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

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.

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.

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.

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.

The invention belongs to the technical field of motion control, and specifically relates to a fault-tolerant brushless DC motor drive control method, which uses a three-phase bridge drive circuit to build a fault-tolerant drive control system and then performs fault-tolerant control, including determining the switching tube and the motor to be turned on On the basis of the three-phase bridge drive circuit of the brushless DC motor, add a half bridge to lead out the star connection point of the three-phase brushless DC motor, and connect the lead wires with the added One half-bridge output terminal is connected to realize the fault-tolerant control of the brushless motor under the condition of small change compared with the original system. That is, by adding redundant configuration, when one phase of the motor fails or one phase of the drive fails, only the remaining two phases of the motor are used to achieve fault-tolerant operation under fault conditions.

The invention provides a two-stage matrix converter with fault-tolerant function and a fault-tolerant control method thereof. The present invention introduces a fault-tolerant circuit on the basis of the general two-stage matrix converter topology. The fault-tolerant circuit is a bridge arm composed of two bidirectional switch tubes drawn from the neutral point of the three-phase input AC power supply. The two ends are respectively connected with the positive and negative ends of the DC bus side of the rectification stage circuit. By separately controlling the two bidirectional switches in the fault-tolerant circuit, the present invention can enable the dual-stage matrix converter to provide the load with High-quality power for fault-tolerant operation.

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.

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.

The invention discloses a fault-tolerant control method and system for a back-to-back converter of a wind power generation system. The method reconstructs the remaining five healthy bridge arms after determining the faulty bridge arm among the six bridge arms of the back-to-back converter It is a five-leg converter, using bidirectional thyristors to connect the corresponding phases of the original faulty bridge arm to the healthy bridge arm, which is defined as the common bridge arm; in order to avoid the overcurrent of the common bridge arm under fault-tolerant control, the common bridge arm If the current of the common bridge arm is greater than the current warning value, adjust the generator speed to control the phase difference between the generator side and the grid side on the common bridge arm at 120 。 —240 。 In order to realize the normal operation of the wind power grid-connected system. The fault-tolerant control method involved in the invention can realize the uninterrupted fault-tolerant operation of the system under the fault of the converter, and at the same time can keep the common bridge arm from flowing, and has good robustness.