276results about How to "Strong magnetic field" patented technology

This document discusses, among other things, an apparatus comprising a lacrimal implant insertable at least partially into a lacrimal punctum. The lacrimal implant comprises an implant core, and an implant body. The implant body includes a cavity sized and shaped to receive the implant core. At least one of the implant core and the implant cavity includes a detection device configured to allow automatic detection of the lacrimal implant with a separate detector device.

A permanent magnet synchronous machine with improved torque and power characteristics. A circumferential-oriented rotor assembly is provided with alternating permanent magnets and magnetic pole pieces. In order to reduce the amount of leakage flux in the rotor and increase the effective length of the permanent magnet, a trapezoidal or otherwise tapered permanent magnet structure is used. By alternating trapezoidal permanent magnet, and magnetic pole pieces, a higher intensity magnetic field is created in the air gap utilizing the same radial space in the motor without altering the weight or volume of the motor compared to conventional machines.

The invention discloses a mobile terminal with a rotation camera. The mobile terminal with the rotation camera comprises a terminal main body and a rotation camera component which is arranged at the top of the terminal main body and can rotate relatively to the terminal main body, wherein a Hall sensor is arranged at one end of the terminal main body, close to the rotation camera component, the Hall sensor is electrically connected with a central processing unit, a first magnet and a second magnet are arranged on a position in the rotation camera component, corresponding to the Hall sensor, the first magnet and the second magnet are bar magnets, a polarity of the first magnet and a polarity of the second magnet, which are the same, are oppositely arranged, and the first magnet, the second magnet and the Hall sensor are located on the same straight line under the circumstance that the rotation camera component is not rotated. The invention further discloses a camera angle control method of the mobile terminal with the rotation camera. By adopting the technical scheme, the mobile terminal with the rotation camera has strong magnetic field intensity, can effectively improve detection precision, and enables rotation angle detection to have good interference resistance.

A camera module that can be used in small-sized electronic apparatuses such as digital cameras, camera-equipped cellular phones and the like is provided. The camera module includes a lens unit which constitutes an optical system of the camera module; a holder which houses the lens unit and is displaceable along an optical axis direction of the lens unit; a coil provided on the holder, the coil being formed to have an octagon shape in its horizontal cross section having eight outside surface portions; a yoke having an outer cylindrical wall portion formed to have an octagon shape in its horizontal cross section which is similar to and larger than the octagon shape of the coil and having eight magnet mounting inner surfaces; eight flat plate-shaped magnets respectively provided on the magnet mounting inner surfaces of the yoke for providing a magnetic field to the coil in cooperation with the yoke, each of the eight flat plate-shaped magnets being arranged so as to face each of the outside surface portions of the coil through a predetermined constant spacing; upper and lower leaf springs respectively attached to upper and lower cylindrical end portions of the holder for supporting the holder so as to be displaceable along the optical axis direction of the lens unit; and a base for supporting the yoke and the lower spring.

A jewelry apparatus and process for holding an article to a person's clothing. A rare earth magnet is attached to one side of a piece of jewelry and connected with a chain or cord to a second rare earth magnet. The two magnets are magnetically held together through a person's clothing allowing eyeglasses or another article to be removably hung on the chain or cord.

A dielectric resonator having variable cross-section, preferably varying monotonically, and, most preferably, the resonator being in the shape of a truncated cone. Such shapes displace the H₁₁ mode from the TE mode in the longitudinal direction of the cone. Truncating the cone to eliminate the portion of the cone where the H₁₁ mode exists, virtually eliminates the H₁₁ mode. A circuit comprising a plurality of these resonators may be arranged in an enclosure with each resonator longitudinally inverted relative to adjacent resonator(s) to provide a compact design with enhanced coupling and adjustability. A spiral coupling loop provides high magnetic flux in a small physical volume for coupling energy into or out of the circuit. Alternately, the resonator can coupled to a microstrip by placing the resonator upside-down near the microstrip, whereby the TE mode is immediately above the microstrip, providing enhanced coupling there between.

The utility model discloses a magneto-stretch sensor used for detection of ultrasound ultrasonic waveform, which belongs to the technical field of acoustic sensors. Bias magnetic circuit which is provided with a plurality of steel stranded wires (1), a jaw (2), a saddle (3), a permanent magnet (4) and a yoke iron (5) makes the magnetic field generated in the steel stranded wires (1) to rotate with the field biased along the direction of the magnetic field. The excitation signal issued by signal generator enter the first enameled wire (7) after being enlarged in a power amplifier. An alternating current magnetic field is produced by the stranded wires in an incentive-in solenoid sensor (6), the coordination of the bias magnetic field and the alternating magnetic field caused by the magnetic domain in the stranded wires are swung back and forth along the axial direction of the magnetic domain, and the change of the magnetic domain is received to the receiving end of the solenoid sensor. The signal is received to the oscilloscopes by a second enameled wire (8), and the waveforms of the signal are displayed by the oscilloscope. The utility model has the advantages that the utility model has low price, ultrasound guided wave can be detected without grinding end face of the stranded wires, and repeatability and operability of detection are improved effectively.

The invention provides a moving-magnetic type linear vibration motor. The moving-magnetic type linear vibration motor comprises a casing with an accommodating space, two elastic elements, a mass block, two magnets and two coils, wherein the two elastic elements are connected to the side walls of the casing oppositely; the mass block and the two elastic elements are connected and suspended in the accommodating space of the casing through peripheral walls respectively; the two magnets are fixedly connected to two ends of the mass block respectively, and the center connecting lines of the magnetsand the two elastic elements form an acute angle or an obtuse angle; the two coils are fixed on the casing with the corresponding magnets at intervals, and the center connecting lines of the coils and the two elastic elements form an acute angle or an obtuse angle. Lorentz force received by the coils can be decomposed into component force in the first direction of the center connecting line of the two elastic elements and component force in the direction perpendicular to the second direction of the center connecting line of the two elastic elements, and the magnets correspondingly receive twoacting forces in opposite directions, wherein the two acting forces are equal to the two component forces of Lorentz force received by the coils. A vibrator assembly comprising the magnets and the mass block can vibrate in two mutually perpendicular directions.

The invention provides a dual-rotor axial disk-type permanent magnet motor. A dual-motor and intermediate stator mode is adopted in structural layout, and magnetic flow is axial in direction; dual rotors output rotation speed and torque through a rotating shaft connected with the dual rotors, and permanent magnets arrayed in a trapezoid halbach form are arranged on inner sides of the rotors. The motor stator is designed in a non-yoke structure and adopts a multi-tooth combination and is fixed on a main case; the main case is in topology design, vent holes are arranged in the surface of the main case, and passive heat dissipation of the motor is facilitated; the dual-rotor axial disk-type permanent magnet motor has the advantages of small size, light weight and high power-to-weight ratio and is applicable to equipment of electric and hybrid cars, aircrafts and the like. The invention further relates to a non-rotor core structure design, and the power-to-weight ratio of the motor is further increased.

The functional magnetic Temali fiber has ingredients including polymer, magnetic particle, superfine Temali powder and coupling agent. Compared with available far infrared magnetic fiber, the functional magnetic Temali fiber has the advantages of capacity of generating strong magnetic field, and natural superfine Temali powder no harm to human body and no environmental pollution. The superfine Temali powder has weak current of 0.06 mA to stimulate skin constantly, strengthen the regulating effect of nerve system and promote body's blood circulation, and can generate high density negative oxygen ion. The fiber of the present invention may be used in producing clothing, bed ware and other health products with the effects of strengthening cell activity and myocardial function, improving sleep and promoting metabolism.

The invention provides an antenna device and a mobile terminal with the same. The antenna device comprises at least two layers of stacked coils; a second feed point electrically connected to an NFC (Near Field Communication) chip or an RFID (Radio Frequency Identification) chip is respectively arranged on the coils, and a first feed point electrically connected to a WPC (Wireless Power Consortium) chip or an FM (Frequency Modulation) chip is respectively arranged on the two coils of the surface; and the two adjacent layers of coils are isolated by an isolating unit, and the isolating unit is configured to isolate working signals of the NFC chip or the RFID chip. The antenna device realizes superposition of effective area of antennas via multilayer superposed coils, the coils can be connected or isolated to support two different functions, and multiplexing of the antenna device is realized; meanwhile, in the NFC or RFID working mode, the intensity of the radiation electromagnetic field can be improved, and the NFC or RFID communication performance is optimized.

A variable orifice flow sensor (10) includes a flow conduit member defining a flow orifice and fluidly connecting first and second fluid flow ports (12, 16), a flapper of magnetizable sheet metal that is mount in the conduit member by a hinge portion so that the flapper angularly deflects out of the plane of the orifice (18) in response to fluid flow through the conduit member to vary the effective fluid flow cross-sectional area of the orifice in proportion to the flow rate of fluid through the conduit member, and a pressure sensing tap on either side of the flapper. A deflection-limiting surface is provided in the conduit member adjacent the hinge portion. The hinge portion abuts against the deflection-limiting surface when the flapper experiences an angular deflection at least equal to a predefined angle in response to a fluid flow rate that is at least equal to a predetermined value, whereby overstressing the hinge portion is minimized.

The invention relates to a method for nondestructively testing micro-defects in sheet ferromagnetic materials based on measurement of magnetostatic force and belongs to the technical field of nondestructive testing. The method comprises the following steps: arranging a permanent magnet on the surface of a calibration sheet, and measuring reacting force of magnetostatic force which acts on the permanent magnet by using a force sensor; arranging the permanent magnet on the surface of a sheet to be measured, and measuring reacting force stressed by the permanent magnet by using the force sensor; and comparing the two reacting forces, if the same, determining that a surface defect or an internal defect does not exist on the sheet to be measured, and if different, determining that a surface defect or an internal defect exists on the sheet to be measured. The method is simple in measurement process, relatively low in detection cost and reliable in detection result; the measurement accuracy is high, and micron order micro-defects in the magnetic sheets can be detected; the detection speed is high, and sheet materials can be rapidly detected on line in real time.

The invention discloses a method for using voltage source frequency converter to drive a synchronous motor, comprising a control method on the start synchronization of synchronous motor, a control method in continuous operation, a control method on normal stop and emergency stop, a method cooperated controlling the excitation device of the synchronous motor, and an accident protect method in the operation of the synchronous motor. The invention is characterized in that the invention can use voltage resource frequency-converter to drive synchronous motor, to stably start, stop and operate at high-frequency of frequency conversion. And in emergency, the invention can reliably protect synchronous motor, frequency converter and the excitation device.

A reconfigurable electric motor includes a rotor containing rotatable permanent magnets or non-magnetically conducting shunting pieces. The magnets and/or shunting pieces have a first position producing a weak magnetic field for asynchronous induction motor operation at startup and a second position producing a strong magnetic field for efficient synchronous operation. The motor includes a squirrel cage for induction motor operation at startup with the permanent magnets and/or shunting pieces positioned to product the weak magnetic field to not interfere with the startup. When the motor approaches or reaches synchronous RPM, the permanent magnets and/or shunting pieces rotate to produce a strong magnetic field for high efficiency synchronous operation. The position of the magnets and/or shunting pieces may be controlled by a centrifugal mechanism, or viscous damping may delay rotation of the magnets and/or shunting pieces, or electrically controlled apparatus may control positions of the magnets and/or shunting piece.

The invention discloses a curved surface wall-climbing robot for surface cleaning. The robot comprises a front wheel driving mechanism, a rear wheel driving mechanism, a posture adjusting mechanism and a cleaning and derusting mechanism; the front wheel driving mechanism and the rear wheel driving mechanism are the same in structure; a steering motor in the posture adjusting mechanism drives a front wheel rotating claw and a rear wheel connecting claw to rotate, then a connecting rod is driven to move, so that the front wheel driving mechanism and the rear wheel driving mechanism are divertedin opposite directions; a guide air driver and an air cylinder in the cleaning and derusting mechanism are fixed to the side face of a transverse beam through a mounting frame, by controlling the posture of a cleaning disc, the cleaning disc can swing; a soft rubber gasket is fixed on the lower side of the cleaning disc, and can tightly press a working wall surface; and a rotator nozzle is fixed to the center of the upper surface of the cleaning disc, is connected with a high-pressure water pipe, and sprays high-pressure water outwards through a spraying rod. The robot can climb on a curved surface with a large curvature, the operation environment and the operation capability of the robot are expanded, and meanwhile, the cleaning requirements under different postures can be met.

The present invention provides a bistable electromagnetic driver and a product with the same. The electromagnetic driver comprises the following components: a first permanent magnet (301); a second permanent magnet (302) which is equipped relatively to the first permanent magnet (301) and has same polarity with the first permanent magnet; a movable member (303) which is provided between the first permanent magnet (301) and the second permanent magnet (302) and is wound by excitation coil (304), wherein through exerting current with different directions to the excitation coil (304), the movable member (303) can move between the first permanent magnet (301) and the second permanent magnet (302). The bistable electromagnetic driver provided by the invention has the advantages of good stability and low energy consumption.

The invention discloses a double-stator doubly salient hybrid excitation motor drive system, and the system comprises fault reconstruction five-phase T-type three-level inverters and a double-stator doubly salient hybrid excitation motor; two sets of windings of the double-stator doubly salient hybrid excitation motor are separately powered by two sets of fault reconstruction five-phase T-type three-level inverters, and the two sets of fault reconstruction five-phase T-type three-level inverters are independent with each other. The double-stator doubly salient hybrid excitation motor adopts a double-stator structure which comprises an outer stator, an inner stator, doubly salient rotor, a permanent Nd-Fe-B magnet, a permanent Al-Ni-Co magnet, a magnet regulating coil and an armature winding; and the two stators share one doubly salient rotor. According to the invention, the double-stator doubly salient hybrid excitation motor drive system is provided, a control method of the system is also provided, and the system has advantages of high power density, high efficiency, high reliability, high magnet regulating ability and the like.

A nuclear magnetic resonance well logging machine probe permanent magnet for generating gradient magnetic field in ground layer, engaged with nuclear magnetic resonance well logging machine to check the physical information of ground layer, is characterized in that a magnet post (86)is composed of adhered at least one small magnetic block (6), wherein the magnet is one portion of one cylinder. The invention sticks the magnet on well wall, while the magnet is N30 high-energy-accumulation samarium-cobalt magnet, with small volume, strong magnetic field, and high detection length. The invention simplifies the probe structure, improves the bearing strength of whole probe, improves the length of pre-polarized magnet, and improves detection speed, which can avoid blind area at the well wall direction, to improve detection accuracy, and generate gradient magnetic field along the well wall, to realize multi-dimension well logging.

The invention belongs to the field of oil and gas transmission pipeline cleaning, and particularly relates to a pigging working condition monitoring and blocking accurate positioning method for a buried oil and gas transmission pipeline cleaner, based on single shaft magnetic-flux-gate magnetic anomaly detection. The implementation method includes arranging a permanent magnet set on the cleaner; using weak field detectors arranged on an earth surface to monitor magnetic field fluctuation so as to determine whether or not the cleaner can normally pass; and using a weak field detector array to search and positioning a position of the cleaner along a blocked segment of a pipeline while the cleaner is blocked, and directing the excavation. The pigging monitoring and blocking positioning implementation method is easy to operate, is low in use cost, can effectively avoid environment pollution and influence on worker health, is rapid and accurate in positioning, and is remarkable in economic benefit.

The invention provides a magnetic rod antenna. The magnetic rod antenna comprises a magnetic rod and a wire, wherein a plurality of parts of the wire are sequentially wound around the magnetic rod to form a plurality of coils in an alternately sparse and dense manner, and the magnetic field intensity of the plurality of coils laminated on division magnetic fields of respective cross section of the same magnetic rod is higher than the magnetic field intensity of the total magnetic field of the coil formed by uniformly winding the existing wire around the magnetic rod. The magnetic rod antenna provided by the invention is longer in signal transmission distance, and is not susceptible to the interference of an outside environment; and moreover, with the magnetic rod antenna provided by the invention, the magnetic flux of the antenna can be improved.