32results about How to "Improve magnetic circuit efficiency" patented technology

A solenoid for a direct acting solenoid valve having reduced copper in a coil thereof is provided. The solenoid utilizes a stepped profile for a guide tube thereof, which reduces reluctance in the magnetic circuit such that a coil with less copper windings can be used. A direct acting solenoid valve utilizing such a reduced copper solenoid is also provided.

A magnetic sector for charged particle beam transport that includes a magnetic field profile that achieves a linear dispersion from a collimated beam of charged particles proportional to their mass-energy-to-charge ratio. In one embodiment, the field profile necessary for the linear dispersion is obtained by the use of shaped, highly permeable poles powered by permanent magnets or electromagnetic coils.

The invention provides a linear vibration motor, which comprises a magnetic circuit system and an oscillator system, wherein the magnetic circuit system comprises a main magnetic circuit system and two secondary magnetic circuit systems; the main magnetic circuit system comprises first magnetic steel, a pole shank and second magnetic steel which are sequentially stacked along the vibration direction of the oscillator system; the first magnetic steel and the second magnetic steel are arranged in a homopolar opposite manner; each secondary magnetic circuit system comprises third magnetic steel; two opposite sides of the pole shank are homopolar opposite; and the polarities of homopolar opposite magnetic poles of the third magnetic steel are opposite to that of the homopolar opposite magnetic pole of the main magnetic circuit system. Compared with a related technology, the linear vibration motor provided by the invention has the advantages that the first magnetic steel and the second magnetic steel are arranged in a homopolar opposite manner and the secondary magnetic circuit systems are arranged at two opposite sides of the main magnetic circuit system, so that the magnetic field intensity of the magnetic circuit system is increased.

A speaker apparatus comprises an inner magnet type magnetic circuit for driving a voice coil connected to a vibrating plate. The magnetic circuit comprises; a yoke; a magnet at least partly mounted at an inside of the yoke; a pole piece being attached to the other magnetized face of the magnet at the inside of the yoke; a repulsive magnet both faces being magnetized to polarities reverse to a polarity of the magnet and attached on a surface thereof of a vibrating plate side of the pole piece; and a short-circuit ring mounted and fitted to an inner peripheral portion of a front end of the cylinder portion of the yoke.

A magnetic field generator (10) capable of generating a more intense magnetic field, and an MRI apparatus (200) using it are provided. Permanent magnets (12a), (12b), (14a), (14b), (16a), (16b), (18a), (18b), (20a), (20b), (22) and (24) are disposed annularly for formation of a magnetic field generation space (30). Ferromagnetic materials (26a) and (26b) are provided near the magnetic field generation space (30), at places passed by a magnetic flux. Each of the permanent magnets (12a), (14a), (16a), (18a) and (20a) surrounding the ferromagnetic material (26a) is magnetized so as to make an S pole on the side of the ferromagnetic material (26a). Each of the permanent magnets (12b), (14b), (16b), (18b) and (20b) surrounding the ferromagnetic material (26b) is magnetized so as to make an N pole on the side of the ferromagnetic material (26b). An MRI apparatus (200) is obtained by using the magnetic field generator (10).

The invention discloses a magnetic shield assembly of a circulator. The magnetic shield assembly comprises a cavity (1) and one or more shield plates (2), wherein the upper part, the lower part and the periphery of the cavity (1) are respectively provided with at least one shield plate (2) to form a closed magnetic circuit. According to the magnetic shield assembly of the circulator provided by the invention, a low-magnetic-resistance channel is provided, the advantages of increasing the magnetic circuit efficiency of the circulator, reducing magnetic leakage and reducing the influence of an external magnetic field to the electric performance of the circulator are achieved, magnetic-sensitive components around the circulator are protected from the influence of the magnetic field of the circulator, the energy of a permanent magnet is concentrated inside the circulator as much as possible, and thus, the maximal energy utilization rate is achieved.

The invention discloses a sound production device and an earphone, and the sound production device comprises a shell, a high-pitch unit and a low-pitch unit; the high-pitch unit is fixed to the shell and located in the shell, the high-pitch unit comprises a magnetic conduction shell, a magnetic conduction vibrating diaphragm and a high-pitch magnetic circuit system, the magnetic conduction vibrating diaphragm and the high-pitch magnetic circuit system are arranged in the magnetic conduction shell, and the magnetic conduction vibrating diaphragm is suspended in the high-pitch magnetic circuit system. The high pitch magnetic circuit system is used for generating an alternating electromagnetic field to drive the magnetic conductive diaphragm to vibrate. The bass unit is fixed with the shell and located in the shell, the bass unit comprises a bass magnetic circuit assembly, a bass vibrating diaphragm and a bass voice coil connected with the bass vibrating diaphragm, a bass magnetic gap for the insertion of the bass voice coil is formed between the bass magnetic circuit assembly and the magnetic conductive shell, and the bass unit and the treble unit are coaxially arranged. According to the sound production device, the high-frequency performance and the low-frequency performance are both considered, the sound-electricity conversion efficiency of the high-pitch unit is high, the occupied space of the sound production device in the earphone is reduced, and the magnetic circuit efficiency is improved.

The invention discloses a sound production device and an earphone, the sound production device comprises a magnet yoke, a high pitch unit and a low pitch unit, the magnet yoke comprises an accommodating part, and the accommodating part comprises a side wall and a bottom wall which are connected with each other to form an accommodating space; the high pitch unit comprises a first magnetic part, a high-pitch vibrating diaphragm and a high-pitch voice coil connected with the high-pitch vibrating diaphragm, the first magnetic part is placed in the accommodating space, a high-pitch magnetic gap for inserting the high-pitch voice coil is formed between the first magnetic part and the side wall, and the high-pitch vibrating diaphragm is a planar metal vibrating diaphragm; the low pitch unit comprises a second magnetic part, a low pitch vibrating diaphragm and a low pitch voice coil connected with the low pitch vibrating diaphragm, a low pitch magnetic gap allowing the low pitch voice coil to be inserted is formed between the second magnetic part and the side wall, and the low pitch unit and the high pitch unit are coaxially arranged. According to the invention, both the high-frequency performance and the low-frequency performance are considered, and the high-pitch unit is embedded into the low-pitch unit. The central magnetic circuit part of the bass unit is directly replaced, and the occupied space of the sound production device in the earphone is reduced while the magnetic flux is provided.

According to a solenoid air valve, a flange portion of a moving core and a flange portion area of a bobbin implement a stop area defining a distance of travel of the moving core in a direction away from a fixed core. An end portion of a shaft portion of the moving core can project outward through an opening of a frame cover, so that a gap between a surface of the frame cover facing the shaft portion and a side surface of the shaft portion (distance: L2) can be minimized. Consequently, a solenoid air valve having a structure allowing improvement in magnetic efficiency by making smaller the gap between the frame and the moving core is provided.

The invention discloses an ultra-thin loudspeaker which comprises a magnetic circuit device and a vibration device fitted with the magnetic circuit device, wherein the magnetic circuit device comprises T iron, an outer magnetic ring fitted with a groove formed in the outer circumferential surface of the T iron, an inner magnetic ring fitted with a pit formed in the middle of the T iron, and a washer fitted with the inner magnetic ring; a clearance is reserved between the washer and the inner side wall of the pit; and a voice coil of the vibration device is inserted in the clearance. Compared with the conventional loudspeaker, the ultra-thin loudspeaker adopting the structural design has the advantages that the thickness can be reduced effectively, the magnetic circuit efficiency is improved, and then the sound quality of the loudspeaker is improved.

The invention belongs to the technical field of reed switches and vacuum switches, and particularly relates to a reed switch tube structure which comprises a metalized ceramic tube, a moving electrode and a static electrode, wherein the moving electrode and the static electrode are packaged at two ends of the metalized ceramic tube and are made of a soft magnetic metal material; the moving electrode and the static electrode are both in brazed sealing connection with the metallized ceramic tube, and the interior of the ceramic tube is vacuumized or filled with inert gas; a magnetic circuit pole shoe is arranged at the end, which extends into the ceramic tube, of the static electrode, the pole shoe and the static electrode are integrally formed, a static reed is mounted on the pole shoe, one end of the static reed is fixed with the pole shoe in a welding or riveting manner, and a static contact is fixedly mounted at the other end of the static reed; the end, which extends into the ceramic tube,of the moving electrode is provided with a magnetic circuit magnetic pole, the magnetic pole and the moving electrode are integrally formed, the magnetic pole is provided with a moving reed, one end of the moving reed is fixedly welded or riveted with the magnetic pole, the other end of the moving reed is fixedly provided with a moving contact, the middle part of the moving reed is provided with an armature, and the end, which is close to the magnetic pole,of the armature is lapped with the magnetic pole. According to the invention, the switch tube has extremely long mechanical life.

The invention belongs to the technical field of reed switches, and particularly relates to a large-load reed switch structure which comprises a glass tube, a short pin and a long pin, the short pin and the long pin are packaged at two ends of the glass tube and hermetically connected with the glass tube, and a pole shoe is arranged at one end, extending into the glass tube, of the short pin. The pole shoes and the short pins are integrally formed; according to the design, a design structure of magnetic circuit and circuit separation is adopted, the high-conductivity reed is adopted to reduce the on resistance of the circuit, and unreliable switching action caused by demagnetization of a magnetic circuit due to resistance heating of large-load current is reduced; a clapper-type armature magnetic circuit structure is adopted, the inherent elastic recovery counterforce of a traditional reed switch magnetic reed is eliminated while the armature can generate attraction action under the action of a magnetic field, and the recovery counterforce required for breaking a contact is independently provided by a copper alloy elastic conductive reed, so that the contact area of the contact is increased for increasing the sectional area of the copper alloy elastic reed of the circuit. And conditions are created for reducing the circuit resistance.

The invention discloses a small-sized electromagnetic relay applicable to an intelligent socket. The small-sized electromagnetic relay comprises a body, and a magnetic circuit part and at least two groups of contact parts which are arranged on the body, wherein the magnetic circuit part comprises a coil, a yoke and an armature; all the groups of contact parts comprise dynamic springs and static springs; the dynamic springs and the static springs are matched; first bent parts are respectively arranged on the dynamic springs and the static springs. By arrangement of the first bent parts, the flat plate design of the conventional static springs and dynamic springs is changed, so that on the basis of not increasing the manufacturing cost and the assembling difficulty, aims that the relay enlarges a current carrying area of a reed under a finite volume and improves the current carrying capacity of the reed are fulfilled; according to the quantity of the contact parts, at least two groups offirst bent parts are designed, so that the relay disclosed by the invention can switch on and switch off a zero line and a live wire; the safety of the intelligent socket is improved; mounting requirements of the socket for a high load and a small size are met.

The present invention provides a magnetron which can conduct more magnetic flux in the active space at the periphery of a cathode structure to thereby further improve the efficiency of a magnetic circuit. The magnetron of the present invention includes an anode cylinder on which inner wall a plurality of anode vanes are provided, a pole piece provided on an end side of the anode cylinder, a circular magnet provided on the vicinity of the pole piece, and a magnet ring provided between the anode cylinder and the circular magnet. An outer diameter of the magnet ring is smaller than or equal to the outer diameter of the circular magnet and larger than or equal to the outer diameter of the anode cylinder. The magnet ring has a portion on a surface of the pole piece side whose normal line is non-parallel to the central axis of the anode cylinder.

A drive apparatus comprising a stationary frame with a coil, a movable frame with a magnetic circuit held movably in a direction orthogonal to a first direction, and a drive unit that moves the movable frame by applying electric current to the coil. The magnetic circuit is constituted by aligning a first magnet having a magnetization direction parallel to the first direction, a second magnet having a magnetization direction opposite to the first magnet, and a third magnet between the first and second magnets in a direction orthogonal to the first direction. The third magnet has a magnetization direction that has a pole in the same direction of the poles of the first and second magnets when viewed from the coil side. The side spaces of the first and second magnets opposite to the third magnet are occupied by material whose magnetic permeability is lower than the magnets.

The invention provides a bistable locomotive vehicle-mounted electromagnetic relay and belongs to the technical field of relays. A magnetism isolating gasket is fixedly arranged at the bottom of an armature, the lower portion of the middle of the assembled armature and magnetism isolating gasket is connected with a permanent magnet, the lower portion of the permanent magnet of a permanent magnet frame is connected with a magnetic conductive block, and the bottom of the magnetic conductive block is connected with a yoke; and an iron core, a coil rack and a coil assembly are respectively arranged between the left side and the right side of the armature and the magnetism isolating gasket after the armature and the magnetism isolating gasket are assembled and the yoke below the armature and the magnetism isolating gasket. The permanent magnet structure is added in the magnetic circuit, the permanent magnet magnetic circuit provides retention force when the relay is not powered on, after the armature starts to rotate, due to the change of an air gap, the permanent magnet attraction force on one side can be rapidly reduced, the permanent magnet attraction force on the other side can be increased, the coil power can be reduced, and the attraction speed can be increased.

The invention discloses a permanent-magnet-containing balance armature relay electromagnetic structure and belongs to the technical field of relays. An armature is arranged at one side of an upper yoke and a lower yoke, the middle part of the armature is rotatably supported on an outer frame through a rotating shaft, the two ends of the armature are arranged with the upper yoke and the lower yoke in an opening and closing manner respectively, the magnetic steel is arranged on the lower yoke and is connected with the middle part of the armature through a magnetic conductive piece, and the magnetic steel is close to the armature close to one end of the lower yoke. The magnetic flux generated by the magnetic steel can be effectively utilized, so that magnetic leakage waste is avoided, the magnetic circuit efficiency is improved, the relay power is reduced, the environment resistance of the relay is improved, and the problems that an existing relay is low in release retention, poor in vibration and impact resistance, high in power consumption and the like are solved.

The invention discloses a novel ultra-thin electromagnetic relay which comprises a contact component, a magnetic circuit component and a base, wherein the contact component and the magnetic circuit component are correspondingly matched and arranged on the base; a yokeiron / an iron core of the magnetic circuit component is an integral type structure which takes the shape of a reversed U; a strip-shaped opening is arranged at the bottom end of a coil rack of the magnetic circuit component along an axial line of a winding tube of the magnetic circuit component, the strip-shaped opening of the winding tube extends towards two sides to cause the bottom end of the coil rack to form a through groove which is provided with a downward opening and used for embedding the yokeiron / the iron core, and the through groove is provided with a convex structure used for preventing the embedded yokeiron / the iron core from dropping out corresponding to the inner side of the groove edge of the winding tube section. The electromagnetic relay with the structures can ensure that the magnetic circuit efficiency is promoted, and the aims of appropriately reducing the number of turns of the windings, the using amount of lacquered wires and the cost and promoting the medium voltage resistance between the output terminal and the input terminal can be achieved.

The present invention provides a magnetron which can conduct more magnetic flux in the active space at the periphery of a cathode structure to thereby further improve the efficiency of a magnetic circuit. The magnetron of the present invention includes an anode cylinder on which inner wall a plurality of anode vanes are provided, a pole piece provided on an end side of the anode cylinder, a circular magnet provided on the vicinity of the pole piece, and a magnet ring provided between the anode cylinder and the circular magnet. An outer diameter of the magnet ring is smaller than or equal to the outer diameter of the circular magnet and larger than or equal to the outer diameter of the anode cylinder. The magnet ring has a portion on a surface of the pole piece side whose normal line is non-parallel to the central axis of the anode cylinder.

The present invention provides a magnetron which can conduct more magnetic flux in the active space at the periphery of a cathode structure to thereby further improve the efficiency of a magnetic circuit. The magnetron of the present invention includes an anode cylinder on which inner wall a plurality of anode vanes are provided, a pole piece provided on an end side of the anode cylinder, a circular magnet provided on the vicinity of the pole piece, and a magnet ring provided between the anode cylinder and the circular magnet. An outer diameter of the magnet ring is smaller than or equal to the outer diameter of the circular magnet and larger than or equal to the outer diameter of the anode cylinder. The magnet ring has a portion on a surface of the pole piece side whose normal line is non-parallel to the central axis of the anode cylinder.

The invention discloses a shearing type double-cylinder magneto-rheological damper. The shearing type double-cylinder magneto-rheological damper comprises an upper shearing plate and a lower shearing plate. The upper shearing plate is connected with a vehicle frame. The lower shearing plate is connected with a vibrating wheel. A containing cavity defined by four face plates is arranged on the lower shearing plate. A top plate is arranged on the top of the containing cavity. An open groove is formed in the top of the top plate. The containing cavity is divided by the open groove into a left containing cavity body and a right containing cavity body. Two piston cylinders are arranged in the left containing cavity body and the right containing cavity body respectively. Each piston cylinder is filled with magneto-rheological fluid. An opening of each piston cylinder is sealed with a cylinder cover with a seal ring. The two ends of a double-head piston rod extend into the piston cylinders in the left containing cavity body and the right containing cavity body respectively. Magnetic coils are wound around the two ends of the double-head piston rod respectively. A connecting rod extends downwards from the middle of the upper shearing plate. The connecting rod is connected with the middle of the double-head piston rod. The upper shearing plate conducts movement in the longitudinal direction and the transverse direction on the plane relative to the lower shearing plate under the action of the connecting rod and the double-head piston rod. By the adoption of the shearing type double-cylinder magneto-rheological damper, a primary vibration damping area of a vibration roller is obtained, and damping can be adjusted according to needs.

The invention discloses an ultra-thin speaker and its portable audio system, comprising a magnetic circuit device and a vibrating device matched with the magnetic circuit device. The outer magnetic ring matched with the groove on the circumferential surface, the inner magnetic ring matched with the pit in the middle of the T iron, and the washer matched with the inner magnetic ring; the washer and the A gap is provided between the inner side walls of the pits, and the voice coil of the vibrating device is inserted into the gap. With this structural design, compared with traditional speakers, the thickness of the speaker can be effectively reduced, the efficiency of the magnetic circuit can be improved, and the sound quality of the speaker can be improved.