Abstract: A permanent magnetic type electric rotating machine includes: a stator having armature winding arranged in several slots formed in a stator core; and a rotor having permanent magnets held in several permanent magnetic insertion holes formed in a rotor core, in which a peripheral surface of the rotor core is configured to be a combination of arcs around two points different from a center of the rotor core for each magnetic pole in such a manner that when an axis extending in a central direction of a magnetic pole of the rotor is a d axis, and an axis extending in a direction between magnetic poles that is offset from the central direction of the magnetic pole by 90 electrical degrees is a q axis, a radial distance from a center of the rotor core to a periphery of the rotor is reduced gradually from the d axis to the q axis.

Abstract: A permanent magnetic type electric rotating machine includes: a stator having armature winding arranged in several slots formed in a stator core; and a rotor having permanent magnets held in several permanent magnetic insertion holes formed in a rotor core, in which a peripheral surface of the rotor core is configured to be a combination of arcs around two points different from a center of the rotor core for each magnetic pole in such a manner that when an axis extending in a central direction of a magnetic pole of the rotor is a d axis, and an axis extending in a direction between magnetic poles that is offset from the central direction of the magnetic pole by 90 electrical degrees is a q axis, a radial distance from a center of the rotor core to a periphery of the rotor is reduced gradually from the d axis to the q axis.

Abstract: There is provided a linear motor, having an armature and a needle with magnetism, in which the armature has at least a magnetic pole of a first polarity having a first opposed part and another magnetic pole of a second polarity having a second opposed part; the needle is held by the first opposed part, and is further held by the second opposed part; and a distribution of magnetism of the needle according to a position in the movable direction thereof. In this way, a leak of a magnetic flux from pole teeth passing between the pole teeth of the armature is decreased to increase a thrust and braking force of the needle, which is thereby enabled to generate a greater or smaller thrust in a specific section or sections than the thrust during usual linear movement.

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: Reduction of cogging torque and torque pulsation in the rotor with permanent magnets embedded therein. In a rotating electrical machine comprising a stator 5 with an armature winding wound on the stator core and a rotor 1 with permanent magnet 2 embedded in the rotor core 9, a magnetic flux short circuit preventive hole 3 radially extending from the circumferential ends of the permanent magnets 2 (in the vicinity of q-axis) to the vicinity of outer periphery of the rotor core is further extended toward the d-axis (circumferential direction). At the same time, the distance between the outer periphery of the magnetic flux short circuit preventive hole 3 and that of the rotor core is increased gradually in conformity to the approach to d-axis side from q-axis.

Abstract: In a permanent magnet type rotating electric machine comprising a stator of which concentratedly wound armature windings are disposed in a plurality of slots formed in a stator core so as to surround teeth and a rotor accommodating permanent magnets in a plurality of permanent magnet insertion holes formed in a rotor core, a part of outer circumferential faces of slots is formed to extend substantially in parallel with a part of inner circumferential faces of the teeth, thereby, a permanent magnet type rotating electric machine with limited noises can be realized.

Abstract: A vehicular alternator is provided which can effectively utilize the magnetic flux of a permanent magnet disposed between claw-type magnetic poles and can improve an output of the alternator. The vehicular alternator comprises a rotor and a stator constituted by coiling stator windings over a stator core, the rotor comprising a pair of claw-type magnetic poles arranged in an opposed relation, a permanent magnet disposed between adjacent two of a plurality of claws provided on the pair of claw-type magnetic poles, and field windings coiled radially inward of the plurality of claws. Each of the plurality of claws of the rotor is formed to have a shape coming into contact with the whole of a magnetic pole surface of the permanent magnet.

Abstract: The invention provides an oscillating type beauty device provided with a plurality of tools. The oscillating type beauty device has an oscillating type motor for oscillating a movable element with respect to a stator. The oscillating type motor has a plurality of movable elements corresponding to movable blades in each of the tools. A plurality of movable elements are set to be driven by a stator.

Abstract: There is provided a linear motor, having an armature and a needle with magnetism, in which the armature has at least a magnetic pole of a first polarity having a first opposed part and another magnetic pole of a second polarity having a second opposed part; the needle is held by the first opposed part, and is further held by the second opposed part; and a distribution of magnetism of the needle according to a position in the movable direction thereof. In this way, a leak of a magnetic flux from pole teeth passing between the pole teeth of the armature is decreased to increase a thrust and braking force of the needle, which is thereby enabled to generate a greater or smaller thrust in a specific section or sections than the thrust during usual linear movement.

Abstract: A superconducting bearing device comprises an annular permanent magnetic portion 2 disposed concentrically with a rotary body 1 in the form of a vertical shaft, and superconductors 8 opposed to the lower end face of the magnet portion 2 and vertically spaced apart therefrom. The permanent magnet portion 2 comprises a disk 4 fixedly mounted on the rotary body 1, and annular permanent magnets 6a, 6b arranged on the disk 4 at a spacing radially of the rotary body 1. Each of the magnets 6a, 6b has upper and lower ends magnetized to polarities opposite to each other, and the adjacent magnets 6a, 6b are magnetized to polarities opposite to each other at the upper ends, as well as at the lower ends. The radial spacing between the magnets 6a, 6b is optimized in accordance with the radial dimension (width) of the magnets 6a, 6b.

Abstract: A superconducting bearing device comprises a permanent magnet portion fixedly mounted on a rotary body concentrically therewith, and a superconductor opposed to the magnet portion and spaced apart therefrom radially of the rotary body, the magnet portion being so disposed that the rotation of the rotary body does not alter the magnetic flux distribution around the axis of rotation of the rotary body, the superconductor being disposed at a position which is spaced apart from the magnet portion by a distance permitting a predetermined quantity of magnetic flux thereof to penetrate into the superconductor and which does not permit the rotation of the rotary body to alter the penetrating magnetic flux distribution. The magnet portion comprises a plurality of annular permanent magnets arranged at a spacing along the axis of rotation of the rotary body and an annular yoke of ferromagnetic material interposed between each two adjacent magnets.

Abstract: A superconducting bearing device comprises an annular permanent magnet portion disposed concentrically with a rotary body in the form of a vertical shaft, and superconductors opposed to the lower end face of the magnet portion and vertically spaced apart therefrom. The permanent magnet portion comprises a disk fixedly mounted on the rotary body, and annular permanent magnets embedded in the disk at a spacing radially of the rotary body. Each of the magnets has upper and lower ends magnetized to polarities opposite to each other, and the adjacent magnets are magnetized to polarities opposite to each other at the upper ends, as well as at the lower ends. The radial spacing between the magnets is optimized in accordance with the radial dimension (width) of the magnets. This improves the device in load capacity and rigidity and prevents the deflection of axis of the rotary body, enabling the bearing device to support the rotary body in a noncontact state with good stability.

Abstract: A magnetic bearing device comprises a radial magnetic bearing having a plurality of radial electromagnets for contactlessly supporting a rotary body radially thereof, a radial displacement detector for detecting the radial displacement of the rotary body, and a radial PID control circuit for controlling drive current for the electromagnets based on a radial displacement signal from the detector. The device further comprises a negative feedback circuit for negatively feeding back the output signal of the control circuit to the input of the control circuit via a notch filter.

Abstract: A superconducting bearing device includes a permanent magnet on a rotor, with a superconductor placed opposite the magnet. Flux trapped in the superconductor during cooling helps to stabilize the rotor. More specifically, the permanent magnet is mounted on the rotor so that, as the rotor rotates, its rotation does not alter the magnetic flux distribution around the axis of rotation of the rotor. The superconductor permits penetration of the magnetic flux from the magnet, being spaced from the magnet by a distance that permits a predetermined quantity of the magnetic flux to penetrate it, while not permitting rotation of the rotor to alter the distribution of the penetrating magnetic flux.

Abstract: A superconducting bearing device for supporting a rotary shaft (rotary body) 2 in a noncontact state for rotation at a high speed. A superconducting bearing 4 for supporting the rotary shaft 2 in a noncontact state relative to a housing 1 comprises permanent magnets 14 mounted on the rotary shaft 2, and Type II superconductors 17 attached to the housing 1 and opposed to the magnets as vertically spaced apart therefrom. A mechanical catcher bearing 21 comprising a thrust ball bearing is disposed between the housing 1 and the rotary shaft 2 at opposed portions thereof. An initial position determining mechanism is provided for lifting a bearing ring 23 of the catcher bearing 21 on the housing 1 to position the housing 1 and the rotary shaft 2 in place relative to each other, whereby the superconductors 17 and the permanent magnets 14 on the shaft 2 can be positioned in place relative to each other. The superconducting bearing 4 can be operated efficiently by suitably determining the relative position.

Abstract: A superconducting bearing device includes a permanent magnet on a rotor, with a superconductor placed opposite the magnet. Flux trapped in the superconductor during cooling helps to stabilize the rotor. More specifically, the permanent magnet is mounted on the rotor so that, as the rotor rotates, its rotation does not alter the magnetic flux distribution around the axis of rotation of the rotor. The superconductor permits penetration of the magnetic flux from the magnet, being spaced from the magnet by a distance that permits a predetermined quantity of the magnetic flux to penetrate it, while not permitting rotation of the rotor to alter the distribution of the penetrating magnetic flux.

Abstract: A superconducting bearing device includes a permanent magnet on a rotor, with a superconductor placed opposite the magnet. Flux trapped in the superconductor during cooling helps to stabilize the rotor. More specifically, the permanent magnet is mounted on the rotor so that, as the rotor rotates, its rotation does not alter the magnetic flux distribution around the axis of rotation of the rotor. The superconductor permits penetration of the magnetic flux from the magnet, being space from the magnet by a distance that permits a predetermined quantity of the magnetic flux to penetrate it, while not permitting rotation of the rotor to alter the distribution of the penetrating magnetic flux.

Abstract: A bearing device for supporting a rotary body relative to a fixed portion in a noncontact state includes a superconducting bearing assembly comprising an annular permanent magnet portion fixedly mounted on the rotary body concentrically therewith and an annular superconductor portion disposed as opposed to the permanent magnet portion. A magnetic bearing assembly is disposed axially away from the superconducting bearing assembly and comprises electromagnets for controlling the position of the rotary body with respect to two radial directions orthogonal to each other.

Abstract: A brake device which performs a braking operation on a rotating body in a non-contact mode, thereby substantially eliminating the need for replacement of components. To achieve this object, the invention provides a brake device which is especially suitable for use at temperatures allowing Type II superconducting properties. A magnet and a superconductor are provided, one of which is provided on a rotating body to be braked. The quantity of magnetic flux from the magnet which permeates the superconductor is controlled so as to provide a counter-rotative force to the rotating body. According to a first aspect of the invention, a permanent magnet is provided, along with a displacing mechanism to change the distance between the permanent magnet and the superconductor. According to a second aspect of the invention, an electromagnet is provided, along with a control device for controlling the magnetic strength of the electromagnet.