904 results about "Magnetic current" patented technology

A method and system for providing a magnetic element is disclosed. The method and system include providing a pinned layer, a magnetic current confined layer, and a free layer. The pinned layer is ferromagnetic and has a first pinned layer magnetization. The magnetic current confined layer has at least one channel in an insulating matrix and resides between the pinned layer and the free layer. The channel(s) are ferromagnetic, conductive, and extend through the insulating matrix between the free layer and the pinned layer. The size(s) of the channel(s) are sufficiently small that charge carriers can give rise to ballistic magnetoresistance in the magnetic current confined layer. The free layer is ferromagnetic and has a free layer magnetization. Preferably, the method and system also include providing a second pinned layer and a nonmagnetic spacer layer between the second pinned layer and the free layer. In this aspect, the magnetic element is configured to allow the free layer magnetization to be switched using spin transfer.

A boost converter utilizing bi-directional magnetic energy transfer of coupling inductor provides a high efficiency boost DC-DC converting with above 30 times voltage boost rate, which uses a coupling inductor and low voltage switch to absorb circuit induction voltage of a passive regenerative snubber no matter if switch is turned on or off. Such that, a much higher voltage boost rate than the turn rate of transformer and wider range of switching duty cycle is obtained. A bi-directional magnetic energy path is utilized, that is, when switch is turned on the first winding of coupling inductor stores magnetic excited high current energy, and opposite magnetic flux is induced on the second winding at the same time. When switch is turned off the magnetic excited current continues and increases the voltage on the second winding. The second winding has bi-directional magnetic current induced and fully utilizes capacity of transformer's iron core.

This invention relates to one gas wheel motor rotor coil shortcut online test method in the test technique field, which comprises the following steps: through online real time collecting motor electrical parameter data and according to one certain work situation motor electrical parameter data to compute normal current theory values by reverse rotor normal current; then computing excitation magnetic current real value and theory value relative bias; the bias difference is as generation motor set to judge whether there is coil short cut fault as dialogue of the shortcut fault.

Construction variable rotary magnetic current flowing deforming brake, mainly comprises a bearing end cap, sealing cap, magnetic conduction inside tube and outside tube, magnet coil, rotation shaft, positioning key, bearing, magnetic current variation liquid, rotating disc and sealing material, wherein the magnetic conduction inside tube and outside tube are both cylinders made of magnetic conduction material, and a separating arrangement is arranged on the magnetic conduction inner tube, the rotation shaft crosses the the magnetic conduction inner tube and connects with the rotating disc, the magnet coil is adhered into the magnetic conduction outer tube, and encloses the magnetic conduction inner tube, the magnetic current flowing deformation liquid is injected into the magnetic conduction inner tube, the separating arrangement is arranged on the magnetic conduction inner tube divides the brake into two chambers, which can determine to mount one or two rotating discs. The brake according to the invention can increase the magnetic current flowing deformation efficiency, and guarantees a large damping moment for the brake.

An electrode for use in a flow cell is presented. The electrode includes a metal plate for collecting current in the electrode that is bonded between a first and second plate.

The invention presents a self-supplied magnetic current damper, which includes a magnetic current damper, a vibration energy collector, and an energy storage management module. The energy collector is a multi-vane disc shaped electro-magnetism type mechanical energy collector installed on the piston bottom of the magnetic current damper, which is composed of multiple impellers and disc shaped magnetoelectric transducers, wherein, the disc shaped magnetoelectric transducers are mounted on the piston, the multiple impellers are mounted on the rotor of the disc shaped magnetoelectric transducers, and the energy produeced by the disc shaped magnetoelectric transducers is lead out by the coil on the stator. The output lines of the disc shaped magnetoelectric transducers are connected to the energy storage management module, and the output of the energy storage management module is connected to the magnetizing coil of the magnetic current damper. During work, the magnetic current liquid impacts the vanes, the impeller converts the fluid washing into the rotation of the disc shaped stator inlaid on the rare-earth permanent magnet, the magnetic flux of the coil on the disc shaped stator is changed, in order to achieve effective collection of mechanical energy, and greatly reduce the transducer volume.

A kind of inversion magnetic current alter amortisseur,which has application in the absorption of vibration of the building structure and the locomotive cars. It includes the cylinder body,the piston, the piston rod which connected to it, the confinement gasoline device of the both sides of the cylinder body and the cylinder cap, there has magnetic current alternative liquid in the void of the cylinder body, and institutes the magnetizer that generates the magnetic field and the energizing coil and the electromagnet magnetic circuit component which is unitized of the running void, the cylinder body is composed of the master cylinder, or the master cylinder and the set jar, or the master cylinder and bypass jar, its character is:Institutes both the energizing coil and the permanent magnet magnetic circuit, composes the compounded magnetic circuit with the energizing coil and the permanent magnetic field, and also institutes the administer void in the electromagnet circuit, and when the power is cut, the most of the permanent magnetic field that generated by the permanent magnet will pass through the running void, so the amortisseur can work at the great amortization condition. The component of the electromagnet circuit may set at the pertinent position in terms of the different cylinder body. This kind of amortisseur can joint with the controlled structure, fulfills the semiactivly controlled with the absorption of vibration.

The invention provides a self-pressurized high-speed polishing method for the inner surface of a hole by means of abrasive particles and a magnetic flow. According to the method, the abrasive particles are coated with and restrained on the inner surface of the hole of a workpiece by the aid of ferromagnetic particles in a magnetorheological polishing fluid, which flows at a high speed, under the effect of a magnetic field produced by moving magnetic bodies, a flexible polishing abrasive brush flowing at a high speed is formed and reciprocates to rub against the inner surface of the hole of the machined workpiece to remove burrs and reduce the roughness of the inner surface of the hole, and burr removal and deterministic polishing are realized for various types of inner surfaces of holes. The invention further provides a self-pressurized high-speed polishing device for the inner surface of the hole by means of the abrasive particles and the magnetic flow. The device comprises a polishing mechanism, the magnetic bodies, a clamping mechanism, a sliding guide rail and a driving motor, wherein the driving motor drives the magnetic bodies to enable the polishing fluid to reciprocate in the hole at the high speed for polishing. The method and the device can solve problems that special holes are difficult to polish and the polishing efficiency is low, and have the advantages of high precision, high machining efficiency, low damage and low cost.

The invention discloses a magnetorheological hydraulic engine mount based on an extrusion mode, which comprises a housing, a rubber main spring, a connecting rod and a rubber bottom membrane, wherein a decoupler is arranged between the rubber main spring and the rubber bottom membrane; a field pole plate is fixedly arranged on the connecting rod, close to the decoupler; a field coil is wound in the field pole plate; an extrusion pole plate is arranged on the decoupler, corresponding to the field pole plate; and an extrusion damping channel is formed between the extrusion pole plate and the field pole plate and fully filled with magnetorheological fluid. The magnetorheological hydraulic engine mount adopts the extrusion mode, and the field pole plate arranged on the connecting rod forms the extrusion damping channel with the extrusion pole plate on the decoupler, so that the vibration isolation capability of the mount is improved. In addition, the extrusion mode can satisfy a maximum output damping force and expand an adjustable range of the damping force.

The inventive vibration absorber comprises an execution unit, a control unit and a sensor. The execution unit consists of a magnetic inductor, a coil, a magnetic rheological elastic body, a vibration-absorbing mass block and a base. The above magnetic inductor consists of inner and outer sleeves, or a U-shaped iron-core and an armature or top and bottom plates and a column iron-core. Between inner and outer sleeves, the U-shaped iron-core and the armature or the top and bottom plates are filled the magnetic rheological elastic bodies. By regulating the voltage on the coil, the rigidity and the elasticity of the magnetic rheological elastic body are regulated to make its vibration frequency change, so as to make the vibration frequency of the vibration absorber execution unit is the same as that of the vibration-damping object.

A compact and failsafe magnetorheological energy absorber design including both a light weight piston (LWP) embodiment in which linear motion is subjected to a linear damping force, and a light weight rotary vane (LWRV)embodiment in which linear motion is converted into rotary motion and is subjected to a rotary damping force. Both embodiments allow increased damper stroke within a compact mechanical profile. A new lightweight Magnetorheological energy attenuation system (LMEAS) for a vehicle seat is also disclosed using the new LMRW MREA.

Systems and methods relating to a clutch system for use in controllably transmitting torque from an input shaft to an output shaft. The clutch system has a torque transmission fluid that has a viscosity that changes based on the strength of an electromagnetic field passing through the fluid. A number of sensors are placed at different radial locations on the torque transmission disks to detect the strength of the electromagnetic field. Based on the strength of the electromagnetic field, the amount of torque being transmitted from the input shaft to the output shaft can be adjusted. Also disclosed is a distributed actuation architecture that uses this clutch system. The distributed actuation architecture allows for the use of a single drive motor in conjunction with multiple instances of the clutch system to actuate a mechanical linkage, such as a robotic arm.

The invention relates to a multiple-disc type magnetorheological brake which mainly comprises a transmission shaft, a wheel hub, a drive friction plate group, a driven friction plate group, inner and outer magnetic isolation rings, an exciting coil with a U-shaped iron core, magnetic-conducting side plates and a magnetic isolation casing. A sealing ring is used for sealing magnetorheological fluid between the drive friction plate group and the driven friction plate group; the drive friction plate group and the driven friction plate group are respectively sleeved on the magnetic isolation rings and the wheel hub through splines; the drive friction plate group is separated from the driven friction plate group by the inner magnetic isolation ring and the outer magnetic isolation ring; the exciting coil with the U-shaped iron core is directly spliced in iron core jacks of the magnetic conducting side plates; and the braking torque can be changed through changing the current intensity of the coil. When the braking torque is not enough, the quantity of friction plates can be increased or the quantity of the exciting coil with the U-shaped iron core can be increased to adapt to the big torque braking. The multiple-disc type magnetorheological brake has the advantages that the structure is compact, the braking torque is big, the assembly and the disassembly are convenient, the coil is easily used for radiating the heat, and the number of turns wounded by the coil is more.

The invention relates to an engine vibration isolation device of a magneto-rheological fluid damper in extrusion mode and a magneto-rheological elastomer in shearing mode for supporting static loads. The vibration isolation device comprises two pars of a damping adjusting unit and a rigidity adjusting unit; the damping adjusting unit is connected with the rigidity adjusting unit through a rigid connecting rod; the vibration of an engine causes the connecting rod to move upwards and downwards, so that the magneto-rheological fluid in the damping adjusting unit flows in radial direction and shearing occurs to the magneto-rheological elastomer in the rigid adjusting unit; a magnetic field generated by two exciting coils can be respectively adjust damping parameters and rigidity parameters of a vibration isolator. The magneto-rheological vibration isolator can meet the independent adjustment of the damping parameters and the elastic parameters of the vibration isolator under different vibrational excitation conditions, and achieve the coupling control of the transmission of engine vibration energy, and has great realistic significance in improving the technical level and market competence of special vehicles.

The invention discloses a double-flexible-grinding-head magnetorheological polishing device. In the device, a vertical gantry of a bed body and an X-axis are both fixed on a horizontal base; a worktable is fixed on a sliding block of the X-axis; a Y-axis is fixed on a horizontal beam of the vertical gantry; and a first Z-axis and a second Z-axis are arrangedon the Y-axis in parallel. A large flexible grinding head is installed on the first Z-axis; and a small flexible grinding head is arranged on the second Z-axis. A high-flow circulation system connected with the large flexible grinding head and a low-flow circulation system connected with the small flexible grinding head are arranged on a trolley. A control cabinet is arranged at the rear part of the vertical gantry; and a circulation system cabinet and a cleaning system are arranged at the side surface of the vertical gantry. The double-flexible-grinding-head magnetorheological polishing device provided by the invention has the advantages of high accuracy, high rigidness, high stability and high dynamic property. The double-flexible-grinding-head magnetorheological polishing device not only can be used for processing of large-caliber phase elements, but also can be used for high-accuracy processing of large-caliber planar optical elements within the range of full caliber. The optimal matching of the processing efficiency and the processing accuracy can be realized.

A magnetic tunnel transistor (MTT) having a pinned layer that has no antiferromagnetic material in an active area of the sensor. The MTT can include a layer of antiferromagnetic material that is exchange coupled with the pinned layer in an area outside of the active area of me sensor, such as outside the track-width, beyond the stripe height, or both outside the track-width and beyond the stripe height. The pinned layer can also be pinned without any exchange coupling at all. In that case, pinning can be assisted by shape enhanced magnetic anisotropy, by extending the pinned layer beyond the stripe height.

The invention discloses an MR polishing slurry cycle device which has longtime and stable polishing slurry performance. The liquid mixture tin is connected with the water tank through a metering pump and the cooling machine is connected with the liquid mixture tin through the cooling pipe; a polishing slurry circulation loop consists of the successively connected liquid mixture tin, electromagnetic flow meter, nozzle, recovery unit and recovery pump through a polishing circulation pipeline and a non-polishing slurry circulation loop consists of the successively connected liquid mixture tin and electromagnetic flow meter through a non-polishing circulation pipeline. The polishing slurry circulation loop and the non-polishing slurry circulation loop are connected in parallel and a switching control valve is arranged at the junction. The lateral pipe between the liquid mixture tin and the switching control valve is surrounded with spiral coil; the electromagnetic flow meter and the spiral coil are connected with the input terminal of the computer, of which the control output terminal is connected respectively with the switching control valve, the cooling machine, the power pump and the metering pump. The device has the advantages of high control precision, sound stability, etc., and can provide low cost, reliable and stable MR polishing slurry for MR polishing processing for a long time.

The invention discloses a semi-active magnetic-current variable-piezoelectric feedback type damper, comprising an inner tube and an outer tube. A revolving shaft is arranged in the middle of the innertube, and is fixedly connected with two vanes which are arranged by the angle of 180 degrees in the inner tube. The vanes are hollow and provided with mass blocks inside respectively, the upper and lower ends of each mass block are connected with the inner wall of the corresponding vane through springs. Two thin plates are arranged in the inner tubes and perpendicular to the vanes respectively. The cavity of the inner tube is filled with magnetorheological fluid. Piezoelectric generator units are respectively arranged on the surfaces of the thin plates, and pressure sensors are respectively arranged at the tops of the piezoelectric generator units. The outer wall of the inner tube is wound with a field coil along the axis direction. The pressure sensors, the field coil, a controller and an electric power extracting and storing unit are in series connection to form a closed loop, wherein the controller and the electric power extracting and storing unit are arranged at the top of the inner tube.