98results about How to "Reduce magnetic flux" patented technology

In an electric power steering apparatus that generates an auxiliary steering torque by a brushless motor in response to a steering torque applied on a steering wheel and transmits it to an output shaft of a steering mechanism while reducing it by means of a reduction gear, the apparatus comprises a rotor ( 10 ) to which a cylindrical permanent magnet for rotational driving ( 12 ) and a member to be detected ( 13 ) for detection of a rotational angle of the rotor are attached and a cylindrical stator ( 30 ) opposed to the rotor in which a laminated core ( 16 ) on which a coil is wound, detection means ( 17 ) for detecting the rotational angle of the rotor by the member to be detected and a terminal ( 19 ) for providing connection to the coil are integrally formed by resin molding. At least one bearing ( 8, 9 ) for rotatably supporting the rotor is disposed radially inside the stator and between the permanent magnet for rotational driving and the member to be detected.

Inductive power transfer flux coupling apparatus includes a first coil arranged in a first layer and configured to generate or receive a magnetic coupling flux in a flux coupling region, and a second coil. At least part of the second coil being arranged in a second layer and is configured to generate a magnetic flux that reflects flux from the first coil,

The purpose of this invention is to obtain a permanent magnet embedded type rotating electric machine in which the amount of magnetic flux of a permanent magnet can be prevented from reducing and the permanent magnet can be effectively cooled. In the permanent magnet embedded type rotating electric machine, a rotor (15) has: a rotor iron core (17) constructed by laminating and integrating magnetic steel sheets and firmly fixed to a shaft; a plurality of magnet housing openings (20) each formed so as to penetrate in an axial direction on the outer circumferential side of the rotor iron core (17) and disposed in a circumferential direction; and permanent magnets (21) housed in the respective magnet housing openings (20). An adhesive agent (22) is disposed only between the outside wall surface (20a) of the inner wall surfaces of each of the magnet housing openings (20), which is positioned outward in the radial direction, and the outside surface (21a) of the surfaces of each of the permanent magnets (21), which is positioned outward in the radial direction. The permanent magnets (21) are each disposed one-sided to the outside wall surface (20a) of each of the magnet housing openings (20) and fixed. A cooling flow path (23) through which a refrigerant flows is constituted by the inside surface (21b) of the surfaces of each of the permanent magnets (21), which is positioned inward in the radial direction, and the inside wall surface (20b) of the inner wall surfaces of each of the magnet housing openings (20), which is positioned inward in the radial direction.

The invention discloses combined magnetizing permanent magnet built-in rotor of an axial magnetic field permanent magnet motor. The rotor structurally comprises two rotor discs installed on a rotatingshaft, the first rotor disc comprises a rotor iron core, permanent magnets, a rotor supporting shell and a rotor back yoke, the permanent magnets comprise the first permanent magnet and the second permanent magnet, and the rotor iron core comprises a rotor outer iron core and a rotor inner iron core; the rotor back yoke is installed on the rotor supporting shell, and the first permanent magnets and the second permanent magnets are alternately and evenly arranged on the rotor back yoke in the circumferential direction. The rotor core is fixed to the second permanent magnets arranged on the rotor back yoke together so as to keep the permanent magnets fixed in the radial direction and the axial direction; the rotor iron core, the permanent magnets, the rotor supporting shell and the rotor back yoke are fixed together to form the first rotor disc which is installed on the rotating shaft, and then the first rotor disc is connected with the second rotor disc through the rotating shaft to fix the position of the second rotor disc in the axial direction to form a double-rotor structure. The permanent magnet rotor is good in magnetism gathering effect, high in air gap flux density and large in reluctance torque.

A motor includes a stator core fitted to a cylindrical portion of a case, a rotor core being rotatable in the stator core, soft magnetic poles radially extending from the rotor core, and magnet poles disposed between the soft magnetic poles. The case includes a bottom portion having a ring-shaped plate portion, a protrusion portion, and a bearing-supporting portion extending from the protrusion portion. A condition that L2≧t and a condition that L1≧L2 are met, wherein t represents a thickness of the bottom portion, L1 represents a distance in an axial direction between a side surface of the ring-shaped plate portion close to the stator core and a protrusion end of the protrusion portion close to the rotor core, and L2 represents a distance in the axial direction between the side surface and an end surface of a bearing opposite to the rotor core.

The invention relates to a rotor and an electric machine (10) in particular for the motorized adjustment of a movable part in a motor vehicle, and a method for producing such the rotor. The rotor comprises a rotor shaft (14), a rotor assembly (16) for containing a rotor winding (30) is fixed to the rotor, and the rotor assembly (16) comprises an end plate (20) made of metal. The rotor is characterized in that at least one end plate (20) comprises a sleeve (24) made of metal, and the sleeve extends along the axial direction from a disk-shaped plate body (22) of the end plate (20) and encloses the rotor shaft (14).

A viscous clutch (30; 30') includes a stationary journal bracket (32; 32') defining a mounting shaft (32-1; 32-1'), an output member (34; 34') rotatably supported on the mounting shaft about an axis (A), an input member (34; 34') rotatably supported on the mounting shaft about the axis, and a working chamber (50; 50') defined between the input member and the output member to selectively transmit torque there between when a shear fluid is present. The mounting shaft extends axially through the viscous clutch from a front face (62; 62') of the viscous clutch to a rear face (56; 56') of the viscous clutch, with the rear face defining a mounting surface for mounting the viscous clutch at a mounting location. The front and rear faces are located at opposite sides of the viscous clutch and face in opposite directions.

The invention provides an electrical line-start motor comprising with a stator and a squirrel cage rotor adapted for rotation around a centre axis. The rotor comprises a squirrel cage winding in which a current is induced by corresponding windings of the stator, and a set of permanent magnets. To protect the magnets from excessive heat, the rotor comprises thermal barriers e.g. in the form of cavities located between the squirrel cage winding of the rotor and the magnets. Due to the thermal barriers, the thermal conductivity in a path between the windings and the magnets are reduced and the magnets are protected.

Provided is an induction heating apparatus of a C-shaped inductor, which can restrain spiral copper pipe heating, and magnetic flux reduction which is the reason of copper loss, and can not reduce the heating efficiency of the end portion of a heated piece. The induction heating apparatus is in pairs provided with fixed C-shaped inductors formed by C-shaped iron core structures at two end portions of a heat piece in the width direction, characterized in that the C-shaped inductor is composed of a main body iron core portion which is provided with an opening used for passing through a heated piece along the conveying direction of the heated piece; an iron core leg portion in connection with the opening portion and formed in a mode of clamping the opening portion up and down; and a heating coil which clamps the opening portion and winds the up and down iron core leg portion, allows linkage between the heated piece and magnetic flow so as to heat a piece to be heated, and is winded in a mode in which the winding diameter of the heating coil gradually expands towards the end portion of the surface opposite to the opening portion.

The invention discloses a shear mode magnetorheological elastomer frequency conversion vibration isolator comprising a bolt, magnetorheological elastomer, a shell, an upper cover plate, a lower cover plate, a sealing ring, a magnet, a magnet outer cover, a magnet cover plate and a spring. The bolt is fixed in the middle of the magnetorheological elastomer via a connecting nut; the magnetorheological elastomer and the shell form a magnetorheological elastomer assembly; the two ends of the shell are matched with the upper cover plate; the upper cover plate, the lower cover plate and the magnetorheological elastomer assembly form a closed space; the sealing ring, the magnet outer cover and the magnet cover plate divide the closed space into an upper cavity and a lower cavity; the magnet is installed between the magnet outer cover and the magnet cover plate; the magnet outer cover and the magnetorheological elastomer assembly are connected through the spring. Through the movement of the magnetorheological elastomer, the positions of the magnet and the magnetorheological elastomer change relatively, so that the frequency conversion and the vibration isolation under multi-frequency working state are realized.

A brake is provided. The brake may include a rotor having a plurality of magnets and a plurality of ferromagnetic poles radially disposed thereabout, and a stator having a plurality of shunts and a plurality of teeth radially disposed thereabout. At least one of the plurality of shunts and the plurality of teeth may be configured to selectively move between an engagement state and a free engagement state. The teeth may be configured to generate magnetic flux with the ferromagnetic poles so as to generate a braking torque during the engagement state. The shunts may be configured to redirect the magnetic flux therethrough and reduce the braking torque between the teeth and the ferromagnetic poles during the free engagement state.

The invention relates to a deceleration buffer magnetic shield rotating shaft which comprises a rotating shaft body arranged at the axis position of a rotor, narrow iron plates, wide iron plates, a casing and a buffer seat, wherein the narrow iron plates and the wide iron plates are uniformly distributed on the surface of the rotating shaft body in the axial direction of the rotating shaft body at equal intervals; a magnetic shield bushing and a fixing sleeve are arranged between every two adjacent iron plates; a wind flowing plate is arranged on the outer side of each fixing sleeve; a key groove is formed in the tail end of each wide iron plate; a through hole and a through groove are respectively formed in the side face of each iron plate; a bump is arranged on the rotating shaft body; the casing is arranged on the outer side of the bump; the buffer seat is arranged at an inlet of the casing; symmetrical springs are arranged between an elastic sleeve between the buffer seat and the bump and the buffer seat; a friction piece is arranged on the elastic sleeve; a buffer tube is arranged in the buffer seat. A motor rotating shaft disclosed by the invention has the advantages of reduced integral weight, low energy consumption, good heat radiating performance and low work load; the rotating shaft is not easy to damage, so the maintenance cost is low and the service life is long.

The invention discloses an external rotor motor. The external rotor motor comprises a stator formed by stacking stator punching sheets, permanent magnets and a rotor magnet yoke, wherein the permanentmagnets are the ones with non-uniform thickness; the plurality of permanent magnets are uniformly annularly arranged on the inner side surface of the rotor magnet yoke; the stator punching sheets areplaced on the inner sides of the permanent magnets; the permanent magnets with non-uniform thickness are magnetized in an unequal-diameter magnetizing manner; the permanent magnets with non-uniform thickness provides magnetic flows as well as magnetic circuits. The external rotor motor is reasonable in design; the permanent magnets with non-uniform thickness are magnetized in the unequal-diametermagnetizing manner, so that the magnetic flows are concentrated at the center of magnetic poles, the closed magnetic circuit is formed between the adjacent permanent magnets with non-uniform thickness, the magnetic flux passing through the closed rotor magnet yoke is reduced, and thus higher power can be output under a same size, the power density of the motor is improved, and the requirement onthe material of the rotor magnet yoke is also reduced.

The invention relates to a switching device comprising an electromagnetic arc driving mechanism and an arcing chamber that includes a stationary switching piece (1) and an opposite movable switching piece (4). The invention is characterized in that the electromagnetic arc driving mechanism is embodied in the form of a metal sheet (8) that is placed around the stationary switching piece (1).

The invention relates to the technical field of a permanent magnet motor, and particularly relates to a rotor with an automatic flux weakening structure and a permanent magnet motor. The rotor comprises a plurality of permanent magnet installation rotary table units overlaid sequentially; each permanent magnet installation rotary table unit is provided with a plurality of permanent magnet insertion through holes and a magnetic conductive powder accommodation cavity; each two adjacent permanent magnet insertion through holes are communicated by a magnetic conductive powder compensation passage;each magnetic conductive powder compensation passage is communicated with the magnetic conductive powder accommodation cavity and a critical switching valve is arranged at the joint; when the rotor rotates at a high speed, the magnetic conductive powder compensation passages are communicated with the magnetic conductive powder accommodation cavity, a leakage magnetic flux is increased, and a magnetic flux passing through an air gap is reduced, so as to implement flux weakening; the rotating speed is reduced, a centrifugal force applying to magnetic conductive powder is gradually reduced, andwhen the magnetic conductive powder compensation passages move to the highest point, the magnetic conductive powder is returned to the magnetic conductive powder accommodation cavity and a value of the magnetic flux passing through the air gap is returned to a normal state; and the automatic flux weakening and speed expansion are implemented, the rotor and the permanent magnet motor are easy for motor control, and meanwhile, motor efficiency and a power density can be improved.

The invention discloses electronic equipment. Electromagnetic induction principle, the LC resonance circuit resonates at a fixed resonance frequency and generates a magnetic field when the key is notpressed; press key, the metal sheet generates a magnetic field which is mutually exclusive to the magnetic field under the action of the magnetic field; when the key is pressed, the magnetic flux of the magnetic field of the LC resonance circuit passing through the inductance coil is equivalently reduced, the inductance value of the inductor is reduced, the resonance frequency of the LC resonancecircuit is increased finally, and finally, whether the key is pressed or not can be determined based on the resonance frequency of the LC resonance circuit. Compared with a mechanical key in the priorart, the key is simple in structure, the metal sheet can deform through the key with small force, key pressing is further detected, the key provides the hand feeling of the mechanical key, and in addition, the situation of false triggering is not likely to happen.

An electromagnetic actuator having a permanent magnet coupled to an armature of the electromagnetic actuator is provided. The electromagnetic actuator includes a housing, a pole piece arranged within the housing and secured by an end plate, and an armature assembly having an armature and a permanent magnet coupled to the armature. The armature is movable between a first position and a second position. The electromagnetic actuator further includes a wire coil positioned around the armature assembly and arranged within the housing. An actuation position of the armature between the first position and the second position is proportional to a magnitude of current applied to the wire coil.

A permanent magnet type motor with a permanent magnet, capable of reducing vibration and noise without lowering the motor efficiency, which comprises a stator (1) having multi-phase stator windings, and a rotor (10) disposed inside the stator in opposed relation through air gaps, and having a stator core (12) and permanent magnets (14) installed in the stator core, wherein the permanent magnets (14) are so shaped that their section at right angles with the axis of rotation is convexed on both inner and outer diameter sides and that the focus of magnetism orientation in each magnet pole of the permanent magnet (14) is disposed outside the rotor (10).

The embodiment of the invention provides a headset and belongs to the field of electronic equipment. The headset comprises a shell and a net cover which are arranged in a split mode. A sound outlet is formed in the shell. The net cover covers the sound outlet. The net cover is made of magnetic shielding materials. A loudspeaker assembly is arranged in the shell and provided with a magnetic circuit unit. According to the headset, the net cover and the shell are arranged in the split mode, and the net cover covers the sound outlet of the shell; due to the fact that the net cover is made of the magnetic shielding materials, the outward-radiation magnetic flux of the magnetic circuit unit of the loudspeaker assembly can be reduced, the magnetic flux on the periphery of the net cover is greatly reduced, the attraction force of the magnetic circuit unit to external ferromagnetic substances is effectively weakened, the phenomenon that the ferromagnetic substances are attracted into a vibration film of the loudspeaker assembly through the net cover and the sound outlet is avoided, and it is ensured that the sound quality effect of the headset is not affected and the service life of the headset is prolonged.