153results about How to "Reduce distortion rate" patented technology

The utility model relates to a voltage type source rectifier stable control system and method based on LCL filter wave, belonging to the source rectifying technical range of electronic technology. The system comprises a DC voltage control cell, a current control cell, an active damp control cell and a voltage space vector generating cell. the utility model produces six PWM signals to gain the current signal of the filter wave capacitor branch directly or indirectly, outputs the reference value of the damp voltage and achieves the stable control on the system. The method provides an adjustable sine control on the DC voltage output and input current through the active damp vector control of the voltage type source rectifier stable control system, the damp voltage reference value outputted by the active damp vector control cell, and the network voltage to execute summation operation. The utility model has the advantages of controllable DC voltage, low aberrance rate of the network input current, high power factor, satisfying the requirement of energy double-redirection flowing, and achieving the stability of the system without increasing the quantity of hardware damp resistance.

The invention discloses a method for predicting direct power of an improved T type three-level permanent magnetic direct drive wind power system. A topological structure of the permanent magnetic direct drive wind power system is an improved T type three-level converter. According to an SVPWM technology, the problem that a switching frequency is not fixed, the system loss is reduced and a power factor of the system is improved. A machine side converter control strategy is a prediction direct power control strategy. A rotating speed loop is an external loop. A power loop is an internal loop. The power loop is prediction power control. A PI adjustor is not required. A control structure is simple and an effect is good. A network side direct power control strategy is a direct power control strategy based on virtual flux orientation. A power network voltage does not need to be sampled. A structure is simple. The system cost is reduced. The dynamic stability is improved. The prediction direct power control strategy and the direct power control strategy based on virtual flux orientation are based on space vector pulse width modulation (SVPWM), so the system has a fixed switching frequency and unit power factor.

The invention discloses a parallel inverter system capable of realizing structure reorganization and a control method of the system. Structure reorganization of the parallel inverter system can be realized at any time through control on IGBT (insulated gate bipolar transistor) switch states of inverters, a parallel inverter structure is endowed with a function for parallel connection / removal of the inverters at any time, that is, under the condition that the parallel inverter system works, the N inverters can be connected in parallel or disconnected randomly so as to be matched with loads, and the overall efficiency of the system is improved; the structure has the function for parallel connection / removal of the inverters at any time, that is, under the condition that the parallel inverter system works, the N inverters can be connected in parallel or disconnected randomly; active power control and reactive power control can be provided simultaneously, meanwhile, ZSCC (zero-sequence circulating current) suppression can also be realized through adoption of prediction control on the redundant zero switch state; besides, the system does not affect current and voltage vectors on the alternating current side.

The invention discloses a super-low-speed high-torque motor and a crane with the motor. The motor comprises an outer rotor and a stator. The stator is provided with a stator temperature sensor for collecting a temperature signal within the stator. The outer cylinder inner side of the outer rotor is fixedly equipped with a plurality of permanent magnets which are the same tile-shaped hexahedral structures and are regularly arranged along a circumferential direction and an axial direction. A plurality of permanent magnets are arranged in any circumferential and any axial direction. Two circumferential side faces of the permanent magnets are inclined plane shapes with inside cutting angle shapes, and the angle of a cutting angle is 5 degrees to 35 degrees. According to the crane with the motor, the outer cylinder of the motor is used as the winding drum of a lifting mechanism. The motor can normally run in the condition of low speed (super low speed) and large torque, the operation is stable, the vibration is small, the noise is small, the temperature rise is small, and the motor is mainly used for a crane, a port machine, a tower crane, an elevator, a winding machine and other similar occasion.

The invention discloses an electric energy transmission device based on an isolated full-bridge boosting converter circuit structure and a control method thereof. The electric energy transmission device comprises a fuel battery which is capable of outputting a low voltage direct current, a boosting converter which is electrically connected with the fuel battery and outputs a high voltage direct current, an inverter which inputs the high voltage direct current and outputs a stable alternating current, and a filter used for filtering out higher harmonics, wherein a fly-back winding is arranged on an input inductor of the boosting converter, an output end of the fly-back winding is connected with an output end of the boosting converter, and a loop is formed for releasing the energy in the input inductor. The invention further discloses a control method of the electric energy transmission device based on the isolated full-bridge boosting converter circuit structure. The electric energy transmission device has the advantages that the output voltage is stable, the controllability is high and the charging time is short.

The invention provides a micro-grid inverter control method based on an improved virtual synchronous generator, which relates to the technical field of micro-grid inverter control. The method includesthe following steps: collecting the output parameters of a micro-grid inverter, converting the output parameters into corresponding values under a d-q coordinate system, and obtaining a mathematicalmodel of the micro-grid inverter under the d-q coordinate system; calculating the active power and reactive power output by the micro-grid inverter; using a virtual speed governor and a virtual excitation regulator to obtain the virtual mechanical power and terminal voltage of a virtual synchronous generator; obtaining a reference voltage through an improved VSG rotational inertia control algorithm; and finally, using the obtained reference voltage as the input of an improved voltage and current loop, and outputting a pulse width modulation signal to drive a power device of the micro-grid inverter so as to control the micro-grid inverter. The micro-grid inverter control method based on an improved virtual synchronous generator provided by the invention enables a micro-grid inverter under islanded operation conditions to have the ability to support the grid voltage stability and make fast frequency response.

The invention discloses a stabilization control method of a VSC-HVDC power transmission system. The stabilization control method comprises a virtual resistance-inductance impedance stabilization control part, an output current feedforward control part, and a voltage current double-loop control part According to the virtual resistance-inductance impedance stabilization control, equivalent output impedance of a rectification station converter is corrected to be positive resistance, the damping of the system is enhanced, and the stability of the system is effectively improved, and the direct current side oscillation of the VSC-HVDC power transmission system is inhibited. According to the output current feedforward control, influences of receiving end load power abrupt changes on direct current busbar voltage are reduced, and the transient response performance of the system is improved. A direct current voltage outer ring adopts proportional plus integral control, and is used to track a direct current voltage instruction in an astatic way, and a grid-connected current inner ring adopts feedforward decoupling control under synchronous rotation coordinates, and then relatively low grid-connected current aberration is guaranteed. The stabilization control method is used for the control of the rectification station converter of the VSC-HVDC power transmission system, and the direct current side oscillation of the VSC-HVDC power transmission system is effectively inhibited, and the dynamic performance of the inversion station converter cannot be affected.

The invention discloses a middle point voltage control device and method based on modulation wave interval division. The device comprises a three-level inverter, a digital processing control module and a driving circuit, wherein the digital processing control module comprises a sampling unit, a closed-loop control unit, a sine pulse width modulation unit, a modulation wave interval division unit and a zero-sequence component calculation unit. The method comprises steps that an offset angle of a zero-crossing point after adding a zero-sequence component to a three-phase modulation signal is calculated; the modulation wave interval is divided, and the zero-sequence component required to suppress the midpoint voltage fluctuation is calculated; the sign of the zero sequence component is determined through comparing instantaneous voltages of upper and lower capacitors of the DC side; the zero-sequence component is added to the three-phase modulation signal and is then processed by the sinepulse width modulation unit to acquire a pulse width modulation control signal, and a switch tube of the three-level inverter is controlled by the driving circuit for operation. The device is advantaged in that hardware cost is low, accurate control is realized, the application scope is wide, the midpoint voltage fluctuation can be effectively inhibited, and the distortion rate of the network current is reduced.

The present invention discloses a current prediction control method for two-level three-phase grid-connected inverter. The method comprises the steps of collecting the voltage of a three-phase grid and a grid-connected current signal in real time, using the voltage of the three-phase grid and the grid-connected current signal collected in real time and a two-level three-phase grid-connected inverter model in a three-phase static coordinate to carry out two-phase static alpha beta coordinate conversion and obtaining the output voltage vector needed by the two-level three-phase grid-connected inverter, selecting the optimal effective voltage vector of the two-level three-phase grid-connected inverter according to the obtained output voltage vector needed by the two-level three-phase grid-connected inverter and obtaining the optimal action time of the optimal effective voltage vector, and using the optimal action time of the effective voltage vector to obtain the switch-on and switch-off times of an inverter switch element, and thus realizing the control of the output current of the two-level three-phase grid-connected inverter. According to the prediction control method of the invention, the current tracking effect can be improved, the distortion rate is reduced, and thus the switch change becomes regular.

The invention relates to a low distortion wide-angle lens, including a first lens, a second lens, a third lens, a aperture, a fourth lens, a fifth lens, a sixth lens and a seventh lens along the optical axis from the object side to the image side arranged in sequence. The first lens, the second lens, the fourth lens and the seventh lens are negative focal lenses. The third lens, the fifth lens andthe sixth lens are positive focal lenses. The fourth lens and the fifth lens form a glued lens group. The first lens and the second lens bend to the aperture. The low distortion wide-angle lens according to the invention has the advantages of wide field angle and low distortion.

The invention relates to a serial-magnetic-circuit hybrid-excitation permanent magnet motor, which comprises a case. A stator consisting of stator core and a stator winding, and a rotor consisting of a permanent magnet, a rotating shaft, a rotor core, an excitation winding and a nonmagnetic material are installed in the case. The stator winding is distributed in a slot which is circumferentially arranged in the stator core. The permanent magnet and the excitation winding are arranged on the rotor core. Magnetic motive force sources established by the permanent magnet and the excitation winding are connected in series in the form of magnetic circuits. The nonmagnetic material is arranged between the rotor core and the rotating shaft. By adjusting the current of the excitation winding, the air-gap magnetic field of a motor can be conveniently adjusted. The excitation winding is only used for realizing the auxiliary adjustment of the air-gap magnetic field and the effect of the permanent magnet is fully exerted; the main magnetic field adjusting capacity is better; the structure of the serial-magnetic-circuit hybrid-excitation permanent magnet motor is similar to the structure of a common synchronous motor, the power density is higher, and the optimization design of the motor winding and the magnetic pole shape is facilitated to obtain sinusoidal voltage waveform; and an additional air gap and an axial magnetic circuit do not exist.

The invention belongs to the technical field of electricity and relates to a single-stage photovoltaic grid-connected micro inverter and a control method thereof. The primary side of an isolation transformer achieves bidirectional excitation only through one switch tube, and the switch tube can achieve zero-voltage connection and disconnection and at the meantime transmit energy to the secondary side of the isolation transformer; the secondary side of the isolation transformer comprises two sets of high-frequency full-wave rectification circuits, which are controlled to output at a power frequency and then connected in parallel back to back, and is combined with modulation of a high-frequency switch tube of the primary side of the isolation transformer to form a pulse sequence changing by sinusoidal modulation rules and then filtered into grid-connectable power-frequency alternate current. The single-stage photovoltaic grid-connected micro inverter is simple in structure, small in size, low in cost and high in efficiency and reliability, and can be applied to other small grid-connected inverters besides photovoltaic grid-connected micro inverters; after island detection and phase lock programs are eliminated, the single-stage photovoltaic grid-connected micro inverter can be applied in a generalized mode to vehicle-mounted inverters, USB (universal serial bus) power sources, frequency converters and isolated boost DC-AC (direct current-alternate current) converters.

The invention belongs to the field of textile materials, and relates to a permanent electromagnetic radiation resistant fabric. According to the technical scheme, warp and weft yarns of the permanent electromagnetic radiation resistant fabric are flexible fibers; an electromagnetic radiation resistant coating is arranged on the surface of the fabric and consists of the following raw materials in percentage by weight: 1-10 percent of polyvinyl alcohol, 0.1-3 percent of polyvinyl acetate emulsion, 1.8-2.8 percent of hydroxymethyl cellulose, 15-50 percent of nano metal particles and the balance of water. The permanent electromagnetic radiation resistant fabric disclosed by the invention can shield electromagnetic waves, and the shielding rate is over 99.9 percent; the shielding performance is over 54dB, and the popularization signification is great.

The invention discloses a special diet edible food formula for improving sperm quality of males and a preparation method of the formula and belongs to the field of special diet edible food. Whey protein, sea cucumber polypeptide, oyster polypeptide, bone collagen peptide, soybean peptide, corn oligopeptide, wheat oligopeptide and casein phosphopeptides are used as basic raw materials, edible and medicinal raw materials including raspberries, fructus lycii, cortex cinnamomi and the like are added, wall-broken piney flower powder, spirulina platensis powder, a roxburgh rose extract, a maca extract, cordyceps militaris and fructooligosaccharide are matched, so that the special diet edible food is formed. The formula product is formed through steps of raw material pretreatment (cleaning, enzymolysis, extraction and the like), crushing, sieving, mixing and the like. The formula components are all food materials, and the prepared product has functions of increasing sperm density, increasingsperm motility rate, reducing sperm aberration rate and improving immunity and fatigue resistance. The product has high safety, has no toxic or side effects, has low fishy smell and bitterness and canbe eaten for a long term.

The invention discloses a micro-current measuring circuit for dielectric response tests; the micro-current measuring circuit comprises a logarithm operation unit, a linear optical coupler unit, an index operation unit, and a signal secondary amplification unit connected in sequence; the logarithm operation unit comprises an ultra low bias current amplifier and a negative feedback element; the linear optical coupler unit comprises a linear optical coupler chip and a negative feedback circuit; the index operation unit comprises a high speed operation amplifier and a photosensitive diode; the micro-current measuring circuit has no feedback resistor, so the measuring result cannot be affected by a resistance temperature coefficient, thus providing high temperature drift influence inhibition ability, and the temperature coefficient can reach 100ppm / C.

The present invention provides a temperature rise characteristic automatic detection device of a low-tension current transformer. The temperature rise characteristic automatic detection device comprises a control and data acquisition system, a current generation device, a low-tension current transformer, a switch, an electronic load and a temperature sensor. The control and data acquisition system is in bidirectional connection with the current generation device; the output end of the current generation device is connected in series with the input end of the low-tension current transformer; the output end of the low-tension current transformer is connected in parallel with the electronic load through the switch; and the temperature sensor is fixed on the low-tension current transformer. The detection device provided by the invention may complete characteristic automatic detection of a plurality of current transformers at once without personnel participation in the whole process, and therefore the detection efficiency is greatly improved.

The invention discloses a low-frequency offset three-phase multi-inverter parallel operation control method under a micro-grid island. Each inverter and an LC filter thereof under the micro-grid island are controlled to be voltage-controlled current sources; a reference frequency of fundamental current output by each inverter is a rated value; a reference phase can be obtained through a disturbance observation-based maximum output voltage tracking method; a reference amplitude of the fundamental current output by each inverter is obtained through common bus-based feedback proportional control; distribution of output current of each inverter according to the capacity proportion can be achieved by reasonably setting a proportion coefficient and a voltage amplitude on a micro-grid bus is controlled to be close to the rated value; a harmonic current reference output by each inverter is obtained through bus harmonic voltage feedback control; and quasi proportional resonant control in a static coordinate system is adopted as current tracking control of each inverter. According to the low-frequency offset three-phase multi-inverter parallel operation control method under the micro-grid island, the influence of the difference between line parameters on equal division of output current of each inverter is overcome, the frequency of the voltage in the micro-grid operation process is relatively stable and the influence of voltage frequency fluctuation on a load is reduced.

The invention relates to a sine wave disk type permanent magnet generator with a novel magnetic pole structure, which is particularly suitable for a disk type permanent magnet generator for the power generation of ships. The generator comprises a base, a stator disk, a rotor disk, a magnetic pole fixed on the rotor disk, an end cover, a rotation shaft and a bearing, wherein the magnetic pole consists of an even number of sector pole blocks fixed on the rotor disk; the sector pole blocks are uniformly distributed along the circumference around the center of the rotor disk and fixed on one side of the rotor disk facing to the stator disk; the side surface of one side of each sector pole block facing to the stator disk is in a step shape; a high step is arranged in the middle of the step shape, and low steps are symmetrically and gradually lowered toward the two sides; distance between two adjacent sector pole blocks is equal; the stator disk comprises a stator core and a stator winding; and the stator winding is a centralized integral pitch winding. The sine wave disk type permanent magnet generator with a novel magnetic pole structure, provided by the invention, has the advantages that: the generator has an air-gap flux density waveform with a relatively low sine aberration rate and a back-electromotive force waveform, the motor efficiency is improved, the magnetic pole is simple and convenient to mount and fix, and the wire insertion difficulty of the winding and the motor manufacturing cost are reduced.

The invention relates to an offshore wind power grid connection system based on full-bridge MMC DC-side serial connection and a control method thereof, and belongs to the technical field of offshore wind power grid connection. The grid connection system comprises a plurality of prime motors, a gear case, a wind power generator, an isolation transformer, a plurality of offshore platform devices composed of full bridge MMC, DC cables and a grid connection converter arranged on the land. The control method includes controlling amplitude of voltage at the full-bridge MMC AC side, controlling voltage at the full-bridge MMC DC side and controlling current at the DC side of the grid connection converter. High voltage is obtained through DC side serial connection, and the system and method are applicable to offshore wind power transmission. Converters and transformers are not needed in the system, the output power of the wind power generator can be controlled by adjusting the output voltage at the DC side of the full bridge MMC, and the current of a DC loop is controlled by the grid connection converter. The grid connection system and control method are simple for controlling, and easy to realize. The performance and extendibility are good.

The invention relates to a three-level NPC inverter zero-sequence circulation suppression method based on model prediction virtual voltage vector control. Through analyzing a space vector of a three-level inverter, seven voltage vectors contributing zero to zero-sequence circulating current are selected as basic vectors, and 12 virtual voltage vectors are synthesized through the basic vectors, sothat the distortion rate of output current of the parallel system can be remarkably reduced while the zero-sequence circulating current of the parallel system is effectively suppressed, the quality ofgrid-connected current is improved, and the method is very suitable for a three-level inverter system operating in parallel.

The invention relates to an external rotor motor. A rotor shell is internally and fixedly provided with a plurality of permanent magnets which are the same tile-shaped hexahedral structures and are regularly arranged along a circumferential direction and an axial direction. A plurality of permanent magnets are arranged in any circumferential and any axial direction. Two circumferential side faces of the permanent magnets are inclined plane shapes with inside cutting angle shapes, and the angle of a cutting angle is 5 degrees to 35 degrees. The outer edge of a permanent magnet cross section in a radial direction is a circular arc line shape whose center is at the axis of the rotor shell. The inner edge of the permanent magnet cross section in a radial direction is a single arc shape or a curved line formed by connecting a plurality of arc shapes mutually. The permanent magnets are made of high performance NdFeB materials, the lengths of the permanent magnets are between 30mm and 95mm, and the thicknesses of the permanent magnets are between 8mm and 18mm. The external rotor motor has the advantages of good stability, small vibration, low noise and high power in low-speed operation and is especially suitable for a drum direct drive crane lifting mechanism and the like.

The invention discloses an LCL type inverter grid-connected device based on parameter joint design and a control method. The device comprises a three-level inverter, a digital processing control module and a driving circuit, wherein the digital processing control module comprises a sampling unit, a closed-loop control unit, an active damping unit and a sine pulse width modulation unit. The methodcomprises the following steps: selecting the capacitance value of an LCL filter capacitor, a network side inductor and an inverter side inductor inductance value; determining a feasible range of a PRcontroller proportion parameter and an active damping feedback coefficient through Nyquist stability analysis in combination with a resonance suppression condition; and in the determined feasible region, using a Lagrange multiplier method to select a proper PR controller proportion parameter and an active damping feedback coefficient so that the control system obtains a large bandwidth and good dynamic performance. The device and the method have the advantages of being low in hardware cost, accurate in control and wide in application range, the harmonic component of the resonant frequency of the LCL filter can be effectively restrained, and the distortion rate of the network access current is reduced.

The invention discloses an active filter control method based on harmonic voltage selection compensation. According to the method, by introducing a base wave and step factors in sub-harmonic wave self-adaption filtering link, the weight coefficient of sub-voltage component is rapidly and accurately calculated through recursive iteration, and the defects that according to traditional sliding Fourier transform, the calculated amount is large and the resource consumption is large are overcome. The method includes the steps of achieving sub-harmonic voltage selection compensation by reconstituting sub-harmonic components, and adjusting sub-harmonic wave conductance gains through the self-adaption algorithm according to the magnitude of the sub-harmonic wave containing ratio. The method is not influenced by the route parameter uncertainty or the time-varying characteristics, and the defect of fixed gains is overcome. According to the active filter control method, when distortion of the system voltage is serious and the system runs in an asymmetrical mode, sub-harmonic wave voltage components can be accurately extracted, self-adaption adjustment of the conductance gains can be accurately conducted, the stability is high, and the tracing speed is high.

The invention discloses a pulse width modulation method for an H-bridge cascading-type inverter, and the method comprises the following steps: setting a specific function optimization target with the minimum harmonic current, and a nonlinear constraint with the H-bridge power balance; solving an initial switching angle value of a corresponding modulation degree through employing a genetic algorithm; solving an optimal switching angle value through employing a nonlinear programming function Fmincon; carrying out the planning of switching angle values in a whole modulation ratio range, and carrying out the serialization of the switching angle values in an allowed specific function index. The method employs a multilevel synchronization optimization pulse width modulation method to effectively solve problems of energy quality at low switching frequency and the instantaneous power balance of an H-bridge module, and is successfully used in the field of AC transmission.

The invention discloses a medicament with chondriomere distortion preventing function, wherein the medicament comprises the following raw materials (by weight portion), Chinese caterpillar fungus spore powder 2000-8000, zinc 80-120, selenium 2-3. The sperm distortion rate can be lowered by 20-25%.

The artificial insemination method for Chinese sturgeon adopts diluent A and diluent B as insemination medium and adopts double wet method to make operation. For the first time it uses the diluent A to wash ova and remove ovarian liquid, and for the second time it uses the diluent B to activate ova and spermatozoa and make the spermatozoa be uniformly dispersed to implement insemination. The described diluent includes diluent A and diluent B. The diluent A is made up by using NaCl, Kcl, CaCl2 2H2O, MgCl 6H2O, NaHCo3, Na2Co3, NaOH, citricacid, penicillin, streptomycin and distilled water, and the diluent B is obtained by using distilled water whose volume is 25 times that of diluent A to dilute the diluent A.

The invention mainly relates to a stator punching structure of a permanent magnet motor, and belongs to the technical field of permanent magnet motors. The air-gap magnetic flux density waveforms are optimized by cutting angles from two ends of a stator tooth; the ratio of a distance between two start points of each cut angle at a tooth part to the angle and the ratio of each stator tooth to the angle are set within a range of 0.4-0.6; the angle theta of each cut angle is set within a range of 5-15 degrees. According to the structure, the harmonic content of the air-gap magnetic flux density is reduced, loss and vibration noise of the motor are reduced, and the performance of the motor is improved. The punching structure is simple, is convenient to manufacture, is lower in cost and is suitable for popularization and application.

The invention discloses a serial-parallel impedance reshaping method of smooth busbar voltage, and is used for reducing equivalent output impedance under the condition of micro-grid drooping frequencydeviation and then suppressing the busbar voltage distortion caused by the non-linear load. The serial-parallel impedance reshaping method of the smooth busbar voltage has the advantages that serialconnection virtual resistance and parallel virtual admittance are combined, the output impedance of an inverter on a fundamental frequency of 50 Hz and integer subharmonic frequency is kept invariable, the equivalent output impedance after an output frequency offsets is reduced, thereby effectively improving the busbar voltage quality of a micro-grid inverter parallel system under the high-proportion non-linear load condition.

The invention discloses an improved repetitive control method suitable for a three-phase PWM inverter. A fractional-order repetitive controller is obtained through Lagrangian interpolation, and therefore, a voltage of a specified fluctuating frequency can be outputted, and at the same time, the dynamic response speed and steady state output accuracy of the device can be improved; state feedback control is additionally adopted to compensate the resonance peak of a compensation system, and therefore, the performance of the system can be improved, and the design of the repetitive controller can be facilitated; the repetitive controller is used to accurately track input signals, can achieve the zero-error tracking of a command voltage, and can completely suppress a non-command voltage, so thatadditional interference can be prevented from being introduced into system measurement; state feedback control and repetitive control are combined, so that stability and response speed can be well balanced; and with the repetitive control adopted, the dead zone effect of a switching device can be compensated, and the adverse effects of a dead zone on an entire control system can be reduced. Withthe method of the invention adopted, the output distortion rate of the PWM inverter can be significantly reduced, and the output accuracy and response speed of the PWM inverter under frequency varyingand voltage varying commands can be improved.

The invention discloses an asymmetric hybrid magnetic pole type permanent magnet motor. The asymmetric mixed magnetic pole type permanent magnet motor comprises a stator and a rotor, wherein the stator and the rotor are arranged in a sleeved mode inside and outside, and an air gap is formed between the stator and the rotor; the stator comprises a stator iron core and a three-phase armature winding; the rotor comprises a rotor yoke and a plurality of permanent magnet unit structures uniformly distributed on the rotor yoke in the circumferential direction; each permanent magnet unit structure comprises a multilayer magnetic barrier structure, a linear air magnetic barrier positioned on the outer side of the multilayer magnetic barrier structure, and built-in permanent magnets which are arranged in the multilayer magnetic barrier structure and the linear air magnetic barrier separately, wherein the circumferential angle corresponding to the multilayer magnetic barrier structure is alpha s, the circumferential angle corresponding to the linear air magnetic barrier is beta s, and the alpha s plus beta s is equal to 90 degrees. According to the permanent magnet motor, under the premise of a certain usage number of the permanent magnets, the permanent magnet torque and the magnetic resistance torque component can reach the maximum value at a close current angle based on the asymmetricdistribution of the permanent magnets, the torque component utilization rate is increased, and the torque output capability is improved.