948 results about "Em induction" patented technology

The invention relates to an assembly comprising a power transmitter (E) and a power receiver (R) respectively comprising a primary coil (11) and a secondary coil (22), in which the transmitter and the receiver are of the electromagnetic induction type and allow on the one hand the powering without electrical contact of the receiver by the transmitter, and on the other hand a bidirectional communication without electrical contact between the transmitter and the receiver.

The present inventions relates a wireless charging coil structure in electronic devices, comprising a PS coil module capable of emitting electromagnetic wave energy and a PR coil module capable of receiving power energy by electromagnetic induction. Each of the PS and PR coil modules includes a bar-shaped magnetic conductor, on which an insulated wire is wound into a first coil that is extended along the magnetic conductor to a given length and wound reversely into a second coil, thus producing an induction coil comprising at least the first and second coils. The induction range with given space formed between the first and second coils is used for electromagnetic induction to transmit signals and power energy. Such structure can be applied not only in planar handheld electronic devices, but also in other wireless power transmission systems that require narrow induction surface for power transmission.

A method and a micro power generator for generating electrical power from low frequency, vibrational energy includes a frequency up-conversion process. The generator is preferably an electromagnetic, vibration-to-electrical power generator which can efficiently scavenge energy from low frequency external vibrations. The generator up-converts low frequency environmental vibrations to a much higher frequency through a mechanical frequency up-converter, and hence provides efficient energy conversion even at low frequencies. This mechanical frequency up-conversion process can be realized in a number of ways. A magnetic method is described as an example. After frequency up-conversion, voltage is induced on coils mounted on resonators by electromagnetic induction. Due to the movement of the coils on their respective resonating cantilevers with respect to the magnet, voltage is generated on the coils and energy conversion is realized.

The invention relates to the micro-energy field, in particular to a vibratory drive composite micro-power source based on the piezoelectric effect and the electromagnetic induction. The micro-power source adapts the requirement of the micro electro mechanical system development for the micro-energy and comprises a substrate, a peripheral base, cantilevers and a mass block, wherein the substrate is fixed with the lower surface of the peripheral base by bonding; a vertical through hole is arranged in the middle of the mass block; an induction coil is processed on the upper surface and/or the lower surface of the mass block; a micro permanent columnar magnet is fixed on the upper surface of the substrate; PZT piezoelectric thin films are arranged on the cantilevers; a plurality of external lead bonding pads are arranged on the peripheral base; and the two ends of the induction coils and the two polarized surfaces of the PZT piezoelectric thin films are respectively connected with the corresponding external lead bonding pads by leads. The power source has reasonable and concise structure, is liable to miniaturization and integration, and can provide power to the micro electro mechanical systems at high output energy density and high output efficiency, realize self power supply of the micro electro mechanical systems and meet the requirement of the micro electro mechanical system development for the micro-energy.

The present invention relates to a novel method and device for electromagnetic stimulation of the skin for the purpose of modifying a physiological condition or performing treatment of a given pathology, and also to an electronic device enabling said method to be implemented. The device is characterized in that it comprises electronic elements imparting oscillatory behavior thereto at at least one resonant frequency, said resonance being induced by electromagnetic induction external to the device. A particular embodiment of the device is a passive electronic circuit that does not include any source of energy, characterized in that it comprises in series a self-inductor (1), a capacitor (2), and a resistor (3).

The invention relates to a piezoelectric-electromagnetic composite low-frequency broadband energy harvester, and belongs to the technical field of new energy and power generation. The piezoelectric-electromagnetic composite low-frequency broadband energy harvester is characterized in that piezoelectric bimorphs are fixed at the upper surface and the lower surface of a cantilever beam; the surfaces of the piezoelectric bimorphs are coated with silver; one end of the cantilever beam is fixed on a base of a vibration body, and the other end is pasted with a permanent magnet; two sides of the permanent magnet are provided with induction coils respectively; and two side magnets are placed behind the two induction coils respectively. According to the invention, the environment adaptability and the energy harvesting efficiency of the energy harvester are improved; and the energy harvesting bandwidth can be effectively expanded. The piezoelectric-electromagnetic composite low-frequency broadband energy harvester harvests energy under vibration conditions by using a piezoelectric effect and an electromagnetic effect, can generate large current and high voltage, effectively makes up defects of a piezoelectric or electromagnetic independent energy harvesting mode, can achieve simultaneous output of high voltage and high current by using an effective energy conversion circuit, and is more conducive to charging a rechargeable battery or a super-capacitor.

The present invention relates to a layout for antenna loops having both functions of capacitance induction and electromagnetic induction, and particularly relates to the layout for antenna loops having both functions of capacitance induction and electromagnetic induction, wherein the capacitance detection elements are integrated with the antenna loops. In this layout for antenna loops, each of the antenna loops therein is separated into three sections, and there are several geometric structures fabricated in two of these sections. These geometric structures are capacitance detection elements. Therefore, the two sections are directly fabricated to be the capacitance detection elements because of these geometric structures. By this way, the antenna loops can be integrated with the capacitance detection elements and the capacitance detection elements do not prevent the antenna loops from receiving the electromagnetic signals.

The invention relates to a thermal barrier coating part electromagnetic eddy current thermal imaging non-destructive detection system and a detection method thereof. The detection system comprises an electromagnetic heating device connected with a thermal barrier coating part requiring detection, an infrared thermal imager, and a computer connected with the infrared thermal imager. The detection method comprises that: a conductor coil of the electromagnetic heating device is wound on a thermal barrier coating part requiring detection, the conductor coil is connected with a power supply system, the infrared thermal imager is adopted to carry out infrared image acquisition on a coating surface temperature field of the thermal barrier coating part requiring detection, the acquired image is input into the computer, and computer processing is performed to finally obtain the detection result. According to the present invention, electromagnetic induction is adopted to heat a high temperature alloy substrate, and the ceramic coating surface temperature field is monitored to obtain defect distribution; heat generated by eddy current is uniformly distributed, the detection result has high accuracy, and errors due to different heat flow injection directions are avoided; the detection process does not cause damage on the thermal barrier coating part requiring detection; and detection speed is rapid, efficiency is high, operation is convenient, and cost is low.

The invention relates to a technology for rotating or moving mechanical part non-contact type power supply and information transmission, in particular to a non-contact type electric energy and data integral slip ring type transmission method. The method is characterized in that two oppositely movable permeability magnetic materials are at least included, induction coils are respectively arranged in the two oppositely movable permeability magnetic materials, and an air gap is formed between the two oppositely movable permeability magnetic materials; one induction coil of the two oppositely movable induction coils converts the electric energy into energy of electromagnetic field, and the energy of electromagnetic field is transmitted to the other coil by using the loosely-coupled electromagnet induction transmission principle. The non-contact type electric energy and data integral slip ring type transmission method has high reliability and long service life, and not only can transmit the high-power electric energy in a non-contact type, and realizes the bidirectional multichannel data communication at the same time.

Systems for harnessing power through electromagnetic induction utilizing printed coils are provided. A system can include one or more moveable magnets adjacent to printed coils on a circuit. For example, a system can include one or more magnets that are operative to move alongside a circuit board that includes printed coils. The one or more magnets may move, for example, when a user shakes the system or when the user walks or runs while holding the device. The movement of the one or more magnets may create an electromotive force (e.g., a voltage) across the printed coils, and this force may be used to generate electric power.

Embodiments of the subject invention pertain to a method and apparatus for vibrational energy harvesting via electromagnetic induction using a magnet array. Specific embodiments of the subject invention incorporate at least one conductive coil and at least one magnet array. Magnets used in such magnet arrays can be permanent magnets of various shapes, such as arc-shaped, square, rectangular, wedge, or trapezoidal. These magnet arrays can then be, for example, circular, hexagonal, rectangular, or square in external shape and create various types of internal magnetic fields, such as dipole, quadrupole, hexapole, or octapole magnetic fields. Through use of a magnet array, embodiments of the invention can increase the strength of magnetic fields by approximately 10 times compared to typical vibrational energy harvesters. The 10 time increase in the strength of the magnetic fields can result in up to a 100-fold increase in power. Preferably, the magnetic fields created by the subject device are substantially, if not completely, enclosed within the device.

Circuitry for use in a primary unit of an inductive power transfer system to generate an electromagnetic field so as to transfer power wirelessly by electromagnetic induction to one or more secondary units of the system, the or each secondary unit being separable from the primary unit, the circuitry comprising: a plurality of drivable portions, each portion comprising a primary coil or a dummy coil; driving means operable to supply both or at least two of said portions with drive signals so as to cause those driven portions that have a said primary coil to generate said electromagnetic field; and control means operable, in dependence upon a feedback signal indicative of a characteristic of the primary or dummy coil of one or more of the driven portions, to control the circuitry so as to tend to regulate said feedback signal, wherein the circuitry is configured so that; those portions that are driven are connected together in parallel and have a tuned resonant response; and said control tends to regulate such a characteristic of each of said driven coils.

A wireless power transfer apparatus includes: a transmitting coil into which a current having a predetermined frequency is introduced; a receiving coil configured to supply a current induced by electromagnetic induction to a load; and a transmission-side resonant coil and a reception-side resonant coil positioned between the transmitting coil and the receiving coil, configured to provide the current flowing in the transmitting coil to the receiving coil through electromagnetic induction, and spaced a predetermined distance from each other. Each of the resonant coils has a spiral structure.

A method and apparatus for transmitting power to active touch stimulating devices associated with a touch sensing apparatus. In this invention four methods of providing power supply to the touch-input device are presented. These methods are: EM induction transmission using a single loop antenna, EM induction transmission using a conductive layer, acoustic transmission through air, and acoustic transmission through an acoustic conductive layer.

A method and apparatus for motional/vibrational energy harvesting are disclosed. Embodiments of the subject invention utilize the non-resonant chaotic behavior of a free-rolling magnet to generate power. In one embodiment, the magnet can be spherical, cylindrical, or elliptical. The magnet can roll about a linear, cylindrical, helical, or cage-like track. The changing magnetic flux due to the magnet rolling about the track induces current in surrounding coils. The coils can be provided around the track using a continuous winding placement, segmented winding placement, or fractional winding placement. Multiple coil phases are also possible. For embodiments utilizing multiple magnets, spacers can be used to maintain a separation between magnets.

This invention relates to one electromagnetic sense interacting electron board and system, which comprises input part, edge frame on input part, control circuit and computer connected interface or outside wireless radio frequency module, wherein, the control circuit comprises micro processor and control circuit; the input part comprises write layer and down sensor layer; the sense layer output is connected to control circuit; the sense layer comprises sense coils along X and Y axis directions with cross points insulated; the micro processor is set with time division operation program to generate different frequency wave electron pen and other operation; the system comprises electron board and more than different radio electromagnetic wave electron pen.

A current sensor measures an electrical current flowing in well casing or other magnetic structure. The current sensor can be installed in a tool for performing electromagnetic (EM) induction surveying in a wellbore lined with an electrically conductive casing. The tool includes an EM element to transmit or receive a magnetic field through the casing. The measured current using the current sensor can be used to relate the change of casing effect on the EM element (e.g., an induction receiver) placed inside the well casing for performing the EM induction survey.

The invention relates to an energy acquisition technology of mechanical energy, and particularly relates to a friction-piezoelectric-magnetoelectric compound three-dimensional space multi-degree-of-freedom micro-energy acquisition device which comprises electromagnetic induction coils, an external spherical shell, a buffer layer, a piezoelectric layer, a frictional layer, an internal spherical shell and a magnet ball which are arranged from outside to inside in turn. All the coils are connected in a series mode; the buffer layer is arranged between the external spherical shell and the piezoelectric layer in a spacing way and aims at increasing piezoelectric deformation quantity and then enhancing power generation capacity; and positive materials and negative materials in frictional units are arranged in an alternating way, all the positive materials are connected together, all the negative materials are connected together, and charge transfer between the positive material and the negative material is realized by rolling of a movement unit between the positive material and the negative material. Mechanical energy acquisition of multi-degree-of-freedom movement modes is realized by utilizing three-dimensional space rolling of the movement unit in the hollow spherical shell; and piezoelectric, magnetoelectric and frictional power generation units with complementary working modes are integrated so that high-efficiency acquisition of mechanical energy is realized.

A method and device for emitting radial seismic waves in a material medium by electromagnetic induction, used notably for generating seismic waves in cased or uncased wells or in a water mass is disclosed. Emission of radial waves is essentially obtained by radially expanding a metal tube (1) under the effect of a magnetic pressure generated by electromagnetic induction with elastic waves being created in the medium under the effect of this expansion. The magnetic pressure is obtained by connecting a coil (2) in line with the tube to a current generator (3). The winding pitch of coil (2) can be constant or variable. Tube (1) can for example be added into a well or hole or it can be a tube portion of a cased well.

The invention discloses a hybrid excitation permanent magnet motor for wireless transmission and tooth harmonic excitation in the technical field of motors. A stator and a rotor are arranged in a shell; a rotating shaft passes through a central hole of a rotor core and is fixed with the rotor core; the rotating shaft is connected with the shell through a bearing; a stator winding corresponds to apermanent magnet and a rotor exciting winding to generate electromagnetic induction; a rotor tooth harmonic winding and the rotor exciting winding are connected with a chopper circuit through a dioderectifying circuit; a driving signal of a switching element in the chopper circuit is acquired through a wireless receiving module; an excitation control system outputs a pulse signal to a wireless transmitting module, transmits the pulse signal to the wireless receiving module on the rotor through the wireless transmitting module, controls the on/off of the switching element in the chopper circuit and provides the needed exciting current for the rotor exciting winding; therefore, an air-gap field and the output voltage of the stator winding are adjusted. Compared with the prior art, the hybrid excitation permanent magnet motor has no electric brush, collecting ring, additional air gap or axial magnetic circuit, is simple in structure, low in flux leakage, low in electric excitation loss and high in motor efficiency, and has high capacity of adjusting a main field.