Abstract: In a brushless motor 1, a rotor 5 is rotatably arranged in the inside of a stator 4 and the rotary position of the rotor 5 can be detected by a resolver 10. The stator 4 includes a stator core 7 around which a drive coil 6 is wound and a case 8. The rotor 5 includes a rotor shaft 2 and a rotor magnet 9. A resolver rotor 27 is rigidly secured to the rotor shaft 2. A resolver mount unit 15 is arranged between the case 8 and a bracket 14 and contains a resolver stator 16. The resolver mount unit 15 is made of synthetic resin and a power supply line coupler 20 and signal line coupler 21 are integrally molded with it and arranged radially relative to the center O of the shaft of the rotor 5. The resolver stator 16 and the resolver mount unit 15 may be integrally molded.

Abstract: This case is about the rotating electric machinery in which between the rotating shaft of the electric machinery and the electric machinery rotor or between the electric machinery rotor and the stator, or between the rotating shaft of the electric machinery and the stator, there is installed centrifugal force producing axial pulling structure and there is installed axial pre-stressed spring, and to the rotating shaft of the electric machinery there can be optionally installed axial position limiting structure, and by making use of the speed of the electric machinery rotor, the electric machinery rotor is modulated to produce corresponding axial displacement, and further to modulate the electric machinery characteristics between the electric machinery rotor and the electric machinery magnetic field.

Abstract: A flux generator base unit electromagnetically coupled with a receiving unit to transfer energy into the receiving unit. The base unit includes one or more permanent magnets that produce a magnetic flux, which passes through a receiver coil in the receiving unit. The receiver coil is either disposed in a separate housing that is electrically connected with a portable device, or integrated into the housing of the portable device. Either the permanent magnets or a flux shunt is moved in the base unit to produce the varying magnetic flux that is coupled to the receiver coil. As a result of the varying magnetic field experienced by the receiver coil, an electric current is induced in the receiver coil, which is conditioned (e.g., rectified, filtered, and regulated) by a conditioning circuit to charge a battery or energize electronics contained in the portable device.

Abstract: An articulating probe head includes motors 12 and 18 for driving respective output shafts 14 and 20 about respective orthogonal axes z and x to move a stylus 22 over the surface of a workpiece under the control of a controller 26. At least one of the motors is inertia balanced by mounting the stator 32 of the motor on bearings 42 to allow it to rotate in opposition to the rotation of the rotor 34. Control of the speed of the spinning stator is achieved by connecting it to the winding assembly 46 of an additional “back-to-earth” motor 47 the magnet assembly 48 of which is connected to the housing. The motor 47 acts as a brake to prevent overspeeding of the rotatable stator, and can have power supplied to it to ensure that the stator does not slow down excessively when the main motor is running at constant angular velocity. Control of the power supply to the motors is achieved by the controller 26.

Abstract: A positioner has a first surface with a plurality of controlled electromagnets and a second surface having a circular cross-section movably positioned relative to the first surface. A plurality of magnetic positioners are disposed around the second surface. Control logic energizes a sequence of the controlled electromagnets to create magnetic interaction with the plurality of magnetic positioner and thereby move the second surface relative to the first surface. A rotor may be positioned to rotate relative to the second surface. Electromagnetic pickups in proximity with the rotor receive a time-varying electromagnetic field from rotor magnets as the rotor rotates, thereby generating electrical energy.

Abstract: A motor includes a cylindrical magnet, first outer magnetic pole portions which are formed by gapping part of a cylinder from the distal end in the axial direction of the motor and oppose the outer circumferential surface of the magnet, second outer magnetic pole portions which are formed by gapping part of a cylinder from the distal end in the axial direction and oppose the outer circumferential surface of the magnet, first inner magnetic pole portions opposing the inner circumferential surface of the magnet, second inner magnetic pole portions opposing the inner circumferential surface of the magnet, a first coil which is located at a position between the first outer magnetic pole portions and the first inner magnetic pole portions in the axial direction of the magnet and excites the first outer magnetic pole portions, a second coil which is located between the second outer magnetic pole portions and the second inner magnetic pole portions on the opposite side to the first coil in the axial direction of the

Abstract: The invention relates to a lift/swivel drive comprising a working element (2) which can traverse rotationally and linearly in relation to a housing element (1). In order to displace the working element in a controllable linear and rotative manner in relation to the housing element (1), at least one linear motor (5) and at least one rotative motor (7) are assigned to the working element (2) and/or the housing element (1).

Abstract: An apparatus and method of powering a light source are provided. The apparatus includes a motor, a voltage stabilizing circuit, and a light source. The motor includes a field assembly and an armature assembly. The field assembly includes an intermediate tap on a field winding that forms a variable field winding power source. The stabilizing circuit connects to the intermediate tap and includes a voltage regulator having an output that is connected to a light source to be stabilized.

Abstract: A superconducting rotating machine includes a direct current field excitation source and an alternating current armature winding mounted on a stationary support member, at least one of which includes a superconducting material, a core member formed of a magnetic permeable material and rotatable around the static support member, and a refrigerator unit which cryogenically cools at least one of the field excitation source and the armature winding. The superconducting rotating machine may have a construction for providing polyphase (e.g., three-phase) power.

Abstract: An array (10) contains a rotary electromagnetic motor (11) and/or a linear electromagnetic motor (12) that is (are) attached to a tool-carrying sleeve (19) of a machine tool that carries out high-speed working in order to draw off shavings, in which magnets (13, 14i) of the motor(s) are integral with the tool-carrying sleeve (19) itself. In the array (10) magnets (13, 14i) are made integral with the tool-carrying sleeve (19) by a hollow tube (15) that is attached coaxially to the tube on an inside wall (15g) where the magnets are attached coaxially. The array (10) also contains a hollow shaft (16) that is fixed in place while the array (10) is in operation and is inserted coaxially into the hollow tube (15). A number of stator induction coils (17) that interact with the magnets (13, 14i) are arranged on an outer surface of the hollow shaft, and coaxially with respect to the hollow tube.

Abstract: An electric motor additive speed drive assembly comprising at least two incrementally increasing diameter electric motors mounted in an integrated concentric manner along a common axis such that the speed and horsepower of the assembly output shaft is the sum of the speed and horsepower of the energized electric motors in the assembly. At least one set of electrically conductive end bearings spans the annular space between the casings of each motor in the assembly allowing the stators of each internal motor to rotate. Electricity is conducted to each inner motor through the electrically conductive end bearings.

Abstract: An improved voltage unipolar generator utilizing a pair of electrically interconnected, counter-rotating, circumferentially segmented, conductive disks. Rolling contacts such as conductive balls or tapered pins are used to electrically interconnect the two counter-rotating disks in a manner that places the majority of the disks' segments in an electrical series. An axially magnetized co-rotating, neodymium-iron-boron permanent magnet having a diameter similar to said disks is the preferred field source. A ferrite disk of appropriate thickness is placed opposite the field source to compress said disks and rolling contacts for optimized electrical interconnection of said disk segments.

Abstract: A machine (1) (42) wherein a frame (2) supports at least one operating head (34) (34a, 34b) via the interposition of an actuating device (4) for enabling the operating head (34) (34a, 34b) to move in relation to the frame (2) within a predetermined volume; and wherein the actuating device (4) is defined by two electric motors (14,24), the respective axes (6,21) of which are parallel to each other; and wherein a rotor (15) of one (14) of the two motors (14,24) is supported by the frame (2) and eccentrically supports a stator (23) of the other motor (24), a rotor (25) of which supports a straight guide member (31) in turn supporting a powered slide member (33) in turn supporting the operating head (34) (34a, 34b).

Abstract: A device is presented having a multiplicity of motors connected to a shaft. A multiplicity of motor control devices are connected to the motors. A multiplicity of bearings are connected to the motors and the shaft. The multiplicity of motors, the multiplicity of motor control devices and the multiplicity of bearings continue to control the shaft rotation speed upon failure of either one of the multiplicity of motors, the multiplicity of motor control devices, or the multiplicity of bearings. Also presented is a device having at least one motor connected to a shaft. At least one bearing is connected to the at least one motor and the shaft. The at least one bearing has a multiplicity of rotating sleeves.

Abstract: An electric motor comprising a shaft 300 on which is mounted n motor modules (where n is an integer). Each motor module consists of two generally disc-shaped rotors 302 having a coil 304 sandwiched between them. Each rotor/coil module is separated from the adjacent module by an insulative spacer element 306 and a PTFE disc 308 which is mounted on the shaft 300 concentrically with the rotors 302 and the coil 304. The axis about which each coil 304 is wound is substantially in line with the axis of rotation of the respective rotors 302.

Abstract: A housing of a compressor supports a rotary shaft. The rotary shaft is coupled to a pulley with a pulley one-way clutch and is coupled to a rotor of an electric motor with a motor one-way clutch. The pulley is supported by the housing with a pulley bearing. The electric motor overlaps a power transmission portion in the axial direction of the rotary shaft. At least two of the bearing, the pulley one-way clutch, the motor one-way clutch, and a brush device of the electric motor overlap each other in the axial direction of the rotary shaft. As a result, the size of the compressor is reduced in the axial direction of the rotary shaft.

Abstract: A motor device including a pair of motor units and a driven member meshed with rotary gears of the pair of motor units to drive the driven member, the motor units each including a rotary magnet that is cylindrical and magnetized so as to have different magnetic poles in turn along the circumferential direction, a rotary gear having a plurality of teeth, the rotary gear rotating about the rotation axis of the rotary magnet together with the rotary magnet, and a stator member having a plurality of outer magnetic poles that are arranged on the outer periphery of the rotary magnet and a plurality of inner magnetic poles that are arranged on the inner periphery of the rotary magnet and are opposed to the outer magnetic poles, the plural outer magnetic poles and the plural inner magnetic poles being excited by a coil.

Abstract: A roller device includes at least a roller unit having a fixed immovable shaft rod combined with two coiled stator units having silicon steel stators respectively wound with a coil. Each coil stator unit has its outer circumference covered up by a tubular-shaped magnet rotor unit having a plurality of magnet rotors fitted inside, with every two abutting magnets axially and biasly positioned. Then, a combination unit composed of a bearing and a bearing outer cover is fixed respectively at two ends of the magnet rotor unit. Thus, the roller unit is completed, having gaps of the magnet rotors and gaps between the magnet rotors and the silicon steel stator. When the coiled stator units are electrically connected, the magnet rotor unit will rotate around the coiled stator unit.

Abstract: The magnetic pole position detector for an electric motor comprises a detection rotor, a detection stator, and magnetic flux concentration tips and magneto electro transducers. The detection rotor is fixed to an axis of rotation of the motor and comprised of disc-like rotors having first toothlike protrusions and a permanent magnet. The disc-like rotors are assembled so as to make the first toothlike protrusions coincide in the axial direction and the permanent magnet is fixed between the disc-like rotors. The detection stator is comprised of stator cores comprised of an annular yoke and stator teeth formed at regular intervals on the former. Second toothlike protrusions are formed on the inner end of the stator teeth. The stator cores are assembled with a gap in the axial direction so as to make respective second toothlike protrusions coincide in the axial direction. The magnetic flux concentration tips and the magneto electro transducers are placed in the gaps in the axial direction.

Abstract: A generator structure is provided for generating electrical power. The generator structure includes an enclosure having first and second spaced sidewalls interconnected by first and second end walls so as to define an interior. First and second generator sets are positioned within the interior of the enclosure. Each generator set includes an engine, an alternator driven by the engine for generating the electrical power and a radiator operatively connected to the engine. Means are provided for synchronizing the electrical power generated by each alternator.

Abstract: An axle drive apparatus includes a first rotor assembly with a first output shaft and a second rotor assembly with a second output shaft for providing independent rotation of the first and second output shafts. There also includes a first and second conductive assembly for, respectively, conducting electrical current into a inducing rotation of the first and the second rotor. Finally, an axial housing commonly connects the first and second rotor and the first and second brush card assembly.

Abstract: A conveying device in which a conveying arm assembly can be quickly set in a conveying position and can be rapidly stabilized in the conveying position includes a conveying arm assembly, a fixed shaft, at least one set of hollow operating shafts which are necessary for controlling an operation of the conveying arm assembly, and a motor provided between the fixed shaft and each of the operating shafts. The one set of operating shafts are attached to the fixed shaft such that they can be rotated coaxially with respect to the fixed shaft outside fixed shaft and are arranged in an axial direction of the fixed shaft. The conveying arm assembly is attached to an end portion of the operating shaft close to the ended of the fixed shaft. The motor comprises a stator provided on the fixed shaft and a rotor provided on each of the operating shafts such that it is opposed to the stator on an outer peripheral side of the stator.

Abstract: A motor/generator comprises a stator (2) having plural coils (C1-C14), and plural rotors (3, 4) disposed coaxially with the above-mentioned stator and driven by a compound current. The phase difference between the currents (70, 71) driving the rotors (3, 4) is arranged to be other than 180 degrees. Thereby, the utilization factor of the voltage of the direct current power supply (10) is improved.

Abstract: A cylindrical stator is installed in a case. First and second discal rotors are installed in the case and arranged at axially opposed end portions of the cylindrical stator to rotate about an axis of the cylindrical stator. A case bracket is installed in the case to support the cylindrical stator. The case bracket is in abutment with an inner surface of the case to be held in the case. With this arrangement, the cylindrical stator is assuredly held and supported in the case.

Abstract: A number of elemental motors or the like are installed on a surface. Their movement is transferred to the actuator to drive the load. The elemental motors or the like can be as thin as desired. The number of the elemental motors or the like can be large to have desired power. Hence, the invented motor can be very thin With position detector, the actuator of the thin motor can make desired movement at desired moments of time. Installing a thin or small reservoir on the same surface to have the actuator drive the plunger of the reservoir, the pump can be thin and can deliver desired amount of liquid at desired moments of time. For medical application, the output medication is delivered into the user's body.

Abstract: An electric machine or assembly 10 including a housing 12, a stationary stator 14, two substantially identical and opposed rotors 16, 18, and a pair stationary field coils 22, 24. Field coils 22, 24 are selectively energizable to controllably vary the flux generated by assembly 10, thereby allowing assembly 10 to provide a relatively constant output torque, power, or voltage over a relatively wide range of operating speeds.

Abstract: In a preferred embodiment, a linear/rotary motor, including: first and second stator structures, having magnetically coupled thereto, respectively, first and second rotors; a first, externally threaded shaft fixedly attached to the first rotor and extending axially therefrom, such that rotation of the first rotor causes rotation of the first, externally threaded shaft; a second shaft, having a splined external surface, extending through a complementarily shaped opening defined through the second rotor, and axially movable with respect thereto, such that rotation of the second rotor causes rotation of the second shaft; and the second shaft including threaded apparatus cooperatively engaging the first, externally threaded shaft, such that rotation of the first, threaded shaft can cause linear motion of the second, cylindrical shaft. The motor can be operated to provide rotary, linear, or simultaneous rotary and linear motion of the second shaft.

Abstract: A machine tool has an operating unit that can be moved by at least one linear motor (24) along a first guide structure in the direction of a first axis of travel (z-axis) and by at least one second linear motor (21, 22) jointly with the first guide structure along a second guide structure in the direction of a second axis of travel (y-axis). Each linear motor (21, 22, 24) includes primary elements as well as secondary elements (15/1, 17; 15/2, 17; 23).

Abstract: A palm top manual operated generator includes a housing, a power generating unit, a driving set, a handle and a spring. The housing has a cambered rack which penetrates into the housing and is engaged with the first speed change gear of the driving set. After changing speed by a plurality of speed change gears of the driving set, power is unidirectionally transferred to a gear of the power generating unit through a unidirectional speed change gear. A plurality of magnets are circularly arranged within the rotary casing. When the handle is held and pressed continuously, the cambered rack drives the driving set. Then rotary speed is increased to drive the rotary casing of the power generating unit to rotate with a high speed. Thereby, electric power is generated due to magnetic excitation; the electric power is outputted from a receptacle through a regulating circuit and a power storage circuit.

Abstract: Disclosed is a brushless generator with permanent magnets, which provides high-speed operation, simple maintenance, lightweight, and stable power. The brushless generator with permanent magnets including a main generator with a stator and a rotor; and an auxiliary generator having a stator made of a hollow stator core and a coil wound around the stator core, and a rotor made of a rotor core rotating within the stator core and a coil wound around the rotor core, where wedges and grooves are formed alternatively on the inner portion of the stator core of the auxiliary generator, and permanent magnets are embedded in the body of the grooves and the coil is wound around the body of the grooves. Accordingly, without the use of a brush, a rated load voltage is generated from the permanent magnets of the auxiliary generator, and voltage variations due to load variations are controlled by the windings of the auxiliary generator.

Abstract: The invention discloses a motor device comprising a pair of motor units and a driven member meshed with rotary gears of the pair of motor units to drive the driven member, the motor units each comprising a rotary magnet that is cylindrical and magnetized so as to have different magnetic poles in turn along the circumferential direction, a rotary gear having a plurality of teeth, the rotary gear rotating about the rotation axis of the rotary magnet together with the rotary magnet, and a stator member having a plurality of outer magnetic poles that are arranged on the outer periphery of the rotary magnet and a plurality of inner magnetic poles that are arranged on the inner periphery of the rotary magnet and are opposed to the outer magnetic poles, the plural outer magnetic poles and the plural inner magnetic poles being excited by a coil.

Abstract: In an arrangement of a plurality of electric machines, the electric machines are defined by axes in parallel relationship, wherein the electric machines include a common stator which incorporates a plurality of stator portions. The stator portions of the stator cooperate with rotors which are insertable in the stator portions, whereby the number of rotors corresponds to the number of the axes of the electric machines.

Abstract: A generator structure is provided for generating electrical power. The generator structure includes an enclosure having first and second spaced sidewalls interconnected by first and second end walls so as to define an interior. First and second generator sets are positioned within the interior of the enclosure. Each generator set includes an engine, an alternator driven by the engine for generating the electrical power and a radiator operatively connected to the engine. Means are provided for synchronizing the electrical power generated by each alternator.

Abstract: A high-power electrodynamic machine operates at a relatively high rotational speed and has dual rotors. In a preferred generator embodiment, one relatively massive first rotor having a magnetic device integral therewith is dedicated to the main generator. The exciter generator, which is relatively less massive, is isolated on a second rotor, which has a magnetic device integral to it. Only three bearings are required. The distance between the two bearings for the first rotor is relatively short, and the first rotor is relatively stiff, both of which facilitate operation of the first rotor below the critical speed. The junction of the first and second rotors further includes support of a junction end of the second rotor. The second rotor is driven by a prime mover via the first rotor. Means for providing electrical connections between the magnetic devices of the first and second rotors is also provided.

Abstract: In a magnetic coupler, a pair of magnet rotors is slidably mounted on rods. Ferrous material on the conductor rotors attracts the permanent magnets in the magnet rotors. Under static or relative static conditions, the attractive force urges the magnet rotors toward the conductor rotors to create a minimum, operational air gap therebetween. When there is a significant relative rotational velocity between the magnet rotors and the conductor rotors, a repulsion force urges the rotors apart. During start-up, latch arms retain the magnet rotors apart from the conductor rotors by a larger, soft-start air gap. During operation, centrifugal force moves the latch arms out of their active position. If the rotational speed of the load shaft decreases rapidly during operation, the magnet rotors move apart from the conductor rotors by a still larger, fully disengaged air gap.

Abstract: In a connection between a motor and a position detector that together constitute a motor actuator, a connection shaft of the position detector is engaged with an outer peripheral surface of a motor output shaft, and a shaft portion of the connection shaft is engaged with an inner peripheral surface of the motor output shaft. Furthermore, radial recesses are provided to be radially outwardly recessed from the inner peripheral surface of the motor output shaft, and one of radial recesses of the motor output shaft engages with a single radial projection of the shaft portion of the connection shaft. Thus, the motor output shaft and the connection shaft are non-rotatably connected with each other, readily accurately.

Abstract: An engine-starting apparatus includes an electric motor and an overrunning clutch that transmits a rotational torque of the electric motor to an internal combustion engine. A coupling speed for re-coupling the clutch for re-cranking the engine while it is still rotating by the inertia is set to a point where an inertial speed of the engine becomes equal to or a little higher than an inertial speed of the electric motor. The electric motor is switched on again when its speed decreases to the coupling speed or lower. In this manner, shocks and noises generated in the re-coupling of the clutch are avoided, and the engine can be smoothly re-cranked while it is still rotating by its inertia.

Abstract: To realize structure simplification and reduction in manufacturing cost without lowering power transmission efficiency and reliability. The present invention includes a first motor 5 and a second motor 6, and a lead 2 of a ball screw 12 is disposed coaxially with a motor rotary shaft 5a on a first motor 5 side and a nut 3 of the ball screw 12 is disposed coaxially with a motor rotary shaft 6a on a second motor 6 side so that the first motor 5 and the second motor 6 are connected to each other via the ball screw 12.

Abstract: A high torque/high speed brushless DC motor system for controlling both the speed and torque of the motor including a rotor and a stator, the stator of the motor including a first, second and third winding. The system further includes means for sensing the position of the rotor and means for selectively configuring the first, second and third windings of the stator in a wye connection when the speed of the motor is less than a predetermined value and configuring the windings in a delta connection when the speed of the motor is greater than the predetermined value.

Abstract: An energy conversion apparatus and method includes a central shaft rotatable around a first axis, at least one body rotating around a second axis, wherein the first axis and second axis intersect at a vertex, wherein the at least one body is connected to the central shaft and wherein the at least one body pivots about a point off the first axis and off the second axis, a drive means disposed adjacent to the at least one body, wherein the drive means is rotated by the at least one body, and a fixed core disposed around the central shaft, wherein the fixed core is connected to the drive means such that the at least one body is capable of orbiting around the fixed core.

Abstract: A variable speed isosychronized motor includes two annular stators conformed for variable angular alignment relative to each other and a common rotor extending a plurality of isolated loops to cross-induce power between stators once such are angularly displaced. In this form of losses, attendant to speed variation through stator phasing are reduced. Electrical compensation may be inserted between each terminal pair. Potentiometers in parallel with capacitors and may be inserted between the respective terminals to expand the operating range of the device.

Abstract: A multishaft electric motor has a plurality of juxtaposed rotors having respective permanent magnets disposed therearound, and a plurality of sets of armature elements disposed fully circumferentially around the rotors, respectively, the permanent magnets of adjacent two of the rotors having a plurality of pairs of unlike magnetic poles for magnetically coupling the rotors through the armature elements between the permanent magnets. A positive-displacement vacuum pump includes a casing, a pair of pump rotors rotatably disposed in the casing in confronting relation to each other, and a two-shaft electric motor coupled to the pump rotors for rotating the pump rotors in opposite directions. The two-shaft electric motor may comprise a pair of juxtaposed rotors and a pair of sets of armature elements disposed fully circumferentially around the rotors, respectively.

Abstract: A brushless exciter comprising a shaft adapted to rotate about a first axis; a cylindrical ferrite core mounted upon the shaft; and a ferrite casing surrounding the ferrite core, having a cylindrical inner surface coaxial with the first axis, and adapted to remain stationary. A first transformer winding comprises a first conductor wound circumferentially about the ferrite core co-axial with the first axis. A second transformer winding comprises a second conductor mounted on the ferrite casing inner surface concentric with the first transformer winding. The second winding has a diameter larger than the diameter of the first winding by an amount just sufficient for the first transformer winding to rotate without contacting the second transformer winding. The ferrite core and the ferrite casing form a substantially complete enclosure for the first transformer winding and the second transformer winding.

Abstract: A gyroscopic stabilization and power management system that may be incorporated into a plurality of different devices. The system includes a flywheel, a motor centrally disposed within the flywheel such that the motor housing and flywheel rotate together when the motor shaft is fixed against rotation. A plurality of batteries or other power sources are radially disposed and integrated into the flywheel. The batteries increase the overall mass of the flywheel, thereby increasing its gyroscopic operation during rotation, in addition to providing power to the motor for operation. A printed circuit board connected to the flywheel handles all electronic controls both internal and external to the flywheel, including, for example, power control, speed control, electrical/mechanical power management, dynamic braking and radio controls.

Abstract: Autonomous system for generating electricity comprising energy storage by inertial flywheel.

Abstract: An inverter (23) generates a composite current comprising an electrical current for a first rotor (4) and an electrical current for a second rotor (3). A microprocessor (22) controls the inverter (23) so that the average value of the composite current is smaller than the sum of the average values of the respective currents.

Abstract: An inner rotor (5) provided with a plurality of magnetic poles is disposed on an inner side of a ring-shaped stator (3) of a motor/generator (1). The outer rotor (7) provided with a number of magnetic poles is disposed on an outer side of the stator (3). The number of magnetic poles of the outer rotor (7) differs from the number of magnetic poles of the inner rotor (5). The stator (3) is provided with coils (16) simultaneously generating a magnetic field synchronized with the rotation of the inner rotor (5) and a magnetic field synchronized with the rotation of the outer rotor (7). The stator (3) is provided with a plurality of cores (3A) partitioned on a circumferential periphery and composed of a magnetic material to allow coils (16) to be wound thereon. Connectors (19) are provided connecting a part of one core (3A) to a part of an adjacent core (3A).

Abstract: Disclosed is a multi-phase flat-type PM stepping motor comprising a first motor unit having a first stator unit and a first rotor unit, and a second motor unit having a second stator unit and a second rotor unit. The first stator unit has a plurality of air-core coils that are radially arranged on a first isolating magnetic disc. The first rotor unit has a plurality of permanent magnets that are alternatively magnetized in N-pole and S-pole and radially arranged on a second magnetic disc with a predetermined air gap with respect to the coil surface of the first stator unit. In the same manner, the second stator unit has a plurality of air-core coils that are radially arranged on a third isolating magnetic disc, and the second rotor unit has a plurality of permanent magnets arranged on a fourth magnetic disc. The first and second motor units are coaxial and symmetric with each other about a non-magnetic disc arranged therebetween.

Abstract: A rotary electrical machine (1) has at least one stator (23). The stator is provided with at least one radial channel (107) for ducting cooling air. The channel (107) extends between a first position (113) at or substantially near the rim (109) of a winding region of the stator (23) and a second position (119) at or substantially near the center (51) of the winding region. The machine (1) has cooling means (91-97) for causing cooling air to enter the radial channel (107) via the second position (119) and exit via the first position (113). The stator may have electrical windings arranged as coil sectors (183-197) disposed substantially equi-angularly in a generally circular pattern. At least some of the coil sectors are wound in a generally spiral fashion when viewed axially. A rotor (13), for the machine may have a plurality of equi-angularly spaced magnets (127), which are generally circular but with a cut-away portion, when viewed axially.

Abstract: To facilitate the fabrication work of a stator column assembly and improve full and wise use of resources, as well as to prevent contact accident between a mold portion of a stator column and a rotor shaft due to the thermal inflation.