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77results about How to "Reduce harmonic loss" patented technology
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Permanent magnet synchronous motor (PMSM) AC servo system
InactiveCN101867343AEliminate fluctuationsReduce harmonic lossElectronic commutation motor controlVector control systemsOvervoltagePermanent magnet synchronous motor
The invention relates to a permanent magnet synchronous motor (PMSM) AC servo system, which is composed of a DSP control panel, a rotary transformer, a main power circuit and a conditioning and protecting circuit, a motor body consists of an armature winding and a permanent magnet core rotor, wherein the motor is excited by a permanent magnet, and the DSP is used for realizing an field-orientated control algorithm, communication, sampling calculation of current and configuration output of a drive; the output of the rotary transformer enables data to be transmitted to the DSP via four-path DA transform chips and SPI of the DSP or multi-channel buffering; the DSP outputs pulse width modulation, is connected with voltage signals output by a current regulator, and is connected with a PWM1-PWM3 drive inverter which can convert the voltage signals into three-phase switch signals by CLARK inverse transformation, and the inverter outputs to the armature winding so as to control the armature winding of the motor to generate a rotary round magnetic field; and the main power circuit is composed of a direct current detection circuit with controllable rectification, an inverter, a current detection circuit, an overvoltage discharging circuit, a protection circuit and a driving circuit. The invention adopts the field-orientated control algorithm which can control the torque, speed and position state of the motor in real time and has good control performance.
Owner:南京大桥机器有限公司
Magnetic field modulating type concentric magnetic gear transmission device in Halbach magnet structure
InactiveCN101662202AHarmonic reductionReduce harmonic lossDynamo-electric gearsDensity distributionDetent
The invention provides a magnetic field modulating type concentric magnetic gear transmission device in a Halbach magnet structure, which comprises a shell, an outer rotor and an inner rotor, whereinthe outer rotor and the inner rotor are installed in an inner cavity of the shell and are in a cantilever type; the inner rotor comprises an inner rotor iron core and a permanent magnet, which are installed on an output shaft of the inner rotor; the outer rotor comprises an outer rotor iron core and a permanent magnet, which are installed on an output shaft of the outer rotor; a magnetic modulation ring is arranged between the permanent magnet of the inner rotor and the permanent magnet of the outer rotor; and the magnetic modulation ring comprises an iron core block and is fixed on an end plate of the shell. The magnetic gear transmission device comprises two layers of air gaps, wherein an inner-layer air gap is formed between the inner rotor and the magnetic modulation ring, and an outer-layer air gap is formed between the outer rotor and the magnetic modulation ring. The magnet structure uses a Halbach array to replace the conventional radial structure, thereby improving the magnetic density distribution of the air gaps of the magnetic gear transmission device. Because the magnetic density of the air gaps approaches to sinusoidal distribution, the detent torque of the magnetic gear transmission device in the structure is greatly reduced, thereby decreasing the vibration and noise of the magnetic gear transmission device and improving the running efficiency.
Owner:SHANGHAI UNIV
Optimization control method based on selective harmonic elimination pulse width modulation (SHEPWM)
ActiveCN102983768ASatisfy the Harmonic RequirementsReduce the amplitudeDc-ac conversion without reversalSmall amplitudeHarmonic
The invention provides an optimization control method based on selective harmonic elimination pulse width modulation (SHEPWM). The optimization control method based on the SHEPWM comprises the following steps: writing amplitude expressions of fundamental waves and controlled harmonic waves of all times in an arraying mode, confirming amplitude of the fundamental waves and the controlled harmonic waves of all times, and obtaining a switch angle. The optimization control method is combined with characteristics of amplitude frequency of a filter, obtains the most advantageous size value of the amplitude of the controlled harmonic waves by optimizing an objective function, improves the harmonic wave distribution condition of an SHEPWM wave form, reduces amplitude of surplus harmonic wave, enables a total harmonic content to reduce, and even removes the big surplus harmonic waves. Small amplitude changes of a controlled harmonic wave component can cause great influence on harmonic wave distribution of output voltage, and suitable changes can reduce amplitude of surplus harmonic wave components of a traditional SHEPWM method.
Owner:GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
On-line type digital electricity generating system with UPS function
InactiveCN101291078AOvercome deficienciesSolve the shortcomings of low power generation qualityBatteries circuit arrangementsElectric powerOvervoltageLow voltage
The invention relates to a motor, and in particular belongs to an online digital generator system with UPS function. The technical proposal adopted by the invention is as follows: the invention consists of a commercial power controllable rectifier circuit with one end connected with commercial power input and a by-pass control circuit and the other end connected with a back-up battery charging management circuit, a back-up battery pack, a generator controllable rectifier circuit and a common inverter circuit; the back-up battery charging management circuit is connected with the back-up battery pack; the generator controllable rectifier circuit is connected with a generator; the common inverter circuit is connected with the by-pass control circuit; and the by-pass control circuit is connected with a display control circuit and output. The online digital generator system has the advantages of having function of online adjusting the quality of a power supply, and solving the phenomena frequently occurring in electric network, such as electric surge, high-voltage spike pulse, transient overvoltage, voltage sag, electrical wire noise, frequency deviation, sustained low voltage, commercial power interruption and so on.
Owner:FUJIAN HONGWANG ELECTRONICS TECH
Environment-friendly and energy-saving DC power station
InactiveCN101557116AReduce harmonic lossRealize regulationReactive power adjustment/elimination/compensationDc circuit to reduce harmonics/ripplesDc currentLow voltage
The invention discloses an environment-friendly and energy-saving DC power station. The DC power station comprises an input AC voltage sampling circuit, an input AC current sampling circuit, a load voltage regulator, a rectiformer, a commutator, a controller, a filter and power compensation device, an output DC voltage sampling circuit, and an output DC current sampling circuit, the output of the input AC voltage sampling circuit and the input AC current sampling circuit is connected with the controller, the load voltage regulator is serially connected between the AC input power supply and the input end of the rectiformer, the secondary lateral low voltage winding of the rectiformer is connected with the input end of the commutator, the secondary lateral medium voltage winding of the rectiformer is connected with the filter and power compensation device, the output of the output DC voltage sampling circuit and the output DC current sampling circuit is connected with the controller, the control output of the controller is respectively connected with the commutator and the control end of the filter and power compensation device. The invention can realize the constant control of the high power factors and good harmonic wave shield as well as can improve the running efficiency of the system.
Owner:HUNAN UNIV SCI PARK CO LTD +2
Induction and phase-shifting rectifier transformer
InactiveCN101877271AReduce harmonic lossReduce vibrationTransformers/inductances coils/windings/connectionsUnwanted magnetic/electric effect reduction/preventionMagnetomotive forceHarmonic
The invention discloses an induction and phase-shifting rectifier transformer. The transformer is in a three-pole iron core structure, wherein each iron core pole is wound by four windings which include an AC line side winding, a filter winding, a valve side star-connected winding and a valve side delta-connected winding; the line side winding is arranged in the innermost layer of each iron core pole; the filter winding is arranged on the external layer of the line side winding; and the valve side star-connected winding and the valve side delta-connected winding are arranged on the external layer of the filter winding and respectively connected with a group of six-pulse rectifiers. The invention can counteract harmonic magnetomotive force generated by 5, 7, 11, 13, 17 and 19 characteristic harmonic currents of the transformer, thereby ensuring that the current in the line side winding is basically in a sine wave mode and greatly reducing the harmonic loss of the line side winding and other AC line side power equipment.
Owner:HUNAN UNIV +2
User side energy-saving power-saving management system
ActiveCN106300652AReduce harmonic lossGuarantee product qualityCircuit arrangementsInformation technology support systemPower savingEmbedded system
The invention relates to a user side energy-saving power-saving management system. The user side energy-saving power-saving management system comprises a server host, a communication network, a wireless transmission part, a wired transmission part, and various metering points. The server host is connected with the wireless transmission part and the wired transmission part by a communication network. The wireless transmission part and the wired transmission part are respectively connected with the various metering points. An electric energy on-line module, a power utilization analysis module, an auxiliary deciding module, an ordered power utilization module, and an energy-saving diagnosis consultation service module are embedded in the server host. Compared with the prior art, an object of realizing enterprise intelligent energy efficiency management is achieved, and power utilization costs are saved, and power utilization quality is improved.
Owner:SHANGHAI JIAQI NETWORK TECH CO LTD
High-voltage back-to-back converter
InactiveCN101834451AIncrease production capacityEasy to install and debugAc-dc conversionSingle network parallel feeding arrangementsCapacitanceLow voltage
The invention relates to a high-voltage back-to-back converter. The converter comprises a plurality of bridge arms with the same structure, wherein the upper bridge arm and lower bridge arm of each bridge arm both contain the same number of low-voltage power units; each bridge arm corresponds to single input or output phase of the back-to-back converter; the upper ends of the bridge arms are connected, the lower ends of the bridge arms are connected, the high-voltage DC bus does not need to support capacitors; each bridge arm comprises an induction module which is composed of two capacitors in serial connection; the connection point of two terminals of the two capacitors is used as the output terminal of the bridge arm; and one of the residual two terminals of the two capacitors is connected with the lower end of the upper bridge arm of the bridge arm, and the other terminal is connected with the upper end of the lower bridge arm of the bridge arm. The invention is applicable to the high-voltage AC drive occasions such as single phase / single phase, single phase / three phase, three phase / three phase and three phase / multiphase.
Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
Multi-string SVC (Static Var Compensator) coordination control method
ActiveCN102545241AReduce harmonic lossPracticalFlexible AC transmissionReactive power adjustment/elimination/compensationControl objectiveControl cell
The invention relates to a multi-string SVC (Static Var Compensator) coordination control method, which comprises the following steps of: judging by an equal network loss ratio standard, selecting one of single subcircuit compensation, equidistant coordination compensation or random compensation as a compensation control scheme, and defining a var control numerical value; selecting one SVC control subcircuit as a main control unit from SVC control subcircuits in a power supply system, collecting system voltage and current signals through the main control unit; comparing the system voltage and current signals with a var control target so as to obtain a var power numerical value needed by the system; generating a compensation scheme according to compensator volume of each SVC subcircuit; and issuing a control command to a controlled unit of each subcircuit through the main control unit, and jointly executing the compensation coordination control command through the main control unit and the controlled unit of each subcircuit. According to the method, multiple var harmonic oscillation is avoided, the stability of the system is improved, the harmonic loss is reduced, and the multi-string SVC coordination control method is particularly applied to electric power supply systems constructed by stages.
Owner:保定市尤耐特电气有限公司
Filtering type power transformer integrated system and implementation method thereof
ActiveCN102820129AEffective shieldingImprove power factorTransformers/inductances coils/windings/connectionsReactive power adjustment/elimination/compensationLow voltageTransformer
The invention discloses a filtering type power transformer integrated system and an implementation method thereof. The filtering type power transformer integrated system comprises a transformer and a filtering compensating device, wherein the transformer is provided with a three-winding structure or a four-winding structure; the three-winding structural transformer comprises a high-voltage winding, a medium-voltage winding and a low-voltage shielded winding, wherein the low-voltage winding and the shielded winding share one winding; the low-voltage (shielding) winding is arranged between the high-voltage winding and the medium-voltage winding, and the low-voltage (shielding) winding is connected with the filtering compensating device; the four-winding structural transformer comprises a high-voltage winding, a medium-voltage winding, a low-voltage winding and a shielding winding; and the four windings, namely the low-voltage winding, the medium-voltage winding, the shielding winding and the high-voltage winding are arranged on an iron core of the transformer in sequence, and the shielding winding is connected with the filtering compensating device. The filtering type power transformer integrated system and the implementation method thereof provided by the invention have the advantages of reducing harmonic loss, and improving power factor.
Owner:HUNAN HUADA ELECTRICIAN HI TECH
Amplification module suitable for class F or inverse class F power amplifier
ActiveCN105141262ASmall sizeImprove efficiencyPower amplifiersAmplifier modifications to raise efficiencyThin-film bulk acoustic resonatorAudio power amplifier
The invention discloses an amplification module suitable for a class F or inverse class F power amplifier. The amplification module is applied to the class F power amplifier or the inverse class F power amplifier. The amplification module comprises a transistor, a resonator module for realizing harmonic wave matching required by the class F or inverse class F power amplifier, a base, a signal input end and a signal output end. The resonator module comprises a parallel resonator group and a series resonator group. The parallel resonator group comprises a first resonance module and a second resonance module. The series resonator group comprises a third resonance module and a fourth resonance module. Each resonance module comprises at least one film bulk acoustic resonator. Through adoption of the amplification module, the size of the class F power amplifier or the inverse class F power amplifier is reduced, harmonic loss is lowered, the efficiency of the power amplifier is improved, mutual interference of a harmonic wave matching network and a fundamental wave matching network is reduced, and the design of the class F power amplifier or the inverse class F power amplifier is easier.
Owner:DYNAX SEMICON
Sine wave current self-starting three-phase rare earth permanent-magnetism synchronous motor
ActiveCN101651395AGood symmetryReduce negative sequence componentsMagnetic circuit rotating partsSynchronous machines with stationary armatures and rotating magnetsSynchronous motorManufacturing technology
The invention relates to a sine wave current self-starting three-phase rare earth permanent-magnetism synchronous motor comprising a motor shaft (1), a rotor (3) and a stator (6), wherein the rotor (3) is arranged in the stator (6) and rotates around the motor shaft (1); the pole face of the rotor (3) comprises P pairs of poles, each pole comprises a pole arc face (302), and planes (301) are arranged between the adjacent pole arc faces. In the invention, each pole at the pole face of the rotor comprises one pole arc face, the planes are arranged between the adjacent pole arc faces, a non-uniform air gap is formed between the pole face of the rotor and the inner circle of the stator, and the asymmetry on a magnetic path, which is caused by a permanent magnet, is counteracted by utilizing the characteristic of a convex pole structure of the non-uniform air gap so that the structure of the rotor has simple manufacturing technology, the negative sequence component of the current of the rotor in the self-starting process of the motor is greatly reduced, the starting performance of the motor is enhanced, the motor can also have very good sine wave current in the running process, the harmonic loss is reduced and the efficiency of the motor is enhanced.
Owner:HUBEI SEEPOMOTOR SCI & TECH
Single-winding two-phase brushless DC motor
ActiveCN107070012ASmall magnetic field distortionImprove efficiencyAssociation with control/drive circuitsMagnetic circuit rotating partsMagnetic polesConductor Coil
The invention provides a single-winding two-phase brushless DC motor and relates to a motor. The single-winding two-phase brushless DC motor includes a stator part, a rotor part and a controller. The motor has two rotor magnetic poles and four stator windings. The stator windings adopt a single-winding working mode. A 90-degree electrical degree is between two winding current phases, so that no zero-torque dead point exists and no asymmetric air gap structure is needed. An annular pole shoe is arranged in the center of the stator iron core. No open gullet exists in a motor air gap, so that no gullet torque exists. Compared with a common mini-size single-phase brushless DC fan, in the air gap, the magnetic field distortion decreases, the stator magnetomotive force harmonic loss is small, the output torque is large and the motor efficiency is high. The controller adopts two controller chips of the common mini-size single-phase brushless DC fan and the drive type of the controller chips belongs to the single-winding working mode, an advantage of low cost is achieved. Since the rotor magnetic pole number is two, the rotor magnetic pole arc angle is large. The precision of a Hall element in tracking the magnetic pole state of a rotor permanent magnet is high and an out-of-control phenomenon is prevented.
Owner:湖南泰合电机有限公司
Power generating device
InactiveCN104539072AImprove assembly productivityEasy to installMagnetic circuit rotating partsMechanical energy handlingCouplingEngineering
The invention discloses a power generating device. The power generating device comprises an engine and a generator. An output shaft of the engine is connected with a rotor shaft of the generator through a flexible coupling. The generator comprises the rotor shaft, iron cores and permanent magnets. The iron cores are composed of multiple stampings in an overlapping mode. An axle hole and mounting holes of the permanent magnets are arranged in the central sections of the stampings. The permanent magnets can be directly inserted into the iron cores on the rotor shaft composed of the stampings and therefore the quick and convenient installation can be achieved. More of the corner magnetic line of force of the permanent magnets can pass through the iron cores in a more even manner through communicated grooves. The boundary lines of the adjacent magnetic fields can be made clearer due to heat emission holes and concave grooves. A better linear distribution of the magnetic fields can be achieved, harmonic waves losess can be reduced and the working efficiency of the engine can be improved. Meanwhile, self-adaptive adjustment is achieved by flexible transmission ring segments and the flexible transmission ring segments are capable of compensating the errors in manufacturing, assembling and transmitting. The transmission vibration is low and the adaptability is high. At the same time, the manufacturing precision and the assembling difficulty are lowered, the working efficiency in assembling the power generating device is improved and the damage, caused by assembling errors, to the engine and an electric motor is avoided.
Owner:CHONGQING ZHIREN ELECTRIC EQUIP
Single resistance motor current sampling method, motor drive circuit and readable storage medium
ActiveCN109188046AAvoid waveform asymmetry problemsAvoid asymmetryDirection of current indicationVoltage polarity indicationElectrical resistance and conductancePhase shifted
The invention belongs to the technical field of motor sampling, and provides a single resistance motor current sampling method, a motor drive circuit and a computer readable storage medium. In the single resistance motor current sampling method, the PWM pulse of the motor drive circuit will be phase-shifted or compensated once only when the time sampling area of the motor drive circuit is continuously in the non-observation area of the motor multiple times. In the process of multiple current sampling, the time sampling area of the motor drive circuit is not continuously in the non-observationarea of the motor multiple times or the time sampling area of the motor drive circuit is in the observation area. At this time, the PWM pulse of the motor drive circuit does not need to be phase-shifted or compensated. Therefore, the single resistance motor current sampling method greatly reduces the number of times of phase-shifting or compensation for the PWM pulse, and solves the problem of large harmonic loss in the motor drive circuit caused by severe asymmetry of the pulse current in the motor drive circuit in traditional technology.
Owner:GUANGDONG GOBAO ELECTRONICS TECH CO LTD
A rotor double-winding structure of a megawatt doubly-fed wind turbine
InactiveCN102290898AImprove defectsImproved leakage reactanceMagnetic circuit rotating partsWindings conductor shape/form/constructionFrequency changerPower quality
A rotor double-winding structure of a megawatt doubly-fed wind power generator, the rotor slot adopts a semi-closed slot, the rotor winding adopts a stacked loose embedded winding, and the winding has two sets of three-phase symmetrical windings. The number of parallel branches of the first set of windings is 1. The number of parallel branches of the second set of windings is 2, and the corresponding phases of the two sets of windings are connected in series to form a star connection. The structure of the first set of windings is a double-layer stacked winding with unequal turns and unequal spacing, which is used to improve the non-sinusoidal magnetic potential formed by the hard coil of the wave winding; the second set of windings is a short-pitch stacked winding, three-phase symmetrical, mutually The electrical angle difference is 120°, the pitch of this set of windings is small, the wire is saved, and it is used to resist the distortion of the sinusoidal current supplied by the frequency converter. The invention improves the disadvantages of poor power generation quality, many headgears and poor reliability of the conventional wave winding hard winding, greatly reduces the magnetic potential harmonic, and the rotor magnetic potential waveform is highly sinusoidal to reduce harmonic loss and heat generation. Reduce temperature rise, improve power generation quality, efficiency, reliability and economy.
Owner:JIANGXI TELLHOW SPECIAL MOTOR CO LTD
Rotor and permanent magnet motor
InactiveCN106451852AImprove waveformReduce harmonic contentMagnetic circuit rotating partsHarmonicMagnetization
The invention provides a rotor and a permanent magnet motor. The rotor includes a rotor core and a permanent magnet which is arranged in a mounting groove in the rotor core, wherein the permanent magnet is provide with a first end and a second end; the first end is far away from a center shaft of the rotor core; the second end approaches to the center shaft of the rotor core; and from the first end to the second end, the thickness of the permanent magnet is not consistent in the magnetization direction. The scheme of the rotor and the permanent magnet motor can solve the problem that the rotor of an existing permanent magnet motor is relatively high in the air-gap flux density harmonic wave content and is relatively small in the reluctance torque.
Owner:ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION
Energy-saving intelligent filter compensation metering comprehensive protection automatic transmission
InactiveCN103515959AIncrease the switching frequencyReduce lossActive power filteringSubstation/switching arrangement detailsCapacitanceEngineering
The invention relates to the technical field of electric matched products, in particular to an energy-saving intelligent filter compensation metering comprehensive protection automatic transmission which comprises a box body. The inside of the box body is provided with an active power filter, a connection electric reactor, an isolation switch, a current transformer and an outgoing breaker. The active power filter is connected to the secondary side of the current transformer of a grid through the connection electric reactor. The upper end of the isolation switch is directly connected with the secondary side of the current transformer of the grid, and the lower end of the isolation switch is connected with the outgoing breaker through the isolation switch in an outgoing mode. According to the automatic transmission, harmonic currents on a bus are eliminated in real time, the operation efficiency of the transformer is improved, operation safety of the transformer and electric equipment is guaranteed, the phenomena of abnormal operation of the transformer, system resonance and compensation capacitor overflowing caused by harmonic currents are avoided, the service life of the equipment is prolonged, and the phenomenon that a capacitance box often fails in the prior art is avoided. The box transformer structure technically has the advantages of being modularized, small in size, attractive in appearance, safe and reliable in operation, convenient to maintain and the like.
Owner:ANHUI HUAZHENG ELECTRIC
High-speed special submerged motor for engineering ship
ActiveCN102035305ASolve fever problemImprove sealingCooling/ventillation arrangementSupports/enclosures/casingsPunchingWater leakage
The invention relates to a high-speed special submerged motor for an engineering ship, which comprises a stator, a rotor, a movable sealing device, a shaft current preventing structure and a leader cable. The motor is characterized in that a stator punching (1) is in a parallel gear structure; the groove-shaped part of a rotor punching (2) is in a structure that the upper portion is wider than the lower portion; the movable sealing device is arranged at the end part of the submerged motor and comprises a stator (3) and a revolving shaft (12); a shaft sleeve (10) is fixed on the revolving shaft (12) and provided with a cooling water inlet (14) and a cooling water outlet (15), and the inside of the shaft sleeve (10) is provided with longitudinal blades (16); the shaft current preventing structure is arranged at the tail of the submerged motor; and the leader cable comprises a junction box (30), an external nut (39), an internal nut (31), a three-core cable (28) and a pipe joint (34). The invention solves the problem of cooling the heated shaft sleeve and bearing of the submerged motor, improves the adaptability of the submerged motor to non-sinusoidal power supplies, effectively prevents the damage to the bearing caused by the occurrence of shaft current, and ensures that the submerged motor runs for a long time without water leakage under the hydraulic pressure at the position of 30 meters below the water surface.
Owner:浙江临海浙富电机有限公司
Battery system comprising a hybrid battery and an npc inverter which is connected at the input end to the battery, and method for operating an npc inverter which is connected at the input end to a hybrid battery
ActiveCN107078663AThe efficiency of the combination is highMany degrees of freedomSpeed controllerAC motor controlElectrical batteryEngineering
Owner:ROBERT BOSCH GMBH
Permanent magnet segmented PWM array sine wave disc type motor
InactiveCN104467327AReduce harmonic componentsReduce harmonic lossMagnetic circuit rotating partsElectric machinePermanent magnet synchronous motor
The invention relates to the field of disc type motors, in particular to a sine wave disc permanent magnet synchronous motor, and discloses a permanent magnet segmented PWM array sine wave disc type motor. The permanent magnet segmented PWM array sine wave disc type motor comprises rotor discs, stator discs and permanent magnets, and the permanent magnets are mounted on the rotor discs. The stator discs are mounted between every two stator discs, and the number of the rotor discs is larger than the number of the stator discs by one. The stator discs and the rotor discs are coaxially mounted, and the stator discs and the rotor discs are alternately arrayed in the axial direction. The permanent magnets of each pole on the rotor discs are arranged in a segmented mode, the number of the permanent magnet segments under each pole is an odd number, and the width of each permanent magnet segment is determined according to the PWM principle. The harmonic component of the induced electromotive force of the motor is lowered, and the harmonic loss of the motor is reduced. The vortex loss of the permanent magnets is lowered, the temperature of the permanent magnets on rotors is lowered, the high-temperature demagnetization risk of the permanent magnets is lowered, and the efficiency of the motor is improved. The permanent magnets of each pole are the same in thickness and are beneficial to processing and designing. Meanwhile, after multiple segments of permanent magnets are divided, the mounting process can be better simplified.
Owner:江苏交科能源科技发展有限公司 +1
Environment-friendly and energy-saving DC power station
InactiveCN101557116BReduce harmonic lossRealize regulationAc-dc conversionReactive power compensationPower factorLow voltage
The invention discloses an environment-friendly and energy-saving DC power station. The DC power station comprises an input AC voltage sampling circuit, an input AC current sampling circuit, a load voltage regulator, a rectiformer, a commutator, a controller, a filter and power compensation device, an output DC voltage sampling circuit, and an output DC current sampling circuit, the output of theinput AC voltage sampling circuit and the input AC current sampling circuit is connected with the controller, the load voltage regulator is serially connected between the AC input power supply and theinput end of the rectiformer, the secondary lateral low voltage winding of the rectiformer is connected with the input end of the commutator, the secondary lateral medium voltage winding of the rectiformer is connected with the filter and power compensation device, the output of the output DC voltage sampling circuit and the output DC current sampling circuit is connected with the controller, thecontrol output of the controller is respectively connected with the commutator and the control end of the filter and power compensation device. The invention can realize the constant control of the high power factors and good harmonic wave shield as well as can improve the running efficiency of the system.
Owner:HUNAN UNIV SCI PARK CO LTD +2
Double-winding and double-phase brushless direct current motor
InactiveCN106849586AReduce harmonic lossSmall magnetic field distortionAssociation with control/drive circuitsAC motor controlPhysicsDistortion
The invention is a double-winding two-phase brushless direct-current motor, which relates to a motor, which includes a stator part, a rotor part and a controller. The number of magnetic poles of the rotor is two poles, the number of slots of the stator is four slots, and the working mode of the stator winding is double winding. The current phase difference of the two-phase windings is 90 degrees electrical angle, there is no dead point where the torque is zero, and there is no need to adopt an asymmetrical air gap structure. No cogging torque. Compared with ordinary miniature single-phase brushless DC fans, the magnetic field distortion in the air gap is small, the stator magnetomotive force harmonic loss is small, the output torque is large, and the motor efficiency is high. The controller adopts two ordinary miniature single-phase brushless DC fan controller chips, and uses an external power switch tube to expand the current driving capability, which has the advantage of low cost. If the number of rotor magnetic poles is two, the angle of the rotor magnetic pole pole arc is large, and the Hall element can track the magnetic pole state of the permanent magnet of the rotor with high precision, and it is not easy to cause out-of-control phenomena.
Owner:大连碧蓝节能环保科技有限公司
SVG configuration optimization method in power distribution network containing distributed power supply
ActiveCN111555299AFlexible settingsFlexible setting of corresponding weightFlexible AC transmissionSingle network parallel feeding arrangementsConfiguration optimizationDistribution grid
The invention relates to an SVG configuration optimization method in a power distribution network containing a distributed power supply. The method comprises the steps of drawing a topological structure of a to-be-optimized power distribution network; after the SVG is connected to each node, calculating the weighted voltage distortion rate and the total harmonic loss of the whole power distribution network; taking the weighted voltage distortion rate and the total harmonic loss of the whole power distribution network as constraint conditions to calculate the optimization factors after the weighted voltage distortion rate and the total harmonic loss are weighed, obtaining the final configuration optimization factor, and selecting the node corresponding to the minimum optimization factor asthe optimal position suitable for SVG access. The method is high in operability and high in calculation efficiency and is convenient to implement.
Owner:STATE GRID HEBEI ELECTRIC POWER RES INST +2
Motor synchronous modulation method and control system thereof
ActiveCN102223138BSmall amount of calculationQuick responseElectronic commutation motor controlAC motor controlControl systemElectric machine
Owner:ZHUZHOU CSR TIMES ELECTRIC CO LTD
Rotor permanent magnet series distribution-linked high-voltage permanent-magnet synchronous motor
InactiveCN108667252AAvoid loss of magnetismLarge intersection areaMagnetic circuit rotating partsMagnetic circuit stationary partsPunchingSynchronous motor
The invention relates to the technical field of high-voltage permanent magnet synchronous motors, and discloses a rotor permanent magnet series distribution-linked high-voltage permanent magnet synchronous motor, which comprises a motor shell, a stopper is fixedly connected with the motor shell, a first fixing seat is fixedly connected with stopper, a second fixing seat is fixedly arranged on theinner wall on the right side of the motor shell. The rotor permanent magnet series distribution-linked high-voltage permanent magnet synchronous motor can make the waveform of the counter electromotive force achieve the best effect as long as the design of each segment length is appropriate, the useless harmonic generated by the stator is minimized, the harmonic loss is minimized, the motor achieves high efficiency, the manufacturability is good, the rotor punching die is most simple, and each magnetic steel is easy to install due to small volume, and the design level and the process level ofthe high-voltage permanent magnet motor become reliable and efficient, so that the design of this type of motor becomes feasible, and meanwhile, the motor can be applied to various complex occasions.
Owner:武汉麦迪嘉机电科技有限公司
Double-cage rotor magnetic pump
InactiveCN102954004AReduce harmonic lossShorten start timePump componentsDynamo-electric gearsMagnetic fluxRotor magnets
The invention relates to the technical field of electromagnetic power, and provides a double-cage rotor magnetic pump, which comprises a motor, a pump body, a shell, an input shaft and an output shaft, wherein the input shaft is rotatably arranged at one side of the shell, and the first end of the input shaft is arranged in the shell; the second end of the input shaft is arranged outside the shell, and the output shaft is rotatably arranged on the pump body; the first end of the output shaft is arranged in the shell, and the second end of the output shaft is arranged in the pump body; a cup-shaped sleeve is arranged on the first end of the input shaft, and an annular outer magnetic rotor core is arranged on the inner side edge of the cup-shaped sleeve; an annular shaft sleeve is arranged at the first end of the output shaft, and an annular inner rotor core is arranged outside the annular shaft sleeve; an outer magnetic rotor magnet ring is arranged on the inner wall of the annular outer magnetic rotor core, and upper and lower mouse cages are arranged on the annular inner rotor core; and the inner rotor core and the upper and lower mouse cages form an inner rotor, and an annular gap is formed between the outer magnetic rotor magnet ring and the inner rotor. With the technical scheme provided by the invention, the air-gap magnetic flux density forms a sine waveform, and the harmonic loss of the core is reduced.
Owner:SHANGHAI DIANJI UNIV
Three-phase dry transformer for motor train unit auxiliary system
PendingCN112435835AReduce thicknessReduce circulationTransformers/inductances coils/windings/connectionsTransformers/inductances magnetic coresCopper conductorTransformer
The invention discloses a three-phase dry transformer for a motor train unit auxiliary system, and the transformer comprises an iron core and a main coil arranged on the periphery of the iron core ina winding mode; the iron core comprises a main iron core body and an auxiliary iron core body, the main coil comprises a low-voltage winding and a high-voltage winding, and the main iron core body comprises a main iron core column and a main iron yoke connected with the main iron core column. The auxiliary iron core comprises an auxiliary iron core column and an auxiliary iron yoke connected withthe auxiliary iron core column, the low-voltage wire is wound on the main iron core column to form a low-voltage winding, the high-voltage wire drives the auxiliary iron core column to be wound on thelow-voltage winding at the same time to form a high-voltage winding, and the high-voltage winding and the low-voltage winding comprise a plurality of transposition copper wires which are wound in parallel; and the lengths of the transposed copper conductors which are arranged in parallel are the same. By means of the mode, the three-phase dry-type transformer for the auxiliary system of the motortrain unit can reduce the thickness of a single wire, meanwhile, the chance that each wire is located in a leakage magnetic field is equal, circulation between the wires is reduced, harmonic loss isreduced, and the overall harmonic loss can be reduced by 80%.
Owner:BOMBARDIER NUG PROPULSION SYST CO LTD
Motor frequency conversion control method and apparatus
ActiveCN107846171AReduce harmonic lossSimple processAC motor controlVariable frequency controlMotor drive
The invention provides a motor frequency conversion control method and apparatus, and relates to the technical field of frequency conversion of a motor; and not influenced by nonlinear parameters of the motor, high robustness is achieved. According to the main technical scheme, the motor frequency conversion control method comprises the steps of obtaining the actual position of a voltage vector ofthe motor; obtaining the instruction position of the voltage vector of the motor; and adjusting the motor drive switching frequency according to deviation between the actual position of the voltage vector and the instruction position of the voltage vector. The motor frequency conversion control method is mainly used for realizing synchronous frequency conversion control in the dynamic changing process of the motor.
Owner:BEIJING CHEHEJIA AUTOMOBILE TECH CO LTD
Box-type high-speed motor
InactiveCN112242775AGuaranteed uptimeEnsure balanceMagnetic circuit rotating partsMagnetic circuit stationary partsElectric machineClassical mechanics
The invention discloses a box-type high-speed motor which is mainly composed of a box-type motor stator, a bearing installed on a box-type motor stator base and a motor rotor supported by the bearing,a cooler is located at the top of the box-type motor, and the motor rotor is of a solid rotor structure and is provided with balance areas at the two ends of a rotor body. The motor rotor is also provided with a balance area in the center of the rotor body. The box-type high-speed motor is compact in structure and reliable in operation, and is suitable for higher-rotating-speed working conditions.
Owner:WOLONG ELECTRIC NANYANG EXPLOSION PROTECTION GRP CO LTD +1
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