Abstract: A radial gap type rotating electrical machine includes a field and an armature. The field includes a permanent magnet and a magnetic ring which serves as a back yoke of the permanent magnet. The magnetic ring is provided at a position farther from the armature than the permanent magnet, and includes a recess at a magnetic pole center. The magnetic pole center is a center of a magnetic pole in a circumferential direction with respect to a rotation axis. A thickness of the recess in the radial direction around the rotation axis as a center comes to locally thin.

Abstract: A DC electric rotating machine mainly for the starter of an automotive vehicle, including: a stator having a magnetized structure with permanent magnetization and extending along the circumference of the stator; a rotor; a set of brushes adapted for the electric supply of the rotor by switching the electrical current in sections of the rotor; wherein the magnetized structure (5) of the stator includes at least one sector, between two consecutive magnetic poles (N; S) of the magnetized structure, having a magnetization vector that varies in an essentially sinusoidal manner upon displacement on the stator circumference, and wherein the angular deviation of the neutral line is selected so as to improve the switching during the operation of the machine.

Abstract: A flux machine includes a stator and a rotor. A set of electrical coil assemblies with side surfaces and sets of plural permanent magnets are arranged circularly on the stator and the rotor. Pole faces of the magnets are positioned adjacent to and spaced apart from side surfaces of permeable cores of the coil assemblies. In each coil assembly a pair of like pole faces of the magnets mutually face across the permeable core and a third magnet pole face faces transversely relative to the mutually facing pole faces of the pair of magnets.

Abstract: A direct-current rotating electrical machine, in particular for a motor vehicle starter. The machine includes a stator comprising a magnetized structure with permanent magnetization, extending along a circumference of the stator, a rotor, and a group of brushes arranged to allow the electrical supply of the rotor by switching the electrical current in sections of the rotor. The magnetized structure of the machine includes a plurality of main magnets and a plurality of auxiliary magnets, each arranged between two main magnets. The auxiliary magnets have a smaller angular extent and/or radial thickness than the main magnets. The magnetization vector in at least one of the main and auxiliary magnets varies continuously or in steps, at least locally taking a direction other than radial and orthoradial directions.

Abstract: Rotor formed by groups of materials (4) that orientate the magnetic field and magnets (2) in spiral lines, with the two magnetic poles of each magnet (2) facing the stator (3). Close to a magnetic pole of the end of the group, the material (4) that orientates the magnetic field protrudes towards the stator (3). This configuration enables to vary the field of each magnetic pole of the rotor which is projected to the stator; in this way, one end of the group of magnets (2) concentrates a very close magnetic pole in order to interact with the stator (3) and the opposite magnetic pole moves away gradually in order to decrease the interaction with the stator (3). The application is for magnetic motors.

Abstract: A magnetic levitation motor includes a fastening unit and a moving unit. The fastening unit includes a fixing frame and a first magnet assembly. The fixing frame includes a lower plate and four guiding poles extending upward from corners of the lower plate. The first magnet assembly includes four first magnets supported on the lower plate. Each first magnet is positioned between two adjacent guiding poles. The moving unit includes a moving frame and a second magnet assembly. The moving frame includes an outer surface and defines a receiving recess on the outer surface. The second magnet assembly includes four second magnets received in the receiving recess. The first magnets are positioned above the second magnets along an optical axis of the magnetic levitation motor.

Abstract: A method for preparing the magnet includes the steps of: (a) providing a sintered Nd base magnet block having surfaces and a magnetization direction, (b) coating the surfaces of the magnet block excluding the surface perpendicular to the magnetization direction with a Dy or Tb oxide powder, a Dy or Tb fluoride powder, or a Dy or Tb-containing alloy powder, (c) treating the coated block at a high temperature for causing Dy or Tb to diffuse into the block, and (d) cutting the block in a plane perpendicular to the magnetization direction into a magnet segment having a coercive force distribution on the cut section that the coercive force is high at the periphery and lower toward the inside and a constant coercive force distribution in the magnetization direction.

Abstract: An electropermanent magnet-based motor includes a stator having at least one electropermanent magnet, at least one coil around the electropermanent magnet configured to pass current pulses that affect the magnetization of the magnet, and a rotor that is movable with respect to the stator in response to changes in the magnetization of the electropermanent magnet. A wobble motor has a stator with a centrally-located core from which arms radiate outward, an electropermanent magnet and coil on each arm, and a rotor exterior to the stator such that the rotor can rotate around the stator arms. A rotary motor has a centrally-located rotor that rotates about its axis and a stator exterior to the rotor such that the rotor may rotate within the stator arms, the stator including an anteriorly-located stator core from which stator arms radiate inward toward the rotor, and an electropermanent magnet and coil on each stator arm.

Abstract: A DC motor comprises: a tubular metal case; a magnet that is provided along the inner surface of the metal case and has four or more of magnet poles in the circumferential direction; an armature that is arranged to face the magnet and composed of a core and a coil; and a shaft. The magnet is formed of a material with a maximum energy product BHmax of 3 to 6 MGOe. When the thickness of the magnet in the radial direction of the armature is indicated by T [mm] and the outer diameter of the core is indicated by d [mm], the ratio T/d of the thickness T of the magnet to the outer diameter d of the core is 0.16 or more.

Abstract: An electric machine includes a stator and an armature which together bound an air gap via which the stator interacts with a magnetic field of a magnetically active part of the armature. The armature includes as the magnetically active part permanent magnets and magnetically soft flux conducting elements which are arranged between the permanent magnets. The magnetically active part of the armature is in at least one direction of extent longer than a magnetically soft flux conducting device of a magnetically active part of the stator in the direction of extent.

Abstract: A rotating electric machine comprising a rotor (2) comprising a body (34) on the periphery of which are installed conductors (36) forming the winding, and a stator (3) positioned around the rotor (2) comprising a magnetized structure extending along a circumference of the stator (3). The body (34) of the rotor (2) is made partially of plastic, in the region of the teeth which conventionally separate the notches near the air gap, on the periphery of the armature. A modified structure of magnets of Halbach type is made with magnets of NdFeB type to reduce the thickness of the stator (3), to increase the radius (R2) of the rotor (2) so as to position all the conductors (36) on the periphery of the body (34) of the rotor (2) on one and the same layer at a diameter of maximum value.

Abstract: A periodic magnetic field generation device is provided with a field pole of a Halbach array structure in which main pole permanent magnets magnetized in a direction of a generated field and sub pole permanent magnets magnetized in a direction opposite to the direction of magnetic poles of the main pole permanent magnets are alternately disposed linearly or circularly so as to be adjacent to each other. A part of each of the main pole permanent magnets on a side on which the magnetic field is generated is replaced by a soft magnetic member, and a relation between a length A of the soft magnetic member on the side of the generated field along a moving direction and a length B of each main pole permanent magnet on a side of a back yoke along the moving direction is A<B.

Abstract: A lithographic apparatus includes an actuator for producing a force in a first direction between a first and a second part including a first magnet assembly and a second magnet assembly each attached opposite to each other to the first part of the apparatus, the first magnet assembly including a first main magnet system and a first subsidiary magnet system, and the second magnet assembly including a second main magnet system and a second subsidiary magnet system, the first and second main magnet system defining a space between them in a second direction perpendicular to the first direction. The actuator includes a coil attached to the second part. The distance between at least a part of the first subsidiary magnet system and at least a part of the second subsidiary magnet system is smaller than the minimum distance between the first main magnet system and the second main magnet system.

Abstract: A permanent magnet motor has a rotor and a stator. The rotor has a shaft, a rotor core fixed to the shaft, a commutator fixed to the shaft adjacent to the rotor core, and rotor windings wound about poles of the rotor core and electrically connected to the commutator. The stator includes a magnetically conductive round housing, permanent magnets fixed to an inner surface of the housing, and brushes for making sliding contact with the commutator. The ratio of an outer diameter of the rotor core to an outer diameter of the housing is between 66% to 84%.

Abstract: A flux-focused, shaped permanent magnet includes a body of magnetic material having multiple surface contouring to form a reduced flux side with convex surfaces and an increased flux side with concave surfaces. The surfaces develop high and low resistance external flux paths creating focused asymmetric flux fields. A magnetic unit having the shaped permanent magnet and a magnetic flux attracter or two shaped permanent magnets interconnected by two segmented permanent magnets and a kinetic device having a stationary stator ring, a rotor disc rotating within the stator ring and a multiplicity of the magnetic units on the stator ring and the rotor disc, are also provided.

Abstract: A permanent magnet for use in an electro-dynamic machine. The permanent magnet has a longitudinal axis and a plurality of ferromagnetic ring members arranged in a co-axial stack. Each ring member has a plurality of arcuate magnetic poles arranged around a circumference of the ring members. The ring members are magnetized such that a pole boundary between each pair of magnetic poles is skewed at an angle ?, where ? is non-parallel to the longitudinal axis.

Abstract: An anisotropic bonded magnet molded in a ring shape to be used to excite a brush-equipped direct current motor. A magnetic flux density distribution in each of magnetic pole sections of the ring shape forms an asymmetric distribution which includes a magnetic flux density reduced portion wherein the absolute value rises from a neutral axis opposite to a rotation direction of an armature with a delay with respect to a rotation direction of the armature, and in which the absolute value falls more rapidly than a rise thereof in the rotation direction of the armature with respect to a neutral axis in the rotation direction of the armature.

Abstract: An electric machine has a stator and a rotor. The stator has a housing and at least one pair of magnetic poles. Each magnetic pole has a primary magnet and two auxiliary magnets disposed on respective sides of the primary magnet. All of the magnets are disposed on an inner surface of the housing. All the magnets of a magnetic pole have the same polarity.

Abstract: A direct-current rotating electrical machine, in particular for a motor vehicle starter. The machine includes a stator comprising a magnetized structure with permanent magnetization, extending along a circumference of the stator, a rotor, and a group of brushes arranged to allow the electrical supply of the rotor by switching the electrical current in sections of the rotor. The magnetized structure of the machine includes a plurality of main magnets and a plurality of auxiliary magnets, each arranged between two main magnets. The auxiliary magnets have a smaller angular extent and/or radial thickness than the main magnets. The magnetization vector in at least one of the main and auxiliary magnets varies continuously or in steps, at least locally taking a direction other than radial and orthoradial directions.

Abstract: An anisotropic permanent magnet motor includes a stator and a rotor opposed to teeth of the stator with a gap therebetween, and the rotor includes an anisotropic permanent magnet disposed on a surface of a rotor yoke. The anisotropic permanent magnet has an orientation direction set in a direction normal to the outer-peripheral surface in a range of both ?r°/2 from a magnetic pole center and continuously inclined toward a magnetic pole end with respect to a direction normal to the outer-peripheral surface.

Abstract: Described is a direct current motor (1) with permanent magnet stator, having at least four stator poles (5, 6, 7, 8) which are spaced at equal angular intervals about the rotation axis (A) of the rotor (3) and which generate a magnetic field that is asymmetrical about the rotation axis (A) of the rotor (3) and where the rotor winding (4) can be powered partially and selectively at least at two fixed, explementary angular sectors.

Abstract: An electropermanent magnet-based motor includes a stator having at least one electropermanent magnet, at least one coil around the electropermanent magnet configured to pass current pulses that affect the magnetization of the magnet, and a rotor that is movable with respect to the stator in response to changes in the magnetization of the electropermanent magnet. A wobble motor has a stator with a centrally-located core from which arms radiate outward, an electropermanent magnet and coil on each arm, and a rotor exterior to the stator such that the rotor can rotate around the stator arms. A rotary motor has a centrally-located rotor that rotates about its axis and a stator exterior to the rotor such that the rotor may rotate within the stator arms, the stator including an anteriorly-located stator core from which stator arms radiate inward toward the rotor, and an electropermanent magnet and coil on each stator arm.

Abstract: In a compact motor 1 comprising a cylindrical permanent magnet 13, which is affixed to the inner surface of a hollow cylindrical yoke 12, and an armature core 22, which is provided at the interior of the permanent magnet 13, the armature core 22 comprises three slots 29 disposed at a uniform pitch, the permanent magnet 13 is bipolar-magnetized, and each magnetic pole has a maximum magnetic flux density value P in a range of 40° to 50° from the center at both sides of the magnetic pole, the maximum value P being within the range of 1.3 times to 1.8 times the magnetic flux density at the center of the magnetic pole.

Abstract: A DC electric rotating machine mainly for the starter of an automotive vehicle, including: a stator having a magnetised structure with permanent magnetisation and extending along the circumference of the stator; a rotor; a set of brushes adapted for the electric supply of the rotor by switching the electrical current in sections of the rotor; wherein the magnetised structure (5) of the stator includes at least one sector, between two consecutive magnetic poles (N; S) of the magnetised structure, having a magnetisation vector that varies in an essentially sinusoidal manner upon displacement on the stator circumference, and wherein the angular deviation of the neutral line is selected so as to improve the switching during the operation of the machine.

Abstract: An electric motor for a small-scale electrical appliance, such as a toothbrush or shaver. The electric motor includes at least one oscillatory motor component, a magnet arrangement having at least one permanent magnet, and a coil for generating a magnetic field which, in interaction with the magnet arrangement, generates a force for excitation of an oscillatory linear motion. During the interaction between the magnet arrangement and the magnetic field produced by the coil, a torque for excitation of an oscillatory rotational motion is additionally generated.

Abstract: The rectifying characteristic of a brush-equipped direct current machine is improved, and the life of the machine is extended. As illustrated in FIG. 2, a magnetic flux density reduced portion in which the magnetic flux density is reduced is formed in a magnetic pole section of an anisotropic bonded magnet. The position in the magnetic pole section formed with the magnetic flux density reduced portion is formed at the position at which, when a rectifier coil moves in a rectification section, the absolute value of the density of a magnetic flux penetrating the rectifier coil is increased due to the influence of the magnetic flux density reduced portion. Thus, an inverse voltage can be induced in the rectifier coil in the direction of inversion current during a rectification period. It is therefore possible to facilitate the inversion of the current, and to compensate for inadequate rectification and improve the rectifying characteristic.

Abstract: In a magnet-exciting rotating electric machine, a magnetic field pole part opposing an armature is composed to be divided into a surface magnetic pole part and a magnetic excitation part so as to be capable of being relatively displaced. The magnetic excitation part supplies a magnetic flux to a magnetic salient pole. The magnetic flux from the field magnet is divided into a main magnetic flux pathway that circulates through the armature side and a bypass magnetic flux pathway that does not pass through the armature, and thereby, the magnetic flux of the main magnetic flux pathway is changed. The magnetic resistances of the main magnetic flux pathway and the bypass magnetic flux pathway are composed so that total magnetic flux amount from the field magnet is maintained constant, and then a magnetic force preventing the relative displacement is maintained small.

Abstract: In some embodiments, an electromagnetic motor/generator may include one or more of the following features: (a) a frame, (b) a magnetic section having an upper magnet, a lower magnet, and a center magnet, coupled to the frame, and (c) at least one solenoid coupled to the frame and the center magnet.

Abstract: A DC motor includes a stator of magnets surrounding a rotor containing coils of wire surrounding cores. Brushes serve to repeatedly start and interrupt the supply of current to the individual coils via respective commutator segments of the rotor in order to rotate the rotor. Each pole includes a reduced magnetic flux density area and an increased magnetic flux density area. The potential discharge between the commutator segments and the brushes supplying current to the individual coils is reduced by altering the magnetic forces of the poles within the reduced magnetic flux density area and the increased magnetic flux density area. The magnetic forces of the poles are altered by using either separate magnets of varying levels of strength or by altering the gap between the cores and the poles.

Abstract: A Lorentz actuator provides a force between a first part and a second part of the apparatus, comprising a main magnet system, attached to a first part of the apparatus and providing a first magnetic field; a subsidiary magnet system, attached to the first part and arranged in a Halbach configuration, providing a second magnetic field; and an electrically conductive element attached to a second part of the apparatus and arranged so as to produce a force between the first and second parts of the apparatus by interaction of an electric current carried by the electrically conductive element and the combination of the first and second magnetic fields.

Abstract: A flux ring for a motor of a power tool has an annular housing which fits inside the motor can of the motor. At least one magnet is on the ring. The at least one magnet includes a portion formed from an isotropic magnetic material and a portion formed from an anisotropic magnetic material. Preferably, the isotropic magnetic materials is sandwiched by the anisotropic magnetic material. The magnets being molded onto the flux ring in a two shot process.

Abstract: A miniature PMDC motor 10 has a permanent magnet stator comprising two arcuate ceramic magnets 20 fitted to a can-like housing 11 and circumferentially separated by interdisposed rubber magnets 21 wedging or nipping the ceramic magnets 20 in place within the housing 11 without the use of circumferential magnet stops formed in the side of the housing.

Abstract: A commutator includes six segments disposed in the direction of rotation, and is attached to one axial end of an armature. By the commutator rotating together with the armature, each of the segments successively contacts a brush. Each of the segments is electrically connected with terminals through mid-terminals. Three of the six terminals, non-adjacent and alternatingly located in the direction of rotation, are electrically connected directly with mid-terminals facing in radial opposition. Capacitors are electrically connected directly with the terminals adjacent in the direction of rotation. Discharge does not occur between the brush and segments when the brush separates from the segments accompanying rotation of the armature, since electromagnetic energy built up in the coils of the armature is temporarily built up in the capacitors.

Abstract: In order to provide a motor characterized by a high level of efficiency equal to or better than that of using the silicon steel plate, achieved by easy production method and reduced core loss, which result from reduction in the manpower for production by using the sintered metal or powdered iron core in at least one of the stator and rotor, the present invention provides a motor comprising a stator and a rotor wherein either one of said stator or rotor has a magnet, and the other has a magnetic substance. This motor is further characterized in that the main magnetic flux flowing between the stator and rotor changes in the three-dimensional directions according to the magnetic structure of this motor, and at least part of said magnetic substance is composed of an aggregate of magnetic powder.

Abstract: The armature of a direct-current motor is formed by an armature core and armature coils. The core includes teeth, which are arranged at a pitch of a predetermined angle. The coils are wound about every group of selected teeth of a predetermined number. Two magnets face each other with the armature in between. Each magnet includes main portion, an extended portion, which extends from the main portion, and a first weak flux part. The first weak flux part is located in the vicinity of the border of the extended portion and the main portion. The first weak flux part extends along one pitch of the teeth. The flux of the first weak flux part gradually increases along the rotation direction of the armature. The motor also includes a commutator, which has segments. The segments are connected to each coil. A pair of brushes can contact each segment. The brushes supply current to the coils through the segments.

Abstract: A Lorentz actuator provides a force between a first part and a second part of the apparatus, comprising a main magnet system, attached to a first part of the apparatus and providing a first magnetic field; a subsidiary magnet system, attached to the first part and arranged in a Halbach configuration, providing a second magnetic field; and an electrically conductive element attached to a second part of the apparatus and arranged so as to produce a force between the first and second parts of the apparatus by interaction of an electric current carried by the electrically conductive element and the combination of the first and second magnetic fields.

Abstract: A DC motor has a stator that is constituted as a hybrid magnet. The stator has a plurality of electromagnets and permanent magnets that are alternately arranged in the circumferential direction of the stator. Fixed cores of the electromagnets have pole cores that have an approximately arched cross-sectional shape. When direct current is supplied to fixed coils, the pole cores are alternately magnetized to be N- and S-poles in the circumferential direction of the stator. The permanent magnets are anisotropic magnets. The inner surface of the permanent magnet includes a first portion that is arranged in one of both sides in the circumferential direction and magnetized to be an S-pole and a second portion that is arranged in the other of both sides in the circumferential direction and magnetized to be an N-pole. The first portion contacts the pole core that is magnetized to be an S-pole and the second portion contacts the pole core that is magnetized to be an N-pole.

Abstract: A direct current motor is comprised of an armature, magnets arranged to face each other through the armature, a commutator and brushes. The armature has a core and a plurality of coils wound on the core. Each magnet has a main part and an extension extending form the main part. The main part has an angular interval which corresponds to an interval of winding each coil, so that the extension is positioned outside the coil in the circumferential direction. During the commutation period of the coil, that is, during shorting of the coil by the brush, the amount of magnetic flux passing through the coil is changed by the extension of the magnet. Thus, an induction voltage is generated in the coil to counteract to a reactance voltage of the coil.

Abstract: A circumferential confronting type motor includes an armature core that has drive coils wound around its plurality of poles, and a drive magnet positioned opposite to the armature core in the radial direction. The drive magnet has a plurality of divided magnetized sections, each with a magnetic center, formed separated from each other in the axial direction by a non-magnetized section. The magnetic centers of the respective plurality of divided magnetized sections are provided in symmetrical positions with respect to a magnetic center in the axial direction of the armature core. Further, electromagnetic action between the drive magnet and the armature core causes the two to rotate relatively, while magnetic action between the plurality of divided magnetized sections and the armature core regulates their relative movements in the axial direction.

Abstract: A flux ring for a motor of a power tool has an annular housing which fits inside the motor can of the motor. At least one magnet is on the ring. The at least one magnet includes a portion formed from an isotropic magnetic material and a portion formed from an anisotropic magnetic material. Preferably, the isotropic magnetic material is sandwiched by the anisotropic magnetic material. The magnets being molded onto the flux ring in a two shot process.

Abstract: An object of the invention is to provide a synchronous induction motor realizing a great reluctance torque by concentrating a magnetomotive force generated by a rotor provided with a permanent magnet having a two-pole structure, and having a high efficiency. The synchronous induction motor has a stator provided with a stator winding, a rotor rotating within the stator, a cage-type secondary electric conductor provided in a peripheral portion of a rotor yoke portion constituting the rotor, and a permanent magnet inserted into the rotor yoke portion and having a two-pole structure, and the magnetomotive force generated by one pole of the rotor is set to a value equal to or less than 10% of a peak value in a predetermined range near an electrical angle 0 degree or 180 degrees.