29 results about "Doubly salient" patented technology

The application discloses an efficiency optimization method of an electrically excited doubly salient wind power generator, and belongs to the technical field of motor control, and the technical scheme is as follows: step S1: a field-circuit combined simulation software Maxwell-Simplorer is used to establish a coupling model of a magnetic field and an electric field of an electrically excited doubly salient wind power generator system; step S2: loss distribution characteristics under different rotating speeds, load working conditions and conduction angles are obtained; step S3: a particle swarm optimization algorithm PSO is used to optimize a neural network BP, and loss data of the electrically excited doubly salient wind power generator system is trained; and step S4: the optimal conduction angle obtained in step S3 is applied to control of the electrically excited doubly salient wind power generator system. The application can obtain the optimal conduction angle in a wide rotating speed load range, realizes loss optimization of the motor, and improves the system efficiency.

This invention discloses a fault-tolerant control method for a modular bearingless electrically excited doubly salient pole motor under fault conditions, relating to the field of fault-tolerant control for bearingless electrically excited doubly salient pole motors. This scheme uses a three-phase full-bridge converter to control the switching transistors, enabling the three-phase full-bridge converter to operate alternately as a single-phase bridge inverter circuit under normal and fault conditions of the switching transistors, achieving fault tolerance of the switching transistors in the toroidal DC winding control circuit. Under the condition of open circuit and loss of excitation in the toroidal DC winding, fault-tolerant control of rotor levitation of the modular bearingless electrically excited doubly salient pole motor is achieved through the reuse of the armature winding. The method includes a three-phase full-bridge converter control strategy for fault-tolerant control of the modular bearingless electrically excited doubly salient pole motor and an armature winding reuse control strategy for fault-tolerant control of the modular bearingless electrically excited doubly salient pole motor. This further improves the fault tolerance capability of the modular bearingless electrically excited doubly salient pole motor.

The invention relates to the field of motors, and discloses a magnetic suspension doubly salient permanent magnet motor, which comprises a rotating assembly, and is characterized in that the rotating assembly comprises a rotor shaft and a stator part arranged at the outer side of the rotor shaft; the radial suspension assembly is arranged on the outer side of the rotor shaft; the axial suspension assembly is arranged on the outer side of the rotor shaft; the permanent magnet is located between the radial suspension assembly and the axial suspension assembly; the equipment combines the characteristics of a magnetic bearing and a doubly salient motor, due to the magnetic isolation effect of the permanent magnets, the armature magnetic field of the motor and the magnetic suspension bearing control magnetic field do not influence each other, independent control of torque and suspension force can be realized without adding a decoupling algorithm, the advantages of no mechanical wear, long service life and the like of the magnetic suspension bearing are exerted, and the magnetic suspension bearing is more stable in performance. And the purposes of low energy consumption and high efficiency of the doubly salient motor are achieved.

The invention discloses a four-quadrant operation method under excitation loss fault tolerance of an electro-magnetic doubly salient motor, and belongs to the field of motor control. According to the operation method, a quadrant operation interval is determined through logical judgment of output polarity and rotation speed polarity of a rotation speed ring regulator. The torque pulsation problem existing during torque output is considered, a two-period twelve-state control strategy adopted during positive torque output is designed, and a designed two-period six-state control strategy is adopted during negative torque output. And switching back and forth between the two designed control strategies through designed quadrant judgment to realize torque commutation output. According to the method, smooth switching of the electrically excited doubly salient motor in the four-quadrant state can be achieved, torque ripple suppression can be achieved in the stable state, and the two designed strategies and methods are simple and convenient and high in portability.

This invention discloses an improved integrated winding structure for a bearingless electrically excited doubly salient pole motor, relating to the field of bearingless motor technology. It integrates the levitation winding and excitation winding of a traditional bearingless electrically excited doubly salient pole motor into an integrated levitation winding. A control method is provided to enable the integrated winding configuration of the bearingless electrically excited doubly salient pole motor for power generation and stable levitation. This control method includes a displacement control module, a levitation current calculation module, and a levitation current control module. Stable rotor levitation can be achieved by controlling the levitation winding current. This scheme optimizes the winding arrangement and achieves mutual scheduling of power generation and levitation capabilities through equivalent control. Compared to traditional bearingless doubly salient pole motors, the integrated winding configuration bearingless electrically excited doubly salient pole motor designed in this invention improves the utilization rate of slot space, expands the working range of the bearingless doubly salient pole motor, and its overall operating state is more flexible.

This invention presents a method for improving the torque performance of an electrically excited doubly salient pole motor based on current-coordinated control. By analyzing the influence mechanism of excitation current and armature current on the magnetomotive force, the concept of equivalent current is proposed, and the excitation current and armature current are equivalently converted. Based on this, a current-torque model is established to derive the current distribution ratio that maximizes the output torque, optimizing the allocation of excitation current and armature current. Furthermore, this invention employs an asymmetric current control method, which effectively utilizes reluctance torque for compensation, further improving the average torque and significantly reducing torque ripple. This invention can calculate the optimal current distribution ratio in real time under low-speed and dynamic operating conditions, achieving dynamic adjustment of excitation current and armature current, and significantly improving the torque output capability of the electrically excited doubly salient pole motor. This invention is suitable for applications with stringent requirements for torque output performance, such as aircraft starting systems.

The application relates to the technical field of axial flux double-field motor, and particularly discloses a modular double-ladder topology axial flux double-field motor which adopts an axial structure of double rotors plus a single stator, forms symmetrical air gaps, and is provided with a first rotor, a second rotor, permanent magnets which are respectively composed of a plurality of modular stator cores and are combined in a circumferential direction, and stator permanent magnets and rotor permanent magnets which are designed to be rectangular plus ladder structures along the circumferential direction after being chamfered, are loaded in accommodating grooves one and accommodating grooves two respectively formed in the stator cores and the rotor cores, form a double-ladder alternating pole topology structure of alternating permanent magnets and ferromagnetic materials, effectively overcome the constraint relationship between the ferromagnetic teeth and the permanent magnets, can realize optimal magnetic flux modulation effect when torque is generated, improve the utilization rate of the permanent magnets, and can strengthen multiple working subharmonics while enhancing the fundamental wave, realize multi-harmonic co-excitation, and further improve the motor torque density.

The invention discloses a fault-tolerant control method for an open-winding doubly salient reluctance motor, mainly relates to the field of doubly salient reluctance motor control, and can realize fault-tolerant control when an inverter power switch tube has an open-circuit fault. The control system mainly comprises a doubly salient reluctance motor, a converter, a direct current power supply and a sensor. Wherein the converter topology adopts a double-inverter topology and is formed by two groups of three-phase inverters. In a vector control mode with direct-current bias, the current stresses of upper and lower bridge arms are different, open-circuit faults are easy to occur, the output efficiency is greatly reduced, and even electrodes are damaged. In order to deal with the situation, the fault-tolerant control method provided by the invention can switch the control mode of the motor on line when the open-circuit fault of the power switch tube occurs, so that the stable operation of the motor is kept. According to the invention, the operation stability of the doubly salient reluctance motor in occasions with high safety requirements, such as automobiles, is improved.

This invention discloses a method for open-circuit fault diagnosis and fault tolerance in a four-arm converter with an electrically excited doubly salient pole motor. The method includes: establishing three locations—the DC bus input buses of the first three arms, the upper arm bus of the fourth arm, and the lower arm bus—to install current sensors; dividing the electrical angle period into six operating intervals based on the motor inductance curve to obtain the relationship between the drive signal and the phase current; introducing the power transistor drive signal as a fault characteristic, and locating open-circuit faults in all arms of the power transistors by detecting the amplitude, polarity, and zero-crossing state of the three current sensors; after fault diagnosis, employing a commutation angle optimization strategy for faults in the first three arms, a lower arm constant-on strategy for upper arm faults in the fourth arm, and a fault-tolerant strategy based on excitation polarity reconstruction and potential coordination for lower arm faults. This method requires only three current sensors to achieve full-coverage fault diagnosis and fault-tolerant operation, reducing hardware costs and improving system reliability.

This invention discloses a method for diagnosing open-circuit faults in an electrically excited doubly salient pole motor inverter and its phase windings, relating to the field of motor fault diagnosis. The method includes: calculating the midpoint voltage of the phase bridge arm in the faulty sector to determine whether the fault is an open circuit in the upper transistor, lower transistor, or phase winding; based on different open-circuit fault types, turning on the upper power transistor, lower power transistor, or upper power transistor in the corresponding conducting state of the preceding and following sectors; calculating the midpoint voltage of the phase bridge arm in the faulty sector under different conducting states; combining the changes in the line excitation back EMF of the faulty sector; and determining whether the fault is an open-circuit fault type I or open-circuit fault type II in the upper / lower / combined transistor in the corresponding conducting state of the faulty sector, or an open circuit in the phase winding where the current in the faulty sector flows in the forward or reverse direction. This invention is based on the changing trend of the line excitation back EMF in different sectors, is unaffected by changes in inductance and speed, and achieves multiple fault location methods.

The invention relates to the field of motors, and discloses a doubly salient permanent magnet motor, which comprises a rotor part, and the rotor part comprises a rotating shaft, a rotor magnet yoke sleeving the axial surface of the rotating shaft, rotor salient poles uniformly arranged along the outer cylindrical surface in the axial direction of the rotor magnet yoke in a convex manner, and a plurality of rotating shaft salient poles uniformly arranged along the axial surface of the rotating shaft; the Hall sensor is integrated on the stator disc, and the rotating shaft salient poles and the rotating shaft are integrally designed, so that extra space occupation in the motor is ingeniously avoided, the space utilization efficiency of the motor is remarkably improved, and the motor is more compact in structure and more compact in structure. Mechanical loss caused by the fact that the rotor part of the Hall sensor is installed on the rotating shaft is effectively reduced, and the operation efficiency and reliability of the motor are improved. Besides, the position of the rotor can be accurately measured only through the Hall sensor on the disc, powerful support is provided for accurate control of the motor, and the performance of the motor is optimized.

According to the electric excitation doubly salient motor torque performance improving method based on current coordination control, the concept of equivalent current is provided by analyzing the influence mechanism of excitation current and armature current on magnetomotive force, and equivalent conversion is carried out on the excitation current and the armature current. On the basis, a current-torque model is established, so that the current distribution ratio enabling the output torque to be maximum is deduced, and distribution of exciting current and armature current is optimized. In addition, an asymmetric current control method is adopted, and the strategy effectively utilizes the reluctance torque for compensation, so that the average torque is further improved, and the torque pulsation is remarkably reduced. According to the method, the optimal current distribution ratio can be calculated in real time under the low-speed and dynamic working condition, dynamic adjustment of the exciting current and the armature current is achieved, and the torque output capacity of the electro-magnetic doubly salient motor is remarkably improved. The method is suitable for application occasions with strict requirements on torque output performance, such as an aviation starting system.

The invention discloses a six-phase doubly salient electro-magnetic wind generator open-circuit fault harmonic current suppression method, which belongs to the technical field of motor control, and comprises the following steps: firstly, based on full-order decoupling transformation fault-tolerant control, calculating a residual phase fault-tolerant current reference value under a single-phase open-circuit fault of a six-phase doubly salient electro-magnetic motor; secondly, performing positive and negative sequence separation on z1-z2 harmonic sub-plane current of the six-phase electro-magnetic doubly salient motor; then, designing a proportional double-resonance controller PDR; then, a positive and negative sequence rotation integrator is adopted to carry out discretization processing on a proportional double-resonance controller PDR; and finally, according to the z1-z2 harmonic sub-plane voltage signals uz1 and uz2 generated by the proportional double-resonance controller PDR and the alpha-beta plane voltage signals ualpha and ubeta, a converter power tube driving signal is generated. According to the invention, stable operation of the system can be maintained when the motor has a single-phase open-circuit fault, and harmonic current can be effectively suppressed.

The invention relates to the field of gravity energy storage, in particular to a doubly salient permanent magnet linear motor system for gravity energy storage and a motor control method. The stator module comprises a stator core, an armature winding and a permanent magnet; the mover module comprises a mover iron core and mover salient poles; the driving control module comprises an FOC controller, an SVPWM unit and a three-phase two-level inverter. Coordinate system current conversion is realized by the Clark conversion unit and the Park conversion unit; the double-closed-loop PI control unit generates a q-axis current reference value according to an actual speed and a given speed error; and an alpha-beta coordinate system voltage is generated through the inverse transformation unit and is input into the SVPWM unit. The energy conversion efficiency is improved structurally, friction and magnetic leakage loss are reduced, system stability is enhanced, rapid peak and frequency regulation, magnetic circuit optimization and end effect and energy loss reduction are realized through accurate control, accurate control of current and speed is realized in combination with a control circuit, the energy conversion efficiency and system stability are improved, and the energy conversion efficiency and the system stability are improved. The maintenance cost is reduced.

The invention discloses a rotor structure of a biphase magnetic material embedded motor, a preparation method and an assembly method, and belongs to the field of motor design. The rotor structure comprises a magnetic conductive block, a magnetic barrier structure and a sleeve structure, the magnetic conductive block is of a segmented structure; the sleeve structure is made of a biphase magnetic material, comprises an outer sheath arranged on the outer side of the rotor and an embedded support body embedded into a rotor pole center shaft, and is connected with the outer sheath; the sleeve structure is T-shaped under the single pole; the contact area of the sleeve structure and the magnetic barrier structure is set as a non-magnetic phase, and the rest area is set as a magnetic phase. The problem of mutual restriction of high strength and low flux leakage requirements in motor rotor design is solved, the peak rotating speed and torque output capability of the motor are improved, and the power density of the motor is improved.

The embodiment of the invention discloses a bearing-free doubly salient motor suspension force analysis and compensation control method for an eccentric working condition, relates to the field of motor control, and can improve system stability and suspension performance. The method comprises the steps of obtaining a motor suspension force analytical model considering rotor eccentricity based on motor inductance characteristics, constructing a double-loop suspension control system comprising the motor suspension force analytical model on the basis, and improving the stability and suspension performance of the system by adopting a feedforward control strategy. The problems of low suspension precision, poor anti-disturbance capability and the like caused by model idealization and compensation deficiency in a traditional method are solved, so that the stability and the suspension performance of a system are improved.

The embodiment of the application discloses an internal high-voltage direct-current power generation system and a parallel control method thereof, relates to the technical field of starting power generation, and can improve the utilization rate of the internal space of an engine and improve reliability. The application comprises a double-rotor electrically excited doubly salient motor installed in the internal space of the engine and an external parallel power supply system. A magnetic isolation material is installed in a stator core, the stator core and an outer rotor core constitute a starter generator installed on a high-pressure shaft of the engine, and the stator core and an inner rotor core constitute a generator installed on a low-pressure shaft of the engine. The starter generator and the generator are combined into a double-rotor electrically excited doubly salient motor, the power density and the utilization rate of the internal space of the engine are improved, parallel control is performed through the external parallel power supply system, the power generation operation of the system is more reliable, and the dynamic performance and the working efficiency of the engine are improved.

The application discloses a double-layer stator type radial magnetic bearing integrated in a doubly salient permanent magnet motor, and belongs to the technical field of power generation, power transformation or power distribution. The double-layer stator type radial magnetic bearing comprises a magnetic bearing stator-rotor, a control coil, a magnetic isolation ring and a magnetic conducting bridge. The magnetic bearing stator comprises upper-layer stator magnetic poles and lower-layer stator magnetic poles used for forming a direction control loop, and the two layers of magnetic bearing stator magnetic pole yoke parts are isolated by the magnetic isolation ring. A closed radial bias magnetic field main loop is formed by the permanent magnet extending out of the motor stator section, the circumferential magnetic conducting bridge, the double-layer stator magnetic poles, the radial working air gap and the magnetic bearing rotor, the bias loop and the control loop are decoupled, and the multipurpose reuse of the permanent magnet magnetic field of the doubly salient stator permanent magnet motor is realized. The motor yoke part space is fully utilized, the axial length of the magnetic suspension motor system is reduced, the dynamic performance of the motor rotor is improved, and the target of high compactness, high integration and component reuse of the "stator type permanent magnet motor + magnetic suspension bearing" is achieved.

The application discloses a flux superposition effect modulation method for specific harmonic current closed-loop control of an electrically excited doubly salient motor, and belongs to the field of motor drive control technology. In a multiplex excitation winding current source type electrically excited doubly salient motor drive control system, a specific order rotating coordinate system is set to extract harmonic current, a harmonic current closed-loop control loop is constructed, the flux superposition effect of the current source type inverter is modulated, specific order current harmonic current is generated, the inherent torque ripple of the electrically excited doubly salient motor under the sinusoidal wave driving mode is offset, and the output characteristics of the electrically excited doubly salient motor drive system are improved. The application can set the flux superposition time distribution of the current source type inverter in a closed loop, realize specific order current harmonic injection, eliminate the output torque ripple of the motor drive system, and avoid the influence caused by the flux superposition effect in the traditional current source type converter.

The application discloses a current sensor fault diagnosis method of a doubly salient motor under loss of excitation, and relates to the field of fault diagnosis in motor control. The method changes the placement position of the excitation current sensor so as to obtain more fault information; on the basis, the working principle of the doubly salient motor under loss of excitation is combined, and the current sensor measurement value at the rotor sector switching position is taken as a feature to realize fault positioning and fault type determination. Compared with the prior art, the method is the only method that can be applied to the field of motor loss of excitation, which helps to improve the reliability of the driving system under the motor loss of excitation.

The invention discloses an all-parameter hybrid measurement method for a sine-type electro-magnetic doubly salient motor, and relates to the field of sine-type electro-magnetic doubly salient motors, and the method comprises the steps: firstly, taking the temperature change factor into consideration in an offline state, and obtaining armature resistances at different temperatures in an offline manner; then, an excitation flux linkage is determined by off-line actual measurement of any phase of no-load back electromotive force peak value at a specific rotating speed; on the basis of armature resistance and excitation flux linkage obtained through off-line measurement, three enhanced extended state observers are constructed for a motor motion equation of the sine-type electro-magnetic doubly salient motor and motor voltage equations under two orthogonal axis coordinate systems according to an active-disturbance-rejection control theory; according to the method, the design is simple, the measurement precision is high, the robustness is high, and the defect that different methods are adopted to measure mechanical parameters and electrical parameters respectively is avoided.

This invention discloses a modular bearingless electrically excited doubly salient pole motor, relating to the field of bearingless electrically excited doubly salient pole motor technology, which can further improve the fault-tolerant performance of modular bearingless electrically excited doubly salient pole motors. The invention includes: the main body structure of the modular bearingless electrically excited doubly salient pole motor, and a ring DC winding control method for levitation control of the modular bearingless electrically excited doubly salient pole motor. This invention achieves structural optimization of traditional bearingless electrically excited doubly salient pole motors, reducing the inter-winding coupling of traditional bearingless electrically excited doubly salient pole motors. Simultaneously, the modular topology facilitates physical isolation of the motor windings as well as electrical, magnetic, and thermal isolation, resulting in high utilization of the remaining healthy windings in case of failure. This topology can be used for bearingless electrically excited doubly salient pole motors with other stator and rotor pole numbers.

The invention provides a fault-tolerant control method for an open-circuit fault of a six-phase doubly salient electro-magnetic wind driven generator, and belongs to the technical field of motor control. Comprising the following steps: S1, calculating a reference value of each phase current in a fault-tolerant state based on a principle that magnetomotive force is not changed after a fault and by taking the minimum copper loss as an optimization target; s2, decomposing the reference value of each phase of current in the fault-tolerant state into a harmonic sub-plane through a vector space decoupling method, and obtaining a corresponding harmonic current reference value; s3, designing a nonlinear disturbance observer, and obtaining a compensation current by observing a current error; and S4, superposing the compensation current and the fault-tolerant control current to jointly serve as a reference instruction of a current inner loop, and realizing final current tracking control. According to the control method, current fluctuation can be effectively reduced on the basis of ensuring that the magnetomotive force of the motor is unchanged, the system efficiency is improved, and stable operation of the motor is ensured.

The invention discloses an efficiency optimization method for an electro-magnetic doubly salient wind driven generator, which belongs to the technical field of motor control, and adopts the technical scheme that the method comprises the following steps of: S1, establishing a coupling model of a magnetic field and an electric field of an electro-magnetic doubly salient wind driven generator system by utilizing field-circuit joint simulation software Maxwell-Simplorer; s2, acquiring loss distribution characteristics under different rotating speeds, load working conditions and conduction angles; s3, optimizing the neural network BP by adopting a particle swarm optimization (PSO) algorithm, and training the loss data of the doubly salient electro-magnetic wind power generator system; and S4, applying the optimal conduction angle obtained in the step S3 to system control of the electro-magnetic doubly salient wind driven generator. The optimal conduction angle can be obtained within the wide rotating speed load range, motor loss optimization is achieved, and the system efficiency is improved.

The invention discloses a fault diagnosis method for a position sensor of a doubly salient generator based on line voltage, and belongs to the technical field of motor control and fault diagnosis. The method comprises the following steps: when a system runs according to set commutation logic, monitoring a reference line voltage value corresponding to a current conduction state in real time; when it is detected that the voltage value of the reference line reaches a preset voltage threshold value, it is judged that the fault sensor in the current conduction state breaks down; after a fault is diagnosed, a fault-tolerant control strategy is executed immediately, and the conduction state of the switching tube is forcibly switched to the next conduction state; according to the invention, fault discrimination is carried out by using the line voltage characteristics without being influenced by the rotation speed and load change of the doubly salient generator controllable rectification system, and the diagnosis is accurate and rapid. The system can be maintained to operate continuously and stably when one or more position sensors fail, and the reliability and the fault-tolerant capability of the system are remarkably improved.

The application discloses a two-step offline diagnosis strategy for high-resistance connection fault of open-winding electrically excited doubly salient motor, and belongs to the technical field of motor fault monitoring. In the first step, the rotor is positioned at a commutation point by injecting a predetermined positioning pulse; in the second step, based on the characteristics that the self-inductances of two phases at the commutation point are equal, current pulses are injected into the two-phase windings, and the detection and positioning of the high-resistance connection fault are realized according to the difference of response currents. The application fills the blank of the high-resistance connection fault diagnosis technology of the open-winding electrically excited doubly salient motor, is suitable for the initial debugging and regular maintenance of the motor, and can effectively improve the reliability of the motor driving system.

The embodiment of the application discloses a high-speed electrically excited doubly salient motor driving system based on a variable bus voltage converter, relates to the technical field of variable reluctance motor driving control, and can improve the torque performance of the electrically excited doubly salient motor. The application comprises a DC power supply, a variable bus voltage converter, a three-phase full-bridge inverter and an electrically excited doubly salient motor; the input positive end and the input negative end of the variable bus voltage converter are connected with the DC power supply; the output end of the variable bus voltage converter is connected with the input positive end and the input negative end of the three-phase full-bridge inverter; in the variable bus voltage converter, a diode is connected with the input positive end of the variable bus voltage converter, and a capacitor is installed at the output end of the variable bus voltage converter; the three-phase full-bridge inverter is connected with the electrically excited doubly salient motor.

The embodiment of the invention discloses an electro-magnetic doubly salient motor position self-sensing control system based on built-in coil detection, and relates to the technical field of electro-magnetic doubly salient motor position sensorless control. Based on the electromagnetic characteristics of the electro-magnetic doubly salient motor, the mutual inductance value between the two coils is obtained through a method of injecting pulse voltage into the built-in excitation coils and obtaining induction voltage through the detection coils, and the rotor position angle is obtained through table look-up. Under the condition that a position sensor in an existing technical scheme is omitted, position-sensorless control over the doubly salient electro-magnetic motor can be achieved, and therefore the axial size of the motor is reduced.

This invention provides a stator, an electrically excited doubly salient pole motor, and a motor control method, relating to the field of motor technology. It solves the problem of large span of the electric excitation winding in existing electrically excited doubly salient pole motors. The stator includes a stator core, an armature winding, and an excitation winding. The stator core has multiple stator salient poles arranged equidistantly along the circumference, with winding slots formed between adjacent stator salient poles. The armature winding is wound around all the stator salient poles of the stator core within the winding slots. A notch is provided in the yoke of the stator core, connecting the inner and outer sides of the stator core radially, thus breaking the stator core at the notch. The excitation winding is wound on the yoke of the stator core at a position between two adjacent stator salient poles. The excitation winding and the notch are located at opposite ends of the stator core radially. Compared with existing technologies, this invention can reduce the span of the electric excitation winding, lower costs, and improve motor efficiency.