Abstract: A stator assembly for an alternating current generator. The stator core is a one-piece molded part that is formed of iron powder having a particle size in a range of about 10 to 250 microns. The powder is bound together by a thermoplastic material which covers the particles and which serves to insulate the particles from each other. The particles may be coated with phosphorus and the phosphorus layer overcoated with the thermoplastic material. A three-phase output stator winding is carried by the core and has conductor portions located in core slots.

Abstract: A rotor assembly comprises a high energy product permanent magnet contained within a sheath and metallurgically bonded thereto. The metallurgical bond imparts mechanical strength to the magnet, thereby preventing crack propagation therewithin during operation of the rotor assembly, and minimizes the thermal barrier to the transfer of heat from the magnet to the sheath.

Abstract: A voice coil-type linear motor comprising an cylindrical outer yoke made of a ferromagnetic material; a cylindrical center yoke made of a ferromagnetic material and magnetically coupled with the outer yoke; an integral, cylindrical magnet consisting essentially of an R-B-Fe alloy wherein R is at least one of rare earth metals such as Nd, Pr and Dy and having magnetic anisotropy in a radial direction, the cylindrical magnet being fixed to an inner surface of the outer yoke; a protective member made of a nonmagnetic and conductive material and fixed to a surface of the cylindrical magnet; and a movable coil means arranged in a magnetic gap between the center yoke and the cylindrical magnet.

Abstract: A cylindrical permanent magnet of from 4-48 poles containing, as major components, R (R is at least one rare earth element selected from Nd, Pr, Dy, Ho and Tb and may further contain at least one rare earth element selected from La, Ce, Sm, Gd, Er, Eu, Tm, Yb and Y), B and Fe, and having multipolar anisotropy at the surface without suffering from cracking. The ratios of inner and outer magnet diameters are established as functions of the number of poles. Bushings of ferromagnetic materials allow for reduced permanent magnet thicknesses.

Abstract: The present invention relates to a brushless motor which utilizes part of the motor housing, which is formed by a plastic mixed with particles or fibers of a magnetic material, as a stator yoke.

Abstract: The present invention provides a large-thrust stepping motor improved in thrust constant by provision of slots at equal intervals between adjacent N and S poles of a permanent magnet disposed on a movable member of the motor or by division of the winding for each phase of a stator of the motor into two or more sections to pass currents independently through the divisional sections in accordance with the speed of the motor.Further, the invention provides a large-thrust stepping motor using a field magnet having large magnetomotive force, the field magnet being formed by combination of a magnet substrate and permanent magnets independent from the magnet substrate.

Abstract: A magnetic field generator comprises a permanent magnet, and pole pieces magnetically connected to the permanent magnet. The pole pieces are disposed to face each other to generate a magnetic field between them, and have a specific resistance of 20 .mu..OMEGA.-cm or more. The permanent magnet comprises a sintered alloy including iron as a main component, a rare earth element including yttrium, cobalt, and boron. The permanent magnet includes, as its main part, a strong magnetic Fe-rich phase of a tetragonal system, as well as a non-magnetic Laves phase, and preferably has a maximum energy product of 38 MGOe or more.

Abstract: An electromagnetic clutch of the type which includes a rotor secured around a rotation shaft, a drive member rotatably mounted around the rotation shaft, an armature mounted through a resilient member to the drive member with a gap to the rotor, a bearing mounted around the rotation shaft, a yoke mounted around the bearing for rotation about the rotation shaft, and the yoke locking mechanism for locking the yoke to a frame so as to prevent the yoke from accompanying the rotation shaft when the rotation shaft is rotated, the yoke having a coil wound therearound, and in which the rotor, the armature and the yoke are arranged to form a magnetic path so that the armature is electromagnetically attracted to the rotor for transmitting torque from the drive member to the rotation shaft when the coil is energized.

Abstract: A rotor for a techo-generator having an integral, massive disk that is toothed at the outer circumference. The width of the grooves between the teeth is larger than the width of the teeth so that the rotor windings may be wound in one plane without any baffle plates, deflecting plates or the like.

Abstract: A rotor of induction motor comprises a rotary shaft, a cylindrical rotor core fixedly secured on the rotary shaft, a conductive cover fixed on the outer circumferential surface of the rotor core, the conductive cover being formed of a composite material of magnetic material and electrically highly conductive material to have a circumferential permeability smaller than a radial permeability, and a magnetic skin made of a magnetic material and provided on the outer circumferential surface of the conductive cover, the magnetic skin having a circumferential permeability and an electrical conductivity which are set to be larger than the circumferential permeability and an electrical resistivity of the conductive cover, respectively, whereby a loss due to a spatial higher harmonics magnetic flux of higher order generated by a pulsating magnetic flux of slots in a stator of induction motor can be prevented.

Abstract: An annular core used in a so-called air axial gap motor includes a magnetic and structural gap along the axial direction. By using a compressed molded body of a mixture of a magnetic metal powder and an electrically insulating resin as major constituents, an annular molded body and a molded plate are prepared. The annular molded body has slots and teeth alternately formed along the circumferential direction. The molded plate closes the upper portions of the slots to constitute a fully closed slot structure.

Abstract: An internally cooled rotor for an acyclic generator is disclosed as having a ferromagnetic steel core to which is diffusion bonded a cylinder copper conductor in which is embedded a multiplicity of cooling tubes communicating with coolant passages formed in the core. The cooling tubes are implanted in a hot isostatic pressure process during which the copper cylinder is at least in part created by the densification of copper powder to a non-porous mass.

Abstract: A collector for electric machines, including a rotationally symmetrical sintered ceramic body and a plurality of radially disposed metallic segments which are separated from each other by one interspace each and which are bonded to the ceramic body via a eutectic intermediate layer. The segments are bonded to the ceramic body in accordance with the eutectic method by being surface-oxidized on their inside narrow side and radially pressed against the ceramic body with the totality being brought to the melting temperature corresponding to the metal/metal-oxide eutectic and subsequently being cooled down again. A preferred embodiment includes: copper segments on an Al.sub.2 O.sub.3 ceramic body.

Abstract: In an electric motor, for example as used in audio or video apparatus, the rotor comprises a disk-shaped carrier of synthetic resin in which coils are accommodated. In order to stimulate a uniform running of the motor the mass of the rotor is increased by manufacturing the carrier from a synthetic resin filled with a filler having a high specific mass.

Abstract: A permanent magnet type stepping motor wherein magnetic poles of a stator core consisting of a cylindrical yoke, a plurality of magnetic poles provided radially around the inside of the cylindrical yoke, and pole teeth formed on the tips of the magnetic poles are divided into two almost equal parts near the tips thereof so as to be isolated axially from each other, each of the pole teeth of the magnetic poles in each group is made to face one of pole teeth of two poles provided around the circumference of a rotor with a gap therebetween.

Abstract: A columnar solid body rotor for DC dynamo electric machines in which a cylindrical dust core, obtained by solidifying a finely powdered magnetic material with an insulating material such as a synthetic resin or the like is mounted on the rotor shaft and a closely wound winding is disposed on the outer periphery of the dust core. The volume-conversion permeability of the rotor is selected several times higher than the space permeability, thereby to increase the effective flux of the rotor.

Abstract: A dynamoelectric machine stator is formed of an amorphous metal yoke or back iron portion, consisting of either a spirally wound coil of amorphous metal ribbon or an edge-wound helix of such ribbon in which the respective turns are stacked together to define a cylinder, in combination with a plurality of separately formed amorphous metal teeth that are mounted at spaced intervals on the interior surface of the yoke to define a plurality of spaced winding-receiving slots that each extend axially between pairs of the teeth. The teeth are each secured in operating position on the yoke by being both bonded directly to it and by the supporting relationship established between the teeth and abutting slot liners, energizing windings and a cured insulating coating which is applied to the stator after the energizing winding is positioned in the stator winding slots.

Abstract: A rotary magnetic sensor for generating electrical signals corresponding to rotation of a shaft, which comprises a rotary disk or drum made of non-magnetic material, a magnet installed in the center of said disk or drum, a magnetic film applied on the disk or drum and connected to said magnet, a magnetic-film pattern formed in said magnetic film in which magnetic flux distribution is varied in the rotating direction of said rotary disk or drum, and a magnetic sensitive means disposed in the proximity of said magnetic-film pattern whereby electrical signals are generated in accordance with the rotation of said disk or drum.

Abstract: A method of making a metal core for alternating current applications by powder metallurgy is disclosed. Ferro-magnetic powder is pressed into a cross section of the core, with the thickness of the cross section approaching that below which the green density is no longer uniform throughout the volume of the part. Additional cross sections are pressed to meet the overall core thickness requirement when the sections are subsequently stacked. The sections are stacked in non contacting relationship and sintered. The sections are separated by an air gap or magnetic insulating medium.

Abstract: A rotor assembly for a stepping motor, in which a protecting member fixedly is mounted on a rotor shaft and including a hub portion extending coaxially with the rotor shaft, and at least one face portion radially outwardly extending from said hub portion, and a rotor magnet having an inner bore and an outer periphery formed by etching a magnetic body of an intermetallic compound is mounted on the protecting member.

Abstract: The invention relates to a linearly moving or rotated flat armature for motors and pulling magnets, comprising a carrier of plastics or of ceramics and a coil system placed on this carrier. The flat armature according to the invention has a carrier which contains 2 to 50% by weight of a mild magnetic substance distributed therein homogeneously.The flat armature according to the invention makes possible an increase of the efficiency of the motor or of the pulling magnet at identical dimensions.

Abstract: A can for use in a canned motor made of a soft magnetic metal plate. Said metal plate has the magnetically hard direction of the texture oriented to the circumferential direction of the can body. Said metal plate also has the magnetically easy direction of the texture oriented to the normal direction of the can body.

Abstract: A field assembly for a dynamoelectric machine, particularly for electric engine cranking motors. The field assembly is comprised of a one piece field frame member formed of a high density compacted atomized iron powder. The one piece frame has a generally tubular configuration and has radially inwardly extending pole portions and outer axially extending grooves radially aligned with the pole portions. The frame carries a plurality of field coils which respectively circumscribe the pole portions of the frame. A pole face plate engages each end of a respective pole portion of the frame and a part of each field coil is located between a face plate and an inner wall of the frame. The pole plates are fixed to the frame by parts extending therefrom which pass through openings formed in the frame that extend between the interior of the frame and the outer frame grooves. These parts are headed over in the area of the grooves to secure the pole plates to the frame.

Abstract: Annular magnets, primarily for motor stators, are centrifugally cast from particulate materials and synthetic plastic materials. Iron particles and ferrite particles stratified during the spin casting procedures so that the former provide an outer stratum that serves as a yoke in the permanently magnetized structure. The anisotropic ferrite particles are magnetically oriented during casting by a rotating center magnet with the aid of bucking magnets that also rotate and serve to confine the field of the center magnet to the cavity area. Apparatus for carrying out the process is disclosed and includes means for introducing the plastic and particulate materials to the mold cavity while the mold is rotating as well as mold arrangements that facilitate material introduction by the creation of reduced pressure conditions in the cavity during the rotation of the mold.