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.

It is an object to provide a package for a magnetic circuit, with which a leakage magnetic field escaping from an aperture of a magnetic circuit is reduced and the magnetic attraction acting on the packaging plates is lowered, thus reducing the number of packaging work steps. There are provided a packaging plate for a permanent magnet-type magnetic circuit, the packaging plate comprising at least one non-magnetic layer and at least one magnetic layer; and a method for packaging a permanent magnet-type magnetic circuit, comprising a step of shielding at least a portion of an aperture of a permanent magnet-type magnetic circuit using at least one packaging plates.

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.

The invention relates to a coil unit (3; 6) for the inductive transfer of electrical energy, comprising a coil (9; 11; 31; 32; 33; 39) and a flux guide unit (8; 12; 34; 40) for guiding a magnetic flux generated during operation of the coil (9; 11; 31; 32; 33; 39), wherein the coil (9; 11; 31; 32; 33; 39) and / or the flux guide unit (8; 12; 34; 40) are surrounded by stray field screening (15; 16, 16'; 20; 23, 26; 26'; 27; 27'), and a device (1) for the inductive transfer of electrical energy between a fixed primary coil unit (3) and a secondary coil unit (6) mounted on a movable load. The invention solves the problem of providing a coil unit and a device for the inductive transfer of electrical energy that have a small and weak stray field, do not exceed the desired specifications for the maximum flux density outside the vehicle, and improve the efficiency of inductive energy transfer to the vehicle, comprising a coil unit in which the stray field screening (15; 16; 20; 23; 26, 27; 35; 36; 37, 38) is mounted at a lateral distance (D) from the flux guide unit (8; 12; 34; 40) and the coil (9; 11; 31; 32; 33; 39; 41).

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 power feeding coil unit includes a power feeding coil, and first and second auxiliary coils arranged so that a wire of the first auxiliary coil and a wire of the second auxiliary coil do not overlap a wire of the a power feeding coil when viewed from a direction perpendicular to an axial direction of the power feeding coil. A direction of circulation of a magnetic flux generated by the first auxiliary coil and a magnetic flux generated by the second auxiliary coil are opposite to a direction of circulation of a magnetic flux generated by the power feeding coil. An axes of the first and second auxiliary coils are substantially perpendicular to a power feeding direction of the power feeding coil, and are not aligned with the axis of the power feeding coil.

A power feeding coil unit includes a power feeding coil, and an auxiliary coil. The auxiliary coil is arranged not to interlink with a magnetic flux that interlinks with a power receiving coil that is arranged to face the power feeding coil during power feeding. An axial direction of the auxiliary coil is nonparallel to an opposing direction of the power feeding coil and the power receiving coil. A direction of circulation of a magnetic flux generated by the auxiliary coil is opposite to a direction of circulation of a magnetic flux generated by the power feeding coil.

The invention discloses a super-conduction magnetic suspension linear electromagnetic propelling system, relates to the field of a motor, and aims to solve the problems as follows: the magnetic fieldformed by a super-conduction magnet of the existing magnetic suspension propelling system is open on a vehicle, which causes severe magnetic leakage and high magnetic field shielding difficulty; the vehicle is high in weight and the conventional conduction magnetic suspension technology is relatively low in suspension height, which causes high suspension control difficulty, and relatively high requirements on circuit flatness, roadbed sinkage and turnout junction structure. The invention provides the super-conduction magnetic suspension linear electromagnetic propelling system; and by adoptionintegrated suspension, guiding winding and series magnetic path super-conductor excitation, automatic suspension and guiding of the high-speed linear propelling system mover is realized, and independent design of the propelling winding is achieved.

The invention discloses an air cooled molten aluminum permanent magnetic pump, which comprises an annular silicon carbide sealed pipeline. The annular silicon carbide sealed pipeline is arranged in a pump body and is provided with a heat insulating and isolating layer made of heat resisting materials; a main shaft is connected to a main motor and a transmission device thereof ; a permanent magnet fixed plate is connected with the main shaft; a permanent magnet is fixed on the permanent magnet fixed plate through a pure iron yoke embedded on the permanent magnet fixed plate and is arranged on upper side and the lower side of the sealed pipeline or one side or the inside thereof; an austenitic stainless steel pump body is provided with an inlet hole and an outlet hole which are used for the sealed pipeline to extend out of the pump body to be connected with the outside; a temperature sensor is arranged in the pump body; a forced cooling air system is arranged on the pump body; and a power distribution control system is connected with the main motor, the temperature sensor and the forced air cooling system. The permanent magnetic pump has the obvious advantages of high energy conservation, high efficiency, low cost, no pollution, low maintenance cost, long service life and reliable work.

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 current sensor includes a magnetic detection element that senses a magnetic flux generated from a current path to perform electromagnetic conversion, and at least two magnetic shields that are arranged around the magnetic detection element and shield an external magnetic flux affecting the magnetic detection element. The at least two magnetic shields include a first magnetic shield and a second magnetic shield facing each other across the magnetic detection element and the current path. At least one of the first magnetic shield and the second magnetic shield includes at least two base portions and a coupling portion coupling the at least two base portions. The at least one of the first magnetic shield and the second magnetic field has a recess recessed from a periphery in a surface facing the other of the first magnetic shield and the second magnetic shield.

The invention provides a three-pole type magnetic coupling mechanism transmitting terminal and magnetic coupling mechanism applied to a wireless power supply system of an electric automobile. The three-pole type magnetic coupling mechanism transmitting terminal consists of two parts, one part is a transmitting coil and the other part is a transmitting terminal magnetic core; the transmitting terminal magnetic core is laid below the transmitting coil; and the transmitting coil consists of three rectangular coils connected in series, the width of the left-side rectangular coil is w1, the width of the middle rectangular coil is w2, the width of the right-side rectangular coil is w1, the lengths of the three rectangular coils are the same, and the three rectangular coils are parallelly placedon the same horizontal plane. According to the structures of the three-pole type magnetic coupling mechanism transmitting terminal and magnetic coupling mechanism applied to the wireless power supplysystem of the electric automobile, the directions of magnetic fields generated by the transmitting coil in a receiving coil are the same and the magnetic fields are overlapped mutually, and the transmission power of the system is increased; while the directions of magnetic fields generated outside the transmitting coil by the transmitting coil are in the opposite directions, and a leakage magneticfield is weakened; and the electromagnetic radiation generated by the magnetic coupling mechanism is reduced, so that the wireless power supply system cannot cause radiation hazards to electronic equipment and pedestrians around automobiles, and the problem of poor electromagnetic compatibility of an existing magnetic coupling mechanism is solved.

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.

The invention relates to a cylinder having a piston (14) moving in a cylinder housing (12), said piston being fastened to a cylinder rod (16) and rotatable about a cylinder longitudinal axis (L), and further having a position sensor (18), comprising a sensor magnet (20) and a sensor element (22), which interacts with the sensor magnet (20), and which is configured for detecting a cylinder rod position relative to the cylinder housing (12). The invention provides that the sensor magnet (20) is fastened on the cylinder rod rotatably with respect to the cylinder rod (16) and is guided non-rotatably with respect to the cylinder housing (12).

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.

It is an object to provide a package for a magnetic circuit, with which a leakage magnetic field escaping from an aperture of a magnetic circuit is reduced and the magnetic attraction acting on the packaging plates is lowered, thus reducing the number of packaging work steps. There are provided a packaging plate for a permanent magnet-type magnetic circuit, the packaging plate comprising at least one non-magnetic layer and at least one magnetic layer; and a method for packaging a permanent magnet-type magnetic circuit, comprising a step of shielding at least a portion of an aperture of a permanent magnet-type magnetic circuit using at least one packaging plates.

Embodiments of the invention provide a magnetic head (magnetic disk storage) which does not erase data on a recording medium even when a stray field is applied. In one embodiment, the head has a structure that d1=<t1 and d2=<t2 are satisfied where d1 denotes the positional difference between edges of an auxiliary pole and an upper shield in the cross-track direction, d2 denotes the positional difference between edges of the upper shield and a lower shield in the cross-track direction, t1 the film thickness of the auxiliary pole or upper shield, whichever magnetic layer is larger in cross-track width, and t2 the film thickness of the upper shield or lower shield, whichever magnetic layer is larger in cross-track width.

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.

The invention relates to a high-speed magnetic levitation linear eddy current brake system and belongs to the motor field. The invention aims to solve the problem that an existing magnetic levitationlinear eddy current brake system requires a special levitation and guide control device. The high-speed magnetic levitation linear eddy current brake system of the invention comprises a stator and a mover; the stator comprises levitation guide primary windings and stator conductor plates; the mover comprises mover magnetic poles; a plurality of coil sets are sequentially arranged along the movingdirection of the mover and fixed on a coil substrate; each coil set is composed of two rectangular coils of which the winding directions are opposite to each other; the two rectangular coils are arranged along a horizontal direction and are perpendicular to the moving direction of the mover; the rectangular coils are connected with one another end to end; the stator conductor plates are located between the two rectangular coils; and the stator conductor plates are vertical to the ground; the mover magnetic poles are located above the levitation guide primary windings and are aligned with the levitation guide primary windings; and air gaps are left between the mover magnetic poles and the levitation guide primary windings.

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.

An R-ALIP type electromagnetic pump having an inner core, a linear pipe, and a combination of an outer core and coils provided around the linear pipe is disposed outside a solder vessel containing a molten solder. The solder vessel has a bottom wall made of an iron having at least 100 times as high a magnetic permeability as that of the molten solder and having a magnetic permeability not less than that of the inner core and a wall thickness not less than that of the inner core so that a magnetic field from the R-ALIP type electromagnetic pump cannot leak into the solder. Therefore, a stray current derived from an alternating magnetic field can be prevented from spreading in the molten solder.

A superconducting electromagnet is provided with a magnetic shield for protecting, from a leakage magnetic flux of the superconducting electromagnet, a motor for driving a cryocooler for cooling a cooling medium in a coil vessel, in which the superconducting coil is housed with the cooling medium. The magnetic shield includes a pair of ferromagnetic material plates placed opposite each other across the motor. Leakage magnetic fluxes in an opening space formed between a pair of the ferromagnetic material plates are attracted thereto to drastically reduce a density of the leakage magnetic fluxes around the motor. The opening space formed between the ferromagnetic material plates also facilitates maintenance of the cryocooler and the motor.

The invention discloses an air cooled molten aluminum permanent magnetic pump, which comprises an annular silicon carbide sealed pipeline. The annular silicon carbide sealed pipeline is arranged in a pump body and is provided with a heat insulating and isolating layer made of heat resisting materials; a main shaft is connected to a main motor and a transmission device thereof ; a permanent magnetfixed plate is connected with the main shaft; a permanent magnet is fixed on the permanent magnet fixed plate through a pure iron yoke embedded on the permanent magnet fixed plate and is arranged on upper side and the lower side of the sealed pipeline or one side or the inside thereof; an austenitic stainless steel pump body is provided with an inlet hole and an outlet hole which are used for thesealed pipeline to extend out of the pump body to be connected with the outside; a temperature sensor is arranged in the pump body; a forced cooling air system is arranged on the pump body; and a power distribution control system is connected with the main motor, the temperature sensor and the forced air cooling system. The permanent magnetic pump has the obvious advantages of high energy conservation, high efficiency, low cost, no pollution, low maintenance cost, long service life and reliable work.