2841 results about "Magnetic loop" patented technology

Systems, methods, and computer program products for induction charging with a closed magnetic loop are described herein. In one aspect, an apparatus for wireless power transmission comprises a plurality of coplanar coils, each of the plurality of coplanar coils configured to be individually energized and produce a magnetic field. Further, the controller is configured to reverse polarity of the magnetic field of at least one of the plurality of coplanar coils based on a measure of coupling between coils and to select at least two of the plurality of coplanar coils for wireless power transmission based on the measure of coupling between coils.

The present invention relates to a magnetic ring unit and a magnetic memory device; an object of the invention is to control the direction of rotation of the magnetic flux freely and with high reproducibility in a simple structure without using a thermal process such as pinning; and a magnetic ring unit is formed of a magnetic ring in eccentric ring form where the center of the inner diameter is located at a decentered position relative to the center of the outer diameter.

A power semiconductor package is disclosed with high inductance rating while exhibiting a reduced foot print. It has a bonded stack of power IC die at bottom, a power inductor at top and a circuit substrate, made of leadframe or printed circuit board, in the middle. The power inductor has a inductor core of closed magnetic loop. The circuit substrate has a first number of bottom half-coil forming conductive elements beneath the inductor core. A second number of top half-coil forming conductive elements, made of bond wires, three dimensionally formed interconnection plates or upper leadframe leads, are located atop the inductor core with both ends of each element connected to respective bottom half-coil forming conductive elements to jointly form an inductive coil enclosing the inductor core. A top encapsulant protectively encases the inductor core, the top half-coil forming conductive elements, the bottom half-coil forming conductive elements and the circuit substrate.

A receiver device (10) for receiving audio signals from a remote source is provided, comprising: a magnetic loop antenna for receiving radio frequency signals carrying audio signals, a signal processing unit for reproducing audio signals from the radio frequency signals received by the antenna, an output interface which is capable of being mechanically connected to an input interface of a hearing instrument to be worn at a user's ear in order to supply the audio signals from the signal processing unit as input to the hearing instrument, and a housing enclosing the antenna and the signal processing unit, wherein the antenna is designed as a printed board circuit with a loop-like conductor on an at least partially flexible insolating substrate and comprises a first portion defining a first plane and a second portion defining a second plane, wherein the first plane and the second plane are oriented at an angle of 60 to 120 degrees relative to each other.

A broadband antenna including both electric and magnetic dipole radiators is provided herein. The broadband antenna may be referred to as a “P×M antenna” and may include a pair of magnetic loop elements, each having multiple feed points symmetrically spaced around the loop element. The broadband antenna may also include an electric dipole element arranged between the pair of magnetic loop elements. In general, the electric dipole element and the magnetic loop elements may be coupled together through a network of transmission lines, as opposed to being incorporated into a single radiative element.

The present invention relates to a self-contained counterpoise compound field antenna. Improvements relate particularly, but not exclusively, to compound loop antennas having coplanar electric field radiators and magnetic loops with electric fields orthogonal to magnetic fields that achieve performance benefits in higher bandwidth (lower Q), greater radiation intensity / power / gain, and greater efficiency. Embodiments of the self-contained antenna include a transition formed on the magnetic loop and having a transition width greater than the width of the magnetic loop. The transition substantially isolates a counterpoise formed on the magnetic loop opposite or adjacent the electric field radiator.

The invention discloses a road foundation layered vertical settlement and transversal displacement automatic monitoring device and a monitoring method thereof in the technical field of optical measurement. The invention adopts a technical proposal that the automatic monitoring device comprises a measuring and positioning unit, a laser displacement sensing unit, a laser angle sensing unit, a measuring signal control unit, a measuring data transmission unit, a central processing unit and a power module; and the automatic monitoring method comprises: firstly, assembling various devices; secondly, starting a pulling device, stopping the device when a positioning sensor arrives at a position of a magnetic ring, measuring displacement data and angle data, and transmitting the data to the central processing unit for storage; thirdly, restarting the pulling device, and repeatedly measuring and saving the data until a measuring tube contacts a limit switch; and processing all the data of the central processing unit, and obtaining road foundation vertical settlement and transversal displacement parameters. The automatic monitoring device and the automatic monitoring method apply laser measurement technology, improve the measurement precision and the measurement depth, and simultaneously realize remote automatic monitoring.

In a transponder having an electronic memory chip and a magnetic ring antenna is provided that the ring antenna comprises an electrically conductive coil having at least one turn, and a capacitor, wherein the capacitor exhibits, as a dielectric, a thin insulator foil that simultaneously serves as a substrate foil for the coil and / or the chip.

To provide a rotation detecting device with a function of transmitting a rotational speed detection signal wireless and enable the rotation detecting device to be assembled compact in size without requiring any anti-rusting treatment to a multi-pole magnet assembly and a magnetic ring assembly, the rotation detecting device includes an electric power generator (11) for generating an electric power by a relative rotation between a non-rotatable member (1) and a rotatable member (7). The electric power generator (11) includes a multi-pole magnet assembly (13) and a magnetic ring assembly (12). A wireless transmission device (14) for transmitting the rotational speed detection signal outputted by the electric power generator (11) is employed. A sealing member (18) is also employed for sealing a working space delimited between the non-rotatable member (1) and the rotatable member (7), and the multi-pole magnet assembly (13) and the magnetic ring assembly (12) of the electric power generator (11) confront with each other at a location inwardly of the sealing member (18). The sealing member (18) is mounted on the magnetic ring assembly (12) or the wireless transmission device (14) of an annular configuration.

An axial magnetic bearing consists of a bearing body, an exciting coil, a permanent magnet, a magnetizer ring and an exciting gap. The permanent magnet contacting closely to the bearing body produces magnetic fields in different polarities separately in the inner and outer gaps; the exciting coil wound onto the bearing body generates the exciting magnetic flux; and the magnetizer ring contacting closely to the permanent magnet forms exciting gap between the magnetizer ring and the bearing body for providing the magnetic flux the exciting coil generates with magnetic path. The axial magnetic bearings of the present invention are used in pair in machine and the corresponding parts are made of magnetic permeable material. The present invention has the advantages of low magnetic reluctance, low exciting cut, low power consumption, small size, light weight, easy manufacture, etc. and may be used as the no-contact support for rotating part in machine.

The present invention relates to planar compound field antennas. Improvements relate particularly, but not exclusively, to compound loop antennas having coplanar electric field radiators and magnetic loops with electric fields orthogonal to magnetic fields that achieve performance benefits in higher bandwidth (lower Q), greater radiation intensity / power / gain, and greater efficiency.

A device determines a torque that is exerted on a shaft, the shaft having a first shaft section and a second shaft section, the two shaft sections being rotatable in relation to one another. The device comprise a multi-pole magnetic ring and a stator support that is fixed to the second shaft section. Two stator elements are fixed to the stator support and each stator element has fingers that project in an axial or radial direction, are uniformly distributed at least over part of the circumference and are interspaced by gaps. The magnetic ring is situated between the fingers of one stator element and the fingers of the other stator element. A second magnetic ring is located on one of the two shaft sections and a magnetic sensor is mounted on one of the two shaft sections.

A security tag includes an EAS component having a defined surface area, and an RFID component having a defined surface area. The EAS component surface area is configured to at least partially overlap the RFID component surface area. The RFID component includes an antenna which at least partially overlaps the first surface. A substantially planar spacer having a thickness is at least partially disposed between the defined surface areas of the EAS and RFID components. The RFID element read range is affected and controlled by the spacing between the RFID element and the EAS element. The RFID reader is capable of activating the RFID component when the RFID component is within the read range. The antenna includes a magnetic loop antenna in electrical contact with a spiral antenna to increase near field read response.

A low power consuming eternal magnetic external rotor magnetic axletree comprises outer magnetic loop, eternal magnet, iron stators, magnetism irritation loop, inner magnetic loop, iron stators and air clearance. On each side of X and Y axes, each two iron stators constitute eight magnetic pole in four directions. On each magnetic pole enwind magnetism irritation loop, outside of the iron rotors is the outer magnetic loop, inside the iron rotors are the iron stators, where between the rotors and stators leave air clearance. The inner magnetic loop fix inside of the iron stator. The eternal magnet locates between two inner magnetic loops. The two inner loops link with two iron stators to make a magnetic circle.

The invention provides a magnetic field modulating type concentric magnetic gear transmission device in a Halbach magnet structure, which comprises a shell, an outer rotor and an inner rotor, whereinthe outer rotor and the inner rotor are installed in an inner cavity of the shell and are in a cantilever type; the inner rotor comprises an inner rotor iron core and a permanent magnet, which are installed on an output shaft of the inner rotor; the outer rotor comprises an outer rotor iron core and a permanent magnet, which are installed on an output shaft of the outer rotor; a magnetic modulation ring is arranged between the permanent magnet of the inner rotor and the permanent magnet of the outer rotor; and the magnetic modulation ring comprises an iron core block and is fixed on an end plate of the shell. The magnetic gear transmission device comprises two layers of air gaps, wherein an inner-layer air gap is formed between the inner rotor and the magnetic modulation ring, and an outer-layer air gap is formed between the outer rotor and the magnetic modulation ring. The magnet structure uses a Halbach array to replace the conventional radial structure, thereby improving the magnetic density distribution of the air gaps of the magnetic gear transmission device. Because the magnetic density of the air gaps approaches to sinusoidal distribution, the detent torque of the magnetic gear transmission device in the structure is greatly reduced, thereby decreasing the vibration and noise of the magnetic gear transmission device and improving the running efficiency.

The invention relates to a permanent magnet bias inner rotor radial magnetism bearing that is made up of out magnetizer, out magnetism separator, exciting winding, inner magnetizer, rotor iron core. Four stator iron cores form four magnetic poles and are connected with each other by out magnetism separator. Eight stator iron core forms eight magnetic poles and every stator magnetic pole has exciting winding. Outside the stator iron core is out magnetizer that is connected to stator iron core. The permanent magnet is located between the two out magnetizers. Inner the stator iron core is rotator iron core. And there is clearance between the inner surface of the stator iron core and the out surface of the rotator iron core. The second clearance exists between the out magnetizer and the permanent magnet to form electric excitation circuit. The invention has the advantage of reliability and easy to be controlled.

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 detacher unit for disengaging a combination EAS / RFID tag from its article. The detaching unit detaches the spring clamp mechanism of a combination EAS / RFID tag when the tag is placed within a particular region within the detaching unit. A near field magnetic loop antenna is situated within the placement region in a housing. When the combination EAS / RFID tag is placed within the placement region just above the near field magnetic loop antenna, the RFID code of the tag is read and the detachment unit releases the clamp mechanism that attaches the EAS / RFID tag to its article.

The innovation points of the invention are that stator core is designed as E shape, and one fault tolerant tooth is added to each stator core. Winding is enwound on armature tooth and permanent magnet on two sides of E shaped stator core. There is no winding on fault tolerant tooth. Windings on radial opposite two poles are connected in series to constitute one phase. Fault tolerant tooth insulates phase windings. Excitation magnetic field is produced by permanent magnet. Fault tolerant tooth provides magnetic loop for permanent magnet and armature winding. The invention makes circuit, magnetic circuit, and temperature field independent between phase to phase of motor. The fault tolerant motor possesses higher reliability, and capability of operation under fault. Reducing width of gullet can reduce pulsation of torsion. Magnet core can run at inflection point of magnetization curve. The motor is especially suitable to areas of high reliability of continuous operation.

The invention discloses an automatic detection system and a detection method of a finished product magnet ring image. A magnet ring automatic loading disc, an inclined slide groove, a straight ling baffle plate with width adjustable and a conveyor belt are sequentially arranged at one end of a first detection bracket. The magnet ring is limited inside a track through the straight line baffle plate. The upper end surface of the magnet ring is detected through a first area array charge coupled device (CCD) camera. The other end of the first detection bracket is provided with an automatic turn-over device of the magnet ring. A second detection bracket is arranged on the back of the magnet ring turn-over device. The magnetic ring is pushed to a conveyor belt of the second detection bracket through a pneumatic turn-over pushing plate device and passes through the track limited by the straight line baffle plate, and the lower end surface of the magnetic ring is detected through a second area array CCD camera. A third camera bracket is arranged on the back of the second detection bracket, and a linear array CCD camera is arranged on the lateral side of the second detection bracket to detect the lateral side of the magnetic ring. The automatic detection system and the detection method of the finished product magnet ring image can realize full-automatic detection of the sizes of the inner diameter and the outer diameter of the magnetic ring and flaws on the end surfaces and the lateral side of the magnetic ring, and therefore detection time and labor cost are reduced, and work efficiency is improved.

A rotational apparatus with one or more passive magnetic bearing(s) is described. The rotational apparatus includes a rotor with a tapered magnetic ring and a stator with a tapered array of shorted conducting circuits. A repulsive force between the tapered magnetic ring and the tapered array of shorted conducting circuits acts a passive magnetic bearing that centers the rotor radially in a stator cavity and that repels the rotor axially away from an end of the stator cavity.

The invention belongs to the technical field of magnetic grinding, and in particular, relates to an inner surface polishing device of a large-length-diameter-ratio slender pipe and a method thereof. The polishing device is characterized by comprising a machine tool body, a moving mechanism arranged on the machine tool body, a workpiece clamping mechanism arranged on the machine tool body and a grinding mechanism arranged on the machine tool body; the grinding mechanism includes an ultrasonic generator and a magnetic grinding device; and the magnetic grinding device includes an external grinding device and an internal grinding device. The polishing device adds ultrasonic vibration into the traditional magnetic grinding process, so that magnetic grinding particles generate a high-frequency impact effect on the inner surface of the slender pipe; an auxiliary magnetic pole is added in an inner cavity of the slender pipe for forming a magnetic loop with an external magnetic pole, so that the magnetic induction strength of unit space is improved, and the grinding pressure is also increased; and the material removing quantity is 1.5 times of that in traditional magnetic grinding.

The invention relates to a dishing vertical takeoff and landing aircraft, namely a dishing magnetic suspension aircraft. The aircraft has an overall layout according to a dishing outline. An upper magnetic suspension ring-wing and a lower magnetic suspension ring-wing are suspended between an engine room 700 and a fixed ring 100 by a magnetic suspension driving device. The elevation angles of an upper ring-wing blade and a lower ring-wing blade are opposite to each other, and the driving forces of ring-wing power-drive magnetic rings (blocks) (2200 and 2600) are opposite to each other. The magnetic suspension ring-wing structure makes use of an electromotive power magnetic suspension driving principle to ensure that upper and lower magnetic suspension ring-wings are not only uprising and hovering rotor wings, but also an effective extension of fixed wings during forward flight. When the 2200 and the 2600 are loaded with electric power, a magnetic force drives the upper and lower ring-wings to rotate reversely to generate a lift force. The steering of the aircraft is also adjusted by the rotating speed of the upper and lower ring-wings. The forward flight is carried out by a driving device 800. The aircraft integrates the advantages of the fixed wing, a helicopter and a motor-less rotorcraft, can take off and land vertically, hover, cruise at a low altitude at a low speed, and can fly at a high speed. The dishing magnetic suspension aircraft overcomes the defects of the aircraft, is not provided with a mechanical device, is simple in control, and is high in safety.