1423 results about "Permanent magnet motor" patented technology

The invention provides a permanent magnet motor and a scroll inverter compressor, and relates to the technical field of scroll compressor design and manufacturing, and the permanent magnet motor comprises a stator iron core and a rotor iron core; the stator core comprises stator teeth and a stator yoke which are uniformly distributed along the circumference, fluid through grooves are formed in the outer side of the stator yoke at the tops of the stator teeth, stator grooves are formed in two adjacent stator teeth and the stator yoke between the two stator teeth, and a plurality of strands of conductive circular enameled wires are embedded in each stator groove; the outer side of the rotor core is composed of linear segments and arcs, air grooves which are evenly distributed are formed in the rotor core, non-uniform magnetic isolation bridges are formed between the air grooves and the linear segments on the outer side of the rotor core, a certain distance is formed between every two adjacent air grooves, parallel magnetic conductive ribs are formed, and permanent magnets with the magnetic field directions changing alternately are embedded in the air grooves. A rivet hole, a lightening hole and a shaft hole are arranged close to the inner side of the rotor core. Therefore, the defined proportionality coefficient Ks is kept in a reasonable range, the power density of the motor can be increased, the cost is reduced, and the efficiency is improved.

The invention provides a rotor iron core, a permanent magnet motor and an inverter compressor, and relates to the technical field of motor and compressor design and manufacture, the rotor iron core comprises uniformly distributed permanent magnet grooves, a groove is arranged between two adjacent permanent magnet grooves, each groove extends inwards along the radial direction of the rotor iron core, parallel magnetic bridges are arranged between the grooves and the permanent magnet grooves, and the permanent magnet grooves are connected with the parallel magnetic bridges. A first magnetic barrier groove, a second magnetic barrier groove and a third magnetic barrier groove which are symmetrically distributed are formed in the two sides of the top of each permanent magnet groove respectively, a first arc and a second arc are arranged on the outer side of the rotor core above the magnetic barrier grooves, the second arc intersects with the side edge of the groove, and permanent magnets with alternating magnetism are embedded in the permanent magnet grooves. The radius Rr of the outer side of the rotor iron core, the distance ho from the middle point of the bottom of the permanent magnet groove to the center point of the rotor iron core and the thickness hm of the permanent magnet meet the condition that (Rr-ho) / hm is larger than 2 and smaller than or equal to 3.4. By reasonably arranging the position and the size of the magnetic barrier groove, magnetic circuit distribution can be changed, magnetic flux leakage can be reduced, the power density of the motor can be increased, and electromagnetic vibration noise of the motor and the compressor can be reduced.

The invention belongs to the technical field of permanent magnet synchronous generator demagnetization fault detection, and particularly discloses a permanent magnet motor fault early warning system based on big data, which comprises a high-frequency injection and grid-connected control module, a fault early warning module and a fault early warning module, actively injecting a high-frequency disturbance signal of which the frequency is higher than the fundamental frequency into a control loop of the permanent magnet synchronous generator; the multi-source synchronous acquisition module is used for synchronously acquiring multi-dimensional operation parameters of the permanent magnet synchronous generator and performing time domain alignment and frequency domain separation on the multi-dimensional operation parameters to obtain synchronous acquisition signals; the composite feature extraction module is used for extracting a multi-dimensional demagnetization criterion of the permanent magnet synchronous generator based on the synchronous acquisition signal; the self-adaptive threshold regression prediction module is used for performing fusion evaluation on the multi-dimensional demagnetization criteria by using the demagnetization health index model to generate a demagnetization judgment result of the demagnetization degree of the permanent magnet synchronous generator; the method has the advantages that the demagnetization recognition accuracy is improved, and early warning is achieved.

The invention discloses a fault detection method suitable for a permanent magnet motor sewage pump, and particularly relates to the technical field of motor equipment operation fault detection.The fault detection method comprises the following steps that stage division is conducted on the operation process of the permanent magnet motor sewage pump, and staged dynamic baselines corresponding to all operation stages are established; extracting transient abrupt change of the operating parameters under the dynamic baseline constraint and forming a transient abnormal event sequence; the method comprises the following steps: judging the damage degree grade of a transient abnormal event, continuously accumulating risk integrals, outputting early warning information when a risk reaches a trigger condition, and generating an operation disposal instruction; according to the invention, by constructing a staged dynamic baseline and extracting a transient abnormal event, accurate identification of abnormal behaviors in different operation stages is realized; and in combination with a continuous accumulation mechanism of the damage degree grade and the risk integral, when the risk reaches a triggering condition, an early warning is output, and an operation disposal instruction is generated, so that the accuracy, timeliness and operation safety of fault detection of the permanent magnet motor sewage pump are improved.

The invention discloses a flux linkage tracking full-speed-domain high-precision predictive current control method for a permanent magnet synchronous motor, and the method comprises the steps: sampling a phase current signal, a position signal and a speed signal of the permanent magnet synchronous motor, and obtaining a dq sampling current through coordinate transformation; calculating a predicted current according to the established tracking discrete model; the sinusoidal variation characteristic and the dynamic transient characteristic of the resistance voltage drop are accurately considered in the current prediction and reference voltage calculation stage, and the resistance voltage drop is accurately represented through accurate feed-forward compensation of predicted current and reference voltage; a driving signal of the inverter is obtained through coordinate transformation and space vector modulation, and full-speed-domain high-precision fast-response current prediction control over the permanent magnet motor is achieved. According to the method, the current flow steady state control error caused by the model error is reduced, the current control precision and the dynamic response performance of the permanent magnet synchronous motor in the full-speed domain are effectively improved, and a high-precision model basis is provided for high-precision position-free control and parameter online identification.

The invention relates to a high-power water-cooling permanent magnet synchronous motor for engineering machinery, in particular to a high-efficiency heat dissipation motor system adopting a double-heat-pipe coupling cooling structure, which is characterized in that array flat heat pipes and high-speed working condition self-backflow rotating heat pipes are respectively integrated in a stator and a rotor, so that stator-rotor double-channel, phase-change and rapid heat conduction is realized; and the thermal control capability and reliability of the motor are improved. According to the motor, a plurality of ultrathin flat heat pipes are symmetrically arranged on the outer circle of a stator and are in one-to-one correspondence with winding notches, so that a rapid and efficient stator heat conduction path is formed; and meanwhile, the hollow rotating shaft made of sintered copper powder is designed into a rotating heat pipe structure, so that the heat of the rotor can be quickly transferred to the water-cooling casing through a bearing area, and the efficient cooling of the rotor assembly is realized. The double-heat-pipe structure constructs a stator and rotor independent heat dissipation channel through a phase change heat transfer mechanism, motor size constraint is not changed, temperature rise of windings and permanent magnets is remarkably reduced, heat balance and system stability are improved, and the double-heat-pipe structure is particularly suitable for high-load working conditions such as engineering machinery.

The invention relates to the field of motor structure design and optimization, and discloses a cogging torque and torque ripple optimization method for a permanent magnet motor for a vehicle. The method comprises the steps that based on an electromagnetic scheme, a geometric boundary and a term dictionary, a parameterized geometric prototype containing four symmetric semi-arc auxiliary grooves is constructed, and a design variable set structure is generated; converting the structure into a target evaluation interface structure containing a target item and a constraint item; an improved adaptive particle swarm algorithm is combined with finite element rapid check and a new iteration function to carry out optimization solution, and an updated candidate group structure is generated; and finally, optimal parameters are screened through Pareto sorting and robustness recheck, and an engineering configuration structure is generated. According to the method, through systematic parameter modeling, an efficient collaborative optimization algorithm and simulation evaluation, the optimization efficiency and reliability are remarkably improved, the cogging torque and the torque ripple of the motor are effectively reduced, and meanwhile, the process feasibility and the performance robustness of a design scheme are ensured.

The invention discloses an electric vehicle permanent magnet motor control method and system based on temperature rise prediction, and belongs to the field of motor control. The method comprises the following steps: generating motor temperature rise sample data based on a meshless method; a chaotic mapping-dream optimization algorithm is adopted to optimize multivariate variational mode decomposition parameters, and high-precision temperature rise data are reconstructed; a GNN-BILSTM-Attention prediction model is constructed, and a space-time double Attention mechanism is fused to predict a future temperature rise; and establishing a temperature rise-electromagnetic parameter mapping model, designing a graded early warning control strategy, and forming a prediction-control closed loop. According to the invention, the speed and precision of temperature rise prediction are improved, prediction-control deep coupling is realized, and the operation reliability and control precision of the motor are significantly enhanced.

The invention discloses a high-robustness deadbeat predictive current control method which is suitable for current control of a dual three-phase permanent magnet motor driving system, and belongs to the technical field of permanent magnet motor control. The method mainly comprises the following steps: reconstructing a motor mathematical model by adopting a space vector decoupling matrix and Park transformation to obtain a motor voltage equation under a dqxy axis; designing a linear expansion state observer; a reference value of an output voltage vector is obtained in combination with deadbeat predictive current control; time delay in the digital control system is calculated, and angle delay is compensated; and designing a closed-loop Smith predictor for compensating a time delay link to complete high-robustness dead-beat predictive current control of the dual three-phase permanent magnet motor. The current loop design in the method does not depend on motor parameters, and the method has high parameter change robustness. By introducing the closed-loop Smith predictor, large delay of the system can be effectively compensated, and high-precision current tracking is realized under low switching frequency.

The invention relates to a direct-drive permanent magnet motor speed optimization control method based on multi-strategy self-evolution perception fusion and toughness control, and solves the problems of poor model adaptability, sensitive sensor fault, weak disturbance suppression and the like in the prior art. The adopted technical scheme is that the method comprises the following steps: establishing a self-evolution motor modeling system; on the basis of a motor modeling system, credibility evaluation is carried out on collected multi-source motor operation data, and a fusion state estimation result is generated in combination with a multi-scale residual weighting mechanism; constructing a cognitive main controller, and outputting a motor speed optimization control signal; and setting a light fault threshold value and a heavy fault threshold value, constructing a three-level toughness control mechanism, and performing graded response on faults to realize fault recovery. The method has the advantages that the motor speed control precision, the system stability and the self-adaptive capacity are remarkably improved.

The invention discloses a position-free sensing method for a joint module based on rotating speed estimation and virtual Z correction. The method comprises the following steps: firstly, acquiring three-phase current of a permanent magnet motor for a joint module, and acquiring d-axis estimated current of a current period based on a d-axis current model in combination with a state quantity of the permanent magnet motor in a previous control period; based on the d-axis estimated current, constructing a rotating speed estimator taking the d-axis estimated current error as a sliding mode surface to obtain the estimated rotating speed of the motor rotor; integrating the estimated rotating speed, and combining with the initial position of the rotor to obtain the estimated position of the motor rotor in the current period; at the same time, at the zero crossing point of the stator phase current, the estimation position is forcibly corrected to a predetermined electrical angle corresponding to the zero crossing point so as to eliminate the integral error. The invention aims to directly estimate the rotating speed without depending on any intermediate signal, and simulate the correction mechanism of a mechanical sensor to eliminate the estimation error, thereby realizing high-performance noise-free full-speed-domain position-free sensing control.

The invention discloses an axial segmentation dislocation type polygonal permanent magnet synchronous linear motor, belongs to the field of permanent magnet motors, and aims at solving the problems that an existing polygonal permanent magnet synchronous linear motor is large in end force and high in thrust fluctuation. The device comprises six primary modules which are arranged on the outer side in a polygonal layout; the secondary module is located in the center of the polygonal layout and is of a cuboid frame structure with two open ends, and the air gap distances between the secondary module and all the primary modules are equal; the six primary modules comprise two mother modules and four sub-modules, and the length, the pole number and the slot number of the mother modules are twice of those of the sub-modules; each side of the secondary module is provided with one mother module or two sub-modules, and the primary module structures of the two opposite sides are symmetrical; the two sub-modules located on the same side edge are axially arranged in a staggered mode with the central axis of the mother module as the reference, and winding reconstruction arrangement is carried out; the armature windings of each phase of any primary module are connected in series or in parallel to form a phase winding, and the same phase windings of the six primary modules are connected in series.

The invention discloses a motor, a compressor and refrigeration equipment, and relates to the technical field of permanent magnet motors, the motor comprises a stator iron core and a rotor iron core, rotor holes are formed in the inner circumference of the stator iron core, the number of stator grooves is Q, the width of each stator groove opening in the circumferential direction is W, and the minimum radius of each rotor hole is R; an inter-pole groove is concavely arranged between every two adjacent magnetic steel grooves and on the periphery of the rotor core, n harmonic grooves distributed at intervals are further concavely arranged on the periphery of the rotor core in sequence, central angles of the n harmonic grooves are A1, A2, and An in sequence on the circle center of the rotor core, a central angle of the inter-pole groove is As, and the number of poles of the motor is 2P, and the formula is satisfied. The technical scheme provided by the invention aims to suppress harmonic waves, reduce torque pulsation and further reduce the operation noise of the motor.

The invention provides a motor vibration noise control method and system based on modal resonance frequency prediction, and belongs to the field of motor control. The method comprises the following steps: acquiring each order of intrinsic mode frequency of the permanent magnet motor; a cost function parameter, a current constraint condition and a control target are set, and a model prediction control method is adopted to drive an inverter to operate, specifically, the current operation state quantity of the permanent magnet motor is collected; predicting a state response in a future finite time domain based on the operation state quantity; constructing a value function, and evaluating and optimizing a state change result; and selecting an optimal voltage vector, generating a pulse signal to drive an inverter to execute, obtaining a motor high-frequency electromagnetic force wave distribution condition, comparing the motor high-frequency electromagnetic force wave distribution condition with the intrinsic mode frequency of the permanent magnet motor, and optimizing an optimal voltage vector selection logic. The problems that harmonic waves are concentrated and resonance is easily caused by a fixed switching frequency modulation method in the prior art, and a passive suppression method is high in cost and poor in flexibility are solved.

The invention relates to the technical field of energy-saving permanent magnet motors, and discloses a permanent magnet rotor system capable of guaranteeing ultra-high-speed stability, which comprises a permanent magnet rotor and a controller, and is characterized in that the controller injects current synthesized by fundamental waves and specific space harmonics into a stator winding on the basis of not depending on rotor radial position feedback, so that the permanent magnet rotor is controlled to rotate; an electromagnetic potential well with radial self-recovery force is constructed in an air gap of the motor; moreover, the controller also monitors the change rate of an internal torque instruction, foreseeably and instantaneously reinforces the potential well to resist impact, and synchronously corrects the fundamental current to eliminate parasitic torque pulsation associated with reinforcement. And the rotor stability is converted from a dynamic adjustment problem depending on external high-speed closed-loop control to an intrinsic constraint problem of motor self-guarantee, so that the risk of failure caused by signal delay at an ultra-high speed in traditional reaction type control is reduced.

A rotor for a disc permanent magnet motor, includes: a first rotor core; a second rotor core; and a plurality of magnetic tiles. The first rotor core includes a first annular ring and a plurality of first magnetic blocks protruding at intervals from an outer side of the first annular ring in a circumferential direction, and a first groove is formed between every two adjacent first magnetic blocks. The second rotor core includes a second annular ring and a plurality of second magnetic blocks protruding at intervals from an outer side of the second annular ring in a circumferential direction, and a second groove is formed between every two adjacent second magnetic blocks. The first rotor core and the second rotor core are axially embedded with each other. The first magnetic blocks are embedded in the second grooves. The second magnetic blocks are embedded in the first grooves.

The invention relates to the technical field of electric variable and magnetic variable measurement, in particular to a permanent magnet motor rotor eccentricity fault diagnosis method, which comprises the following steps: step 1, composition and working principle of detection equipment, the equipment comprises a bracket, a coil group, a magnetic ring, current detection equipment and an indicator light, the coil group is formed by winding a high-magnetic-permeability magnetic material, and the magnetic ring is formed by winding a high-magnetic-permeability magnetic material; the magnetic ring is mounted on an output shaft of the motor; 2, an equipment installation step; according to the scheme, the detection device comprising the support, the coil assembly, the magnetic ring, the current detection device and the indicator lamp is constructed, and the current change of the coil assembly is monitored based on the electromagnetic induction principle, so that high-precision and real-time diagnosis of the eccentricity fault of the permanent magnet motor rotor is realized. The method can accurately judge whether the rotor is eccentric or not, the eccentric degree and the eccentric angle, can timely give out early warning according to the diagnosis result, provides a maintenance decision basis, effectively guarantees safe and stable operation of the motor, and improves the system reliability.

The invention discloses a current prediction control method and device for a permanent magnet motor, and the method achieves the real-time prediction of a voltage error caused by a dead zone and other non-ideal factors through the powerful nonlinear fitting capability of a feedforward neural network in combination with the learning of historical current time sequence characteristics. And the prediction error is further fed forward and compensated to a future current prediction model to improve the accuracy of current prediction, so that the cost function evaluation is more accurate, the optimal voltage vector is selected, and the steady-state current error and the low-speed torque ripple are effectively inhibited. In this way, precise control over the current of the motor is achieved, and the control precision and operation stability of the driving system are comprehensively improved.

The invention discloses a permanent magnet motor with a heat dissipation structure, and the motor comprises a rotating shaft, a rotor assembly disposed at the periphery of the rotating shaft, a stator assembly disposed at the periphery of the rotor assembly, a housing disposed at the periphery of the stator assembly, a transmission end cover disposed at one end of the housing, and a non-transmission end cover disposed at the other end of the housing. A non-transmission end fan is installed at the non-transmission end of the rotating shaft, a through hole is formed in the transmission end cover, the rotating shaft penetrates through the through hole and extends out of the transmission end cover, and a transmission end fan located in the through hole is installed at the transmission end of the rotating shaft. The permanent magnet motor with the heat dissipation structure has the advantages of being simple in structure, reliable in operation and capable of conducting heat dissipation on the two ends of the motor at the same time.

The embodiment of the invention provides a steering-by-wire system feedback control method, device and equipment, a medium and a vehicle, and relates to the technical field of vehicles. The method comprises the steps that in response to received vehicle state parameters, a target torque value output to a steering wheel and a detected actual torque value of the steering wheel are determined; based on the difference value between the actual torque value and the target torque value, deviation torque corresponding to the steering wheel is determined; based on the deviation torque, the actual torque value and the target torque value, a first torque value distributed to the magnetorheological damper and a second torque value distributed to the permanent magnet motor are determined; and on the basis of the first torque value and the second torque value, control signals are output to the magnetorheological damper and the permanent magnet motor correspondingly. According to the method, the problems that in the related technology, power consumption is high during feedback control of the steering-by-wire system, and the overheating risk is likely to exist are effectively solved.

The application relates to the technical field of permanent magnet motors, and discloses a heat dissipation type permanent magnet motor which comprises a machine body, a cooling cover for heat dissipation of the permanent magnet motor is fixedly connected to the outside of the machine body, and a purification shell for processing flowing air is fixedly connected to the outside of the cooling cover. The heat generated by the machine body during operation can be directly conducted and dissipated to air through the heat conduction strip. The memory metal strip senses the emergency overheating of the machine body during operation, so that the bending plate moves to trigger the contact to complete the temperature sensing of the machine body. The pulp plate runs to guide the external air into the cooling channel inside the heat conduction strip to perform air cooling heat dissipation, so that the permanent magnet motor adopts the combination mode of the heat dissipation fin and the emergency air cooling heat dissipation, the heat dissipation effect of the permanent magnet motor is improved, the filter plate filters and removes dust in the flowing air, the screw rod moves to make the nozzle move to perform high-pressure air blowing on the dust filtered and gathered in the filter plate, and the air dust filtered by the air cooling heat dissipation of the permanent magnet motor is automatically cleaned.

The invention discloses a discrete modeling and position-free control method for a low-carrier-ratio long-cable permanent magnet motor, and belongs to the field of motors. In order to solve the problem that the precision of a conventional mean voltage model is reduced due to the remarkable resistance characteristic of a low-carrier-ratio long-cable permanent magnet synchronous motor, a switching period is decomposed into a plurality of zero-order holding voltage excitation sections according to the discrete characteristic of the output pulse width modulation voltage of a converter; a motor accurate discrete model considering resistance characteristics is established by solving accurate current response of the permanent magnet motor segment by segment, a dead-beat current controller and a motor back electromotive force observer are further established based on the discrete model, and sensorless operation of the low-carrier-ratio long-cable permanent magnet synchronous motor system is realized. The discrete modeling precision of the low-carrier-ratio long-cable permanent magnet synchronous motor is improved, and the position-free control performance of the permanent magnet synchronous motor system under the working condition is improved.

The invention discloses a multi-signal fusion permanent magnet motor turn-to-turn short circuit fault diagnosis method, which is used for solving the technical problem that turn short is diagnosed only from motor current in the prior art, especially for early turn short diagnosis, the probability of missing report is high, and belongs to the technical field of motor turn-to-turn short circuit fault diagnosis. The three-phase current, the three-phase line voltage and the radial vibration acceleration signal of the bearing area of the bearing end cover of the motor are collected in real time in the operation process of the motor. The method specifically comprises the following steps of 1, current fault feature extraction; step 2, vibration fault feature extraction; s21, vibration spectrum fault feature extraction; s22, vibration envelope spectrum fault feature extraction; s23, calculating a vibration fault feature mark; step 3, turn short online feature mark calculation; 4, judging whether back electromotive force characteristic calculation is started or not; step 5, back electromotive force fault feature extraction; and step 6, final diagnosis of the short turn of the motor.

The invention relates to a starting and power generation integrated control method based on externally distributed bosses of a permanent magnet motor, and the method comprises the following steps: determining the initial position of a rotor of the permanent magnet motor relative to a stator through a pulse voltage injection method, and applying a drive signal to a stator coil, so that the motor reaches the rotating speed at which an ignition trigger can stably detect the signal; an ignition trigger is used for obtaining boss signals and conducting shaping processing, and the specific position of the rotor relative to the stator is determined; the stator coil is electrified by utilizing the relative position of the rotor and the stator, the motor is driven to rotate, and flux-weakening voltage regulation control is carried out; and when the power-assisted condition is met, a stator coil corresponding to the permanent magnet motor is electrified by utilizing the relative position of the rotor and the stator, so that switching control from power generation voltage regulation to power-assisted driving of the motor is realized, and power-assisted driving operation is executed. According to the control method, the boss on the rotor is used for starting and power generation voltage regulation control of the permanent magnet motor, and the method is simple and easy to implement.

The invention discloses a permanent magnet motor state monitoring control system based on petroleum drilling machine driving, and relates to the technical field of permanent magnet motor state monitoring. Comprising a data acquisition and construction module, a data preprocessing and feature extraction module, a dynamic monitoring and trend analysis module, a deep learning evaluation module and a fuzzy control and real-time compensation module, the collected real-time data are stored in a time sequence mode, a data set is established, and complete and accurate basic data are provided for subsequent analysis and model evaluation. Through real-time data acquisition, deep learning evaluation, fuzzy control optimization and error compensation, and adaptive regulation and control of dead zone time, the stability, reliability and energy efficiency of the petroleum drilling machine driving permanent magnet motor are improved, the short circuit risk, energy loss and harmonic damage are reduced, the system performance is optimized, and the operation efficiency is improved.

The invention relates to the technical field of ultra-high-speed motor design, fluid mechanical engineering and electromagnetic-structure coupling, in particular to an innovative structure-electromagnetic coupling design of a centrifugal hydrogen circulating pump driven by an ultra-high-speed permanent magnet motor. The integrated coupling rotor system is formed by rigidly connecting a permanent magnet motor rotor and a centrifugal impeller through conical surface interference and key groove positioning, a rotor iron core is formed by laminating 0.2 mm ultrathin silicon steel sheets (35W250), and impeller blade molded lines are optimized based on electromagnetic force harmonic characteristics (the number of blades is equal to the number of motor poles + / -1); the coupling matching degree is remarkably improved: through structure-electromagnetic parameter collaborative optimization, the comprehensive efficiency of the system reaches 85% or above, and is improved by 12%-15% compared with that of a separation design; an anti-resonance damping module is combined with a frequency avoidance design, and the vibration acceleration in an ultra-high-speed interval is smaller than or equal to 8 g and is reduced by 60% or above compared with a traditional design; the torque-load matching time is less than or equal to 0.3 s when the flow is suddenly changed, overcurrent impact or surge is avoided, and the dynamic requirement of a fuel cell system is met.

The invention discloses a deadbeat predictive current control method based on a composite disturbance observer, and belongs to the technical field of dual three-phase permanent magnet motor control. The dual three-phase permanent magnet motor is composed of two sets of stator three-phase windings, and the space phase shift angle is 30 degrees. The method comprises the following steps: establishing a discretized motor model containing total disturbance under a double-dq coordinate system; a composite disturbance observer is designed, and direct current disturbance and alternating current disturbance are synchronously estimated through a second-order disturbance expansion state observer embedded into a generalized integrator; and performing feed-forward compensation by using the disturbance estimation value, and calculating a voltage control quantity in combination with deadbeat prediction. By introducing the second-order disturbance expansion state observer and the generalized integrator, synchronous compensation of direct current disturbance and alternating current disturbance is realized, so that current harmonics are effectively reduced, and the current waveform quality is improved. Meanwhile, complete decoupling of the current control loop and the disturbance suppression loop is realized. In addition, the method still shows high robustness under the condition of motor parameter mismatch.

The invention discloses a non-electrolytic capacitor permanent magnet motor control method and system based on a non-linear observer, and the method comprises the steps: introducing a gradient search mechanism based on a stator voltage equation of a permanent magnet synchronous motor under a static coordinate system, and constructing a flux linkage observer equation; acquiring a voltage component and a current component of the permanent magnet synchronous motor in a static coordinate system, and observing the flux linkage observer equation to obtain a real component of a flux linkage amplitude error in a rotating coordinate system; and designing an exponential reaching law adaptive law, introducing an exponential reaching law to dynamically adjust the gradient search gain, and combining the real component of the flux linkage amplitude error under the rotating coordinate system as feedback to obtain the rotor position of the permanent magnet synchronous motor. The estimated flux linkage error value is used as the feedback quantity, and the real position of the rotor of the permanent magnet synchronous motor can be quickly and accurately tracked. The non-electrolytic capacitor permanent magnet motor control method and system based on the non-linear observer can be widely applied to the technical field of permanent magnet motor control.

The application discloses a permanent magnet motor, which comprises a stator and a rotor, the rotor is arranged at the inner circumferential side of the stator, the rotor comprises a rotor house and a plurality of magnetic pole modules, the plurality of magnetic pole modules are arranged at the outer circumferential side of the rotor house along the circumferential direction of the rotor house, and the gap between adjacent magnetic pole modules extends outwardly and obliquely from the outer wall of the rotor house in the direction away from the rotation direction of the rotor house. In the application, the air in the driving gap flows outward during the rotation of the permanent magnet motor, the air in the air gap between the driving stator and the rotor flows, the permanent magnet motor is cooled, the air flow resistance and the wind friction loss are reduced, the heat dissipation of the permanent magnet motor is enhanced, in addition, the resistance during the rotation of the rotor is reduced, the mechanical loss of the rotor is reduced, and the efficiency of the permanent magnet motor is improved.

The invention discloses a pumping unit disc type permanent magnet motor multi-objective parameter optimization method, which relates to the technical field of motor design and optimization, and comprises the following steps: pre-establishing a multi-physical field coupling simulation model, constructing a disc type permanent magnet motor electromagnetic and thermal performance simulation model based on Motor-CAD and Maxwell software, and completing no-load, load and thermal performance tests of the motor. According to the method, the multi-physical field coupling simulation model is established in advance, so that comprehensive coupling analysis of electromagnetic and thermal performance of the disc type permanent magnet motor is realized, and high-precision data support is provided for multi-objective optimization; key structure parameters such as air gap length, slot opening width and the like are scientifically selected as optimization objects, maximization of motor efficiency and minimization of cogging torque are taken as core targets, and meanwhile, constraint requirements of output torque, back electromotive force and structure size are strictly adherent to each other, so that the pain point that multiple performances are difficult to consider at the same time in traditional optimization is effectively solved.