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49results about How to "To achieve fault-tolerant operation" patented technology

Hybrid excitation E-shaped iron core axial magnetic field permanent magnet brushless motor

The invention discloses a hybrid excitation E-shaped iron core axial magnetic field permanent magnet brushless motor, which comprises two stators, permanent magnets (4), three-phase concentrated armature windings (6), single-phase concentrated excitation windings (7) and a rotor (2). A fan-shaped permanent magnet is arranged between every two E-shaped stator iron cores; the three-phase concentrated armature windings are wound on the teeth of the two stators; and the excitation windings are wound on the middle teeth of the E-shaped stator iron cores. By the excitation windings and the armature windings, the capability of adjusting and controlling an air gap magnetic field of the motor is improved; the speed adjustment range of the motor is effectively broadened; the motor is ensured to have higher torque output capability and higher power density; by two sets of excitation sources provided by the permanent magnets and the excitation windings, the operation reliability of a system is greatly improved, and the fault-tolerant operation of the motor is realized; by a simple rotor structure, the operation reliability and the dynamic performance of the motor are improved; and because the motor has a smaller axial size, the motor is very suitable for places requiring thin installation strictly, such as a hub driving motor for an electric vehicle and the like.
Owner:SOUTHEAST UNIV

Power converter for switch reluctance starter/generator

The invention discloses a power converter for a switch reluctance starter / generator, and belongs to the technical field of fault tolerant control of switch reluctance generators and design of power converters. The power converter adopts a power converter topology, and effectively combines a switching tube and a load switching tube of each bridge arm by adding six auxiliary switching tubes S1-S6 in the conventional asymmetrical semi-bridge power converter topology of the self-excitation mode so as to realize redundancy when any switching tube of each bridge arm fails; and the switching tube has high utilization rate and strong reliability. Aiming at different fault modes, the power converter can be applied to various different control strategies, realizes fault tolerant operation, greatly improves the generating property and reliability of a generating system, and is quite applicable to fault tolerant control for the switch reluctance starter / generator.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Multi-port power electronic converter for energy internet

The invention relates to a multi-port power electronic convert for energy internet, and belongs to the technical field of power electronic converters. According to the invention, the converter is composed of one static synchronous series compensator, one static synchronous compensator, one DC-DC converter and one three-phase DC-AC inverter. The static synchronous series compensator and the static synchronous compensator are both formed on the basis of a modular multi-level converter. The DC-DC converter is formed by a plurality of isolated DC-DC converters which are subject to input series and output series, and shares a high-voltage DC bus with the static synchronous series compensator and the static synchronous compensator. According to the invention, the converter integrates the functions of a unified power flow controller and the functions of a power electronic transformer, thus having complementary advantages of the unified power flow controller and the power electronic transformer and reducing cost; the converter is modularized, is easy to expand and set with a backup, and has important application potential in future energy internet.
Owner:TSINGHUA UNIV

Short-circuit fault-tolerant vector control method for embedded hybrid magnetic material fault-tolerant cylindrical linear motor

The invention discloses a short-circuit fault-tolerant vector control method for an embedded hybrid magnetic material fault-tolerant cylindrical linear motor. The short-circuit fault-tolerant vector control method comprises the following steps: building a five-phase embedded hybrid magnetic material fault-tolerant cylindrical linear motor model; compensating normal thrust missing caused by a short-circuit fault phase and suppressing a thrust ripple caused by phase short-circuit current with non-fault phase current of the motor; and obtaining expected phase voltage by adopting a series of coordinate conversion and voltage feed-forward compensation strategies, and achieving a fault-tolerant vector control after the phase short-circuit fault of the motor by a zero-sequence voltage harmonic injection-based CPWM modulation mode. According to the short-circuit fault-tolerant vector control method, the motor can suppress the thrust ripple of the motor under the condition of a phase short-circuit fault-tolerant operation; more importantly, the dynamic property, the steady-state performance and the properties in a normal state are consistent; the switching frequency of a voltage source inverter is constant; a CPU is low in overhead; and a natural coordinate system only needs to counterclockwise rotate a certain angle in any phase short-circuit fault, so that the motor fault-tolerant operation can be achieved.
Owner:JIANGSU UNIV

Embedded type mixing magnetic material fault-tolerant cylindrical linear motor

The invention discloses an embedded type mixing magnetic material fault-tolerant cylindrical linear motor which comprises primary bodies and secondary bodies. The length of each primary body is smaller than that of each secondary body. An air gap is reserved between each primary body and the corresponding secondary body. Each primary body comprises armature teeth, fault-tolerant teeth and a coil winding. The 2*m armature teeth and the 2*m fault-tolerant teeth are uniformly distributed on each primary body, wherein m is the phase number of the motor and is larger than or equal to three; the armature teeth and the fault-tolerant teeth are arranged at intervals in a staggered mode. Only one set of disc-shaped coil windings are placed into an armature tooth groove of each primary body. No windings are arranged on the fault-tolerant teeth. The secondary bodies of the motor are made of mixing magnetic materials, a part of ferrite is used for replacing a part of rare earth permanent magnets to form four different mixing magnetic material structures, on one hand, the quantity of the adopted rare earth permanent magnets is greatly reduced, and the cost of the motor is reduced; on the other hand, as the magnetic energy product of the permanent magnets is reduced, the eddy-current loss of the motor is reduced greatly, and efficiency of the motor is improved.
Owner:JIANGSU UNIV

Flight control system executor deadlock trouble real-time detection method

A real-time detection method for executor blocking fault in a flight control system pertains to flight control system field. The invented method uses a multi-model structure to build a set of observers UIOs each of which is based on a system model for describing a specific executor fault, UIOs are used for generating residual error signals depending on faults, UIO of a model matching with the system generates a residual error signal close to zero, and each UIO of a model mismatching with the system generates a big residual error signal driven by the mismatch signal. Aiming at unknown model parameter caused by that the executor blocking position can not be predicted, fault detection is implemented by using a model with a model of an uncertain parameter to online approach the executor blocking parameter by self-adaptation adjustment, to make the UIO model to match with the system status.
Owner:DALIAN MARITIME UNIVERSITY

Rotor-permanent-magnetic type doubly-salient motor

The invention discloses a rotor-permanent-magnetic type doubly-salient motor. The rotor-permanent-magnetic type doubly-salient motor comprises a stator iron core, armature coils, a rotor iron core and permanent magnets, wherein the stator iron core and the rotor iron core are of salient structures; the stator iron core is provided with stator teeth; each coil in the armature coils cross on one stator tooth; the rotor iron core comprises U-shaped magnetic-permeating units and a ring-shaped magnetic-permeating bridge; the U-shaped magnetic-permeating units are fixed on the magnetic-permeating bridge and are opposite to the stator teeth; the quantity of the permanent magnets is equal to that of the U-shaped magnetic-permeating units; and the permanent magnets are embedded between every two U-shaped magnetic-permeating units, are magnetized tangentially and are consistent in the magnetizing direction. The rotor-permanent-magnetic type doubly-salient motor disclosed by the invention has the advantages of doubly-salient armature permanent-magnetic chains and high-sine each-phase no-load inductive potential, and simultaneously has the advantages of higher space utilization rate and permanent-magnet utilization rate and high torque density and power density.
Owner:SOUTHEAST UNIV

Permanent magnet fault tolerant motor driving system

The invention discloses a permanent magnet fault tolerant motor driving system. The system includes a permanent magnet fault tolerant motor, two sets of three-phase full-bridge driving circuits, two bidirectional thyristors, six fuses, and a separate 270V DC power source; the permanent magnet fault-tolerant motor comprises one set of armature ABC windings and one set of XYZ windings which are independent of each other, are symmetrical with respect to each other and are wound in a manner that each slot is wound with one phase of coils in a three-phase single-layer centralized mode; each set ofthree-phase full-bridge driving circuit is composed of six power switching tubes; the two sets of three-phase full-bridge driving circuits respectively control the ABC windings and XYZ windings of the permanent magnet fault-tolerant motor; when the system fails, a corresponding bidirectional thyristor is turned on, so that a half-bridge power conversion circuit with a neutral point is formed, andtherefore, the control of the fault-tolerant operation of the system is realized. The permanent magnet fault tolerant motor driving system of the invention has the advantages of magnetic isolation, physical isolation, thermal isolation, small cogging torque ripple, suppression of short-circuit current, and high fault tolerance, and can realize fault-tolerant operation under a condition that different electrical faults occur alone or simultaneously.
Owner:NANJING UNIV OF SCI & TECH

Permanent magnet fault-tolerant motor driving system for electric vehicle and control method thereof

The invention discloses a permanent magnet fault-tolerant motor driving system for an electric vehicle and a control method of the permanent magnet fault-tolerant motor driving system. The system comprises a permanent magnet fault-tolerant motor, a power switch tube, a brake resistor, two bidirectional thyristors, an independent direct-current power supply and two electrolytic capacitors. The method comprises the following steps: acquiring the current of a motor winding and the position angle of a rotor, and solving the mechanical angular velocity of the rotor; sending the current to a fault diagnosis device for fault diagnosis, sending a diagnosed fault signal to a fault processor for processing the signal, and changing the state of a corresponding bidirectional thyristor into a closed state; respectively outputting a given torque through a PI regulator for a given rotor mechanical angular velocity and an actual rotor mechanical angular velocity, and directly sending the given torque,the position angle of the rotor and a fault result to a direct-current controller, processing to output a current set value of each phase, obtaining a driving signal of an inverter, and driving the motor to operate in a fault-tolerant mode. According to the invention, the system is high in reliability, strong in fault-tolerant capability and high in motor output performance. The system can realize the fault-tolerant operation of different electrical faults independently or simultaneously.
Owner:NANJING UNIV OF SCI & TECH

Fault-tolerant control method and system for back-to-back converter of wind power generation system

The invention discloses a fault-tolerant control method and a fault-tolerant control system for a back-to-back converter of a wind power generation system. The fault-tolerant control method comprisesthe steps of: determining a faulty bridge arm among six bridge arms of the back-to-back converter, reconstructing the rest five healthy bridge arms into a five-bridge-arm converter, connecting corresponding phases of the original faulty bridge arm to one healthy bridge arm by means of a bidirectional thyristor, and defining the healthy bridge arm as a common bridge arm; detecting a current of thecommon bridge arm so as to avoid overcurrent of the common bridge arm under fault-tolerant control, and adjusting a rotation speed of a generator if the current of the common bridge arm is greater than a current early-warning value, thereby controlling a phase difference between corresponding phases at the generator side and the grid side on the common bridge arm to be within 120-240 degrees, andrealizing normal operation of a wind power generation grid-connected system. The fault-tolerant control method can realize the uninterrupted fault-tolerant operation of the system under the fault of the converter, can keep the common bridge arm to be non-overcurrent, and has good robustness.
Owner:SOUTHEAST UNIV

Fault-tolerant modulation method of common-bus-structure and double-end-cascade type five-level inverter

InactiveCN104578867ATo achieve fault-tolerant operationThe maximum output voltage does not changeAc-dc conversionInductorVoltage vector
The invention relates to a fault-tolerant modulation method of a common-bus-structure and double-end-cascade type five-level inverter. The method is characterized in that motor inductor energy accumulation and inductor follow current features are utilized to allow part of spatial vectors to be reusable, the spatial vectors with the amplitude of Vdc / 2 are used to reconstruct the spatial vectors having the same amplitude of Vdc / 2, the reconstructed spatial vectors are used to synthesize reference voltage vectors, and common-mode voltage and zero-sequence voltage are eliminated while fault-tolerant operation of the double-end-cascade type inverter is achieved. The method has the advantages that fault-tolerant operation of a common-bus-structure and double-end-cascade type five-level inverter system when two inverters of the system fail can be achieved, and meanwhile, maximum output voltage keeps unchanged.
Owner:CHINA UNIV OF MINING & TECH

Fault-tolerant control method and system for open-circuit fault of T-type three-level inverter

The invention discloses an open-circuit fault diagnosis and fault-tolerant operation method and system for a T-type three-level inverter. The method comprises the following steps: controlling the T-type three-level inverter to operate by adopting a seven-section SVPWM modulation mode; sampling the inverter bridge arm output and direct current side midpoint voltage at the same time to obtain a low-frequency voltage signal, and performing coordinate transformation to obtain an equivalent output voltage vector track of the inverter; through calculating voltage vector tracks under different faultconditions and operation states, establishing a fault characteristic value truth table, and judging the current fault type of a system according to the characteristic value of the current system and the fault characteristic value truth table; finally switching a corresponding control scheme, and realizing fault-tolerant operation of the T-type three-level inverter by using a redundancy vector equivalent replacement method.
Owner:HUAQIAO UNIVERSITY

Driving method of single-winding stator permanent magnetic flux switching motor capable of reducing suspension current

The invention relates to a driving method of a single-winding stator permanent magnetic flux switching motor capable of reducing suspension current. Firstly, in order to reduce an instantaneous peak value of suspension current, a six-phase single-winding bearingless magnetic flux switching motor is proposed; then, based on the proposed motor, a rotor suspension driving method is proposed, and theaim is to reduce an amplitude value of suspension current of the existing driving system of the single-winding stator permanent magnetic flux switching motor. The driving method greatly reduces the amplitude value of suspension current, and promotes the load capacity of the motor driving and the reliable operation capacity of the driving system.
Owner:FUZHOU UNIV

Fault-tolerant control method for single-phase open-circuit fault of six-phase permanent-magnet synchronous linear motor

The invention discloses a fault-tolerant control method for a single-phase open-circuit fault of a six-phase permanent-magnet synchronous linear motor. The fault-tolerant control method comprises the following steps: when the single-phase open-circuit fault of the six-phase permanent-magnet synchronous linear motor occurs, selecting a fault nominal model support vector machine and a fault controller by a flux linkage observation switching module; taking a deviation between a set speed and a speed fed back by a speed detection module and a deviation between set stator flux linkage and stator flux linkage observed and fed back by the flux linkage observation switching module as input signals of a fault internal model controller; outputting set stator shaft current by the fault internal model controller; comparing the set stator shaft current with actual current of the motor, and performing calculation through a PI (Proportional-Integral) regulator; performing Park inverse transformation and Clark inverse transformation on an output quantity to generate a PWM (Pulse-Width Modulation) signal for controlling an inverter; generating current with a variable frequency and a variable amplitude, and inputting the current into a motor stator; and implementing fault-tolerant control on the motor. The fault-tolerant control method has the beneficial effects that the support vector machine acquires a normal-state nominal model and a fault-state nominal model of the motor respectively; and an internal model control method is adopted, so that high robustness is realized.
Owner:SUZHOU HUAYA TELECOMM EQUIP

Hybrid excitation E-shaped iron core axial magnetic field permanent magnet brushless motor

The hybrid excitation E-shaped iron core axial magnetic field permanent magnet brushless motor of the present invention includes two stators, permanent magnets (4), three-phase concentrated armature windings (6), single-phase concentrated excitation windings (7) and rotors (2 ). A fan-shaped permanent magnet is arranged between every two E-shaped stator cores, the three-phase concentrated armature coil is wound on the two stator teeth, and the excitation winding is wound on the middle tooth of the E-shaped stator core. The use of electric excitation windings and armature windings improves the adjustment and control capabilities of the air gap magnetic field of the motor, effectively broadens the speed regulation range of the motor, and ensures that the motor has a strong torque output capability and high power density; using permanent The two sets of excitation sources provided by the magnet and the electric excitation winding greatly improve the reliability of the system operation and realize the fault-tolerant operation of the motor; the simple rotor structure improves the reliability of the motor operation and the dynamic performance of the motor; the shaft of the motor Smaller in size, it is very suitable for applications that strictly require thin installation, such as wheel hub drive motors for electric vehicles.
Owner:SOUTHEAST UNIV

Sub-module recombination based fault tolerant MMC space vector modulation method

The invention discloses a sub-module recombination based fault tolerant MMC space vector modulation method. The method comprises the following steps that (1) two or more random sub-modules in each phase of an MMC are combined to form new three-phase control units, namely, sub-units; (2) during normal operation of the MMC, a space vector modulation strategy is used to control each sub-unit independently, sampling time of the different sub-units are staggered, and the sub-modules in the sub-units and switching signals among the units take turns to keep the capacitance and voltage of each sub-module in balance; and (3) when the MMC sub-module has an open-circuit fault, the MMC structure is recombined according to the fault condition, and a redundancy vector is used as a sub-unit to ensure fault tolerance operation of the MMC. Thus, fault tolerant operation of the MCC can be realized via the flexibility of recombination and spatial vector modulation without extra redundancy backup and peripheral circuits.
Owner:ZHEJIANG UNIV

Self-service terminal card-feeding fault tolering method and self-service terminal

A self-service terminal card-feeding fault tolering method and a self-service terminal relate to the technical field of self-service terminals. The method comprises the following steps: detecting whether the entrance sensor of the self-service terminal is faulty or not; when the entrance sensor is faulty, the entrance sensor of the self-service terminal is shielded and switched from a normal service mode to an entrance fault-tolerant service mode; prompt information used for prompting the users to insert a card and press the confirm key is displayed on a card inlet waiting interface of the entrance fault-tolerant service mode. When the user receives the confirmation instruction inputted according to the prompting information, the card feeding mechanism of the automatic terminal is triggered to perform the card feeding operation. Via the method, automatic terminal is enabled to perform the self service even when the entrance sensor malfunctions, and fault-tolerant operation of the self-service terminal reader is realized, which improves the quality of the self-service and improves user experience. Satisfaction of users with self-service terminal service can be improved.
Owner:SHENZHEN YIHUA COMP +2

Double-end cascaded five-level inverter fault tolerance modulation method for open winding motor

The invention relates to a double-end cascaded five-level inverter fault tolerance modulation method for open winding motor. The method includes that a reference voltage vector T is resolved into two equivalent vectors T1 and T2 which are independently generated by an inverter 1 and an inverter 2 respectively; when at most four switching devices of any upper bridge arm of one inverter and a corresponding lower bridge arm of the other inverter are in fault, five voltage vectors A, B, C, D, E, F and O in space vector diagrams of the inverter 1 and the inverter 2 are still in normal use, the reference voltage vector is synthesized by the vectors, and fault tolerance operation of a system under the condition that a maximum output voltage is lowered by a half and a maximum output current is kept unchanged. The double-end cascaded five-level inverter fault tolerance modulation method for the open winding motor has the advantages that 1, fault tolerance operation under the condition that at most four switching devices of any upper bridge arm of one inverter and the corresponding lower bridge arm of the other inverter are in fault can be realized; 2, complex switches are omitted.
Owner:CHINA UNIV OF MINING & TECH

Z-source two-stage matrix converter with fault-tolerant topology and its control method

The invention discloses a Z-source two-stage matrix converter with a fault-tolerant topological structure and a control method thereof, belonging to the technical field of matrix converter control. The two ends of the three-phase bridge arm of the rectification stage of the Z-source two-stage matrix converter are connected in parallel to replace the fourth bridge arm of the open bidirectional switch; for the open circuit failure of the bidirectional switch tube of the rectification stage, the space vector sector of the rectification stage is re-divided so that each The sector contains a unique non-zero vector to adjust the fault-tolerant control strategy of the rectifier stage. When the expected vector of the rectifier stage is located in the faulty sector, the duty cycle of the through vector of the faulty sector is adjusted to adjust the fault-tolerant control strategy of the inverter stage. Aiming at the open circuit failure of a certain bidirectional switching tube of the rectification stage, the invention utilizes the fourth bridge arm and the fault-tolerant control strategy to realize the fault-tolerant operation of the Z-source two-stage matrix converter, thereby improving the reliability and safety of the matrix converter.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

A short-circuit fault-tolerant vector control method for a fault-tolerant cylindrical linear motor with embedded hybrid magnetic materials

The invention discloses a short-circuit fault-tolerant vector control method of an embedded mixed magnetic material fault-tolerant cylindrical linear motor, which includes establishing a five-phase embedded mixed magnetic material fault-tolerant cylindrical linear motor model; using the non-faulty phase current of the motor to compensate the short-circuit fault phase It leads to the lack of normal thrust of this phase and suppresses the thrust fluctuation caused by the short-circuit current of this phase; the expected phase voltage is obtained by adopting a series of coordinate transformation and voltage feedforward compensation strategies, and the CPWM modulation method based on zero-sequence voltage harmonic injection is used to realize the motor Fault-tolerant vector control after phase short-circuit fault. The invention can not only suppress the thrust fluctuation of the motor under the condition of phase short-circuit fault-tolerant operation, but more importantly, its dynamic performance, steady-state performance and normal performance are consistent, the switching frequency of the voltage source inverter is constant, and the CPU The overhead is small; when any one-phase short-circuit fault occurs, the natural coordinate system only needs to rotate a certain angle counterclockwise to realize fault-tolerant operation of the motor.
Owner:JIANGSU UNIV

A new two-stage seven-phase permanent magnet fault-tolerant motor

The invention provides a novel two-section type seven-phase permanent magnet fault-tolerant motor and belongs to the technical field of permanent-magnet synchronous motors. The motor comprises a motor shell, two rotor assemblies, two stator assemblies, a rotary shaft, a bearing, a bush, an insulating sleeve, a magnet isolating board and an end cover. The two stator assemblies and the two rotor assemblies are coaxially installed on the same shell. The two stator assemblies are a three-phase winding and a four-phase winding respectively and connected with the rotary shaft through the rotor assemblies respectively, so that a three-phase permanent magnet fault-tolerant motor section and a four-phase permanent magnet fault-tolerant motor section are formed. The magnet isolating board is installed between the two motor sections. Phase windings of the stator assemblies are in a concentrated single-layer winding mode and are embedded separately through teeth. Power is supplied to each phase winding through an independent H-bridge driving mode. The novel two-section type seven-phase permanent magnet fault-tolerant motor is good in physical isolation capacity, magnetic field isolation capacity, thermal field isolation capacity and electric isolation capacity and can effectively restrain short circuit currents of the permanent magnet motor, greatly improve the reliability of the permanent magnet motor and satisfy the requirements for primary fault work, secondary fault work and third fault safety.
Owner:北京北航天宇长鹰无人机科技有限公司

Motor control method and device and electronic device

The embodiment of the invention provides a motor control method and device and an electronic device, and the method comprises the steps of calculating the d-axis counter electromotive force of a motor under the condition that the motor is in a steady-state operation state; according to the d-axis counter electromotive force, obtaining a compensation amount through a preset closed-loop adjusting circuit; and compensating a feedback angle of an encoder by using the compensation amount. According to the embodiment of the invention, the fault-tolerant operation of the motor can be realized under the condition that the encoder is not replaced, and the fault-tolerant rate of a system is improved.
Owner:HANGZHOU OPTIMAX TECH

Control method for improving fault-tolerant capability of power electronic transformer

The invention discloses a control method for improving the fault-tolerant capability of a power electronic transformer, and belongs to the technical field of power electronic transformer control. According to the technical scheme, the method comprises the steps of detecting and comparing output voltage of each CHB module, voltage of a secondary side of a DC-DC module transformer and DC bus voltagein real time, and if the former is greater than 1.2 times of a rated value and the absolute value of the latter is less than 0.8 times of the DC bus voltage, considering that an open-circuit fault occurs in a DC-DC preceding stage; meanwhile, judging whether the device has a short-circuit fault or not through the voltage in the front-stage series resistor of the device. When it is judged that theDC-DC module device has an open-circuit fault or a short-circuit fault, the fault-tolerant capability of the equipment for the open-circuit fault and the short-circuit fault of the DC-DC module device is improved by reasonably changing the active power instruction transmitted by the power electronic transformer and the operation state of each DC-DC module. The method is applied to reliable operation of the power electronic transformer, solves the fault tolerance problem, and has the effects of improving the fault tolerance capability and improving the equipment reliability.
Owner:QINGDAO TOPSCOMM COMM

Magnetic suspension two-degree-of-freedom radial bearing four-phase full-bridge topology circuit

The invention discloses a magnetic suspension two-degree-of-freedom radial bearing four-phase full-bridge topology circuit, and a switch open-circuit fault tolerance system and method of the magnetic suspension two-degree-of-freedom radial bearing four-phase full-bridge topology circuit. A four-phase full-bridge topology is adopted as a winding topology of a magnetic bearing controller, redundancy design is carried out on a switching device based on the characteristic that winding current in an active magnetic bearing flows in one direction, a normal mode and a fault-tolerant mode are achieved, when the switching device breaks down, a fault switching tube does not participate in current control, a magnetic suspension bearing system is stably controlled by using a redundant switch element, the system can be kept running without shutdown under a fault-tolerant working condition, a rotor is ensured not to fall off, and the fault-tolerant capability of the magnetic suspension bearing system is effectively improved.
Owner:HUAZHONG UNIV OF SCI & TECH +1

A fault-tolerant cylindrical linear motor with embedded hybrid magnetic material

The invention discloses an embedded type mixing magnetic material fault-tolerant cylindrical linear motor which comprises primary bodies and secondary bodies. The length of each primary body is smaller than that of each secondary body. An air gap is reserved between each primary body and the corresponding secondary body. Each primary body comprises armature teeth, fault-tolerant teeth and a coil winding. The 2*m armature teeth and the 2*m fault-tolerant teeth are uniformly distributed on each primary body, wherein m is the phase number of the motor and is larger than or equal to three; the armature teeth and the fault-tolerant teeth are arranged at intervals in a staggered mode. Only one set of disc-shaped coil windings are placed into an armature tooth groove of each primary body. No windings are arranged on the fault-tolerant teeth. The secondary bodies of the motor are made of mixing magnetic materials, a part of ferrite is used for replacing a part of rare earth permanent magnets to form four different mixing magnetic material structures, on one hand, the quantity of the adopted rare earth permanent magnets is greatly reduced, and the cost of the motor is reduced; on the other hand, as the magnetic energy product of the permanent magnets is reduced, the eddy-current loss of the motor is reduced greatly, and efficiency of the motor is improved.
Owner:JIANGSU UNIV

Fault-tolerant method for entering card in self-service terminal and self-service terminal

The invention relates to the technical field of self-service terminals, and in particular, to a card reader fault tolerance method utilized in a self-service terminal. The method comprises: detecting whether a fault occurs at a card reader sensor of a self-service terminal (S101); when a fault occurs at the card reader sensor, shutting down the card reader sensor of the self-service terminal, and switching from a normal service mode to a card reader fault tolerance service mode (S102); displaying, on a waiting-for-reading-a-card interface in the card reader fault tolerance service mode, indication information indicating to a user to insert a card and press a confirmation button (S103); and upon receiving a confirmation command input by the user according to the indication information, triggering a card transferring mechanism of the self-service terminal to draw in the card (S104). The method can enable a self-service terminal to perform a self-service process when a card reader sensor malfunctions, realizing fault tolerance of the card reader of the self-service terminal, increasing quality of a self-service process, enhancing user experience, and increasing satisfaction of a user with respect to the self-service process. Also disclosed is a self-service terminal.
Owner:SHENZHEN YIHUA COMP +2

NPC three-level virtual synchronous machine bridge arm fault tolerance model prediction control method

The invention provides an NPC three-level virtual synchronous machine bridge arm fault tolerance model prediction control method which is used for solving the technical problem that after an NPC type three-level VSG bridge arm breaks down, a control strategy fails. The method comprises the following steps: firstly, reconstructing an NPC three-level VSG structure into a VSG bridge arm fault-tolerant structure, and establishing a prediction current model under a fault condition and a voltage vector of the VSG bridge arm fault-tolerant structure; secondly, acquiring the direct current side capacitor voltage at the current moment by using a sensor, and predicting the direct current capacitor voltage difference of the model at the next moment according to the direct current side capacitor voltage at the current moment; and finally, constructing a cost function with a delay compensation function, and selecting a voltage vector corresponding to the minimum value of the cost function as an optimal voltage vector to act on the next moment, thereby realizing VSG bridge arm fault-tolerant operation. After a switch device breaks down, the NPC three-level VSG can continuously run in a fault-tolerant mode, the effectiveness of the method is verified, and the running reliability of the VSG is improved.
Owner:ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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