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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.