101 results about "Reluctance torque" patented technology

The invention provides an asymmetric rotor structure for improving the torque density of a motor, a motor and a method, the rotor structure comprises an iron core, the iron core is provided with a shaft hole, a plurality of magnetic steel groups are distributed in the circumferential direction of the shaft hole of the iron core at equal intervals, and each magnetic steel group comprises a plurality of permanent magnet mounting groove structures, an air groove structure and a plurality of permanent magnet structures, each permanent magnet mounting groove structure is correspondingly provided with one permanent magnet structure; any number of permanent magnet mounting groove structures are configured to have a first arrangement direction on the iron core, and the air groove structures are configured to have a second arrangement direction on the iron core; wherein the first layout direction and the second layout direction are asymmetrically arranged in a space coordinate; a magnetic flux path is blocked, and magnetic flux leakage is reduced. The asymmetric design can optimize the magnetic field distribution of the permanent magnet, so that the phase difference between the reluctance torque component and the permanent magnet torque component is greatly reduced, and the effective torque superposition of the reluctance torque component and the permanent magnet torque component under wider working conditions is realized.

The present invention discloses an asymmetric rotor structure of a permanent magnet-assisted bearingless synchronous reluctance motor. Four groups of U-shaped magnetic barriers are evenly arranged along the circumferential direction inside the rotor. Each group of U-shaped magnetic barriers is divided into an outer layer, a middle layer, and an inner layer. The openings of the three layers of magnetic barriers face outward, and a permanent magnet is embedded in the center of the bottom wall of each layer of magnetic barriers. The outer and middle layers of magnetic barriers are symmetrical about the d-axis. One of the outer sections of the U-shaped side walls of the inner layer of magnetic barriers extends a small rectangular magnetic barrier parallel to the q-axis in the q-axis direction at the end facing the q-axis. A first small rectangular permanent magnet is fixedly embedded in the small rectangular magnetic barrier. A second small rectangular permanent magnet perpendicular to the first small rectangular permanent magnet is fixedly embedded in the outer section of the U-shaped side wall with the small rectangular magnetic barrier, forming a rotor topology in which both the magnetic barriers and the permanent magnets are asymmetric. The reluctance torque and the permanent magnet torque reach peak values ​​at similar or even the same current angles, thereby increasing the output torque synthesized by the reluctance torque and the permanent magnet torque.

The invention discloses a rotating speed loop control method for stable magnetic adjustment of a magnetic flux adjustable permanent magnet synchronous motor, belongs to the field of motor control, and aims to solve the problem that reluctance torque changes drastically during online magnetic adjustment of the magnetic flux adjustable permanent magnet synchronous motor. The method comprises the following steps of: 1, training a neural network model by taking an inductance parameter and a permanent magnet flux linkage which change along with a magnetization state and a direct-axis current as a data set; step 2, obtaining motor quadrature-direct axis current according to the collected stator current and rotor position information, and obtaining prediction values of motor inductance parameters and permanent magnet flux linkage through the trained model; 3, inputting the motor quadrature-direct axis current, the inductance parameter prediction value and the permanent magnet flux linkage prediction value into a torque-current gain adjuster to obtain a reluctance torque corresponding component prediction value and an adjusted torque-current gain; 4, obtaining a given value of quadrature-axis current, and further obtaining a driving signal of the inverter; and repeating the steps 2-4, and suppressing the torque rotating speed pulsation during the magnetic adjusting period.

The invention discloses an asymmetric permanent magnet auxiliary synchronous reluctance motor rotor structure for a new energy vehicle, and relates to the technical field of motor rotor structures, the asymmetric permanent magnet auxiliary synchronous reluctance motor rotor structure comprises an asymmetric rotor, the right side of the front part of the asymmetric rotor is connected with a first outer side air slot A, and the left side of the first outer side air slot A is provided with a second outer side air slot A; and the bottom side of the second outer side air slot A is connected with a second outer side air slot B. The rotor has the advantages that by constructing a phase coordination mechanism of an asymmetric magnetic circuit topology, optimization of current phase angle difference of permanent magnet torque and reluctance torque is realized, the comprehensive performance of the motor is further improved, the rotor adopts a composite configuration of a double-layer U-shaped magnetic barrier and a spoke type magnetic barrier, and the rotor is more compact in structure and more compact in structure. Differentiation configuration is carried out on permanent magnet space distribution based on the axis asymmetry principle, so that phase cooperation of the maximum value of the reluctance torque and the maximum value of the permanent magnet torque is achieved, and the dual optimization objectives of torque density improvement and pulsation suppression are achieved.

The invention provides a rotor structure with asymmetric magnetic poles, a permanent magnet motor and a manufacturing method, the rotor structure comprises an iron core, the iron core is provided with a shaft hole, a plurality of magnetic steel groups are arranged along the periphery of the shaft hole of the iron core at equal intervals, and each magnetic steel group comprises a plurality of permanent magnet mounting grooves and permanent magnets corresponding to the permanent magnet mounting grooves in number, a permanent magnet is arranged in each permanent magnet mounting groove; wherein the sizes of the plurality of permanent magnet mounting grooves are configured to be different, and the spatial position relationship among the plurality of permanent magnet mounting grooves is arranged to be an asymmetric structure. The sizes of the plurality of permanent magnet mounting grooves are configured to be different, so that the limitation of a traditional symmetrical structure is broken through. The asymmetric design can optimize the magnetic field distribution of the permanent magnet, so that the phase difference between the reluctance torque component and the permanent magnet torque component is greatly reduced, and the effective torque superposition of the reluctance torque component and the permanent magnet torque component under wider working conditions is realized.

The invention relates to the technical field of motor control, and discloses a motor optimization control method and system based on q-axis voltage control, and the method comprises the steps: carrying out the Clark-Park conversion and sliding mode observation of a three-phase current signal and a three-phase voltage signal, and obtaining a d-axis current signal, a q-axis current signal, a d-axis flux linkage component and a q-axis flux linkage component; performing recursive least square identification processing to obtain a real-time salient pole ratio value; reluctance torque angle arc tangent calculation and d-q axis coupling quantity product operation are carried out to obtain reluctance torque coupling disturbance quantity; according to the method, the limitation that in the prior art, work is only carried out near an MTPA curve is broken through, the adverse effect of d-q-axis cross coupling on q-axis voltage control precision is effectively eliminated, and the control precision of the q-axis voltage is improved. And the torque output capability and the dynamic response performance of the motor under various working conditions are improved.

The invention discloses a rotor and a synchronous reluctance motor with the same. In the invention, the rotor has an even number of magnetic barrier structures, each magnetic barrier structure comprises a plurality of arc-shaped magnetic barrier layers, the plurality of arc-shaped magnetic barrier layers of each magnetic barrier structure have the same symmetry axis, each arc-shaped magnetic barrier layer comprises five sections of magnetic barriers, two sections of outermost magnetic barriers are mutually symmetrical about the symmetry axis, and two sections of middle magnetic barriers are mutually symmetrical about the symmetry axis. A section of the innermost magnetic barrier is symmetrical about the symmetry axis, so that the reluctance torque of the motor can be fully utilized to improve the output performance of the motor by means of the design of the multiple layers of magnetic barriers with the same symmetry axis. In addition, the two outermost magnetic barriers are not filled with magnetic substances, so that the magnetic substances are far away from the stator winding to reduce the risk of demagnetization of the magnetic substances.

The invention discloses a TBM cutterhead main drive intelligent decision-making method and system, and belongs to the technical field of cutterhead drive control. Unified regulation and control and target torque distribution of a driving system are realized by constructing a master-slave type multi-driving-unit collaborative architecture; a fault is identified by monitoring a current signal, a voltage vector is reconstructed according to the fault type, and continuous and stable output under the fault is ensured; a disturbance observation method based on an integral sliding mode is provided, and control deviation caused by system disturbance and parameter changes is dynamically estimated and compensated; an MPTA control strategy of high-frequency virtual signal injection is designed, and utilization of reluctance torque and stable tracking of an MTPA working point are achieved; the torque output capacity of a fault unit and the torque margin of a healthy unit are comprehensively considered, a load distribution strategy is planned, and the overall loading capacity and the operation life of the driving system are improved.

The invention discloses a unit cascade type motor speed regulation control compensation method and system, relates to the technical field of motor control, and solves the problems that during motor operation, temperature rise, magnetic saturation or load sudden change can cause dynamic parameter change, parameters are not identified in real time, the reluctance torque compensation error is large, and the stability of the motor is poor. And the motor speed regulation control compensation accuracy is influenced. The reluctance torque is strongly correlated with the difference value of the Ld-Lq, and the difference value of the Ld-Lq is influenced by the motor design and the working condition. The RLS can accurately quantify the nonlinear part of the reluctance torque through online identification of the Ld-Lq difference value, and the limitation of a traditional table look-up method or offline calibration is avoided. Through cross coupling of a d-q axis current loop, the RLS can decouple mutual influence among parameters by identifying inductance parameters at the same time, and the bandwidth of the current loop is improved; meanwhile, the temperature rise of the motor can cause inductance drift, and the compensation amount is adjusted by continuously monitoring the inductance change, so that the torque attenuation caused by the temperature rise is avoided.

The utility model relates to the technical field of rotor punching sheets, in particular to a rotor punching sheet structure, which comprises a rotor punching sheet and a stator, the stator is arranged on the outer side of the rotor punching sheet, a plurality of groups of V-shaped magnetic steel grooves are arranged on the rotor punching sheet, four V-shaped magnetic steel groove positions are oppositely arranged on the edge of each V-shaped magnetic steel groove, outer diameter air magnetic isolation grooves are arranged at two ends of each V-shaped magnetic steel groove, and the outer diameter air magnetic isolation grooves are arranged in the outer diameter air magnetic isolation grooves. A plurality of V-shaped magnetic steel grooves are formed in the rotor punching sheet, magnetic steel bodies located at linear groove bodies are placed in the V-shaped magnetic steel grooves, an inner magnetic bridge is arranged between every two adjacent V-shaped magnetic steel grooves, a plurality of outer magnetic bridges located on the outer sides of the V-shaped magnetic steel grooves are arranged on the outer side of the rotor punching sheet, and de-weight holes and V-shaped magnetic steel grooves with large openings in pin hole punching sheets are formed in the rotor punching sheet in an annular array mode. The reluctance torque of the motor can be generated, and the output torque of the motor can be increased; the punching sheet body is provided with the air magnetic isolation grooves, the pole radian coefficient of the magnetic pole can be adjusted, and magnetic leakage of the magnetic steel can be reduced.

The application discloses a TBM cutter head main drive intelligent decision method and system, and belongs to the technical field of cutter head drive control. By constructing a master-slave type multi-drive unit collaborative architecture, unified regulation and control and target torque distribution of the drive system are realized; by monitoring current signals to identify faults, voltage vectors are reconstructed according to fault types, and continuous and stable output under faults is ensured; a disturbance observation method based on integral sliding mode is proposed, control deviation caused by system disturbance and parameter change is dynamically estimated and compensated; an MPTA control strategy of high-frequency virtual signal injection is designed, utilization of reluctance torque and stable tracking of the MTPA operating point are realized; the torque output capacity of the fault unit and the torque margin of the healthy unit are considered as a whole, a load distribution strategy is planned, and the overall load carrying capacity and operating life of the drive system are improved.

The present invention provides an embedded magnet type rotor that suppresses short circuits of magnetic flux in the rotor's magnetic poles, increases reluctance torque, and suppresses the effects of stress generated in the rotor core. [Solution] In an embedded magnet rotor having multiple magnetic poles formed in the circumferential direction of an iron core, each magnetic pole comprises a magnet arranged on the iron core in a V-shaped pattern with increasing spacing toward the outer circumference of the rotor, and a pair of flux barriers formed at the inner circumferential end of the magnet on the iron core. The flux barriers are formed to protrude further inward than the inner circumferential end of the magnet, and have portions that protrude toward the d-axis of the magnetic pole and portions that protrude toward the q-axis of the magnetic pole.

The invention discloses a driving / charging integrated system and a single-phase charging method based on an electro-magnetic doubly salient motor, which are characterized in that three change-over switches K1, K2 and K3 are added on the basis of the existing driving and charging integrated system topology, and integration of a single-phase charging function is realized on the basis of driving and three-phase charging. Two sections of split excitation windings which are reversely connected in series and a pre-stage circuit are multiplexed into a single-phase bridgeless PFC rectifier through a change-over switch, and an armature winding and an inverter bridge are multiplexed into three Buck circuits which are connected in parallel together, so that the charging voltage and current of a power battery are effectively controlled together, and excitation torque and reluctance torque which are generated by multiplexing the windings are eliminated at the same time.

A collaborative control method and system for a permanent magnet assisted synchronous reluctance motor is disclosed. In this method, the permanent magnet torque component and the reluctance torque component are calculated. Within a single preset control cycle, the current vector angle is adjusted to increase the permanent magnet torque component and decrease the reluctance torque component, forming a torque component unbalanced state. Under startup conditions, starting from the torque component unbalanced state, the current vector angle is gradually increased according to a preset step size to decrease the permanent magnet torque component and increase the reluctance torque component, and the total system loss is calculated. When it is determined that the total system loss reaches its minimum value within a preset time period, the current vector angle corresponding to the minimum total system loss is taken as the target current vector angle. Based on the target current vector angle, d-axis current commands and q-axis current commands are calculated and output to the current loop controller. This application aims to improve the torque response speed and energy utilization efficiency of a permanent magnet assisted synchronous reluctance motor in a water pump or fan under startup conditions.

The present application relates to the technical field of forklift motor, and particularly relates to a forklift motor energy-saving operation method and system based on reluctance torque vector optimization, which collects motor operation parameters through a sensor, fuses multi-source dynamic characteristics by using a parallel time sequence feature extraction network, extracts working condition characteristics in combination with bidirectional domain adaptive transfer learning, determines the number of key factors based on a dynamic working condition correlation matrix, generates a motor control characteristic vector through convex optimization and probability density estimation, generates a control scene in combination with a reluctance torque model and a phase current coupling relationship, calculates an energy efficiency index based on torque response and energy consumption distribution matching degree, and solves optimal control parameters by using a multi-objective optimization algorithm. The parameters are input into a grouping collaborative control unit, control groups are divided according to phase space distribution, optimal reluctance torque vectors are calculated by using an energy consumption dynamic prediction model through an intra-group competition and inter-group cooperation mechanism, and high-efficiency energy-saving operation under low-speed large-torque and frequent start-stop working conditions is realized.

The invention provides a rotor structure and a motor. The rotor structure comprises a rotor core (2) and permanent magnets (6), magnetic barrier layers (1) and magnetic steel grooves (5) are arranged on the rotor core (2), the multiple magnetic barrier layers (1) are arranged at intervals in the d-axis direction, each magnetic barrier layer (1) comprises an air groove (4) and a filling groove (7), each filling groove (7) comprises q-axis filling grooves (71) located on the two sides of the corresponding air groove (4), and the magnetic steel grooves (5) are located on the radial outer sides of the magnetic barrier layers (1) in the d-axis direction. The permanent magnets (6) are arranged in the magnetic steel grooves (5), under one pole, the radial center line of each permanent magnet (6) forms an offset angle delta relative to the d axis, and delta is larger than or equal to 2 degrees and smaller than or equal to 8 degrees. According to the rotor structure, the utilization rate of the permanent magnets can be improved, the electromagnetic torque and the reluctance torque are improved, and the output capacity of the motor is improved.

This invention provides a rotor, a motor, and a vehicle. The rotor includes: a rotor core; and multiple magnets, including a first magnet, a second magnet, and a third magnet. The rotor core includes: a core body with a magnet mounting portion. The magnet mounting portion includes: a first magnet slot group for mounting the first magnet, including a first magnet slot, the first magnet slot including a first sub-magnet slot, the included angle between the slot walls of two first sub-magnet slots near the axis being α1; a second magnet slot group for mounting the second magnet, including a second magnet slot, the second magnet slot including a second sub-magnet slot, the included angle between the slot walls of two second sub-magnet slots near the axis being α2; and a third magnet slot group for mounting the third magnet, including a third magnet slot, the included angle between the slot walls of two third magnet slots located on opposite sides of the axis being α3, where α3 > α1 > α2. This structure increases the reluctance torque ratio, reduces the amount of magnets used, and effectively increases the power density of the motor.

The embodiment of the invention provides a positive salient pole enhanced hybrid magnetic pole permanent magnet motor with a high reluctance torque utilization rate, and belongs to the field of motors. The positive salient pole enhanced hybrid magnetic pole permanent magnet motor with the high reluctance torque utilization rate comprises a stator structure and a hybrid magnetic pole rotor, the hybrid magnetic pole rotor comprises a magnetic flux adjusting rotor magnetic pole unit and an inductance adjusting rotor magnetic pole unit, and the magnetic flux adjusting rotor unit can change permanent magnet air gap magnetic flux. The inductance adjusting rotor magnetic pole unit can realize the adjustment of inductance parameters. Compared with a traditional magnetic leakage controllable motor, by arranging the magnetic flux adjusting and inductance adjusting independent rotor magnetic pole units, the utilization rate of the permanent magnets is improved, the salient pole characteristic of the motor is further improved, and the utilization rate of reluctance torque is improved; and through rotor magnetic pole offset, the output torque is increased and the torque pulsation is suppressed.

The application discloses a rotor structure of an asynchronous starting non-uniform magnetic barrier double-speed variable-pole permanent magnet motor and a reverse design method thereof, and first, air gap permeance design based on a magnetic resistance torque component and air gap flux density design based on a permanent magnet torque component are completed, and then, synthesis optimization design of non-uniform magnetic barriers and permanent magnets is completed based on the air gap permeance and the air gap flux density; based on the design method, the rotor structure is obtained as follows: the permanent magnets are built-in the rotor core, two adjacent permanent magnets are separated by a magnetic barrier, and the span of different magnetic barriers is set so that the magnetic barriers are asymmetrically distributed. Based on the modulation effect of the rotor structure on the air gap magnetic field, the pole pair number of working harmonics in the air gap magnetic field is selected by using the stator winding, and variable-pole variable-speed operation of the motor is realized; and the amount of the permanent magnets is low, and the material cost of the motor is greatly reduced.

At least two magnetic steel grooves are formed in the end face of the rotor punching sheet in the circumferential direction at intervals, a plurality of arc-shaped magnetic circuit guiding grooves are formed in the two ends of each magnetic steel groove respectively, the magnetic circuit guiding grooves are located in the inner sides of the magnetic steel grooves, the magnetic circuit guiding grooves are bent in the direction of the magnetic steel grooves, and the magnetic circuit guiding grooves are bent in the direction of the magnetic steel grooves. The plurality of magnetic circuit guiding grooves are arranged at intervals along the radial direction of the rotor punching sheet, and the widths of the cross sections of the plurality of magnetic circuit guiding grooves at one end of the magnetic steel groove are gradually reduced along the direction close to the center of the rotor punching sheet. Two ends of each magnetic steel groove are respectively provided with a plurality of arc-shaped magnetic circuit guide grooves, and the widths of the plurality of magnetic circuit guide grooves are gradually reduced along the direction of the center of the rotor punching sheet, so that magnetic lines can be guided from permanent magnet poles to silicon steel poles, the conduction path of the magnetic lines is prolonged, the magnetic resistance of the silicon steel poles is matched with that of the permanent magnet poles, and the salient pole ratio is increased; the reluctance torque is improved, and the torque reduction caused by the reduction of the use amount of the magnetic steel is made up.

The application discloses a unit cascade type motor speed regulation control compensation method and system, relates to the motor control technical field, and solves the technical problems that parameter dynamic changes caused by temperature rise, magnetic saturation or load mutation during motor operation, real-time parameter identification is not performed, magnetic resistance torque compensation error is relatively large, and motor speed regulation control compensation accuracy is influenced; the difference value of magnetic resistance torque and Ld-Lq is strongly related, and the difference value of Ld-Lq is jointly influenced by motor design and working conditions. RLS can accurately quantify the nonlinear part of magnetic resistance torque by online identification of the difference value of Ld-Lq, and avoids the limitations of traditional table lookup method or offline calibration. Cross coupling exists in the d-q axis current loop, RLS can decouple the mutual influence between parameters by simultaneously identifying inductance parameters, and the current loop bandwidth is improved; meanwhile, the inductance value drift caused by motor temperature rise is adjusted by continuously monitoring the inductance change, and torque attenuation caused by temperature rise is avoided.

The application discloses a built-in permanent magnet motor rotor structure, which comprises a rotating shaft and a plurality of rotor magnetic pole units, a permanent magnet slot is arranged in the rotor magnetic pole unit to separate the rotor magnetic pole unit into a plurality of layers of magnetic conductive cores, the plurality of outer magnetic bridges and inner magnetic bridges are connected into a whole, the inner magnetic bridge separates the permanent magnet slot into asymmetric left permanent magnet slots and right permanent magnet slots, rectangular block-shaped right permanent magnets and left permanent magnets are respectively arranged in the left permanent magnet slots and the right permanent magnet slots, the oblique included angle formed by the center line of the right permanent magnet of the same layer and the rotor D shaft is different from the left included angle, the inner and outer magnetic isolation bridges contain non-magnetic conductive magnetic isolation blocks, and magnetic lines of force cannot pass through the closed loop formed by the inner magnetic bridge and the outer magnetic bridge; the application solves the problems that the rotor magnetic bridge area magnetic leakage leads to low output torque, the magnetic bridge stress is too large to further improve the rotating speed, the permanent magnet torque and the magnetic resistance torque current angle are different by 45 DEG, the output comprehensive torque is low, and the motor power density is low.

The present invention discloses a rotor and a synchronous reluctance motor comprising the rotor. In the present invention, the rotor has an even number of flux barrier structures, each flux barrier structure comprising multiple arc-shaped flux barrier layers, the multiple arc-shaped flux barrier layers of each flux barrier structure having the same axis of symmetry, and each arc-shaped flux barrier layer comprising five flux barriers, wherein two outermost flux barriers are symmetric to each other with respect to the axis of symmetry, two middle flux barriers are symmetric to each other with respect to the axis of symmetry, and an innermost flux barrier is itself symmetric with respect to the axis of symmetry. Thus, the multi-layer flux barrier design with the same axis of symmetry can help to fully utilize the reluctance torque of the electric motor, so as to improve the output performance thereof. In addition, the two outermost flux barriers are not filled with a magnetic substance, so that the magnetic substance is remote from the stator windings to reduce the risk of the magnetic substance being demagnetized.

The invention discloses a quantitative characterization method for a magnetic axis offset effect of a magnetic axis offset type permanent magnet synchronous motor. The quantitative characterization method comprises the following steps: judging a magnetic axis offset type of the magnetic axis offset type permanent magnet synchronous motor; calculating a permanent magnet axis deviation angle and a permanent magnet torque based on the permanent magnet axis deviation according to a dq axis permanent magnet flux linkage obtained under the reference dq coordinate system; calculating a motor inductance matrix expression when the reference coordinate system rotates and deviates from the initial position by a set angle based on reluctance magnetic axis deviation; when the reference dq coordinate system is aligned with the reluctance magnetic axis, the mutual inductance of the dq axis is 0, the deviation angle of the reluctance magnetic axis is obtained through calculation, and the reluctance torque is obtained through calculation; and comprehensively considering the offset effect of the permanent magnet magnetic axis and the reluctance magnetic axis, and calculating to obtain the torque characteristic offset condition of the motor. Based on the influence of the magnetic axis offset effect on the permanent magnet flux linkage and inductance parameter characteristics of the motor, the magnetic axis offset effect is comprehensively revealed, and a theoretical basis is provided for establishing a mathematical model of the magnetic axis offset type permanent magnet synchronous motor and comprehensively revealing a torque lifting mechanism.

The invention provides an axial motor rotor structure, and aims to solve the problems of poor magnetism gathering effect and low magnetic steel utilization rate of an axial motor structure in the prior art. The rotor structure mainly comprises a supporting plate, a plurality of magnetic steel arranged in the circumferential direction and a rotor iron core. The magnetic steel and the rotor iron core are alternately and adjacently arranged to form a closed-loop structure and are fixed to the supporting plate. And the built magnetic flux path adopts a tangential magnetizing mode, so that the magnetic flux of the two adjacent magnetic steels can flow through the rotor core and then converge into an air gap to form a magnetism gathering effect. Through tangential magnetizing and unique magnetic circuit design, the air gap magnetic flux density and the motor salient pole rate are remarkably improved, the magnetic resistance torque is increased, meanwhile, the end magnetic leakage and the rotor loss are effectively reduced, and meanwhile the permanent magnet motor has the advantages of being high in power density, large in torque density, high in efficiency and low in material cost.

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 invention discloses a cooperative control method and system for a permanent magnet auxiliary synchronous reluctance motor, and the method comprises the steps: calculating a permanent magnet torque component and a reluctance torque component; a current vector angle is adjusted in a single preset control period, so that a permanent magnet torque component is increased and a reluctance torque component is reduced, and a torque component unbalanced state is formed; gradually increasing a current vector angle according to a preset step length from a torque component unbalanced state under a starting working condition to reduce a permanent magnet torque component and increase a reluctance torque component, and calculating the total loss of the system; when it is determined that the total loss of the system is the minimum value in the preset time period, taking the corresponding current vector angle when the total loss of the system is the minimum value as a target current vector angle; and calculating a d-axis current instruction and a q-axis current instruction based on the target current vector angle, and outputting the d-axis current instruction and the q-axis current instruction to a current loop controller. The method is used for improving the torque response speed and the energy utilization efficiency of the permanent magnet auxiliary synchronous reluctance motor under the starting working condition of a water pump or a fan.

This invention discloses an asymmetric hybrid surface-embedded-salient pole permanent magnet motor, belonging to the field of permanent magnet motor technology. It includes an outer stator core with an air gap in the middle and an inner hybrid surface-embedded-salient pole permanent magnet rotor. Three-phase armature windings are mounted on the stator core, and a shaft is surrounded by the rotor and located on the motor's central axis. The rotor includes rotor salient pole teeth, a rotor yoke, an inner air slot, permanent magnets, and an outer slot. The permanent magnets are placed in the outer slot, offset at an angle relative to the central axis of the outer slot. This invention combines the advantages of surface-embedded permanent magnet motors (simple structure, high permanent magnet utilization, high power density) and salient pole motors (high reluctance torque). By utilizing the asymmetric distribution of the permanent magnets, the peak values ​​of the permanent magnet torque and reluctance torque components can reach their maximum values ​​at similar current angles, improving torque component utilization and thus increasing torque density.

The invention discloses a rare-earth-free permanent magnet wind driven generator rotor and a generator with the same. The rare-earth-free permanent magnet wind driven generator rotor comprises a rotor iron core and a plurality of magnetic barrier assemblies embedded in the circumferential direction of the rotor iron core. The magnetic barrier assembly comprises a plurality of magnetic barrier units which are distributed at intervals in the radial direction of the rotor core, each magnetic barrier unit comprises two permanent magnet cavities which are symmetrically arranged about the radial center line of the rotor core, and the two permanent magnet cavities incline outwards in the direction away from the radial center line of the rotor core; and a rare-earth-free permanent magnet is arranged in each permanent magnet cavity. According to the invention, the inclined permanent magnet cavity enables the direct-axis magnetic circuit to form high magnetic resistance and the quadrature-axis magnetic circuit to form low magnetic resistance, and the salient pole rate and the reluctance torque ratio can be improved by cooperating with the radially spaced magnetic barrier units; meanwhile, the rotor yoke part with slightly low magnetic conductivity is adopted, so that a magnetic field can be prevented from leaking towards the rotating shaft, the magnetic field is forced to be transmitted towards an outer air gap direction, and magnetic leakage of the yoke part is reduced.

The present application discloses the rotor structure and application of an asynchronous start permanent magnet synchronous motor. The conductive bars are distributed unevenly and asymmetrically as a whole. The conductive bars and permanent magnets together form a multi-layer rotor structure with a magnetic flux barrier function. The conductive bars are tilted in the direction of the motor's main magnetic flux, which significantly increases the d-axis magnetic resistance, reduces the d-axis magnetizing inductance, increases the motor's salient pole ratio, increases the magnetic resistance torque, increases the acceleration torque during the pull-in synchronization process, and strengthens the pull-in synchronization capability. When the number of conductive bars is the same as in the related art, the conductive bar cross-sectional area in the back-electromotive force direction is larger, the overall conductive bar resistance is reduced, the slip rate near the critical synchronous speed is reduced, and the pull-in synchronization capability is improved. In addition, the conductive bars in the direction of the motor's main magnetic flux have a certain spatial tilt angle, which causes significant changes in the d- and q-axis currents, reduces the d-axis inductance, increases the d-axis current, and reduces the q-axis current, resulting in a smaller composite current, a larger internal power factor angle, and a smaller power factor angle, thereby improving both the power factor and efficiency.