Abstract: Embodiments disclosed herein describe methods for improved permanent magnet motor rotor systems for submersible electric motors. The improved rotor system includes a single piece of material shaft with surface mounted permanent magnets. The single piece of material shaft minimizes the number of shaft bearings and locates the bearings outside of the stator windings.

Abstract: The present invention relates to a rotary micromotor (10) designed for actuating an abrasive blade (4) of a surgical or dental tool, the motor comprising a rotor (11) co-operating with a stator (12), and being characterized in that the rotor (11) has a hollow central tubular portion, and comprises an outwardly polarized Halbach array.

Abstract: A rotor includes a shaft, a rotor core including a pair of accommodation holes, and a pair of magnets accommodated in the pair of accommodation holes. The pair of magnets extend in directions away from each other in a circumferential direction from the radially inside toward the radially outside. A flux barrier is radially outside the magnet. The rotor core includes a first gap between magnetic poles adjacent to each other in the circumferential direction. The first gap is sandwiched between the flux barriers of the magnetic poles adjacent to each other in the circumferential direction. A radially outside surface of the rotor core includes a pair of core recesses provided in a portion located on the radially outside of the flux barrier and a core protrusion located between the pair of core recesses in the circumferential direction.

Abstract: A driving device for a washing machine includes: a shaft including an inner shaft and an outer shaft surrounding the inner shaft; a motor assembly including a stator, a rotor that surrounds the stator, a modulator that surrounds the rotor, and a magnetic gear rotating body that surrounds the modulator; a first fixation body that connects between the inner shaft and the magnetic gear rotating body; a second fixation body having one end connected to the stator and the other end connected to a tub; and an electronic clutch that disconnects the outer shat and the rotor or connects the inner shaft and the rotor according to an operation mode of the washing machine. The modulator adjusts a speed and torque of the magnetic gear rotating body. The driving device may make a motor drive area highly efficient and may reduce electric consumption.

Abstract: An embodiment of a linear electric machine includes two or more phases that define a central bore, and alternating permanent magnets that are disposed within the central bore and are free to move relative the windings. An embodiment of a method for selectively powering the windings is disclosed that enables the machine to realize a commanded force, or to determine the force present by using the current within the windings and the alignment of the magnets relative to the windings.

Abstract: An electrical machine (1) comprises a stator (20) and a rotor (10) having a plurality of poles (4). A pole comprises a radial axis (5) centrally through the pole. A pole comprises a first slot configuration (12, 13) having a magnet (15, 16) located centrally within the slot with the radial axis (5) passing through the magnet (15, 16) or the magnet being substantially perpendicular to the radial axis. A pole comprises a second slot configuration (11) having a pair of magnets (14-1, 14-2) located at spaced apart positions within the slot. The pair of magnets (14-1, 14-2) are located each side of the radial axis (5). The first slot configuration (12, 13) is located between the second slot configuration (11) and an outer perimeter (19) of the rotor (10).

Abstract: A permanent magnet rotor of an electric motor, includes a laminated core having magnet pockets, the laminated core being composed of two partial laminated cores. A plurality of permanent magnets are held in a force-fitting manner in magnet pockets of the laminated core, the magnets extending over both partial laminated cores. Sheet metal tongues, which maintain the force fit of the permanent magnets, are deflected in the first partial laminated core in a first axial direction and in the second partial laminated core in a second axial direction opposite to the first direction, wherein the partial laminated cores consist of stamped metal sheets and the permanent magnets are pressed into the magnet pockets in the stamping direction.

Abstract: A magnet module is disclosed. The magnet module includes a sintered magnet structure, a magnetic permeable casing and a fixing member. The sintered magnet structure is disposed in the magnetic permeable casing. The fixing member has a plurality of locking units, and the sintered magnet structure and the magnetic permeable casing are fixed by the locking units of the fixing member.

Abstract: A rotor of a motor apparatus may include: a shaft; a first core part including a first press-fit ring into which the shaft is press-fitted and a plurality of first cores arranged along the circumferential direction of the first press-fit ring so as to support magnets; a second core part including a plurality of second cores arranged along the circumferential direction of the shaft so as to face the first cores; and a third core arranged inside the second cores, and installed to support the first press-fit ring.

Abstract: A consequent-pole-type rotor including a rotor core and a permanent magnet 1 disposed inside the rotor core, includes a first rotor core having a first region into which the permanent magnet is inserted and a second rotor core that has a second region communicating with the first region and is stacked on the first rotor core, wherein a second width is larger than a first width, where the first width is a width of the first region in a radial direction of the rotor core and the second width is a width of the second region in the radial direction of the rotor core.

Abstract: A motor rotor and a manufacturing method therefor are disclosed. The motor rotor is disposed inside a stator so as to rotate by electromagnetically interacting with the stator, and includes: a rotor core formed by stacking a plurality of stack plates including first plate members and second plate members, and including a shaft hole, a plurality of rotor poles, and a plurality of magnet-embedded portions; and a plurality of permanent magnets inserted into the plurality of magnet-embedded portions.

Abstract: This interior magnet rotary electric machine (1) is provided with: a rotor (2) that has a rotor core (11) having permanent magnets (12, 13) embedded therein; a stator (3) that is disposed facing the rotor (2); and a fiber-reinforced plastic tube (4) that is fitted over and fixed to the rotor core (11).

Abstract: A rotor is provided for use in an electric motor. The rotor is rotatable about an axis. The rotor includes a core including a plurality of arcuately arranged pole segments arranged arcuately the axis. The rotor further includes a plurality of arcuately arranged magnets alternating with the pole segments, such that each of the magnets is at least in part interposed between a pair of adjacent pole segments. Still further, the rotor includes a support structure at least in part supporting the pole segments. The core further includes a plurality of bridges. Each of the bridges extends between and interconnects a corresponding one of the pole segments to the support structure. Each of the bridges includes a plurality of axially spaced apart bridge segments.

Abstract: A rotor is provided for use in an electric motor. The rotor is rotatable about an axis. The rotor includes a core including a plurality of arcuately arranged pole segments arranged arcuately the axis. The rotor further includes a plurality of arcuately arranged magnets alternating with the pole segments, such that each of the magnets is at least in part interposed between a pair of adjacent pole segments. Still further, the rotor includes a support structure at least in part supporting the pole segments. The core further includes a plurality of bridges. Each of the bridges extends between and interconnects a corresponding one of the pole segments to the support structure. Each of the bridges includes a plurality of axially spaced apart bridge segments.

Abstract: A rotor core includes: an annular part around a through hole; a plurality of fan-shaped magnetic pole pieces radially formed around the annular part; and a plurality of magnet holders radially formed between adjacent magnetic pole pieces, and a plurality of first magnetic flux blocking parts formed in respective areas between adjacent magnet holders. The magnet holder includes a second magnetic flux blocking part at an end of the magnetic holder toward the rotating shaft. The rotor core includes two magnetic paths formed between the first magnetic flux blocking part and the two second magnetic flux blocking parts adjacent to the first magnetic flux blocking part. The two magnetic paths branch in different directions toward the annular part from the end of the magnetic pole piece toward the rotating shaft.

Abstract: There is provided an electric machine, which is configured such that magnetic poles provided on a stator and a mover or rotor of the electric machine have an asymmetric shape, thus being capable of reducing a torque ripple.

Abstract: A sleeve for retaining magnets around a rotor of an electrical machine. The sleeve is cylindrical and hollow, having axial length and having radial thickness between its inner surface and outer surface. The sleeve defines a plurality of axially spaced, circumferentially extending grooves. Each groove has radial depth which is less than the radial thickness of the sleeve.

Abstract: A polyphase electric motor (1) of a motor vehicle which includes a rotor (6) and a stator (2, 5, 13) surrounding the rotor and including a plurality of stator windings (5) around stator teeth (4, 19) defined by notches (3) in a stator magnetic mass (2). According to the invention, the motor includes a device for determining an angular position (17) and/or the speed of rotation of the rotor, including a plurality of magnetic field sensors (18) which are stationary relative to the stator. The sensors are arranged in notches (3) and comprise large casing surfaces extending in planes that are tangential to the stator magnetic mass, such that the sensors detect only a radial component of the magnetic field inside the stator magnetic mass.

Abstract: The present invention relates to a spoke-type permanent magnet rotor (1) used in brushless direct current electric motors (16), forming the rotating part inside a stator (17) that forms the stationary part thereof and having an air gap (18) between the inner surface of the stator (17) and itself, comprising a cylindrical core (2) produced from ferro-magnetic laminations or ferromagnetic powder metal, a shaft (3) fixed to the core (2) and forming the rotational axis of the rotor (1), a hub (5) disposed at the center of the core (2) and having a shaft hole (4) that bears the shaft (3), more than one pole segment (6) disposed all around the hub (5), more than one magnet slot (7) arranged between the pole segments (6), more than one magnet (8) tangentially magnetized, placed in the magnet slots (7) and extending outwards in the radial direction, and two end rings (9) produced from non-magnetic materials such as aluminum and plastic and fixed on the front and rear planar surfaces of the core (2) by the injection m

Abstract: A rotor of a permanent magnet synchronous machine includes a rotor core structure. A first set of apertures are formed in a first radial layer of the rotor core structure having a first set of permanent magnets disposed therein forming respective poles. A second set of apertures formed in a second radial layer of the rotor core structure of each pole. A third set of apertures is formed in a third radial layer of the rotor core structure. A second set of permanent magnets is inserted within the third set of apertures. A plurality of bridges each extends across a respective side of each of the third set of apertures in the third radial layer. The plurality of bridges provides structural support of the rotor core structure when operating. The plurality of bridges are integrally formed as single-piece laminations.

Abstract: A permanent magnet electrical machine includes a stator having conductive windings wound thereon and one or more permanent magnets embedded in the stator. A magnetic keeper element is positioned on the stator so as to form a magnetic flux path with the permanent magnets, with the magnetic keeper element closing the magnetic flux path of the permanent magnets by providing a low reluctance flux path to magnetic flux generated by the permanent magnets. A vacuum pressure impregnation (VPI) process is performed on the stator to increase a thermal conductivity of the windings, with the VPI process including a curing step that is performed at a selected temperature. The magnetic keeper element sets an operating point of the permanent magnets to an internal flux density level above a demagnetization threshold associated with the selected temperature at which the curing step is performed.

Abstract: The aim is to propose an individual-segment rotor that is simple to construct and suitable for series production. Therefore, an individual-segment rotor having a plurality of laminated core segments (2) arranged in a star shape and a permanent magnet (1) between each pair of adjacent laminated core segments (2) is provided, whereby the laminated core segments and the permanent magnets are arranged in a hollow cylindrical assembly. The laminated core segments each have a plurality of individual sheets, which are rigidly connected to one another. The hollow cylindrical assembly has a groove on each of two outer edges, into which groove a ring (11) is inserted in order to fasten the assembly.

Abstract: A motor realizes mechanical field-weakening control by controlling the leakage magnetic flux from the rotor cores of the motor. The motor includes a stator, a rotor including rotor cores circumferentially spaced apart from one another inside the stator and permanent magnets disposed between the respective rotor cores which extend radially from the stator, and a magnetic flux adjustment unit including a ring-shaped main frame, magnetic substance portions extending from the main frame so as to be circumferentially spaced apart from one another and non-magnetic regions defined between the magnetic substance portions. The magnetic flux adjustment unit is rotatable to control the leakage magnetic flux from the rotor cores.

Abstract: A rotary electrical machine comprises a rotor including a plurality of poles and a plurality of windings (E0-E7) wound about the poles, a stator, and a compensation device configured to compensate the armature magnetic reaction of the stator. The compensation device comprises at least one permanent compensation magnet which is implanted in a pole(s) of the rotor. The magnet(s) is/are sized and placed in accord with the desired compensation effect desired.

Abstract: An electric motor has a wound stator and a permanent magnet rotor. The rotor includes a shaft, a hub fixed on the shaft, a plurality of rotor core segments and magnets fixed around the hub. The rotor core segment includes at least two rotor blocks inwardly extending from the innermost portion thereof. The hub includes a plurality of hub blocks equidistantly and outwardly extending from the outer surface thereof. The rotor blocks of each rotor core segment engage with at least one hub block to fix the rotor core segment to the hub. The number of rotor blocks is greater than the number of hub blocks.

Abstract: A rotor includes a shaft and a plurality of permanent magnets which are arranged around the shaft in a circumferential direction for permanent excitation. At least one of the permanent magnets is attached to the shaft by a material joint or formfit. A flux conducting device for conducting a magnetic flux of the permanent magnets has a plurality of separate soft-magnetic flux conducting elements, with each flux conducting element being mounted between two of the permanent magnets and fixed thereto so as to be indirectly held in place on the shaft. At least one of the flux conducting elements has at least one contact area sized to cover an outer edge of one of the permanent magnets in the radial direction.

Abstract: The invention relates to a laminated rotor structure for a permanent magnet synchronous machine wherein disks (1) of a ferromagnetic material constitute the body of the rotor. The body includes bars (3) of a damper winding that extend axially close to the surface (2) from one end thereof to the other, and a circle of permanent magnets (4) disposed in a V-shaped configuration inside the circle formed by the bars, in which permanent magnets the first ends (5) are disposed close to the outer perimeter of the rotor and the second ends (6) are disposed closer to the central axis of the rotor. According to the invention, two permanent magnets (4) constitute a pair of permanent magnets wherein the magnets are disposed at an angle (a) to each other so that their first ends (5) are disposed at a distance from each other and their second ends (6) in proximity to each other.

Abstract: A permanent magnet rotor comprising a rotor rim and a plurality of permanent magnet modules arranged on the outer or inner circumference of the rotor rim. The permanent magnet modules comprise a base adapted to be fixed to the rotor rim, one or more permanent magnets, and a central magnet support structure. The base and the central magnet support structure comprise a plurality of radial holes. The permanent magnet modules are adapted so that, when bolts are inserted in the radial holes to fix the central magnet support structure to the base, at least a portion of a first and a second surface of each permanent magnet remain substantially in conforming contact with a surface of the base and a surface of the central magnet support structure, respectively.

Abstract: A wind turbine rotary electric machine having a tubular body, in turn having a cylindrical wall; and a plurality of clips formed integrally with the cylindrical wall and configured so that each pair of facing clips defines a seat for housing an active sector.

Abstract: Apparatus and associated methods involve thrust generation by interaction of an armature field with a stator field in an arrangement with substantially reduced flux coupling from the armature to the stator coil. In an illustrative example, solenoid coil segments may be arranged as the stator along a path of motion for the armature. In some examples, each armature may surround and overlap with at least one of the toroidal coil segments. Counter-electromotive force may be substantially reduced, for example, by stopping current flow in a stator coil while overlapped by the armature or while substantial armature flux couples to the stator coil. Thrust may be generated, in some examples, by interaction of armature and stator coil flux in arc-shaped regions external to and between each of the leading and trailing edges of the armature and their respective nearby stator coils.

Abstract: Provided is a rotary electric machine, including: a stator; and a rotor provided on the stator so as to be rotatable about a rotation shaft, in which the rotor includes, at an outer circumference thereof, magnetic poles arranged so as to have different polarities alternately, the magnetic poles being formed of a rotor core in which electromagnetic steel plates are stacked, the magnetic poles being excited by permanent magnets which are housed in gaps disposed at an outer circumferential part of the rotor core, and in which the rotor core includes, at an inner circumferential part thereof, in the same stack plane: a short circuit magnetic path connecting magnetic pole pieces which form the magnetic poles; and a protruding portion held in contact with the permanent magnets, which is positioned between magnetic pole pieces which are not connected to the short circuit magnetic path.

Abstract: A rotor and a rotary electric machine containing the rotor are provided. The rotor includes a shaft, a rotor core coaxially connected to the shaft, a first axial magnetic steel and a second axial magnetic steel disposed at an end surface of the rotor core, a rotor bushing, and a first magnetic isolation groove. The first axial magnetic steel has a first magnetic pole facing the rotor core. The second axial magnetic steel has a second magnetic pole facing the rotor core. The rotor bushing is disposed at a side of the first and second axial magnetic steels opposite to the rotor core. The first magnetic isolation groove is formed in the rotor core along a radius direction of the rotor core. The first magnetic isolation groove is disposed between the first axial magnetic steel and the second axial magnetic steel to isolate the first pole and the second pole.

Abstract: The brushless DC motor of the present invention comprises a permanent magnet rotor rotating coaxially with and inside of the stator containing the electric windings, separated by a radial, axially extending gap. The rotor can be formed of four or more permanent, e.g., ferrite ceramic magnets, spaced substantially equidistantly circumferentially around the rotor and extending radially along the axial length of the rotor. The preferred ferrite magnets are substantially corrosion resistant, and thus durable in the wet rotor environment, in which it may be used, sufficient to withstand the effects of even hot salt water. Preferably, four of the permanent magnets are bar magnets, i.e., rectangular in cross-section, extending radially and perpendicularly to the adjacent magnets. Most preferably, the bar magnets are separated by generally wedge-shaped, or quadrant-shaped, sections of magnetic material.

Abstract: An AC electric motor includes an annular A-phase winding WA wound in the circumferential direction of a stator, a stator pole group SPGA configured to generate magnetic flux ?A to interlink with the A-phase winding WA, an annular B-phase winding WB wound in the circumferential direction, and a stator pole group SPGB configured to generate magnetic flux ?B to interlink with the B-phase winding WB. The motor additionally includes a third stator pole group SPGC, N and S magnetic poles of the rotor, and X magnetic poles, which serve as third rotor poles, showing magnetic characteristics between the N and S magnetic poles of the rotor. DC currents are supplied to the A-phase and B-phase windings WA and WB to generate rotational torque.

Abstract: A stator and a rotor are oppositely arranged having a gap between the stator and the rotor in a direction parallel to a rotary shaft. The rotor has permanent magnets forming field magnetic poles and soft magnetic material segments to cover at least stator-facing surfaces of the respective permanent magnets. Each of the soft magnetic materials forms a composite part together with the permanent magnet. The rotor further has a disc-shaped nonmagnetic molded frame molded so as to cover the periphery of the composite part including the permanent magnet and the soft magnetic material segment while leaving a stator-facing surface of the soft magnetic material segment as an exposed surface. The composite part (including the permanent magnet and the soft magnetic material) and the nonmagnetic molded frame are integrated by molding of the molded material.

Abstract: An electrical, rotary machine may include a first stator core section being substantially circular and including a plurality of teeth, a second stator core section being substantially circular and including a plurality of teeth, a coil arranged between the first and second circular stator core sections, and a rotor including a plurality of permanent magnets. The first stator core section, the second stator core section, the coil and the rotor are encircling a common geometric axis, and the plurality of teeth of the first stator core section and the second stator core section are arranged to protrude towards the rotor. Additionally the teeth of the second stator core section are circumferentially displaced in relation to the teeth of the first stator core section, and the permanent magnets in the rotor are separated in the circumferential direction from each other by axially extending pole sections made from soft magnetic material.

Abstract: The invention relates to an electric machine excited by a permanent magnet. The electric machine comprises a rotor arrangement having buried permanent magnets and a stator arrangement having an inner recess for rotationally movably receiving the rotor arrangement, the rotor arrangement comprising a plurality of rotor segments, each having a pole shoe, the outer contour thereof corresponding to an arc contour having a contour radius, the contour radius being smaller than the radius of the rotor arrangement, thus forming a gap between two adjacent rotor segments, the at least one outer contour of one of the rotor segments having an arc contour, wherein the dimensions of the contour are optimized with regard to the distortion factor of the course of the flux density distribution of the pole shoe.

Abstract: A rotor comprises a rotor core, a plurality of magnetic poles arranged in a circumferential direction of the rotor core, a plurality of salient poles and a plurality of auxiliary magnets each of which is disposed between the magnetic pole and the salient pole is provided. Each magnet pole has a field magnet pole that serves as a first magnetic pole, wherein the field magnet is a main magnet. Each salient pole is integrally formed with the rotor core between the two adjacent magnetic poles. Each salient pole serves as a second magnetic pole. The pole of the second magnetic pole is opposite from that of the first magnetic pole. The auxiliary magnet generates magnetic flux in a circumferential direction of the rotor core so that the magnetic pole and an opposing pole of the auxiliary magnet have the same polarity and the salient pole and another opposing pole of the auxiliary magnet have the same polarity.

Abstract: A permanent magnet machine is provided including a stator and a rotor, the rotor being adapted to rotate relative to the stator, the rotor including a plurality of permanent magnets separated in the circumferential direction from each other by radially extending rotor pole pieces for concentrating the magnetic flux from the permanent magnets, the stator having a structure that defines radial limits of an air gap between the stator and the rotor for communicating magnetic flux between the stator and the rotor, wherein at least some of the permanent magnets extend radially outside the radial limits of the air gap as defined by the stator structure.

Abstract: A retention system in which rotor pole pieces are retained within complementarily shaped channels in a rotor hub, permanent magnets are secured between the pole pieces and within clamp members, and wedge-shaped pieces are used to apply positive locking forces along the axial length of each clamp member and of adjacent pole pieces. A curable resin preferably in disposed within gaps between the permanent magnets and the clamp members.

Abstract: Permanent-magnet (PM) rotors, rotor components, and machines using PM rotors.

Abstract: An electrical rotary machine is provided comprising a first stator core section being substantially circular and including a plurality of teeth, a second stator core section being substantially circular and including a plurality of teeth, a coil arranged between the first and second circular stator core sections, and a rotor including a plurality of permanent magnets. The first stator core section, the second stator core section, the coil and the rotor are encircling a common geometric axis, and the plurality of teeth of the first stator core section and the second stator core section are arranged to protrude towards the rotor. Additionally, the teeth of the second stator core section are circumferentially displaced in relation to the teeth of the first stator core section, and the permanent magnets in the rotor are separated in the circumferential direction from each other by axially extending pole sections made from soft magnetic material.

Abstract: A permanent magnet machine is provided comprising a stator and a rotor, the rotor being adapted to rotate relative to the stator, the rotor comprising a plurality of permanent magnets separated in the circumferential direction from each other by axially extending rotor pole pieces for concentrating the magnetic flux from the permanent magnets, the stator having a structure that defines axial limits of an air gap between the stator and the rotor for communicating magnetic flux between the stator and the rotor, wherein that at least some of the permanent magnets extend axially outside the axial limits of the air gap as defined by the stator structure.

Abstract: Embodiments of the invention provide for conical magnets for rotors in electrodynamic machines, methods to design the same, and rotor-stator structures for electrodynamic machines. In various embodiments, a rotor-stator structure for electrodynamic machine can include field pole members and conical magnets. According to at least some embodiments, one or more of the conical magnets can include a magnetic region configured to confront one or more air gaps. The magnetic region can be substantially coextensive with one or more acute angles to the axis of rotation. The magnetic region can also include a surface positioned at multiple radial distances from the axis of rotation in a plane perpendicular to the axis of rotation.

Abstract: A magnet pole portion 31 is made up of an integral magnet 44 into which are integrated a main permanent magnet piece 41 which is magnetized in the direction of a rotational axis, a pair of auxiliary permanent magnet pieces 42, 42 which are disposed at circumferential sides on one side of the main permanent magnet piece 41 with respect to the direction of the rotational axis, which are each magnetized in the direction of the rotational axis and a direction which is at right angles to a radial direction and on which magnetic poles face each other which are the same as a magnetic pole on the one side of the main permanent magnet piece 41 with respect to the direction of the rotational axis, and a pair of auxiliary magnet pieces 43, 43 which are disposed at circumferential sides on the other side of the main permanent magnet piece 41 with respect to the direction of the rotational axis, which are each magnetized in the direction of the rotational axis and a direction which is at right angles to a radial direction

Abstract: There is provided an axial gap motor including a rotor rotatable around a rotation axis; and a first stator and a second stator arranged to face each other with the rotor therebetween from both sides of the rotor in the rotation axis direction of the rotor, wherein the rotor includes a plurality of main permanent magnets having magnetizing directions in the rotation axis direction of the rotor and arranged in a peripheral direction of the rotor; a partition member arranged between the main permanent magnets which are adjacent to each other in the peripheral direction of the rotor, the partition member including a nonmagnetic material; and auxiliary permanent magnets having a magnetizing direction that is orthogonal both to the rotation axis direction of the rotor and a radial direction of the rotor, and arranged on both sides of the partition member in the rotation axis direction of the rotor.

Abstract: The rotor 11 of an axial gap type motor 10 is provided with a plurality of main magnets 41 respectively magnetized in an axial direction of a rotational axis and disposed at predetermined intervals in a peripheral direction, a plurality of yokes 42 structured by a laminated member 71 produced by winding a tape-shaped electromagnetic steel plate 60 and respectively disposed on both sides of the main magnets 41 in the axial direction, and a rotor frame 30 made of a die-cast alloy and including a plurality of ribs 31 respectively interposed between the main magnets 41 adjoining each other in the peripheral direction and extending in the radial direction, and an inner cylindrical portion 32 and an outer cylindrical portion 33 respectively formed on the radially inner side of the ribs 31 and on the radially outer side of the ribs 31.

Abstract: A motor is disclosed that includes a rotor having a consequent-pole structure. The rotor core of the rotor includes a magnetic flux dividing portion at each position that faces one of the magnets. Each magnetic flux dividing portion forcibly divides magnetic flux in the vicinity of the backside of the corresponding magnet to both sides in the circumferential direction.

Abstract: A rotor surface has magnetic salient poles and island-shaped magnetic poles alternately in circumferential direction, and the island-shaped magnetic pole is constituted so that a magnetic flux coming from an external source does not flow through. A magnetic excitation part magnetizes the island-shaped magnetic poles and the magnetic salient poles collectively in the same direction, and then control a flux amount flowing through an armature. The armature has armature coils that face the magnetic salient pole and the island-shaped magnetic pole simultaneously so that driving torque fluctuation or power generation voltage waveform distortion is controlled. The magnetic excitation part changes magnetization state of a field magnet irreversibly, or changes an excitation current to an excitation coil to control a flux flowing through the armature.

Abstract: A method for making and magnetizing an un-magnetized mechanically keyed permanent magnet rotor that can be magnetized in a magnetization fixture, without regard to the angular position of the rotor in the magnetizing fixture, and nevertheless result in a permanent magnetic field angularly synchronized to said keyed rotor comprises the steps of providing an annular permanent magnet or annular permanent magnet rotor body; a mechanically keyed rotor shaft; means for aligning and assembling the un-magnetized permanent magnet or permanent magnet rotor body and the mechanically keyed rotor shaft during assembly to form an assembled rotor; and magnetization thereof.