Abstract: The disclosure presents configurations and analyses of magnetic gears, which may be used in the second stage of a multistage magnetically geared generator for a marine hydrokinetic generator application and/or other applications as described. In order to reduce field harmonics and maximize the torque density, a Halbach rotor topology is utilized. One feature of the disclosed configuration is a unique magnet arrangement that enables inner and outer Halbach rotor magnets to be more easily assembled, even with dimensional tolerance inaccuracies. The disclosed Halbach magnet rotor topology makes use of the internal magnet forces to retain the magnets in position, and the disclosed configuration also helps with the assembly process.

Abstract: An external rotor of a device for contactless transmission of rotary movements, for example of an electric motor, a magnetic transmission, a generator or a magnetic coupling, may include a plurality of different permanent magnet segments configured ring segment-like that are alternatingly arranged in a closed permanent magnet segment ring. At least one lateral surface of at least one permanent magnet segment of the plurality of permanent magnet segments may deviate from a radial direction. The at least one permanent magnet segment via the at least one lateral surface may be in contact with another permanent magnet segment of the plurality of permanent magnet segments.

Abstract: An electric machine having a stator and a rotor which is mounted so as to be rotatable about a rotor axis and has a rotor body, in which at least two permanent magnets are arranged in receptacles, a first of which component magnets is associated with a first set of permanent magnets, and a second of which component magnets is associated with a second set of permanent magnets. The permanent magnets of the first set differ from the permanent magnets of the second set with respect to the material composition, In particular to the magnetic properties, and wherein at least one permanent magnet of the first or second set or at least one composite body has a contour, the cross-sectional face of which, being located perpendicularly with respect to the longitudinal axis, decreases within the respective receptacle towards that end thereof which is radially further to the outside.

Abstract: In an IPM motor rotor, a rotor core has a plurality of magnetic poles, and each magnetic pole is formed by two permanent magnets. The two permanent magnets of each magnetic pole are two split pieces obtained by splitting one parent permanent magnet that is larger than the permanent magnets.

Abstract: A field gradient motor with a stator housing and first and second stator disks fixed to the stator housing for turning B-field flux lines 90 degrees toward a motor air gap of the field gradient motor. A shaft is rotatably retained by the housing, and a rotor has a hole and keyway for producing a nonferrous hole through the shaft. A plurality of tangentially magnetized triangular magnets are fixed to the rotor. In operation, the stator housing, the stator disks, the rotor, the permanent magnets, and the shaft cooperate with the coil produce an electromagnetic action of the motor. The stator housing can be an iron ring, and the first and second stator disks and the rotor can be steel.

Abstract: A three-phase PMAC motor comprises a rotor and a stator. The rotor includes a rotor iron core, a plurality of rotor teeth, a plurality of rotor slots each formed between two adjacent rotor teeth, and a plurality of permanent magnets disposed in respective rotor slots and attached on the rotor iron core. The plurality of permanent magnets forms at least 8 pairs of magnet poles with one or two permanent magnets being associated with one pair of magnetic poles. The stator includes a stator iron core, a plurality of stator teeth protruding inwardly from inner surface of the stator iron core, three groups of armature windings wound around each of the stator teeth, and a plurality of stator slots formed between two adjacent stator teeth. Each group of armature windings is associated with one electrical phase. An electrical phase shift exists between each two armature windings.

Abstract: A coil manufacturing method for manufacturing a wave wound coil in a substantially cylindrical shape by shaping a linear conductor with a cross-sectional shape having directionality, includes: transferring a linear wave conductor shaped in a substantially rectangular waveform, and having straight side portions extending in a wave width direction, one-side connecting portions sequentially connecting every other pair of adjacent side portions at ends on a one wave width direction side, and other-side connecting portions sequentially connecting pairs of adjacent side portions that are not connected by the one-side connecting portions at ends on an other wave width direction side; first bending the one-side and second bending the other-side connection portions so that the side portions are arranged along a coil circumferential direction, and directions of cross-sectional shapes of the side portions are in a constant direction with respect to a coil radial direction; and winding the bent wave conductor on a bobbin

Abstract: A method of making a wound field for a brushless direct current motor, direct current generator, alternating current motor or alternating current generator, includes providing a base mold and a press mold. Next, a number of phases is determined. At least one strand of conductive material per phase is formed between the base mold and press mold into a conductive coil that has a shape that indicates the number of poles required. Each conductive coil is inserted into the stator core, and the stator core is installed into one of a brushless direct current motor, direct current generator, alternating current motor or alternating current generator.

Abstract: A method of making a wound field for a brushless direct current motor, direct current generator, alternating current motor or alternating current generator, includes steps of providing a base mold and a press mold. Another step comprises determining a number of phases. At least one strand of conductive material per phase is formed between the base mold and press mold into a conductive coil that has a shape that indicates the number of poles required. Each conductive coil is inserted into the stator core, and the stator core is installed into one of a brushless direct current motor, direct current generator, alternating current motor or alternating current generator.

Abstract: MP-A and MP-T machines are members of the Multipolar (MP) family of electric motors/generators and have similarly low weight and high power densities. Their current tubes comprise conductive “S-ribbons” in electrically non-conductive material. S-ribbons are shaped so as in operation to periodically substantially overlap a multiplicity of neighboring zones of high magnetic B-field, alternating with gaps with low B in which B changes sign. Accordingly, MP-A and MP-T machines, respectively, generate AC and 3-phase current in the generator mode, and as motor are driven by AC or 3-phase at the appropriate frequency. Two modifications are introduced: (i) Machines with stationary magnet tubes/rotating current tube and (ii) machines with stationary current tube/rotating magnet tubes. The latter do not require electrical brushes and are eminently suited for simultaneous multiple uses. Also, these may operate while immersed in hostile fluids, including sea water.

Abstract: A rotor is deployed such that the rotor becomes coaxially rotatable with a stator. A shaft is fixed onto the axis of a rotor iron-core. 1-pole constituting magnet slots are deployed into V-character pattern along an outer circumference portion of the rotor iron-core. Permanent magnets are embedded into the magnet slots. For the 1 pole, the 2 pieces of same-polarity permanent magnets are embedded into the V-character pattern. The configuration of each embedded permanent magnet is designed as follows: From the thickness of the permanent-magnet edge portion on the inner-diameter side of the rotor iron-core, which becomes the center of the V-character pattern, the thickness of the permanent magnet gradually increases toward the outer-diameter side of the rotor iron-core, which become the right and left edge portions of the V-character pattern. Simultaneously, curved lines are provided on both edge portions of the permanent magnet.

Abstract: A winding for an n-phase electric motor is disclosed. The inventive winding comprises a number of consecutive winding groups of n individual windings, wherein at any point in time an individual winding of a first group exhibits one direction of current flow and wherein at the same point in time a corresponding individual winding of an adjacent group exhibits the opposite direction of current flow. There is also disclosed a method for preparing such winding. It is further disclosed a magnetic unit adapted for such winding, comprising permanent magnets being essentially triangular in cross-section. Further, there is disclosed electric motors using the inventive winding concept, as well as geodetic instruments taking advantage thereof. An electric motor according to the disclosed inventive concept is particularly well suited for direct drive.

Abstract: A method of making a wound field for a brushless direct current motor, direct current generator, alternating current motor or alternating current generator, includes providing a base mold having an engagement face with at least one movable end turn form. A number of distinct phases is determined and at least one strand of conductive material is wound around at least one movable end turn forming tool per distinct phase. One conductive coil is created from each strand of conductive material for each distinct phase. Each conductive coil is formed into a configuration that indicates the number of poles required. Each conductive coil is then placed onto an insertion instrument. The insertion instrument and each conductive coil are inserted into a stator core. The insertion instrument is removed from the stator core, and the stator core is installed into one of the aforementioned motors or generators.

Abstract: In electric machines, core losses limit, at high fundamental frequency, the permissible full-load power. The aim of the invention is to develop a design which enables a high power density at high magnetic reversal frequencies and which is easy to produce. To this end, the primary part comprises coils which, for the majority of their length, run in the direction of movement and which are surrounded in this area on three sides by soft magnetic material. In the direction of movement, at least two coils are arranged one behind the other. Coils of different phase are arranged perpendicular to the direction of movement inside different running tracks. In the secondary part, at least two oppositely magnetized hard magnets with three collector segments, which are flatly adjacent in a manner that is perpendicular to the direction of movement, form magnet poles having a high flux concentration.

Abstract: The invention relates to an electric machine comprising a stator (10, 40) provided with a plurality of teeth (11, 41), each tooth supporting at lest one individual coil (13, 46, 47), an external rotor (30) which is radially arranged outside the stator and provided with constant magnets, an internal rotor (20) radially arranged inside the stator, provided with constant magnets and connected to the external rotor (30). At least one of the external (30) and internal (20) rotors is disposed in a flux concentration.

Abstract: A brushless DC motor including a stator having plural slots; and a rotor which has plural permanent magnets and is divided into three rotor blocks in a rotation axis direction, the three rotor blocks being layered so that the arrangement angles of the rotor blocks differ from each other by an amount of a mechanical angle in a rotary direction that is equivalent to one third of a pulsation period of cogging torque generated by the rotor and stator. A brushless DC motor including a rotor having plural magnetic poles provided at an equal pitch in a circumferential direction by mounting permanent magnets in magnet mounting holes; and a stator having plural slots arranged at an equal pitch in a circumferential direction.

Abstract: A brushless DC motor including a stator having plural slots; and a rotor which has plural permanent magnets and is divided into three rotor blocks in a rotation axis direction, the three rotor blocks being layered so that the arrangement angles of the rotor blocks differ from each other by an amount of a mechanical angle in a rotary direction that is equivalent to one third of a pulsation period of cogging torque generated by the rotor and stator. A brushless DC motor including a rotor having plural magnetic poles provided at an equal pitch in a circumferential direction by mounting permanent magnets in magnet mounting holes; and a stator having plural slots arranged at an equal pitch in a circumferential direction.

Abstract: A motor includes a rotor with interior permanent magnets and a stator with teeth wound by concentrated windings. Each permanent magnet is split along a plane oriented towards the stator, and an electrically insulating section is set between the split magnet pieces. This structure allows each permanent magnet to be electrically split, thereby restraining the production of an eddy current. As a result, heat-production is dampened thereby preventing heat demagnetization of the permanent magnets.

Abstract: A rotor for an electric machine comprising a plurality of independent poles (58) having a triangular cross section shape and permanent magnets (56) having a trapezoidal cross section shape. The shapes of the independent poles and permanent magnets cooperate to improve the integrity of the lodgment of each permanent magnet.

Abstract: An electric synchronous machine with improved torque characteristic has a stator and a rotor, wherein the stator includes a winding, preferably a three-phase AC winding, with an average coil width &tgr;sp. The rotor is provided with permanent magnets and has a pole pair number of 2p with a pole pitch width &tgr;p, wherein the pitch ratio &tgr;sp/&tgr;p is ≧2.5.

Abstract: The invention concerns a rotating electric machine which includes a stator equipped with armature coils and a rotor mounted rotating inside the stator. The rotor having a series of magnets with alternating polarities juxtaposed with magnetic parts having magnetic resistance, respectively associated with the magnets. Each assembly of one magnet and one associated magnetic part defining a rotor pole wherein some of the poles have alternately, along a generally tangential direction, a magnet followed by its magnetic part and a magnet preceded by its magnetic part. The invention is applicable to motor vehicle alternators and AC starters.

Abstract: A rotor 33, 133 for use in an electrical machine 100 having permanent magnets 34, 134 included therein, each permanent magnet 34, 134 between an adjacent pair of poles 32, 132, wherein each adjacent pole 32, 132 has an opposite polarity. Each permanent magnet 34, 134 has a magnetization polarity on its radially-outward surface 38, 138, and each adjacent permanent magnet 34, 134 has the opposite polarity on its radially-outward surface 38, 138. In addition, each pair of permanent magnets 34, 134 have the same magnetic polarity on their adjacently facing surfaces. This arrangement of permanent magnets 34, 134 may be used on electrical machines 100 having either a Lundell-type rotor 33 or salient pole rotor 133. The arrangement of permanent magnets 34, 134 increases the output power and efficiency of the electrical machine 100 while decreasing magnetic noise.

Abstract: A rotor 33, 133 for use in an electrical machine 100 having permanent magnets 34, 134 included therein, each permanent magnet 34, 134 between an adjacent pair of poles 32, 132, wherein each adjacent pole 32, 132 has an opposite polarity. Each permanent magnet 34, 134 has a magnetization polarity on its radially-outward surface 38, 138, and each adjacent permanent magnet 34, 134 has the opposite polarity on its radially-outward surface 38, 138. In addition, each pair of permanent magnets 34, 134 have the same magnetic polarity on their adjacently facing surfaces. This arrangement of permanent magnets 34, 134 may be used on electrical machines 100 having either a Lundell-type rotor 33 or salient pole rotor 133. The arrangement of permanent magnets 34, 134 increases the output power and efficiency of the electrical machine 100 while decreasing magnetic noise.

Abstract: A motor includes a rotor with interior permanent magnets and a stator with teeth wound by concentrated windings. Each permanent magnet is split along a plane oriented towards the stator, and an electrically insulating section is set between the spilt magnet pieces. This structure allows each permanent magnet to be electrically split, thereby restraining the production of an eddy current. As a result, heat-production is dampened thereby preventing heat demagnetization of the permanent magnets.