1271 results about "Magnetic isolation" patented technology

The present invention relates to a gas-liquid mass transfer and reaction equiopment of high-pressure rotating bed in ultragravity force field. Said invention drive equipment is a magnetic drive equipment, including driving portion, driving magnetic stell protecting cover positioned on the exterior of the machine shell and driving magnetic steel and driving shaft which are placed in the protecting cover and driven portion, driven magnetic steel protecting cover positioned in the interior of the machine shell and driven magnetic steel and driven shaft which are placed in the driven magnetic steel protecting cover. The driving portion and driven portion are separatedy by means of magnetic isolation cover between both them. Said invention adopts band pressure design and measures of internal and internal magnetic steel protecting cover, magnetic steel cooling system, high-effective coating layer and others so as to raise mass transfer effect.

The invention provides a high-power permanent-magnet motor rotor especially suitable for high-power permanent-magnet synchronous windmill generators, an installation method of the rotor and a method for magnetizing a permanent magnet. By adopting a permanent magnet embedded structure, the rotor is divided into a plurality of axial rotor units, and the iron core between every adjacent two pole permanent magnets of each rotor unit is provided with a rotor-axial magnetic isolation groove which is fixed by a partition between an end plate and the rotor unit. The rotor not only avoids magnetic leakage and enhances the intensity, but also simplifies the manufacture and assembly of the rotor as well as the magnetizing procedure of the permanent magnet, thereby enhancing the production efficiency.

A method for the isolation and purification of nucleic acids such as DNA, RNA, and PNA from various sources using magnetizable cellulose or its derivatives. Adjusting the concentrations of the salt and polyalkylene glycol to the levels that result in binding of nucleic acids to the magnetizable cellulose or its derivatives. Separating the nucleic acids bound to the magnetizable cellulose particles or its derivatives and eluting the nucleic acids from the particles.

The invention relates to a multi-disc type magneto-rheological stepless speed changer which mainly comprises a magnetic isolation hub, an input shaft, an output shaft, a driving friction plate, a driven friction plate, magnetic exciting coils and magnetic isolation rings; wherein the driving friction plate and the driven friction plate are respectively fixed on an outer magnetic isolation circular ring and the magnetic isolation hub through the magnetic isolation rings; a right magnetic conducting lateral plate is connected with the input shaft through a big magnetic isolation circular ring and a left magnetic conducting lateral plate; the output shaft is connected with the driven friction plate and the magnetic isolation hub; magneto-rheological fluid is sealed between the driving friction plate and the driven friction plate through a seal ring; the magnetic exciting coils are fixed on two bearing seats through a magnetic conducting shell, the left magnetic isolation lateral plate and the right magnetic isolation lateral plate in a motionless way, and the driving friction plate and the driving friction plate are in interleaved matching and isolated through the magnetic isolation rings. The shear yield stress of the magneto-rheological fluid can be changed by adjusting the electric current of the magnetic exciting coils, therefore, the speed difference between a driving shaft and a driven shaft is changed, and the stepless speed change is further realized. The invention has the advantages of simple structure, no electric sparks, high transmission torque and large transmission power.

The invention discloses a rotor gravity unloading type magnetic bearing composite motor comprising an external stator, an armature winding, a permanent magnet, a rotor, a magnetic isolation aluminum ring, an internal stator and a suspension control winding. The armature winding is wound in external stator slots. The magnetic isolation aluminum ring is embedded in the rotor. A Halbach type permanent magnet array is surface-mounted on the surface of the rotor. The internal stator has seven internal stator poles including two opposite bias flux magnetic poles, four radial suspension control poles and one gravity direction rotor weight unloading pole. Radial magnetized permanent magnets are surface-mounted on the surface of the bias flux magnetic poles. The suspension control winding is wound on the four suspension control poles. Coupling between the suspension winding and the armature winding in the conventional magnetic suspension motor can be eliminated, and the influence of the rotor weight on suspension control in the conventional suspension motor can also be greatly solved so that the rotor is enabled to stably work at the central balance position without increasing suspension control current, and low power consumption and stable suspension of the magnetic bearing composite motor can be realized.

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.

A recording medium according to the invention has a magnetic recording layer with an L1₀ magnetic material deposited with a (111) preferred orientation and soft underlayer (SUL). One set of embodiments includes an intermediate layer (seed layer or underlayer) between the L1₀ media and SUL. The intermediate layer can be a close-packed surface structure (triangular lattice) to promote (111) orientation of the L1₀ media. For example, the intermediate layer can be a (111) oriented, face-centered-cubic (fcc) material such as platinum, palladium, iridium, rhodium, FePt, FePd, or FePdPt alloys; or the intermediate layer can be a (100) oriented hexagonal-close-packed (hcp) material such as ruthenium, rhenium, or osmium. Alternatively, the intermediate layer can be an amorphous material. The L1₀ recording layer of the invention can be deposited with a matrix material to form grain boundaries and provide magnetic isolation of the grains of L1₀ material.

The invention relates to a rotor of a high-quality and high-speed built-in permanent magnet motor and a magnetic steel structural parameter determining method thereof. In the invention, the whole section magnetic steel of each electrode of the rotor of a conventional built-in permanent magnet motor is divided into multiple sections of magnetic steel which have the same polarity and different widths; the multiple sections of the magnetic steel are respectively arranged in a rotor core; and reinforcing ribs with the function of magnetic isolation are arranged among the multiple sections of the magnetic steel. By reasonably modulating and determining the width and distribution of each section of the magnetic steel, the air gap magnetic density waveform approaches sine distribution; harmonic components are reduced to the greatest extent; the eddy current loss of the magnetic steel and the torque pulsation of the motor are simultaneously reduced; and the electromagnetic performance of the motor is enhanced. Furthermore, the multiple sections of the magnetic steel are arranged in the circumference along the rotor; the highest rotating speed of the safe operation of the rotor is greatly enhanced on machinery; the radial thickness which is needed by the magnetic circuit of the rotor is obviously reduced on the structure; the rotational inertia and weight of the rotor are reduced; the dynamic response of the motor is improved; and the requirements of a high-speed driving system on the performance of the motor are met.

High temperature gate driving circuits with improved noise resistance and minimized loss are implemented with high temperature components with a reduced size magnetic isolation transformer. Input broad-pulse width modulated signals are converted to offsetting narrow pulses to cross the reduced size magnetic transformer minimizing isolation losses. One embodiment teaches time and voltage offset narrow single pulses that control a set and reset regeneration of the pulse width output on the secondary side of the transformer. Another embodiment teaches multiple concurrent voltage offset pulses to cross the transformer and charge a threshold capacitor for both filtering noise and controlling the pulse width regeneration on the secondary side of the transformer.

The solid power switch control method uses MPU and PLD for integrated control and management, and completes the communication with bus of up machine. Wherein, using MPU to integrated control and protect the I2T and PLD to logic synthesize control signals of all channels; using level-control magnetic isolation drive protective circuit with voltage bootstrapping function; sharing one high-frequency demodulation signal for multipath drive; using rating code function to make MPU online recognize rating of every power plate and distinguish different I2T tripping curve. This invention increases power density of solid power switch, and reduces volume and weight.

The invention discloses a thick-film magnetic isolation direct current solid-state power controller which comprises a power MOSFET (metal oxide semiconductor field effect transistor), a detection resistor, a power diode, a TVS (transient voltage suppressor) diode, a current conditioning circuit, a voltage detection circuit, a voltage state judgment circuit, a current state judgment circuit, an immediate trip circuit, an inverse time circuit, a short-circuit detection circuit, a driving circuit, a state synthetic circuit, a trip state latch circuit, a time delay reset circuit, a time sequence matching circuit, a DC/DC (direct current/direct current) isolated power supply, a first isolation circuit, a second isolation circuit, a third isolation circuit, a state feedback interface circuit, a control signal interface circuit and a power-on reset circuit. The circuit structure can optimize the electrical properties of the controller, reduce the volume and the weight, improve the reliability and is widely applied to civil low-voltage direct current power distribution systems, aviation, aerospace, tanks, automobiles, ships and other fields.

The invention discloses a monopropellant thruster electromagnetic valve, which comprises a filter component (1), an inlet joint (2), a locking nut (3), a guide spring (4), a lead wire (5), an upper valve body (6), a magnetic isolation ring (7), an armature lever (8), an armature (9), an external magnetizer (10), a flange plate (11), a sealing spring (12), a baffle plate (13), a valve seat (14), a coil (15) and a lower valve body (16), wherein the guide spring (4) is a single-arm circular flat spring; and the sealing spring (12) is a double-arm S-shaped circular flat spring. Two flat springs with large radial stiffness and different axial stiffnesses are adopted for joint supporting, and the armature component is suspended in a valve body of the electromagnetic valve and not in contact with the inner wall of the electromagnetic valve, thereby avoiding the possibility of self-pollution of the electromagnetic valve caused by redundancy materials generated by friction between the armature component and a framework of the valve body during the opening and the closing of the electromagnetic valve, and improving reliability in the opening and the closing of the electromagnetic valve and sealing reliability.

The invention discloses a device for testing rheological properties of magnetorheological fluid, comprising a support, a motor, a rotating shaft, a static shaft and a shell. The device is characterized in that the lower end of the rotating shat extends into the shell and the lower end part of the rotating shaft is fixedly provided with a rotating disc, the upper end of the static shaft extends into the shell and the upper end part of the static shaft is fixedly provided with a static disc, a magnetic isolation disc and an annular magnetorheological fluid cavity are arranged between the rotating disc and the static disc, a sealing ring is sleeved on the static disc, the shell is internally provided with a magnetic isolation ring and an exciting coil, the magnetic isolating ring is arrangedbetween the sealing ring and the exciting coil, the support is fixedly provided with a torque sensor, the lower end of the static shaft is connected with the torque sensor, and the upper end of the rotating shaft is connected with the output shaft of the motor. The device disclosed by the invention has the advantages that: the magnetorheological fluid cavity is arranged outside the magnetic isolation disc, thus the edge gathering effect of the magnetorheological fluid to be tested is reduced, and the consumption of the magnetorheological fluid is reduced; and the magnetorheological fluid cavity is arranged at the middle part of the exciting coil, thus a magnetic field at the magnetorheological fluid to be tested is strongest, the verticality and uniformity of the magnetic field are good, and the heat productivity is low.

The invention relates to multi-serial port data communication card equipment based on a CPCI bus and a method thereof. The equipment comprises a CPCI bus communication module, at least two UART communication management modules with automatic RS485 communication flow control functions, a magnetic isolation module, and two-in-one RS232/RS485 communication transceiver modules which have the same number as that of the UART communication management modules. The method comprises the steps of equipment initialization processing operation, data sending processing and data receiving processing. The multi-serial port data communication card equipment based on a CPCI bus and the method thereof helps operate a system more reliable, lays a foundation for high availability, simplifies a RS232/RS485 switching circuit and actually realizes intelligent RS232/RS485 switching control; power consumption of the multi-serial port communication equipment using the magnetic isolation module is only 1/10-1/50 of that of the multi-serial port communication equipment using a photoelectric coupler; the multi-serial port data communication card equipment has higher data transmission rate, time sequence precision and transient common mode inhibition capacity; and the serial communication data transmission rate can reach 230,400bps, thus the equipment is safe and reliable, and has relatively wide application scope.

A composite amorphous alloy axial flux motor is provided. A plurality of inner tooth portions and an outer tooth portion of the stator are uniformly distributed on the stator yoke portion in the circumferential direction, the stator core is embedded in the housing, A DC excitation win is wound around that outer tooth portion, each outer tooth portion and the inner tooth portion inside of the outertooth portion are integrally wound with an armature winding, The rotor is mounted on a rotating shaft, A permanent magnet and a first soft pole are circumferentially uniformly mounted on a side of the rotor yoke close to the stator, A permanent magnet is in contact with the first soft pole, The permanent magnet and the first soft magnetic pole correspond to the circumferential position of the inner tooth part, the second soft magnetic pole corresponds to the circumferential position of the outer tooth part, the second soft magnetic pole is separated from the permanent magnet in the circumferential direction by a magnetic isolation region, end caps are respectively provided at both ends of the housing, and the rotating shaft of the motor is supported at the center of the end caps by bearings. The permanent magnet and the first soft magnetic pole correspond to the circumferential position of the inner tooth part. The invention not only inherits the characteristics of high power density,high torque density and high efficiency of the axial flux permanent magnet motor, but also has the advantages of smooth and adjustable air gap magnetic field of the electric excitation motor and thelike.

A rotor and a rotary electric machine containing the rotor are provided. The rotor includes a shaft, a rotor core coaxially connected to the shaft, a first axial magnetic steel and a second axial magnetic steel disposed at an end surface of the rotor core, a rotor bushing, and a first magnetic isolation groove. The first axial magnetic steel has a first magnetic pole facing the rotor core. The second axial magnetic steel has a second magnetic pole facing the rotor core. The rotor bushing is disposed at a side of the first and second axial magnetic steels opposite to the rotor core. The first magnetic isolation groove is formed in the rotor core along a radius direction of the rotor core. The first magnetic isolation groove is disposed between the first axial magnetic steel and the second axial magnetic steel to isolate the first pole and the second pole.

The invention discloses a water-cooled magnetorheological soft start device, and belongs to the technical field of mechanical power transmission. The device comprises a drive rotator structure and a driven rotator structure, wherein a plurality of drive cylinders and driven cylinders are respectively plugged on drive cylinder sleeves and driven cylinder sleeves at intervals; the drive cylinder sleeves and the driven cylinder sleeves are respectively connected with left magnet-conducting shaft sleeves, right left magnet-conducting shaft sleeves, drive shafts and driven shafts through bolts; a sealing measure is arranged at each connection position; left magnetic yokes and right magnetic yokes are fixed with a magnet-conducting shell; magnet exciting coils and magnetic isolation discs are arranged in the left magnetic yokes and the left magnetic yokes; left bearing seats and right bearing seats are respectively fixed on outer sides of the left magnetic yokes and the left magnetic yokes;left bearings and right bearings used for bearing the drive shafts and the driven shafts are respectively arranged in the left bearing seats and the right bearing seats; a water inlet, a water outlet, a groove, a liquid injecting opening and a liquid discharging opening are formed in the magnet-conducting shell; a liquid injecting plug screw and a liquid discharging plug screw are arranged on theliquid injecting opening and the liquid discharging opening; and a plurality of groups of rotating sealing rings are arranged in the groove. The water-cooled magnetorheological soft start device has the advantages of compact structure, large transmission torque, high radiating performance, high slip frequency power and wide slip frequency range.

The invention discloses a permanent magnet coupling speed regulator. The speed regulator comprises a cylindrical conductor rotor, a cylindrical magnetic isolation housing, a cylindrical permanent magnet rotor and a regulator, wherein the cylindrical magnetic isolation housing is positioned between the cylindrical conductor rotor and the cylindrical permanent magnet rotor; gaps are reserved between the cylindrical magnetic isolation housing and the cylindrical conductor rotor and between the cylindrical magnetic isolation housing and the cylindrical permanent magnet rotor; the cylindrical conductor rotor and the cylindrical permanent magnet rotor independently rotate around rotation axes of the cylindrical conductor rotor and the cylindrical permanent magnet rotor respectively and the axial positions are not changed; and under the action of the regulator, the cylindrical magnetic isolation housing slides along the axial direction, so that the area of an acting magnetic field between the cylindrical permanent magnet rotor and the cylindrical conductor rotor is changed; therefore, load torque and rotation speed are changed.

The invention relates to the field of magnetic isolation material, and discloses a magnetic isolation material and a preparation method and application thereof. The magnetic isolation material comprises a magnetic layer and protective films and an off-type films arranged on different sides of the magnetic layer, wherein the magnetic layer comprises at least one magnetic material sheet layer. The magnetic material sheet layer comprises a plurality of magnetic material chips and the gap between the magnetic material chips are at least partially filled with air; a first glue layer is arranged between the protective film and the magnetic layer and a second glue layer is arranged between the off-type film and the magnetic layer. The preparation method overcomes the problems of complex preparation process of the magnetic isolation material in the prior art, and the prepared magnetic isolation material is with better performance.