78results about How to "Reduce torque ripple" patented technology

The invention discloses a permanent magnet synchronous motor non-inductive active-disturbance-rejection control method, which comprises the following steps: establishing a pulsating high-frequency voltage injection model of a permanent magnet synchronous motor, and injecting a high-frequency pulsating voltage signal into a direct axis of an estimated dq axis of the permanent magnet synchronous motor; a high-frequency response current equation under the dq shaft system is obtained and estimated; obtaining a simplified high-frequency response current equation according to the high-frequency response current equation and the high-frequency voltage signal, and obtaining an expression of a q-axis high-frequency response signal # imgabs0 #; based on an expression of a q-axis high-frequency response signal # imgabs1 #, a q-axis high-frequency current response estimation value containing a position estimation error is detected, useful information f (delta theta) is obtained after preset signal processing, and the useful information f (delta theta) serves as input of a PI controller so as to obtain an estimation value of the rotating speed. Compared with the traditional method, the control strategy and the signal processing method adopted by the invention are simpler and more efficient, the control performance and the stability of the system are improved, the complexity of system implementation is reduced, and engineering application and actual deployment are facilitated.

The invention relates to a model prediction fault-tolerant control method and system for a dual three-phase permanent magnet synchronous motor, and the method comprises the steps: estimating the lumped disturbance in the operation process of the motor in real time based on an extended state observer, and carrying out the feed-forward compensation of the reference voltage of the motor according to the lumped disturbance information; and based on the compensated voltage reference value, constructing a dynamic voltage vector set and correcting an initial voltage vector set, searching an optimal voltage vector in the dynamic voltage vector set, and driving the motor through three-phase decoupling space vector pulse width modulation. According to the field loss fault-tolerant control strategy designed by the invention, phase current harmonics caused by local field loss faults of the dual three-phase permanent magnet synchronous motor can be effectively suppressed, and the steady-state precision and the dynamic response capability of the system under the local field loss faults are enhanced.

The embodiment of the application provides a control method and device of a rod wire loop device and a storage medium, the control method comprises the following steps: determining a loop starting time of the loop device according to a rolling piece running speed of a target rolling piece and a downstream rack biting time; determining a real-time loop height value according to the loop starting time, a loop starting initial height, a steady-state target loop height and a ramp rising time, and controlling the loop device to start the loop according to the real-time loop height value; acquiring a real loop height value of the loop device, and correcting an upstream rack running speed according to the real loop height value and the real-time loop height value; and when a tail of the rolling piece leaves the upstream rack, the loop device is controlled to fall back according to a tail loop closing target height. The method realizes adaptive control of the rod wire loop.

The invention discloses an axial flux permanent magnet synchronous reluctance motor rotor based on modular harmonic counteracting, the rotor is designed in a three-in-one mode of structure modularization, magnetic barrier gradient and phase computable dislocation, a rotor assembly is formed by splicing N fan-shaped rotor modules along the circumference, and the adjacent modules are provided with optimal dislocation angles calculated according to the harmonic counteracting principle. The sum of target harmonic magnetic field vectors generated by each module is zero; a U-shaped magnetic barrier array of which geometric parameters are monotonically changed in a gradient manner is arranged in the fan-shaped rotor module, and a permanent magnet group is embedded in the fan-shaped rotor module; main electromagnetic harmonic waves are offset from the source, magnetism gathering and resistance increasing functions are decoupled, the mechanical robustness and the electromagnetic performance of the motor are improved, meanwhile, overall machining is converted into standardized module assembling, the manufacturing cost and the maintenance difficulty are reduced, different motor pole numbers can be flexibly adapted, and the service life of the motor is prolonged. The method is suitable for high-end application scenes such as new energy automobiles, industrial driving and aerospace.

The permanent magnet synchronous motor (50) is provided with a stator (8), a plurality of teeth (2T) arranged on the stator (8) at equal intervals in angle, and coils (1) wound on the plurality of teeth (2T) in a concentrated winding manner. The coils (1) form a three-phase delta connection. In a magnetic closed circuit, a magnetic flux generated from a coil (1) wound around one of two adjacent teeth included in a plurality of teeth (2T) passes through the tip portions of the two teeth, passes through a coil (1) wound around the other of the two teeth, and returns to the coil (1) wound around the one of the two teeth through the core seat portions of the two teeth. The magnetic resistance of the magnetic closed circuit when the coils (1) wound around the two teeth are in the same phase is smaller than the magnetic resistance of the magnetic closed circuit when the coils (1) wound around the two teeth are out of phase.

This invention belongs to the technical field of motor control and discloses a model predictive control method and system for effectively suppressing the second harmonic of a permanent magnet synchronous motor. The method includes the following steps: obtaining the three-phase input current of the permanent magnet synchronous motor at the current moment, converting the three-phase input current into a sum-i current in a coordinate system; extracting the two orthogonal components of the second harmonic at the current moment from the transfer function of the current input to a second-order generalized integrator; calculating the second harmonic component at the next moment using the two orthogonal components of the second harmonic at the current moment; compensating the fundamental current reference command at the next moment using the second harmonic component at the next moment, obtaining the compensated fundamental current reference command at the next moment, thus achieving the suppression of the second harmonic current at the next moment. This invention solves the problem of not suppressing the second harmonic in the control of permanent magnet synchronous motors.

The application belongs to the technical field of vehicle braking system, and discloses a segmented pole arc motor for an electronic mechanical braking system, a use method and a vehicle.The motor comprises a stator and an inner rotor, the stator adopts a split tooth structure, is provided with an alternating current armature winding and a direct current excitation winding, and the rotor is provided with segmented pole arc permanent magnets, so that the motor forms a hybrid excitation structure in which a permanent magnet magnetic field and an excitation magnetic field are superposed.Through segmented optimization of the pole arc of the permanent magnet, the air gap magnetic flux waveform is improved, the cogging torque and torque ripple are reduced, and the running stability is improved; equivalent flux linkage is controlled by adjusting the excitation current, the no-load speed is improved in the braking gap elimination stage, and the armature current and the locked-rotor copper loss are reduced in the clamping force following and maintaining stage.The cogging torque, torque ripple and locked-rotor copper loss are reduced in the structural level and the control level, and the application is suitable for stable and reliable work of the electronic mechanical braking system under various working conditions.

The invention discloses a synchronous reluctance motor rotor structure and a synchronous reluctance motor. The rotor structure comprises a rotating shaft and a rotor core installed on the rotating shaft. The rotor core is provided with a plurality of air magnetic barrier groups which are circumferentially distributed, the air magnetic barrier groups protrude towards the radial inner side of the rotor core, each air magnetic barrier group comprises a plurality of air magnetic barrier layers which are arranged in the q-axis direction, and a magnetic conductive layer is formed between every two adjacent air magnetic barrier layers; the cross section of each air magnetic barrier layer along the radial direction of the rotor is considered to be enclosed by two long boundary lines and two short boundary lines, and the two long boundary lines are respectively an inner side long boundary line and an outer side long boundary line which meet a circular curve parameter equation; two end points and two short boundary lines of the long boundary line of the air magnetic barrier layer meet other parameter equations; in the same air magnetic barrier group, the long boundary lines of different magnetic barrier layers adopt different circle centers to form an eccentric circle magnetic barrier. By combining the asymmetrically-designed eccentric circle magnetic barriers, the output torque of the synchronous reluctance motor can be improved, and the torque pulsation can be reduced.

A control device (50) of a motor generator (42) connected to an internal combustion engine (41) includes an estimation section (52) that estimates an estimated value of a torque ripple of the internal combustion engine, i.e., an estimated torque ripple, and a control section (53) that controls the motor generator to reduce generated power and suppress a decrease in a rotational speed of the internal combustion engine in a case where a negative torque that hinders rotation of the internal combustion engine occurs in the estimated torque ripple of the internal combustion engine.

The utility model relates to a kind of motor rotor structure for realizing rotor flux better sinusoidal distribution, belong to motor technical field, including protective shell, the protective shell is located in rotor, the rotor and protective shell are equipped with stator, the rotor is equipped with magnetic separation slot and magnetic filling slot, the magnetic filling slot is inserted and embedded permanent-magnetic strip, the permanent-magnetic strip includes permanent magnet I, permanent magnet II and permanent magnet III. Permanent magnet I and permanent magnet II, permanent magnet III superposition realizes rotor flux better sinusoidal distribution. Permanent magnet I, permanent magnet II, permanent magnet III and magnetic separation slot jointly form cross-axis magnetic circuit, due to the formation of reluctance torque superposition, thereby increase torque. By optimizing rotor magnetic pole shape, permanent magnet arrangement and auxiliary structure are realized, to reduce harmonic content, improve torque stability. Realize the good sinusoidal distribution of rotor flux, low motor torque ripple and slot effect, to improve the stability of motor operation, efficiency and control accuracy.

This invention relates to the field of electric motors, and more particularly to an electric motor rotor. The electric motor rotor includes: a trapezoidal slot formed on the outer circumferential surface of the motor rotor, the trapezoidal slot having a base edge; a magnet slot, the axis of symmetry of the magnet slot passing through the center of the inner diameter of the motor rotor, the trapezoidal slot being formed on at least one side of the axis of symmetry of the magnet slot, the magnet slot having a first side line; and a magnetic stabilizing hole formed between the outer circumferential surface of the motor rotor and the magnet slot, the longitudinal axis of the magnetic stabilizing hole being perpendicular to the first side line, the magnetic stabilizing hole and the trapezoidal slot being on the same side of the axis of symmetry of the magnet slot, the axis of symmetry of the trapezoidal slot passing through the center of the inner diameter of the motor rotor, an angle α1 between the longitudinal axis of the magnetic stabilizing hole and the axis of symmetry of the trapezoidal slot, and an angle α2 between the longitudinal axis of the magnetic stabilizing hole and the axis of symmetry of the magnet slot, α1 and α2 satisfying 0.701≤(α1-α2) / α1≤0.958. This invention also relates to an electric motor. This invention can effectively reduce the no-load back EMF harmonics of the motor, improving motor efficiency and operational smoothness.

The utility model discloses a rotor punching sheet, a driving motor and a vehicle, the rotor punching sheet comprises a punching sheet body, the punching sheet body is provided with a plurality of magnetic pole units along the circumferential direction, each magnetic pole unit is provided with an inner layer magnetic steel groove group and an outer layer magnetic steel groove group, the outer-layer magnetic steel groove group is arranged on the outer side of the inner-layer magnetic steel groove group in the radial direction of the punching sheet body; the inner layer magnetic steel groove group and the outer layer magnetic steel groove group are V-shaped; two first auxiliary grooves are formed in the outer circle of each magnetic pole unit, and the two first auxiliary grooves are symmetrical about the central axis of the inner-layer magnetic steel groove group; the punching sheet body is provided with a circle center, the included angles between the two end points of the inner-layer magnetic steel groove group in the circumferential direction of the punching sheet body and the circle center are beta, and the positions of the first auxiliary grooves are related to the included angles beta. According to the utility model, the torque ripple of the motor can be reduced, the counter potential waveform sine degree of the motor is improved, the electromagnetic force of the motor is reduced, and the NVH of the motor is improved.

The invention discloses an asymmetric multi-magnetic-circuit variable-flux memory motor with a magnetic field offset effect, which comprises a stator, an armature winding and a rotor, the rotor comprises a plurality of poles, each pole is provided with a first permanent magnet layer and a second permanent magnet layer, the first permanent magnet layer comprises a plurality of first low-coercivity permanent magnets, and the second permanent magnet layer comprises a plurality of second low-coercivity permanent magnets. The second layer of permanent magnets comprises high-coercive-force permanent magnets and second low-coercive-force permanent magnets, and the first layer of permanent magnets of each pole are located between the high-coercive-force permanent magnets and the second low-coercive-force permanent magnets of the second layer of permanent magnets of the pole; and the high-coercivity permanent magnets of the second layer of permanent magnets of each pole are adjacent to the second low-coercivity permanent magnets of the second layer of permanent magnets of the adjacent pole. Through the double-layer permanent magnet structure and the asymmetric magnetic circuit design, the problems of magnetic flux saturation and sharp output torque drop of the conventional symmetric magnetic circuit memory motor in a weak magnetic state are solved.

This invention discloses a low-leakage flux asymmetric magnetic pole rotor and magnetic pole motor, comprising rotor laminations with eight magnetic pole regions uniformly arranged on the laminations. A first, second, third, and fourth permanent magnet group are sequentially repeated twice on the eight magnetic pole regions. Multiple identical rotor laminations are stacked and welded to form a rotor core. The magnetic pole polarities of any two adjacent permanent magnet groups in the eight magnetic pole regions are opposite. The permanent magnetic field within a single magnetic pole is asymmetric, and the permanent magnetic fields of adjacent magnetic poles are also asymmetric, reducing cogging torque, torque pulsation, and vibration noise. Each magnetic pole consists of multiple layers of permanent magnet steel and a magnetically insulating air gap, resulting in significant magnetic focusing effect, high magnetic field strength, high power density, low air gap harmonic magnetic flux density, low hysteresis loss, low stator core eddy current loss, and high motor output efficiency.

The application discloses an axial electric excitation mixed magnetic pole motor and belongs to the technical field of power generation, power transformation or power distribution. The motor comprises a stator, a rotor, a permanent magnet, an armature winding, an inner magnetic yoke, an outer magnetic yoke and an excitation winding, and two kinds of structurally similar but different motors can be generated through different matching forms among the components. The inner and outer magnetic yokes arranged in the stator and the rotor provide a magnetic flux path for the axial excitation of the two kinds of motors. One structure has a wide range of magnetic adjustment effect, and the excitation winding is connected with currents in different directions to increase or decrease the magnetism; the other structure has a complementary magnetic adjustment fault tolerance effect, when any section has an armature winding short circuit fault, the excitation current is applied to make the whole rotor periphery of the section present the same polarity, greatly weaken the peak-peak value of the magnetic linkage intersected by the armature winding of the section, inhibit the short circuit current, and the polarity of the rotor core pole of the non-fault section adjacent to the fault section is enhanced, so that the peak-peak value of the magnetic linkage intersected by the winding of the non-fault section is improved.

The application provides a rotor core and a motor with the same. The rotor core is formed with a plurality of magnetic poles which are arranged at intervals along the circumference of the rotor core. The outer periphery of the cross section of each magnetic pole comprises a plurality of arc lines and a plurality of straight lines, and the plurality of arc lines and the plurality of straight lines are arranged alternately. The air gap magnetic field between the stator core and the rotor core is optimized, the torque ripple is reduced, the motor demagnetization resistance and the motor efficiency are improved. The stator tooth is opposite to the magnetic pole and comprises a tooth body and a tooth shoe. The tooth shoe comprises two tooth shoes which are arranged at the two radial sides of the tooth body respectively. The tooth body corresponds to the first arc line, and the tooth shoe corresponds to the straight line. The magnetic field in the region between the tooth body and the first arc line is the strongest, the magnetic field in the region between the stator slot and the second arc line is the weakest, and the magnetic field in the region between the tooth shoe and the straight line is in the middle. The position and size of the straight line can be adjusted to adjust the magnetic field in the region. The motor iron loss is greatly reduced, the magnetic steel utilization rate is improved, and the motor harmonic loss is reduced.

The application relates to the technical field of energy motors, and discloses an air dual-power energy motor, which comprises a shell, a dual-power mechanism is assembled in the shell, an air inlet pipe is fixedly connected to the outer wall of the shell, an air outlet pipe is fixedly connected to the outer wall of the shell, and a motor bearing is fixedly connected to the front inner wall of the shell; the dual-power mechanism comprises a fixed plate, the fixed plate is fixedly sleeved on the outer wall of the arc surface of the motor bearing, a connecting plate is fixedly connected to the front of the fixed plate, a first flow guide block is fixedly connected to the front of the connecting plate, and a second flow guide block is fixedly connected to the back of the fixed plate. The first flow guide block and the second flow guide block are arranged in series on the same motor bearing, so that the same high-pressure airflow sequentially passes through two-stage power structures to realize twice gradient capture work, energy waste caused by direct dissipation of airflow impact of a traditional single-stage motor is effectively avoided, and an efficient energy conversion mode of one-shaft dual-drive and two-stage utilization is realized.

The present application relates to a kind of functionization outer diameter unequal thickness magnetic ring and its magnetizing method, belong to permanent magnet motor technical field, the inner diameter of unequal thickness magnetic ring is circular, and the outer diameter is change curve, wherein, the change curve of outer diameter is constant in main magnetic pole portion thickness, and the thickness is reduced in the transition position between adjacent main magnetic pole portion;The unequal thickness magnetic ring adopts bonded neodymium iron boron material.The present application is composed of a functionization outer diameter bonded neodymium iron boron magnetic ring and its matching multipole magnetizing fixture, wherein the outer diameter of magnetic ring adopts two kinds of functionization size, by reducing the thickness of magnetic pole transition area, the harmonic component of surface magnetism of magnetic ring is controlled, and the amplitude of cogging torque is reduced.The multipole magnetizing core of matching magnetizing fixture can magnetize magnetic ring into surface alternately distributed multiple magnetic poles.

This invention provides a slanted-pole permanent magnet synchronous motor. The stator is fixed inside the motor housing, and the rotor is fixed on the output shaft. The output shaft is movably mounted inside the motor housing via a bearing seat and a rolling bearing. The rotor is movably positioned within the inner ring of the stator. This invention has the following advantages: By setting an air intake hood and a dust filter assembly inside the rear cover, the upper part of the dust filter assembly is movably connected via a shaft pin, and the lower left part is connected to a return spring via a telescopic rod. In conjunction with the push rod on the air intake fan, when the air intake fan rotates, the push rod allows the dust filter assembly to swing back and forth under the action of the return spring, and a certain degree of vibration can occur. This facilitates the removal of dust adhering to the dust filter assembly from the filter cloth surface. Combined with the air intake fan, cold air can directly act on the stator and rotor, improving the cooling effect and preventing dust from entering the stator and rotor, thus protecting the stator and rotor.

The utility model provides a kind of rotor structure for reducing permanent magnet motor electromagnetic vibration force, belong to motor technical field.Solve the technical problem of excessive electromagnetic vibration force and excessive vibration noise caused by retaining the original asynchronous motor unskewed stator when asynchronous motor is transformed into permanent magnet motor.It includes rotating shaft, end plate, permanent magnet and rotor core, the rotor core is formed by a plurality of stamping pieces, a plurality of stamping piece slots are formed after stacking, the permanent magnet is embedded in the stamping piece slot, the rotating shaft is installed in the inner hole of the rotor core, the end plate is arranged at the axial ends of the rotor core, the stamping piece is provided with air magnetic bridge, the air magnetic bridge is arranged along the outer circle direction of the stamping piece, and the extension shape of the air magnetic bridge matches the outer circle arc of the stamping piece.It is mainly used for reducing the electromagnetic vibration and noise of the permanent magnet motor transformed from asynchronous motor.

The embodiment of the application discloses a rotor motor driving system, and the rotor motor driving system provided by the embodiment of the application comprises a driving motor and a hybrid rotor, the hybrid rotor is arranged on a rotating shaft of the driving motor, the hybrid rotor has a first section and a second section, the second section has four first magnetic poles, each first magnetic pole has two V-shaped magnetic parts and a U-shaped magnetic part.In the technical solution, the tangential magnetic field generated by the V-shaped magnetic part and the radial magnetic field of the U-shaped magnetic part are superposed, so that the air gap magnetic density waveform is closer to a sine, compared with a traditional scheme in which only the V-shaped magnetic part is used, the technical solution can effectively reduce torque ripple.Meanwhile, the U-shaped magnetic part forms a closed magnetic circuit, cooperates with the open magnetic circuit of the V-shaped magnetic part, and can improve the magnetic flux utilization rate.Furthermore, the U-shaped magnetic steel and the V-shaped magnetic steel can form a multi-stage mechanical structure, and can reduce the centrifugal stress when the hybrid rotor rotates at high speed.

The utility model discloses a high rotating speed motor rotor punching sheet, comprising a silicon steel sheet body, a plurality of arc-shaped projections arranged on the outer peripheral surface of the silicon steel sheet body, flat magnetic grooves arranged on the silicon steel sheet body corresponding to the inner sides of the arc-shaped projections, air grooves arranged at two ends of the flat magnetic grooves, and a shaft hole arranged at the central position of the silicon steel sheet body. The hole edge of the shaft hole is provided with a plurality of concave positions, and lightening holes and balancing holes are formed in the peripheral positions corresponding to the shaft hole. A ventilation recess is formed between two adjacent arc-shaped projections, so that the temperature of the rotor punching sheet and the magnetic steel can be effectively reduced. Moreover, the arc-shaped protrusions can reduce the harmonic component of the air gap, reduce the torque pulsation, and enhance the structural strength of the stator punching sheet. The flat magnetic grooves are used for inserting the magnetic steel, and air can flow through the air grooves at the two ends of the flat magnetic grooves to assist in heat dissipation, so that the rotor is subjected to heat dissipation in the operation process, and the operation performance of the motor is ensured. Meanwhile, the concave position is arranged, an air channel is added, the heat dissipation effect is further improved, and the temperature of the motor during operation can be reduced; the balance holes can effectively keep dynamic balance of the rotor, and vibration and noise are reduced. The lightening holes not only reduce the weight of the rotor, but also facilitate the improvement of the efficiency of the motor and the reduction of energy consumption, especially at a high rotating speed, the influence of mass on the balance and high-speed operation of the rotor is reduced, and the high-rotating-speed performance of the rotor is improved.

The invention provides a rotor assembly of a self-starting permanent magnet auxiliary synchronous reluctance motor and a motor, the rotor assembly comprises a rotor iron core and permanent magnets, the rotor iron core comprises an outer layer filling groove, an inner layer filling groove, permanent magnet grooves, a shaft hole and a rotor excircle, the shaft hole is located at the central axis position of the rotor iron core, and the permanent magnet grooves are located in the outer layer filling groove. The permanent magnet grooves are located in the periphery of the shaft hole so that the permanent magnets can be arranged in the permanent magnet grooves, the inner-layer filling grooves are located between the permanent magnet grooves and the outer circle of the rotor, and the outer-layer filling grooves are located between the inner-layer filling grooves and the outer circle of the rotor. The permanent magnet grooves, the inner-layer filling grooves and the outer-layer filling grooves form a magnetic barrier layer in the radial direction of the rotor, and the inner-layer filling grooves and the outer-layer filling grooves are filled with conductive conductors. According to the self-starting permanent magnet auxiliary synchronous reluctance motor, the problem of low starting torque of the self-starting permanent magnet auxiliary synchronous reluctance motor in the prior art can be solved.

The present invention discloses a method for improving the accuracy of a synchronous reluctance motor position sensorless vector control system. The method adopts a filter-free current polarity identification method and a dead zone voltage compensation method to perform dead zone compensation on a position sensorless vector control system using a square wave injection method, effectively avoiding the use of a large number of filters in traditional systems, improving the system response speed and dead zone compensation accuracy, reducing the controller computing load, and retaining the advantages of the square wave injection method position sensorless vector control method to the maximum extent. After dead zone compensation, the position observation accuracy can also be greatly improved, thereby improving the stability and dynamic response performance of the motor operation and reducing torque pulsation. Under the condition of no filter, a compensation voltage vector switching mechanism including two hysteresis angles is introduced, thereby weakening the influence of the angle fluctuation of the dead zone harmonic current on the dead zone compensation effect.

The utility model discloses a coreless brushless motor for a nail polishing tool, which comprises a casing, a front cover and a rear cover, a rotor assembly and a stator assembly are arranged in the casing, the rotor assembly is arranged in the stator assembly in a penetrating manner, and the stator assembly comprises a stator iron core and a three-section coil winding. The three coil windings are arranged in the stator core in a penetrating mode and tightly attached to the inner side wall of the stator core, the central angle of each coil winding is 120 degrees, circumferential symmetry is formed, a single-layer or double-layer varnished wire centralized winding is embedded in each coil winding, varnished wires are spirally wound in the radial direction of a wire cup, and the phase difference between every two adjacent coil windings is 120 degrees. A heat dissipation groove is formed in the bottom of each coil winding, and the end part of each coil winding is arc-shaped. The heat dissipation area is increased through the three-petal symmetrical design, and the temperature rise is reduced through the heat dissipation grooves; vibration noise is low, magnetic field distribution is uniform, and torque pulsation is reduced; miniaturization: the concentrated winding saves space, and meets the requirement for miniaturization of manicure tools; manufacturing is convenient, and automatic winding is facilitated through the modular wire cup structure.

The invention provides a rotor structure and a motor. The rotor structure comprises a rotor body and a plurality of magnetic bodies. The rotor body comprises a rotor yoke part and a plurality of rotor salient poles, the rotor salient poles are arranged on the outer circumferential surface of the rotor yoke part, and the plurality of rotor salient poles are arranged at intervals along the circumferential direction of the rotor yoke part; a mounting groove is formed between every two adjacent rotor salient poles; the magnetic bodies are arranged in the mounting grooves, and the plurality of magnetic bodies and the plurality of rotor salient poles are alternately arranged; grooves are formed in the side faces, making contact with the magnetic bodies, of the rotor salient poles. The motor comprises the rotor structure. The grooves are formed in the side faces, making contact with the magnetic bodies, of the salient poles of the rotor, magnetic leakage can be reduced, the sine degree of air gap flux density can be improved, the use amount of the magnetic bodies is reduced, meanwhile, counter electromotive force is effectively improved, the harmonic content of the counter electromotive force is reduced, and the operation performance of the motor can be improved, such as torque pulsation and noise reduction.

The application discloses a motor control method, a controller, a motor, a refrigerator, a medium and a program product. A direct-current bus voltage and a cross-axis current of a motor are acquired, and a direct-axis voltage and a cross-axis voltage are acquired. An initial direct-axis current is generated through field weakening control according to the direct-axis voltage, the cross-axis voltage and the direct-current bus voltage. A target frequency disturbance component caused by direct-current bus voltage fluctuation and a direct-current component used for field weakening control are separated from the initial direct-axis current. A phase of the target frequency disturbance component is calculated and optimized to obtain a target alternating current component, with minimization of a harmonic component of the target frequency in the cross-axis current as an optimization target. A direct-axis reference current is synthesized according to the target alternating current component and the direct-current component, and the motor is controlled according to the direct-axis reference current. In the working condition of the direct-current bus voltage fluctuation, energy backflow can be effectively inhibited, current harmonics can be reduced, torque pulsation can be reduced, and the running stability of the motor can be improved.

The invention discloses an electric drive system rotary transformer zero position self-learning and curing system, which comprises a mechanical alignment module for driving a motor rotor to rotate to a preset mechanical zero position and generating a zero position offset value; after the motor reaches the rated rotating speed, the control module sends a rotary transformer zero-position self-learning enable signal, so that a motor controller executes current closed-loop control based on a zero-position offset value, a d-axis current instruction in a rotor synchronous rotating coordinate system is set to be a negative value and a q-axis current instruction is set to be zero, and an actual torque value is obtained; the zero calibration module obtains an average torque value through the actual torque value, calculates the deviation between the average torque value and a zero reference torque value, and when the deviation is larger than a positive deviation threshold value or smaller than a negative deviation threshold value, adjusts a zero offset value and triggers the control module to recollect the actual torque value; and obtaining a final zero offset value until the deviation is smaller than or equal to the positive deviation threshold value and larger than or equal to the negative deviation threshold value. The torque control precision and the operation reliability of the electric drive system are improved.

The invention belongs to the technical field of alternating current motors and driving control, discloses a three-phase series winding motor three-dimensional space vector modulation strategy and an overmodulation processing method, and aims to improve the control performance of a three-phase series winding motor and provide positive zero-sequence current suppression capability. The invention provides a three-phase series winding motor three-dimensional space vector modulation strategy based on a space slicing method and an overmodulation strategy thereof, a series winding motor three-dimensional linear modulation area is effectively expanded, a simple and effective basic voltage vector selection table is provided, and an accurate linear modulation area mathematical model is given. In addition, a corresponding three-dimensional overmodulation method is provided, and the control performance of the series winding motor in a linear modulation area and an overmodulation area is improved.

The application discloses a kind of servo connecting rod high-frequency swing mechanisms, belong to bearing processing equipment technical field, the mechanism includes: the same side of adjusting member and swing head being arranged on support outside;Transmission shaft, is driven by motor, and one end is connected with adjusting member;Swing shaft, one end is connected with swing head;Connecting rod, both ends are respectively eccentric to transmission shaft and swing shaft, and are respectively rotationally connected adjusting member and swing head;Wherein, adjusting member is used to adjust the eccentric distance of connecting rod relative to transmission shaft along radial direction.The application cancels the belt link by direct drive transmission, servo motor coupling directly drives transmission shaft, reduces power loss, and improves swing frequency and stability.