26results about How to "Increased torque output capability" patented technology

The invention relates to the technical field of motor control, and discloses a control method and system of a permanent magnet direct current brushless slotless motor. The method comprises the following steps: performing temperature compensation and signal filtering on voltage data of a Hall sensor to obtain rotor position information and temperature characteristic data; performing magnetic field intensity dynamic compensation calculation according to the rotor position and the temperature data to obtain magnetic field intensity parameters; adjusting the amplitude and phase of the three-phase current according to the magnetic field intensity parameter, and generating a current control quantity; extracting and compensating a harmonic component to obtain a torque smooth control instruction; all losses are calculated and optimized, and efficiency optimization parameters are generated; and performing feature extraction and anomaly judgment on the operation parameters, and outputting a protection control strategy. Accurate detection of motor position signals, stable control of torque, optimal control of loss and real-time monitoring and protection of abnormal states are achieved under the high-temperature working condition, and therefore stable operation and the service life of the motor under the high-temperature environment are guaranteed.

The invention discloses a rotor protection sleeve based on a two-phase material and a preparation method, and relates to the technical field of motors. Comprising a sleeve body which is used for sleeving a rotor; the sleeve main body is divided into a plurality of magnetic conductive areas and a plurality of non-magnetic conductive areas in the circumferential direction; the plurality of magnetic conductive areas and the plurality of non-magnetic conductive areas are arranged in a staggered manner; the magnetic conduction area is tightly attached to the permanent magnet of the rotor, the position of the symmetry plane of the magnetic conduction area coincides with the d-axis position of the rotor, and the position of the symmetry plane of the non-magnetic conduction area coincides with the q-axis position of the rotor. According to the invention, the problems of poor mechanical strength, serious flux leakage, high eddy-current loss, low air gap flux density and the like of the motor rotor can be solved.

The invention provides a motor quick starting method and system based on a predictive current model, and relates to the technical field of control, and the method comprises the steps: carrying out the pre-positioning of a rotor in a static state, controlling a motor to enter a starting state, collecting a three-phase current, converting the three-phase current into a rotating coordinate system through coordinate conversion, and starting the motor. Determining gamma-axis actual current and delta-axis actual current in the rotating coordinate system, predicting the gamma-axis current of the rotating coordinate system by using the predicted current model to obtain gamma-axis predicted current, carrying out difference calculation on the gamma-axis predicted current and the gamma-axis actual current to obtain a predicted current error, and constructing a rotor position observer based on the predicted current model to obtain the rotor position of the rotating coordinate system. And S8, inputting the predicted current error into a rotor position observer, determining an estimated rotor position and a rotating speed, respectively sending the estimated rotor position and the rotating speed into a coordinate transformation controller and a rotating speed loop controller, carrying out rotating speed closed-loop control, and repeating the steps S2 to S8 to realize the motor quick start based on the predicted current model.

The invention discloses a series-parallel variable flux permanent magnet memory motor, which comprises a stator, an armature winding, a hybrid permanent magnet rotor and a non-magnetic rotating shaft, the stator comprises a plurality of stator yokes and iron core teeth arranged at the end parts of the stator yokes, armature windings are wound on the iron core teeth, the plurality of iron core teeth are encircled to form a circular hollow area, the hybrid permanent magnet rotor is arranged in the hollow area, the non-magnetic rotating shaft is arranged at the central position of the hollow area, and the hybrid permanent magnet rotor rotates around the non-magnetic rotating shaft. The problem that the size design of the permanent magnet is limited by the spatial position is effectively solved, the demagnetization resistance of the low-coercive-force permanent magnet and the flux weakening capacity of the motor are improved, multi-stage flux adjustment under different working conditions can be achieved, and the magnetic adjustment range is wider.

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 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.

The invention discloses an electromechanical integrated reaction momentum flywheel structure based on an air bearing, and belongs to the technical field of spacecraft attitude control equipment. Comprising a structure base, a rotating shaft, a porous air bearing, a motor rotor magnetic ring, a motor stator coil, an encoder magnetic ring, an encoder reading head, a bearing pressing ring, a flywheel and a shell, the structure base comprises a bottom base, a sleeve part and a bearing installation opening, and the rotating shaft comprises a flange, a magnetic ring installation shaft neck and a bearing installation shaft neck. The bearing installation shaft neck is arranged in a center hole of the porous air bearing in a penetrating mode, the motor rotor magnetic ring is tightly sleeved on the magnetic ring installation shaft neck, the motor stator coil is embedded between the sleeve portion and the motor rotor magnetic ring, a uniform gap is formed between the motor stator coil and the motor rotor magnetic ring, and the encoder magnetic ring is tightly sleeved on the lower end portion of the magnetic ring installation shaft neck. The encoder reading head is sleeved outside the encoder magnetic ring and is fixed with the bottom base; and a uniform gap is formed between the encoder reading head and the encoder magnetic ring. The device has the advantages of high reliability, long service life, low power consumption and high control precision.

The application relates to the field of motor technology, in particular to a SPOKE salient pole DD motor for a drum washing machine, which comprises a shell connected with an inner drum of the washing machine, a stator assembly connected with an outer drum of the washing machine and a rotor assembly installed on the shell, the rotor assembly comprises a rotor core and first permanent magnets and second permanent magnets arranged on the rotor core, the rotor core is arranged in a circular ring, a plurality of first permanent magnets and second permanent magnets are alternately arranged in sequence along the circumference of the rotor core, the first permanent magnets are arranged along the radial direction of the rotor core, and the second permanent magnets are arranged along the tangential direction of the rotor core. The application has the effects of improving the magnetic leakage problem of a conventional SPOKE salient pole DD motor, improving the motor performance and efficiency, and the motor in the scheme has low production cost and the structure is easy to mass-produce.

A permanent magnet motor rotor, a permanent magnet motor, a power assembly and a vehicle belong to the field of motors. The permanent magnet motor rotor comprises a rotor core; the plurality of permanent magnet groups and the plurality of third permanent magnets are alternately arranged on the rotor core along the circumferential direction, each permanent magnet group comprises at least one first permanent magnet structure and at least one second permanent magnet structure which are arranged at intervals along the radial direction, the first permanent magnet structure comprises three first permanent magnets, and the second permanent magnet structure comprises three second permanent magnets; the coercive force of the first permanent magnet is smaller than the coercive force of the second permanent magnet and smaller than the coercive force of the third permanent magnet. The second permanent magnet plays a role in magnetizing the first permanent magnet, the working point, the magnetization degree and the working point stability of the first permanent magnet can be effectively improved, and the magnetizing current is reduced, and the third permanent magnet further improves the magnetizing effect on the first permanent magnet, so that the magnetic field of the permanent magnet motor is easy to adjust and has a wider speed regulation range and a wider high-efficiency interval. And the cruising ability of the vehicle can be improved.

The invention discloses a joint module and a robot, and relates to the technical field of robotics.The joint module comprises a power output part and a two-stage planetary speed reducing mechanism integrated in the power output part, and the power output part and the two-stage planetary speed reducing mechanism are in axial positioning fit through a built-in limiting structure; wherein the two-stage planetary speed reducing mechanism is provided with an integrated common gear ring, a second-stage sun gear of the two-stage planetary speed reducing mechanism is of a hollow cavity structure, and the hollow cavity structure is configured to be an assembly containing space of the built-in limiting structure. The two-stage planetary speed reduction mechanism is integrally integrated in the internal containing space of the outer rotor type brushless motor, the two-stage planetary speed reduction mechanism and the outer rotor type brushless motor are coaxially and integrally arranged to form a compact integrated structure, the overall size of the joint module is greatly reduced, the design requirement for miniaturization of a robot is met, an external speed reduction component does not need to be additionally arranged, and cost is reduced. And the assembly structure of the robot joint is simplified.

The invention relates to the technical field of motors, and discloses a Halbach array hybrid permanent magnet stator double-zone motor, comprising an inner zone stator, an intermediate rotor and an outer zone stator arranged concentrically. The inner zone stator comprises an inner zone stator core, a NdFeB+AlNiCo hybrid permanent magnet and a pulse magnetization winding wound on the AlNiCo permanent magnet, and the NdFeB and AlNiCo permanent magnets are alternately placed on the outer side of the inner zone stator core along the circumference in a Halbach array. The cylindrical intermediate rotor is alternately placed along the circumference by magnetic conductive blocks and insulating blocks; the outer zone stator comprises an outer zone stator core and an armature winding arranged on the outer zone stator core; the outer zone stator core comprises an outer zone stator yoke and outer zone stator teeth protruding from the inner side of the outer zone stator yoke and uniformly distributed along the circumference, and each outer zone stator tooth is wound with a concentrated armature coil. Compared with the prior art, the present invention can realize low-speed high torque, high-speed wide speed regulation and high efficiency performance of the motor on the basis of realizing magnetization and weak magnetic field regulation of the stator partition motor, and is suitable for the field of electric vehicles.

The utility model relates to the technical field of motors, in particular to a rotor structure for a motor, which comprises a rotor (1), and an air slot structure is arranged on the outer wall of the rotor (1). The air groove structure comprises an air groove (5); the air slots (5) are arranged along the edge of the rotor (1); the surface of the rotor is provided with a plurality of air grooves, and the air grooves can effectively reduce the total area of the surface induction eddy current of the rotor, and can effectively reduce the loss caused by the surface induction eddy current of the rotor. The rotor teeth are arranged between every two adjacent air grooves, and the rotor teeth form airflow during high-speed rotation, so that heat dissipation of the rotor can be facilitated, and the temperature of the rotor can be reduced; the device can effectively ensure the mechanical strength of the motor during high-speed operation while ensuring the electromagnetic performance of the permanent magnet synchronous motor, can suppress rotor eddy current caused by adopting a solid rotor, and can provide certain heat dissipation capability for the rotor.

The invention provides a double-disc-double-ring stator hybrid magnetic flux permanent magnet motor. The double-disc-double-ring stator hybrid magnetic flux permanent magnet motor comprises a double-disc-double-ring stator, H-shaped block iron cores I, II and III, an outer rotor I and II, a middle rotor, an annular winding and a direct cooling water jacket, three types of H-shaped block iron cores I, II and III are arranged by using silicon steel lamination structures in three shapes, and the double-disc-double-ring stator is of an integrated combined structure of the three types of H-shaped block iron cores I, II and III. The double-disc stator I and the double-disc stator II are respectively provided with an inner ring stator I and an outer ring stator I and an outer ring stator II, and the double-disc-double-ring stator support is arranged in the middle of an inner ring between the inner ring stator I and the inner ring stator II. A middle rotor is arranged between the double-disc stator I and the double-disc stator II, and an outer rotor I and an outer rotor II are arranged outside the double-ring stator I and the double-ring stator II. An endless annular winding is adopted, and a direct cooling water jacket is arranged on the periphery of the annular winding. A direct cooling water jacket, a stator bracket and a stator periphery constraint are arranged by using a heat-conducting carbon fiber-resin composite material. By using the structure, the torque density of the motor is improved.

The present invention discloses a low-torque pulsation IPM servo motor, comprising a motor rotor core, wherein the motor rotor core is evenly provided with a plurality of permanent magnet slots along the circumference of the cross section, and permanent magnets are arranged in the permanent magnet slots. At least one pole shoe magnetic adjustment hole is arranged between each pair of adjacent permanent magnet slots of the motor rotor core near the surface of the core. Compared with an IPM servo motor without magnetic adjustment holes, the cogging torque and torque pulsation of the motor can be further reduced, and the torque output performance of the motor can be improved. Compared with an IPM motor with inclined slots or inclined poles, it has higher power density and torque density, higher production efficiency and lower manufacturing cost. An IPM motor with magnetic adjustment holes on the surface of the rotor core has lower wind wear loss, lower manufacturing cost and higher production efficiency.

The invention provides a rotor structure and a motor. The rotor structure comprises a rotor iron core, the rotor iron core is provided with a first magnetic steel groove and at least two second magnetic steel grooves, under one pole, the first magnetic steel groove is perpendicular to the d axis of the rotor structure, the at least two second magnetic steel grooves are arranged on the two sides of the d axis at intervals and are symmetrical about the d axis, the first magnetic steel groove is located between the at least two second magnetic steel grooves, and the second magnetic steel grooves are perpendicular to the d axis. The second magnetic steel groove comprises a first rectangular magnetic steel groove and a second rectangular magnetic steel groove, in the radial direction, the first rectangular magnetic steel groove is located on the outermost side of the second magnetic steel groove in the radial direction, the second rectangular magnetic steel groove is located on the innermost side of the second magnetic steel groove in the radial direction, the tangential thickness of the first rectangular magnetic steel groove is W1, the tangential thickness of the second rectangular magnetic steel groove is W2, and W1 is smaller than W2. According to the rotor structure, the q-axis magnetic circuit of the motor can be increased, the q-axis inductance can be improved, the salient pole ratio of the rotor structure can be improved, the reluctance torque effect can be improved, and the torque output capacity of the motor can be further improved.

A variable flux permanent magnet memory motor disclosed by the present invention comprises a stator, an armature winding, a hybrid permanent magnet rotor and a non-magnetic conductive rotating shaft, the stator comprises iron core teeth and a stator yoke, the iron core teeth are located between the stator yoke and the hybrid permanent magnet rotor, and a rotor iron core of the hybrid permanent magnet rotor is arranged around the outside of the non-magnetic conductive rotating shaft. A first permanent magnet, a second permanent magnet and two third permanent magnets which are magnetized in the tangential direction and two fourth permanent magnets which are magnetized in the radial direction are arranged below each pole of the rotor iron core; the first permanent magnet and the second permanent magnet are connected through an arc-shaped magnetic barrier, the opening sides face the adjacent poles to form an outer series magnetic circuit, and the first permanent magnet and the second permanent magnet close to the air gap side form an inner series magnetic circuit through the air gap and the rotor core and are in series-parallel connection under the magnetism increasing working condition. According to the invention, the air gap flux density of the motor is increased, and the torque output capability of the motor is improved; the intensity and the efficiency of the magnetic field are optimized; the aluminum-nickel-cobalt permanent magnets between the adjacent poles have a magnetism gathering effect, the magnetic circuit structure is simple in form, and the space crowding of the rotor is avoided.

The invention belongs to the field of motors, and discloses a stator composite type double-mechanical-port permanent magnet motor. The double-mechanical-port permanent magnet motor comprises a first armature stator, a first rotor, a composite stator and a second rotor which are coaxially arranged in sequence, and an axial air gap is formed between every two adjacent components. The composite stator comprises an excitation stator and a second armature stator which are distributed in the extending direction from the first armature stator to the second rotor. The current of the armature windings in the first armature stator and the second armature stator is controlled, so that the double-mechanical-port permanent magnet motor operates in a first armature stator independent driving mode, a second armature stator independent driving mode and a first armature stator and second armature stator combined driving mode. The composite stator serves as an excitation unit and an armature unit, so that the utilization rate of the permanent magnets and the power density of the permanent magnet motor are effectively improved. The three motor driving modes can be matched with different speed and load operation conditions, and multi-mode operation of the motor is achieved.

A 12-layer long-span hairpin flat wire motor stator disclosed by the present invention comprises a stator winding and a stator core, the stator core is provided with a stator slot, the stator winding is installed in the stator slot, a winding conductor and the stator core are isolated by insulation paper in the stator slot, the stator winding is formed by combining a plurality of I-PIN hairpins and U-PIN hairpins, and the I-PIN hairpins and the U-PIN hairpins are arranged in the stator slot. And a three-phase outgoing line of the stator winding and the wiring terminal are welded and connected into a whole, and the whole is encapsulated. According to the invention, by adopting the matching of the pole slots with multiple poles and multiple slots, the torque output capability of the motor is improved, the magnetic potential harmonic waves of the winding are reduced, the vibration noise generated during the operation of the motor is reduced, the risk of inter-phase insulation in the stator slots can be effectively reduced, the power density of the motor is improved, and the performance requirement of a vehicle driving motor with a high torque requirement can be met.

The present invention relates to the field of motor design, and discloses a radial magnetic field composite dual-power flow motor, comprising a rotor output shaft, a stationary shaft coaxially connected to the stationary shaft, an inner stator surrounding the stationary shaft, an inner rotor surrounding the inner stator, a magnetic isolation ring surrounding the inner rotor, an outer rotor surrounding the magnetic isolation ring, and an outer stator surrounding the outer rotor; air gaps are provided between the outer stator and the outer rotor and between the inner stator and the inner rotor; the outer rotor is fixedly connected to the inner rotor through the magnetic isolation ring, and the outer rotor, the magnetic isolation ring, the inner rotor and the rotor bracket constitute the motor rotor; the stationary shaft is fixedly connected to the inner stator and the outer shell, and is rotationally connected to the motor rotor and the outer stator; one end of the rotor output shaft is fixedly connected to the motor rotor, and the other end is rotationally connected to the stator bracket. The present invention meets the requirements of low-speed, high-torque and wide speed regulation range operation of the drive motor under the premise of improving the operating reliability of the permanent magnet and avoiding irreversible demagnetization of the permanent magnet due to weak magnetic speed regulation and high temperature.

The present invention relates to the field of motor technology, and discloses a brushless dual-rotor motor structure for a vehicle, which is composed of two motors with radial magnetic circuit structures, including an inner motor component composed of an inner rotor (inner rotor core unit, inner rotor permanent magnet), a modulating rotor, an inner stator (inner stator core unit and inner stator winding); and an outer motor component composed of an outer stator (outer stator winding, outer stator core unit, outer stator permanent magnet) and an outer rotor; the modulating rotor is connected to the input shaft and rotates therewith, the inner and outer rotors are rigidly connected to the output shaft and rotate together with the output shaft, and the inner and outer stators are separated by stator magnetic isolation and fixed on the motor housing. Compared with the prior art, the present invention can be applied to the field of hybrid electric vehicles, can realize the brushless dual-rotor motor, and has reliable operation. Through the control of the inner and outer motors, the power requirements of different working conditions can be met.

The present invention relates to the field of motor design, and discloses a radial magnetic field composite motor, comprising a rotating shaft, a first bearing surrounding the rotating shaft, an inner stator surrounding the first bearing, an inner rotor surrounding the inner stator, a magnetic isolation ring surrounding the inner rotor, an outer rotor surrounding the magnetic isolation ring, and an outer stator surrounding the outer rotor; air gaps are provided between the outer stator and the outer rotor and between the inner stator and the inner rotor; the inner stator is rotatably connected to the rotating shaft through the first bearing, and the outer rotor is fixedly connected to the inner rotor through the magnetic isolation ring; the outer rotor, the magnetic isolation ring and the inner rotor constitute the motor rotor, and are fixedly connected to the rotating shaft through a rotor bracket, and the outer stator is fixed on the housing and rotatably connected to the rotating shaft. The present invention meets the requirements of low-speed, high-torque and wide speed regulation range operation of the driving motor under the premise of improving the operating reliability of the permanent magnet and avoiding irreversible demagnetization of the permanent magnet due to weak magnetic speed regulation and high temperature.

This invention discloses a method for selecting a constrained polytope to expand the actual operable range of a permanent magnet synchronous motor. The method includes: constructing a voltage-constrained polytope with five vertices; scanning the entire speed range, line segment L... i -G slope, to obtain line segment L i -Minimum absolute value of the slope of G; based on line segment L i The minimum absolute value of the slope of -G is used to determine the location of point Wi, and then the location and shape of the voltage-constrained polytope are determined. A system of linear equations for the voltage-constrained polytope is obtained. Based on this system of linear equations, combined with traditional prediction models and value functions, an explicit model predictive controller is constructed. This invention simplifies the explicit model predictive controller, expands the limit boundary of the actual operating range of the motor, increases the speed range and torque output capability of the motor, broadens the external characteristic curve of the motor, and enhances its extreme operating capability.

An asymmetric rotor new energy vehicle motor based on double offset of magnetic axis belongs to the field of new energy vehicle motors. It solves the problem of low motor torque density in existing new energy vehicle motors. The motor described in the present invention is provided with M groups of asymmetric double V-shaped magnetic barrier through holes along the axial direction at equal intervals along the circumference of the rotor core, and each group of asymmetric double V-shaped air magnetic barrier through holes includes two asymmetric V-shaped through holes, and the two asymmetric V-shaped through holes are stacked and arranged along the radial direction of the rotor core, and the opening directions of the two asymmetric V-shaped through holes are both toward the outside of the rotor core; the two strip holes of each asymmetric V-shaped through hole have different lengths, and a permanent magnet is arranged in each strip hole, and the permanent magnet in the shorter strip hole in each asymmetric V-shaped through hole is longer, and the permanent magnet in the longer strip hole is shorter, and each permanent magnet runs through the corresponding strip hole. The present invention is suitable for improving the torque density of the motor.

This utility model provides an assembled rotor structure for converting a three-phase asynchronous motor into a reluctance motor, belonging to the field of motor retrofitting technology. It includes multiple stacked rotor laminations, each with shaft holes, multiple magnet holes, and multiple fixing holes, as well as two fixing washers. The rotor laminations include a head lamination, multiple middle laminations, and a tail lamination. The middle laminations have positioning grooves and positioning flanges, and the fixing holes are arranged around the shaft holes, with the positioning flanges also arranged around the fixing holes. The head laminations have positioning flanges, and the tail laminations have positioning grooves. The fixing washers have through holes, and the two fixing washers are respectively fitted onto the front end face of the head lamination and the rear end face of the tail lamination. This assembled rotor structure for converting a three-phase asynchronous motor into a reluctance motor improves the motor's efficiency and torque output capability, ensuring good and stable motor performance.

The invention discloses an SRM harmonic closed-loop torque ripple suppression method based on current square. The method comprises the following steps: (1) constructing an electromagnetic torque expression containing current square, and solving a current square harmonic model with optimal torque ripple; (2) obtaining a current square model with an optimal current square direct current bias value and an optimal torque ripple; (3) generating a fundamental wave amplitude reference value of the current square model with the optimal torque ripple, and obtaining a current square excitation model in an actual injection motor and an actual current square model of an output motor; (4) in order to realize closed-loop suppression of the torque ripple, the auxiliary channel executes a correction process; and (5) compensating an instantaneous torque peak appearing in a specific electrical angle range, completing harmonic closed-loop torque ripple suppression, and realizing an optimal torque ripple scheme. According to the invention, a double-layer compensation architecture based on current square harmonic injection and torque real-time feedback is constructed, so that the systematic suppression of the torque ripple of the switched reluctance motor is realized.

The application discloses a kind of asymmetric permanent magnet motor of combined magnetic pole Halbach structure, including outer stator and inner rotor, rotor surface is provided with non-uniform Halbach array, each magnetic pole of Halbach array is composed of segmented unequal-width three-part unit block combined arrangement, including the mixed permanent magnet main magnetic pole unit block of radial magnetization and its left and right adjacent ferrite permanent magnet auxiliary magnetic pole unit block, and the tangential magnetization ferrite permanent magnet unit block.Rotor inside alternately distributes two different sizes V type and inverted V type symmetrical air magnetic barrier, wherein one side of V type air magnetic barrier is built-in neodymium iron boron permanent magnet, inverted V type air magnetic barrier is built-in two pieces of neodymium iron boron permanent magnet, which is not symmetrical with magnetic barrier axis and unequal length.The present application, under the premise of certain permanent magnet consumption, makes the maximum current angle of permanent magnet torque and reluctance torque component more approximate by the magnetic pole offset design of permanent magnet, enhances the asymmetric magnetic field offset effect, improves torque component utilization, effectively improves the torque output capacity.