61results about How to "Reduce the induction current" patented technology

A system for inductive power transfer that may selectively transmit power in a plurality of modes based on characteristics of a power receiver and determine which transmitter coils to drive based on received signal strength information. The inductive power transfer transmitter may detect characteristics of the power receiver in order to control the mode of the power transfer and selectively control which transmitter coils are driven based on signal strength information received from a power receiver. The power transmitter may have slugs formed of a magnetically permeable material within common coil winding openings and the transmitter coils may consists of a plurality of parallel windings.

A power receiving device includes: a ferrite member including a plurality of pieces of ferrite at least some of which are spaced from adjacent pieces of ferrite; a power receiving coil disposed on a lower surface side of the ferrite member; and a power receiving capacitor disposed on an upper surface side of the ferrite member. The power receiving capacitor has a closed loop circuit including first and second wiring connections and a plurality of capacitor elements connected in parallel between the first wiring connection and the second wiring connection. When the power receiving capacitor and the ferrite member are viewed from the lower surface side of the ferrite member, the closed loop circuit is located behind and within a perimeter of one of the pieces of ferrite. A power transmitting device has a mirror structure to the power receiving device.

The present invention discloses a hollow cathode heater and a hollow cathode structure, the heater comprises an inner ceramic skeleton (4), a heating wire (5) and an outer ceramic sleeve (6); outer side of the inner ceramic skeleton (4) and / or inner side of the outer ceramic sleeve (6) has a first a structure; the first structure is any one or any combination of a protrusion, a groove or a smoothsurface; the outer ceramic sleeve (6) is nested outside the inner ceramic skeleton (4), a first space is surrounded and formed between the outer side of the inner ceramic skeleton (4) and the inner side of the outer ceramic sleeve (6) through the first structure. The hollow cathode heater is easy to process and assemble, has high mechanical strength and high reliability, and has a serpentine heating wire, with induced magnetic fields at adjacent positions cancelling each other, can effectively reduce an induced voltage and an induced current generated by the induced magnetic fields at the ignition moment, reduce thermal shock of the heating wire and improve reliability and life span of a space electric propulsion system.

The invention discloses a straight down type backlight module for a liquid crystal display. The straight down type backlight module comprises an optical film, a diffuser plate arranged below the optical film, a plurality of paralleled lamp tubes arranged below the diffuser plate, a reflection piece arranged below the lamp tubes, a back plate arranged below the reflection piece, a plurality of back plate grooves which are formed by the back plate bent downward and are arranged on the back plate below the lamp tubes, or a plurality of back plate openings arranged below the lamp tubes. The straight down type backlight module of the invention can effectively reduce induced current caused by parasitic capacitance between the back plate and the lamp tubes, ensure the luminous efficiency of the lamp tubes and the luminous uniformity on both ends of the lamp tubes, and also reduce the thickness of the whole backlight module.

The invention relates to a grounding shield structure which applies a fractal theory. In existing on-chip spiral inductors and transformers, because an alternating electromagnetic field is produced, induction current is produced on a substrate, energy loss is produced, and an induction value and a Q value are reduced. The shield structure is arranged in the center of an inductor / transformer which is wound from a coil, and a pattern grounding shield layer of a first order, a second order, a third order and even a higher order is constructed with metal layers M1 and M2 with thin bottom layers based on H-shaped and crisscross basic units through the self similarity and iterative principle of the fractal theory. According to the novel fractal pattern grounding shield structure, the electromagnetic field which penetrates to the substrate is effectively shielded, so that the induction current which can be produced on the substrate and on the surface area of the substrate is reduced, and the effects of reducing the energy loss of the substrate and improving the induction value and a quality factor are achieved.

The invention relates to a method for preparing a TM mode harmonic oscillator, and the method comprises the following steps of manufacturing strip billet: printing a plurality of metal micro-structures which are periodically distributed on a green tape to prepare the strip billet; manufacturing barrel billet: coiling the strip billet on a rotating shaft to a preset thickness to obtain the barrel billet; sintering: conducting the low-temperature cofiring for the barrel billet to obtain the TM mode harmonic oscillator. The invention also relates a TM mode harmonic oscillator prepared by the method. Since a magnetic field direction when the TM mode is formed by a curved surface on which the metal micro-structures stay and the TM mode harmonic oscillator in a filter is basically parallel, the magnetic field can pass by the curved surface on which the metal micro structures stay, so that the sensing current produced by an alternative magnetic field is small, and the loss caused by the metal micro structures is small; and meanwhile, the metal micro structures are basically parallel to the direction of an electric field, so that the dielectric constant of the harmonic oscillator is maximally improved, and the sizes of a harmonic oscillation chamber and the filter are reduced.

The invention provides a launching method of a guided missile safe launching system. The safe launching system comprises a launching control system and a launching box / barrel. The launching control system comprises an ignition power source and a launching control unit. The launching control unit comprises a combat launching command relay, an engine ignition relay and a resistor. The launching box / barrel comprises a napalm bomb mechanism microswitch. After an initiating explosive device is connected with the resistor in parallel, one end of the circuit is sequentially connected with the napalm bomb mechanism microswitch, a first set of contact switches of the engine ignition relay and a first set of contact switches of the combat launching command relay in series; the other end of the circuit is grounded and then is sequentially connected with a second set of contact switches of the engine ignition relay and a second set of contact switches of the combat launching command relay in series. According to the safe launching system, the safety performance in missile launching can be improved.

This invention relates to a kind of three-phase AC permanent magnetic synchronous electric motor of variable-frequency timing containing a stator winding and a permanent magnet rotor etc. with the characteristics of adopting star-shaped connections by the stator winding, when designed basic frequency is 50Hz, 100Hz, 150Hz and 250Hz, and with reference of 50Hz the numbers of conductors of each phase winding of the motor stator should be 0.7, 0.58, 0.5 and 0.45 times of 50Hz, and the cross section areas of the conductors should be 1.414, 1.73, 2, and 2.24 times of 50Hz, the said rotor permanentmagnet and the magnet-conductive metal core share the perimeter of the rotor and the magnetic density generated by the permanent magnet should be one third of the density of the stator electric magnet. The numbers of the electric conductive

The invention discloses a multilayer on-chip integrated spiral inductor with a vertical structure. In the invention, by making the inductor into a structure vertical to a horizontal plane, not only the area of the inductor covering a substrate is reduced, but also the vortexes of a common inductor, which are coupled and inducted by the magnetism of a time-varying magnetic field in the substrate, can be weakened through a laminated structure, and therefore the induction currents generated in the substrate and on the surface area of the substrate are reduced, and consequently, the effects of reducing the energy loss of the substrate and enhancing the quality factors of the inductor can be achieved.

The invention discloses an ion migration and generation device and a control method of the ion migration and generation device. The ion migration and generation device comprises an ion generating and leading-out unit, an electric field electric potential gradient generating unit, an ion information acquisition unit and a circuit control system, wherein the ion generating and leading-out unit comprises an ion generating module, a gas circuit module, an ion leading-out module and an ion control gate module, the electric field electric potential gradient generating unit is composed of multiple electric field ring pieces and multiple insulating ring bodies, and the ion information acquisition unit comprises an ion flow receiver, an ion flow receiver insulator, an ion flow receiver shielding cup and an ion flow piece; under the control of a circuit control system, a gas sample is triggered by the ion generating and leading-out unit in the ion form and then enters the electric field electric potential gradient generating unit, and due to the fact that the flight durations (movement speeds) of different ions in an electric field are different, a substance to be detected can be analyzed by forming a spectrogram after information is acquired. The ion migration and generation device can serve as a substance detection instrument to be applied to the field of precise analysis.

This invention relates to a single phase AC permanent synchronous electric motor composed of a stator winding and a permanent magnet rotor in which the stator winding contains a main winding and a sub winding the same wire gauge and conductor coil numbers composed of single-layer single lap or single-layer cross winding. The permanent magnet of the rotor and the magnet conductive core share the perimeter of the rotor and the magnetic density generated by the permanent magnet should be one third of that of the stator electric magnet and the electric-conduction metal bar numbers of the rotor squirrel-cage are determined by 0.81-0.92 times of those of the stator core slots. The invention ensures the efficiency power and torque outupt with high efficiency and electricity energy saving.

The invention discloses a roller shutter door anti-falling device which is mainly used for preventing a roller shutter door from falling to hurt people and is simple in structure, capable of preventing the roller shutter door from falling in various states and safe and reliable in protection. The device is composed of a pair of stopping devices and a triggering device. The working principle is asfollows: when a door curtain of the roller shutter door ascends and stops, an electromagnet A and an electromagnet B of the pair of stopping devices are powered off at the same time, a spring extendselastically and drives a piston and a stop plate to move towards the inner surfaces of U-shaped bottom plates of the left door curtain sliding sleeve and the right door curtain sliding sleeve respectively and abut against the inner surfaces of the U-shaped bottom plates, and at the moment, no matter whether a chain wheel of a driving device of the door curtain is unhooked or broken or subjected toother abnormal conditions, the stopping devices can prevent the door curtains from falling; and when a door curtain of the roller shutter door descends, if the door curtain suddenly falls due to a certain reason, the triggering device triggers an electromagnetic switch to act, power supplies of the electromagnets A and B of the stopping devices are cut off, and a left stop plate and a right stopplate abut against the inner surfaces of the U-shaped bottom plates to prevent the door curtain from falling.

The invention relates to a novel fractal PGS (Program Generation System) structure. As the existing the on-chip spiral inductor and transformer generate an alternating electromagnetic field, induced current is caused on a substrate to generate energy consumption and reduce the inductance and the Q value. The PGS is located in the central part of a coil-wound inductor / transformer, a first-order, second-order, third-order, or even higher order pattern grounded shield layer is constructed by a metal layer with a thin bottom on the basis of an H-shaped basic unit and a cross-shaped basic unit through the self-similarity of fractal theory and the iterative theory. The novel fractal PGS structure screens out the electromagnetic field which permeates the substrate effectively, reduces the induced current which is capable of generating on the substrate and the substrate surface area, achieves the substrate energy consumption and improves the function of inductance and quality factor.

The invention discloses a high-voltage cable obstacle removal protection device, which comprises a device main body surrounded by an aluminum sheath, one side of the device main body is provided with a firewall, and the other opposite side of the device main body is provided with a branch box. Shutters are arranged around the box, branch openings are set inside the branch box, cable clamps are installed around the main body of the device except the bottom, circuit breakers and alarms are installed on the top of the main body of the device, and both ends of the main body of the device are equipped with Rotating shaft, the top of the rotating shaft is equipped with a fire extinguishing device, the two opposite sides of the main body of the device are equipped with manhole wells, the inside of the main body of the device is set with grooves, the outside of the grooves is covered with insulating materials, and the inside of the main body of the device is equipped with steel plates. The interior of the main body of the device is equipped with a return line and a temperature control device. This kind of high-voltage cable obstacle removal protection device can reduce the induced current when a short-circuit fault occurs and can keep the surrounding environment of the cable constant.

The invention relates to the technical field of the small motor manufacturing, and specifically relates to a reluctance suppression type motor winding skeleton and a linear voice coil motor. The winding skeleton comprises a body and an upper cover in fixed connection; the body is made of metal, and a through hole penetrating the interior is formed in the body, a cut slot is formed on the body along a through hole axial direction, and the length of the cut slot is greater than the motion displacement of an active cell in the linear voice coil motor. The motor comprises a motor active cell formed by winding coil on the winding skeleton, and further comprises an outer magnet, an outer yoke and an inner yoke; the outer yoke is coated on the outer surface of the outer magnet, the inner yoke isfixedly arranged in the outer magnet, and the motor active cell can be inserted into the gap between the outer magnet and the inner yoke and can reciprocate in the gap. Through the above structure, the movement resistance on the motor active cell is greatly reduced, the response speed of the voice coil motor in the running is effectively improved, and the system flexibility is improved; and meanwhile, the mechanical strength and the size requirement needed by the linear voice coil motor are guaranteed by the winding skeleton made of the metal material.

The invention belongs to the field of constructional engineering machinery, and particularly relates to a self-falling type efficient concrete mixer. The self-falling type efficient concrete mixer comprises a base, the upper end of the base is rotationally connected with a rotating cylinder through a supporting wheel, a plurality of movable plates arranged in the radial direction are arranged in the rotating cylinder, and the plurality of movable plates are arranged in an annular array mode; the movable plates penetrate through the side wall of the rotating cylinder and are in sliding connection with the rotating cylinder, the ends, away from one another, of the plurality of movable plates are fixedly connected with fixed plates, the fixed plates are fixed to the side wall of the rotatingcylinder through springs, and magnet blocks are installed on the side walls, away from the movable plates, of the fixed plates; and a permanent magnet strip arranged in an arc shape is arranged on theupper surface of the base, the same poles of the permanent magnet strip and the magnet blocks repel each other, a crushing cylinder extending in the axis direction of the rotating cylinder is arranged in the rotating cylinder, and a plurality of ribs are fixedly connected to the side wall of the crushing cylinder. According to the self-falling type efficient concrete mixer, in the stirring process, concrete can fully fall off, stirring is uniform, the effect is good, and the working efficiency is greatly improved.

The invention provides a card making substrate. The invention relates to a preparation method and an IC card or an electronic tag containing the same. wherein the card making substrate comprises an aluminized film layer, a bonding glue layer and a base material layer which are overlapped in sequence, at least one continuous scratch exists on the surface of the aluminized film layer, the depth of the scratch is greater than the thickness of an aluminum film in the aluminized film layer, and the scratch and the edge of the aluminized film layer divide the aluminum film in the aluminized film layer into at least two areas which are mutually connected; According to the invention, at least one continuous scratch is simply added to the surface of the aluminum-plated film layer in a common card-making substrate; The aluminum film is divided into at least two areas which are not connected with each other, so that the non-contact IC card or electronic tag manufactured by the card manufacturingsubstrate has a longer read-write distance, and meanwhile, the appearance effect of the aluminum-plated film with a laser effect is not damaged.

The invention discloses a 220 kV power transmission line using an energy-saving OPGW cable operation mode and relates to the technical field of the high-voltage power transmission line. The 220 kV power transmission line using the energy-saving OPGW cable operation mode comprises a tangent tower and a strain tower, the tower head of each of the tangent tower and strain tower is provided with a ground wire and an OPGW cable, the OPGW cable is insulated from the tangent tower through ground wire insulators in a mode of using tray as a unit, the joints between the cable trays are connected with the ground, the whole OPGW cable is continuous, on one part of the strain tower between each two joints, the positions of the OPGW cable and the ground wire are changed, at the position change part, the OPGW cable is fixed on the tower head through an insulated down-lead clip, and at the transformer substation export, the segment of the ground wire with larger short-circuit current is directly connected with the ground. According to the 220 kV power transmission line, although a loop is formed between the OPGW cable and the ground, the induced current is greatly lowered because of the counteracting of the induced voltage, the electric energy consumption is greatly lowered, the electrical performance difference of a system due to the grounding times of the shunting ground wire and OPGW is reduced, the lightning stroke probability of the OPGW is lowered in a certain degree, the cable running condition is improved, and the initial investment for the OPGW cable of the power transmission line is saved.

The invention relates to the field of electromagnetic compatibility of high-tension transmission and transformation engineering, and specifically relates to a method for reducing passive interference of a high-tension transmission line in a low frequency band. The method focuses on analyzing the resonant frequency of a high-tension overhead line, through changing the grounding mode of the power transmission line, reduces induction currents of the high-tension overhead transmission line in the working frequency band of a radio station, and reduces the passive interference generated by the power transmission line from a source. The method comprises the following steps: (1), determining the resonant frequency of an annular antenna composed of a power transmission line tower and an overhead ground wire; (2), according to the actual arrangement of the power transmission line, determining resonant frequencies of different spans; and (3), according to radio interference frequencies needing to be avoided, detuning the high-tension transmission line through a mode of changing grounding points. According to the invention, through comparing test data obtained through tests, it is proved that the method is quite high in accuracy and can be applied to reduction of the passive interference exerted on an adjacent medium-short wave radio station by the high-tension transmission line in the future.

A system for inductive power transfer that may selectively transmit power in a plurality of modes based on characteristics of a power receiver and determine which transmitter coils to drive based on received signal strength information. The inductive power transfer transmitter may detect characteristics of the power receiver in order to control the mode of the power transfer and selectively control which transmitter coils are driven based on signal strength information received from a power receiver. The power transmitter may have slugs formed of a magnetically permeable material within common coil winding openings and the transmitter coils may consists of a plurality of parallel windings.

The invention belongs to the field of security monitoring, and in particular relates to a self-adjusting security camera based on a reversible reaction principle. The self-adjusting security camera comprises a base fixedly mounted on a building, a camera is mounted at the lower end of the base; a hemispherical inner transparent cover and a hemispherical outer transparent cover are arranged outsidethe camera in a surrounding mode. The outer transparent cover is arranged outside the inner transparent cover in a sleeving manner; the inner transparent cover and the outer transparent cover are both fixedly connected with the base. A plurality of conducting rings of which the diameters are gradually reduced from top to bottom are fixedly arranged between the inner transparent cover and the outer transparent cover; the conducting rings are made of indium tin oxide materials, the space between the inner transparent cover and the outer transparent cover is divided into a plurality of annular light-transmitting cavities by the conducting rings, and the annular light-transmitting cavities are filled with nitrogen dioxide and nitrogen tetroxide mixed gas. The area of a dark area of the annular light-transmitting cavities from top to bottom can be adjusted according to the illumination intensity, so that background illumination is automatically adapted, the visual field is sacrificed as little as possible, and the definition of an image area is improved.

The invention relates to a high-efficiency asynchronous motor capable of changing end ring thickness and reducing starting current. A rotor cage is designed according to standards; a cage end ring at one end of a rotor is divided into two parts in a radial direction, wherein one part is maintained connected with cage strips, and the other part, namely "an additional end ring" is fixed to a centrifuge support of a centrifugal switch; when a motor is started, only the thickness-reduced cage end ring of the rotor cage acts; and when the motor reaches a preset rotation speed, the centrifuge support pushes the "additional end ring" for attaching to the thickness-reduced cage end ring, thereby recovering the thickness of the end ring.

The invention discloses a friction blocking rolling door falling prevention device. The friction blocking rolling door falling prevention device is mainly used for preventing a rolling door from falling and hurting people, is simple in structure and can prevent the rolling door from falling in multiple states, and protection is safe and reliable. The friction blocking rolling door falling prevention device is composed of a pair of blocking devices and a triggering device; according to the operating principle of the friction blocking rolling door falling prevention device, when a door curtain of the rolling door rises and stops, an electromagnet A and an electromagnet B of the blocking devices are synchronously powered off, a spring A and a spring B spring back, elongate and drive the leftand right ends of rhombic connection rods to elongate, and a pair of blocking plates abut against the inner faces of the side walls of door curtain sliding sleeves respectively to prevent the door curtain from falling suddenly; when the door curtain of the rolling door descends, if the door curtain falls suddenly due to a certain reason, the triggering device triggers an electromagnetic switch tooperate to cut off power supplies of the electromagnet A and the electromagnet B of the blocking devices, and the left and right blocking plates abut against the inner surfaces of the side walls of the door curtain sliding sleeves respectively to prevent the door curtain from falling.

The invention discloses a cooling and noise reduction type dry-type transformer comprising a shell, a plurality of air outlet holes are formed in the side wall of the shell, a strip-shaped cavity is formed in the side wall of the shell, the strip-shaped cavity penetrates through the air outlet holes, a sliding plate is connected to the inner wall of the strip-shaped cavity in a sealed and sliding mode, and a plurality of through holes matched with the air outlet holes are formed in the side wall of the sliding plate. The lower end of the sliding plate is elastically connected with the inner bottom of the strip-shaped cavity through a spring, a cavity is formed in the upper end of the shell, a tuning fork is fixedly connected to the inner wall of the cavity, the side wall of the tuning fork is fixedly sleeved with a plurality of permanent magnet blocks, and a spiral coil is embedded in the inner wall of the cavity. The tuning fork resonates due to noise generated by the dry-type transformer, the tuning fork drives the permanent magnet block to move, the spiral coil moves relative to the permanent magnet block and cuts the magnetic induction line, the induced current is generated on the spiral coil, sound energy in the noise is effectively converted into electric energy, and propagation of the noise is reduced.

The invention relates to the technical field of sweeping robot equipment, in particular to a robot for road sweeping. The robot comprises an equipment body, a center shaft is inserted into the equipment body, the outer portion of the rear end of the center shaft is sleeved with a working disc, and a positioning frame is fixedly connected to the position, located in the equipment body, of the outersurface of the center shaft. A cathode magnet is connected to the position, located outside the center shaft, of the interior of the equipment body in a sleeving mode, an anode magnet is fixedly connected to the position, located inside the cathode magnet, of the interior of the equipment body, and a sliding block is fixedly connected to the position, located outside the anode magnet, of the rearsurface of the positioning frame. The road surface is subjected to dust falling treatment through extruded water, and dust is prevented from flying on the road surface when the equipment works, so that people are prevented from inhaling the dust; and generated induction current becomes small, a signal lamp cannot be turned on, workers can be well reminded to handle the situation, a motor of the equipment can be well protected, and long-time overload operation is avoided.

An OTP with ultra-low power read can be programmed with a minimum and a maximum program voltage. When programming within the range, the post-program OTP to pre-program resistance ratio can be larger than N, where N>50, so that more sensing techniques, such as single-end sensing, can be used to reduce read current. At least one of the OTP cells can be coupled to a common bitline, which can be further coupled to a first supply voltage lines via a plurality of datalines. The resistance in the at least one OTP cell can be evaluated by strobing at least one comparator output of the discharging bitline / dataline.

The invention relates to a power transmission line pipeline and a gas insulation line. The power transmission line pipeline comprises three sub-pipelines in insulation connection in order, wherein each sub-pipeline comprises a metal shell and a composite material shell coated on the outside of the metal shell, and two ends of the power transmission line pipeline are grounded; furthermore, the gasinsulation line comprises a plurality of connected pipeline units; each pipeline unit comprises an A-phase pipeline, a B-phase pipeline and a C-phase pipeline; three groups of crossly interconnected electric loops containing A-phase sub-pipelines, B-phase sub-pipelines and C-phase sub-pipelines are formed among three-phase pipelines. The technical effect is as follows: three metal shells in different phases are interconnected and form the electric loops together with the ground, the induced electromotive force produced by the whole electric loop can be basically and mutually counteracted, theinduction current produced in the electric loop can be greatly reduced, the heating phenomenon of the metal shell can be greatly reduced, the power transmission loss is reduced, the safety running ofthe equipment is improved, and the economy of the power transmission system is improved.

The invention belongs to the field of circuit breakers, and particularly relates to a middle-high voltage circuit breaker capable of expelling products between isolation contacts, which comprises a bottom plate, a front cover is fixedly connected to the upper surface of the bottom plate, an adjusting switch is rotationally connected to the inner surface of the front cover, and a cover plate is fixedly connected to the back face of the front cover. According to the middle-high voltage circuit breaker with the product expelling function between the isolation contacts, through the arrangement of a two-stage closing mechanism, when the adjusting switch is toggled, an arc-shaped magnet drives an iron core to move, a vertical rod is driven by an insulating plate to move downwards, a lever pushes a connecting rod upwards, a movable arc-shaped plate is separated from a fixed arc-shaped plate, and a power inlet end of a power outlet wire stops power transmission; as the surface areas of the fixed cambered plate and the movable cambered plate are very large, when the two plates slide relatively, the generation of induced current is reduced by increasing the contact area, and the problem that electric sparks are easily generated due to the induced current when a traditional contact type circuit breaker is opened and closed due to the small contact area of a contact is solved.