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: A direct current electric motor having a reduced inertia rotor includes a stator affixed to a housing wherein the stator comprises a plurality of electrically conductive windings. The stator further defines a central cavity in which is mounted a rotor. The rotor comprises a shaft, at least two magnets affixed in a radially spaced manner from the shaft, and a rotor core between the shaft and magnets that is rotationally de-coupled from the shaft and the magnets.

Abstract: A transverse flux drive includes a first component and a second component which is rotatable with respect to the first component. A pair of transverse flux motor units are coupled between the first and second components. Each motor unit includes a plurality of U-shaped armature elements which are coupled to the first component and which enclose an circumferentially extending exciter winding. Each motor unit also includes a plurality of permanent magnet pole elements coupled to the second component. The pole elements of one motor are axially movable to attenuate the magnetic flux coupling between the elements of the motor.

Abstract: A rotational electric machine in which a rotor having different-polarity field magnets arranged alternately in a rotational direction is divided axially into two rotor portions so that the axial position of one of the two rotor portions is changed relative to that of the other in accordance with a direction of torque of the rotor or the phase of synthesized magnetic poles of the field magnets is changed relative to that of magnetic poles of the other rotor portion in accordance with a direction of torque of the rotor, and a vehicle loaded with the rotational electric machine.

Abstract: Embodiments of the present invention are directed to gear transmission apparatus that are configured to largely eliminate the cogging effects and to reduce the backlash effects. In one embodiment, a transmission apparatus comprises a follower gear, a first drive gear set coupled with the follower gear to drive the follower gear, and a second drive gear set coupled with the follower gear to drive the follower gear. The first drive gear set includes at least one gear, and the second drive gear set includes at least one gear. A first motor is coupled with the first drive gear set. The first motor includes a first rotor having a plurality of poles which are movably disposed relative to a plurality of magnets. A second motor is coupled with the second drive gear set. The second motor includes a second rotor having a plurality of poles which are movably disposed relative to a plurality of magnets.

Abstract: A control device for a rotating electrical machine system having a plurality of rotating electrical machines is provided with a single current control circuit and a controller. The controller sets an operating point of at least one rotating electrical machine of the plurality of rotating electrical machines, and sets the current for each rotating electrical machine so that one of the efficiency of the current control circuit and the overall efficiency with respect to all the rotating electrical machines. The controller controls the current control circuit so that the current control circuit supplies a composite current to all rotating electrical machines, the composite current combining the set current for each rotating electrical machine.

Abstract: A first rotor (2) rotating with the first rotation shaft (5) and having magnetic poles, and a second rotor (3) rotating with the second rotation shaft (4) and having a different number of magnetic poles to the first rotor (2) are provided. The first rotation shaft (5) and the second rotation shaft (4) are disposed co-axially and the first rotor (2) and the second rotor (3) are disposed in series in an axial direction. A stator (14) with a plurality of coils (16,16A,16B) is provided on an outer side of the first rotor (2) and the second rotor (3). The plurality of coils (16,16A,16B) generate a rotating magnetic field in synchronism with a magnetic field of the first rotor (2) due to the application of a first alternating current and generate a rotating magnetic field in synchronism with a magnetic field of the second rotor (3) due to the application of a second alternating current.

Abstract: In driving method and system for an electrical rotating machine, the electrical rotating machine comprising two rotors, each rotor being independently driven by means of a compound current generated by a multi-phase inverter, and a stator on which a plurality of stator coils are wound, the respective stator coils are divided into a plurality of groups thereof, a total current sum of each group thereof being zeroed and neutral points of the stators belonging to the respective groups being interconnected and drive pulses are supplied to a plurality of inverter arms of the inverter associated with one group of the stator coils independently of those supplied to other inverter arms of the inverter associated with the other group of the stator coils.

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 control device for a plurality of rotating electrical machines has a single current control device with an inverter, gate driver, and a motor controller, which supplies a control current to each rotating electrical machine allowing rotation control in response to the rotational phase of the rotor. In this control device, the current control device determines the control current of each rotating electrical machine based on the target torques and rotational angular velocities of all rotating electrical machines, and supplies a composite current obtained by combining the determined control currents for each rotating electrical machine to all rotating electrical machine. In this control device for a plurality of rotating electrical machines, the required voltage does not exceed the voltage of the power source and the peak value of the composite current does not exceed the permitted range of the inverter.

Abstract: An electric rotating machine is equipped with a middle core, an outer core disposed outside the middle core which rotates relative to the middle core, and an inner core disposed inside the middle core which rotates relative to the middle core. The middle core comprises plural plates disposed in an axial direction. The plural plates are connected in the axial direction by a connecting member, and joined to a first fixing member. The inner and outer circumferential surfaces are finished in the state where the plates are joined only to the first fixing member, and the opposite side to the first fixing member is joined to a second fixing member after finishing.

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: 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: 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 rotary electric machine for a hybrid vehicle includes a rotor connected between a vehicle engine and a torque transmission mechanism at the back of the vehicle engine and a stator. The rotor includes an outer rotor portion having an inner surface electro-magnetically connected to the outer surface of the stator, an inner rotor portion having an outer surface electro-magnetically connected to the inner surface of the stator. The stator includes a stator core disposed between the inner rotor portion and the outer rotor portion and a multi-phase winding wound on the stator to be electro-magnetically connected with both the outer and inner rotor portions.

Abstract: A system and method is disclosed for the construction of a frameless cartridge motor. In accordance with one embodiment of the present invention a frameless cartridge motor is provided such that the motor's rotor is aligned with the motor's stator, a feedback device is calibrated and attached to the motor via a flexible member, and fasteners fix the rotor to motor's housing.

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: A hybrid drive type vehicle having a permanent magnet type synchronous motor can provide high torque characteristics in low revolution speed range of the engine and high power generation characteristics at high revolution speed range of the engine. The hybrid drive type vehicle includes an electric rotary machine being formed with a stator and a rotor. A field magnet of the rotor include a first field magnet and a second field magnet. The first and second field magnets are opposing with a magnetic pole of the stator and having a mechanism for varying a phase of a magnetic pole resulting from combination of the first and second field magnets relative to the magnetic pole of the first field magnet depending upon direction of a torque of the rotor.

Abstract: The electrical mechanism of the present invention is constructed with two rotating elements and a static element, when normally an electrical machine (generator or motor) is made with one rotor and one stator only. This invention applies a unique concept of rotating magnetic fields integrated with an electronically controlled electromagnetic reaction driver. The result is a very reliable machine, light weight and not very expensive. In addition, the size and weight of the present invention are smaller (compared to devices operating at the same power) than other AC constant frequency generators working at variable speed.

Abstract: A rotary electric machine includes a stator core having a plurality of slots disposed at an inner periphery, an armature winding disposed in the slots and a rotor disposed inside the inner periphery of the stator. The rotor includes a first rotor portion and a second rotor portion, which are disposed magnetically in parallel with each other. The first rotor portion has a plurality of permanent-magnet poles, and a second rotor portion has a plurality of salient induction poles.

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 brushless permanent magnet electric machine with a fixed radial air gap is operated to a much higher speed than normal maximum speed by the reduction in effective magnet pole strength. Increasing the amount of axial misalignment of the permanent magnet rotor and constant velocity bearing proportionally increases the speed and reduces the torque. The permanent magnet rotor is offset axially to provide axial misalignment between the rotor magnet poles and the stator, reducing the effective magnet pole strength or flux to the stator. An integral constant velocity linear bearing is used to couple the movable rotor and the fixed position motor shaft. A thrust bearing is actuated to offset the magnetic rotor against the attractive magnetic forces toward the stator. The use of a constant velocity linear bearing allows the motor shaft, radial support bearings, position encoder, cooling fan, and output coupling to remain in a constant position while rotor position is offset.

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: 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: Specified is an electric motor with a stator (1) that displays a rotating-field-generating rotating-field winding arrangement and a bore (3) in which is arranged a rotor.

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 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: 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: A brushless permanent magnet electric motor with a fixed radial air gap is operated to a much higher speed than normal maximum speed by the reduction in effective magnet pole strength. Increasing the amount of axial misalignment of the permanent magnet rotor and stator proportionally increases the speed and reduces the torque. The permanent magnet rotor is offset axially to provide axial misalignment between the rotor magnet poles and the stator, reducing the effective magnet pole strength or flux to the stator. An integral constant velocity linear bearing is used to couple the movable rotor and the fixed position motor shaft. A thrust bearing is actuated to offset the magnetic rotor against the attractive magnetic forces toward the stator. The use of a constant velocity linear bearing allows the motor shaft, radial support bearings, position encoder, cooling fan, and output coupling to remain in a constant position while rotor position is offset.

Abstract: A non-contact electric power transmission apparatus including a primary unit and a secondary unit. The primary unit includes a primary core and a power primary winding. A signal secondary winding is wound around the primary core and provided to be apart from the power primary winding to form a primary gap between the power primary winding and the signal secondary winding. The secondary unit includes a secondary core and a power secondary winding. A signal primary winding is wound around the secondary core and provided to be apart from the power secondary winding to form a secondary gap between the power secondary winding and the signal primary winding.

Abstract: A permanent magnet type rotating electrical machine capable of reducing core loss due to armature reaction magnetic flux and making an effective use of reactance torque. A permanent magnet type rotating electrical machine comprising a first rotor core containing a permanent magnet and a second rotor core having a flux barrier without magnet, wherein a concave portion is provided between poles in the vicinity of outer surface the rotor core containing the permanent magnet and the length of the gap in the magnetic path on the q-axis side is increased to ensure easy passage of the magnetic path of the armature reaction magnetic flux on the reluctance torque rotor side, whereby a permanent magnet type rotating electrical machine delivering a large output can be obtained by making an effective use of reluctance torque.

Abstract: A permanent magnet type rotating electrical machine capable of reducing core loss due to armature reaction magnetic flux and making an effective use of reluctance torque. A permanent magnet type rotating electrical machine comprising a first rotor core equipped with a permanent magnet stored in a permanent magnet insertion hole, and a second rotor core having a reluctance magnetic circuit, wherein a concave portion is provided between poles in the vicinity of the outer surface of the first rotor core, and a flux barrier constituting the reluctance magnetic circuit of the second rotor core is arranged in a form different from the magnet insertion hole, whereby the magnetic path of the armature reaction magnetic flux is defined, and a permanent magnet type rotating electrical machine delivering a large output is obtained by making an effective use of reluctance torque.

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: 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: 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 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: A double sensing face motor structure includes a base board defining an axial hole, and a plurality of coils mounted around a periphery of the axial hole in an equally spaced annular manner. A sensor member and a start member are mounted on the base board. Two rotors are respectively located on an upper side and a lower side of the base board to integrally combine with each other. Each of the two rotors is provided with a permanent magnet respectively mating with the coils of the base board. One of the two rotors is provided with a central shaft that is rotatably mounted in the axial hole of the base board in a positioning manner.

Abstract: A hybrid drive type vehicle having a permanent magnet type synchronous motor can provide high torque characteristics in low revolution speed range of the engine and high power generation characteristics at high revolution speed range of the engine. The hybrid drive type vehicle includes an electric rotary machine being formed with a stator and a rotor. A field magnet of the rotor include a first field magnet and a second field magnet. The first and second field magnets are opposing with a magnetic pole of the stator and having a mechanism for varying a phase of a magnetic pole resulting from combination of the first and second field magnets relative to the magnetic pole of the first field magnet depending upon direction of a torque of the rotor.

Abstract: A magnetic motion transmission device (10) which comprises a magnetic body (15) which has an outer cylindrical surface and radial end walls, is polarized axially of the cylindrical surface and, at the opposed radial ends of the cylindrical surface, has a pair of disc-like pole plates (14, 16) that are of a like diameter greater than the diameter of the cylindrical surface. The pole plates (14, 16) are mounted axially at the opposed radial ends of the magnetic body by an axle pin (18) of non-magnetic material (e.g. brass). The device (10) serves in use to effect motion transmission between first and second members (11, 12), the second surface being either planar or cyclindrical or frusto-conical.

Abstract: A single-stator-double-rotor rotating motor has one upper-layer rotor, one intermediate-layer armature and one lower-layer rotor. The upper-layer rotor and lower-layer rotor are embedded with the same number of magnets to form a magneto type magnetic pole, stator electrodes of the same number as the number of magnets are disposed on the intermediate-layer armature to form an electro type magnetic pole. A skew symmetry exists between an upper-layer rotor and a corresponding lower-layer rotor, and the upper-layer rotor and the lower-layer rotor are rotated in opposite directions by commutation of the current flowing through exciting coils of the stator electrodes every T/N of time, wherein T is a rotation period of the upper-layer rotor, and N is the number of the magnets.

Abstract: A motor/generator is provided with a stator (14) and rotors (2, 3). The stator (14) comprises a plurality of cores (11, 12) arranged on a circle. Each core (11, 12) has a base (11A, 12A) of a trapezoidal cross-section which increases a width in a direction away from the center of the stator (14). Deformation of the cores (11, 12) towards the center of the stator (14) is limited by retaining plates (18) each of which is engaged with the bases (11A, 12A) of adjacent cores (11, 12). The retaining plates (18) are formed to have a trapezoidal cross-section which increases a width in a direction towards the center of the stator (14). Rings (21, 22) are press fitted to an inner side of the both ends of the retaining plates (18). Preferably a reinforcing ring (25) is provided to support the inner periphery of the retaining plates (18).

Abstract: A machine tool provided with an electric motor which can maintain the fixed output power in a wide speed range. The electric motor has a stator having a primary winding, and a rotor having a field magnet and a shaft, said field magnet comprising a first field magnet having different polarity magnetic poles sequentially arranged in a rotating direction and a second field magnet having different polarity magnetic poles sequentially arranged in a rotating direction, and a mechanism for shifting one field magnet in axial and rotating directions with respect to the other field magnet, whereby a composite magnetic field of said first and said second field magnets is changed.

Abstract: A rotational electric machine in which a rotor having different-polarity field magnets arranged alternately in a rotational direction is divided axially into two rotor portions so that the axial position of one of the two rotor portions is changed relative to that of the other in accordance with a direction of torque of the rotor or the phase of synthesized magnetic poles of the field magnets is changed relative to that of magnetic poles of the other rotor portion in accordance with a direction of torque of the rotor, and a vehicle loaded with the rotational electric machine.

Abstract: A controlling apparatus for controlling a linear oscillation motor includes a sensor and a controller. The motor has a movable element and a stator one of which includes an electromagnet with a winding. The sensor is configured to detect movement of the movable element. The controller is configured to intermittently supply electric power to the winding of the electromagnet to move the movable element reciprocally and linearly. The controller is configured to begin each intermittent supply of electric power to the winding at a timing before a dead center of the movable element based on an output of the sensor.

Abstract: A variable speed motor includes a motor body having an axis, and a plurality of coil mounting parts that extend radially and that are angularly spaced apart relative to the axis. A run coil is mounted on the coil mounting parts. A starting winding includes first, second and third speed-changing coils mounted on the coil mounting parts, a set of first taps provided respectively on two coil terminals of the first speed-changing coil, a set of second taps provided respectively on two coil terminals of the second speed-changing coil, and a set of third taps provided respectively on two coil terminals of the third speed-changing coil. Each of the first, second and third speed-changing coils spans an angular length relative to the axis that is substantially equal to that spanned by the run coil.

Abstract: The present invention discloses a single-stator-double-rotor rotating motor, mainly comprises at least one upper-layer rotor, at least one intermediate-layer armature and at least one lower-layer rotor. The upper-layer rotor and lower-layer rotor are embedded with the same number of magnets to form a “magneto type” magnetic pole, stator electrodes of the same number as the number of magnets are disposed on the intermediate-layer armature to form a “electro type” magnetic pole. The characteristic of the present invention is that a skew symmetry exists between an upper-layer rotor and a corresponding lower-layer rotor, and the at least one upper-layer rotor and at least one lower-layer rotor are rotated in opposite directions by changing the direction of the current flowing through exciting coils every T/N of time, wherein T is a rotation cycle of the upper-layer rotor, and N is the number of the magnets.

Abstract: A system for transferring power between a first electrical system and a second electrical system comprises a rotary transformer (105) comprising a rotor (110) having rotor windings and a stator (112) having stator windings. The windings of at least one of the rotor and the stator are high power cables utilized to obviate employment of a transformer between the one of the rotor and the stator and one of the first electrical system and the second electrical system.

Abstract: Magnetic bodies for reducing electromagnetic wave noises are mounted to a battery voltage supplying terminal for supplying of an electric source power for the operation of circuits to an IC chip of a regulator or an internal electric source line for connection of the terminal to the regulator chip. The magnetic bodies are attached to an IG ON terminal for inputting into the regulator chip a voltage signal caused by opening and closing of an ignition switch or to an IG ON detection line for connection of the terminal to the regulator chip. A bypass capacitor is connected to a battery voltage detecting terminal for inputting a change of battery voltage into the regulator chip, or to an internal battery voltage detection line for connection of the terminal to a switching transistor control circuit unit.

Abstract: A multiple impeller flow inducing device in which driver coils are intermittently energized in timed relation to rotation of the impellers to interact with permanently magnetized portions of the impeller to rotate the same. The impellers can be rotated in opposite directions or in the same direction. A two section impeller construction allows each section to be magnetized in opposite pole orientation and when assembled creating alternate pole orientations of successive portions, arcuate segments forming a shroud or the type of blades can be magnetized to provide the impeller magnetized portions. Stator guide vanes can be interposed between successive impellers.