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41results about How to "Eliminate mutual inductance" patented technology

Electromagnetic prospecting sending-receiving integration method and device

The invention relates to an electromagnetic prospecting sending-receiving integration method and a device. The invention is suitable for the fields of geophysical prospecting, engineering geological prospecting, underground military target detection, nondestructive inspection and the like. The technical scheme of the invention is as follows: arranging an inner receiving coil 1 in a sending coil 3; arranging an outer receiving coil 2 outside the sending coil 3; ensuring that magnetic flux passing through the inner receiving coil 1 and the outer receiving coil 2 is equivalent and is in opposite sign under the action of primary field; mutually offsetting primary field induced voltage; and only outputting a secondary field signal. The device comprises a transmitter 4, a sending coil 3, an inner receiving coil 1, an outer receiving coil 2, a signal conditioning circuit 5 and a receiver 6, wherein the inner receiving coil 1 is connected with the outer receiving coil 2, and the coil 1 and the coil 2 are connected with the signal conditioning circuit 5. The invention has the advantages of eliminating primary field influence, reducing signal dynamic range, expanding the practicability of small-wireframe same-point device and realizing integration of the sending coil and the receiving coil.
Owner:CHONGQING CUILU DETECTION TECH CO LTD

Cylinder type flux-reversal linear machine

The present invention relates to a cylinder type flux-reversal linear machine. The invention relates to the field of electric machine and settles the problems of low efficiency, large eddy current loss, complex technique and effect to control precision and dynamic characteristic in prior linear machine. The armature core of phase unit according to the nveition is an annular core which is uniformly installed with 2n teeth on the inner circumstance, wherein n is a natural number. The armature winding of phase unit is a concentrated winding. Each coil is corresponding winded on each tooth of armature core of phase unit. The winding directions of coils on adjacent teeth are opposite. All coils on the teeth of armature core of same phase unit are connected in series to a same phase unit armature winding. The phase unit armature windings are connected in series or in parallel to each phase armature winding. A permanent magnet is adhibited on the teeth of armature core of phase unit. The phase unit armature core center distance taut between two adjacent phase armature units in axial direction and the tooth pitch taup of secondary teeth along the axial direction satisfy a relationship: taut=ktaup+ / -(1 / m)taup, wherein k and m are natural numbers, and m is a phase number and is larger than or equal to 3. The cylinder type flux-reversal linear machine not only can be used as a motor, but also can be used as a generator.
Owner:HARBIN INST OF TECH

Cylinder type flux-reversal linear machine

The present invention relates to a cylinder type flux-reversal linear machine. The invention relates to the field of electric machine and settles the problems of low efficiency, large eddy current loss, complex technique and effect to control precision and dynamic characteristic in prior linear machine. The armature core of phase unit according to the invention is an annular core which is uniformly installed with 2n teeth on the inner circumstance, wherein n is a natural number. The armature winding of phase unit is a concentrated winding. Each coil is corresponding winded on each tooth of armature core of phase unit. The winding directions of coils on adjacent teeth are opposite. All coils on the teeth of armature core of same phase unit are connected in series to a same phase unit armature winding. The phase unit armature windings are connected in series or in parallel to each phase armature winding. A permanent magnet is adhibited on the teeth of armature core of phase unit. The phase unit armature core center distance taut between two adjacent phase armature units in axial direction and the tooth pitch taup of secondary teeth along the axial direction satisfy a relationship: taut=ktaup+ / -(1 / m)taup, wherein k and m are natural numbers, and m is a phase number and is larger than or equal to 3. The cylinder type flux-reversal linear machine not only can be used as a motor, but also can be used as a generator.
Owner:HARBIN INST OF TECH

Transient electromagnetic detection apparatus and method of eliminating inductive disturbance

PendingCN108008451AEnhanced magnetic field radiationReduced mutual inductanceElectric/magnetic detectionAcoustic wave reradiationEngineeringInductance
The invention provides a transient electromagnetic detection apparatus and a method of eliminating inductive disturbance. The transient electromagnetic detection apparatus includes a coil device and aframework carrier, wherein the coil device includes dual transmission coils, receiving coils and a coil fixing mount; the dual transmission coils include first and second transmission coils which areparallel to each other, are not in the same plane and can generate counter magnetic fields at the center of the respective coil at any power-on moment; the receiving coils are arranged between the dual transmission coils, and for the distance, the constraint is that earlier signals are not beyond the amplitude; a rotation shaft which is parallel to the dual transmission coils and can drive the coil device to overturn is arranged on the coil fixing mount; and a nonmetal handle is arranged on the rotation shaft. The method of eliminating inductive disturbance measures the signals before and after 180DEG overturning of the coil device at the same position point and performs difference processing, by enabling the transmission coils in the detection apparatus to approach the area to be detected and enabling the normal of the transmission coils to be perpendicular to the area to be detected. The method of eliminating inductive disturbance enables earlier signals not to be beyond amplitude,and can capture whole course secondary field signals by eliminating inductive disturbance and enhance the distinguishing result.
Owner:ANHUI HUIZHOU GEOLOGY SECURITY INST

Transverse flux permanent-magnet planar motor

The invention discloses a transverse flux permanent-magnet planar motor, and relates to the filed of motors. The transverse flux permanent-magnet planar motor solves the problems of limited stroke of a rotor, low thrust density, complicated structure of the motor, low current control accuracy and the like in the conventional permanent-magnet planar motor. The primary of the motor consists of a plurality of motor units; each w motor units consist of m2 phase armature units; and the m2 phase armature units form a phase armature unit array; the intervals between rows and the intervals between columns are the same; each phase armature unit consists of a phase unit iron core and a phase unit winding; each phase unit iron core with perforations consists of two iron core units, the perforations are formed by overlapping tooth spaces of the two iron core units, two teeth of each iron core unit are arranged along the horizontal direction of a cross section, and a magnet yoke section is connected between the two teeth; a coil is wound into a phase of phase unit winding through the perforations; and the tooth pitch tau a between two adjacent phase unit iron cores along the X direction or Y direction is equal to [1+j / m]] tau p. In addition, the motor has the advantages of simple structure and easy realization of modulization, and the stroke of the motor is not limited.
Owner:HARBIN INST OF TECH

Voltage amplitude and phase angle measuring method for double-circuit line non-same-name-phase overline grounded fault point

The invention discloses a voltage amplitude and phase angle measuring method for a double-circuit line non-same-name-phase overline grounded fault point. The method includes the steps that the fault phase voltage, the fault phase current and the zero-sequence current of a protecting and installing position of a circuit line I of a double-circuit line on the same tower are firstly measured; the phase angle of the zero-sequence current of a circuit line II of the double-circuit line on the same tower is calculated, and the zero-sequence current of the circuit line II of the double-circuit line on the same tower is calculated; the voltage amplitude of the double-circuit line non-same-name-phase overline grounded fault point is calculated. Only single-end single-circuit line electric amount is used without introducing the electric amount of the other circuit line, and measurement results are not affected by changes of operation modes of the electric power system. Influence on accuracy of measuring the voltage amplitude of the double-circuit line non-same-name-phase overline grounded fault point by zero-sequence mutual inductance between the lines, transition resistance and a load current is eliminated, and the measuring method is high in measurement accuracy.
Owner:STATE GRID CORP OF CHINA +2

Transverse Flux Multiphase Reluctance Motor

The invention discloses a transverse magnetic flux multi-phase reluctance motor, and relates to a reluctance motor, which solves the problem that magnetic coupling is existed between phases in a traditional multi-phase permanent magnet synchronous motor to affect the control precision of current. The reluctance motor consists of a stator and a rotor, wherein m phase armature units are arranged inan enclosure along an axial direction in sequence, and each phase armature unit is staggered in a 360 DEG / m electrical angle along a circumference direction in sequence; an armature coil is embedded in an annular space formed among first to third circular iron core sections; permanent magnets are fixedly arranged on the internal surfaces of the first and the third circular iron core sections along the circumference direction with alternated N-pole and S-pole in sequence; and a pole distance taum between every adjacent two permanent magnets and a tooth space taup of rotor teeth arranged along the circumference direction satisfy the formula of 2taum=taup. The reluctance motor disclosed by the invention eliminates the alternating mutual inductance, improves control accuracies of motor current and electromagnetic torque and dynamic property of ta system; and improves the reliability and the safety of the motor since the permanent magnets are located above the stator.
Owner:HARBIN INST OF TECH

Wireless charging coil assembly and electric energy transmission system adopting assembly

The invention provides a wireless charging coil assembly. The wireless charging coil assembly comprises a first wireless charging coil unit and a second wireless charging coil unit, wherein the first wireless charging coil unit comprises a primary side main coil and a primary side secondary coil; the primary side secondary coil and the primary side main coil are connected in series; the second wireless charging coil unit comprises a secondary side main coil and a secondary side secondary coil; the secondary side secondary coil and the secondary side main coil are connected in series; and the first wireless charging coil unit and the second wireless charging coil unit are symmetrically arranged. Compared with the prior art, the wireless charging coil assembly has the following advantages: the primary side main coil and the secondary side main coil adopt a serial dual-rectangular structure having a shape as shown in the specification, so that the transmission efficiency of the coils is effectively improved; the primary side secondary coil and the secondary side secondary coil adopt a serial dual-rectangular structure having a shape as shown in the specification; and therefore, when the coils are used in a multi-inductor resonant circuit, mutual influence between a main inductor and a secondary inductor can be avoided under a condition that the integration degree of the coils is improved.
Owner:SHANGHAI JIAO TONG UNIV

Inter-phase electromagnetic decoupling flat permanent magnet synchronous straight line motor

The invention provides an inter-phase electromagnetic decoupling flat permanent magnet synchronous straight line motor, which relates to the motor field and solves the problems that: the magnetic coupling existed between the phases influences the control precision of the current, and a magnetic path passed by a magnetic flux generated by each phase of winding is too long to cause a large consumption of the stator iron. The primary grade of the inter-phase electromagnetic decoupling flat permanent magnet synchronous straight line motor comprises phase units, wherein each phase unit comprises phase unit iron cores and phase unit windings; each phase unit iron core composes the phase unit iron core including tooth holes with 2k iron core units; the tooth holes are formed by superposing tooth grooves; each iron core unit is composed of two teeth and a magnetic yoke section; the two teeth are arranged along a horizontal direction of the cross section; the magnetic yoke section is connected between the two teeth; the 2k iron core units are arranged in a shell at interval along a moving direction; coils are wound into the phase unit winding through the tooth holes; when the motor is the m-phase motor, im phase units are existed therein; a centre distance L between two adjacent phase unit iron cores is L=[(j-1)+1 / m]tp. The inter-phase electromagnetic decoupling flat permanent magnet synchronous straight line motor is used as the motor or a generator.
Owner:HARBIN INST OF TECH

Magnetic field modulation type flat plate type transverse flux linear motor

A magnetic field modulation type flat plate type transverse flux linear motor belongs to the technical field of motors and solves the problem of low thrust intensity of an existing unilateral flat plate type permanent magnet linear synchronous motor. The magnetic field modulation type flat plate type transverse flux linear motor comprises a primary and a secondary, air gaps are arranged between the primary and the secondary, the primary comprises a plurality of phase primary units, each of the phase primary units is composed of a unit primary iron core and a unit primary winding, each unit primary iron core is composed of a plurality of unit primary iron core teeth and a plurality of magnetic partition boards, and the secondary comprises a secondary iron core and a plurality of secondary permanent magnets. The magnetic field modulation type flat plate type transverse flux linear motor improves the thrust intensity, reliability and safety of the motor, eliminates interphase mutual inductance, and enhances control accuracy and dynamical characteristics of current and electromagnetic force of the motor.
Owner:HARBIN INST OF TECH

Asymmetrical bipolar coil which can be used in modular wireless power transmission system

The invention discloses an asymmetrical bipolar coil which can be used in a modular wireless power transmission system. The coil is first wound clockwise or counterclockwise from inside to outside orfrom outside to inside to form a rectangle and then wound in the opposite direction from outside to inside or from inside to outside to form another rectangle. Finally, a double-rectangle structure with left and right rectangles is formed, and the left and right sides of the coil are in an asymmetrical form. The asymmetrical form includes at least one case as follows: (1) the left and right sidesof the coil are asymmetric in shape; (2) the left and right sides of the coil are asymmetric in number of turns; and (3) the left and right sides of the coil are asymmetric in line spacing. By adopting the asymmetrical bipolar coil of the invention, the mutual inductance between coils on the same side can be eliminated, which is of great significance to the improvement of the transmission efficiency of the system and the reduction of the control difficulty of the system and is conducive to the development of the modular wireless power transmission system.
Owner:ZHEJIANG UNIV

Air core coil mutual inductance coefficient error elimination method and application based on rotation cancellation principle

The invention discloses an air core coil mutual inductance coefficient error elimination method and application based on a rotation cancellation principle. The method comprises steps of enabling a rotating disc to rotate by 360 DEG / n relative to a current carrying lead, measuring a voltage of an air core coil, rotating the rotating disc by the same degree and measuring a voltage, and performing n times of rotation; obtaining mutual inductance coefficients according to voltage and current values; and performing weighted average of the mutual inductance coefficients to obtain the accurate mutual inductance coefficient value of the air core coil. The invention discloses an air core coil current measurement method. The air core coil mutual inductance coefficient error elimination method is used for obtaining the mutual inductance coefficient, the rotating disc is rotated at the same degree by many times to obtain multiple groups of voltages of the air core coil, currents are obtained according to the mutual inductance coefficients and the voltages, and the accurate value of a tested current is obtained by weighted average of the multiple groups of currents. Under a precondition that factors of the air core coil symmetry, the current carrying lead cross section, the tested current central position and the like are unknown, the instability of the mutual inductance coefficient is reduced, influences on currents can be eliminated, and the measurement accuracy of the air core coil is improved.
Owner:HUAZHONG UNIV OF SCI & TECH

Permanent magnet synchronous motor with interphase uncoupled structure

The invention discloses a permanent magnet synchronous motor with an interphase uncoupled structure, relating to the field of motors and solving the problem that the control precision of current is influenced because magnetic coupling exists between phases and the defect that stator iron loss is larger because a magnetic circuit passed by magnetic flow generated by electrifying each group of windings is longer. The phase unit of a stator comprises a plurality of phase armature iron cores and a plurality of phase armature windings, wherein each phase armature iron core comprises 2k iron core units; each phase armature iron core is a phase armature iron core with comprises 2k iron core units and has a tooth hole; the tooth hole is formed by superposing tooth slots; the two teeth of each iron core unit are arranged along the axial direction; a magnet yoke section is connected between the two teeth; 2k iron core units are sequentially arranged in a housing case at equal intervals along the peripheral direction; and coils are wounded into single-phase armature windings by tooth holes. The motor has im phase units when being an m-phase motor, and the included angle between the axes of two adjacent phase armature windings is an electrical angle of [(j-1)+(1 / m)]*180 degrees. The permanent magnet synchronous motor not only can be used as an electromotor but also can be used as a generator.
Owner:HARBIN INST OF TECH

Superconductive controllable reactor

InactiveCN102623158AAdjust the inductance valueStable inductance valueTransformersTransformers/inductances coils/windings/connectionsOvervoltagePower grid
The invention discloses a superconductive controllable reactor, which comprises a first segmented magnetic yoke, a second segmented magnetic yoke, a working coil, a superconductive excitation coil group and a low-temperature dewar, wherein the first segmented magnetic yoke is an iron core; the second segmented magnetic yoke comprises an excitation iron core group and two same cambered iron cores; the excitation iron core group consists of a plurality of excitation iron cores which are distributed and clamped in the two cambered iron cores of the second segmented magnetic yoke at equal radians; each excitation iron core is sleeved on each superconductive excitation coil; the inductance values of the superconductive excitation coils are the same, and the superconductive excitation coil group is formed by connecting the superconductive excitation coils in series; the two adjacent superconductive excitation coils are sequentially connected with one another according to homonymy terminals and synonym terminals; the number of the superconductive excitation coils and the number of the excitation iron cores are the same and even; and the superconductive excitation coils and the excitation iron cores are arranged in the non-magnetic low-temperature dewar. The superconductive controllable reactor can continuously and adjustably compensate the reactive power of a power grid in a large scale, so that reactive power balance is realized, the stability of a power transmission system is improved, the power transmission capacity is improved, and system overvoltage is suppressed.
Owner:HUAZHONG UNIV OF SCI & TECH +1

Real-time forecasting method and warning system for water disaster in front of excavation roadway

InactiveCN104267441AConvenient underground installationEliminate Coil Mutual InductanceElectric/magnetic detection for well-loggingMining devicesMulti fieldWave field
The invention discloses a real-time forecasting method and a warning system, wherein an electromagnetic wave field and a temperature field are used for monitoring a water disaster in front of an excavation roadway in a combined mode. The system comprises an explosion-proof main machine 10, an electromagnetic wave emitting coil 1, an electromagnetic wave receiving coil 2 and a thermal infrared temperature sensor probe 4. According to the method, the electromagnetic wave filed and a thermal infrared field are used as signal sources for conducting real-time collection and recording on wave field signals, primary results are obtained after the wave field signals are subject to data processing, a multi-field multi-parameter information fusion judging system is used for conducting fusion, correlation and comprehensive analysis on the processing results of the two kinds of wave field signals, grading and forecasting of water-containing geologic bodies are completed, and according to a set threshold, an intelligent voice alarm conducts alarming on the water-containing geologic bodies reaching the danger level. The real-time forecasting method and the warning system overcome the defect that in the prior art, real-time forecasting cannot be conducted on the water disaster in front of the excavation roadway, fully utilize the advantages of the different physical fields, improve the real-time monitoring and forecasting precision, achieve the purposes of full-process monitoring, and realize real-time forecasting and alarming of the water disaster in front of the excavation roadway.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)

Transverse magnetic flux linear reluctance motor with offset permanent magnet

The invention provides a transverse magnetic flux linear reluctance motor with an offset permanent magnet and belongs to the technical field of motors, and the transverse magnetic flux linear reluctance motor provided by the invention can be used for solving the problems that a permanent magnet is arranged at the secondary pole of the existing unilateral flat-plate-type linear permanent magnet synchronous motor, so that the motor cost is high and the reliability and safety are reduced. According to the five technical schemes provided by the invention, the motor comprises a primary pole and the secondary pole, wherein an air gap is reserved between the primary pole and the secondary pole; the primary pole comprises multiple phase armature units, each phase armature unit consists of an armature core, a phase unit armature winding and a phase unit permanent magnet; all coils on the armature core of each phase armature unit are connected in series to form one phase unit armature winding; and multiple phase unit armature windings are connected in series or in parallel to form a motor armature winding. According to the invention, the mode that the permanent magnet is arranged at the secondary pole of the existing linear permanent magnet synchronous motor is omitted, thus the motor cost is lowered, and the reliability and safety are improved.
Owner:HARBIN INST OF TECH

Lateral logger

A lateral logger comprises an electronic instrument circuit sub, a 64-core connector, a pre-amplifier circuit sub, a dual-induction coil system, an 8-lateral electrode, a pressure balance bag and a battery. The lateral logger has the advantages that received signals are enhanced, signal-to-noise ratio is increased, power consumption of the logger is reduced, temperature performance, sensitivity, stability and measurement accuracy of the logger are improved greatly, and the lateral logger is suitable for data measurement in detection of formation conductivity of open hole wells.
Owner:SHAANXI HI-TECH IND CO LTD

Three-phase separation stator yoke-free modularized axial magnetic flux permanent magnet disc type wheel hub direct-driven motor

The invention discloses a three-phase separation stator yoke-free modularized axial magnetic flux permanent magnet disc type wheel hub direct-driven motor, and belongs to the field of brushless direct-current motors. The problem of an existing wheel hub motor is solved. The three-phase separation stator yoke-free modularized axial magnetic flux permanent magnet disc type wheel hub direct-driven motor comprises an outer rotor, an inner stator and a fixed shaft, wherein three groups of stator supports of the inner stator are arranged on the fixed shaft in parallel; 2p iron core mounting holes are uniformly formed in the stator support in the circumferential direction and are used for mounting a stator iron core module which enwinds a stator winding 5; a rotor support of the outer rotor is provided with a rotor connecting outer tube and four circular ring rotor back irons, so that three annular chamber areas are formed; a group of stator supports is accommodated in each of the annular chamber areas; 4p permanent magnets are uniformly arranged on the two inner end faces of each of the annular areas; the permanent magnets are magnetized in the axial direction, the magnetized directionsof the two adjacent permanent magnets on the same end face are opposite to each other, and the magnetized directions of the permanent magnets which are arranged in the same annular chamber and positioned on the two end faces are opposite, and the permanent magnets of the three annular chambers are distributed sequentially at different electrical angles of 120 degrees in the circumferential directions.
Owner:HARBIN UNIV OF SCI & TECH

Electromagnetic prospecting sending-receiving integration method and device

The invention relates to an electromagnetic prospecting sending-receiving integration method and a device. The invention is suitable for the fields of geophysical prospecting, engineering geological prospecting, underground military target detection, nondestructive inspection and the like. The technical scheme of the invention is as follows: arranging an inner receiving coil (1) in a sending coil (3); arranging an outer receiving coil (2) outside the sending coil (3); ensuring that magnetic flux passing through the inner receiving coil (1) and the outer receiving coil (2) is equivalent and is in opposite sign under the action of primary field; mutually offsetting primary field induced voltage; and only outputting a secondary field signal. The device comprises a transmitter (4), a sending coil (3), an inner receiving coil (1), an outer receiving coil (2), a signal conditioning circuit (5) and a receiver (6), wherein the inner receiving coil (1) is connected with the outer receiving coil (2), and the coil (1) and the coil (2) are connected with the signal conditioning circuit (5). The invention has the advantages of eliminating primary field influence, reducing signal dynamic range, expanding the practicability of small-wire frame same-point device and realizing integration of the sending coil and the receiving coil.
Owner:CHONGQING CUILU DETECTION TECH CO LTD

Modularized wireless charging system for realizing decoupling of double rows of same-side coils

The invention discloses a modularized wireless charging system for realizing decoupling of double rows of same-side coils. The modularized wireless charging system comprises more than two power transmitters or power receivers, and is characterized in that each power transmitter comprises a driving power supply, a transmitting compensation network and a transmitting coil, the power receiver comprises a receiving coil, a receiving compensation network and a rectifier, the receiving coils or the transmitting coils are placed in a double-row mode, and each receiving coil and / or transmitting coil is correspondingly connected with one or two multi-winding decouplers, so that mutual inductance influence between the receiving coils or the transmitting coils on the same side is eliminated, and decoupling of the receiving coils and / or the transmitting coils is achieved. According to the invention, the modularized wireless charging system can be used for eliminating the mutual inductance influence between the same-side coils, so that the modularized wireless charging system has important significance in improving the transmission efficiency of the modularized wireless charging system and reducing the control difficulty of the system.
Owner:ZHEJIANG UNIV

Method and Application of Air-core Coil Mutual Inductance Coefficient Error Elimination Based on Rotating Cancellation Principle

The invention discloses an air core coil mutual inductance coefficient error elimination method and application based on a rotation cancellation principle. The method comprises steps of enabling a rotating disc to rotate by 360 DEG / n relative to a current carrying lead, measuring a voltage of an air core coil, rotating the rotating disc by the same degree and measuring a voltage, and performing n times of rotation; obtaining mutual inductance coefficients according to voltage and current values; and performing weighted average of the mutual inductance coefficients to obtain the accurate mutual inductance coefficient value of the air core coil. The invention discloses an air core coil current measurement method. The air core coil mutual inductance coefficient error elimination method is used for obtaining the mutual inductance coefficient, the rotating disc is rotated at the same degree by many times to obtain multiple groups of voltages of the air core coil, currents are obtained according to the mutual inductance coefficients and the voltages, and the accurate value of a tested current is obtained by weighted average of the multiple groups of currents. Under a precondition that factors of the air core coil symmetry, the current carrying lead cross section, the tested current central position and the like are unknown, the instability of the mutual inductance coefficient is reduced, influences on currents can be eliminated, and the measurement accuracy of the air core coil is improved.
Owner:HUAZHONG UNIV OF SCI & TECH

Mask type coil device for magnetic resonance imaging of facial tissues and implants of human body

The invention discloses a mask type coil device for magnetic resonance imaging of human face tissues and implants, which comprises a soft shell arranged outside a coil body, and the soft shell comprises an upper panel and a lower panel which are the same in material, structure and shape; the upper panel is formed by flexibly bonding six polyimide curved panels through polyurethane rubber, and the six curved panels cover the forehead part, the nose part, the cheek part, the cheek part, the periphery of the lip part and the lower jaw part respectively; nose and eye through holes are formed in the curved plate; the edges of the upper panel and the lower panel are correspondingly connected; the coil body comprises 24 annular coils, and all the coils comprise overlapped parts; the peripheral contour of all the arranged coils is basically consistent with the contour of the soft shell, and the coil body is connected to a magnetic resonance host interface through an external interface board and a radio frequency wire harness. According to the invention, the coil body fits the face of a wearer, and the obtained magnetic resonance imaging has better signal-to-noise ratio and higher image quality.
Owner:THE SECOND HOSPITAL OF TIANJIN MEDICAL UNIV

Transverse flux cylinder type permanent magnet linear synchronous motor

A transverse flux cylinder type permanent magnet linear synchronous motor relates to the field of motor, and settles the problems of low efficiency, large eddy current loss, complex technique and effect to the control precision and dynamic characteristic. The transverse flux cylinder type permanent magnet linear synchronous motor of the invention comprises a primary stage, a secondary stage and anair gap. The number of phase armature units is S=nm, wherein n is a natural number. The number of axial magnetic poles formed by secondary permanent magnets is P=2i, wherein is a natural number. When no common divisor exists between S and P, the S phase armature units are equally divided to m groups along the axial direction, and each n adjacent phase armature units belong to one phase. When a highest common divisor j exists between S and P, the S phase armature units are equally divided into mj parts along the axial direction, and windings on each adjacent n / j phase armature units belong toone phase. The phase unit armature core tooth pitch taut between two adjacent phase armature units along the axial direction and the pole distance taup along the axial permanent magnet satisfies a relationship mktaut=(mk+ / -1)taup, wherein m and k are natural numbers, and m is the phase number of motor. The motor not only can be used as an electric motor, but also can be used as a generator.
Owner:HARBIN INST OF TECH

Superconductive controllable reactor

InactiveCN102623158BAdjust the inductance valueStable inductance valueTransformersTransformers/inductances coils/windings/connectionsOvervoltagePower grid
The invention discloses a superconductive controllable reactor, which comprises a first segmented magnetic yoke, a second segmented magnetic yoke, a working coil, a superconductive excitation coil group and a low-temperature dewar, wherein the first segmented magnetic yoke is an iron core; the second segmented magnetic yoke comprises an excitation iron core group and two same cambered iron cores; the excitation iron core group consists of a plurality of excitation iron cores which are distributed and clamped in the two cambered iron cores of the second segmented magnetic yoke at equal radians; each excitation iron core is sleeved on each superconductive excitation coil; the inductance values of the superconductive excitation coils are the same, and the superconductive excitation coil group is formed by connecting the superconductive excitation coils in series; the two adjacent superconductive excitation coils are sequentially connected with one another according to homonymy terminals and synonym terminals; the number of the superconductive excitation coils and the number of the excitation iron cores are the same and even; and the superconductive excitation coils and the excitation iron cores are arranged in the non-magnetic low-temperature dewar. The superconductive controllable reactor can continuously and adjustably compensate the reactive power of a power grid in a large scale, so that reactive power balance is realized, the stability of a power transmission system is improved, the power transmission capacity is improved, and system overvoltage is suppressed.
Owner:HUAZHONG UNIV OF SCI & TECH +1

Measurement method of voltage amplitude and phase angle at non-identical phase-cross-line grounding fault point of double-circuit line

The invention discloses a voltage amplitude and phase angle measuring method for a double-circuit line non-same-name-phase overline grounded fault point. The method includes the steps that the fault phase voltage, the fault phase current and the zero-sequence current of a protecting and installing position of a circuit line I of a double-circuit line on the same tower are firstly measured; the phase angle of the zero-sequence current of a circuit line II of the double-circuit line on the same tower is calculated, and the zero-sequence current of the circuit line II of the double-circuit line on the same tower is calculated; the voltage amplitude of the double-circuit line non-same-name-phase overline grounded fault point is calculated. Only single-end single-circuit line electric amount is used without introducing the electric amount of the other circuit line, and measurement results are not affected by changes of operation modes of the electric power system. Influence on accuracy of measuring the voltage amplitude of the double-circuit line non-same-name-phase overline grounded fault point by zero-sequence mutual inductance between the lines, transition resistance and a load current is eliminated, and the measuring method is high in measurement accuracy.
Owner:STATE GRID CORP OF CHINA +2

Transient electromagnetic measurement device and method and transient electromagnetic measurement airplane

The invention relates to a transient electromagnetic measurement device and method and a transient electromagnetic measurement airplane. By using a V-shaped planar transmitting antenna with a first included angle, a primary field excited by the transmitting antenna is more beneficial to detection of an upright plate-shaped structure compared with a horizontal primary field excited by traditional transient electromagnetic measurement; moreover, a receiving antenna is arranged on an included angle bisector of the included angle of the transmitting antenna, and the transmitting antenna is used for dividing the receiving antenna into a first part located above the transmitting antenna and a second part located below the transmitting antenna; a magnetic flux of the first part of the receiving antenna and a magnetic flux of the second part of the receiving antenna are equal in size and opposite in direction, so that a total magnetic flux of a primary field of the receiving antenna is zero, mutual inductance between the transmitting antenna and the receiving antenna is effectively removed, and the influence of the primary field on receiving signals of the receiving antenna is eliminated;and the accuracy of a transient electromagnetic measurement result is improved.
Owner:GUANGDONG KENUO SURVEYING ENG CO LTD
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