271 results about "Magnetic field energy" patented technology

A low arc AC contactor comprises an on/off mechanism electromagnetic-controlled contact, a pulse power source generating circuit, a low arc trigger generating circuit, and a multifunctional fault-detecting circuit. The contactor converts an instantaneous strong current into strong pulse magnetic field energy to actuate contacts of mechanical portion of the contactor, so that the power source load is on or off. Each of the actuating process will be controlled by the electric circuit to perform at the lowest potential of AC voltage for reducing arc's destructive power. Moreover, the contactor uses photoelectric coupling circuits, in which it can be controlled by external low voltage signal commands, as well as providing protection from overload, phase loss, short circuit, and leakage current.

The invention relates to an application field of magnetorheological damping, and provides a control method for magnetorheological damping, which is characterized in that: an input magnetic loop is formed by adopting a giant magnetostrictive material, a permanent magnet and magnetic yokes at both ends; an output magnetic loop is composed of a permanent magnet, a magnetic yoke and a magnetorheological medium. The control method can dispense with coil and exterior power supply, and the conversion from the controlled structure vibration mechanical energy to magnetic field energy can be achieved only by using less materials; thereby the control method for magnetorheological damping has the advantages of non-energy device, large load, great damping force, rapid response, broadband and better buffering to the impact load.

A power regulator including a coil connected to an output of a DC power source for rectifying an AC voltage, a charge-and-discharge capacitor for charging a current supplied from the DC power source through the coil and a backflow preventing diode, a switching device connected to a connection point of the coil and backflow preventing diode in parallel with the DC power source, and a microcomputer for detecting a zero-cross point of the magnetic field energy generated in the coil or the current flowing through the coil, and for bringing the switching device into conduction in response to the detection of the zero-cross point. This makes it possible to solve a problem of a conventional device in that the switching period of the switching device cannot be changed in accordance with variables such as temperature change, errors in circuit constants and the like because switching periods of the switching device are predetermined values.

The invention discloses an automotive hard magnetic brake pad formula and a manufacturing method thereof. The automotive hard magnetic brake pad formula is composed of, by weight, 8-20 parts of an organic binder, 10-45 parts of reinforced fibers, 20-50 parts of a friction performance regulator, 3-10 parts of filling and 5-40 parts of a hard magnetic material. The manufacturing method includes the processes of crushing, mixing, hot-press forming, magnetizing, thermal processing and surface processing. The automotive hard magnetic brake pad formula and the manufacturing method have the advantages that the hard magnetic material is added on the basis of an original automotive brake pad, so that friction coefficient is increased, abrasion ratio is lowered, friction stability is improved, and various complex braking conditions of an automobile are met; the added hard magnetic material is a highly-magnetic substance, so that the automotive hard magnetic brake pad after being magnetized is enabled to have a lot of residual magnetism, and basest material conditions are provided for magnetic field control in the process of braking friction. In addition, the hard magnetic brake pad after being magnetized can maintain magnetism for a long time, so that friction behaviors can be affected and adjusted without externally adding magnetic field energy in the process of braking.

The invention discloses a magnetic concentrator structure for magnetic pulse formation, which relates to a device for forming and connecting a metal pipe by using a pulse magnetic field force. The included angle between the side end face and the axis of a conventional magnetic concentrator structure is between phi/6 and phi/2, so energy transfer efficiency and energy concentration efficiency of the magnetic field are low. The invention provides a novel magnetic concentrator, the longitudinal section structure of which is transverse H-shaped; the value of the oblique angle of the side end face of the magnetic concentrator structure depends on that the structure remarkably improves the magnetic field energy in a magnetic pulse formation discharge process so as to improve the energy conversion efficiency of the magnetic concentrator, further prolong the service lives of a coil and the magnetic concentrator, reduce the discharge voltage and the like.

The invention relates to an on-line energy acquisition device of an automatic transformation winding based on a current transformer (CT). The energy acquisition winding, which winds on the nanocrystal iron core, is utilized to transform magnetic field energy around the alternating current bus into electric energy, and the electric energy is processed by a low voltage drop rectifier circuit (1), a primary filter and voltage sampling circuit I (2), a delay comparison circuit (3), a relay drive control circuit (4), a zero voltage drop voltage regulator circuit (5) and a secondary voltage sampling and filter circuit II (6) to obtain a stable output voltage. The device of the invention can be used for transforming the magnetic field energy around the alternating current bus into the electric energy through the coupling of the magnetic circuit so as to provide stable electric energy for the state monitoring sensor nodes of the power grid line and the electrical equipment. The device of the invention is especially suitable to be used as a power supply for wireless sensor monitoring nodes of current, voltage, temperature and the like for high voltage pylon wires in remote districts, such as mountains, lake and the like.

A magnetic coupling resonance type wireless energy transmission device based on a panel magnetic core belongs to the technical field of magnetic coupling resonance type wireless energy transmission and solves the problem that existing magnetic coupling resonance type wireless energy transmission devices can be only used for low-power energy transmission. The output direct voltage of an energy supply circuit of the device is used as the direct-current busbar voltage Vdc for a coil drive circuit, the coil drive circuit outputs alternating-current square signals and applying the same to a resonance circuit to enable a transmitting coil to generate magnetic field energy, and the resonance circuit consists of an energy transmitting side capacitor bank and the transmitting coil of an energy transmitting subsystem. A magnetic field of the energy transmitting subsystem and a resonance circuit consisting of an energy receiving side capacitor bank and a receiving coil of an energy receiving subsystem are used for magnetic coupling resonance to generate electric energy on the receiving coil of the energy receiving subsystem, and the electric energy is transmitted to an energy conversion circuit which converts input signals of the electric energy into direct-current power voltage signals required by a load. The magnetic coupling resonance type wireless energy transmission device is used for wireless energy transmission.

A method for obtaining high temperature plasma in the Field Reversed Configuration (FRC) magnetic topology is described, allowing for compression, retention and heating plasma, which can be used for obtaining thermonuclear energy or laser pumping. The storage of the magnetic field energy is accomplished by creating a current in the winding of a solenoid over a working volume. In addition, a pulse toroidal magnetic field with force lines perpendicular to the magnetic field of the solenoid is created via the transmission of a current through the working volume. Then, the current is broken off in the solenoid winding when it reaches its maximum to excite a closed current loop in the plasma created in the working volume. The change of the direction of magnetic field outside the current-carrying loop in the plasma is achieved either by changing to the opposite direction of the current in the solenoid or transmitting the current in additional turns parallel to the turns of the solenoid.

The invention discloses a reactor used for biological oxidation of refractory gold sulfide. The reactor comprises an upper end enclosure, a cylinder body, a cooling jacket, Helmholtz coils, a stirrer, a lower end enclosure, a gas distributor, a sieve plate and liquid recirculation pipes, wherein the sieve plate divides the cylinder body into a magnetic stabilization reaction region and a gas saturation region; the gas saturation region is provided with the stirrer with three-bladed propeller, an aeration pipe and the gas distributor; the upper end enclosure and the lower end enclosure are provided with the liquid recirculation pipes arranged outside the cylinder body; each liquid recirculation pipe is provided with a microbial liquid culture medium filler opening, a valve and a fluid pump; and the Helmholtz coils are one-dimensional Helmholtz coils are arranged outside the cooling jacket; and the axial direction magnetic field energy of the Helmholtz coils which can adjust intension has magnetic stabilization effect to mineral particles with magnetic sensitivity in the magnetic stabilization reaction region. The reactor used for biological oxidation of refractory gold sulfide has the advantages of capable of intensifying mass transferring and heat transferring, reducing energy consumption, optimizing microbial growing environment, improving mineral oxidation rate and realizing continuous operation.

The invention belongs to the field of inductor design, and particularly relates to a high-frequency eddy current effect-considered semi-analytical calculation method for winding loss. The method comprises the following steps of: obtaining a complex permeability expression of a single isolated circular conductor in a uniform time-harmonic magnetic field; calculating complex permeability of homogenization of a multi-turn circular conductor coil; metering influences which consider a skin effect through importing an impedance corresponding to the skin effect; establishing a two-dimensional finiteelement model, and calculating magnetic field intensity of a space region so as to obtain magnetic field intensity of a conductor region and an air region; calculating total magnetic field energy eddycurrent loss stored by the conductor region and the air region by combining the magnetic field intensity, obtained via static magnetic field finite element simulation, of the conductor region and theair region; and calculating eddy current loss of a multi-turn conductor region, and summating skin effect eddy current loss and proximity effect loss to obtain total loss of a winding region. The method can be used for determining winding loss of multi-turn conductor coils and effectively decreasing the calculation workload, and is beneficial for engineering application.

The invention provides a ferromagnetic lamination sheet, a magnetic conductive part of a motor, the motor with the magnetic conductive part, a motor winding structure with the magnetic conductive part, a motor with the motor winding structure, a wind generating set, a wind power plant, electric energy and magnetic field energy transformation equipment, and a blade for the wind generating set The magnetic conductive part comprises a winding groove, and the inner wall of the winding groove is provided with a plurality of holes. According to the invention, the magnetic conductive part can effectively keep and fix a liquid insulating medium through the hole structure when the magnetic conductive part is used for insulating processing, and forms a rooted central elastic base at a ferromagnetic boundary after the solidification of the liquid insulating medium, and effectively prevents the insulating medium from being peeled, broken or separated.

The invention provides a double-wire Hall current sensor. The double-wire Hall current sensor comprises a magnetic core, a double-wire cable, a Hall element, an energy acquiring coil and a current sensing circuit, wherein the magnetic core is an open-circuit magnetic core or a closed magnetic core; the double-wire cable is parallel with a central shaft of the magnetic core, so that magnetic induction lines generated by the double-wire cable are gathered inside the magnetic core; the Hall element is perpendicular to the cross section of the magnetic core and is used for acquiring a current signal of the double-wire cable and sending the current signal to the current sensing circuit; the energy acquiring coil is arranged on the surface of the magnetic core and is used for storing magnetic field energy of the double-wire cable; the current sensing circuit receives the current signal and is used for converting the current signal into a digital signal and wirelessly transmitting the digital signal in an electromagnetic wave. Through arrangement of the magnetic core outside the double-wire cable, distribution of an electromagnetic field around the double-wire cable is changed; the current of the double-wire cable is detected by the Hall element; the magnetic field energy of the double-wire cable is acquired by the energy acquiring coil and the current sensing circuit; therefore, the double-wire Hall current sensor achieves self power supply and wireless transmission.

The invention discloses a carrier rocket ground high-power wireless power supply system based on electromagnetic resonance, which comprises a ground power supply converter, a transmitting coil, a receiving coil and an energy receiving processor. The ground power supply converter and the transmitting coil are respectively placed on a ground transmitting platform or an oscillating bar; the receivingcoil and the energy receiving processor are arranged on the rocket; the ground power supply converter converts alternating current into high-frequency alternating current and inputs the high-frequency alternating current into the transmitting coil, the receiving coil converts coupled magnetic field energy into high-frequency alternating current and inputs the high-frequency alternating current into the energy receiving processor, and the energy receiving processor processes the high-frequency alternating current and then outputs power supply voltage meeting rocket load power supply requirements. Non-contact and separation-free power supply of the carrier rocket in the ground test and launch process is achieved, existing unplugging and unplugging technologies can be replaced, automatic butt joint of rocket power supply is achieved, and the defects that unplugging and unplugging cables are complex in operation, high in difficulty, large in personnel and time consumption, high in degreeof dependence on auxiliary equipment and the like are overcome.

The invention relates to a magnetorheological valve, belonging to the technical field of hydraulic transmission. The magnetorheological valve comprises a left valve joint, a left supporting overcurrent plate, a valve body, a coil, a valve core, an iron core, a right supporting overcurrent plate and a right valve joint, wherein the coil is wound on the iron core, the iron core is placed in the valve body, the valve core is placed in the hole of the iron core, and a working clearance is formed between the valve core and the iron core; and two ends of the valve core are respectively fixed by the left supporting overcurrent plate and the right supporting overcurrent plate, the left supporting overcurrent plate and the right supporting overcurrent plate are respectively placed in the left valve joint and the right valve joint, and the left valve joint and the right valve joint are fixed on the valve body. In the magnetorheological valve provided by the invention, adopts a symmetrical structure design is adopted, which facilitates the connection of the two joints. The magnetorheological valve has no motor elements, simple structure, small size and low cost. The valve body, the valve core and the iron core are made of high magnetic-conductive materials for improving the magnetic conductive performance of the valve. The supporting overcurrent plates and the valve joints are made of non magnetic-conductive materials for reducing magnetic flux leakage and improving the utilization rate of magnetic field energy. The magnetorheological valve has wide pressure regulating range, fast response speed and high reliability.

The invention discloses a magnetic stand type hook which is provided with a cast ion housing for hanging an object. The right center of the cast ion housing is provided with a through hole from front to back; an electrician soft ion layer is coaxially embedded on the inner surface of the through hole; tubular brass components are embedded at both the upper and lower parts of the right center of the cast ion housing; the inner end faces of the brass components are parallel and level to the inner surface of the electrician soft ion layer; the front and rear end faces and the upper and lower end faces of the brass components are all parallel and level to the cast ion housing; a rotatable permanent magnet is arranged in an inner cavity of the electrician soft ion layer and at the position of the axle center of the through hole; the front end of the rotatable permanent magnet is fixedly connected with a manual rotating component; the outer lateral surfaces on which an N pole and an S pole of the rotatable permanent magnet are positioned are both matched with the inner surface of the electrician soft ion layer and can slide along the inner surface of the electrician soft ion layer 3; the inner magnet is controlled by the manual rotating component to achieve conversion of two suction and loosening states; the hanging of a heavy weight is implemented by utilizing magnetic field energy; the magnetic stand type hook has no limitation on the cleanness and roughness of an adhesion surface, can be easily disassembled and repeatedly used and can bear a large load.

The invention relates to a mobile power source having wireless charging and discharging functions. The mobile power source comprises a coil unit used for carrying out magnetic field energy exchange with other equipment or components, an energy storage device used for storing energy provided by the coil unit or providing energy for the coil unit, and a charging and discharging control module, wherein one end of the charging and discharging control module is connected with the coil unit, the other end of the charging and discharging control module is respectively connected with a charging circuit and a discharging circuit, and the charging circuit and the discharging circuit are respectively connected with the energy storage device. Energy received by the coil unit can be received and processed by the charging and discharging control during charging, the processed energy is transmitted to the energy storage device through the charging circuit, the energy released by the energy storage device can be processed by the charging and discharging control module during discharging and then is released through the coil unit. Compared with the prior art, the coil unit can realize charging and discharging in a wireless induction mode, and a simple structure and low cost are realized.

The invention relates to a differential contact module, a differential connector and a differential pair shielding structure. The differential pair shielding structure comprises two oppositely-bondedshielding sheets. The opposite sides of two shielding sheets are provided with accommodation slots for accommodating a differential signal pair. The corresponding accommodation slots on two shieldingsheets are buckled and assembled to form an accommodation hole for accommodating the differential signal pair to fully surround and shield the differential signal pair. The differential signal pair isintegrally located in the accommodation hole from a socket end to a plug end, and fully surrounded and shielded by two shielding sheets to ensure that any two adjacent differential pairs are completely isolated by the shielding sheets. An electromagnetic field between two signal conductors is effectively restrained. The leakage of magnetic field energy is reduced. Signal interference is reduced.The structure is relatively simple. At the same time, two shielding sheets are oppositely bonded, which is convenient for assembly and processing.

The invention discloses a device for collecting the magnetic field energy excited by the electric current of a power supply line. The direction of the magnetic field excited by the current in the wire and cable at the location of the transducer is parallel; the size of the transducer along the circumference of the wire and cable is less than 1/4 of the circumference of the cross section of the wire and cable. The invention also discloses a self-powered wireless sensor based on the aforementioned structure, and a power supply line state monitoring system based on the self-powered wireless sensor. The beneficial technical effect of the present invention is: the magnetic field energy excited by the current in the electrical power supply line (including single-wire, double-wire, and three-wire cables) can be collected to obtain electric energy; the collected energy can be used to drive the self-powered wireless sensor to operate and form a power supply line Condition Monitoring System.

The invention provides an electromagnetic ultrasonic detection system based on electromechanical hybrid frequency-modulation energy-gathered irradiation. The system employs a plurality of associate coil pairs of an electromechanical hybrid apparatus to generate an alternative electromagnetic field, the mechanical motion of the apparatus enables a static magnetic field to be converted into an alternative magnetic field, and a regularly-leaked transmitting terminal magnetic field leads to energy gathering at a detection object and forms a wideband frequency-modulation supersonic wave source. The ultrasonic wave oscillates on the surface of the detection object and generates an electromagnetic field after being reflected in the detection object. An magnetic-induction reception array, which is arranged at a position where the intensity of the alternative electromagnetic field generated by the multiple associate coil pairs and the static magnetic field are both weak, is utilized for inducing variation of the induced electromagnetic field, thereby receiving ultrasonic reflection wave signal. The magnetic field generated by permanent magnet does not have the conversion loss from electric energy to magnetic energy, the conversion energy efficiency is high, the magnetic field energy is gathered, the emission efficiency is improved, reception noise is reduced, detection precision is high, and the system and the method are relatively applicable to detection during operation, fixed-point heating auxiliary treatment, noninvasive lossless detection on iron ion in blood, and the like.