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351 results about "Phase number" patented technology
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Multiphase power regulator with load adaptive phase control
ActiveUS20070013350A1Maximize efficiencyImprove efficiencyDc-dc conversionAc network voltage adjustmentEngineeringActive phase
Disclosed is a power regulator for providing precisely regulated power to a microelectronic device such as a microprocessor. Improved power regulation is accomplished by optimizing the power efficiency of the power regulator. In particular, in a multiphase system, the number of active phases is increased or decreased to achieve optimum power efficiency. The multiphase voltage regulator adapts the operating mode to maximize efficiency as the load current demand of the load device changes by adjusting the number of active phases to maximize efficiency. The total value of current provided by the regulator and the total number of active phases is determined, the total number of active phases is compared with the number of active phases required to provide the total value of current at maximum efficiency; and the number of active phases is adjusted to provide the total value of current at maximum efficiency. A current sense circuit senses the current at each phase, a summing circuit coupled to the output of the current sense circuit provides the total current value of all the measured phases, a circuit coupled to the output of the summing circuit provides the time averaged total current value to a threshold detecting circuit that determines the number of phases at which the voltage regulator should be operating for maximum efficiency, and a circuit for comparing the number of phases that are operating to the number of phases at which the voltage regulator should be operating adjusts the number of active phases to the number of phases at which the voltage regulator should be operating for maximum efficiency.
Owner:INFINEON TECH AUSTRIA AG
Attack-oriented network security situation prediction method, device and system
ActiveCN108494810ARealize dynamic associationIn line with the actual environmentData switching networksSecuring communicationCountermeasureAttack graph
The invention belongs to the technical field of network security and particularly relates to an attack-oriented network security situation prediction method, device and system. The method comprises the following steps: detecting and collecting alarm data and network environment operation and maintenance information in a network countermeasure environment, obtaining an element set required by network security situation prediction, wherein the element set comprises three types of information of an attacker, a defense party and a network environment; evaluating the attacker capability and the level of the defense party, establishing a dynamic Bayesian attack graph, and calculating an attack phase number and an attack state occurrence probability vector; and combining a vulnerability scoring standard and network asset information, and performing time-space dimension quantification on the network security situation value. According to the method, dynamic association of the situation elements of the defense party, the attacker, the environment information and the like is achieved, the actual environment of the network is better conformed to, the future situation and the attack occurrencetime can be accurately predicted, higher prediction efficiency is achieved, and storage scale and timeliness of network security situation awareness are optimized, so as to provide more effective guidance for network protection.
Owner:PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU
Two-step ripple-free multi-phase buck converter and method thereof
InactiveUS6839252B2Improve conversion efficiencyApparatus without intermediate ac conversionDc source parallel operationMOSFETBuck converter
A two-step ripple-free multi-phase buck converter and method thereof comprises a first-stage voltage regulator to convert an input voltage to an intermediate voltage and a second-stage voltage regulator with a phase number not less than two to further convert the intermediate voltage to an output voltage by a split phase control, in which the ratio of the intermediate voltage to the output voltage is intended to the phase number such that the steady state output current of the converter approaches to be ripple-free, and hence the drivers and MOSFETs for the second-stage voltage regulator are lower cost, the efficiency of the second-stage voltage regulator is improved, and a higher slew rate current is obtained for transient driving capabilities.
Owner:RICHTEK TECH
Semiconductor device and power source device
ActiveUS20110169471A1Improve power conversion efficiencyRange of fluctuation of consumptionDc-dc conversionSolid-state devicesAutomatic controlPhase number
A multi-phase power source device capable of easily changing the number of phases is realized. For example, a plurality of drive units POL[1]-POL[4] corresponding to the number of phases are provided, wherein each POL[n] receives a phase input signal PHI[n] serving as a pulse signal, and generates a phase output signal PHO[n] by delaying PHI[n] by a predetermined cycles of a clock signal CLK. PHI[n] and PHO[n] of each POL[n] are coupled in a ring, wherein each POL[n] performs a switching operation with PHI[n] or PHO[n] as a starting point. In this case, each POL[n] charges and discharges a capacitor Cct commonly coupled to each POL[n] with an equal current, and a frequency of CLK is determined based on this charge and discharge rate. That is, if the number of phases increases n times, the frequency of CLK will be automatically controlled to n times.
Owner:RENESAS ELECTRONICS CORP
Multiphase power regulator with load adaptive phase control
ActiveUS7492134B2Maximize efficiencyImprove efficiencyDc-dc conversionAc network voltage adjustmentEngineeringActive phase
Owner:INFINEON TECH AUSTRIA AG
Multiphase power regulator with load adaptive phase control
ActiveUS20090224731A1Maximize efficiencyImprove efficiencyDc-dc conversionAc network voltage adjustmentActive phaseEngineering
Disclosed is a power regulator for providing precisely regulated power to a microelectronic device such as a microprocessor. Improved power regulation is accomplished by optimizing the power efficiency of the power regulator. In particular, in a multiphase system, the number of active phases is increased or decreased to achieve optimum power efficiency. The multiphase voltage regulator adapts the operating mode to maximize efficiency as the load current demand of the load device changes by adjusting the number of active phases to maximize efficiency. The total value of current provided by the regulator and the total number of active phases is determined, the total number of active phases is compared with the number of active phases required to provide the total value of current at maximum efficiency; and the number of active phases is adjusted to provide the total value of current at maximum efficiency.A current sense circuit senses the current at each phase, a summing circuit coupled to the output of the current sense circuit provides the total current value of all the measured phases, a circuit coupled to the output of the summing circuit provides the time averaged total current value to a threshold detecting circuit that determines the number of phases at which the voltage regulator should be operating for maximum efficiency, and a circuit for comparing the number of phases that are operating to the number of phases at which the voltage regulator should be operating adjusts the number of active phases to the number of phases at which the voltage regulator should be operating for maximum efficiency.
Owner:INFINEON TECH AUSTRIA AG
Multi-phase switching regulator and driver circuit and control method thereof
The present invention discloses a multi-phase switching regulator, a driver circuit of a multi-phase switching regulator, and a control method of a multi-phase switching regulator. The multi-phase switching regulator includes: at least two power stages, switching power transistors in the power stages to convert an input voltage to an output voltage according to pulse width modulation (PWM) signals generated by corresponding PWM controllers respectively; and a current balance circuit, generating a current balance signal according to the current of the corresponding power stage and a phase adjustment signal to averagely distribute current over the active power stages. In the present invention, the gain of the current balance circuit is adjustable, to avoid or reduce output voltage overshoot and undershoot when the phase number changes, while the current balance function is still achieved in normal operation.
Owner:RICHTEK TECH
Complementary type modularization permanent-magnetism linear motor and motor die set formed by same
InactiveCN101860174AAvoid large reluctanceHigh flux densityPropulsion systemsNon magneticConductor Coil
The invention provides a complementary type modularization permanent-magnetism linear motor and a motor die set formed by the same. The permanent-magnetism linear motor comprises a stator and a runner. The stator and the runner are both in a salient pole structure, and an air gap exists between the stator and the runner. The runner comprises 2m E-type modules, wherein m is the phase number of the motor. A non-magnetic material is filled between the two adjacent E-type modules. Each E-type module comprises 2 U-type magnetic teeth and a permanent magnet arranged between the U-type magnetic teeth, wherein concentrated windings are arranged in the grooves of the E-type modules and sleeve the permanent magnets. The relative displacement between the two in-phase E-type modules is lambda 1=(n+ / -1 / 2) Tau s, the relative displacement between the two out-of-phase E type modules is lambda 2=(j+ / -1 / m) Tau s, Tau s is the polar distance of the stator, and n and j are both positive integers. Each phase of windings of the motor has symmetrical complementarity, and the counter potential of the motor has symmetrical waveform and is a sine. Moreover, the complementarity of the structure is greatly lowered, and even the positioning force of the motor is counteracted.
Owner:HAIAN KINGLORD PHOTOELECTRIC CO LTD +1
Assembled scheme for brushless DC motor slot number and magnetic steel number
InactiveCN101030721AMagnetic circuit stationary partsWindings conductor shape/form/constructionMagnetic polesCopper
The invention is concerned with combination project for slot number of the non-brush direct current machine and the alnico number, the characteristic is: the slot number of the stator iron core is equal to the phase number multiply the prime number K that is smaller that the phase number of the electronic machine; alnico pole number of the rotor is equal to the slot number add the prime number that is not equal to 1 and phase number and smaller than K. the invention is: forms several closing magnetic circuit between the teeth in the electrify magnetic pole, which is not only increase the magnetic circuit conducting area effectively and short the magnetic circuit timely, but also reduce the loss of iron and copper.
Owner:苏州扬名机电有限公司 +1
Wound rotor brushless double fed motor
ActiveCN101510702AFlexible change of spanSuppresses higher harmonicsAsynchronous induction motorsWindings conductor shape/form/constructionHarmonicAlternating current
The invention discloses a brushless doubly-fed motor of a wound rotor, pertaining to the technical field of motors. In an AC (alternating current) brushless doubly-fed motor of the invention, two sets of three-phase windings with respective numbers of pole pairs as P1 and p2 are arranged on a stator; a rotor adopts a multi-phase winding and a phase number m meets the relational expression: m= (P1 + p2) / mk, wherein, when P1+ p2 is an odd number, mk is equal to 1; when P1 + p2 is an even number, and mk is equal to 2 and rotor slots are uniformly distributed along the circumference of an air gap. Number of rotor slots Z' meets the relational expression: Z'=n (P1 + p2), wherein, n is a positive number; coils of rotor winding are multi-turn structures; the coil number of each phase winding is nmk; the span of each coil is equal but the specific value of turn number between the coils is different; and when the number of coils of the phase windings is less than or equal to nmk, all coils in phase windings are coupled when in short circuit after being series-connected. The brushless doubly-fed motor has the advantages that the span of winding coil can be flexibly changed and the turn number of each coil can be different, thereby realizing the purpose of maximally reducing the higher harmonic.
Owner:WUHAN YANGHUA ELECTRIC CO LTD
Image prediction method and associated device
ActiveCN106331722AEasy to operateReduce the number of interpolation filteringImage analysisImage codingComputation complexityMotion vector
The embodiment of the invention discloses an image prediction method and an associated device. The image prediction method comprises the following steps: determining motion vectors of W control points in a current image block; calculating the motion vectors of P pixel units of the current image block by using a motion model and the motion vectors of the W control points, wherein the precision of the determined motion vectors of the W control points as 1 / n pixel precision, the precision of the calculated motion vector of each pixel unit in the P pixel units is 1 / N pixel precision, the P pixel units are a part of or all pixel units of the current image block, and N is greater than n; and carrying out interpolation filtering on the pixels of the corresponding pixel units in a reference image of each pixel unit in the P pixel units by using an interpolation filter with a phase number Q to obtain a pixel prediction value of each pixel unit in the P pixel units, wherein Q is greater than n. The technical scheme provided by the embodiment of the invention is conducive to reducing the computational complexity of the image prediction process.
Owner:HUAWEI TECH CO LTD
Method for building multiphase polycrystalline atomic structure model
InactiveCN103714579ALow hardware and software requirementsEasy to operate3D modellingComputer sciencePhase number
The invention discloses a method for building a multiphase polycrystalline atomic structure model. The method includes the following steps: 1. preparing an atomic coordinate file of super cell structures of all phases of the built structure; 2. obtaining vertex coordinates of convex polyhedrons of a plurality of crystalline grains of any sizes through Qhull software; 3. rotating the coordinates of a supper cell of a phase at any angle, and through a method for judging inner and outer points of a polyhedron, selecting atomic coordinates of the phase inside the crystalline grain; and determining atomic coordinates of any phase inside any crystalline grain by using the same method; and 4. by controlling the proportion of all phases that fill the crystalline grains, a coordinate file of the multiphase polycrystalline atomic structure model of any phase number, any phase proportion and any crystalline grain size can be obtained by using the step 3. The method in the invention is easy to operate, has relatively low requirements for software and hardware of a computer, and can build a multiphase polycrystalline atomic structure model of a relatively large structure.
Owner:YANSHAN 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 an air 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 to one 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 satisfy 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
Aluminum alloy section of secondary stress member of automobile bumper and preparation method thereof
ActiveCN101984111AMeet the special requirements of mechanical propertiesControl the amount of precipitated phaseIngotThermal treatment
The invention relates to an aluminum alloy section of a secondary stress member of an automobile bumper and a preparation method thereof. The invention is characterized in that the 6060 aluminum alloy material of the member comprises the following components in parts by weight: 0.56-0.58 part of Mg, 0.32-0.35 part of Si, no more than 0.2 part of Fe, no more than 0.02 part of Mn, no more than 0.02 part of Cu, no more than 0.02 part of Ti, no more than 0.03 part of Zn, no more than 0.03 part of Cr, and the balance of Al. The preparation method comprises the following steps: preparing an aluminum alloy round ingot from the raw materials; extruding a section and placing the section in an aging thermal treatment furnace within 48 h, wherein the aging temperature is between 165 and 170 DEG C; and preserving heat for 3.5 h and then performing the aging thermal treatment. The invention has the beneficial effects that by introducing alloy elements, the precipitation phase number is selectively controlled and a proper amount of precipitation phase distribution is formed; the special requirements on the mechanical property of the secondary stress member of the automobile bumper can be satisfied; and batch production can be realized.
Owner:天津锐新昌科技股份有限公司
Bearing-free switch reluctance motor having axial-direction parallel hybrid structure and control method of motor
ActiveCN105024507AGood high-speed suspension performanceLow costElectronic commutation motor controlVector control systemsMagnetic bearingElectric machine
The invention discloses bearing-free switch reluctance motor having an axial-direction parallel hybrid structure and a control method of said motor. A motor stator is composed of a reluctance motor stator and a magnetic bearing stator. A rotor is composed of a salient pole rotor and a cylinder rotor. The windings are composed of torque windings and suspension windings. The torque windings are composed of reluctance motor windings and wide-tooth windings and the number of the torque windings is identical to phase number m. The suspension windings are two and are arranged in the radial direction. The magnetic bearing stator is composed of four E-shaped structures and the width of each middle tooth is twice of the rest. According to the invention, suspension current is calculated according to a suspension force direction. Current of the torque windings and switching-on and switching-off angles of a power circuit are controlled separately and rotation speed and torque are controlled in real time. Current of the two suspension windings is controlled separately, suspension forces are regulated in real time and mutual decoupling is realized in rotation and suspension. According to the invention, the quantity of control variables is small; suspension control is simple; and a power converter of a suspension system is low in cost.
Owner:NANJING UNIV OF POSTS & TELECOMM
Dynamoelectric machine having reduced magnetic noise and method
InactiveUS20070182267A1Reduce magnetic noiseSynchronous generatorsPrevention/reducing eddy-current losses in winding headsAlternatorTangential force
An automotive alternator including a rotor having a plurality of poles; a plurality of phases in operable communication with the plurality of poles; and a stator core in operable communication with the rotor, the stator having a number of slots defined by:S=(P×PH)+((M×PH)+N)where S=number of slots P=number of poles PH=number of phases M=a whole integer greater than or equal to 0 N=a whole integer selected from a group of integers ranging from, and including, 1 through the number of phases minus 1. A method for reducing magnetic noise in an automotive alternator includes selecting a number of poles, selecting a number of phases, selecting a number of stator core slots, the foregoing selections interacting in the automotive alternator to produce an order of frequency of a tangential force different than any multiple of the number of phases and different than an order of frequency of a radial force of the alternator.
Owner:REMY TECHNOLOGIES LLC
Method for identifying voltage sag reason
InactiveCN103578050AReduce the number of samplesGood effectData processing applicationsComplex mathematical operationsTime domainPower grid
The invention provides a method for identifying a voltage sag reason. The method for identifying the voltage sag reason comprises the following steps of (1) using the discrete Fourier transform to calculate a spectral density function, converting the voltage in a time domain to the voltage in a frequency domain, (2) calculating the characteristic quantity related to identification of the voltage sag reason, (3) defining a sag phase number N1, judging whether swell and a sag combination N3 exist or not, and (4) identifying the voltage sag reason. The method for identifying the voltage sag reason is comprehensive and higher in adaptability to changes of voltage sags, and can be easily improved, verification is carried out on the basis of really-measured data of a power grid, and the calculation result has better engineering practicability.
Owner:STATE GRID CORP OF CHINA +1
Static phase shedding for voltage regulators based upon circuit identifiers
ActiveUS20090267578A1Improve efficiencyReduce in quantityDc network circuit arrangementsElectric variable regulationPower modeVoltage regulation
Systems and methods are disclosed that provide static phase shedding techniques to improve the efficiency of multi-phase voltage regulators within information handling systems by selecting the number of active phases for the multi-phase voltage regulators using circuit identifiers (IDs) for circuitry configured to be powered by the multi-phase voltage regulators, such as central processing units (CPUs). In one embodiment, processor identifier information related to installed CPUs is used to control the voltage regulator (VR) phase number to provide static phase shedding. This VR control can be implemented in a variety of ways, including the use of conventional analog multi-phase VR controllers and / or digital VR controllers. Dynamic phase shedding can also be used in conjunction with this static phase shedding to further reduce the number of active phases when a processor operates in a low power mode.
Owner:DELL PROD LP
Four-level power circuit of switched reluctance motor and using method
ActiveCN107809195AQuick functionQuick demagnetization functionAC motor controlAc-dc conversionEngineeringControl switch
Owner:TIANJIN POLYTECHNIC UNIV
Programmable trouble power simulator
InactiveCN102520218AElectrical measurement instrument detailsElectrical testingFrequency shiftPhase number
The invention discloses a programmable trouble power simulator which is characterized in that the programmable trouble power simulator consists of an incoming line reactor, an LC (inductor-capacitor) filter, a direct-current bus capacitor, a voltage hall sensor, a current hall sensor, a rectification-side current transformer, an inversion-side current transformer and a direct-current voltage limiting protection circuit. An upper computer sends driving signal commands to a DSP (Digital Signal Processor) to control the work of a rectification-side current transformer and an inversion-side current transformer respectively. The programmable trouble power simulator can realize the simulation of various power grid failures such as symmetrical and unsymmetrical power grid voltage sag, unbalance three-phase circuits, harmonic distortion, frequency shift, phase angle hopping, voltage fluctuation and the like, and the parameters such as the voltage sag amplitude, the phase number, the unbalance three-phase circuit degree, harmonic times and proportion, the frequency shifting amplitude and direction, the phase angle changing size and property, voltage fluctuation trends and the failure lasting time and the like all can be adjusted flexibly. The programmable trouble power simulator can be used as a testing device for researching a wind power generation system and examining the delivery performance, or is used as a trouble power device for testing the performance of other grid-tied power electronic equipment.
Owner:ZHEJIANG UNIV
U-shaped stator hybrid-excitation switch reluctance machine
InactiveCN104935095AAchieve torque controlSimple structureWindingsMagnetic circuit stationary partsFault toleranceElectric machine
An U-shaped stator hybrid-excitation switch reluctance machine belongs to the field of an electrical machine. The U-shaped stator hybrid-excitation switch reluctance machine comprises a rotor and a plurality of U-shaped stator blocks arranged at the circumference of the rotor, the outer side of rotor teeth of the rotor is shaped as outer arc, the inner side of stator teeth of the U-shaped stator blocks is shaped as inner arc, a gap is arranged between the outer arc of the rotor teeth and the inner arc of the stator teeth, the plurality of U-shaped stator blocks form a modular stator, excitation windings are wound around the two stator teeth of each U-shaped stator block, a permanent magnet is arranged at the inner side of each U-shaped stator block, and the magnetizing direction of the permanent magnet is magnetized tangentially. When the phase number of the electrical machine is m phases, the number rate of the stator teeth to the rotor teeth of the electrical machine is 2m to (2m-1), for example, when the phase number of the electrical machine is three phases, the electrical machine is structurized with three phase 6 / 5 and three phase 12 / 10. In the U-shaped stator hybrid-excitation switch reluctance machine, the stator is the modular stator, modular production is promoted, interphase magnetic paths are not coupled and completely separated, and meanwhile, the electrical machine has the advantages of high output, simplicity in structure, high fault-tolerance capability and high reliability, is easy to maintain, and is convenient to control.
Owner:XI AN JIAOTONG UNIV
Axial-flux thin-plate motor
InactiveUS20120126653A1Low costImprove production efficiencyWindings insulation shape/form/constructionMagnetic circuitEngineeringConductor Coil
An axial-flux thin-plate motor is disclosed, which includes: a stator formed of an annular disk of silicon steel and comprising a plurality of teeth formed on one side of the annular disk, a plurality of insulation sleeves, each insulation sleeve having a shape which matches each tooth, and a plurality of coils, each coil formed around outside of each insulation sleeve, the coils connected and grouped to form n-phase windings in accordance with a phase number n of the motor; and a rotor formed of a ferromagnetic disk with a plurality of permanent magnets embedded on one side of the ferromagnetic disk.
Owner:IND TECH RES INST
Method for retrospectively classifying chest or abdomen computed tomography (CT) images based on respiratory phase
InactiveCN102068271AImprove accuracyComputerised tomographsTomographyClassification methodsAbdomen computed tomography
The invention relates to a method for retrospectively classifying chest or abdomen computed tomography (CT) images based on a respiratory phase. The method comprises the following steps of: measuring a preset respiratory cycle and setting parameters of CT scanning; performing movie-mode CT scanning so as to obtain images and endowing each image with a bed number, a layer number and a phase number; performing threshold value segmentation on each image so as to obtain the surface profile of a human body; establishing a profile matrix of each phase by using the height values of pixel points of the surface profile of the human body; accumulating the height values of elements in the profile matrix of each phase and picking out a group of images which correspond to a maximum accumulated sum value from each bed, wherein the group of images serve as an image array of a complete cycle; performing cubic spline smooth fitting on each row of vectors of a profile matrix between two phases by taking any bed as a reference bed, calculating the distance sum of profile height difference between adjacent layers of two phases and picking out image sequence numbers with the minimum distance sum so as to establish a classification matrix; and selecting a classification matrix with the minimum retrospective cycle difference degree, wherein the classification matrix is taken as a retrospective classification result.
Owner:SOUTHERN MEDICAL UNIVERSITY
Small three-phase high-performance square wave permanent magnetic DC low-speed brushless motor
InactiveCN101018002AReduce the difficulty of manufacturing processReduce distractionsMagnetic circuit rotating partsMagnetic circuit stationary partsBrushless motorsLow speed
The small-scale three-phase high-performance square-wave permanent-magnet dc brushless low-speed motor comprises: its equivalent tooth / slot number is odd and the integer times as phase number, and has the optimal matching relation between magnetic pole number and the tooth / slot relation with the minimal torque fluctuation and reluctance location torque; the stator iron core is straight slot, integer or fractal format; the winding includes the fractional slot and non-overlap concentrated winding connected by one or more piece wires as star or triangle; and a dc-drive hub without decelerator structure. This invention has high energy efficiency, low torque and loss and noise, saves cost, can be used in different occasions, and fit to produce in large-scale.
Owner:李平
Axial split-phase internal stator permanent magnet biased magnetic suspension switched reluctance flywheel motor
ActiveCN106385203AIncrease the critical speedReduce lossMagnetic circuit stationary partsMechanical energy handlingFreewheelMagnetic poles
The invention provides an axial split-phase internal stator permanent magnet biased magnetic suspension switched reluctance flywheel motor comprising an external rotor, a flywheel and an internal stator. The external rotor is packaged at the internal side of the flywheel in a laminating way. An internal stator iron core and an external rotor iron core are divided into m segments along the axis according to the phase number. The internal side of each segment of external rotor is equidistantly provided with 12 rotor poles along the circumference. The internal stator iron core is provided with 8 narrow tooth main magnetic poles and 4 wide tooth suspension poles. Main pole control coils and suspension control coils are respectively wound on the narrow tooth main magnetic poles and the wide tooth suspension poles. The coils on each narrow tooth main magnetic pole are interconnected in series to form a main pole winding. Every two of the control coils on each segment of wide tooth suspension pole are connected in series so as to form two sets of suspension windings in an orthogonal direction. The size of the system can be reduced and the critical speed of rotation can be enhanced; the suspension supporting loss can be reduced and the operation efficiency can be enhanced; and the stator poles are separately provided with the suspension poles, the main magnetic poles and magnetic isolating rings so that the control algorithm can be simplified and the suspension performance and the decoupling effect can be enhanced.
Owner:NANJING INST OF TECH
Multiphase induction motor electronic pole-changing transmission device
InactiveCN101714848ARealization of pole-changing transmissionRealize pole-changing speed regulationAC motor controlPhase differenceEngineering
The invention discloses a multiphase induction motor electronic pole-changing transmission device which comprises a multiphase induction motor, a multiphase inverter, an inversion driving unit, a detection unit and a pole-changing control unit, wherein the phase number n of the multiphase induction motor is not less than 5, a stator winding is formed by n windings the axial lines of which are arranged at intervals of 2Phi / n electrical degree in sequence, each phase winding contains at least two kinds of space harmonic components simultaneously, and a motor rotor adopts a squirrel-cage structure; the pole-changing control unit determines what kind of pole number and corresponding control freedom degree the motor adopts according to an input rotation speed signal, electric currents with different phase differences are respectively introduced to the multiphase induction motor by the multiphase inverter so as to generate rotating magnetic fields with different pole pairs in an air gap, namely, different freedom degrees can be switched so as to realize pole changing. The multiphase induction motor electronic pole-changing transmission device adopts the multiphase induction motor and a set of multiphase inverter, realizes wide-range pole-changing speed control of the transmission system, has simple winding structure and high reliability and is easy to realize large-power transmission.
Owner:ZHEJIANG UNIV
Embedded type mixing magnetic material fault-tolerant cylindrical linear motor
The invention discloses an embedded type mixing magnetic material fault-tolerant cylindrical linear motor which comprises primary bodies and secondary bodies. The length of each primary body is smaller than that of each secondary body. An air gap is reserved between each primary body and the corresponding secondary body. Each primary body comprises armature teeth, fault-tolerant teeth and a coil winding. The 2*m armature teeth and the 2*m fault-tolerant teeth are uniformly distributed on each primary body, wherein m is the phase number of the motor and is larger than or equal to three; the armature teeth and the fault-tolerant teeth are arranged at intervals in a staggered mode. Only one set of disc-shaped coil windings are placed into an armature tooth groove of each primary body. No windings are arranged on the fault-tolerant teeth. The secondary bodies of the motor are made of mixing magnetic materials, a part of ferrite is used for replacing a part of rare earth permanent magnets to form four different mixing magnetic material structures, on one hand, the quantity of the adopted rare earth permanent magnets is greatly reduced, and the cost of the motor is reduced; on the other hand, as the magnetic energy product of the permanent magnets is reduced, the eddy-current loss of the motor is reduced greatly, and efficiency of the motor is improved.
Owner:JIANGSU UNIV
Order feed message stream integrity
InactiveUS20130060887A1Reduce network trafficEasy to detectError preventionFinanceComputer hardwareMessage flow
Systems, methods, and computer-readable storage media are provided for improving order feed message stream integrity. Certain embodiments provide a method including sending, by a computing device, a first data message; sending a first stop message; clearing a message stream state; and sending a second data message. The first data message includes data related to an order for a tradeable object, a first sequence number with a value of a predefined initial sequence number, and a first phase number. The second data message includes data related to an order, a second sequence number with a value of the predefined initial sequence number, and a second phase number, wherein the second phase number is different than the first phase number. The message stream state is associated with the order.
Owner:TRADING TECH INT INC
Multiphase power regulator with load adaptive phase control
ActiveUS8193796B2Maximize efficiencyImprove efficiencyDc-dc conversionAc network voltage adjustmentActive phaseEngineering
Disclosed is a power regulator for providing precisely regulated power to a microelectronic device such as a microprocessor. Improved power regulation is accomplished by optimizing the power efficiency of the power regulator. In particular, in a multiphase system, the number of active phases is increased or decreased to achieve optimum power efficiency. The multiphase voltage regulator adapts the operating mode to maximize efficiency as the load current demand of the load device changes by adjusting the number of active phases to maximize efficiency. The total value of current provided by the regulator and the total number of active phases is determined, the total number of active phases is compared with the number of active phases required to provide the total value of current at maximum efficiency; and the number of active phases is adjusted to provide the total value of current at maximum efficiency.A current sense circuit senses the current at each phase, a summing circuit coupled to the output of the current sense circuit provides the total current value of all the measured phases, a circuit coupled to the output of the summing circuit provides the time averaged total current value to a threshold detecting circuit that determines the number of phases at which the voltage regulator should be operating for maximum efficiency, and a circuit for comparing the number of phases that are operating to the number of phases at which the voltage regulator should be operating adjusts the number of active phases to the number of phases at which the voltage regulator should be operating for maximum efficiency.
Owner:INFINEON TECH AUSTRIA AG
T-type flux-switching permanent magnet linear motor and modules of T-type flux-switching permanent magnet linear motor
InactiveCN104167896AImprove fault toleranceImprove reliabilityPropulsion systemsNon magneticConductor Coil
The invention discloses a module-complementary-type flux-switching permanent magnet linear motor which comprises a primary part and a secondary part. The primary part and the secondary part are of convex electrode structures. An air gap is reserved between the primary part and the secondary part. The primary part comprises primary iron cores, permanent magnets, non-magnetic blocks and armature windings. Magnetic teeth are formed by the primary iron cores. A T-type unit is formed by each permanent magnet and the magnetic teeth on the two sides of the permanent magnet. The primary part comprises N*m T-type units, wherein the N is the number of coils in the windings of each phase, and the m is the number of the phases of the motor. A module is formed by i T-type units. The module-complementary-type flux-switching permanent magnet linear motor has the symmetrical complementarity, the manufacturing difficulty is lowered, waveforms of flux linkages and waveforms of counter electromotive force of the motor are symmetrical and are in sine shapes, fluctuation of push force is remarkably reduced, and the module-complementary-type flux-switching permanent magnet linear motor is particularly suitable for linear driving occasions such as urban rail traffic systems, factory transport transmission devices and elevators.
Owner:JIANGSU UNIV
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