Abstract: An electromagnetic machine which is suitable for use as a direct-drive, directly-coupled, mains electricity generator (14) to be driven by a low speed device such as a wind turbine (18), consists of one or more rotor rings (30) of many permanent magnets (40) of alternating polarity, with coaxial stator rings (28) of many laminated yokes (35), each yoke defining slots to locate coils (38). The yokes (35) and coils (38) form modules which are supported by beams (32) relative to the rotor rings (30). The rotor rings (30) may also be of modular construction. Manufacture and assembly are thereby simplified, and sub-harmonic magnetic flux components are suppressed.

Abstract: A power output apparatus 20 includes an engine 50, a clutch motor 30 having rotors 31 and 33 respectively linked with a crankshaft 56 and a drive shaft 22, an assist motor 40 attached to a rotor-rotating shaft 38, a first clutch 45 for connecting and disconnecting the rotor-rotating shaft 38 to and from the crankshaft 56, a second clutch 46 for connecting and disconnecting the rotor-rotating shaft 38 to and from the drive shaft 22, and a controller 80 for controlling the motors 30 and 40. The controller 80 operates the clutches 45 and 46 according to the states of the engine 50 and the drive shaft 22 and changes the connection of the rotor-rotating shaft 38, so as to enable power output from the engine 50 to be efficiently converted by the motors 30 and 40 and output to the drive shaft 22.

Abstract: A modular planar motor having (a) a mounting plate which has (i) a plurality of openings therein each having an interior surface, (ii) a housing, (iii) a surrounding ridge, and (iv) an undersurface, (b) a superstructure over the mounting plate, and (c) a plurality of modular components each disposed within the openings and having a covering hood for the components, and (d) an aligning and gluing gap between the modular components and the mounting plate and being filled with an adhesive composition for bonding the modular components to the mounting plate.

Abstract: The invention comprises a versatile AC dynamo-electric machine (10) comprising isolated dual stators (50 and 50B and 50C), each both concentrated windings (53C) energizable with single-phase AC, and main windings (53) and a single high inertia sleeve (75) and drive plate (74 and 74A) connected to a rotor shaft (70-73A). The sleeve contains independent electrical rotors (80 and 80A), one for each stator. Each rotor has an innermost layer (82) of magnetizable permanent magnetic material in which the concentrated coils in the stator produce a desired pattern of magnetic poles reacting with the rotating field of the main windings. The machine can function (a) as a synchronous AC motor, or (b) a constant frequency output dual AC generator or (c) as an AC motor-generator with long ride-through time. A UPS system (100) comprises the machine (10) in the motor-generator mode, with clutch means (124) to connect an engine (114) to the rotor shaft (73A) to start the engine.

Abstract: An induction motor as driving apparatus includes two stators in which two rotor cores each formed in a squirrel cage type are rotatably mounted on a common rotary axis; two stators which respectively surround the two rotors and on which stator windings are respectively wound; and a switching device which supplies power by sequentially switching between one side of either the one stator winding or the other stator winding and both the sides of the two stator windings. Starting characteristics and operation characteristics of an induction motor are improved thereby enlarging applications of the induction motor, enhancing operation efficiency, and reducing power consumption.

Abstract: A hybrid stepping motor according to the present invention has coils wound on stator yokes arranged on a fixed shaft or coils arranged on the inner peripheral surface of stator yokes. For this reason, the coils can be easily formed, a coil mounting density higher than that by a conventional technique can be obtained, and cost reduction can be obtained. An auxiliary magnetic plate and an auxiliary magnet are arranged on both the sides of a stator yoke member to form magnetic circuits at both the ends of the stator yoke member. Therefore, motors having various numbers of phases can be obtained, and a core are partially or entirely constituted by a non-layered structure, thereby improving torque/current characteristics.

Abstract: A linear motor having a plurality of stator pieces rather than a ring-shaped stator. Accordingly, production costs are reduced and controllability can be improved. By coupling directly two sets of rotors and stators with a pulsator and spinning tub, an extra power transfer device can is unnecessary.

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: An electric actuator includes a hollow actuator housing, an electric motor connected to the hollow actuator housing, a feed screw shaft coupled to the drive shaft of the electric motor, for transmitting rotational drive power from the electric motor, and a spline tube disposed in the hollow actuator housing in surrounding relationship to the feed screw shaft and held in engagement with the feed screw shaft, for displacement axially with respect to the hollow actuator housing with the rotational drive power transmitted by the feed screw shaft. Since the feed screw shaft is surrounded by the spline tube, dust and dirt particles are prevented from being deposited on the feed screw shaft.

Abstract: A linear electrostatic motor comprises a planar stator having a capacitive structure formed by a metal layer and a layer of dielectric material and a movable member having first and second groups of feet formed by a conductive thin film and arranged in rolling contact on the layer of dielectric material of the stator. In operation, the voltage pulses applied to the feet of one of the two groups have a shift, for example substantially of one half of a period, with respect to the voltage pulses applied to the other group of feet.

Abstract: A brushless synchronous rotary electrical machine comprises stationary stator and "rotor" windings. Only the rotor moves. The rotor winding is a stationary helical winding, concentric with the rotor shaft and attached to the stator armature. Variation in time of the magnetic field associated with the rotor is provided by one or more magnetically interactive (ferromagnetic or ferrimagnetic) projections from the rotor that sweep past the sides of the rotor winding as the shaft rotates. Because all windings are stationary, brushes and rings are not needed. The geometries of the rotor, of the stator windings, and of the magnetically interactive part of the stator armature are arranged so that the entire length of the wire in the windings participates in the generation of AC current (in a generator) or torque (in a motor), and so that loss of power to eddy currents is minimized.

Abstract: Disclosed is an engine-driven welding generator using a plurality of neodymium-iron-boron based rare earth magnets and provided with countermeasures for suppressing a rise in temperature of the magnets.

Abstract: A differential motor/generator apparatus comprising a stator region, a first rotating member and a second rotating member. The stator region includes at least one stator component and an opening. The stator member includes at least one pair of torroid regions each having at least one winding positioned thereon in parallel. The first rotating member is associated with the stator region and is positionable within the opening of the stator region. The second rotor member is rotatably associated with the stator region and includes a cavity. A portion of the stator region and the first rotor member are positionable within the cavity of the second rotating member. This enables the first and the second rotating members to rotate about a common axis of rotation.

Abstract: A rotary electromagnetic actuator comprises a rotatable shaft carrying a rotor which is rotatable relative to a stator. A magnetic circuit is set up which comprises the stator and the rotor, the reluctance of the magnetic circuit being dependent on the relative rotational orientation of the rotor and stator and decreasing in a particular direction of rotation such that the reluctance is a minimum at an equilibrium position to which the rotor is therefore biased. The rotor is selectively impelled to advance away from the equilibrium position, subsequently again becoming part of a magnetic circuit, the reluctance of which decreases in the direction of rotation to a minimum at an equilibrium position to which the rotor becomes biased. The actuator provides undirectional rotation for successive actuations at substantially uniform torque and is suitable for use in actuating rotary devices such as rotary valves.

Abstract: A compound rotor electrical machine includes two or more electrical machines, in the form of motors and/or generators in which magnetic flux paths between magnetic poles of the electrical machines pass in series through the rotors of the machines to form a single flux path which includes the separate rotors.

Abstract: A multipolar motor with two rotors includes two coaxial axially magnetised rotors (3, 5) arranged on either side of an intermediate stator part (17). First (13) and second (15) stator parts, each having a stator opening (19, 20), are respectively arranged on either side of the rotors. The first and second stator parts each have two polar expansions (13a, 13b, 15a, 15b) defining the stator opening. Each of these polar expansions is connected to the intermediate stator part (17) by a major electric circuit passing through the core (30) of a winding (33a, 33c).

Abstract: A T-S converter is composed of a first rotor which has a first control coil, a second rotor and a stator which has a second control coil. The second rotor has a first magnetic field member (such as laminated sheets of ferromagnetic material) which supplies the first control coil with magnetic field and a second magnetic field member (such as laminated sheets of ferromagnetic material) which supplies the second control coil with magnetic field. The first and second control coils are energized to drive the second rotor to rotate at a set speed with a set torque according to vehicle running condition. The first and the second control coil are also energized to generate battery charging current when the vehicle speed is decreased and the second rotor is driven by the vehicle wheels.

Abstract: An auxiliary power source comprising a generator driven by an electric motor or other drive means, the rotor of the generator has multiple core elements mounted side-by-side to provide a large number of poles and accordingly, a relatively high output frequency. Specially dimensioned pole faces eliminate cyclic air gap reluctance variations as an audible noise source.

Abstract: In order that each of its rotors (18 to 21) may he individually controlled, the transducer (1) comprises a stator (2) having two main parts (3, 4) and 2N+1 transverse parts (5 to 13). N openings (14 to 17) through each of which a stator (18 to 21) passes, are each arranged in one of the main parts in the prolongation of one of the even rank transverse parts. N+1 coils each surround one of the odd rank transverse parts.Application to selective driving of several mobile elements.

Abstract: The present invention concerns an electromechanical transducer exhibiting a configuration of the cylindrical type and adapted in particular to serve as a stepping motor. In a three-phase embodiment, the transducer according to the invention comprises a stator (2) and a rotor (4) capable of turning around a rotation axis (6). The stator (2) comprises three pole pieces (8, 10, 12) each having a polar arm (14, 16, 18) oriented in the direction of the rotation axis of the rotor and bearing an energization winding (32, 34, 36).

Abstract: A variable reluctance electric motor includes a stator having a plurality of radially inwardly extending poles which are divided into a plurality of longitudinal sections. The cross sectional shapes of the first stator pole sections are different from the cross sectional shapes of the second stator pole sections. A rotor is supported within the stator for relative rotational movement and includes a plurality of radially outwardly extending poles which are divided into a plurality of longitudinal sections. The cross sectional shapes of the first rotor pole sections are different from the cross sectional shapes of the second rotor pole sections. The first rotor poles are longitudinally aligned with the first stator poles so as to interact therewith when electrical current is supplied to windings provided on the stator poles.

Abstract: A concentric-double-shaft simultaneously rotating apparatus in which a part of the force for driving an inner shaft to rotate is obtained by a device other than a rotation controlled motor to thereby reduce the capacity of the rotation controlled motor to attain reduction in size of the apparatus, increase of stiffness, and so on. The concentric-double-shaft simultaneously rotating apparatus includes at least one permanent magnet which is attached onto an inner circumferential surface of an outer shaft, and a secondary conductor such as a copper pipe, or the like, is provided on an outer circumferential surface of the inner shaft to create an induced current flow.

Abstract: A digital computer controlled air-cycle air conditioning machine for aircraft contains an electrically powered compressor that turns independently of expansion turbine rotation. An electrical generator coupled to the expansion turbine creates additional electrical power during the air expansion portion of the refrigeration cycle. Under control of the computer, that additional electrical power is returned to the electrical supply for re-use with the compressor. The compressor and turbine are manufactured as a unitary assembly. The generator's field windings rotate with the turbine and the generator's armature rotates with the compressor shaft. Voltages generated in the generator's field winding are thereby dependent on the differential speed between turbine and compressor.

Abstract: A bearing system for positioning and supporting a rotor having a vertical shaft coincident with a main rotation axis included in a flywheel used for energy storage and high surge power in vehicular applications includes first and second radial force generators disposed in a first plane perpendicular to the rotation axis of the rotor, the first and second force generators including only electromagnets, third and fourth radial force generators disposed in a second plane perpendicular to the rotation axis of the rotor, the third and fourth force generators including only electromagnets, and upper and lower axial force generators each containing an electromagnet and a permanent magnet. According to one aspect of the bearing system, each of the force generators includes control circuitry having simple and complex lead networks so as to permit the force generators to rapidly respond to vehicular transients while maintaining a desired bearing stiffness.

Abstract: An electrical driving device has three permanent-magnet-excited rotors 3 whose shafts 3S extend through intersections S between a circle 4 and 120.degree. spaced-apart radii 5 which diverge from the centre M of the circle. Each of the cylindrical rotors 3 is associated with three stator poles 7.1, 7.2, 7.3, which are spaced from the cylinder circumference by air gaps 6. Three of these stator poles 7.1 which are situated within the circle 4 are connected by means of yoke irons J.sub.1. The stator poles 7.2 and 7.3 situated outside the circle 4 are connected in pairs via yoke bridges J.sub.2. These yoke bridges J.sub.2 are, in their turn, connected to yoke irons J.sub.3, which carry excitation coils 10. At their ends which are remote from the yoke bridges J.sub.2 all the yoke irons J.sub.3 are magnetically connected via a return yoke J.sub.4. The yoke iron J.sub.1, the stator poles 7.1, 7.2 and 7.3, the Yoke bridges J.sub.2 interconnecting them, the yoke iron J.sub.3 and the return yoke J.sub.

Abstract: A propulsion system for a vehicle comprising an electric motor, circuit breakers which switch field windings of the electric motor, as well as a cooling device which cools the field windings and the circuit breakers by its coolant circuit. The electric motor is realized in the form of a first modular unit which is mechanically functional in itself. The circuit breakers are assembled in at least one second modular unit, which is connected firmly to the first modular unit to form a propulsion unit. The individual modular units can be separated from one another and are connected to one another both by detachable electrical interface connections and also by detachable coolant interface connections. This construction makes it possible to selectively expand the propulsion unit by adding additional modular units, or in the event of the failure or malfunction of individual modular units to replace the modular units without having to replace the entire propulsion unit.

Abstract: Irregularities on the face of the pulley groove of the pulley for driving the rotor shaft of the generator through the one-way clutch are positively extended and a frictional force between the face and the belt is increased, so that a higher torque than the drag torque can be transmitted to the one-way clutch without causing a slippage of the belt. Since no slippage occurs on the belt, the belt life can be extended. Since the one way clutch is positively operated, the inertial energy of the rotor can be effectively recovered.

Abstract: First and second stationary driving coils are disposed about drive shaft means on which magnetized rotor means are mounted so as to exert on the drive shaft means output torques 90 degrees out of phase with each other. Coupling means connect the drive shaft means to an output shaft so as the combine the output torques. Sinusoidal driving signals for the driving coils are generated by Hall devices or other means synchronized to the drive shaft means.

Abstract: In the case of a stator-excited starter-generator, a permanent magnet arrangement, which is magnetized in the opposite direction to the winding excitation, and has yoke overhangs which are radial with respect to the adjacent sector stator elements, is arranged in the axial separating space of two sector stator elements, which are arranged axially one behind the other each stator element is winding-excited by an excitation winding part of opposite polarity.

Abstract: A shaft rotation driving apparatus for a machine tool having a main spindle for rotating a tool or a workpiece, comprises: a magnetic anisotropic rotor formed integral with the main spindle itself or with a rotary sleeve itself fitted to the main spindle; a stator disposed coaxially along an outer circumference of the magnetic anisotropic rotor; a field winding wound around the stator, for magnetizing the rotor in a predetermined direction; and an armature winding wound around the stator, for providing a rotative force to the rotor.

Abstract: An electrical machine of the reluctance or permanent magnet type includes one or more pawns of high permeance material which are relatively moveable along a plurality of C-shaped stators which are regularly spaced at a predetermined stator pitch dimension. The pawn or pawns are of a length equal to or exceeding the stator pitch dimension such that as the pawn is pulled into the air gap of a stator which is energized, the magnetic field induced in the pawn or provided by a permanent magnet is coupled to a following stator which is not yet energized to avoid reverse acceleration of the pawn and reduce vibration. The field coupled to the following stator also reduces the power required to establish a desired level of magnetic flux in the following stator when the following stator is energized. The cross-section of the air gap of the stator and the pawn are closely matched to maintain a minimum air gap when the pawn passes through the air gap of each stator.

Abstract: A plurality of rotating bodies each consisting of an armature, a permanent magnet rotor, or the like are rotatably supported in parallel and rotary shafts thereof are gear-connected to each other so that they may be interlockingly rotatable. Between the mutually nearest positions between respective outer peripheries of the adjacent rotating bodies and inner wall surfaces of the relevant yoke on first- or second-, half rotation sides of the rotating bodies as viewed in the rotation direction, partitioning walls are disposed so as to block the passage of the magnetisms between the adjacent rotating bodies while, on the other hand, opening portions are secured on the other rotation sides thereof as viewed in the rotation direction so as not to block the passage of the magnetisms between the adjacent rotating bodies, whereby forces of magnetic attraction or repulsion act to promote the interlocking rotations of the rotating bodies.

Abstract: An electric drive for a vehicle includes a motor housing; bearing plates closing opposite ends of the housing; roller bearings held in the bearing plates; an electric motor accommodated in the motor housing and including an axially hollow rotor shaft affixed to a rotor and journalling in the roller bearings; a gear housing adjoining the motor housing; a gearing accommodated in the gear housing; a gear coupling the rotor shaft with an input of the gearing; and a first output shaft coupled to an output of the gearing. The first output shaft extends through an end wall of the gear housing and passes axially through the rotor shaft and through the bearing plates. The first output shaft has an end situated externally of the motor housing. The electric drive further has a second output shaft coupled to an output of the gearing. The second output shaft extends through an end wall of the gear housing and has an end situated externally of the gear housing.

Abstract: A drive system comprises first and second motors for driving an electric car in response to alternating electric currents supplied to their coils. The first and second motors have their respective first and second rotors assembled on a common shaft at angular positions which are shifted by a first predetermined angle in their direction of rotation. Moreover, the first and second motors are energized by currents which are shifted in phase by a second predetermined angle. The first and second predetermined angles are individually determined in advance on the basis of the undesirable torque-fluctuation harmonic and the polar ratio of the motor. As a result, the torque fluctuations of the selected harmonic of the motor frequency of the first and second motors can offset each other to reduce the vibrations due to resonances.

Abstract: An apparatus for producing high-speed rotation has a rotary shaft integrally having a first rotor with magnetic anisotropy, and a rotary sleeve disposed around the rotary shaft. The rotary sleeve has a first stator surrounding to the first rotor and integrally has a second rotor having magnetic anisotropy. The first stator has a field winding for magnetizing the first rotor in a predetermined direction. This winding is also an armature winding because it undergoes high-speed rotation with the second rotor. The rotary sleeve is received in a housing which has a second stator surrounding the second rotor. The second stator has a field winding for magnetizing the second rotor in a predetermined direction and for producing high-speed rotation of the second rotor. By analogy, the housing can become a further rotary sleeve, constructed similarly to the above-mentioned rotary sleeve.

Abstract: An electric machine according to various aspects of the invention includes a transformer having a rotating component for transmitting power from a stationary portion of the machine to a rotating portion of the machine, or vice versa. Both the rotating component and a stationary component of the transformer includes a winding, wherein the windings are disposed to be magnetically coupled. Current provided to the winding of the stationary component generates a magnetic field, which induces current in the winding of the rotating component.

Abstract: To reduce the moment of inertia and eliminate variations in speed of two xial, driven shafts, in which an outer shaft (8) surrounds a central spindle (2), which is particularly important for coiling filament material used in electric lamps, the motors are formed as essentially identical permanent-magnet rotor motors, in which permanent magnets are securely affixed to the central spindle and the surrounding shaft (8), respectively, the stators of which are retained in a common housing (6). The outer shaft carries a supply reel (3) for the filament to be coiled, whereas the inner shaft carries a winding head (7) and a reciprocating deflection roller arrangement for winding the filaments. A typical speed of operation is 1.5 seconds to wind a filament and 0.2 second pause between sequential filaments. Such filaments can be used, for example, in a general-service 60 W lamp.

Abstract: An a.c. electrical machine includes a plurality of first elements spaced from each other; a plurality of second elements spaced from each other and interstitially disposed with the first elements; a plurality of electrical windings on each of the first elements providing a current flow in a first direction; and a return for completing a magnetic flux path in a second direction perpendicular to the first direction on successive first elements and through the second elements for generating a force in a third mutually perpendicular direction between the first and second elements.

Abstract: At least two corners of a basical rectangle, as seen from the top of a spindle, are bevelled so as not to come into contact with each other. As a result, such spindles can be easily installed on a textile machine by using the same spindle gages, without increasing the accuracy with which the spindles are installed.

Abstract: Proximity switches and circumferentially movable stator windings allow a motor-generator to simultaneously sense and switch from a synchronous motor position to a synchronous generator position. This mechanism replaces the conventional separate sensing and switching of motor-generator functions. Automatic rotational repositioning of the stator maintains constant voltage and prevents the generation of transient voltages or harmonics. The stator flux leads the rotor magnetic flux slightly in an import power or motor position, creating a torque on the rotor and a counter torque on the stator reacted by the fixed casing of the apparatus. As the stator field weakens due to a failure of the normal power supply, the counter torque also weakens and the stator windings are biased to begin to turn with the rotor until the rotor and stator fields are in step, i.e., when virtually no current is generated or consumed or until a full export power or generator position is reached.

Abstract: The present invention includes an improvement to a conventional explosion-proof electric brake motor having a motor housing, an electrical conduit attached thereto, a brake housing secured to the motor housing and having an electrical attached to the brake housing, a flange secured to the motor housing and adapted to secure the motor to a drive mounting for driving a shaft. The improvement comprises a first housing waterproof means inserted between the motor housing and the brake housing. A first conduit waterproofing means is adapted to seal the brake electrical conduit to the brake housing. A second conduit waterproofing means is adapted to seal the motor electrical conduit to the motor housing. A flange waterproofing means is adapted to seal the flange to the motor housing. Thus, the conventional electric brake motor and the waterproofing means form a submersible, explosion-proof brake motor.

Abstract: A bobbin or spool is molded of thermoplastic with one end flange of substantially greater diameter with a plurality of arcuately spaced voids through the flange. A coil is wound on the bobbin and a first ferromagnetic cup with integrally formed spaced finger-like plural pole segments in a circumferential array is axially received over the smaller spool flange and coil with the pole segments extending through the voids in the larger spool flange. A second ferromagnetic stator cup with finger-like spaced plural pole segments in a circumferential array is nested against the larger spool flange with the pole segments interdigitated with the pole segments on the first cup. A third stator member interconnects the first and second stator cups through the spool; and, a permanent magnet rotor is journalled on the third pole segment within the stator pole segments. The larger spool flange has electrical connectors received in slots and attached to the ends of the coil.

Abstract: Methods and apparatus for flexibly and elastically creating a nonbinding downhill effect is disclosed. The downhill effect physically translates the center-of-mass of rotating apparatus in a forward direction circumferential to the direction of motion which aids in the rotational motion. The downhill effect method and apparatus may be applied to electrical generating apparatus, rotational power takeoff apparatus, belt driven apparatus and even a wheel.

Abstract: Balanced-drive multiple motors each including an armature rotatably actuated by a field winding. Cross-coupled series excitation of the field windings is accomplished by electrically connecting the field winding of each motor in series with the armature of another motor, thereby balancing the rotational speed of all the motors when unequal loads are applied. A means for adjusting the proportionate speed of the motors is also disclosed.

Abstract: A modular, expandable, low-weight electric motor has a cylindrical, non-magnetic casing formed in axially-aligned sections. The casing sections are releasably connected to define a unitary structure with a polygonal exterior surface and a circular interior surface. Separate U-shaped stator pole assemblies are releasably mounted against the exterior of the casing, each casing section carrying the poles associated with a different motor phase. The poles extend through apertures into the interior of the casing, and have active pole faces which are curved and substantially flush with the circular interior surface of the casing. A modular rotor is mounted in the interior of the casing and carries magnetic elements in axially spaced-apart sets corresponding to each motor phase. The active faces of the magnetic elements are curved and oriented in a cylindrical arrangement.

Abstract: In a rotary pulse motor including: a cylindrical stator made of magnetic material; a cylindrical rotor made of magnetic material and inserted concentrically into the cylindrical stator and being rotatably supported; slit-like grooves formed at a regular angular pitch P/2 in a peripheral portion of the cylindrical rotor, teeth formed between the slit-like grooves permanent magnets inserted into the slit-like grooves and so arranged that polarities of the teeth are alternately inverted; magnetic poles formed at a regular angular pitch in the cylindrical stator facing to the teeth at a constant air gap, and coils provided on the cylindrical stator so as to a generate magnetic flux through the air gap, the cylindrical stator consists of two cylindrical members arranged in the axial direction of the cylindrical rotor and the magnetic-poles include two rows of magnetic poles formed on the cylindrical stator, the magnetic poles in the respective rows being angularly shifted from each other a predetermined pitch of P

Abstract: A rotor of a synchronous motor incorporates a rotor core assembly 14 including a rotor core 10 formed by a lamination of ferrosilicone plates and a plurality of permanent magnets 12 arranged on the outer periphery of the rotor core 10. The rotor core assembly 14 is formed by coaxially connecting a plurality of rotor core units 18 in an axial direction. Each of the rotor core units 18 has an axial dimension enabling the permanent magnets 12 to be magnetized by a normal size magnetizer. Each of the rotor core units 18 includes an auxiliary rotor core 10' formed by a lamination of magnetic thin plates and a plurality of auxiliary permanent magnets 12+ arranged and affixed on the outer periphery of the auxiliary rotor core 10' at predetermined equal pitches in the circumferential direction. Each of the auxiliary permanent magnets 12' has a configuration of an identical curved plate shown by a line-symmetrical isosceles trapezoid in a plan view.

Abstract: A micro electrostatic cooling fan arrangement is provided which includes a heat source having a planar surface, a stator attached to the heat source, an axle attached to the heat source and spaced from the stator, a rotary element including a hub having an aperture therein and a fan blade, the axle passing through the aperture of the hub and the fan blade having a major surface thereof disposed at an angle with respect to the surface of the heat source and attached to the hub at one end, with the other end of the fan blade being adjacent to but spaced from the stator and a voltage source applied to the stator having sufficient voltage to charge the fan blade.

Abstract: This transducer comprises a rotor (18) and a stator (2) having at least three magnetic poles (12a, 12b, 12c) each terminating with a polar lug (24a, 24b, 24c). The polar lugs are connected together by magnetic flux guide branches (8a, 8b, 8c) each bearing an excitation coil (10a, 10b, 10c). The stator is made up from two principal parts (4, 6) situated for the most part in two different planes while the magnetic flux guide branches (8a, 8b, 8c) are situated in a region between such planes. This transducer exhibits a compact structure and may be inexpensively manufactured by simple blanking of the stator parts. In particular it finds application in the driving of small dimension precision mechanisms such as timepieces.

Abstract: A current rectifier-excited synchronous electrical machine includes a rotor defining an axis of rotation. The rotor includes a rotor shaft, a stator housing, and a central disk. The rotor shaft is mounted in the stator housing. The central disk extends radially outward from the rotor and defines an outer circumference. At least one ring-shaped pole structure is secured to the disk outer circumference and disposed coaxial to the axis of rotation. The pole structure includes a plurality of permanent magnets, soft iron elements and insulators. The permanent magnets and soft iron elements are disposed in interleaved fashion. The insulators are formed of magnetically and electrically nonconductive material and are disposed between each of the magnets and iron elements. The magnets, iron elements and insulators are disposed in two side-by-side rows. Each pole structure is opposed by a stator assembly comprising an outside stator and an inside stator.