42 results about "Doubly salient" patented technology

The invention discloses an electro-magnetic doubly salient motor torque ripple suppression method based on harmonic double closed-loop control, and the method comprises the steps: constructing the harmonic double closed-loop control of a torque ripple outer ring and a current harmonic inner ring in an electro-magnetic doubly salient motor current source type drive system of a multiplexing excitation winding; a torque pulsation outer ring observes electromagnetic torque through a model reference adaptive method, pulsation components of the torque pulsation outer ring are extracted in combination with an adaptive notch filter, and a current harmonic inner ring given value is output through closed-loop regulation; the current harmonic inner ring extracts harmonic current by constructing a harmonic space decoupling transformation matrix and combining with a rotating coordinate system of corresponding subharmonics, current harmonics counteracting torque pulsation of the electro-magnetic doubly salient motor are generated through closed-loop adjustment, and the output characteristic of the motor is improved. According to the method provided by the invention, the torque ripple amplitude can be suppressed in a closed-loop manner, the given value of the harmonic current can be automatically adjusted, specific current harmonic injection is realized, the output torque ripple of the electro-magnetic doubly salient motor is eliminated, and the problems that a traditional harmonic injection method is not matched under different operation conditions of the motor and depends on motor parameters are solved.

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.

Supercapacitor direct-connected energy feedback control method based on the external characteristics of the motor, the steps include: 1) Analyze the structural parameters of the electro-excited doubly salient motor, establish a field-circuit coupling model and the peripheral drive circuit; 2) Divide the data segments, obtain the external characteristic data of the output voltage and current of the motor under different excitation currents, speeds and loads through multi-condition simulations, and preprocess the data; 3) Initialize the multi-layer perceptron model, take the motor speed, the target feedback current and the supercapacitor voltage as the model inputs, and take the reference value of the excitation current as the output. 4) Deploy the optimal model to the DSP embedded system to construct an energy feedback control system with supercapacitor direct connection based on the external characteristics of the electro-excited doubly salient motor. The control method proposed by the present invention has faster control speed and accuracy compared with the traditional PID controller, effectively improving the energy feedback efficiency.

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.

An embodiment of the present invention discloses a highly reliable modular hybrid excitation doubly salient motor for high-speed turbine power generation, which relates to the technical field of doubly salient motors. The motor stator core includes a first module stator core, a second module stator core, permanent magnets, and a magnetic isolation sleeve. The single-phase stator core is composed of two module stator cores, namely the first module stator core and the second module stator core. The three-phase module stator cores are fixed by being embedded in a magnetic isolation sleeve made of magnetic isolation material. An excitation coil and an armature coil are wound on the middle large tooth of the first module stator core, and only an armature coil is wound on the middle large tooth of the second module stator core, without an excitation coil. Both the motor stator core and the motor rotor core are of salient pole structures. The motor realizes the isolation of the magnetic flux paths between phases, ensuring that when a fault occurs in a certain phase winding, the influence of the faulty phase on other phases is relatively small.

The embodiment of the invention discloses a novel parallel hybrid excitation bearingless doubly salient motor, and relates to the technical field of bearingless motors. The side-by-side hybrid excitation bearingless doubly salient motor is composed of two parts of bearingless doubly salient motors which are coaxially arranged in parallel, one part is excited by a stator permanent magnet, the other part is excited by an excitation winding, and magnetic flux paths of the two parts are mutually independent and share one set of armature winding. Due to the fact that the two excitation modes of permanent magnet and electric excitation are adopted at the same time, the power density of the motor is remarkably improved, and the adjustment range needed by suspension current in the excitation current adjustment process is greatly reduced. In addition, when short circuit and other winding faults occur and field suppression is needed, the exciting current is reversed, the suspension force can still be stably generated by adjusting the two parts of current on the suspension winding, and the reliability of suspension operation of the system is improved.

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 present invention discloses a current source type driving and charging integrated system and control method for a double-salient-pole motor, comprising a battery, a bidirectional charging and discharging converter, a current source type converter, an electrically excited double-salient-pole motor, and a switching switch, wherein the two-section split excitation winding of the double-salient-pole motor is reused as the DC side energy storage inductor of the current source type converter. In the driving operation mode, the two sections of the excitation winding are connected in parallel in the same direction. By controlling the charge and discharge converter, a constant current can be provided to the DC side when the motor speed is low, and energy feedback can be achieved during the four-quadrant operation and braking of the motor. In the charging operation mode, the two sections of the excitation winding are connected in reverse series to achieve a demagnetization effect, thereby charging the battery while achieving zero torque output. The system is suitable for the driving and charging integrated system of electric vehicles, has the advantages of fewer switching devices and high reliability, saves space and cost, and reduces system losses.

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 high-temperature superconducting electro-magnetic doubly salient generator, and relates to the field of high-temperature superconducting motors. The stator core and the rotor core are both of a salient pole structure, and the stator teeth are of a parallel tooth structure, so that a larger stator slot space can be generated by the structure, and a superconducting magnet can be conveniently placed; only the armature coil is wound on the stator teeth, and the superconducting magnet is wound across the yoke part of the stator core. The outer edge of the stator yoke wound with the superconducting magnet is provided with a groove, and the superconducting magnet is fixed in the groove; the inner edge of a stator yoke in a large stator groove of the stator core is provided with a salient pole containing superconducting magnet with a proper size, so that magnetic field saturation in the stator yoke can be prevented. By winding the superconducting magnet on the stator yoke part, the influence of the magnetic field generated by the armature coil on the superconducting excitation coil is reduced, the risk of quench of the superconductor is reduced, and the leakage flux in the motor is a parallel magnetic field for the superconductor, so that the alternating current loss of the superconductor can be reduced, and the power density of the motor is further 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 present invention relates to the field of motor technology, and in particular to a four-phase dual-stator double-salient pole motor, comprising a coaxially arranged outer stator, a rotor and an inner stator, and is characterized in that the outer stator comprises an outer stator core yoke, outer stator core teeth and an armature winding, and outer stator tooth slots are provided between adjacent outer stator core teeth; the rotor comprises a plurality of rotor core blocks and a non-magnetic connection structure filled between the rotor core blocks; the inner stator comprises an annular inner stator core; an excitation winding is provided in the outer stator tooth slot of every four outer stator core teeth, or a permanent magnet is embedded in the inner stator core radially corresponding to the outer stator tooth slot; the permanent magnet and the excitation winding are both excitation devices, and the number of the excitation devices is N. pm =2k, the number of teeth of the outer stator core N s =8k, the number of rotor core blocks N r =6k or 10k, where k is a positive integer. This motor can effectively solve the low torque density problem existing in traditional structures and reduce the risk of thermal demagnetization of permanent magnets.

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 invention relates to the technical field of motor control, in particular to a doubly salient motor phase current reconstruction method based on phase winding winding, and the method comprises the steps: S1, removing three phase current sensors in a three-phase H-bridge converter, and respectively winding one current sensor on two different pairs of windings; s2, selecting a chopping strategy of the driving system; s3, the rotor position angle of the motor is obtained in real time, the sector where the rotor is located is judged according to the rotor position angle, the rotor position angle interval ranging from 0 degree to 120 degrees is the first sector, the rotor position angle interval ranging from 120 degrees to 240 degrees is the second sector, and the rotor position angle interval ranging from 240 degrees to 360 degrees is the third sector; and S4, in combination with the working principle of the open-winding doubly salient motor, phase current reconstruction is carried out through the relationship between the phase current in different current loops in different sectors and ics1 and ics2. Compared with an existing phase current reconstruction method, the method has the advantages that the number of the sensors is reduced from three to two, the topological structure of the power converter is not changed, and the influence of a chopping mode is avoided.

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.

This invention discloses a variable cross-section end-transposed winding for additive manufacturing and its optimization method, belonging to the field of motor winding design optimization. Based on a traditional flat wire winding with a uniform cross-section, a variable cross-section and end-transposed design were implemented, optimizing the conductor cross-sectional height and the spacing between conductors. Based on an analytical model of AC copper loss and considering the distribution of magnetic flux density within the slots, an optimization model for eddy current and DC losses of the winding was established, neglecting circulating current losses, thus obtaining the conductor cross-sectional height parameter. The two-layer transposed structure of the variable cross-section winding balances the potential difference in the branches, reducing circulating current losses. The conductor spacing was optimized, and finite element analysis and comparison were performed between the variable cross-section end-transposed winding and the uniform cross-section end-transposed winding. The variable cross-section transposed structure of this invention can effectively suppress high-frequency AC copper losses in electrically excited doubly salient pole motors operating under high-speed conditions, and has broad application prospects.

A three-phase, six-beat control method for an electrically excited doubly salient pole generator system includes: Based on a control strategy that switches on the upper-arm switch connected to the phase winding of the doubly salient pole generator during the rising phase inductance period, switches on the lower-arm switch connected to the winding during the falling phase inductance period, and disables the switch during the constant phase inductance period, the upper and lower switches are advanced by an angle α, and the upper switch is additionally advanced by an angle δ. The generator operates under rated conditions, and the output power of the generator is recorded for different combinations of advance angles α and δ. A radial basis function neural network is used to establish a model relating the advance angles α and δ to the output power of the doubly salient pole generator system. This model is used to determine the conduction angles α and δ corresponding to maximum power, and the conduction angles α and δ are used to control the doubly salient pole generator according to the operating conditions. This invention can improve the output voltage and power of the doubly salient pole generator system.

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.