52 results about "Phase inductance" patented technology

The invention discloses a position sensorless control method for a switched reluctance motor, and belongs to the technical field of motor control. According to the method, current chopping control is carried out in a conduction interval, low-threshold chopping control is carried out in a non-conduction interval, and the current hysteresis width changes along with the rotation speed, so that the rotor position estimation precision when the rotation speed is increased is ensured. According to the method, current information of each phase is collected, a current slope difference value is calculated, three-phase inductance is obtained through calculation according to the current slope difference value, the inductance obtained through calculation is compared with a preset inductance threshold value, and on-off signals of each phase and pulse signals of special position points can be obtained. According to the time interval between the rising edges of the adjacent position pulse signals and the corresponding rotor position angle difference value, the real-time rotating speed of the motor is obtained through calculation, and the motor rotor position at any moment is estimated. The method is simple in structure and convenient to implement, is not affected by inductance saturation, and is high in position estimation reliability and universality.

The utility model relates to motor driver test technical field discloses motor driver test load and motor driver testing arrangement, the motor driver test load includes: three -phase inductance load, three -phase inductance load includes a plurality of three -phase test end, wherein, the load between each three -phase test end is different, the motor driver to be tested is connected with target three -phase test end of three -phase inductance load, carries out the test based on target three -phase test end corresponding load, temperature sensor sets up in three -phase inductance load, gathers three -phase inductance load's temperature signal and exports, control unit is connected with temperature sensor, receives temperature signal, and when temperature signal is higher than temperature threshold value, exports cooling signal, cooling unit sets up in three -phase inductance load, cooling unit is connected with control unit, receives cooling signal and starts and reduces three -phase inductance load's temperature. The utility model solves the problem that the existing test motor driver's load commonality is low.

The invention relates to a method, a device and equipment for determining the operation condition of a switched reluctance motor. The method includes obtaining a first data set of phase inductance, phase current, and rotor angle for the switched reluctance motor. The method further includes expanding the first data set into a second data set by the neural network model, the phase inductance in the second data set being associated with the flux linkage of the switched reluctance motor, the flux linkage being used to determine the operating condition of the switched reluctance motor. Through the mode, the data sets of the phase inductance, the phase current and the rotor angle can be expanded based on the neural network model, the situation that only the switched reluctance motor is observed to collect data is avoided, the data size of the data sets is increased, the collection cost of the data sets is reduced, and therefore the accuracy of the flux linkage and the operation condition is improved; and thus, the control accuracy of the switched reluctance motor is improved.

The utility model provides a single-phase inductor insulation resistance test fixture, the whole test fixture is of a hollow cuboid structure, and a single-phase inductor is placed in the test fixture; the single-phase inductor comprises two terminal endpoints and a middle magnet, probes are arranged at the positions, corresponding to the two terminal endpoints, of the top and the bottom of one side face of the testing jig, conducting layers making contact with the magnet are arranged on the inner walls of the two side faces of the testing jig, the conducting layers on one sides of the terminal endpoints transversely penetrate through the side faces, and the conducting layers on the other sides of the terminal endpoints transversely penetrate through the middle magnet. The other side surface is fully covered with a conductive layer; connecting wires are led out of the probe and the conductive layer and are inserted into insulation resistance testing equipment. According to the utility model, through the structural design of the test tool, especially the arrangement of the conductive layer, the insulation resistance of the inductor can be tested at one time, so that the test efficiency can be improved, the test accuracy can be improved, and the risk that defective products flow out is greatly reduced; the jig is simple in structure, convenient to use and wide in application range, and the test difficulty can be reduced.

The invention relates to the technical field of buck-boost converters, and discloses a phase control circuit and method, and a buck-boost system. According to the phase control circuit provided by the embodiment of the invention, the edge change rate of the phase-cut inductive current is slowed down by processing the phase-cut signal, so that when the double-phase reverse buck-boost converter performs phase cutting based on the phase-cut signal, one single-phase buck-boost converter can enter or exit softly, and the other single-phase buck-boost converter can enter or exit softly. Therefore, the ripple of the load voltage signal at the output end of the dual-phase reverse buck-boost converter is ensured to meet the design requirement, and the load connected with the dual-phase reverse buck-boost converter is prevented from working abnormally.

This invention belongs to the field of power electronics and electric vehicle charging technology, and discloses a bidirectional electric vehicle charger topology, control method, and system, including a grid-side module, an AC-DC module, and a DC-DC converter. The grid-side module includes a three-phase power supply from the grid, a first-phase resistor Rga, a second-phase resistor Rgb, and a third-phase resistor Rgc. The AC-DC module includes a power switching transistor group, a first capacitor C1, and a second capacitor C2. The three-phase output terminals of the grid power supply are respectively connected to the first-phase inductor Lga, the second-phase inductor Lgb, and the third-phase inductor Lgc. This invention eliminates the need for additional filtering hardware, reducing manufacturing costs, physical size, and system complexity, while improving power density and reliability. It can accurately locate and specifically compensate for critical harmonics of specific orders in the power grid, and can quickly and in real-time track and suppress dynamically changing harmonics and transient disturbances.

The application discloses a kind of three-phase rectifier multiple switch tube open-circuit fault diagnosis methods based on voltage deviation, belong to power electronic converter fault diagnosis technical field.Method includes: obtaining relevant signal for diagnosis;According to three-phase voltage, three-phase current, three-phase inductance value, three-phase equivalent resistance value and switching period, the actual value of three-phase line voltage is calculated;According to DC voltage and the duty cycle of switch tube on three-phase bridge arm, the expected value of three-phase line voltage is calculated;Difference is obtained between the expected value and actual value of three-phase line voltage;The deviation value of three-phase line voltage is compared with first preset threshold and second preset threshold, to determine the polarity of the deviation value of three-phase line voltage;Wherein, first preset threshold is less than second preset threshold;The polarity of the deviation value of three-phase line voltage is combined with voltage phase, to determine fault switch tube.The application can quickly diagnose for various situations of multiple switch tube fault, including single switch fault, two switch tubes in succession fault, two switch tubes simultaneous fault.

The application provides a vertical-axis phase-synchronous pulse injection control method for a hybrid excitation variable reluctance motor, and belongs to the technical field of motor control. The method comprises the following steps: S1, configuring a hybrid excitation variable reluctance motor, which comprises two sub-phase components, and each sub-phase component is powered by a three-phase four-bridge-arm inverter; S2, constructing a self-induction model under pulse detection signal excitation based on the structure of the hybrid excitation variable reluctance motor; S3, sequentially injecting detection pulse voltages into each phase by adopting the vertical-axis phase-synchronous pulse injection method, obtaining the size of the inductance value of each phase, thereby judging the current sector where the rotor is located, and substituting the bias electric angle into the self-induction model to calculate the bias electric angle; and S4, calculating the electric angle of the rotor magnetic field at the current moment according to the bias electric angle.

The invention discloses a pre-synchronization grid-connection method for a grid-construction type converter under an unbalanced power grid, and the method comprises the steps: 1, obtaining the positive-sequence components and negative-sequence components of three-phase grid-connection point voltage, three-phase output current, three-phase output voltage and three-phase inductive current; step 2, determining the positive sequence amplitude and the negative sequence amplitude of the grid-connected point voltage; step 3, generating a negative sequence voltage given value of the network construction type converter; step 4, determining a positive sequence voltage given value, a positive sequence voltage frequency value and a positive sequence voltage phase value of the network construction type converter; 5, performing double-loop control of positive sequence voltage and positive sequence current and double-loop control of negative sequence voltage and negative sequence current on the voltage output by the grid-forming converter and the positive sequence component of the inductive current; and step 6, judging whether a grid connection condition is met, and if yes, ending pre-synchronization. The problem of failure of pre-synchronization grid connection of the grid-forming converter under the three-phase unbalanced power grid is solved.

The application discloses a four-phase different-name end coupling magnetic integrated inductor, which comprises an upper cover plate, a lower cover plate, four magnetic columns and four windings; the upper cover plate and the lower cover plate are of the same shape, and the four magnetic columns are of the same shape; the four magnetic columns are uniformly distributed in a horizontal direction around a vertical connecting line of a center point of the upper cover plate and a center point of the lower cover plate; the upper cover plate covers upper surfaces of the four magnetic columns, and the lower cover plate covers lower surfaces of the four magnetic columns; the four-phase different-name end coupling magnetic integrated inductor further comprises a partition air gap; the four windings are of the same structure and are wound on the four magnetic columns respectively to form four-phase inductors which are magnetically coupled; after current excitation is applied to the four windings, magnetic fluxes generated in the four magnetic columns are of the same direction. The four-phase winding different-name end coupling makes the magnetic fluxes generated in the upper cover plate of the magnetic core and the lower cover plate of the magnetic core have the same direction, so that the four-phase inductors can be reduced to a certain extent. The four-phase different-name end coupling magnetic integrated inductor is favorable for reducing inductance current ripple and in turn reducing winding loss, and can improve current uniformity and rated value of the four-phase inductors.

The invention discloses a three-phase switched reluctance motor torque control method based on alignment position detection, and relates to the technical field of motor control. Injecting a high-frequency current pulse into a non-conducting phase of which the inductance is monotonically changed along with the position in each position sector taking two adjacent aligned positions as end points, and ensuring that the non-conducting phase has no tail current before injection; estimating the inductance of the non-conducting phase according to the rising slope of the high-frequency current pulse injected into the non-conducting phase or the falling slope of the trailing current; if the inductance is smaller than the preset threshold value, instantaneous torque control based on a torque distribution function is adopted according to the inductance estimation position; otherwise, not estimating the position, neglecting the change of the conduction phase torque along with the position, and determining the conduction phase given current according to the current-torque characteristic at the 60-degree electrical angle position. As only the alignment position needs to be detected and the instantaneous torque control area is expanded, compared with the technology that instantaneous torque control is adopted only in the two-phase conduction area, the cost of the position sensor can be reduced, and torque pulsation can be restrained.

This utility model discloses a three-phase inductor, including a three-phase magnetic core structure, corresponding winding structures, and lower and upper mounting brackets respectively disposed at the upper and lower ends of the three-phase magnetic core structure. The lower mounting bracket is provided with a first positioning component that positions and cooperates with the bottom of each phase magnetic core, which is composed of multiple lower positioning plates arranged circumferentially around the bottom of the magnetic core. The upper mounting bracket is provided with a second positioning component that positions and cooperates with the top of each phase magnetic core, the second positioning component including an upper positioning cover that covers the top of the magnetic core. By connecting the upper and lower mounting brackets through multiple sets of locking components and applying opposing overall clamping forces, the magnetic core is rigidly fixed. The three-phase inductor with this structure design effectively ensures the coaxiality of the three-phase magnetic core by synchronously constraining the radial movement and axial displacement of the magnetic core structure through bidirectional positioning, ensuring the stable electrical performance of the inductor, improving production and assembly efficiency, and saving installation space.

The invention belongs to the technical field of inductance equipment manufacturing, and particularly relates to a three-phase inductance coil winding device and method. Comprising a base, and a driving roller and two driven rollers are mounted at the top of the base; a magnetic ring is connected between the driving roller and the two driven rollers in an abutting mode. A first electric telescopic rod is further installed at the top of the base and located below the magnetic ring, and a wire hook is fixedly arranged at the end of the first electric telescopic rod. According to the invention, the problems of complex process and low efficiency caused by repeated winding and repeated cutting during preparation of the three-phase inductance coil can be avoided through one-time forming, and meanwhile, the magnetic ring is not damaged; the device can quickly adapt to the size change of the magnetic ring and the operation of the rollers, the problem that the magnetic ring cannot rotate due to inaccurate adjustment caused by respective adjustment of the rollers is solved, the device can be quickly reset, and the fine adjustment efficiency is greatly improved; the multi-coil winding and cutting device is suitable for large-current multi-coil winding and cutting at the same time.

The application discloses a kind of non-fault phase continuous power supply three-phase inverter short-circuit current limiting method and system, belong to independent power supply system protection control field.The system described in the application includes normal control system and fault control system, normal control system includes capacitor voltage outer ring, fault control system includes non-fault phase capacitor voltage outer ring and adaptive phase angle adjusting link based on SOGI filter, both are connected with inductance current inner ring by switching module.The application has the advantages of fast current limiting response speed, simple control structure compared with existing strategy.When asymmetric fault occurs, the output current of fault phase can be maximized and the reliable power supply of non-fault load of the system can be ensured.The application can adaptively change the phase angle between fault and non-fault inductance current, which can make the inverter always meet the system power supply and current limiting requirements with good robustness.

The invention discloses a low-ripple hydrogen production power supply based on a pseudo-continuous multi-phase interleaving parallel converter, which relates to the technical field of water electrolysis hydrogen production and comprises a direct-current power supply, an electrolytic bath, a three-phase interleaving parallel Buck power unit and three pseudo-continuous follow current branches, the three pseudo continuous follow current branches are respectively connected between three-phase switch nodes and output ends of the three-phase staggered parallel Buck power unit, and the pseudo continuous follow current branches adopt follow current switch devices and are used for conducting and connecting the switch nodes and the output ends in a follow current stage, so that voltages at two ends of a phase inductor are approximately zero; and the input end and the output end of the three-phase interleaving Buck power unit are respectively connected with a direct-current power supply and an electrolytic bath. Wide-working-condition low-ripple output can be achieved under the condition that the size of the output filter is not remarkably increased, the operation efficiency of the electrolytic cell is improved, the service life of the electrolytic cell is prolonged, and the requirements of a large-scale hydrogen production system for a high-reliability and high-efficiency power source are met.

The application discloses a sensor multiplexing current tracking control method and device and related equipment, and the method comprises the following steps: acquiring a reference current output by a measured transformer, and collecting total inductance currents of n-phase interleaved transformers; the total inductance current is the sum of all inductance currents corresponding to n parallel half-bridge circuits; calculating a total current error between the total inductance current and the reference current; for each phase in the n phases, based on the total current error and the actual sampling value of the inductance current, a coupling reference value corresponding to the inductance current of each phase is generated; according to the coupling reference value, the duty cycle of the lower switch in each phase half-bridge circuit is calculated; based on the duty cycle calculated for each phase, the on-off state of the upper switch and the lower switch of the corresponding phase half-bridge circuit is controlled respectively, so that the total inductance current tracks the reference current. By introducing the coupling reference value based on the total current error, the current tracking speed and accuracy of the multi-phase interleaved transformer are improved.

The invention relates to the technical field of power electronic technology simulation modeling, and discloses a new energy converter modeling method and device, and the method comprises the steps: building a primary topological structure diagram of a converter in a mode of replacing the converter with a controlled voltage source; based on the energy balance relation of the flexible DC converter, virtual DC bus voltage is constructed; based on the electrical parameters of the primary topological structure and the virtual direct current bus voltage, a three-phase modulation wave is obtained in a closed-loop control mode; and after the three-phase modulation wave is subjected to delay control, a control signal of the controlled voltage source is obtained. According to the new energy converter modeling method, a controlled voltage source is used for replacing a traditional switching device, a nonlinear link of the model is removed, the simulation calculation amount is greatly reduced, the simulation step length can be increased, the simulation speed of a large-scale new energy station current collection system is remarkably increased, and the situation that the simulation software electrical node containing limit is exceeded is avoided. Meanwhile, the filter circuit is simplified into a three-phase inductance structure, electrical nodes are further simplified, and system-level integration simulation requirements are met.

The utility model discloses a testing device for a three-phase inductor, and relates to the technical field of inductor testing. The device comprises a base and a material receiving drawer, the material receiving drawer is arranged in the base, clamping type placing assemblies are fixedly installed on the two sides in the base, a three-phase inductor body is fixedly clamped in the clamping type placing assemblies, a fixing frame is fixed to the top of the base, and a sliding groove is formed in the inner wall of the top of the fixing frame. A detachable mobile test assembly is fixedly installed on one side in the sliding groove. According to the utility model, through the clamping type placing assembly, three-phase inductor main bodies of different models can be clamped and fixed, the test accuracy is guaranteed, unqualified three-phase inductor main bodies can be rapidly removed, a plurality of three-phase inductor main bodies can be tested by using the detachable mobile test assembly, and the test efficiency is improved. The testing efficiency is improved, the testing head can be disassembled, assembled and replaced, and the use is more convenient.

The invention discloses a power system subsynchronous resonance energy recovery device and method, and belongs to the technical field of power systems. The device comprises a band-pass filtering unit, a bypass switch unit, a three-phase monitoring unit, a control unit, a three-phase thyristor full-bridge circuit and a three-phase inductance energy storage module. The band-pass filtering unit is connected in parallel to a unit outlet bus, and the bypass switch unit is connected in parallel to two ends of the filtering unit to realize time-sharing switching; and the control unit identifies resonance according to the monitoring signal and controls the thyristor full-bridge circuit to be switched between a rectification mode and an inversion mode. The method comprises the following steps: bypass filtering in standby, and monitoring power frequency; when resonance exceeds a threshold value, filtering and rectifying energy storage are carried out; after resonance is eliminated, bypass filtering is carried out, and inversion feedback energy is sent to a power grid. According to the invention, through cooperation of the pre-filtering and the bypass switch, precise detection, rapid suppression and energy loss-free recycling of subsynchronous resonance are realized, and the system economy and the equipment reliability are greatly improved.

The application discloses a high-frequency AC coupling-based flexible interconnection switch structure of a medium-high voltage AC-DC hybrid power distribution network, which comprises two groups of high-frequency AC coupling type modular multilevel converters and a phase-shifted inductor. Each group of the modular multilevel converters adopts a three-phase six-bridge-arm structure and has three power ports of medium voltage DC, medium voltage AC and high-frequency AC; a sub-module of the modular multilevel converter adopts a half-bridge structure; an isolation stage is formed by a full-bridge module and a high-frequency transformer to form a high-frequency AC bus in an AC form at the output end of the high-frequency transformer of each sub-module, so that the coupling offset of low-frequency fluctuation current of the sub-module and the autonomous clamping of the capacitor voltage are realized, and the capacitor volume of the sub-module and the system control strategy are greatly optimized. The phase-shifted inductor is connected between the high-frequency AC buses of the two groups of the modular multilevel converters to form a double active bridge converter structure, and through high-frequency coupling, bidirectional energy transmission between two different voltage grade AC power grids with different working frequencies can be realized. The application can realize the flexible interconnection of the medium-high voltage AC power distribution network, has the advantages of sub-module capacitor voltage self-balancing, high power density and simple control structure.

The application provides a bidirectional DC-DC converter, which can realize DC bus voltage operation in a wide range of boost / buck voltage ratio and inductance current balance, and further improve the voltage ratio and output power. The bidirectional DC-DC converter is composed of a pair of two-phase interleaved charge pump. The positive and negative poles of the low-voltage side of each DC-DC converter are connected in parallel with the low-voltage side DC bus, and one end of the high-voltage side is connected with the positive and negative poles of the high-voltage side DC bus, respectively, and the other end is in a floating state. The high-voltage side voltage is the voltage formed by the superposition of the charge pump capacitor voltage of each DC-DC converter and the low-voltage side voltage. In the driving circuit (2), the error amplification value of the synthesized value of the four-phase inductance current and the reference value is asymmetrically set to the upper limit or lower limit limit value of the duty cycle of the driving pulse of the part switch as the control object in the buck mode / boost mode, respectively.

The invention discloses an equivalent three-level SVPWM small vector midpoint control method and system, and the method comprises the steps: enabling an energy storage converter to output a three-phase modulation wave and a carrier wave in real time, converting the three-phase modulation wave into a positive modulation wave and a negative modulation wave, and converting the carrier wave into dual carriers; obtaining a three-phase inductive current and a positive capacitance voltage and a negative capacitance voltage of the DC bus, calculating a voltage difference between the positive capacitance voltage and the negative capacitance voltage, and carrying out moving average filtering on the voltage difference to obtain a DC voltage deviation; whether the direct-current voltage deviation reaches a set threshold value or not is judged, and if not, amplitude limiting processing is directly conducted on the positive modulation wave and the negative modulation wave; if so, executing a midpoint control strategy, and then carrying out amplitude limiting processing on the positive modulation wave and the negative modulation wave; and comparing the positive modulation wave and the negative modulation wave after amplitude limiting with double carriers, and generating a PWM wave to drive a switching device. According to the invention, the control of the neutral-point voltage can be effectively realized in an equivalent SVPWM mode.

The application is a kind of multi-phase high-precision current-sharing control method applied to constant on-time control, which obtains the on-time adjustment quantity by PI compensation module and low-pass filter module from the current difference quantity of continuous sampling of each phase current and average current, the high bit of the adjustment quantity controls the value of the reference value V of the counter in the on-time control module, and the low bit controls the length of the enabled delay line in the delay line module, the counter timing control of the on-time control module is combined with the delay line timing control of the delay line module to improve the control precision of the digital pulse width modulator. ref Compared with the multi-phase COT controller without current-sharing mechanism, the application can ensure the direct current quantity of each phase inductor current consistent and improve the stability and reliability of the system under the steady-state operation condition.

The invention discloses a motor parameter detection method based on frequency domain analysis and related equipment. The method comprises the following steps: inputting a first voltage signal to a specified phase of a motor based on a preset rule, and determining a second voltage signal which enables the motor to be in a linear region in the first voltage signal; inputting an injection voltage signal determined based on the second voltage signal to the designated phase when the motor is in the linear region; acquiring a current response signal for the injection voltage signal in the specified phase; dividing the current response signal into multiple segments of current response data based on the frequency of the injection voltage signal; the current response data comprises the injection voltage signal and the current response signal corresponding to the frequency; and determining the motor parameters based on the multiple segments of current response data, wherein the motor parameters comprise a phase resistance value and / or a phase inductance value of the motor. The accuracy of motor parameter detection can be improved, and accurate control over the motor is facilitated.

The invention discloses a three-phase high-speed super-energy alternating current motor and an inversion high-speed super-energy electric drive engine. According to the invention, a three-phase-to-single-phase inductance sine wave super-energy alternating current excitation driving power supply power forming circuit and an inversion capacitance inductance single-phase sine wave super-energy alternating current excitation driving power supply power forming circuit are designed; high-speed or multiple-speed or overspeed or very-speed rotation driving power combined energy with multiple electromagnetic driving structure types of double-stator / middle-inductance rotor type, double-stator / middle-constant-magnetic rotor type, multi-group disc inductance rotor type and double-stator / multi-disc rotor type which are powered by the three-phase or inversion single-phase sine wave super-energy alternating-current excitation power supply is designed at the same time; and the combined energy has high-speed or multiple-speed or overspeed or very-speed rotation driving power combined energy with multiple electromagnetic driving structure types of the three-phase or inversion single-phase sine wave super-energy alternating-current excitation power supply. The three-phase high-speed super-energy alternating-current motor and the inversion high-speed super-energy electric drive engine are used for mutual inductance or magnetic induction super-energy alternating-current power generation at the same time.

The invention provides a dual-two-phase modular integer slot winding permanent magnet fault-tolerant motor, and belongs to the technical field of motors. The stator core is divided into two sections of independent modules along the axial direction, and only two phases of windings are embedded in each section, so that when a certain phase or even the whole module breaks down, the fault can be strictly limited in a single module, and the continuous operation capability of the motor under the fault is ensured; and meanwhile, the number of series turns of each phase of winding is remarkably increased, so that the phase inductance of the motor is greatly improved, and the reliability and fault-tolerant capability of the system are further enhanced. The device comprises a shell; a stator core is fixedly arranged on the inner wall of the shell in the axial direction. An AB-phase winding and a CD-phase winding are embedded into grooves formed in the stator core respectively. Bearing seats are arranged in the middles of the left end cover and the right end cover, bearings are fixedly mounted in the two bearing seats, inner rings of the bearings are connected with an output shaft in an interference fit manner, a rotor permanent magnet is fixedly mounted on the output shaft, and the rotor permanent magnet is embedded in the rotor iron core.

Embodiments of the present disclosure provide an inductor current peak clamping circuit for a DC-DC converter, which includes a clamping signal generating circuit, a clamping signal amplitude detecting circuit, a clamping trigger circuit, a clamping state control circuit and a clamping signal control circuit. The clamping signal generating circuit generates a clamping signal according to a feedback voltage and a first reference voltage. The clamping signal amplitude detecting circuit generates a detecting signal according to the clamping signal and a second reference voltage. The clamping trigger circuit generates a clamping trigger signal according to a first and a second indication signal and the detecting signal. The active level of the first indication signal indicates that the feedback voltage is greater than or equal to the first reference voltage. The active level of the second indication signal indicates that the main phase inductor current reaches a peak value. The clamping state control circuit generates a clamping state control signal according to the first indication signal, the detecting signal and the clamping trigger signal. The clamping signal control circuit clamps the clamping signal at a clamping reference voltage when the clamping state control signal is at an active level.

The invention relates to the technical field of fault diagnosis, and particularly discloses a rotor eccentricity fault detection method and system based on inductance symmetry analysis, and the method comprises the steps: obtaining motor winding structure parameters; mapping to obtain a three-phase inductance initial value under the star-shaped equivalent model; reconstructing the instantaneous equivalent inductance of the three-phase winding; constructing an inductance symmetry deviation factor based on the three-phase reconstruction inductance value; rotor eccentricity type recognition is executed based on the eccentricity judgment template; and outputting an eccentric identification result. In the prior art, winding structure differences are ignored, and eccentric characteristics are extracted directly based on current and voltage waveforms, and the technical problem that cross-model motors under different topological structures are difficult to use in a scene facing star-shaped, triangular or multi-layer lap winding structures is solved. According to the method, the inductance equivalent transformation model for different winding topologies is constructed, and the inductance symmetry deviation factor and the eccentric template matching identification mechanism are combined, so that the universality of eccentric fault detection is improved.

The invention relates to an eight-in-one coupling inductor and a converter, and the eight-in-one coupling inductor comprises two cover plate magnetic cores which are oppositely arranged, and nine cross beam magnetic cores which are located between the two cover plate magnetic cores and are arranged at equal intervals in the length direction of the cover plate magnetic cores. And the eight groups of windings are respectively wound on the two cover plate magnetic cores in a forward winding and reverse winding alternating manner to form a phase inductor, a phase inductor, a phase inductor, a phase inductor, a phase inductor, a phase inductor, a phase inductor and a phase inductor. According to the eight-in-one coupling inductor and the converter, the size of a cross beam magnetic core shared by inductors of different phases can be reduced, and the power density of a system is effectively improved; and magnetic fields with opposite directions are formed through currents of branch inductors in the same phase, so that external magnetic fluxes are mutually counteracted, the external magnetic fluxes of the magnetic core are reduced, and the EMI performance of a system is remarkably improved.

The application relates to a magnetic circuit structure adjustable reactor, and relates to the technical field of electromagnetic elements. In order to solve the problems of non-continuous smoothness of inductance adjustment and single load adaptation of traditional adjustable reactors, the application comprises a stator-mover assembly, the stator-mover assembly comprises a stator, a coil and a mover iron core, the coil is arranged in the tooth part of the stator; the mover iron core is coaxially arranged in the cavity of the stator, the number of teeth of the mover iron core is the same as that of the stator and the positions correspond to each other; a screw rod adjusting assembly is in transmission connection with the mover iron core, and the stator-mover assembly and the screw rod adjusting assembly are both located in a reactor shell. The axial coupling length of the stator and the mover can be adjusted through the screw rod adjusting assembly, the axial coupling area of the stator teeth and the mover teeth is changed, the output inductance value of the linear smoothness adjustable reactor is realized, and meanwhile, the wiring mode of the reactor coil can be changed, so that the three-phase inductance values output by the reactor are the same under the conditions of three-phase symmetrical load and three-phase asymmetrical load.