265 results about "Degaussing" patented technology

A fixing device including a fixing member to melt a toner image to fix the toner image to a recording medium, a pressing member pressed against the fixing member to form a nip to where the recording medium is conveyed, multiple temperature detectors to detect a temperature at multiple positions on a surface of the pressing member in a width direction thereof, a heating member including a heating layer to heat the fixing member; an exciting coil to generate magnetic fluxes to inductively heat the heating layer, and one or more pairs of degaussing coils to generate magnetic fluxes to degauss the magnetic fluxes generated by the exciting coil. An amount of power supplied to the one or more pairs of degaussing coils is controlled based on a result detected by each of the multiple temperature detectors.

A fixing device includes an induction heater constructed of an exciting coil, a first pair of degaussing coils, and a second pair of degaussing coils. A controller turns off the exciting coil while the controller turns on one of the first pair of degaussing coils and the second pair of degaussing coils and at the same time turns off the other one of the first pair of degaussing coils and the second pair of degaussing coils, and then turns on the exciting coil for an extra time period corresponding to reserved power not supplied to the exciting coil while the exciting coil is turned off.

The invention discloses a shielding longitudinal watertight degaussing cable and a production method thereof for ships. A tinned copper wire is impregnated with a sealant and then twisted into a twisted copper conductor which is impregnated with a conductor sealant layer on the periphery, an electro-insulating rubber layer is extruded on the periphery of the conductor sealant layer to form insulation core wires, chloroprene rubber filling bars are filled into gaps between the insulation core wires, and a plurality of insulation core wires are twisted wholly into a cable core. A cable core inner sealant layer, an inner jacket rubber layer, an armor shielding layer and an outer jacket rubber layer are sequentially arranged on the periphery of the cable core. A single wire of the cable conductor is impregnated with the sealant, the twisted copper conductor is impregnated with the conductor sealant layer on the periphery, the cable core inner sealant layer is extruded on the periphery of the cable core to form multiple sealing, the chloroprene rubber filling bars swell during follow-up vulcanization and can fill in the gaps inside the cable core completely, and tangency between the insulation core wires can be avoided, so that the sealant can permeate to the inside of the cable core to guarantee the watertight effect when the cable core inner sealant layer is extruded.

The invention discloses a reinforced tensile screening type vertical watertight degaussing cable for a ship and a manufacturing method thereof. A twisted copper conductor is formed by soaking a plurality of tinned copper wires in a sealant and then twisting the tinned copper wires; a conductor sealant layer is soaked on the periphery of the twisted copper conductor; insulating rubber layers are extruded on the periphery of the conductor sealant layer; an aramid fiber reinforcing layer is weaved on the periphery of each insulating rubber layer so as to form an insulating core wire; chloroprene rubber filling strips are filled into gaps among the insulating core wires, and a cable core is integrally formed by twisting the insulating core wires; a cable core inner sealant layer is extruded on the periphery of the cable core; and an inner jacket rubber layer is extruded on the periphery of the cable core inner sealant layer. A plurality of seals are arranged on the periphery of a cable conductor, and the chloroprene rubber filling strips expand in a follow-up vulcanization process, thus entirely filling the gaps in the cable core; and one insulating core wire is not tangential to another insulating core wire. Therefore, when the cable core inner sealant layer is extruded, the sealant can permeate inside the cable core, so that the watertight effect can be ensured.

Disclosed is an apparatus for destroying electronic memory media by use of a bi-directional degaussing device. The degaussing device utilizes an SCR gate controller to cause bi-directional polarity from a charged capacitor into a sealed chamber containing the magnetic media. The chamber has a movable steel plate cover and floor that encloses the chamber containing magnetic media during the degaussing stage. The cover and floor cause a reflective chamber that focuses and directs the flux level to the magnetic media. The gate controller allows the use of the same capacitor bank to power a coil in two different directions to obtain effective degaussing without multiple coils or directional capacitors.

High-current, compact, flexible conductors containing high temperature superconducting (HTS) tapes and methods for making the same are described. The HTS tapes are arranged into a stack, a plurality of stacks are arranged to form a superstructure, and the superstructure is twisted about the cable axis to obtain a HTS cable. The HTS cables of the invention can be utilized in numerous applications such as cables employed to generate magnetic fields for degaussing and high current electric power transmission or distribution applications.

The invention discloses a surface contact magneto-rheological flat polishing device and method with a uniform magnetic field. The surface contact magneto-rheological flat polishing device with the uniform magnetic field comprises a polishing head, a polishing groove fixed onto a main shaft and a magnetic pole arranged under the polishing groove. The magnetic pole maintains a certain gap from the outer surface of the bottom of the polishing groove; the polishing head comprises a workpiece shaft and a non-magnetic-conducted clamp fixed to the lower end of the workpiece shaft, and a soft magnetic plate is arranged between the non-magnetic-conducted clamp and the workpiece shaft; the polishing head is arranged above the polishing groove; the uniform magnetic field is formed between the magnetic pole and the soft magnetic plate; and the polishing groove is filled with magneto-rheological fluid. The surface contact magneto-rheological flat polishing device and method with the uniform magnetic field can achieve the large-area uniform polishing of a super-smooth large-size flat element and improve the polishing efficiency effectively; reduces the complexity of the motion mode of a workpiece to simplify the device structure; enables the magnetic field to be not easy to attenuate and obtains the uniform magnetic field with a magnetic pole gap of 30 mm; and can achieve demagnetization easily.

The invention provides a dual-winding single-stage primary feedback LED (Light Emitting Diode) lamp drive circuit. An LED drive chip of a source drive technology is adopted, and degaussing time Tons (namely secondary side turn-on time) is indirectly detected through parasitic capacitors at source and drain of an external first power transistor; an extremely high power factor is also realized through a control method of fixed primary side turn-on time Tonp to relieve power grid pressure; open-circuit protection of an output LED is realized through a correlation technique of the primary side turn-on time and a primary side current peak value; besides, since the LED drive chip has extremely low working current, power can be directly supplied by line voltage through a first resistor; thus auxiliary winding required for detecting the power supply and degaussing time and output voltage of the LED drive chip of the existing primary side feedback LED drive circuit is omitted; the transformer is only provided with a primary side winding and a secondary side winding, so the manufacturing process flow of the transformer is simplified, and the cost is further reduced.

The invention discloses a self-service borrowing bookshelf of a library and a self-service borrowing method of the bookshelf. The bookshelf comprises a bookshelf body with layer grids and a man-machine interaction system; the man-machine interaction system comprises an information processing module, a storage module, an information reading module, a reader command input module, a display module and a network communication module; the information processing module is connected with other modules through signals, connected with a database of the library in a communication mode through the network communication module, and used for controlling the self-service borrowing process and storage and interaction of corresponding information; the man-machine interaction system further comprises a book degaussing and magnetizing module which is used for degaussing and magnetizing books. The method comprises the steps of a self-service book borrowing and returning process and a self-service query process which are completed by a reader by using the bookshelf. The self-service borrowing bookshelf of the library is convenient and efficient, a large amount of capital investment is not needed, the borrowing efficiency is greatly improved, the borrowing cost is saved, the personnel cost is lowered, and the self-service borrowing bookshelf of the library can be widely applied to various small and medium-sized libraries, in particular to most university libraries.

The present invention relates to a method and apparatus for destroying, on site, electronic and electric equipment and media and the information contained thereon. More specifically, the present invention relates to an apparatus and method for removing information stored on electronic and electric equipment and media by degaussing and shredding the physical hardware containing the information. Each of the degausser and the shredder are contained within a mobile vehicle such that the scrap electronic and electric equipment and media may be destroyed and stored within targeted receptacles. Moreover, the mobile vehicle of the present invention is adapted to move from one location to another such that the method of destroying the electronic and electric equipment and media may be utilized on-site at the facility of a business owner, thereby, eliminating any risk associated with compromising the confidentiality of the information.

The invention provides a quasi-resonant device for switching power supplies. The quasi-resonant device comprises a sampling module used for sampling a transformer secondary degaussing time Tds according to a feedback signal Vsen of voltage output of a switching power supply after a switching tube of a quasi-resonant module in the switching power supply is closed, a valley bottom sampling module used for sampling a resonant valley bottom signal of the quasi-resonant module according to the Vsen, a fixed-proportion time generation module connected with the sampling module and used for generating time T at a preset proportion through Tds processing, and a logic processing module respectively connected with the valley bottom sampling module and fixed-proportion time generation module and used for acquiring the first valley bottom signal after the time T and using the first valley bottom signal as a switching signal to open the switching tube. According to the device, the efficiency can be increased, electromagnetic interference can be improved, the cost can be reduced, and switching loss and noise can be avoided. The invention further provides a quasi-resonant system for switching power supplies and a quasi-resonant control method for switching power supplies.

The invention relates to a generalized force magnet, which forms the magnetic flux change of using the rise and drop change of the voltage or the current pulse in the coil, thus has the induced electromotive force, the induced current and the reverse induction field in the conductor. Through regulating the time ratio, pulse waveform and so on of impulse in the electric current rise and drop to realize the repelling force, the attraction or the vibration power which is exerted on all conductors, and enables this magnet to maintain separates or mutual attraction relatively static or back and forth vibrates with each kind of conductor. One kind magnetic suspension vehicles or the train which used the above magnet, provides the separation aerosol magnet, the guidance magnet, the actuation magnet, the brake / back-draft magnet in the bogie or the frame of the locomotive and lower part vehicles (and essential degaussing magnet); the kind of vehicles no need to rebuild the existing railroad to realize high speed or / heavy load travel on the conductor track specially on the existing railroad.

The invention discloses a degaussing coil device for a ferrite-permalloy composite magnetic shielding barrel, and is a degaussing coil structure of a low noise magnetic shielding barrel, which is especially suitable for an ultra-high sensitive atom magnetometer, an atom gyroscope and other quantum precision measurement fields. For a composite magnetic shield barrel formed by magnetic shielding barrels of two different magnetic materials, shielding layers of two different materials are separately subjected to degaussing coil arrangement, and then degaussing wires are connected in series together. The ferrite is located in a permalloy magnetic shielding layer for synchronous degaussing instead of a frequently used solenoid type degaussing coil or annular wound degaussing coil. The inner layer ferrite shielding layer with low permeability which is not easy to demagnetize is subjected to combined wiring of the circumferential and axial directions, which enhances the demagnetizing effect ofthe inner ferrite shielding layer and solves the problem that the ferrite shielding barrel is not easy to demagnetize. The coil structure provides a better demagnetization effect, reduces the residual magnetism after demagnetization of the composite magnetic shielding barrel, and reduces the magnetic field gradient caused by the residual magnetism inside the magnetic shielding barrel.

The invention discloses a derating control method for a permanent magnet synchronous motor. The method includes the first step of recording the instantaneous peak current of the permanent magnet synchronous motor from a normal working mode to an invalid response mode under the conditions of different rotation speeds and constant maximum torque, the second step of recording degaussing rates at different rotor temperatures according to the instantaneous peak current at each rotation speed, the third step of obtaining the maximum allowable rotor temperature at each rotation speed according to the maximum allowable degaussing rate, the fourth step of setting derating coefficients for each rotation speed and each rotor temperature, and the fifth step of limiting the maximum output torque and the maximum output power according to the derating coefficients set at the fourth step and the current rotation speed and rotor temperature. The derating control method is especially suitable for the permanent magnet synchronous motors on new energy automobiles, can ensure that the residual magnetic flux density of permanent magnets does not exceed a certain scope and can meet the requirements for climbing at low speed and overtaking at high speed.

The invention discloses a strengthening tensile type longitudinal watertight degaussing cable for ships and warships and a manufacturing method of the strengthening tensile type longitudinal watertight degaussing cable, and belongs to the field of cables. A plurality of tinning copper wires are steeped with a sealant and is stranded to be a stranded copper conductor; a conductor sealant layer is steeped on the periphery of the stranded copper conductor; an insulated rubber layer is extruded at the periphery of the conductor sealant layer to form insulated core wires; a chloroprene rubber filling strip is filled in a gap among each insulated core wire and the plurality of insulated core wires are integrally stranded to form a cable core; a cable core sealant layer is extruded at the periphery of the cable core; and a sheath rubber layer is extruded at the periphery of the cable core sealant layer. A monofilament of the cable conductor is steeped with the sealant, the conductor sealant layer is steeped at the periphery of the stranded copper conductor, and a cable core sealant layer is extruded at the periphery of the cable core so as to form multiple sealing; and moreover, the chloroprene rubber filling strip is expanded during subsequent vulcanization and can be totally filled in the gap of the cable core, so that the insulated core wires are not tangential to each other, and the sealant can be infiltrated into the cable core to ensure the watertight effect.

A degaussing apparatus having permanent magnets employing common center poles arranged to obtain a flux level gauss of twice the normal level by arranging permanent magnets to create an enhanced center pole effect having an increased flux path as compared to the use of complimentary permanent magnets. The magnets are rotatably mounted in a nonferrous housing allowing placement of magnetic materials, such as a hard drive, thereon. The magnets are rotated within the housing by use of an electric drive motor. The magnets are maintained a predetermined distance from the magnetic materials to be degaussed by use of a spacer, preferably a series of rollers. In operation, the magnetic material is placed upon the housing and upon operation of the electric drive motor, the magnets are rotated in a 360° pattern causing degaussing of the magnetic material and complete destruction of hard drive heads and coils.

The invention discloses a longitudinal water-sealing degaussing cable. The longitudinal water-sealing degaussing cable is characterized by comprising three cores which are arranged in a delta shape or linearly. A plurality of tin plated copper wires are twisted to form a conductor in the center of each core of the cable by an electric wire and cable twisting machine. A waterproof adhesive is filled in gaps between every two of the plurality of tin plated copper wires. A first layer of wrapped waterproof tape is arranged on the periphery of the conductor. An insulating layer made of an insulating material ethylene propylene rubber is arranged on the periphery of the first layer of wrapped waterproof tape. A second layer of wrapped waterproof tape is arranged on the periphery of the insulating layer. A sheath is arranged on the periphery of the second layer of wrapped waterproof tape. The waterproof adhesive is filled in gaps between every two of the three cores which are arranged in the delta shape. The longitudinal water-sealing degaussing cable has the advantages that: by a multi-core structure, troubles in the multi-turn winding laying of the conventional single-core structure are avoided, and the longitudinal water-sealing degaussing cable is convenient to mount and lay; the longitudinal water-sealing degaussing cable can be used for compensating for own induced magnetic field of a naval ship, and is small in interference and good in degaussing effect, and a generated magnetic field is regular and easy to control; and the longitudinal water-sealing degaussing cable is low-smoke, halogen-free and low-toxicity.

The invention discloses a pipeline port hysteresis buffer demagnetization method and a demagnetizer and relates to the technical field of pipeline systems. Demagnetization coils are wound at a port of a pipeline to be demagnetized; a giant magneto-resistance probe is fixed at an outer edge of the port of the pipeline; the giant magneto-resistance probe is connected with a data interface of a maincontroller of the demagnetizer; and the demagnetization coils are connected with a power output end of the main controller. The method comprises the following steps that: the main controller picks upa signal of the giant magneto-resistance probe and measures the size and direction of the remanence of the pipeline; according to the size and direction of the remanence of the pipeline and differences of materials, the main controller automatically calculates output parameters and controls a circuit part to convert a power frequency alternating current of 50 Hz into a high frequency alternating current of 20 to 45 kHz; and the main controller performs voltage reduction and rectification and controls a power supply to generate the size and direction of a required current so as to obtain a magnetic field of which the size is equal to that of the remanence of the pipeline and the direction is opposite to that of the remanence of the pipeline. Compared with the conventional demagnetization product, the demagnetizer has the advantages of light weight, low energy consumption, advanced control mode, reliability in operation, high demagnetization speed, good demagnetization effect and the like.

A method for in-situ magnetization of a generator rotor is provided. The generator has a stator and the rotor is located inside the stator. An air gap is formed between an outer radial portion of the rotor and an inner radial portion of the stator. The rotor has a plurality of excitation windings and a plurality of permanent magnets. The method includes the step of applying a current to the excitation windings, and the current is greater than a normal excitation current. A maintaining step maintains the current for a time period sufficient to magnetize the permanent magnets. The magnetization of the permanent magnets occurs on the rotor in-situ and while the rotor is inside the stator.

The present invention discloses a topology structure of a various magnetic flux-strong magnetic type permanent magnet synchronous motor. The motor is an air gap linkage on-line adjustable radial magnetic flux motor, comprises a rotor and a stator iron core which are coaxially arranged from inside to outside, wherein the rotor employs low-coercive force permanent magnetism materials to realize online adjusting of the magnetic steel linkage and avoid that the magnetic steel is demagnetized at the normal work; the rotor armature current needs to include increased magnetic component, and a rotor quadrature-axis magnetic circuit is provided with a plurality of flux barriers to allow the direct-axis inductance to be larger than the quadrature-axis inductance in order to obtain a positive reluctance torque; the rotor employs a structure being the same as a traditional permanent magnet synchronous motor, and when the motor needs speed regulation, the vector control method is configured to lead in direct-axis pulse current in the armature winding for magnetizing and degaussing of the magnetic steel so as to realize online adjusting of the air-gap linkage.

Embodiments in accordance with the present invention provide a degaussing device and a degaussing method capable of efficiently degaussing a magnetic disk, especially, a magnetic disk of the perpendicular magnetic recording system, without resorting to a magnetic field of a high intensity. Embodiments in accordance with the present invention provide a degaussing method of degaussing a magnetic disk not yet installed in a magnetic disk drive by applying an external magnetic field to the magnetic disk by a degaussing device. In accordance with one embodiment, the method includes disposing the magnetic disk in the degaussing device such that the direction of an external magnetic field is inclined at an angle to the axis of easy magnetization of the magnetic disk.

A bulk degaussing system for the erasure of magnetic storage media by means of permanent magnets. The bulk degaussing system includes a rotatably mounted carousel and an angular displacement means that angularly displaces the carousel through a predetermined angle after passage of the carousel through a degaussing gap.

Embodiments of the invention prevent demagnetization or degaussing of recorded magnetizations, even if a stray field is applied. In one embodiment, an output of a read head including a magneto-resistive effect element is inputted to a stray field detector through a DC amplifier and a DC filter. The stray field detector monitors dc components of the output from the read head, and escapes a head from above a magnetic recording medium.

The invention provides a consumable container, an information processing system and an information processing method. The consumable container comprises a shell and a cavity surrounded by the shell, wherein the outer wall of the shell is provided with a record strip comprising a plurality of magnetic bodies. The information processing system comprises a demagnetization device, a demagnetization controller for controlling the work of the demagnetization device, a plurality of magnetic bodies of which magnetism can be removed by the demagnetization device, and a magnetic field sensing apparatus. The information processing method comprises that: the magnetic field sensing apparatus detects the amount of the magnetic bodies with the magnetism on the record strip and transmits the detection result to a body controller; the body controller judges whether the consumable excess is enough in the consumable container, and if the consumable excess is enough, printing work begins, otherwise, warning information is sent out; and after the printing work begins, the body controller judges whether the magnetism of one magnetic body needs to be removed, and if the magnetism needs to be removed, the demagnetization device removes the magnetism of the magnetic body, otherwise, the judgment is continuous. The invention can effectively avoid occurrence of abnormal work situation because the related information of the consumable container cannot be read.

There is disclosed a method and system for demagnetizing an object. The method includes the step of applying a substantially uniform electromagnetic field to a magnetized object under condition to substantially demagnetize said object.

A write head degaussing circuit and methodology configured to end the degaussing signal a selectable percentage short of the tapered degaussing waveform, starting the degaussing of the write head current Iw at a percentage less than Iw, removing any overshoot of the degaussing signal, and any combination of the above.

The invention discloses a self-service settlement system for an unattended convenience store, and belongs to the field of unattended convenience stores. The system comprises a label unit, a degaussingunit, a separating unit and a collecting and identifying unit, wherein the label unit is used for degaussing of a magnet, and the degaussing unit is used for degaussing of the magnet to separate an electronic label from a commodity. The separating unit is used for further separating the electronic label from the commodity, and the settlement unit is used for the settlement of the commodity. The commodity and the electronic label are set correspondingly in the unattended convenience store, and are separated during settlement. The separated electronic labels are collectively identified, therebyachieving the convenient, quick and accurate settlement of the commodities purchased by customers in the unattended convenience store.

The invention discloses a full-sealed water, fire and explosion prevention cable joint safety box, comprising a shell made of a weak magnetic iron plate synthesis material. The shell is a cylinder molded from two semi cylindrical shells integrally once without welding, the two semi cylindrical shells of the shell are connected through a stock set screw at the explosion-proof inner hexagonal concave end, the diameters of both ends of the shell are reduced to form contraction openings, a section of cylinder with a small size is formed at each contraction opening, a waterproof sealing accessory made of a high-quality silicone rubber material is installed in each contraction opening, a fireproof flame-retardant insulating layer is adhered to the inner wall of the shell, and an anticorrosion and anti-ultraviolet powder is sprayed on the outer surface of the shell. The invention has the advantages that the shell is molded integrally without welding, is integrally treated by hot galvanizing and degaussing, is integrally sprayed with the anticorrosion and anti-ultraviolet material, and has the advantages of strong explosion-proof force, strong corrosion resistance and long aging resistance time. The traditional shell has common tensility and poorer explosion-proof force and is smelted to be in a carbonization state or seriously deforms for burning for a long time, and the fireproof flame-retardant insulating layer can fulfill the functions of fire prevention, flame retardancy and heat insulation.

The invention provides a quick demagnetization method based on magnetic medium characteristics. Recognition module by magnetic medium, basic information such as brands, types, capacities and production time of to-be-demagnetized magnetic media is acquired by adopting multi-source sensing cooperation modes such as bar code scanning and image collection, magnetic medium recognition is realized by means of a data processing technology and a magnetic medium recognition algorithm, and then characteristic information such as a magnetic recording mode, material characteristics and coercive force of the to-be-demagnetized magnetic media is extracted; through a demagnetization parameter optimization setting module, obtaining optimization setting values of demagnetization parameters such as the magnetic field intensity and the demagnetization angle of the to-be-demagnetized magnetic medium based on the demagnetization optimization setting model; a degaussing parameter set value is tracked through a degaussing magnetic field closed-loop control module in combination with domain expert knowledge by adopting a closed-loop control mechanism integrating a magnetic field control algorithm, a charging and discharging device, a magnetic field generation device, a magnetic field and an environmental characteristic measurement sensor, and quick degaussing of a magnetic medium to be degaussed is completed.