481 results about "Magnetic field coupling" patented technology

A method and apparatus for determining the position and orientation of a remote object relative to a reference coordinate frame includes a plurality of field-generating elements for generating electromagnetic fields, a drive for applying, to the generating elements, signals that generate a plurality of electromagnetic fields that are distinguishable from one another, a remote sensor having one or more field-sensing elements for sensing the fields generated and a processor for processing the outputs of the sensing element(s) into remote object position and orientation relative to the generating element reference coordinate frame. The position and orientation solution is based on the exact formulation of the magnetic field coupling as opposed to approximations used elsewhere. The system can be used for locating the end of a catheter or endoscope, digitizing objects for computer databases, virtual reality and motion tracking. The methods presented here can also be applied to other magnetic tracking technologies as a final "polishing" stage to improve the accuracy of their P&O solution.

The invention discloses a dynamic wireless charging apparatus and a parameter acquiring method thereof. The dynamic wireless charging apparatus comprises an energy emitting module and an energy receiving module. The energy emitting module comprises a high-frequency inversion unit, an LC filter unit, a first compensation unit, and a power emitting coil which are successively connected. The high-frequency inversion unit converts DC power into high-frequency AC power. After the high-frequency AC power is adjusted by the LC filter unit and the first compensation unit, energy is emitted in a high-frequency magnetic field coupling mode. The energy receiving module comprises a power receiving coil, a second compensation unit, and an uncontrolled rectification unit which are successively connected, and converts received high-frequency AC power into DC power supplied to a load. The dynamic wireless charging apparatus may automatically adjust the current of a primary-side power coil according to the mutual inductance coupling degree of the power coil so as to obtain a characteristic maintaining stable output power, is suitable for dynamic wireless charging application occasions with a wide bias, and has high transmission efficiency and a soft switch characteristic. In addition, compensation topology provides a primary side inversion power supply with a zero-load current-limiting protection function.

A wireless communications headset system for double hearing protection systems that eliminates the problems associated with typical wireless communications systems. The system employs a magnetic-field coupled wireless link from a loop transmitter to a magnetic field receiver. Current through the transmitter wire loops generates magnetic flux which passes through a communications earplug. The earplug has a receiver for converting the magnetic flux to electrical voltage, and this voltage is used to drive a speaker within the earplug. The transmitter can be easily installed into aviation headsets. The loop transmitter has an open center sized so that it fits around the pinna of the human ear enabling a close position to the communications earplug. This close position is advantageous if an efficient system is desired.

A microwave assisted magnetic recording system includes a write pole that generates a write magnetic field, an element that generates a radio frequency assist magnetic field, and a recording medium that moves relative to the write pole. The recording medium is exposed to the radio frequency assist magnetic field before it is exposed to the write magnetic field. One possible element that generates the radio frequency assist magnetic field is an assist wire placed perpendicular to the write pole. Alternatively, the assist wire can be placed parallel to the write pole so that its radio frequency assist magnetic field couples with the write pole, which in turn generates its own coupled radio frequency magnetic field along with the write magnetic field.

A resonant circuit tuning system and a method for tuning are provided. The resonant circuit tuning system may include an LCR circuit and a reactive element magnetically coupled to the LCR circuit.

Disclosed is a structure for raising the Q-value of a near-field antenna used by a non-contact power transmission device that utilizes magnetic field coupling in the near field in a manner improving the efficiency of power transmission. The near-field antenna used by the non-contact power transmission device galvanically isolates a resonant circuit including a resonant first inductor 31 and a first capacitor 32 from a transmission circuit or a reception circuit and, through electromagnetic coupling or inductive coupling established between the transmission or reception circuit and the near-field antenna using a second inductor 33 or a second capacitor 34, maintains a high Q even if the coupling between the antennas weakens due to an extended distance the antennas.

The invention relates to a permanent-magnet speed regulation, braking or loading apparatus with an adjustable coupled flux. The apparatus is characterized in that a driving plate is a permanent-magnet coupling plate and a driven plate or braking plate is a flux switch type permanent-magnet plate; or the flux switch type permanent-magnet plate is used as a driving plate and the permanent-magnet coupling plate is used as driven plate/braking plate. The permanent-magnet coupling plate and the flux switch type permanent-magnet plate are in an air gap and magnetic field coupling structure mode; the installing sequences of the permanent-magnet coupling plate and the flux switch type permanent-magnet plate can be interchanged; and both the permanent-magnet coupling plate and the flux switch type permanent-magnet plate can serve as the driving plate and driven plate respectively and the internal and external nesting positions of the two plates also can be interchanged. The provided apparatus can be applied to technical fields like coupling transmission and load speed regulation, an automatic transmission unit, braking, rotary loading, power cutting off/combination, electromotor energy saving, household appliances, a sealed pump, petrochemical engineering, and wind power generation and the like; and the technical scheme employed by the apparatus can be used for designing and manufacturing a permanent-magnet speed controller, a speed-regulation coupler, an automatic transmission unit, a brake device, a loading/unloading device, a centrifugal load speed regulator or clutch, or a novel energy-saving household appliance.

The invention provides a system for achieving dynamic wireless constant power charging and a control method for the system. The system comprises an energy transmitting module, an energy receiving module and a constant power tracking control module, wherein the energy transmitting module is used for converting a primary direct current power supply into high-frequency alternating current electrical energy and transmitting the high-frequency alternating current electrical energy in a high-frequency magnetic field coupling manner; the energy receiving module is used for receiving electrical energy and supplying the electrical energy to a load; the constant power tracking control module is used for obtaining a reference control signal according to charging current collected in real time, and adjusting voltage of a rectifying port into a reference control signal to achieve a constant power tracking control. With direct current output by a DC/DC converter at a secondary side as feedback quantity, direct current voltage of an uncontrollable rectifier terminal is disturbed by a perturbation and observation method-based constant power tracking control method; and a transmission voltage gain from the primary side to the secondary side always works on a voltage gain point corresponding to a transmission power extreme point, so that the condition that the system transmits the electrical energy at constant power is ensured, and the output power is kept stable.

A communication apparatus has a first communication section which makes contactless communication by means of magnetic field coupling and a second communication section which makes contactless communication by means of electric field coupling, and the second communication section generates an electric field which oscillates to a direction approximately parallel with an oscillation direction of a magnetic field on a position where the magnetic field crosses the second communication section.

The invention provides a bipolar wireless charging coil, which comprises a transmitting terminal and a receiving terminal, wherein the transmitting terminal comprises a transmitting terminal magnetic shielding layer, a transmitting terminal magnetic dielectric layer, a transmitting terminal support layer and a transmitting coil layer which are sequentially arranged; the receiving terminal comprises a receiving coil layer, a receiving terminal support layer, a receiving terminal magnetic dielectric layer and a receiving terminal magnetic shielding layer which are sequentially arranged; and the transmitting coil layer and the receiving coil layer are coupled to each other and are symmetrical in structure. The magnetic field coupling degree of the transmitting terminal and the receiving terminal is relatively high during wireless charging; the quality factors of the transmitting terminal and the receiving terminal are relatively low; the power transmission efficiency is improved; the bipolar wireless charging coil is suitable for high-power wireless charging; and meanwhile, magnetic field radiation to surroundings can be reduced by the coil structure, so that the transmission efficiency can be improved.

The invention provides a laser boring method assisted by electric field and magnetic field coupling. The laser boring method comprises the following steps that (1) a workpiece is clamped on a laser boring device assisted by electric field and magnetic field coupling; (2) a control circuit is used for controlling a rotating magnetic field generation unit and an electric field generation unit to generate a rotating magnetic field and a rotating electric field respectively, and the electric field direction is always perpendicular to the magnetic field direction; (3) a laser device is turned on, wherein laser beams generated by the laser device act on the surface of the workpiece through a focusing lens, air is blown to the surface of the workpiece at the same time, and then laser boring is conducted on the workpiece under the combined action of the rotating magnetic field, the rotating electric field, the laser beams and thermo-ionized gas. According to the laser boring method assisted by electric field and magnetic field coupling, based on the movement principle of charged particles in the magnetic field and self-inductance currents generated by the rotating magnetic field in a conductor, the movement of plasma and molten metal which are generated in the laser boring process is controlled, and therefore the purpose of optimizing the laser boring effect is achieved. In addition, the invention further provides the laser boring device assisted by electric field and magnetic field coupling.

A wireless power feeder feeds power from a feeding coil L2 to a receiving coil L3 by wireless using a magnetic field coupling between the feeding coil L2 and the receiving coil L3. The feeding coil L2 is formed so as to be rotated. A power transmission control circuit supplies AC power to the feeding coil L2 to make the feeding coil L2 feed the AC power to the receiving coil L3. The power transmission control circuit rotates the feeding coil L2 to change the opposing area between the feeding coil L2 and the receiving coil L3 as viewed in the axis direction of the feeding coil L2 to thereby adjust the AC power to be supplied from the feeding coil L2 to the receiving coil L3.

The invention relates to a system and method for retraining high-frequency vibration of a low-pressure large-power multi-phase variable frequency motor. Due to the fact that a variable frequency power supply output impulse sequence is optimized, by means of a magnetic field coupling relationship in the motor, electromagnetic exciting force causing the high-frequency vibration is reduced, and the purpose of retraining the high-frequency vibration of the motor is achieved. The method for retraining the high-frequency vibration of the low-pressure large-power multi-phase variable frequency motor can effectively reduce the high-frequency vibration of the motor, reduces noise, and is suitable for the fields of large-power industrial electric transmission, rail transit, ship electric propulsion and the like.

The invention belongs to the field of solid waste treatment and relates to a method for reducing sludge by adopting ultrasound-magnetic field coupling to disrupt sludge. The method comprises the following units: an aerobic biochemical unit is to remove organic pollutants through microbes in a biochemical tank; a sedimentation unit is to separate mud from water in a sedimentation tank; an ultrasound- magnetic field treatment unit is to disrupt rest of sludge by adopting ultrasonic wave and a magnetic filed to cooperate for more than 1 minute, wherein the frequency of the ultrasonic wave is 16-200kHz, the density of sound energy is 0.1-1.0W/mL, and the magnetic field strength is 300-20000Gs; an anaerobic digestion unit is to anaerobically digest the sludge in a digestion tank; and a sludge dehydration unit is to carry out solid-liquid separation by adopting centrifugal dehydration. The method greatly reduces the sludge disruption energy consumption, and the sludge is reduced by more than 80 percent when aerobic digestion is carried out to disrupt the sludge; in anaerobic digestion, the digestion time is reduced by more than 60 percent, the methane yield is increased by more than 35 percent, the sludge is reduced by more than 30 percent. The method has obvious economic benefits, thereby having popularization and application value.

An electrical system incorporating a single structure multiple mode antenna is described. The antenna is preferably constructed having a first inductor coil that is electrically connected in series with a second inductor coil. The antenna is constructed having a plurality of electrical connections positioned along the first and second inductor coils. A plurality of terminals is connected to the electrical connections that facilitate numerous electrical connections and enables the antenna to be selectively tuned to various frequencies and frequency bands.

Disclosed herein is a non-contact charge and communication system including: non-contact charge apparatus configured to include a power transmitting device that transmits power for a charge by magnetic field coupling and a first communication unit that carries out non-contact communication by electric field coupling; and power receiving apparatus configured to include a power receiving device that receives power transmitted from the non-contact charge apparatus based on a magnetic field resonance relationship and a second communication unit capable of non-contact communication with the first communication unit by electric field coupling, and charge a battery by received power. The non-contact charge apparatus includes a first control unit, and the power receiving apparatus includes a storage unit, and a second control unit.

There is provided a frequency controller apparatus for use in a wireless power transmitter apparatus configured to wirelessly transmit an inputted power from a power transmitting antenna that includes a first resonant circuit, toward a power receiving antenna that includes a second resonant circuit and is electromagnetically coupled to the power transmitting antenna at a predetermined transmission frequency. The frequency controller apparatus includes a controller for changing the transmission frequency during a power transfer, and the controller sets a decrease amount when decreasing the transmission frequency, so that the decrease amount is smaller than an increase amount when the transmission frequency is increased.

The exemplary embodiments of the present invention provide a high-speed contactless data coupling that is adaptable to use with mechanical rail car couplers. The exemplary embodiments utilize a primarily magnetic field coupling to communicate either baseband data or RF signals through a pair of signal coupling units that do not need to contact either other, which can be easily housed in two heads attached to each of two mechanical rail car couplers.

Disclosed is a little pole difference magnetic field coupling type magnetism transmission eccentricity gear pair of a novel radial direction magnetic field. The little pole difference magnetic field coupling type magnetism transmission eccentricity gear pair of the novel radial direction magnetic field can be applied widely in the field of industry transmissions of wind power generation, electric automobile, vessel driving and the like. The little pole difference magnetic field coupling type magnetism transmission eccentricity gear pair of the novel radial direction magnetic field is characterized in that a stator with a 2p1 stator permanent magnet 1 are distributed in the inner hole of a machine shell 6. A magnetism transmission gear pairs are formed by planet rotors of 2p2 planet rotor permanent magnet 2 are distributed on the excircle of a planet rotor iron core5. A number difference between the pole number 2p1 and 1p2 is small. The permanent magnets on the two magnetic gear pairs penetrate through an air gap magnetic field coupling of the radial direction eccentricity, and are connected to an eccentricity structure by the little pole difference two magnetic gear pairs. A second bearing 12 and a third bearing 13 are installed on an eccentricity input shaft 3. The planet rotor iron core 5 is driven by the eccentricity input shaft 3 to revolve in autogiration around the axis. A low speed autogiration of the planet rotor is output through a pin hole type output structure.

A wireless power transmission system for wirelessly transmitting electric power from a power transmitting device to a power receiving device using magnetic field coupling between a power transmitting coil and a power receiving coil is provided. The power transmitting device includes a power transmitting circuit generating an electric signal for transmitting electric power, first and second power transmitting coils compatible with first and second transmission methods, respectively, a first magnetic substance on which the first power transmitting coil is placed, a second magnetic substance on which the second power transmitting coil is placed, and a power feeding surface on which the power receiving device is to be placed. First and second attachment surfaces of the first and second magnetic substances, respectively, are located on the lower side of the power feeding surface and arranged on a same plane surface parallel to the power feeding surface.

The invention discloses a five-freedom degree magnetic levitation guide rail with novel electromagnet distribution, which comprises a guide rail, a levitation platform, a plurality of electromagnets equipped on the levitation platform and a air gap detection displacement sensor group for detecting motion state on each direction of the levitation platform. A plurality of electromagnets are oppositely arranged on the levitation platform in pair, and excitation of each group of electromagnet pair is set with a differential control mode for providing stable levitation force and guidance force. The plane where the work magnetic circuit of each electromagnet is located is parallel to the operation direction of the levitation platform; the winding current directions of the three electromagnets located at one corner of the levitation platform are identical. The electromagnetic attraction produced by the electromagnet according to the invention can realize five-freedom degree levitation of the levitation platform, thereby solving the magnetic field coupling problem between electromagnets, and the levitation platform has the advantages of contactless, non-lubrication, long stroke, high precision, high speed and adjustable static state rigidity, etc., and the product is suitable for the linear feeding equipment such as high-grade numerical control machine tool and mask aligner or the like which need ultra-clean, high precision and other performances.