The permanent magnet is of an even thickness in the middle, and becomes thinner towards the edges. This can result in a decrease in the torque ripple and cogging torque of an electric machine.

Abstract: A spindle motor is provided. The spindle motor includes a base, a bearing housing, a bearing, a rotation shaft, a stator, a bushing, and a rotor. The bearing housing is installed on the base. The bearing is fixed inside the bearing housing. The rotation shaft is installed to be supported by and rotate on the bearing. The stator is disposed around the bearing housing. The bushing is coupled to the rotation shaft. The rotor is coupled to the bushing to rotate through interaction with the stator.

Abstract: The object of the invention is a rotor for a permanent-magnet synchronous machine in which a pole structure is fitted onto the surface of the rotor body structure facing the air gap. Each of the rotor's pole structures comprises at least one permanent magnet and a shell structure fitted on top of it. According to the invention, an intermediate layer made of magnetic composite is fitted between the permanent magnet and the shell structure.

Abstract: The present invention provides a rotor of a brushless (BL) motor, including: a high-strength engineering plastic member formed by injection-molding high-strength engineering plastic around a concavo-convex portion 12a formed on the outer circumferential surface of a rotary shaft; a sound-absorbing resin element formed by injection-molding a sound-absorbing resin around the high-strength engineering plastic member; a cylindrical ring magnet assembly including a plurality of axially aligned ring-shaped magnets, each of which has a plurality of indented grooves 20a and 20b formed on both end edges of the inner circumferential surface thereof; and a high-strength plastic member formed by injection-molding a high-strength plastic between the sound-absorbing resin element and the ring magnet assembly, the high-strength plastic member having a plurality of protrusions formed on the outer circumferential surface thereof in such a fashion that each protrusion corresponds to an associated one of the indented grooves of

Abstract: The manufacturing method of a rotor holder according to the present invention includes a step in which a top plate portion having a substantially discoid shape substantially centered about a central axis, and a side wall portion extending from an outer circumferential edge of the top plate portion are formed simultaneously by feeding a metal plate in a predetermined direction and pressing the metal plate by a die. Also, the present manufacturing method includes a step in which a punched portion is formed at the side wall portion.

Abstract: An electromagnetic pulse engine is disclosed. The engine includes a housing, a drum concentrically mounted within the housing and adapted to rotate therein, a plurality of permanent magnets mounted about an internal cylindrical wall of the drum, and a plurality of electromagnets mounted radially about an annular bearing. Successive permanent magnets of the plurality of permanent magnets have an opposing polarity facing inward, where at least one electromagnet of the plurality of electromagnets is adapted to be selectively energized and de-energized to attract a first permanent magnet and to repel a second permanent magnet to rotate the drum about the plurality of permanent magnets. In addition, the engine includes an axial shaft that is secured to the drum for rotating therewith, where the annular bearing supporting the plurality of electromagnets is secured against rotation relative to the axial shaft.

Abstract: A method for manufacturing an interior magnet rotor core motor is described herein. The method includes attaching a resilient material to an inner rigid structure configured to engage a shaft associated with the motor, engaging the structure with the motor shaft, positioning the shaft and structure assembly with respect to the rotor core, and affixing the resilient material to the rotor core.

Abstract: The motor of the invention is an outer rotor type motor, and a rotor includes a cylindrical rotor frame that is opened at one end thereof in an axial direction, and a hollow cylindrical magnet attached to an inner periphery of the rotor frame. The magnet has a joining portion joined to an inside cylindrical portion of the rotor frame, and a protruding portion that further protrudes in the axial direction from one end, the outer diameter of the protruding portion is larger than the inner diameter of the rotor frame, and the joining portion is directly brought into close contact with a portion ranging from the one end to at least a portion of the inside cylindrical portion.

Abstract: There are provided an axial gap motor which can reduce the number of manufacturing steps due to permanent magnets not having to be fixed by an adhesive and which can prevent permanent magnets from being displaced or loosened so that the permanent magnets can be positioned within a rotor frame in an ensured fashion and a manufacturing method for manufacturing a rotor for the motor.

Abstract: Permanent-magnet holding projections provided at end portions of adjacent segment core pieces that face each other have connecting portions at the centers of the permanent-magnet holding projections. Permanent-magnet holding projections included in the segment core pieces that are on either side of the permanent-magnet holding projections having the connecting portions in a thickness direction are provided with receiving portions for receiving bulging portions that bulge in the thickness direction when the connecting portions are bent.

Abstract: A permanent magnet rotor arrangement that is particularly suitable for low-speed large-diameter electrical generators includes a rotor 2 having a radially outer rim 4. A circumferential array of magnet carriers 12 is non-releasably affixed to the outer rim 4 of the rotor and have a radially outer surface. An inverted U-shaped pole piece retainer 18 made of non-magnetic material such as stainless steel is affixed to each magnet carrier 12 and is formed with an axially extending channel. At least one pole piece 16 made of a magnetic material such as steel is located adjacent to the radially outer surface of each magnet carrier 12 and in the channel formed in its associated pole piece retainer 18.

Abstract: The present application provides a segmented rotor. The segmented rotor may include a center wheel, a number of rotor support segments positioned about the center wheel, and a number of active rotor components positioned about each of the rotor support segments.

Abstract: A rotor disc is disclosed for an axial flux permanent magnet rotating electrical machine. The rotor disc (12) comprises a plurality of laminations in a radial direction through the rotor disc, and a plurality of slots which pass radially through successive laminations for accommodating permanent magnets (14). The rotor disc may be formed from a spirally wound strip of material, or from groups of laminations.

Abstract: An axial flux rotating electrical machine is disclosed, which comprises a stator sandwiched between two rotors. The machine comprises retention means for retaining magnets on the rotor, the retention means comprising a back plate with a plurality of protrusions which define a plurality of pockets for accommodating the magnets. The retention means is arranged such that the magnets can be inserted into the pockets and held therein, and the retention means with inserted magnets can be fixed to a rotor so as to retain the magnets axially and tangentially. A cooling jacket for the stator, and techniques for securing the stator to the machine, are also disclosed.

Abstract: An electrically powered vehicle has a motor, controller and power supply contained within a wheel compartment. A cylindrical stator frame is fixed on the wheel axle, with an inner surface of the stator frame defining a space for housing the power supply and controller circuitry. A plurality of electromagnet stator segments are mounted on an outer surface of the stator frame. A cylindrical rotor frame is coupled to the axle through bearings. An inner surface of the rotor frame supports a plurality of permanent magnets that surround the stator segments to form a radial air gap therebetween. Mounted to the outer surface of the rotor frame by appropriate supporting structure is a vehicle tire.