37results about How to "Suppression of Leakage Flux" patented technology

Provided is an antenna coil capable of forming a magnetic field in a desired direction in an efficient manner, while suppressing leakage of magnetic flux into a space other than the space in which the magnetic field is formed. The antenna coil includes a main coil portion formed by winding a length of conductor wire around a first reference axis and an auxiliary coil portion formed by winding the conductor wire around a second reference axis. The second reference axis is set to intersect the magnetic flux of the main coil portion at an axial end of the auxiliary coil portion. The main coil portion and the auxiliary coil portion are connected to together form a closed circuit.

A reactor that can be disposed between stacked coolers, the reactor includes a flat case, a pair of coils, and core material. The pair of coils is (i) located in the flat case, (ii) wound in opposite directions from each other, and (iii) disposed adjacent to each other in a radial direction of the coils. The core material is covering the coils in the flat case.

A coil component includes a magnetic body part and a coil part. The magnetic body part has first and second magnetic layers stacked together alternately in one axis direction, and cover parts covering the first and second magnetic layers from the one axis direction. The coil part has conductor patterns provided on the second magnetic layers. The magnetic body part includes: oblate soft magnetic grain-containing layers extending over the entire range of the magnetic body part in the direction perpendicular to the one axis direction, exposed in the direction perpendicular to the one axis direction, and formed by oblate soft magnetic grains whose thickness direction is oriented in the one axis direction; and spherical grain-containing layers adjoining the oblate soft magnetic grain-containing layers in the one axis direction, and formed by insulative spherical grains.

A motor includes a stator, a rotor, and a case. The stator includes a stator core and windings. The rotor is provided inside the stator. The rotor includes first and second rotor cores and a field magnet. The first and second rotor cores each includes a core base and claw-shaped magnetic poles. The core bases are opposed to each other and the claw-shaped magnetic poles of the first and second rotor cores are alternately disposed in a circumferential direction. The field magnet is disposed between the core bases in the axial direction. The field magnet is magnetized in the axial direction so as to cause the claw-shaped magnetic poles of the first rotor core and the second rotor core to function respectively as first magnetic poles and second magnetic poles. At least part of an end part of the case in the axial direction is made of a non-magnetic body.

A rotor (10) of a buried magnet-type electric motor, wherein the magnetic poles thereof are each constituted by two rows of magnets (M1, M2) of the same pole, wherein a core portion (12) between magnet slots of the same pole is arranged between the magnet slots (31, 32) in which the two rows of magnets are arranged, and wherein, of the edges constituting said magnet slots, the portions connecting the edges (31a, 32a) on the inner side in the radial direction to the outer edges of the core portion between the magnet slots of the same pole, have curved portions (41, 42) that connect a curve of a small curvature to a curve of a large curvature starting from the edges on the inner side in the radial direction and heading toward the outer edges of the core portion between the magnet slots of the same pole.

First side surfaces 22bb of first magnetic pole portions 22b and second side surfaces 23bb of second magnetic pole portions 23b that face each other in a circumferential direction are configured into parallel flat surfaces, first circumferentially tapered portions 25b are formed on circumferential shoulder portions of the first magnetic pole portions 22b, second circumferentially tapered portions 26b are formed on circumferential shoulder portions of the second magnetic pole portions 23b, and portions of the first and second circumferentially tapered portions 25b and 26b enter a region 24 in which the first side surfaces 22bb and the second side surfaces 23bb that face each other in the circumferential direction overlap when viewed from a direction that is perpendicular to the first side surfaces 22bb and the second side surfaces 23bb.

A permeability measurement apparatus includes a magnetic field generation means applying an alternating magnetic field having a predetermined frequency to a magnetic substance to be measured; a probe needle placed in proximity or in contact to a microscopic area of the magnetic substance to be measured to which the alternating magnetic field is applied; a resonator including a coil wound on the probe needle, and generating a magnetic field having a resonant frequency higher than the frequency of the alternating magnetic field applied on the microscopic area having the probe needle in proximity or in contact thereto, and having an inductance of the coil varied as permeability in the microscopic area varies; and a measurement means measuring the permeability of the microscopic area of the magnetic substance to be measured based on the variation of the resonant frequency of the resonator according to the variation of the coil inductance.

First side surfaces 22bb of first magnetic pole portions 22b and second side surfaces 23bb of second magnetic pole portions 23b that face each other in a circumferential direction are configured into parallel flat surfaces, first circumferentially tapered portions 25b are formed on circumferential shoulder portions of the first magnetic pole portions 22b, second circumferentially tapered portions 26b are formed on circumferential shoulder portions of the second magnetic pole portions 23b, and portions of the first and second circumferentially tapered portions 25b and 26b enter a region 24 in which the first side surfaces 22bb and the second side surfaces 23bb that face each other in the circumferential direction overlap when viewed from a direction that is perpendicular to the first side surfaces 22bb and the second side surfaces 23bb.

A transformer is provided having good workability during production and good connection of the secondary main coil and the primary supportive coil. The transformer has a bobbin with a base part and first hollow cylinder part with a first through hole and a core projecting in a first positive direction from said base part, and a case having an upper collar part formed with a primary main coil wound around said first hollow cylinder part, a second through hole leading to said first through hole, and a second hollow cylinder part formed at the outer peripheral face. Said primary main coil is housed and projects in a first negative direction from said upper collar part. A lower collar part opposes said base part by extending approximately parallel to said mounting face. The primary supportive coil and secondary main coil are wound around said first and second sections, respectively.

A motor is provided in a shell. The motor includes a stator having an outer peripheral surface facing an inner peripheral surface of the shell, a rotor rotatably disposed inside the stator, and a nonmagnetic film disposed between the outer peripheral surface of the stator and the inner peripheral surface of the shell.

A magnetization direction in a magnetosensing layer (5b) is perturbed near the magnetic connection between a magnetic yoke (5) and the magnetosensing layer (5b). If the magnetization direction of a region in the magnetosensing layer (5b) facing a fixed layer which functions during read is not perturbed, reliability is improved. In this magnetometric sensor, a surface area S1 of fixed layers (43, 44) is made smaller than a surface area S2 of the magnetosensing layer (5b) so that, in the region of the magnetosensing layer (5b) facing the fixed layer, the magnetization direction is perturbed less than in the surrounding region and reliability during data read is improved.

A magnetic component is provided which has excellent DC overlay properties and is capable of suppressing leakage flux. The magnetic component includes: ferrite cores 100U, 100D each having two protruding components 104L, 104R; a ferrite core 110L disposed between one of the projecting members 104L of the ferrite cores 100U, 100D via the spacer 200L; a ferrite core 110R disposed via another spacer 200R between another of the protruding members 104R of the ferrite cores 100U, 100D; a coil 300L arranged so that the ferrite core 110L is located on an inner peripheral side thereof; and a coil 300R arranged so that the ferrite core 110R is located on an inner peripheral side thereof, the spacers 200L being located on the inner peripheral side of the coil 300L and the spacers 200R being located on the inner peripheral side of the coil 300R.

PROBLEM TO BE SOLVED: To improve torque and efficiency by reducing a leakage magnetic flux of a permanent magnet in a permanent magnet type motor employing a spoke-type magnet.SOLUTION: The permanent magnet type motor comprises a stator including a plurality of teeth and a rotor which is disposed via a gap in a radial direction relative to the stator. The rotor is configured by axially combining an S-pole core that is magnetized closer to an S pole, and an N-pole core that is magnetized closer to an N pole. In the S-pole core, a plurality of S-side protrusions are formed which protrude outside in a circumferential direction and in the N-pole core, a plurality of N-side protrusions are formed which protrude outside in a circumferential direction. By combining the S-pole core and the N-pole core, the S-side protrusions and the N-side protrusions are disposed alternately and between the alternately disposed S-side protrusion and the N-side protrusion, a protrusion permanent magnet is disposed in such a manner that a side of the S-side protrusion becomes the S pole and a side of the N-side protrusion becomes the N pole.