Abstract: A rotor disc for use in an electrical machine has circumferential rotor rims mounted thereon. The rotor rim comprises a row of alternate magnets and pole pieces. The magnets are tapered at their radially inner and outer extents and engage with correspondingly tapered surfaces on adjacent pole pieces to prevent relative physical movement therebetween.Each side of the radially inner and outer extents of the magnets may be tapered by a different amount to ensure correct orientation of the magnet polarity.

Abstract: A bicycle generator including a coil stator and a magnetic rotor. The coil stator includes a planar support, and an induction coil portion formed by a plurality of series-connected coil units which are evenly spaced along the circumference of the planar support. The magnetic rotor is rotatable relative to and substantially parallel to the coil stator, and includes a permanent magnet having a plurality of magnetic pole pairs formed on its circumference. The number of coil units in the induction coil portion is equal to the number of magnetic pole pairs in the magnetic rotor, and the coil units is winded into trapezoid or sector shape, and the span angle of each of the magnetic pole in the magnetic rotor is substantially equal to the span angle of each of the coil units in the coil stator. Alternatively, the bicycle generator may comprises a cylindrical coil stator and a cylindrical magnetic rotor.

Abstract: A slim-line direct current (DC) brushless motor for automotive and HVAC applications utilizes a single contact bearing assembly to rotatably couple an exterior rotor to an interior stator. The rotor includes a flat permanent magnetic and the stator assembly includes a flat coil. The flat coil is made from a stamped copper member. The rotor is staked to the bearing assembly by a hub-shaft. The lone contact bearing can be a double horizontal row contact bearing, a four point contact bearing, or a closed cylindrical roller bearing. A cooling fan is disposed on the top of the rotor to cool internal control circuitry within the motor. The motor is easily assembled and has a minimal number of moving parts.

Abstract: The elevator machinery (26) comprises a motor (6) and its traction sheave (18). The rotor (17) is disc-shaped and air gap (ag) between it and the stator (14) can turn a plane which is substantially perpendicular to the shaft (13). The stator (14) forms a ringlike sector (28) and is placed in an outer part and the traction sheave (18) is fixed to the rotor, between the stator (14) and the shaft (13). The diameter of the traction sheave is smaller than that of the rotor. The structure of the motor allows the use of traction sheaves (18) of different diameters (2*Rv) with rotors (17) of the same diameter. The motor is very flat. In other words, its length in the axial direction is small.

Abstract: Known conductor lanes which can be set into the grooves of linear motors or disk armatures, do not sufficiently occupy the space available in the grooves and winding overhang in multiphase machines, and thus increase the volume and weight of the machines. For high power and force densities, the conductor lanes should allow the available space to be fully occupied. The number of the different conductor lane designs should be minimized in order to reduce production costs. According to the invention, the conductor lanes (13-16) which are prefabricated in a single piece are being led past each other in the overlapping zones in the direction of the groove depth, so that the conductor cross-section is variably adapted to the available space. By using pairs of conductor lanes (13, 14) without loops and mutually offset by one pole pitch in a groove, a high utilization of the space available in the winding overhangs and short conductor lengths are achieved.

Abstract: In a valve actuator arrangement for an internal combustion engine, a valve structure having a valve body and a rotary valve axle is provided, an electric motor structure having a generally disc shaped body fixed on one end of said valve axle so as to be integrally pivoted with the valve axle is provided, a permanent magnet fixed on the disc-shaped body is provided, a fixing member fixed on the one end of the valve axle is provided, and a pair of windings to form a pair of coils whose winding directions are mutually opposite to each other are wound around the fixing member so that a direction of a magnetic flux developed between each of the pair of windings and the permanent magnet is parallel to the valve axle.

Abstract: Spindle motor electrical- and motor-to-base interfaces. A compliant connector along with a circuit on a support flange is provided below a stator assembly for providing: An insertable spindle motor to drive base with less specific orientation. The support flange may comprise a small printed circuit cable or a printed circuit board. Additionally, non-specific orientation of a spindle motor to drive base assembly is described using circular traces oriented about a support flange. A circular connector is also described, as a biased support flange.

Abstract: Damper winding (13) for an elevator motor provided with permanent magnets (14). The damper winding consists of frames (16) surrounding each permanent magnet (14). Each one of the frames is electrically connected to the adjacent frame (16) or the frames are integrated together. The damper winding (13) can be used as a jig for positioning the magnets when these are being fixed to the rotor disc (6). In one of the embodiments, the magnets and damper winding are fixed to the rotor disc by a form-fit interlocking arrangement.

Abstract: An electric motor is capable of increased output torque by utilizing both electric energy by an electromagnet and a magnetic energy by a permanent magnet. The electric motor includes a wobble rotor made of a magnetic material including at least one permanent magnet arranged annularly in a circumferential direction therein. A plurality of electromagnets are disposed annularly along with the outer periphery of the rotor. Current switching circuitry energizes the electromagnets in a predetermined sequence and timing. The wobble rotor is supported by a supporting mechanism around a center portion thereof in a pivotally movable manner and is capable of closely approaching or contacting an energized electromagnet at the outer periphery thereof and of wobbling movement with a certain incline toward the energized electromagnet according to the predetermined sequence and timing of the energizing of the electromagnets.

Abstract: An electric disk armature machine is disclosed which comprises a drive shaft for the transmission of power from and to the rotor of an electric disk armature machine and which has at least one driver disk vertical to the shaft axis for a positive and/or frictional connection with the rotor. The rotor is a self-supporting construction of a plurality of plate-like coil elements which are distributed along the circumference and which are interconnected radially outside and radially inside so as to conduct. The commutator is formed by an annular portion of one end side of the rotor and an insulating layer is arranged between the rotor and the drive shaft. The electric disk armature machine also comprises a rotor which contains a plurality of current conducting coil elements which are turned relative to one another in their radial angular position and which are insulated relative to one another and arranged in one or more different planes vertical to the rotor axis.

Abstract: An open stator axial flux asynchronous induction electric motor has an open stator having two spaced insulating supports with a slot extending from a periphery of each of the supports to an inner location. A plurality of poles extend between and are secured to the supports. The stator has either distributed winding or salient phase pole windings associated with at least some of the poles with an opening between adjacent poles in the regions of the slots in the supports. The motor has a rotor with a shaft extending through the slots and at right angles to the supports. Two spaced rotor discs are present on the shaft and are located at either side of the stator. Each disc is made of a magnetically permeable material and has either an inner face of electrically conductive material or an inner face with conductive paths which function as rotor windings.

Abstract: A rotor is formed by a rotary frame 3 composed of a nonmagnetic material, a field magnet 5, a yoke 4 and an auxiliary yoke 7. A disk 12 is mounted on the rotary frame 3. An opening 4b is formed in the yoke 4 to thereby cause attractive magnetic flux from the field magnet 5 to effectively act on a clamping yoke 13 of the disk, so that the disk 12 can be firmly clamped. The yoke 4 covers the circumferential part of the field magnet 5 on its disk 12 side to thereby cut off magnetic flux leakage toward the disk 12, so that its adverse effect on the recording surface of the disk 12 can be avoided. The auxiliary yoke 7 so arranged that a stator coil 6 is interposed between the auxiliary yoke 7 and the field magnet 5 is secured to the rotary frame 3 to thereby increase effective rotating magnetic flux so that output torque is increased.

Abstract: An electrical generator (1) comprising first and second relatively rotatable winding assemblies (5,8), the first winding assembly (5) having a first electrical output for connection to a first electrical load (4) and the second winding assembly (8) having a second electrical output for connection to a second electrical load (6 or 19), and a permanent magnet assembly (12) freely rotatably mounted between the winding assemblies (5,8) such that, in use, rotation of the winding assemblies (5,8) relative to the permanent magnet (12) assembly induces a current in both winding assemblies. A third winding assembly (19) may rotate with the second winding assembly (8) relative to a fourth winding assembly (20) that rotates into the first winding assembly (5). The third winding assembly 19, may comprise said second electrical load, and the fourth winding assembly (20) may be connected to a fourth electrical load (22,23). The first and fourth electrical loads (4,22,23) may be de-icing elements on a propeller.

Abstract: A flat vibration generating apparatus wherein a flat coreless eccentric vibrator armature generates an eccentric vibration desired from the aspect of body feel. An air-core armature coil group thereof consists of m pieces (where m is an integer of 3 or more) of armature coils disposed in superposition with one another in m phases in an arrangement such that they are eccentric and with their phases deviated in a circumferential direction, and that they do not describe a complete disc-like shape as viewed from the axial direction.

Abstract: A spindle motor includes a printed wiring board. A stator is fixed to the printed wiring board. A housing is fixed to the printed wiring board. A bearing is provided on the housing. A rotor shaft is rotatably supported by the bearing. A hub base is mounted on the rotor shaft. A stator winding provided on the stator is bonded to the printed wiring board. The stator may have an inner circumferential portion formed with a plurality of grooves. In this case, it is preferable that the printed wiring board has a plurality of through holes at positions corresponding to positions of the grooves in the stator.

Abstract: An electric motor-generator has a rotor (1), a stator including soft ferromagnetic cores (3, 5) and coils (4, 6), permanent magnets (2) having pole axes in a plane radial to an axis of rotation of the rotor, means for mounting the magnets, the cores and coils to the rotor and stator, and means for energizing the coils. The rotor is caused to rotate by attraction of the magnets to the cores (5) as the magnets and cores approach one another, an opposite attraction force between the magnets and the cores being neutralizeable by energizing the coils (6) as the magnets and cores move apart. The cores are C-shaped and a magnetic circuit is formed when the magnets and cores are in proximate alignment.

Abstract: An apparatus for generating electrical energy includes at least one fixedly mounted stator having a generally cylindrical cross-section and further including an inner periphery and an outer periphery. The apparatus additionally includes a rotor which is mounted for rotation relative to the stator about an axis. A plurality of field windings is mounted to the stator to extend about its periphery preferably in a serpentine manner. Further, the apparatus includes first and second groups of permanent magnets. The first group of permanent magnets is mounted to the rotor and is axially arranged about the axis such that the first group of magnets faces the inner periphery of the stator. The second group of magnets is mounted to the rotor and is arranged about the axis such that the second group of permanent magnets faces the outer periphery of the stator.

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, the 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: The present invention resides in an improved disc-type, electrical machine having enhanced efficiency and effectiveness. The disc-type, electrical machine comprises a housing unit, a stator connected to said housing unit, a shaft rotatably connected to the stator or housing unit with rotation means, a rotor connected to the shaft wherein the stator surface area and the rotor surface area which are juxtaposed to each other are serrated, thus producing increased magnetic flux areas. The larger surface areas improves heat transfer from the unit's interior and lowers the magnetic flux density between the stator and rotor.

Abstract: Disclosed herein is a modular motor comprising a discoidal stator unit and a discoidal rotor unit rotatable about an axis of rotation under a torque established therein, the stator unit being supported by a frame arrangement and having a winding assembly within in a matrix of polymer material, the winding assembly including a number of winding elements, each of the winding elements having a pair of radially disposed portions, wherein at least one of the radially disposed portions of each winding element is spaced from a radially disposed portion of another winding element to form a cooling region therein, the cooling region being arranged for the location therein of thermally conductive materials having a thermal conductance of at least 1.5 w.multidot.cm/(cm.sup.2 .multidot..degree. C.), thereby to transfer heat from the stator unit and toward the frame arrangement during operation of the motor.

Abstract: A stator wound resolver comprising: a stator and a rotor aligned on an axis; the stator having a plurality of teeth with input and output windings disposed on some or all of the teeth, the input and output windings exhibiting a mutual inductance characteristic that varies as a function of position of the rotor about the axis; the input winding being connectable to a drive signal and the output windings being disposed on the teeth such that output signals induced in the output windings correspond to position of the rotor; the rotor being attachable to a position changing means, the rotor comprising at least two axially spaced rotor pieces that are offset from each other by a stagger angle such that a portion of harmonic distortion produced by one of the rotor pieces is reduced by complementary harmonic distortion produced by another of the rotor pieces.

Abstract: The invention relates to an axial-flow induction motor comprising a stator having a winding arranged in a slot and a rotably supported laminated rotor which is spaced from the stator by an air gap. The rotor has a magnetically highly conductive layer on the side which is remote from the stator and an electrically highly conductive layer on the side which faces the stator. In order to reduce losses caused by harmonics, the rotor also includes an additional magnetic conductive layer between the electrically highly conductive layer and the air gap. The magnetic conductivity of the additional magnetic conductive layer in the direction of rotation is low in comparison with the magnetic conductivity of the magnetically highly conductive layer. The electrically highly conductive layer is also thicker than the magnetically conductive layer.

Abstract: A motor comprising a rotor unit and a stator unit. The rotor unit includes a multipolar rotor magnet; a gear, disposed away from the center of rotation of the rotor unit with respect to the rotor magnet, for transmitting torque of the rotor unit to the outside; and a rotary shaft disposed at the center of rotation. The stator unit includes a substrate; and a plurality of coils disposed facing the rotor magnet on the substrate, the substrate having a cut-out section between at least two of the plurality of coils, with the cut-out section causing the outer peripheral section of the gear to be exposed.

Abstract: A device for converting magnetic force to mechanical force including a member having an axis about which it is rotatable, the member having a peripheral edge portion formed of a material that is effected by the presence of a magnetic force adjacent thereto, at least one magnetic member positioned adjacent the peripheral portion of the rotatable member to produce a magnetic coupling force therebetween, the peripheral portion of the rotatable member having a shape such that the magnetic coupling between the magnetic member and the peripheral portion of the rotatable member varies continuously as the rotatable member rotates.

Abstract: An axial gap type electric motor includes a stator assembly having a plurality of stator coils fixed to a circuit board and a rotor assembly having a rotor magnet supported via a dynamic pressure gas bearing on the stator assembly. The stator coils are enclosed by a molding material into a single block. An upper face of the block opposed to the rotor magnet is rendered flat. Since the block of the stator coils has no irregularities that cause turbulent flows of air, flows of air flowing through a gap between the rotor magnet and the stator coils are rendered laminar. Consequently, windage loss can be reduced.

Abstract: A motor includes a stator core having a plurality of projected poles, a stator coil wound around an insulating portion of the stator core, a printed circuit board for supplying electricity to the stator coil, and a holder having a hollow projection and fixed to the stator core. The projection of the holder is inserted and fixed in a hole formed in the printed circuit board and is used for positioning and fixing the stator core. A portion of the projection of the holder has a hole. A terminal pin is fixed in the hole of the projection of the holder and has a step portion around which the stator coil is. The step portion is fixed to a solder land of the printed circuit board to be wired to the stator coil so as to make the terminal pin and the land electrically conductive.

Abstract: Disclosed is a Segmented Coil Array ("SCA") for use in rotary electromotive devices, such as motors and generators, which employ multiple coils operating within an axial gap magnetic structure. Individual conductor coils have offset circumferentially extending portions so as to allow interlocking of adjacent coils radially extending portions to form a circular array in which all of the coils' working conductors, which are those in the axial magnetic field, can be oriented in the same plane. This construction allows minimum magnet gap spacing, thus, maximizing the available magnetic flux. The resulting SCA may easily be commuted as a three-phase motor, actuator, or generator. The invention also provides a structure whereby multiple coil arrays and associated magnetic rotors may be alternately stacked in layers so as to further increase the total coil working area within a motor or generator of a given diameter.

Abstract: A multiphase and multipole electrical machine which can be commutated electrically is disclosed. The machine includes a rotor and a stator. The stator has multipole poles divided into zones, each zone corresponding to a respective phase of the machine. A winding conductor is associated with each phase, the conductor being passed in alternating directions around successive stator poles of the corresponding zone. Adjacent stator poles are spaced by a slot width substantially corresponding to the width of the winding conductor, portions of the winding conductor within a slot overlapping one another radially of a longitudinal axis of the stator.

Abstract: A three-phase reluctance type motor flat in shape and capable of generating a large output torque and rotating at high speeds, comprising a flat stationary armature (16) having a circumferential surface provided with three multiplied by integral number of magnetic poles wound by first, second and third phase armature coils, salient poles of a magnetic rotor (1) fixed to the inside of the outer periphery of a cup-shaped rotor (3), and a current supply control circuit for obtaining first, second and third phase position detecting signals responsive to the position of the salient poles and for quickly supplying current to the first, second and third phase armature coils based on these position detecting signals, so as to realize a high-speed rotation.

Abstract: A magnetic bearing and positioning system provides a radial actuator for positioning a shaft without mechanical contact between the actuator and the shaft. As disclosed, the actuators use a homopolar structure without slots between the poles and with the poles of the magnetic bearing being at the same polarity at a given axial position, thereby advantageously reducing hysteretic and eddy current losses in the rotor material.

Abstract: An induction machine having ferromagnetic conducting material in the rotor is disclosed. The machine may be used as a motor, an alternator, a generator, or an alternator/starter. The machine includes a first stator and a second stator in a symmetrical mirrored relationship to the first stator such that a gap is defined intermediate the first and second stator. A disk-shaped rotor is disposed in the gap. The rotor is substantially comprised of ferromagnetic material electrically conducting in the radial direction and may include copper bars or rings embedded within the rotor.

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: 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: An improved method and servo control apparatus (C) is provided for controlling the motion of a linear electric motor (A) which in turn generates motion command signals to various apparatus such as a hydraulic steering system (B). Preferably, the servo control apparatus (C) includes a power supply circuit (60), a servo amplifier circuit (62), a pulse width modulation circuit (64), an H-bridge drive circuit (66) and an inductive position sense circuit (68). The voltage at a node (42) between coil pairs (38, 40) in the motor (A) is sensed and synchronously demodulated using transmission gates (222, 224) to develop a DC signal representative of armature (30) position from a center location. The signal on a current shunt resistor (200) is synchronously demodulated by transmission gates (208, 209)to generate a signal, the phase of which is determined with respect to the motor drive signal. The phase signal directly indicates whether the armature is off center towards drive coil 38 or drive coil 40.

Abstract: The invention relates to a rotationally symmetrical.sup.1 magnetic bearing cell (1) with a rotor (2) arranged to rotate about the central axis (10) of the cell (1) and having a shaft (4) and at least two axially magnetised permanent magnetic rings (5, 6, 30) fitted an axial distance apart on the shaft and with a stator (3) having pole components (12, 13, 16, 17) and two annular coils (14, 15) associated with the rotor end faces; to improve the radial rigidity without increasing active control complexity, it is proposed that pole components (26, 27, 38) of magnetically conductive material be provided for the peripheral regions of the two axially outer permanent magnet rings (5, 6 or 5, 30) to direct the magnetic flux generated by the annular coils (14, 15) into two substantially independent magnetic flux circuits (28, 29)..sup.1 Translator's: note The German text reads "aufgebautet". This is grammatically not correct. Instead the German text should read "aufgebaute".

Abstract: An alternator includes a flywheel for storing kinetic energy. A motor generator, which includes permanent magnets mounted to a rotor, receives electrical power for accelerating the rotor to a high rotational velocity to store kinetic energy. The rotor is provided with coils, and each coil is connected to first and second conductors. The exterior portion of the rotor comprises the flywheel. Stator coils are mounted adjacent to coils of the rotor and electrical power is produced within the stator coils. The kinetic energy stored in the rotor flywheel can be transformed to electrical power through a first output which is the coils of the motor generator and can produce a second electrical output through the stator coils of the alternator. The primary application of such a dual power alternator is to produce a high power pulse for an electromagnetic gun, and to also provide averaging power to supplement the power from the main drive engine of a vehicle.

Abstract: In a capstan motor, a gear portion and an FG detection portion are integrally formed of a plastic magnet at mutually different wall thicknesses and they are fixed to the outer circumference of a rotor yoke. The FG detection portion is provided with multipolar magnetization to generate a rotation detection signal with a magnetoresistance element. The gear portion is arranged to transmit the drive force to the outside. The outer diameter of the rotor yoke is different at the gear portion and at the FG detection portion, depending upon the wall thicknesses of the plastic magnet. The outer diameter is set to be greater in the portion corresponding to the FG magnet of the rotor yoke.

Abstract: An electric motor which is capable of changing an output torque with a simple arrangement without using an expensive power unit for controlling the supply of voltage (current) to an armature. The electric motor has a motor section constituted by an armature, a first pole piece, and a second pole piece, and has a slide bevel gear which meshes with a bevel gear of an input shaft. The slide bevel gear moves in an axial direction in correspondence with the steering torque, which movement is transmitted to the second pole piece by a pressing lever to rotatively move the second pole piece. Consequently, the opposing positions of poles of the first pole piece and the second pole piece are relatively changed to change polarities, so that a driving force corresponding to the steering torque is outputted.

Abstract: A hybrid-type stepping motor has coils on stator yokes mounted on a fixed shaft or coils wound on the inner circumferences of stator yokes. This hybrid-type stepping motor is easy to coil wind, offers a substantially high density of coils, and achieves a reduction in cost. The use of sub flat magnets and sub magnetic plates on both sides of a stator yoke body allows magnetic circuits to form on both sides of the stator yoke body. This arrangement results in an increase in torque. Additionally, multiple-phase motor is easily constructed.

Abstract: An oscillatory drive incorporating the invention includes a driven rotor that is mounted on a shaft and includes plural driven permanent magnets disposed thereon. A spring arrangement is coupled to the driven rotor and limits both clock-wise (CW) and counter-clockwise (CCW) rotation thereof. A first driving rotor includes first driving magnets, is mounted for rotation on the shaft and is positioned to a first side of the driven rotor. A second driving rotor includes second driving permanent magnets, is mounted for rotation on the shaft and is positioned to a second side of the driven rotor. The drive mechanism imparts a CW rotation to the first driving rotor and a CCW rotation to the second driving rotor. The first driving permanent magnets coupling to the driven permanent magnets causes a CW rotation of the driven rotor until the spring arrangement terminates the CW rotation and causes a reversal of rotation direction in the CCW direction.

Abstract: An axial gap rotary electric machine in which the conduction path design for disc-shaped armatures is specifically matched to the configuration of the axial magnetic field. The design achieves an axial gap rotary electric machine which is light in weight and capable of high power density per unit weight. The design can be used as an electric generator or an electric motor.

Abstract: An electrical generator has a plurality of C-shaped stator members which are made of magnetically permeable material. Each C-shaped stator member includes a respective stator winding, and the stator members are positioned such that the ends of the members form first and second planar rings of equal diameter to establish a gap therebetween. A flat, ring-shaped rotor defines a periphery, and a plurality of permanent magnets are positioned around the periphery. The rotor is positioned with the magnets of the rotor disposed in the gap defined by the stator members. Consequently, when the rotor is rotated by a prime mover to move the magnets through the gap, an electrical current is induced in the stator windings.

Abstract: A flat brushless motor of small size comprising:a thermally conductive base member;a plurality of motor coils fixedly attached to said base member; anda rotor assembly mounted proximately to said plurality of motor coils said motor assembly having a multiple pole permanent magnet incorporated therein.

Abstract: A slim-line direct current (DC) brushless motor for automotive and HVAC applications utilizes a sleeve bearing assembly to rotatably couple an exterior rotor to an interior stator. The rotor includes a flat permanent magnetic and the stator assembly includes a flat coil. The flat coil is made from a stamped copper member. The rotor is staked to the bearing assembly by a hub-shaft. A cooling fan is disposed on the top of the rotor to cool internal control circuitry within the motor. The motor is easily assembled and has a minimal number of moving parts.

Abstract: A cooling apparatus is provided for an AC generator, particularly for a transverse-flow generator having a stator with at least one armature winding, as well as a rotor disposed opposite the armature winding. Collector rings are secured to a carrier disk attached to a rotor shaft. The collector rings have a plurality of polarized magnets and magnetizable collector elements in alternating sequence disposed therein. At least one cooling channel through which a coolant can flow is provided in the vicinity of the carrier disk. The cooling channel is separated from the carrier disk only by a channel cover which has a minimal thickness and by the air gap between the rotor and the stator.

Abstract: The elevator machinery (26) comprises a motor (6) and its traction sheave (18). The rotor (17) is disc-shaped and air gap (ag) between it and the stator (14) can turn a plane which is substantially perpendicular to the shaft (13). The stator (14) forms a ringlike sector (28) and is placed in an outer part and the traction sheave (18) is fixed to the rotor, between the stator (14) and the shaft (13). The diameter of the traction sheave is smaller than that of the rotor. The structure of the motor allows the use of traction sheaves (18) of different diameters (2*Rv) with rotors (17) of the same diameter. The motor is very flat. In i.e. other words its length the axial direction is small.

Abstract: A discoidal dynamo-electric machine has a discoidal stator carrying a number of meandering copper windings imbedded in a substrate having a magnetic permeability of less than 20 relative to air, and a discoidal rotor mounted on a central shaft so that the rotor can be positioned close to and rotates in a plane parallel to that of the stator. The rotor has a circular array of permanent magnets mounted on a backing plate of mild steel, each of the magnets having a trapezoidal or a truncated sector of a circle shape, the magnets being closely spaced around the rotor to provide a series of closely apposed and alternating permanent magnetic poles.

Abstract: A stator includes a frequency generating pattern, a driving coil composite pattern and lead lines. A rotor includes a frequency generating pattern, a driving coil composite and lead lines. A rotor includes a rotor magnet. A separation angle formed by the lead lines is an angle obtained by multiplying an integer and an separation angle formed by a pair of S-pole and magnetic poles of the rotor magnet adjacent to each other. Further, assuming that that an area between the lead lines and U-phase coils produce overlapping areas Su.sub.1 and Su.sub.2 in a top view, that the same area and a V-phase coil produce an overlapping area Sv.sub.1, and that the same area and a W-phase coil produce an overlapping area Sw.sub.1, the relationship Su.sub.1 +Su.sub.2 :Sv.sub.1 :Sw.sub.1 =1.0:1.0:1.0 exits. With this arrangement, the lead lines are least affected by the rotor magnet and the driving coil composite.

Abstract: An axial air gap motor comprising a housing having a first endplate and an opposed second endplate, a stator assembly mounted within the housing, and a rotor assembly rotatable mounted within the housing. The rotor assembly includes an annular disc shaped armature, wherein the armature includes a front facing surface and a rear facing surface. Additionally, the stator assembly includes a first magnetic permeable flux return plate secured to the first endplate and a magnet assembly secured to the first flux return plate. The magnet assembly is positioned between the first flux return plate and the front facing surface of said armature for directing a magnetic field to said armature in a direction normal to a plane of said armature. The stator further including a magnetic permeable second flux return plate secured to the second endplate.

Abstract: A compact motor mount for cassette drive systems includes a base plate in the form of a laminate that includes at least one planar layer of ferromagnetic material sandwiched between two printed circuit boards. A capstan motor is supported by the base plate. The stator coil assembly of the capstan motor is mounted on one side of the base plate directly on one of the two printed circuit boards. At least one winding drive motor also is supported in common with the capstan motor by the base plate. The stator coil assembly of the drive motor is mounted on the other side of the base plate directly on the second of the two printed circuit boards. Each of the motors has a permanent magnet rotor mounted on a shaft and facing the respective stator coil assemblies across an air gap defined therebetween.