Abstract: A rotor for an electrical machine that comprises two parallel magnet wheels, each of which comprises axial teeth so that each tooth on a wheel is situated in the space existing between two consecutive teeth on the other wheel, and that comprises magnetic elements, each arranged between two adjacent teeth and partly received in a groove produced in each of the opposite lateral faces of the two adjacent teeth. In one embodiment, each of the two adjacent teeth comprises one groove at a maximum, which emerges at the base of the first tooth.

Abstract: Provided is a winding bobbin with a simple structure, which allows, even when a number of layers formed by winding a conductor is odd, a winding start-side lead wire and a winding end-side lead wire to be led out in the same direction while ensuring a desired outer diameter size of a rotor coil without loosening a tightly wound conductor. The winding bobbin (50) includes a first flange portion (51) and a second flange portion (52) on both sides of a cylindrical winding portion (49). The second flange portion (52) is provided with a second locking portion (58) for locking a winding end portion (45) of the conductor which is wound around the winding portion (49) in an odd number of layers.

Abstract: A component for an electric machine includes a spool having a main body portion provided with a first end portion that extends substantially uninterrupted to a second end portion through an intermediate portion. A plurality of mounting elements are provided on the first end portion. A star member is operatively connected to the spool. The star member includes a main body, a plurality of flap members that extend from the main body and collectively define a central opening, and a plurality of mounting members that extend into the central opening. The plurality of mounting members engage with corresponding ones of the plurality of mounting elements to detachably mount the star member to the first end portion of the spool.

Abstract: A Lundell motor apparatus controls a field current passed to a rotor field coil and an armature stator coil current to generate a required torque. When the field current is If, the armature current is Ia, a d-axis inductance is Ld, a q-axis inductance is Lq, a q-axis current as a q-axis component of the armature current is Iq, a d-axis current as a d-axis component of the armature current is Id, a field torque is Tf, a field flux is ?f, a reluctance torque is Tr, and a combined torque of the field torque and the reluctance torque is ?T, the d-axis current Id is passed to the stator coil within a phase angle range where the combined torque ?T becomes larger than the field torque Tf to generate reluctance torque Tr which is equal to (Ld?Lq)Id·Iq in addition to the field torque Tf.

Abstract: To provide a brushless AC generator for a vehicle, which is capable of improving a cooing performance for an excitation coil and increasing an output of electric power generation with a simple structure. An external fan 11 fixed to a shaft 10 outside the brackets 5 and 6 and an internal fan 34 fixed to a rotor assembled body 21 formed from a first rotor pole 22 and a second rotor pole 23 united into one body, the internal fan 34 having fan blade 34a provided in a valley part 22b between claw poles 22a of the first rotor pole 22, are provided. The external fan 11 and the internal fan 34 are used to generate an air flow for cooling a stator core 3, the rotor assembled body 21, an excitation core 31 and an excitation coil 33.

Abstract: A rotor for an electric machine having a number of poles includes a shaft that extends along a portion of an axis and defines an outer surface. A first core portion is formed as a single inseparable component and includes a first portion that extends from the outer surface to a first outside diameter to define a first thickness, and a second portion spaced axially from the first portion that includes a reduced back portion that extends from an inside diameter to the first outside diameter to define a second thickness that is less than the first thickness. A second core portion is connected to the first core portion and includes a second outside diameter that is substantially the same as the first outside diameter.

Abstract: A rotor of alternator has core layer units serially located along axial direction. Each unit has a field coil generating magnetic flux and two rotor cores receiving the flux on respective sides of the coil in axial direction. Each core has a first yoke portion located on inner side of the coil, a second yoke portion extending from the first yoke portion toward the outer side and magnetic poles extending from the second yoke portion in the axial direction. The poles of one core and the poles of the other core in each unit extend toward different axial sides and are alternately arranged in circumferential direction on the outer side of the coil. A ratio of the outer circumferential diameter of the first yoke portions to the rotational diameter of the poles is lower than 0.54.

Abstract: An electric machine includes a stator and a rotor configured to rotate about an axis of rotation in a direction of angular rotation. The rotor includes a first claw-pole segment and an opposing second claw-pole segment. The first claw-pole segment includes a plurality of fingers extending from an end ring. Each finger includes a distal end and a proximal end with the proximal end fixed to the end ring. Each finger also includes an interior side and an exterior side with the exterior side facing the stator. A leading side and a trailing side are defined on each finger by the direction of angular rotation. A chamfer is formed on the exterior trailing side of each finger at the proximal end of the finger.

Abstract: The claw-pole-rotor shaft has a front end with a radially larger-sized section, two knurled regions known as crimping regions, intended to be assembled with the claw-pole rotor by local deformation of the material of the claw-pole rotor, and a centring region for centring the claw-pole rotor, the crimping regions being positioned on each side of the centring region while the centring region projects radially with respect to the crimping regions of the shaft, these themselves projecting radially with respect to the section of larger radial size at the front end of the shaft. The claw-pole rotor is characterized in that it is equipped with such a shaft while the rotary electrical machine is characterized in that it is equipped with such a rotor.

Abstract: A rotor for an automotive alternator includes a rotary shaft, first and second magnetic pole cores each having a plurality of magnetic pole claws, a bobbin, a field coil, a plurality of permanent magnets, and a positioning mechanism. The magnetic pole claws of the first magnetic pole core are interleaved with those of the second magnetic pole core. The field coil is wound around the first and second magnetic pole cores via the bobbin. The permanent magnets are interposed between the first and second magnetic pole cores. The positioning mechanism, which is made up of at least one of the rotary shaft, the first and second magnetic pole cores, and the bobbin, functions to position the first and second magnetic pole cores in the circumferential direction of the rotary shaft with intervals between adjacent pairs of the magnetic pole claws of the first and second magnetic pole cores being even.

Abstract: An automotive generator that includes a Lundell rotor. First and second protruding portions are disposed so as to project from inner wall surfaces of portions of first and second yoke portions at root portions of first and second claw-shaped magnetic pole portions, and first and second recess portions are recessed into inner wall surfaces of portions of the first and second yoke portions that face the second and first protruding portions. In addition, a shape of a region in which the field coil is disposed is configured into a wave shape that has a cross-sectional shape in a plane that includes a central axis of the pole core that is approximately constant in a circumferential direction and that zigzags alternately in an axial direction at positions of each of the first and second claw-shaped magnetic pole portions.

Abstract: The invention relates to a five-phase electric generator (1), in particular for a motor vehicle, said generator comprising five electric branches (12) for five different phases, the latter being electrically connected at interconnection points (14). The electric angle (?) ranges between 25° and 36° at said interconnection points (14).

Abstract: A rotor assembly is disclosed for use with an alternator. The rotor assembly includes a bobbin assembly, a claw pole assembly having an integrated hub on which the bobbin assembly is positioned, a shaft that is received in the claw pole assembly, and a slipring assembly connected to the shaft. The bobbin assembly includes thin first and second end caps, a metal sleeve, a ring of inner tape, a field coil, and a ring of outer tape. The first and second end caps each have inner and outer flaps. The inner flaps are folded inwardly so that the end caps fit over the metal sleeve. The ring of inner tape is wrapped around the inner flaps of both end caps to adhere the first and second end caps to the metal sleeve. The field coil is wrapped around the inner ring of tape, inner end caps, and metal sleeve. The outer flaps on the end caps are inwardly folded around the field coil. The ring of outer tape is adhered to the folded outer flaps and the field coil.

Abstract: The vehicle alternator comprises a rotor. The rotor comprises a first pole core 12, a second pole core 14, a field coil 13, and holders 15 each containing a magnet 16 and disposed between a first claw 123 and a second claw 143. The holder 15 consists of the magnet 16 inserted in a tubular member X having an opening x1/openings x2, and is formed with the tubular member X deformed so as to close the opening x1/openings x2.

Abstract: A rotor for a vehicular alternating current generator has a relief space portion formed between axial holes of a pair of pole cores and a shaft for receiving therein a plastically deformed portion produced when the shaft is press-fitted in the axial holes of the pole cores. The relief space portion is located adjacent to a pair of closely contacting inner end faces of the pole cores so that the plastically deformed portion is let to move into a radially outward direction rather than further continuing movement in an axial direction within the relief space portion. The plastically deformed portion is thus prevented from entering between the inner end faces of the pole cores.

Abstract: Disclosed herein is an electric machine rotor. The rotor includes, a rotatable shaft, a plurality of pole segments attached to the shaft, and a plurality of magnets attached to the plurality of pole segments such that one of the plurality of magnets is positioned circumferentially between adjacent pole segments and each of the plurality of magnets has nonparallel circumferentially opposing sides.

Abstract: A rotor of a synchronous motor includes a rotating shaft, a plurality of segments, a plurality of permanent magnets, and a field coil. The segments are located radially outward of the rotating shaft and arranged in the circumferential direction of the rotating shaft at a predetermined pitch with spaces formed therebetween. Each of the segments has a recess making up a magnetic reluctance portion and an opposite pair of ends making up salient-pole portions. Each of the permanent magnets is disposed in one the spaces between the segments with a predetermined orientation of its N and S poles. The field coil is wound around the segments to extend in the circumferential direction of the rotating shaft through the recesses of the segments. The field coil creates, when energized with DC current, magnetic flux which magnetizes the pair of ends of each of the segments in opposite directions.

Abstract: A method for producing a claw-pole rotor, including: a step of mounting polar wheels on the shaft in such a way that each tooth of a polar wheel is located in the existing space between two consecutive teeth of the other polar wheel; a step of machining the lateral faces facing two adjacent teeth, whereby an axial groove is machined in each lateral face; and a step of mounting a magnetic element between two adjacent teeth such that the magnetic element is received in the axial grooves. The method is characterized in that the step of machining lateral faces is carried out before the step of mounting polar wheels on the shaft. The invention also relates to a rotor obtained by such a method.

Abstract: A method of manufacturing a rotor for a rotating electrical machine includes the steps of: preparing a first and a second pole core, a rotary shaft, and a field coil; press-fitting the rotary shaft into a through-hole of the first pole core so that the axes of the rotary shaft and the through-hole coincide with each other; mounting the field coil on one of the first and second pole cores; opposing the first and second pole cores to each other so that the axes of the through-holes thereof are in alignment with each other and contact surfaces thereof face each other with a maximum parallelism therebetween; press-fitting the second pole core onto the rotary shaft so that the contact surfaces of the first and second pole cores maximally contact with each other and the axis of the rotary shaft coincides with the axes of the through-holes of the pole cores.

Abstract: An alternator includes a stator assembly and a rotor assembly. The rotor assembly includes a rotor core having a first core portion and a second core portion. The rotor core is processed by cementation, so that the first core portion has carbon content that gradually decreases from the outer surface toward the central line of the rotor core till reaching a predetermined carbon content. The second core portion has carbon content lower than that of the first core portion. With these arrangements, the alternator can reduce turn-on speed and increase outputs. A method of manufacturing the non-homogenous rotor core of the alternator is also provided.

Abstract: In a rotor for a rotating electrical machine, a flange of an insulating bobbin is formed with a first hook portion and a second hook portion. The first hook portion directs a lead of a field coil both against the winding direction of the field coil and radially inward. The first hook portion has a first groove in which is hooked a proximal portion of the lead. The second hook portion directs the lead axially outward. The second hook portion has a second groove which has an open end on a radially inner periphery of the second hook portion, a closed end positioned radially outward of the open end, and a neck between the open and closed ends. The second hook portion has an intermediate portion of the lead hooked in the second groove between the neck and closed end of the second groove.

Abstract: Disclosed herein is an electric machine. The electric machine includes, a housing defining an internal volume, a stationary shaft fixedly attached to the housing, a stationary field coil attached to the shaft, a pole assembly rotatable about the shaft, and a pulley fixedly attached to the pole assembly being positioned externally of the internal volume.

Abstract: The Lundell motor apparatus includes a controller for controlling a field current passed to a field coil of a Lundell-type rotor of a motor and an armature current passed to a stator coil of the motor in order to generate a required torque. When the field current is If, the armature current is Ia, a d-axis inductance is Ld, a q-axis inductance is Lq, a q-axis current as a q-axis component of the armature current is Iq, a d-axis current as a d-axis component of the armature current is Id, a field torque is Tf, a field flux is ?f, a reluctance torque is Tr, and a combined torque of the field torque and the reluctance torque is ?T, the controller passes the d-axis current Id to the stator coil within a phase angle range in which the combined torque ?T become larger than the field torque Tf in order to generate the reluctance torque Tr which is equal to (Ld?Lq)Id·Iq in addition to the field torque Tf.

Abstract: It is designed for accumulator batteries charging and for electrical energy generating with rectified voltage for movable and unmovable vehicles and/or objects. It possesses two identical mirror-image disposed rotor 2 and 2a and excitation 3 and 3a sets and common stator 4 with three-phase stator winding 11 realized in two groups windings, dephasing on 60/q electrical degrees. Each winding 11 is switched on with own terminals and diodes to rectified block 26, build of group isolated 30 and group connected with chassis ground 31 diodes upset in two metal, ribbed, concentric situated inner 32 and outside 33 radiators pressed with their plane surfaces to rear end bell 7 of housing 5. Inner radiator 33 has ventilation holes 35. Advantage of alternator is increased output current at reduced input power and constant alternator volume and speed of rotation as well as increased applied time of alternator and its bearings.

Abstract: An alternating-current dynamoelectric machine according to the present invention includes: a stator including: a stator core in which slots that extend in an axial direction are formed on an inner side; and a stator winding that is mounted to the stator core by winding conducting wires into the slots; and a rotatable rotor including: a field winding that is disposed inside the stator; a rotor core constituted by a first pole core and a second pole core that each have claw-shaped magnetic poles that are disposed so as to cover the field winding and that alternately intermesh with each other; and first and second permanent magnets that are respectively disposed on two facing side surfaces of adjacent claw-shaped magnetic poles and that have magnetic fields that are oriented so as to reduce leakage of magnetic flux between the claw-shaped magnetic poles, and a magnetic body is disposed between a pair of the first and second permanent magnets.

Abstract: Provided is a brushless alternator for preventing water from penetrating further inside through a gap between a distal end portion of a spool and a concave portion of a bracket. According to the brushless alternator of the present invention, a rotor includes: a rotor main body; and a coil body (30) fixed to a rear bracket (21). The coil body (30) includes: a bobbin (32); a field coil (13); a yoke portion (10) of a second magnetic pole, the yoke portion (10) having one lateral surface being in close contact with a lateral surface of the bobbin (32) and another lateral surface being bonded to the rear bracket (21); a spool (31) provided on an inner circumferential surface of the yoke portion (10) and an inner circumferential surface of the bobbin (32); and a rubber bush (101) provided to a projecting portion (312) at a distal end of the spool (31).

Abstract: A device for generating electrical or mechanical output, comprising a stator coil, a stator assembly, a rotor coil, a rotor assembly rotational about an axis, the rotor assembly at least partially surrounding the rotor coil, rotator extensions capable of induced magnetization and extending from the rotator, each rotator extension having a rotor extension surface, wherein magnetic flux leakage between the rotator extension surfaces is prevented or reduced via permanent magnet elements located at the rotator extension surfaces. Stator and rotor may be reversed in operation.

Abstract: A vehicle A.C. generator has a rotor. The rotor has a pair of pole cores and magnet holders. Each pole core has a plurality of claw-like magnet poles. Each magnet holder contains a permanent magnet and placed between the adjacent claw-like magnet poles in order to prevent leakage flux. The rotor has a pair of supporting members in order to stop each magnet holder shifting in the direction of a rotary shaft of the rotor. Each supporting member has projecting parts which correspond to the magnet holders. The supporting members are fixed to one end surface of the pole cores, respectively. Each projecting part fixes the position of the corresponding permanent magnet in the rotor.

Abstract: An electrical machine comprises a rotor assembly comprising a first set and a second set of rotor extensions, and a stator assembly comprising a first set and a second set of stator extensions. Rotating the rotor assembly about an axis alternates the rotor assembly between a first position and a second position. In the first position, each of the first set of rotor extensions transfers flux to one of the first set of stator extensions, and each of the second set of rotor extensions transfers flux to one of the second set of stator extensions. In the second position, each of the first set of rotor extensions transfers flux to one of the second set of stator extensions, and each of the second set of rotor extensions transfers flux to one of the first set of stator extensions. The electrical machine is at least one of a transverse flux machine or a commutated flux machine.

Abstract: An interfitting groove is disposed in a bottom portion of a trough portion so as to have a groove direction that is axial and so as to extend axially outward from axially inside, and a rotation arresting portion housing recess portion is recessed into an axially inner opening edge portion of the interfitting groove on a first yoke portion. A magnet holding seat that holds a permanent magnet is disposed in the trough portion by an interfitting portion being fitted into the interfitting groove such that radial movement is restricted. A rotation arresting portion that is disposed so as to project axially outward from a flange portion of the bobbin is housed inside a space that is constituted by the rotation arresting portion housing recess portion and an external shape reduced portion that extends axially inward from the interfitting groove such that rotation of the bobbin around the shaft is restricted.

Abstract: A dynamoelectric machine including first and second permanent magnets held by first and second magnet seats on first and second yoke portions so as to face inner circumferential surfaces of tip end portions of first and second claw-shaped magnetic pole portions. The first and second permanent magnets are magnetically oriented in a reverse direction to orientation of a magnetic field that the field coil produces. The dynamoelectric machine enables permanent magnet holding reliability to be increased, induced voltage during no-load de-energization to be suppressed, and thermal demagnetization of magnets due to high-frequency magnetic fields that are induced by stator slots to be avoided.

Abstract: An electrical machine comprises a rotor assembly comprising a first set and a second set of rotor extensions, and a stator assembly comprising a first set and a second set of stator extensions. Rotating the rotor assembly about an axis alternates the rotor assembly between a first position and a second position. In the first position, each of the first set of rotor extensions transfers flux to one of the first set of stator extensions, and each of the second set of rotor extensions transfers flux to one of the second set of stator extensions. In the second position, each of the first set of rotor extensions transfers flux to one of the second set of stator extensions, and each of the second set of rotor extensions transfers flux to one of the first set of stator extensions. The electrical machine is at least one of a transverse flux machine or a commutated flux machine.

Abstract: A rotor (1) for a rotary electrical machine, which includes two pole wheels (2) having a series of axial claw poles (20) of a trapezoidal overall shape which extend axially from the extreme radial outer edge of the pole wheel (2a) toward the other pole wheel (2b), such that each pole claw (20a, 20b) of a pole wheel (2a, 2b) is situated in the space which exists between two consecutive claw poles (20a) of the other pole wheel (2b). The rotor (1) includes magnetic assemblies (3) in the interpole space (22). An assembly (3) is composed of at least one magnetic member (31) and at least one magnet (30), received in a groove (21) made in each of the facing edge faces of the two adjacent claw poles (20a, 20b). This has the advantage of increasing the cross-section for the flow of rotor flux towards the stator, and of enabling the same milling cutter as has already been used to make the grooves in the edge faces of the claw poles.

Abstract: An automotive alternator is disclosed which includes an annular core disposed to surround the radially outer peripheries of all magnetic pole claws of magnetic pole cores. The annular core has, on an outer surface thereof, a plurality of protrusions, a plurality of recesses, and a plurality of slopes. Each of the protrusions is so provided as to be coincident with a corresponding one of the magnetic pole claws of the magnetic pole cores in the circumferential direction of a rotary shaft. Each of the recesses is alternately formed with the protrusions so as to be coincident with a corresponding one of air gaps formed between the magnetic pole claws of the magnetic pole cores in the circumferential direction. Each of the slopes is inclined to the radial direction of the rotary shaft and connects a circumferentially adjacent pair of one of the protrusions and one of the recesses.

Abstract: The invention relates to a claw pole generator comprising a claw pole rotor, two magnet wheel halves (21, 23) which are mounted on a drive shaft (15) and are provided with claw-shaped magnet poles (22, 24) that mesh with each other, and an annular closing member (10) located between adjacent magnet poles (21, 23). The magnet wheel halves (21, 23) can be inserted into pockets (11) of the closing member (10) along with the magnet poles (22, 24) thereof such that the closing member (10) overlaps the magnet poles (22, 24) on the edge in at least some areas. Also disclosed is a closing member (10).

Abstract: A method of manufacturing a rotor for rotating electrical machines, notably an alternator, the rotor including two magnet wheels defining between them at least one interpole space arranged to receive at least one magnet. At least one angular indexing mark is produced on at least one of the magnet wheels. At least one groove partially delimiting the interpole space is formed, by machining, on the magnet wheel while maintaining the magnet wheel in an angular position dependent on the angular indexing mark.

Abstract: A device for generating electrical or mechanical output, comprising a rotor coil, a rotor assembly with an axis, and having rotator extensions, a stator coil, and a stator assembly, the stator assembly having two sets of stator flux conductor extensions, the rotator end of the stator flux conductor extension having a stator conductor surface and the interior ends of the first set of stator flux conductor extensions abutting the interior ends of the second stator flux conductor extensions at an abutting junction, wherein rotating the rotor assembly about the axis alternates the rotor assembly between a first and second position in which each of the rotor extension surfaces alternately face the stator conductor surfaces of the first and second set of stator flux conductor extensions. The first and second positions of the rotor assembly lead to the conduction of magnetic flux in the device in opposite paths in the stator assembly generating an output in an output coil.

Abstract: Each of first and second pole cores has a boss portion, six core flange portions; and six claw-shaped magnetic pole portions, the first and second pole cores being disposed such that the claw-shaped magnetic pole portions face each other so as to intermesh and leading end surfaces of the boss portions are abutted with each other. The boss portions include coil mount portions in which cross-sectional shapes that are perpendicular to the central axis are hexagons; and abutted portions that have circular cross sections and that are disposed so as to protrude from leading ends of the coil mount portions. Radially-inner surfaces of the claw-shaped magnetic pole portions face side surfaces of the coil mount portions and are parallel to the side surfaces of the coil mount portions at the cross sections that are perpendicular to the central axis.

Abstract: A magnet covering member made of a soft steel plate covers an outer surface of a magnetized permanent magnet placed in a rotor core of a rotor. The magnet covering member is detached from the permanent magnet when the rotor is incorporated into a stator of an alternator during an alternator assembling process. Because of a soft magnetic characteristic of the magnet covering member, an outer magnetic field generated by the permanent magnet placed between adjacent claw poles of the rotor core makes a magnetic short-circuit, and a magnetic attracting phenomenon caused by such a magnetic field is thereby reduced. The soft magnetic characteristic of the magnet covering member also serves to support the rotor.

Abstract: An alternating-current dynamoelectric machine according to the present invention includes: a stator including: a stator core in which slots that extend in an axial direction are formed on an inner side; and a stator winding that is mounted to the stator core by winding conducting wires into the slots; and a rotatable rotor including: a field winding that is disposed inside the stator; a rotor core constituted by a first pole core and a second pole core that each have claw-shaped magnetic poles that are disposed so as to cover the field winding and that alternately intermesh with each other; and first and second permanent magnets that are respectively disposed on two facing side surfaces of adjacent claw-shaped magnetic poles and that have magnetic fields that are oriented so as to reduce leakage of magnetic flux between the claw-shaped magnetic poles, and a magnetic body is disposed between a pair of the first and second permanent magnets.

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: Disclosed is a coil support for an electrical machine including a shank having a first outer diameter configured to support a field coil of the electrical machine and a base located at one end of the shank. The base has a second outer diameter greater than the first outer diameter and includes a plurality of recesses configured to increase a cooling flow through the electrical machine. Further disclosed is an electrical machine including the coil support and a method for cooling an electrical machine.

Abstract: Stator claw poles are disposed at a stator core at a position facing opposite a rotor so as to alternately range from the two sides along the axial direction. With a plurality of magnetic poles thus formed, the distance by which the gap between the front end portions of the stator claw poles and the stator outer circumference ranges is increased, which, in turn, reduces the reactance guided to a stator coil. It is ensured that the magnetic reluctance manifesting between the front end portions of the stator claw poles and an enclosing member that holds the stator core, facing opposite the centers of the claw poles along the circumferential direction, is greater than the magnetic reluctance manifesting between the front portions and the stator core enclosing member facing opposite the front end portions.

Abstract: An alternator has a rotor rotated on its own axis to generate electric power in a stator. The rotor has pole cores with claw portions arranged along the circumferential direction, and a holder unit is disposed between two adjacent claw portions in each pair. Each holder unit has a magnet accommodating holder and a magnet covering holder. Each holder has one bottom wall, four side walls and one opening. The magnet accommodating holder accommodates a magnet. The magnet covering holder is placed between the claw portions and accommodates the magnet accommodating holder while covering the magnet exposed to the opening of the magnet accommodating holder. The magnet accommodating holder has convex portions existing in the respective side and bottom walls and being in elastic contact with the magnet.

Abstract: A rotor core which has relatively high rigidity, can ensure sufficient magnetic performance, and can be produced at a cheaper cost with a relatively small-scale facility. A claw-equipped core and a yoke are manufactured separately. After fitting the yoke to a fitting portion formed in the claw-equipped core, a part of the claw-equipped core in the vicinity of the fitting portion is axially pressed to plastically flow into an annular groove formed in the yoke, thereby integrally joining the claw-equipped core and the yoke to each other. Thus, a large-scaled manufacturing facility is not required, and claws of the claw-equipped core are hard to open in the radial direction even under the action of a centrifugal force during high-speed rotation. A stator core and the claws of the claw-equipped core can be positioned closer to each other, and deterioration of magnetic performance can be avoided.

Abstract: An inductor-type synchronous machine having an axial gap structure, which has a shaft portion at the center thereof, the machine includes: a field-side stator which has a yoke made of a magnetic material and a field body protruding from the yoke in an axial direction of the shaft portion to form an N pole and an S pole in a radial direction; a rotor which has N pole inductors disposed so as to be opposed to the N pole formed by the field body and S pole inductors disposed so as to be opposed to the S pole formed by the field body; and an armature-side stator in which an armature coil is disposed so as to be opposed to the N pole inductors and the S pole inductors.

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: A dynamoelectric machine including first and second permanent magnets held by first and second magnet seats on first and second yoke portions so as to face inner circumferential surfaces of tip end portions of first and second claw-shaped magnetic pole portions. The first and second permanent magnets are magnetically oriented in a reverse direction to orientation of a magnetic field that the field coil produces. The dynamoelectric machine enables permanent magnet holding reliability to be increased, induced voltage during no-load de-energization to be suppressed, and thermal demagnetization of magnets due to high-frequency magnetic fields that are induced by stator slots to be avoided.

Abstract: It is an object of the present invention to make it possible to easily wind a stator winding, enhance an occupied ratio in a stator core, reduce a winding resistance because there is no coil end, and change a field magnetic flux in accordance with a use. Stator pawl magnetic poles of a stator core extend from both sides in an axial direction alternately at locations opposed to a rotor to form a plurality of magnetic poles. With this stator core, it is only necessary to annularly wind a stator winding. Therefore, it is possible to enhance operability and an occupied ratio, and since there is no coil end, it is possible to reduce winding resistance. Since the rotor is a Randall type rotor having a field winding and a rotor pawl magnetic pole, it is possible to change the field magnetic flux in accordance with a use.

Abstract: Disclosed herein is a brushless electric machine comprising, a housing, a stationary field coil, a shaft, a bearing, a pole segment, and a stator. The stator including a core having a plurality of core slots that extend between a first and a second end of the stator core. The stator also including a winding with a plurality of phases, each of the phases having at least one conductor having a plurality of substantially straight segments disposed in the core slots. The straight segments are alternately connected at the first and the second ends of the stator core by a plurality of end loop segments. A section of at least one of the conductors including three consecutive end loop segments and two straight segments, is formed from a single continuous conductor, and one of the core slots houses a plurality of the straight segments arranged in at least one radial row.