36 results about "Reluctance torque" patented technology

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

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

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

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

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

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

This invention presents a method for improving the torque performance of an electrically excited doubly salient pole motor based on current-coordinated control. By analyzing the influence mechanism of excitation current and armature current on the magnetomotive force, the concept of equivalent current is proposed, and the excitation current and armature current are equivalently converted. Based on this, a current-torque model is established to derive the current distribution ratio that maximizes the output torque, optimizing the allocation of excitation current and armature current. Furthermore, this invention employs an asymmetric current control method, which effectively utilizes reluctance torque for compensation, further improving the average torque and significantly reducing torque ripple. This invention can calculate the optimal current distribution ratio in real time under low-speed and dynamic operating conditions, achieving dynamic adjustment of excitation current and armature current, and significantly improving the torque output capability of the electrically excited doubly salient pole motor. This invention is suitable for applications with stringent requirements for torque output performance, such as aircraft starting systems.

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

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

The invention relates to a motor with a built-in speed change device, and relates to the technical field of motors, the motor comprises a motor body, a shell of the motor body is composed of a hub shell, a front cover and a rear cover, a built-in driver is installed in the motor body, a shaft rod penetrating out of the front cover is arranged in the motor body, a front bearing is arranged in the front cover, a rear bearing is arranged in the rear cover, and the hub shell is connected with the hub shell. The hub comprises a hub shell, a rear bearing and a built-in driver, the built-in driver is mounted in the rear bearing, the bevel gear planetary reducer is arranged in the hub shell, and the bevel gear planetary reducer adopts a first-stage planetary reduction structure to improve the reduction ratio, an IPM built-in magnetic steel rotor structure is adopted, self-developed motor optimization design software is combined, reluctance torque is effectively utilized, and the speed reduction ratio of the hub shell is improved. Meanwhile, a double-layer built-in driver is integrated in the rear bearing, and a first-stage bevel gear planetary speed reduction structure is matched, so that the high speed reduction ratio and large torque output are realized, the size of the assembly is greatly reduced, and the overall weight is effectively reduced.

Embodiments of the application provide a high magnetic resistance torque utilization positive salient pole enhanced hybrid magnetic pole permanent magnet motor, belonging to the field of motor. The high magnetic resistance torque utilization positive salient pole enhanced hybrid magnetic pole permanent magnet motor comprises a stator structure and a hybrid magnetic pole rotor, wherein the hybrid magnetic pole rotor comprises a magnetic flux adjusting rotor magnetic pole unit and an inductance adjusting rotor magnetic pole unit, the magnetic flux adjusting rotor unit can change the permanent magnet air gap magnetic flux, and the inductance adjusting rotor magnetic pole unit can realize adjustment of inductance parameters. Compared with the conventional leakage magnetic controllable motor, the magnetic flux adjusting and inductance adjusting independent rotor magnetic pole unit improves the utilization rate of the permanent magnet, further improves the salient pole characteristics of the motor, and improves the utilization of the magnetic resistance torque; through rotor magnetic pole offset, the output torque is improved and torque pulsation is suppressed.

This disclosure provides a rotor and a motor, belonging to the field of motor technology. The rotor includes a rotor core and multiple permanent magnet assemblies. In a reference plane perpendicular to the rotor axis, multiple first reference lines uniformly divide the rotor core into multiple arc segments, wherein the first reference lines are located between two adjacent permanent magnet assemblies. The permanent magnet assembly includes a first permanent magnet and a second permanent magnet, each of the first and second permanent magnets being embedded in an arc segment. The remanence of the first permanent magnet is lower than that of the second permanent magnet. The first and second permanent magnets form a V-shaped opening facing outwards from the rotor core, and the axis of symmetry of the arc segment passes through the first permanent magnet. This causes the magnetic pole center of the permanent magnet assembly to shift, making the current angle corresponding to the maximum value of the permanent magnet torque of the motor closer to the current angle corresponding to the maximum value of the reluctance torque, thereby improving the output torque of the motor and enhancing the resistance of the first permanent magnet to irreversible demagnetization.

The invention belongs to the technical field of motor equipment, and particularly relates to a reluctance-assisted permanent magnet vernier motor. The magnetic resistance auxiliary type permanent magnet vernier motor comprises a stator structure which comprises a stator iron core with a mounting cavity, an armature winding and a plurality of first permanent magnets, and the first permanent magnets are located in a stator notch and arranged at intervals in the circumferential direction of the stator iron core; the rotor structure comprises a rotor iron core located in the mounting cavity and a rotor shaft connected with the rotor iron core, and a gap is formed between the side surface of the rotor iron core and the inner wall of the mounting cavity; the edge of the rotor core is provided with a plurality of magnetic barrier groups for generating reluctance torque, the plurality of magnetic barrier groups are arranged at intervals along the circumferential direction of the rotor core, the side surface of the rotor core is also provided with a plurality of rotor slots for generating permanent magnet torque based on a magnetic field modulation effect, and the plurality of rotor slots are also arranged at intervals along the circumferential direction of the rotor core. Through effective superposition of the permanent magnet torque and the reluctance torque, the overall torque density and the output torque of the motor are improved.

The present invention discloses a rotor and a permanent magnet synchronous motor having same. In the present invention, each flux barrier structure of the rotor comprises the first arc-shaped flux barrier layer closest to the edge of the rotor, and the second flux barrier layer which is closer than the first arc-shaped flux barrier layer to the center of the rotor. Injection-molded permanent magnets are provided in the first arc-shaped flux barrier layer, and the price of the injection-molded permanent magnets is lower than that of sintered permanent magnets, thereby lowering costs. Although the injection-molded permanent magnets have weaker magnetic performance, the arc-shaped flux barrier layer design helps to fully utilize the reluctance torque of the electric motor, thereby compensating for the drop in magnetic performance to a certain extent. In addition, sintered permanent magnets with stronger magnetic performance are provided in the second flux barrier layer, thereby ensuring that the rotor has sufficient magnetic performance to achieve the desired electric motor performance.

The invention discloses a method for designing a rotor punching sheet of a permanent magnet synchronous motor. The method specifically comprises the following steps: S1, obtaining an eccentric magnetic pole through a set air gap parameter; s2, according to the combination of the air gap parameter in the step S1 and the set permanent magnet characteristic parameter, obtaining a magnetic steel groove; s3, according to the combination of the permanent magnet characteristic parameters in the step S2 and the set technological parameters, obtaining technological hole configuration; s4, according to the combination of the permanent magnet characteristic parameters in the step S2, the magnetic steel grooves in the step S2 and the set weight reduction groove parameters, obtaining weight reduction grooves; and S5, according to the combination of the magnetic steel grooves in the step S2, the permanent magnet characteristic parameters in the step S2 and the set magnetic isolation magnetic bridge structure parameters, the magnetic isolation magnetic bridge structure is obtained.According to the method, by designing the eccentric magnetic poles, the waveform of an air-gap magnetic field is improved, vibration and noise are reduced, and torque fluctuation caused by cogging torque and reluctance torque harmonic waves is restrained.

The application discloses a position sensor zero correction method and system for a salient pole permanent magnet motor, and belongs to the field of motor control. The application considers the characteristics that permanent magnet torque and reluctance torque of the salient pole permanent magnet motor change with current, and implements different correction steps for motors with different salient pole rates, rated currents and magnetic flux sizes, so that the beneficial effects of reducing the interference of load torque on the zero deviation correction process and improving the zero deviation correction precision of the motor can be achieved. The application has higher correction precision on the salient pole permanent magnet synchronous motor with smaller permanent magnet flux, and is convenient to operate. The application can be realized on a general motor frequency converter, and does not need to add new hardware.

The invention discloses a high-torque motor, and the motor comprises a stator which is provided with a plurality of wire ducts which are arranged at intervals in the circumferential direction of the stator and are used for installing wires; the rotor is rotatably arranged on the periphery of the stator, the rotor is provided with a plurality of mounting grooves which are arranged at intervals in the circumferential direction of the rotor and used for mounting the first magnets, each mounting groove comprises two groove bodies which are independent and arranged at intervals, the first end of each groove body is arranged away from the stator, the first ends of the two groove bodies are close to each other, and the second end of each groove body is arranged close to the stator; the second ends of the two groove bodies are far away from each other; and the plurality of second magnets are arranged on the inner circumference of the rotor and are arranged at intervals along the circumferential direction of the rotor. According to the high-torque motor provided by the embodiment of the invention, the first magnet and the second magnet are arranged, so that the flow direction of a magnetic circuit can be adjusted, the reluctance torque can be optimized, the torque of the high-torque motor can be improved, the heating value of the high-torque motor can be reduced, the working efficiency of the high-torque motor can be improved, and the working effect of the high-torque motor can be improved.

The application discloses a rotor and a permanent magnet synchronous motor with the same. In the application, each magnetic barrier structure of the rotor comprises a first arc-shaped magnetic barrier layer closest to the edge of the rotor and a second magnetic barrier layer closer to the center of the rotor than the first arc-shaped magnetic barrier layer, the first arc-shaped magnetic barrier layer is provided with injection molded permanent magnets, the injection molded permanent magnets are lower in price than sintered permanent magnets, thereby reducing the cost, although the magnetic performance of the injection molded permanent magnets is weaker, however, the arc-shaped magnetic barrier layer design helps to make full use of the reluctance torque of the motor, thereby making up for the decline in the magnetic performance to a certain extent, in addition, the second magnetic barrier layer is provided with sintered permanent magnets with stronger magnetic performance, thereby ensuring that the rotor has sufficient magnetic performance to realize the desired motor performance.

The invention discloses a motor rotor and a motor, and relates to the technical field of motors, a rotor body is provided with a plurality of mounting hole groups, each mounting hole group comprises two first mounting holes, and one end of any first mounting hole is close to the other first mounting hole to one end away from the other first mounting hole; the distance between the first mounting hole and the central axis of the rotor body is gradually increased; and the magnetic steel group is arranged in the corresponding mounting hole group and comprises two pieces of first magnetic steel, and the two pieces of first magnetic steel are respectively arranged in the two first mounting holes of the corresponding mounting hole group and are matched with the corresponding first mounting holes. Therefore, the distance between the first mounting hole and the central axis of the rotor body is gradually increased from one end, close to the other first mounting hole, of any first mounting hole to one end, away from the other first mounting hole, of any first mounting hole, and the first magnetic steel is arranged in the corresponding first mounting hole, so that the arrangement position of the first magnetic steel can be optimized; therefore, the reluctance torque of the motor rotor is improved, and the performance of the motor rotor is improved.

This invention discloses a single-phase permanent magnet reluctance brushless motor, belonging to the field of motor technology. The motor uses DC power supply, solving problems such as lack of static self-locking, complex electrical control, and outdated braking modes in traditional series-wound, brushless, and permanent magnet synchronous motors. The motor consists of a stator assembly, winding assembly, rotor assembly, and drive control assembly. The stator assembly adopts a radially expandable open magnetic circuit structure. The winding assembly is a single-phase system with two excitation coils connected in parallel, allowing flexible adjustment of the number of turns and wire diameter, reducing copper losses, and improving efficiency and heat dissipation. The rotor assembly is a three-N-pole and three-S-pole magnetic tiles coaxially and in the same direction to form a composite magnetic pole structure. The salient poles of the magnetic poles cooperate with the salient poles of the stator pole shoes to form a magnetic circuit synthesis, enabling the permanent magnet torque and reluctance torque to be superimposed in the same direction, achieving static locking. The motor has a large starting torque, good high and low speed torque performance, and a wide voltage adaptation range, achieving reluctance braking and synchronous power generation based on reluctance characteristics.

The application provides a rotor structure and a motor. The rotor structure comprises: a rotor core (1) provided with a magnetic steel slot (11); a first permanent magnet (2) installed in the magnetic steel slot (11), wherein the first permanent magnet (2) is radially magnetized; and a second permanent magnet (3) arranged at an axial end of the rotor core (1), wherein the second permanent magnet (3) is axially magnetized, and the second permanent magnet (3) comprises a plurality of polarity regions, and an included angle a between a geometric center line of one of the polarity regions and a d-axis of a polarity region adjacent to the one of the polarity regions and radially outside the one of the polarity regions and having the same polarity satisfies a >= 360° / 4p, and p is a pole pair number of the motor. According to the rotor structure, the inductance difference and the reluctance torque of the motor can be improved.

The invention relates to a motor with combined rotor magnetic poles, which comprises a rotating shaft, a stator and a rotor positioned on the outer side of the rotating shaft, and is characterized in that the rotor comprises a rotor bracket, a plurality of dovetail grooves distributed along the circumferential direction of the edge of the rotor bracket, and a plurality of rotor magnetic poles inserted into the dovetail grooves; each rotor magnetic pole comprises a permanent magnet groove, a first permanent magnet installed in the permanent magnet groove and second permanent magnets symmetrically distributed on the two sides of the first permanent magnet in parallel, and the proportions of the first permanent magnet and the second permanent magnet in every two adjacent permanent magnet grooves are different. Through different proportions of neodymium iron boron permanent magnets and ferrite permanent magnets in two adjacent permanent magnet grooves, symmetry of permanent magnet flux bias is changed, a current angle difference value corresponding to a peak value of a permanent magnet torque and a peak value of a reluctance torque is reduced, the two kinds of torques can play a role synergistically, the torque density of the motor is greatly improved, and the service life of the motor is prolonged. The problem that electromagnetic torque of a traditional motor is not fully utilized is solved.

The invention provides a rotor core structure and a motor comprising the same, relates to the technical field of motors, and solves the technical problems of poor running stability, low efficiency and high noise of the motor. The rotor iron core structure comprises a plurality of punching sheets which are laminated along the axial direction, each punching sheet is provided with a magnetic isolation groove which is distributed along the circumferential direction, the magnetic isolation grooves are distributed on the plurality of punching sheets which are laminated along the axial direction in an angular staggered manner, and the magnetic isolation grooves between adjacent punching sheets rotate and deviate at a fixed angle to form a spiral layout. According to the invention, the magnetic flux path distribution can be optimized, the local magnetic flux density is reduced, the magnetic saturation is reduced, and the reluctance torque is improved; and meanwhile, the periodic fluctuation of the cogging torque is effectively weakened, the vibration and noise during the operation of the motor are reduced, and the efficiency and the operation stability of the motor are improved.

The invention provides a motor rotor, a permanent magnet auxiliary synchronous reluctance motor and an air conditioner, the motor rotor comprises a rotor core, k1 magnetic barrier poles composed of air slots and k2 permanent magnet poles composed of permanent magnets are formed on the rotor core, and the magnetic barrier poles are adjacently arranged at intervals along the circumferential direction of the rotor core, the permanent magnet poles are adjacently arranged at intervals along the circumferential direction of the rotor core, the number of pole pairs of the motor rotor is p, k1 + k2 = 2p, k1 is greater than or equal to 2, and k2 is greater than or equal to 2. According to the invention, the positions of the magnetic barrier poles and the permanent magnet poles can be adjusted, the peak value superposition of the reluctance torque and the permanent magnet torque can be realized for the electrical angles where the peak value points of the reluctance torque and the permanent magnet torque are located, and the torque density of the motor is improved, so that the torque output capability of the motor is improved.

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.

This application provides a controller, a power system, and a vehicle for controlling a motor as a switching circuit. The motor includes a stator, a rotor, and an excitation module. During the process of the motor acting as a switching circuit, the current in the stator windings generates excitation torque. The controller controls the excitation module to input a target excitation current to the rotor based on the direct-axis current, causing the motor to generate reluctance torque to cancel or partially cancel the excitation torque, thereby reducing or avoiding vehicle vibration.

The invention provides a rotor assembly and a motor, the rotor assembly is used for the motor, and the rotor assembly is arranged in a stator assembly. The rotor assembly comprises a rotor iron core, the outer edge of the rotor iron core is provided with a plurality of rotor tooth parts and a plurality of first rotor connecting parts which are alternately arranged at intervals in the circumferential direction of the rotor iron core, and a containing groove is formed between the adjacent rotor tooth part and first rotor connecting part; the magnetic steel is arranged in the accommodating groove; the magnetizing directions of the two pieces of magnetic steel located on the two sides of the same first rotor connecting part are the same, and the magnetizing directions are tangential. The two magnetic steels and the first rotor connecting part located between the two magnetic steels are arranged between the adjacent rotor tooth parts, and the magnetic resistance of the rotor core is smaller than the magnetic resistance of the magnetic steels, so that the quadrature-axis magnetic resistance of the rotor assembly is reduced, the quadrature-axis inductance of the rotor assembly is improved, the salient pole rate of the rotor assembly is improved, and the magnetic resistance torque of the motor is improved. In this way, the torque density and efficiency of the motor can be improved.

The invention provides a rotor structure and a permanent magnet auxiliary synchronous reluctance motor. The rotor structure comprises a rotor iron core, the rotor iron core comprises a rotor outer circle and a shaft hole, the rotor iron core is provided with a plurality of magnetic barrier groove sets, and each magnetic barrier groove set comprises a first magnetic barrier groove, a second magnetic barrier groove and a third magnetic barrier groove which are sequentially arranged in the direction from the rotor outer circle to the shaft hole. The second magnetic barrier grooves and the third magnetic barrier grooves form groove structures with openings facing the outer circle of the rotor, the first magnetic barrier grooves are located in the groove structures of the second magnetic barrier grooves, the second magnetic barrier grooves are located in the groove structures of the third magnetic barrier grooves, the first magnetic barrier grooves form an asymmetric structure with respect to the d-axis, and the third magnetic barrier grooves form an asymmetric structure with respect to the d-axis. The first magnetic barrier groove, the second magnetic barrier groove and the third magnetic barrier groove are provided with permanent magnets on the two sides of the d axis. According to the rotor structure, the phase difference between the reluctance torque peak value and the permanent magnet torque peak value can be reduced, the torque utilization rate is improved, and the output torque and the overall performance of the motor are improved.

The high-torque-density magnetic coupling comprises an inner rotor and an outer rotor, a plurality of magnetic steel grooves are formed in rotor iron cores of the inner rotor and the outer rotor, permanent magnets of linear structures are embedded in the magnetic steel grooves, the permanent magnets are evenly arranged in the circumferential direction, and N poles and S poles are alternately arranged; the plurality of permanent magnets are distributed on the whole circumference of the rotor iron core in the form of even pairs of magnetic poles, and the rotor iron core is provided with magnetic isolation bridges at the two sides of the magnetic steel grooves for smoothing the air gap flux density, increasing the reluctance torque and weakening the torque pulsation.

The application provides a rotor structure and a motor. The rotor structure comprises a rotor core, and a plurality of layers of magnetic barriers are arranged on the rotor core. Under one pole, the magnetic barriers comprise a first magnetic barrier, a second magnetic barrier, a third magnetic barrier and a fourth magnetic barrier which are sequentially and spaced apart along a q-axis direction from outside to inside. The first magnetic barrier, the second magnetic barrier, the third magnetic barrier and the fourth magnetic barrier are all symmetrical about the q-axis. The first magnetic barrier has a first magnetic bridge between two ends and an outer circle of the rotor core. The second magnetic barrier comprises at least two first segments, and a second magnetic bridge is formed between adjacent first segments. The third magnetic barrier comprises at least two first segments, and a third magnetic bridge is formed between adjacent first segments. The fourth magnetic barrier comprises at least two second segments, and a fourth magnetic bridge is formed between adjacent second segments. According to the rotor structure, the salient pole difference of the motor can be increased, the reluctance torque of the motor can be significantly improved, the air gap flux density waveform can be optimized, the torque ripple can be reduced, and the stability and efficiency of the motor operation can be enhanced.