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1591 results about "Three phase windings" patented technology

Three-Phase Transformer Windings and Connections. A three-phase transformer is made of three sets of primary and secondary windings, each set wound around one leg of an iron core assembly. Essentially it looks like three single-phase transformers sharing a joined core as in Figure below. Three phase transformer core has three sets of windings.

Generator system for wind power generation and variable speed control method

InactiveCN101640423ASimplify Parallel CombinationAutomatically eliminate voltage pulsationSingle network parallel feeding arrangementsWind energy generationPhase currentsCapacitance
The invention discloses a generator system for wind power generation and a variable speed control method; the system comprises a permanent magnetic synchronous generator of which the electrical energyoutput is connected with a Vienna rectifier device, and is characterized in that a stator winding of the permanent magnetic synchronous generator comprises two sets of triphase windings with electrical degree difference of 180 degrees and unconnected neutral points thereof; the Vienna rectifier device comprises two Vienna rectifiers with identical structure, which are in parallel connection withthe DC side with a central point O connected with a DC bus capacitance midpoint; the AC side is connected with the two triphase windings of the generator respectively; a Boost inductance of the Viennarectifier is directly provided by the leakage inductance of the windings of the generator; each Vienna rectifier device is controlled by a DSP controller to maintain the balance of the DC bus voltageby the phase current and line voltage collected in the AC side and the bus voltage collected in the DC side; and the variable speed control of the generator is realized by collecting the rotating speed of a fan and the current wind speed.
Owner:XI AN JIAOTONG UNIV

Control method of drive system, drive system and new energy vehicle

The invention discloses a control method of a drive system, the drive system, and a new energy vehicle. The method obtains a current temperature value of a power battery in real time; when the temperature value is lower than a first preset temperature threshold, the temperature is raised to restore the drive capability of the drive system. A motor controller applies a periodic alternating voltagevector to a motor, the voltage vector is utilized to modulate bus current of a power battery to alternate, and during the process, the battery is driven to be repeatedly charged and discharged periodically to increase the temperature of the battery. Until the temperature value reaches a second preset temperature threshold, the battery is warmed to a desired operating temperature and the motor controller stops applying the voltage vector. Three-phase winding of the motor and three sets of bridge arms are used during the heating of the power battery. The recovery of the drive capability of the drive system is more economical without the need for additional external heating equipment. During the entire process of applying the voltage vector, the power battery is continuously and uniformly heated, the battery heating efficiency is very high, and rapid recovery of the drive capability is achieved.
Owner:SAIC MOTOR

Counter-potential zero-crossing detection circuit and counter-potential zero-crossing detection method for brushless direct-current motor

The invention discloses a counter-potential zero-crossing detection circuit and a counter-potential zero-crossing detection method for a brushless direct-current motor, wherein in the counter-potential zero-crossing detection circuit for the brushless direct-current motor, a three-phase winding of the brushless direct-current motor is connected with a direct-current power supply via a bridge-type inverter, and the bridge-type inverter is formed by connecting six power switch tubes; the counter-potential zero-crossing detection circuit is characterized by comprising three detection modules used for detecting the counter-potential zero crossing of a phase A, a phase B and a phase C, and provided with the same structure; and each detection module comprises a comparator, and two electronic switch voltage-dividing module provided with the same structure and same circuit parameters. Via the counter-potential zero-crossing detection circuit and the counter-potential zero-crossing detection method disclosed by the invention, the danger that a counter-potential amplitude value is greater than the power supply voltage value of the detection circuit in case of high speed can be avoided. Simultaneously, as a mode that low-speed-area counter-potential sampling and high-speed-area counter-potential sampling are switched by controlling the signal duty ratio is adopted, the counter-potential zero-crossing detection effect in a low-speed area can be effectively improved. Experimental results indicate that the counter-potential zero-crossing detection circuit and the counter-potential zero-crossing detection method for the brushless direct-current motor can ensure the working of the motor within a relatively wide rotational speed range.
Owner:CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY

Novel electric vehicle drive system of integrating charger functions

The invention discloses a novel electric vehicle drive system of integrating charger functions. A motor driver and a charger share a power electronic conversion circuit between energy storage units, and also share a motor winding inductor, so that an electric vehicle motor driver and an on-board charger are organically integrated into a whole; and the limitation of an electric vehicle on the space weight is avoided. Double three-phase motors meet the low-voltage and high-current design requirements of electric vehicle motors, have relatively small torque ripples, meet the comfortable and smooth operating requirements of the electric vehicle, have relatively good fault tolerant capability and meet the high-reliability operating requirements of the electric vehicle. Permanent magnets NdFeB and AlNiCo are organically compounded on a rotor, so that the novel electric vehicle drive system has the advantage that the magnetic field of the permanent magnet AlNiCo is easy to adjust; the characteristic of high energy density of the permanent magnet NdFeB is reserved; the large starting torque and flux-weakening speed expansion operating requirements of the electric vehicle are met; the double three-phase windings can provide a torque current and a magnetization current respectively; and the magnetization efficiency is relatively high.
Owner:SOUTHEAST UNIV

Stator of alternating-current generator and winding method thereof

The invention discloses a stator of an alternating-current generator and a winding method thereof. The stator comprises an iron core and a stator winding wound on the iron core, wherein 108 rectangular grooves are formed on the iron core at equal intervals; groove insulating paper which is matched with each rectangular groove is paved in the rectangular groove along the wall of the rectangular groove; the rectangular grooves are distributed in four layers according to inner stator coils, including an inner upper layer, an inner lower layer, an outer lower layer and an outer upper layer in sequence from inside to outside along the radial direction of the iron core; the stator winding is a three-phase winding; the number P of magnetic pole pairs is equal to 6; the quantity q of grooves on each phase at each pole is equal to 3; the coil of each phase can be partitioned into three coil groups; and the stator coil of each phase comprises thirty-three upper coils, thirty-three lower coils, three middle spanning coils, two connection spanning coils and two winding outgoing lines. According to the invention, the problem of conflict between the generator size and the generating amount in the prior art is solved; and the stator has the characteristics of compact structure and high output power, and is suitable for other generators needing high power such as automobiles and the like.
Owner:FUJIAN YIDA ELECTRIC DRIVE CO LTD

Multiphase permanent magnet motor speed regulating system based on phase switching and speed regulating method thereof

InactiveCN104167975AReduce back EMFAvoid the risk of demagnetizationAC motor controlPermanent magnet motorConductor Coil
The invention discloses a multiphase permanent magnet motor speed regulating system based on phase switching and a speed regulating method thereof. The multiphase permanent magnet motor speed regulating system comprises a first inverter, a second inverter, a change-over circuit, a first circuit breaker, a second circuit breaker and a multiphase permanent magnet motor. The multiphase permanent magnet motor is of a structure including two three-phase windings. The three-phase output end of the first inverter is respectively connected with the three-phase positive end of the first winding of the motor, the three-phase negative end of the first winding is respectively connected with the three-phase positive end of the second winding of the motor, and the three-phase negative end of the second winding is respectively connected with the three-phase output end of the second inverter. The first inverter and the second inverter are respectively powered on by two independent direct current power supplies, the first circuit breaker and the second circuit breaker are respectively arranged at the low potential ends of direct current buses of the first inverter and the second inverter. The change-over circuit is used for adjusting connecting modes of the first winding and the second winding so as to adjust counter potential of the motor. The multiphase permanent magnet motor speed regulating system can widen a speed regulating range and improve speed regulating flexibility of the permanent magnet motor and the error-tolerant rate.
Owner:HUAZHONG UNIV OF SCI & TECH

Parameter off-line identifying method and device of three-phase asynchronous motor

The invention discloses a parameter off-line identifying method of a three-phase asynchronous motor. Through the current output by an inverter, the connecting method of the three-phase winding of a motor is equivalent to the terminal current of a phase winding, which is detected by a sensor when any two phase windings are connected in parallel and then are connected with the other phase winding in series every time, thereby obtaining the direct voltage and the direct current or the alternating current voltage and the alternating current of the motor winding; the impedance of reverse gamma equivalent circuit of the motor is calculated by the alternating voltage and the alternating current, and then the equivalent rotor resistance, the total leakage inductance and the equivalent mutual induction parameter of the motor are calculated by two impedances under the condition of different frequencies omega 1 and omega 2. The method disclosed in the invention can indentify the motor parameter without the rotation of the motor, thereby avoiding the empty load test required in the process of identifying parameters in prior arts, enlarging the application scope of indentifying the motor parameter and improving the accuracy of the identified motor parameters. The method and the device of the invention are applicable to the motor parameter off-line identification of a three-phase asynchronous motor speed control system controlled by an inverter.
Owner:CHANGZHOU LIANLI AUTOMATION TECH +1

Method for testing parameters of synchronous motor and device for achieving same

The invention provides a method for testing parameters of a synchronous motor and a device for achieving the same, which relate to the field of motor tests. The method and the device solve the problems of low testing accuracy of quadrature and direct axis inductance parameters, complex method for testing moment coefficient, and strong dependency on driver performance in the prior method. The method comprises the following steps: energizing any two phases in three phases of windings of a tested synchronous motor with single-phase alternating current (square root 2I sin omega t), driving a rotor of the tested synchronous motor with an external force to rotate at a uniform speed for at least one revolution, testing voltage signals at two ends of the energized windings, and obtaining the quadrature axis and direct axis inductances of Lq and Ld respectively of the tested synchronous motor according to the voltage signals; and energizing any two phases of the three phases of the windings of the tested synchronous motor with direct current I1, driving the motor of the tested synchronous motor with the external force to rotate at a uniform speed for at least one revolution, and calculating the moment coefficient KT of the tested synchronous motor according to the tested maximum moment value Tmax1. The method and the device are applied to the field of testing the parameters of the synchronous motor.
Owner:HARBIN INST OF TECH

Commutation torque ripple suppression method for permanent magnet brushless DC motor

InactiveCN102163947AImplement controlCommutation Torque Ripple SuppressionTorque ripple controlControl signalElectric machine
The invention belongs to the technical field of motor control, and relates to a commutation torque ripple suppression method for a permanent magnet brushless DC motor. The method comprises the following steps of: detecting a rising edge or falling edge of a Hall signal, starting commutation, and executing the commutation torque ripple suppression method; acquiring a non-commutation current sampling value and a motor running speed at a current moment; calculating back electromotive forces of phases of a three-phase winding at the next moment according to the motor running speed and a commutation mode respectively; obtaining the voltages to power earth of end points of the three-phase winding in different inverter circuit switching-on states at the next moment respectively; predicting predicted values of non-commutation current in the different inverter circuit switching-on states at the next moment respectively; performing estimation on the predicted values of the non-commutation current in the different inverter circuit switching-on states by utilizing a value function; selecting the inverter circuit switching-on state in which the value function has the smallest value as the inverter circuit switching-on state of the next moment, and generating a corresponding inverter circuit control signal; and detecting the current of a corresponding switched-off phase is reduced to zero, finishing the commutation process, and stopping the commutation torque ripple suppression method. By the method, the commutation process can be accurately determined, and control over the inverter circuit switching-on state can be realized relatively better at the moment of commutation to realize commutation torque ripple suppression.
Owner:TIANJIN UNIV

Transformer winding deformation fault diagnosis method based on frequency sweep short circuit characteristics

The invention relates to a transformer winding deformation fault diagnosis method based on frequency sweep short circuit characteristics. The transformer winding deformation fault diagnosis method comprises the following steps: 1) measuring frequency sweep short circuit impedance data of a transformer three-phase winding through a testing device under the power failure state of a transformer; 2) obtaining three diversity factor curves of the frequency sweep short circuit impedance data of the three-phase winding measured in step 1); 3) comparing three diversity factor curves DAB, DBC and DCA calculated from step 2) with standard diversity factor curves, diagnosing that the winding has slightly deformation when any one diversity factor curve exceeds attention value curves of the standard diversity factor curves; otherwise diagnosing that the winding has no deformation; and if the diversity factor curves exceed alarm value curves of the standard diversity factor curves, diagnosing that the winding has obvious deformation. The transformer winding deformation fault diagnosis method is accurate and sensitive to diagnose, easy to implement, and strong in field maneuverability and can be widely applied to fault diagnosis of transformer winding.
Owner:CHINA ELECTRIC POWER RES INST

Wave straightly-drive type straight-line magneto resistance power generation system

InactiveCN101355284ASolve the problem of low secondary energy conversion efficiencyAvoid corrosionElectronic commutation motor controlMagnetic circuit rotating partsEngineeringElectric generator
The invention discloses a wave direct-drive linear reluctance generator system which comprises a generator, a power inverter, and an inverter, wherein the output of a primary three-phase winding of the generator is connected with the input of the power inverter, the output of the power inverter is connected with the inverter, and the output of the inverter is connected with a power grid or a use load. The system is characterized in that the generator is a direct-drive linear switched reluctance generator which comprises a primary iron core embedded with a three-phase winding and a secondary mover which is arranged in the primary iron core and is provided with tooth grooves, the primary iron core and the secondary mover are formed by overlapping silicon sheets, the lower end of the secondary mover is fixed on a generator base through an elastic component, and the upper end of the secondary mover is elastically connected with a wave energy absorbing device. The system replaces a permanent-magnet synchronous linear motor with the linear switched reluctance generator, which saves a secondary energy conversion device, can simplify the structure and the volume of the generator system, improve the efficiency of wave energy power generation, and also avoid problems of corrosion and excitation loss of permanent magnets and so on.
Owner:XI AN JIAOTONG UNIV

Direct-driving electric excitation double-salient pole fault-tolerance aerogenerator

A direct-driven electric excitation double convex pole fault-tolerant wind-driven generator belongs to the wind-driven generator. The wind-driven generator is composed of two parts of a multi-pole electric excitation double convex pole electric motor and a power device. The unit electric motor are divided into C groups (C>=3). The number of each group of unit electric motor is same. The three-phase winding of each group of unit electric motor is inverted to 120 degree step wave alternating current by the full-bridge inverter respectively after the commutation of the rectification circuit. The phase displacement between the step wave alternating current outputted by the inverters of each group of unit electric motor is 90 / C degree electrical degree. When the outputs of inverter of each group of unit electric motor have been series-connected the load is provided with alternating current, the generator can still work normally after the occurring of fault and satisfies the high-reliability request of the wind-driven generator and at the same time has the advantages of low switching frequency of the amplifier tube of the inverter, small electric voltage and current stress, small distortion factor of the power-line voltage and small cubic weight.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Single-winding non-bearing magnetic flux switching permanent magnetic motor

The invention belongs to the technical field of a motor, and relates to a single-winding non-bearing magnetic flux switching permanent magnetic motor. The single-winding non-bearing magnetic flux switching permanent magnetic motor comprises a stator iron core, a rotator iron core, permanent magnets embedded in the middle of stator teeth, and concentrated windings. A stator and a rotor are both of double-salient pole structures. The single-winding non-bearing magnetic flux switching permanent magnetic motor is characterized in that the stator iron core is composed of six U-shaped laminations; a permanent magnet capable of tangential alternative magnetizing is embedded between every two laminations so that a stator tooth which is axisymmetric is formed; the stator teeth are provided with the concentrated windings, the end portions of the windings are quite small, and the windings, which are opposite to each other in terms of space, on two stator teeth form a phase so that a three-phase winding is formed; and the excitation of winding currents is of a radial excitation mode, each winding is independently controlled, the winding currents can perform bidirectional flow in positive and negative directions, the current size can be controlled according to needs, and the currents has the same phase as a back electromotive force. The single-winding non-bearing magnetic flux switching permanent magnetic motor has the advantages of high speed, large power, high efficiency, high power density, high operation stability, high reliability, and adaptability to an AC operation mode.
Owner:TIANJIN UNIV

Method for diagnosing deformation of transformer winding based on frequency response characteristics

ActiveCN101833056AEasy to diagnoseEasy implementation of diagnostic methodsElectrical testingFingerprintThree phase windings
The invention relates to a method for diagnosing deformation of a transformer winding based on frequency response characteristics. The method comprises the following steps of: (1) respectively acquiring a frequency response fingerprint of a winding to be diagnosed of a three-phase winding at the same voltage side of a transformer and an original frequency response fingerprint thereof; (2) judging characteristic points of the frequency response fingerprint of the winding to be diagnosed and the original frequency response fingerprint; (3) calculating amplitude difference factors of all characteristics on the original frequency response fingerprint; (4) calculating frequency difference factors of all characteristics points on the original frequency response fingerprint; (5) obtaining characteristic difference factors of the original frequency response fingerprint and the frequency response fingerprint of the winding to be diagnosed according to the amplitude difference factors and the frequency difference factors; and (6) judging whether the transformer winding generates deformation or not according to a characteristic difference factor judgment criterion. In the invention, whether the transformer winding generates the deformation or not is judged according to the characteristic points of the frequency response fingerprint of the transformer winding, therefore, whether the transformer winding generates the deformations or not can be accurately judged independent of experiences of professional staff. The invention can be not only applied to the analysis of frequency response fingerprint data, but also applied in the analysis of other similar data.
Owner:CHINA ELECTRIC POWER RES INST +1
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