70results about How to "Reduce leakage field" patented technology

Embodiments of the invention provide a perpendicular recording magnetic head capable of reducing leakage magnetic fields from the soft magnetic films on the air bearing surface side and reducing the protrusion of the soft magnetic films in the direction of the air bearing surface side due to thermal deformation of the soft magnetic films. In one embodiment, the write functional section includes a coil conductor, second soft magnetic film pattern and first soft magnetic film pattern that cover the coil conductor from top and bottom and are magnetically coupled to each other, and a main magnetic pole piece determining a track width. The read functional section includes a reading element sandwiched between two magnetic shield films. A pedestal magnetic pole pattern is formed at the frontal end position of the first soft magnetic film pattern.

The invention discloses a permanent magnet motor which comprises a stator with a central hole and a rotor located in the central hole. A stator core is provided with a plurality line grooves for containing stator windings and coiling teeth located between adjacent line grooves, the tail end of each coiling tooth is further provided with a pair of wedge-shaped portions respectively extending to directions of the line grooves, each wedge-shaped portion is provided with an inner end face facing the rotor, each inner end face comprises an arc section located in the middle of the inner end face, the central hole is provided with a circle center, the radian of an arc face is larger than the radian of the central hole, and the circle center of the arc face does not coincide with that of the central hole. Compared with the prior art, the permanent magnet motor has the advantages of effectively improving performance of the permanent magnet motor through the characteristic that the radian of the arc section does not coincide with that of the central hole of the stator, and reducing machining requirements for the rotor due to the fact that only the stator is machined.

A perpendicular magnetic recording head includes a nonmagnetic insulating layer and a main magnetic pole layer disposed on the nonmagnetic insulating layer. The main magnetic pole layer includes a pole straight part exposed in an opposing surface opposite a recording medium and a flared part that extends from the pole straight part in a height direction. The flared part broadens in a track width direction as the flared part extends in the height direction. The pole straight part of the main magnetic pole layer as viewed from the opposing surface has a trapezoidal shape over its entire length, the trapezoidal shape being narrowed at the nonmagnetic insulating layer-side. The flared part as viewed from the opposing surface has a trapezoidal shape at least at a junction with the pole straight part, the trapezoidal shape being narrowed at the nonmagnetic insulating layer-side.

A coil unit includes first and second coils that are apposed, and third and fourth coils located on the rear side of the first and second coils so as to interpose the center of the first coil and the center of the second coil between the third and fourth coils, in the direction of alignment of the first and second coils. The axial direction of the third and fourth coils is substantially perpendicular to the axial direction of the first and second coils. First to fourth drive control units control the directions or phases of the currents to be supplied to the first to fourth coils, respectively.

A coil unit includes a non-magnetic conductive plate which is disposed in an arrangement direction of first and second coils have reverse winding direction to each other, and a magnetic body. The magnetic body includes a first portion which is positioned in an outer side than an outline of one side of the conductive plate in the arrangement direction of the first and second coils, and a second portion which is positioned in an outer side than an outline of the other side of the conductive plate in the arrangement direction of the first and second coils. When viewing from the arrangement direction of the first and second coils, the first and second portions are positioned on a side of the conductive plate where is opposite to a side which faces the first and second coils.

A section perpendicular to a tube axis, of a yoke portion having a deflection yoke mounted thereon is in the shape of a non-circle based on a rectangle. A section perpendicular to the tube axis, of a core portion of the deflection yoke has a shape holding the relationwhere M:N is an aspect ratio, SB is the inner diameter along the vertical axis, LB the inner diameter along the horizontal axis, and DB a maximum inner diameter.

The invention discloses a single-phase permanent magnet brushless direct-current motor with auxiliary teeth and auxiliary windings. The single-phase permanent magnet brushless direct-current motor includes a stator and a permanent magnet rotor; the stator is provided with a plurality of stator main pole teeth and stator auxiliary pole teeth which are uniformly distributed along the circumference of the stator, wherein the stator main pole teeth and the stator auxiliary pole teeth are arranged at intervals; the total number of the tooth slots of the stator main pole teeth and stator auxiliary pole teeth is twice of the number of the poles of the permanent magnet rotor of the motor; the width of the stator main pole teeth is 1.55 to 2 times of the width of the stator auxiliary pole teeth; main tooth arc surfaces are formed at the roots of the stator main pole teeth; auxiliary tooth arc surfaces are formed at the roots of the stator auxiliary pole teeth; slot openings are formed between the main tooth arc surfaces of the stator main pole teeth and the auxiliary tooth arc surfaces of the stator auxiliary pole teeth; and the central line of each slot opening deviates from the central line of a corresponding stator auxiliary pole tooth by a certain angle. After the single-phase permanent magnet brushless direct-current motor of the invention is energized, a magnetomotive force F generated by stator current has voltage difference, and therefore, a dead point can be eliminated; and the starting instant magnetomotive force voltage difference can change with the magnitude of the controllable stator current, and therefore, the starting instant magnetomotive force voltage difference can be controlled, and the motor can be started smoothly without vibration.

A non-contact power transmission system according to the present disclosure includes a power transmitting coil and a power receiving coil facing the power transmitting coil. At least one of the power transmitting coil and the power receiving coil includes a first coil in which a wire is wound around a first core, and a second coil in which a wire is wound around a second core. The second coil is placed at at least one end of a winding axis of the first coil. A winding axis of the second coil is inclined with respect to the winding axis of the first coil toward the power transmitting or receiving coil that faces the second coil.

A wireless power supply system is a wireless power supply system provided with a travel lane for wirelessly transmitting power to a moving body and includes a power transmitting coil that is disposed such that the axial direction of the coil is substantially parallel to the width direction of the travel lane, and electromagnetic shielding walls that are disposed on the respective sides of the travel lane in the extension direction of the travel lane.

A coil unit includes a non-magnetic conductive plate which is disposed along an axis of a coil, and a magnetic body. The magnetic body includes a first portion which is positioned in an outer side than an outline of one side of the conductive plate in the axis direction of the coil, and a second portion which is positioned in an outer side than an outline of the other side of the conductive plate in the axis direction of the coil. When viewing from the axis direction of the coil, the first and second portions are positioned on a side of the conductive plate where is opposite to a side which faces the coil.

The invention relates to a resonant reactive shielding method and system of a plane wireless power transmission system. The method comprises the following steps: arranging a shielding coil at a coil periphery of a wireless power transmission system, wherein a matching capacitor for adjusting a capacitance of the shielding coil is arranged in the shielding coil; producing induced voltage in the shielding coil by utilizing a drain magnetic field produced by the coil of the wireless power transmission system, thereby producing current in the shielding coil; adjusting the size of the shielding coil and the capacitance of the matching capacitor, enabling the current flowing in the shielding coil to produce a cancelling magnetic field opposite to the drain magnetic field, wherein the canceling magnetic field and the drain magnetic field are mutually counteracted, thereby reducing the drain magnetic field. The resonant reactive shielding system of the plane wireless power transmission provided by the invention is simple in structure, the added source shielding coil and load shielding coil are small in size and are reactive elements, the reduction of the power transmission efficiency can be ignored, and the resonant reactive shielding system can be applied to other mobile applications.

A lamp base (2) for a high-pressure discharge lamp comprises an ignition transformer (1000), which is placed in the interior (214) of the lamp base (2) and which serves to ignite the gas discharge inside the high-pressure discharge lamp. To this end, the ignition transformer (1000) comprises a core on which its windings (1001, 1002) are placed. The core is formed by a first core part (1004) and by at least one second core part (1005, 1006, 1007), which are each made of a ferromagnetic or ferrimagnetic material and are separated by at least one gap (10078). The first core part (1004) has a cylindrical section on which the windings (1001, 1002) of the ignition transformer (1000) are placed, and core parts (1004, 1005, 1006, 1007) are formed in such a manner that the core, apart from the at least one gap (1008), has a closed shape.