Abstract: An electrical homopolar capacitor generator includes a set of stacked dielectric plates and conductive plates arranged in a magnetic field, with at least one of the dielectric plates is rotated relative to the remainder of the plates to generate an electrical output charge between the conductive plates. One version of the generator employs flat circular disks with an inner dielectric disk rotated relative to the others. The inner disk is placed between a pair of electrically conductive plates, which in turn are placed between a pair of first and second dielectric plates which are in a fixed relationship to the conductive plates. A second embodiment utilizes concentric cylinders in a similar arrangement to the stacked circular disk embodiment, with relative rotation of an inner dielectric being effected along a common axis for all of the cylindrical plates.

Abstract: A brushless DC motor includes opposed pairs of axial magnetic field type permanent-magnets. Two opposed stators are axially arranged at two opposite sides of a rotor, each and stator includes a plurality of equiangularly spaced electromagnetic zones and in least one winding at each electromagnetic zone. A control system is provided to detect phase angle and the revolving speed of the rotor through a sensor and to control the connection of DC current to each winding and its direction, enabling the windings in the electromagnetic zones to form with the rotor at least one motor. By means of detecting speed change of the rotor through the sensor, the control system controls the opposed pairs of axial magnetic field type permanent-magnet brushless DC motor to operate under different motor operation combinations and to output different torques.

Abstract: The torque produced by an electric machine of the axial air gap type is increased by pressing or forming the active sectors of the radial coil sections, essentially coplanar, and by using nonuniform cross-section conductors for the radial active sectors of the coils. One of the active sectors of a leading radial coil section and one of the active sectors of a trailing radial coil section are confined within the central open area formed in a first coil. The gap required between the permanent magnets of rotors, necessary to accommodate the axial thickness of a stator, is reduced to little more than the axial thickness of a single radial section of a stator coil in the active area of the coil. The stator coils can be made by joining winding sheets together. The winding sheets can be made by forming coils from flat, thin conductor coils on carrier films.

Abstract: A rotor for use in an electric machine, such as an electric motor having a pair of stators and a rotor, which includes a central sheet, typically connected to a rotating shaft, having a pair of opposing faces, typically parallel, and one or more pairs of permanent magnets. The magnets of each pair of magnets are connected to the central sheet directly or nearly opposite from each other on opposing faces of the central sheet. The pair of magnets are mounted so that their polar orientation is co-directional.

Abstract: A cylindrical or radial air gap, electrical machine is defined which comprises a circular rotor section having a serrated circular surface area mounted on a shaft with rotation means, two or more circular stator sub sections having circular serrated surface areas are assembled around the circular rotor section, which define an air gap between them. Normally after stator sub sections are assembled around the circular rotor section, end brackets or housings units are usually clamped around them.

Abstract: A pump including a pump casing having an inlet and an outlet, and an impeller having a rotary axis and being rotatably mounted within the pump casing for rotation about the rotary axis is provided. The impeller is configured and positioned relative to the pump casing so that the rotation of the impeller is effective to urge fluid from the inlet to flow through the outlet. A rotor assembly, coupled to and rotatable with the impeller, is provided with a plurality of permanent magnetic poles which are arranged in a generally flat array. A stator assembly is spaced apart from and generally facing the generally flat array of magnetic poles and includes a stator and a plurality of magnetic windings positioned and adapted to effect rotation of the rotor and the impeller upon energization thereof. A bulkhead is positioned between the rotor and the stator. The bulkhead includes a centrally located mounting feature.

Abstract: A magnet type stepping motor which has (1) a stator with three-phase stator windings, and 6 m pieces of stator main pole arranged side by side, where m is an integer and.gtoreq.1, the stator windings of one phase are wound around every two stator main poles among the 6 m pieces of the stator main pole, wherein when the stator windings of one phase are excited with a direct current, m pieces of N pole and M pieces of S pole are formed alternately on the 6 m pieces of stator main pole, and (2) a rotor of a cylindrical permanent magnet magnetized in the circumferential direction to form Z/2 pieces of N pole and Z/2 pieces of S pole alternately, where Z is the number of rotor poles.

Abstract: A motor provided with a rotational-speed detector has a driving coil for driving the motor, a driving magnetized portion, a rotational-speed detecting magnetized portion, and a detecting pattern. An even number of blocks of the detecting patterns having detecting lines are provided. A pair of blocks are displaced from each other in the rotating direction in relation to the arrangement of the N poles and the S poles of the rotational-speed detecting magnetized portion by an amount equal to one pitch between the detecting lines. An adder for adding currents flowing in the detecting lines of the respective blocks is provided. Alternatively, a subtracter for calculating a difference between currents flowing in the above-mentioned detecting lines is provided. Due to magnetic flux from the driving coil, noise currents are generated in the connecting lines for connecting the detecting line. However, noise currents IA and IB generated in the respective blocks A and B cancel each other.

Abstract: A synchronous machine, in particular a generator for a motor vehicle, has an excitation system with a plurality of electrically excited individual poles in a rotor, preferably in form of claw poles which are excited by at least one common excitation coil, wherein for compensation of a magnetic stray flux, permanent magnets are inserted in free spaces between the axially oriented claw poles on the pole plates mounted on the axial ends of the rotors, and the permanent magnets are supported by a holder against centrifugal forces, so that the insertion of the permanent magnets is simplified and facilitated by a simple and inexpensive holder which reduces parts and mounting expenses.

Abstract: A synchronous machine, in particular a generator for a vehicle, has an excitation system with a plurality of electrically excited individual poles in a rotor, preferably in form of claw poles excited by at least one common excitation coil, in which for compensation of a magnetic stray flux, in the free spaces between the axially oriented claw poles permanent magnets are inserted at the axial ends of the pole plates of the rotor, so that the permanent magnets are supported by a holder against centrifugal forces and held by it, and therefore an especially simple and inexpensive holder is formed which considerably simplifies and facilitates the insertion of the permanent magnets.

Abstract: A double-sided, non-iron core, brushless, axial magnetic field permanent-magnet type DC motor includes a shaft, two electromagnet units parallelly mounted on the shaft, and a permanent magnet unit mounted on the shaft between the electromagnet units and having its direction of magnetization disposed in parallel to the shaft. The permanent magnet unit is allowed to rotate relatively around the electromagnet units by being forced by magnetic repulsion force from both sides. Electromagnetic areas at the electromagnet units are arranged in a staggered manner, enabling permanent steel magnets at the permanent magnet unit to be alternatively fully induced from its two opposite sides to provide a high torsion output. The electromagnetic areas of the two electromagnet units are caused to change the phase alternatively at a 90.degree. phase difference, so that vibration and dead section problems are eliminated during the operation of the DC motor.

Abstract: A brushless motor has a housing including an upper housing and a lower housing;a P.C.B. installed in the upper housing, a stator provided at an underside of the P.C.B., the stator having a plurality of coil layers piled up with each other and insulation layers interposed between coil layers, the coil layers being electrically connected to each other by a conductance member for generating an electric field, a rotor having permanent magnets which are radially disposed on an upper surface of the rotor in such a manner that adjacent permanent magnets have different poles from each other to generate a magnetic field which makes electromagnetic-interaction with the electric field of the stator to rotate the rotor, and a rotating shaft integrally formed at a center of the rotor so as to rotate when the rotator rotates. The brushless motor is advantageous in that since the coil is uniformly patterned, the magnetic field is uniformly generated.

Abstract: A two-phase brushless direct-current (BLDC) motor having a single Hall effect device. The BLDC motor includes a stator comprised of 2n coils grouping as first and second phase coils at a uniform interval, and a rotor which N-pole and S-pole magnets of the same number as that of the stator coils are alternately disposed, the 2n magnets forming n pairs, each pair of magnets are disposed at a uniform interval, wherein a distant ratio from the center of one N-pole magnet to the centers of the S-pole magnets adjacent the N-pole magnet is established into 1:1.4. Since 2n auxiliary magnets are disposed annularly on the rotor with the same length as each other corresponding to the N-pole and S-pole magnets, a single Hall effect device detects the magnetic pole by magnetic flux of the rotating auxiliary magnets and generates the rotating position signal of the rotor, so that a switching controller can activate the first and second phase coils alternately.

Abstract: In a bearing arrangement including a thrust bearing and a radial bearing, the thrust bearing includes a first thrust plate which is fixedly secured to a stator plate, and the radial bearing is integrally attached to the first thrust plate of the thrust bearing. Because the radial bearing is directly attached to the first thrust plate of the thrust bearing, the perpendicularity of the radial bearing with respect to the thrust support surface can be easily ensured. Also, the first thrust plate normally consists of a highly rigid member, and this also contributes in the favorable perpendicularity of the radial bearing with respect to the thrust support surface. This bearing arrangement is useful in a spindle motor for turning a floppy disk in a floppy disk drive.

Abstract: The present invention includes a basic module for a discoidal machine. The module includes at least one stator subassembly and a rotor subassembly. A housing member is connected to the stator subassembly. The stator subassembly and the rotor subassembly are coaxially arranged. A discoidal machine for such modules is also disclosed.

Abstract: The torque produced by an electric machine of the type generally known as an axial air gap motor or generator is increased by using nonuniform conductor wires in the stator phase coils in the areas of the coil where the conductor wires extend radially outwardly from and where they extend radially inwardly toward the center of rotation, i.e. that portion of the coil regarded as the active sectors of the coil. The tapered conductor wires enable the total number of wires employed in a phase coil to be doubled by determining the number of wires that can be used at the median radius of the coil rather than at the inner radius. The tapered conductor extends to cover a greater area within the bounds of the coil. With the tapered width designed to extend and increase radially outwardly from the center of rotation, essentially all the surface area within the windings of the coil can be covered by the conductor wires. Only the insulation areas between the wires is not covered by the conductor wires.

Abstract: The stator disc (18) of the motor (2) of a disc motor type elevator machinery is s provided with an annular cavity (19a) in which the stator (9) is placed. The stator (9) is attached to one of the walls of the cavity. The rotor (13) is placed in a rotor disc (12). Between at least one (28a) of the walls of the cavity (19a) and the rotor disc (12) there is a sealing (26a) which seals the cavity so as to render it a closed space. The sealing blocks the entry of external particles into the rotor and stator.

Abstract: A two-phase electro-mechanical stepper motor having 1) a high ratio of torque per mass and torque per power draw, to be able to develop required rotating torque, 2) a magnetic circuit that allows developing of a significant holding torque while using a limited amount of electric power, and 3) two disk rotors positioned on either side of the stator with aligned poles. The actuator has a shaft extending into the actuator, and a first and second rotor, each fixedly mounted on the shaft, and each having a permanent magnet mounted thereon in opposing fashion. Additionally, there is a stator, loosely mounted around the shaft and positioned between the opposing permanent magnets, and having at least a first and second pole extending toward the first and second rotors respectively.

Abstract: A device such as an electric motor, an electric generator, or a regenerative electric motor includes a plurality of rotor arrangements and a stator arrangement. The stator arrangement has a dielectric electromagnet housing and at least one energizable electromagnet assembly including an overall amorphous metal magnetic core. The overall amorphous metal magnetic core is made up of a plurality of individually formed amorphous metal core pieces. The dielectric electromagnet housing has core piece openings formed into the electromagnet housing for holding the individually formed amorphous metal core pieces in positions adjacent to one another so as to form the overall amorphous metal magnetic core. The device further includes a control arrangement that is able to variably control the activation and deactivation of the electromagnet using any combination of a plurality of activation and deactivation parameters in order to control the speed, efficiency, torque, and power of the device.

Abstract: A rotating machine configurable as a pure DC generator for use in various applications, including recharging batteries in battery operated portable devices. The generator consists of a pair of permanent magnets which are mounted on two rotating magnetic ferrous metal hubs. The magnets are aligned so that they have the same polarity facing each other. The hubs, including the magnets, rotate around a stationary toroidal coil, which creates a magnetic flux. The flux from the two magnets cuts the conductor to the toroidal coil in a same direction upon rotation of the hubs, creating an emf (current) which is always in the same direction. Thus, a direct current is created, without the need for commutation or rectification. The input and output functions of the generator may be reversed to enable the generator to function as a DC motor.

Abstract: A small motor for use in an information-communication appratus, an audio-visual apparatus or the like, and a motor for use in a portable pager and a portable telephone or the like for generating vibrations to be transmitted to a human body, the motors being efficient, small and thin in size, and having a high degree of freedom when mounted on an apparatus. To realize the motor as described above, K pieces of (K indicating any integer greater than one) magnetic units (4a, 4b, 4c) having N and S poles magnetized alternately are mounted on a rotor in a circumferential direction, and K magnetic units are axially stacked in K stages and integrally retained on a shaft (6), and this rotor is rotatably supported on a pair of bearings (9a, 9b). Cores (1a, 1b, 1c) each have a salient pole (7a, 7b, 7c) wound around with coils (3a, 3b, 3c) in K stages so as to correspond to each of the magnetic units.

Abstract: An elevator motor (2) employing permanent magnets (30) attached in a circle on the surface (36) of the rotor disc (12). The rotor disc (12) forms part of both the magnetic circuit and the supporting structure of the rotor (13). The permanent magnets (30) are placed in a separate cavity formed in the stator disc and having one side open, said cavity also housing the stator windings (17). The outer cavity wall directed towards the rotor disc (12) is provided with a sealing member to close the cavity.

Abstract: A magnetic actuator for accomplishing relative movement between an excited actuator member and a passive actuator member, comprising: a magnetic excited actuator member configured to define along its active surface a series of external teeth separated by slots, with a back iron area behind the teeth and slots to complete the flux paths within the excited member, with actuating electrical conductors disposed within the slots to accomplish a distributed conductor electric coil arranged such that the current flows in opposite directions in the conductors in each adjacent slot, to create oppositely-directed flux paths that additively combine in the tooth between the adjacent slots to accomplish a high level of magnetic force with a lower back iron thickness; and a magnetic passive member proximate, and spaced from, the excited member active surface, the passive member completing the flux paths; whereby the position of the passive member relative to the excited member can be controlled through control of the curre

Abstract: Known multi-phase electric machines have conductor lanes which do not sufficiently utilize the space available in the grooves and winding overhang or which are costly to produce. Besides a good utilization of the available space, the length of the conductors in the winding overhangs should be kept short in order to obtain high effiency and power densities, and the number of different conductor designs should be minimized in order to reduce production costs. According to the invention, the electric machine consists of several electric pole units which have each a small number of phases and poles with alternating polarity in the direction of displacement. The electric pole units are located next to each other in the air gap and are mutually offset by a fraction of a pole pitch with respect to the rotor poles. Their meandering rectangular conductor wires extend in layers parallel to the air gap.

Abstract: A rotating electrical machine including a rotor (2), the magnetic circuit of which carries excitation members, and a stator (16), the magnetic circuit of which carries a stator coil. The magnetic circuit of the rotor includes a shaft (1) on which are mounted end flanges (3) and at least one toothed disk (4) disposed between the end flanges, the teeth of the toothed disk being regularly spaced at its periphery, and at least one annular member (9) mounted on the end flanges and having slots (10) regularly distributed at its periphery and in each of which is engaged one tooth of at least one toothed disk. The end flanges and the toothed disk are spaced apart by gaps in which excitation members (14, 15) are accommodated.

Abstract: A hybrid permanent magnet dc motor includes three sets of permanent magnets supported by the rotor and three sets of corresponding stators fastened to the surrounding frame. One set of magnets operates across a radial gap with a surrounding radial gap stator, and the other two sets of magnets operate off the respective ends of the rotor across respective axial gaps.

Abstract: A double rotor-type brushless direct-current motor includes first and second annular-shaped rotors each having a plurality of north and south-polar magnets which are alternately disposed at a predetermined distance; a rotating shaft connected to a central portion of the rotors thorough a bushing; upper and lower cases receiving and rotatably supporting opposite ends of the rotating shaft; an annular-shaped stator having a plurality of stator coils supported by a molding filler to apply electromagnetic force to the first and second rotors in an opposite direction to each other, the stator being mounted between the first and second rotors at a predetermined clearance; and a control printed circuit board for applying a driving current with respect to the stator, the control printed circuit board being mounted one of the upper and lower cases; wherein the upper and lower cases, the control printed circuit board, the first and second rotors have a plurality of ventilating holes for circulating air from the outer s

Abstract: A movable member of the present driving device comprises a magnetized part, or more than one magnetized parts having all the same direction of magnetization, which is perpendicular to the direction of movement. Each magnetized part is moving in at least two air-gaps of a closed magnetic circuit coupled with en energizing coil. The material of the magnetized parts has a linear demagnetization characteristic up to temperatures at least equal to 100.degree. C. and at least up to a negative value of the flux density equal, in absolute value, to 0.5 times the remanence of the magnetic material. The driving device is dimensioned so that the mean operating point of each magnetized part lies at a flux density value smaller than 0.5 times the value of the remanence of the magnetic material used. The volume of magnetic material can be substantially reduced for a given force or torque to be delivered.

Abstract: A motor comprising: a rotor which is supported via a rotating shaft in a radial direction of the rotating shaft, the rotating shaft being disposed around a fixed shaft provided on the side of a stator to form a dynamic-pressure bearing; a stator-side thrust magnet disposed in the stator so as to support the rotor with respect to the stator in a thrust direction of the rotating shaft; a rotor-side thrust magnet disposed in the rotor; and a rotating main body portion mounted to the rotating shaft of the rotor and formed integrally by a resin magnetic material, in which a main magnet portion, an FG magnet portion for generating a speed-of-rotation detecting pulse, and a rotor-side thrust magnet portion serving as said rotor-side thrust magnet are respectively polarized at predetermined positions in the rotating main body portion.

Abstract: A flat coreless vibrator motor has a case and a flat generally sector-shaped armature rotor. The rotor has a body that comprises a first part made of a first synthetic resin having a density of less than 1.8 and a second part made of a second synthetic resin having a density of greater than 5.0. The first part is disposed generally radially inside of the second part. A plurality of flat armature coils are molded in the first part and arranged at a predetermined pitch angle within an angular range of 180.degree. about the rotating axis of the rotor in non-overlapping relationship with one another. Alternatively, at least a portion of the second part is interposed between a field magnet of the motor and a cylindrical side plate of the case.

Abstract: A starter for a drive unit, such as an internal combustion engine, includes a stationary and a movable base element which form a linear motor. The movable base element is seated on a revolving shaft of the drive unit an inertia mass of a flywheel of the drive unit. The inertia mass of the flywheel is rigidly connected with the revolving shaft and is acted upon with sufficient torque required for the starting of the drive unit. Upon starting, the linear motor is switched over into a generator operation.

Abstract: A rotor (10) includes a plurality of permanent magnets (14) disposed around a shaft (12) at generally equal intervals, and a plurality of laminated core members (16) disposed between the permanent magnets (14) so as to form magnetic poles. The laminated core members (16) are formed by stacking a plurality of core-laminations (26) made of magnetic materials and an integral core-lamination, and joining them to each other. The integral core-lamination includes a plurality of core-lamination sections each having a shape the same as that of the core-lamination (26), and connecting portions (46) for connecting adjacent core-lamination sections with each other.

Abstract: A rotor assembly for a synchronous reluctance machine has a plurality of steel punched star-shaped supports secured along a shaft at spaced locations for retaining a plurality of laminated rotor sections. The star-shaped supports have four equiangularly spaced arms having arcuate valleys disposed therebetween that define a plurality of channels for receiving the rotor sections. The rotor sections have a plurality of linearly-disposed apertures for receiving mounting members that extend radially from the valleys of the star-shaped supports. The portions of free ends of the mounting members that extend through the apertures, are stamped or formed to secure the rotor sections to the star-shaped supports. A rotor bar may be disposed within a concave cavity defined by the rotor sections to reduce audible noise produced as the rotor rotates at a high rate of speed.

Abstract: An axial flux reluctance machine including a rotor formed from a wound tape of paramagnetic material, a first stator formed from a wound tape of paramagnetic material and a similarly constructed second stator, where the first and the second stators define stator poles and wherein the stator poles of the first stator are not completely aligned with the stator poles of the second stator. Also a reluctance machine system for energizing the axial flux reluctance machine and methods for forming the wound tape rotor and stators.

Abstract: An in-hub brushless permanent magnet DC motor has a radial working gap but uses coils wound in the axial direction of the motor. The coils generate fields that interact with the permanent magnet fields across the radial gap. The stator includes a plurality of angularly spaced stator teeth that have faces radially spaced across the gap from the permanent magnet. The stator teeth are connected to the base and extend axially into a cavity within the hub. The permanent magnet is a magnetically-segmented ring magnet located on an outer rim of the hub radially outwardly from the stator teeth. The magnetic flux from the permanent magnet is directed radially across the gap and into the stator teeth. Each stator tooth has an axially oriented post around which is wound a coil that generates an axial field. The axially-oriented part of each coil forms part of the magnetic circuit. The magnetic flux directed radially into each stator tooth is turned axially into the post and through the coil.

Abstract: This invention relates to a novel design of electric motor wherein a stationary fuel cell with an electrical output is integrated with a cylindrical type monopole (homopole) electric DC motor. Power is supplied to an output shaft by the introduction of reactants to the fuel cell. The fuel cell is positioned within the hollow cylindrical stator. The stator and fuel cell are stationary. The rotor is a hollow cylinder and is positioned to rotate about the exterior of the stator. The rotor has magnets distributed around the interior of the rotor. This novel compact combination of a fuel cell and a cylindrical form of monopole (homopole) electrical DC motor enables the combination to fit within a confined space.

Abstract: An axial air-gap electric machine comprises a stator including a supporting member having one or more coil structures mounted thereon. The supporting member includes one or more eccentric recesses to accommodate portions of the coil structures, allowing the machine to be constructed more compactly. One important application of the invention is to high-power, low-voltage motors and generators, to accommodate the thick wires leading to the coil windings.

Abstract: The asynchronous discoidal electric motor has stator (1A, 1B) windings (13) and radial rotor bars (2) embedded in notches (11, 22) opened by a very narrow slit (11, 21). These slits (11, 21) and notches (12, 22) may be machined electrochemically using a wire. Application to asynchronous discoidal electric motors with winding embedded in the stator and with a cartwheel structure on the rotor.

Abstract: An electric pancake motor providing multi-directional output for use in a multi-functional apparatus in an automotive setting. The electric motor may rotate an actuator shaft about its axis to provide rotary output, as well as linearly translate the actuator shaft along its axis to provide axial output. Belleville washers, springs or other elastic members may be use to prevent axial translation of the actuator shaft during normal operations. In another aspect of the present invention, the electric motor may be driven by a single power source and selectively actuates at least two mechanically coupled thereto.

Abstract: A flywheel energy conversion device provides highly efficient conversion between kinetic and electrical energy. The flywheel produces increased output by providing armature coils in an air gap formed about the flywheel (both radial and axial embodiments are described). In preferred embodiments, field coils of a magnetic circuit are energized with DC drive current that creates homopolar flux within a rotating solid rotor having teeth cut from a flat disk. The total reluctance of the magnetic circuit and total flux remain substantially constant as the rotor rotates. The flux may travel radially outward and exit the flat disk through the teeth passing across an armature air gap. Airgap armature coils are preferably utilized in which the changing flux density (due to the rotating teeth) induces an output voltage in the coils.

Abstract: A device such as an electric motor, an electric generator, or a regenerative electric motor includes a rotor arrangement and a stator arrangement. The stator arrangement has a dielectric electromagnet housing and at least one energizable electromagnet assembly including an overall amorphous metal magnetic core. The overall amorphous metal magnetic core is made up of a plurality of individually formed amorphous metal core pieces. The dielectric electromagnet housing has core piece openings formed into the electromagnet housing for holding the individually formed amorphous metal core pieces in positions adjacent to one another so as to form the overall amorphous metal magnetic core. The device further includes a control arrangement that is able to variably control the activation and deactivation of the electromagnet using any combination of a plurality of activation and deactivation parameters in order to control the speed, efficiency, torque, and power of the device.

Abstract: The invention relates to a single-phase induction motor comprising a main winding, an auxiliary winding which is arranged so that an electrical angle of the auxiliary winding is different from that of the main winding, a plurality of driving capacitors which are connected to the auxiliary winding, a relay for controlling on/off of the driving capacitor in response to the driving load, and a rotor having apertures on the gap side of the slots. The invention further relates to a rotor assembling apparatus comprising a bush to which a rotor core assembly is inserted for die-casting, wherein a clearance between said bush and said rotor core assembly is narrower to the extent that said rotor core assembly can be taken out after die casting; and a core band having a clearance between the core band and the bush in the circumferential direction of said bush, said core band is engaged into said bush so that movement in the axis direction is restricted.

Abstract: A permanent magnet rotor for an electric generator or motor has a core lamination hub formed of a stack of generally round plates with peripheral slots for holding the first end of a rectangular magnet. Each magnet has an outer end which is held by a slotted pole piece formed of laminated plates. First and second side plates overlie each side of the hub, magnets and pole pieces, and fasteners such as rivets are passed through holes in the side plates, hub plates and pole pieces to form a rigid rotor in which each rectangular magnet is supported and restrained on all six sides. A method for fabricating the rotor is also disclosed.

Abstract: An improved design brushless DC motor has a rotating disk type rotor with trapezoidal shaped permanent magnets connected by a closed magnetic circuit and a stator mounted inside the motor coaxially with the rotor and also having ttrapezoidal shaped stator coils located in the magnetic field generated by the permanent magnets of the rotor. The active parts of the stator coil windings are oriented in a radial direction and are configured to have a width equal to between 0.2 and up to 0.4 of the pole pitch length with the angle between two radiuses which pass through the center of the active part of each coil equal to 360/n (where "n" is the number of magnets). In addition--one or both base lines of each trapezoid is perpendicular to the disk radius and is between 0.7 and up to 0.9 of the pole pitch length. The rotor of the motor comprises three parallel disks and the stator two stator windings with each stator winding positioned between the external and internal disks.

Abstract: A cooling circuit for a motor which includes a rotor having a rotor shaft, and a core fitted on the rotor shaft and carrying a plurality of permanent magnets arranged on its outer circumference. A stator is arranged radially outward of the rotor. The motor cooling circuit includes axially extending oil passages formed in the rotor core radially inward of the permanent magnets.

Abstract: A rotor (10) includes a plurality of permanent magnets (14) disposed around a shaft (12) at generally equal intervals, and a plurality of laminated core members (16) disposed between the permanent magnets (14) so as to form magnetic poles. The laminated core members (16) are formed by stacking a plurality of core-laminations (26) made of magnetic materials and an integral core-lamination, and joining them to each other. The integral core-lamination includes a plurality of core-lamination sections each having a shape the same as that of the core-lamination (26), and connecting portions (46) for connecting adjacent core-lamination sections with each other.

Abstract: A rotor (10) includes a plurality of permanent magnets (14) disposed around a shaft (12) at generally equal intervals, and a plurality of laminated core members (16) disposed between the permanent magnets (14) so as to form magnetic poles. The laminated core members (16) are formed by stacking a plurality of core-laminations (26) made of magnetic materials and an integral core-lamination, and joining them to each other. The integral core-lamination includes a plurality of core-lamination sections each having a shape the same as that of the core-lamination (26), and connecting portions (46) for connecting adjacent core-lamination sections with each other.

Abstract: A motor capable of suppressing the torque ripple includes a rotor, a stator and stator coils. The rotor is provided with a plurality of permanent magnets which are arranged at a constant pitch in the circumferential direction. The stator surrounds the rotor and is formed with a plurality of stator poles and a slot located between every two stator poles. The stator coils are wound on the stator and are supplied with three-phase sinusoidal current. The rotor is composed of a plurality of rotor portions which are arranged in the axial direction of the rotor. The difference between the open angle of each permanent magnet of one rotor portion and the open angle of each permanent magnet of another rotor portion is an integral multiple of 30.degree. in electrical angle. When three-phase sinusoidal current is applied to the stator coils, a torque ripple is generated.

Abstract: An electrical motor includes a stator housing having a toroidally shaped inner cavity. A plurality of stator electromagnets are mounted along the cavity wall in a plurality of parallel helical paths. A plurality of rotor members are rotatively mounted at fixed, spaced-apart angular positions around a ring shaft whose axis is coincident with the axis of the toroidal cavity. Each rotor member includes a plurality of permanent magnets mounted around its circumference. A linear output shaft has one end connected to the ring shaft and its other end extending out of the stator housing. By properly energizing the stator electromagnets, electromagnetic fields set up by them and the rotor magnets interact to produce torque which causes the rotor members to rotate about the ring shaft and to precess laterally causing the ring shaft, and attached linear output shaft, to rotate relative to the stator housing.

Abstract: A brushless motor includes a coil for energizing a motor to thereby rotate a rotor of the motor, a core having a plurality of projection poles around which the coil is wound, a terminal pin serving as a relay in feeding electric current to the coil, a lead wire extending from a terminal end of the coil, and a bracket for fixedly holding the core. The lead wire is electrically connected with the terminal pin directly or indirectly fixed to the core; and the terminal pin is extended to outside of the motor through a through-hole of the bracket so as to electrically connect with a motor driving circuit.