CN218387000U

CN218387000U - Motor rotor with magnetic barrier, motor and compressor

Info

Publication number: CN218387000U
Application number: CN202222722778.6U
Authority: CN
Inventors: 李宏涛; 朱晓光; 邱小华
Original assignee: Guangdong Meizhi Compressor Co Ltd
Current assignee: Guangdong Meizhi Compressor Co Ltd
Priority date: 2022-10-14
Filing date: 2022-10-14
Publication date: 2023-01-24
Anticipated expiration: 2032-10-14

Abstract

The utility model discloses a motor rotor, motor and compressor with magnetic barrier, wherein, the motor rotor with magnetic barrier includes rotor core, a plurality of curved grooves and a plurality of magnetic barrier groups; the plurality of curved slots are arranged on the rotor core and are distributed at intervals along the circumferential direction of the rotor core, and two ends of each curved slot extend towards the edge of the rotor core; the magnetic barrier groups are arranged on one sides of the curved slots far away from the circle center of the rotor core, and each magnetic barrier group comprises at least one layer of magnetic barrier holes which are distributed at intervals along the extending direction of the slot wall of the curved slot; and an included angle formed by connecting lines between two ends of the magnetic barrier holes and the circle center of the rotor core is a, and a is more than or equal to (1/8) × (2 pi/p), wherein p is the number of poles of the motor where the motor rotor with the magnetic barrier is located. The utility model discloses an electric motor rotor with magnetic barrier can improve motor efficiency through improving reluctance torque to reduce rare earth permanent magnet's quantity.

Description

Motor rotor with magnetic barrier, motor and compressor

Technical Field

The utility model relates to the technical field of electric machines, in particular to electric motor rotor, motor and compressor with magnetic barrier.

Background

A permanent magnet synchronous motor (IPM) is a motor in which a layer of permanent magnets is placed inside a rotor, and which mainly uses permanent magnet torque and reluctance torque as an auxiliary.

The synthetic formula of the reluctance torque and the permanent magnet torque is as follows:

t = mp (Lq-Ld) id iq + mp ψ PM iq. Wherein,

t is the output torque of the motor, the value of T is increased, and the performance of the motor can be improved; the first term in the equation after T is reluctance torque, and the second term is permanent magnet torque; psi PM is the maximum value of the stator and rotor coupling magnetic flux generated by the permanent magnet of the motor, m is the phase number of the stator conductor, ld and Lq are respectively a d-axis inductor and a q-axis inductor, wherein the d axis refers to an axis coincident with the axis of the main magnetic pole, the q axis refers to an axis perpendicular to the axis of the main magnetic pole, and the perpendicular refers to an electrical angle; id. iq is the component of the armature current in the d-axis and q-axis directions, respectively.

In the prior art, the performance of a motor is improved mainly by improving the performance of a permanent magnet, namely, the value of output torque is improved by improving the permanent magnet torque, so that the efficiency of the motor is improved, and a common method is to embed a rare earth permanent magnet. However, since rare earth is a non-renewable resource and is expensive, the wider application of this type of motor is limited. In addition, the urgent requirement for further improving the efficiency of the motor cannot be met only by improving the performance of the permanent magnet to improve the performance of the motor. In addition, the current motor mostly adopts a structure with two or more layers of permanent magnets, so that the motor is high in cost and weak in demagnetization resistance, and meanwhile, the production beat of the motor is influenced by adopting a multi-layer permanent magnet structure, and the performance of a motor rotor is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an electric motor rotor with magnetic barrier aims at improving motor efficiency through improving reluctance torque to reduce rare earth permanent magnet's quantity.

In order to achieve the above object, the utility model provides an electric motor rotor with magnetic barrier, electric motor rotor with magnetic barrier includes:

a rotor core;

the curved slots are arranged on the rotor core and are distributed at intervals along the circumferential direction of the rotor core, and two ends of each curved slot extend towards the edge of the rotor core; and

the magnetic barrier groups are arranged on one sides of the curved grooves far away from the circle center of the rotor core, each magnetic barrier group comprises at least one layer of magnetic barrier holes which are arranged at intervals along the d-axis direction of the motor rotor with the magnetic barriers, the number of the magnetic barrier holes in one layer is multiple, and the magnetic barrier holes are arranged at intervals along the extending direction of the groove walls of the curved grooves; and an included angle formed by connecting lines between two ends of the magnetic barrier holes of one layer and the circle center of the rotor core is a, and a is more than or equal to (1/8) × (2 pi/p), wherein p is the number of poles of the motor where the motor rotor with the magnetic barrier is located.

In an embodiment, the curved slot has a first sidewall and a second sidewall that are disposed opposite to each other, and the first sidewall and the second sidewall are both protruded toward a center of the rotor core.

In one embodiment, a straight-axis magnetic conduction channel is formed between any two adjacent magnetic barrier holes in one layer of magnetic barrier holes.

In one embodiment, the rotor of the electric machine with the magnetic barrier further comprises a plurality of permanent magnets, and the plurality of permanent magnets are mounted in the plurality of curved slots.

In an embodiment, the thickness of the permanent magnet in the d-axis direction of the motor rotor with the magnetic barrier is T, the magnetic barrier hole has a first side and a second side which are oppositely arranged, the second side is located on one side of the first side far away from the center of the rotor core, the distance from the first side to the second side is the thickness H of the magnetic barrier hole, and T > H is satisfied.

In one embodiment, in a cross section perpendicular to the axial direction of the motor rotor with the magnetic barrier, the thickness of the middle part of the permanent magnet is larger than the thickness of the two ends of the permanent magnet.

In one embodiment, a gap is formed between two ends of the permanent magnet and two ends of the curved slot embedded in the permanent magnet, and the gap is used for filling a non-magnetic-conductive medium.

In one embodiment, the curved groove is arranged in a U shape.

In one embodiment, the curved groove is arranged in a V shape.

In one embodiment, the curved groove is arranged in an arc shape.

The utility model discloses still provide a motor, the motor includes the electric motor rotor who has the magnetic barrier to and the cover is established the stator in the electric motor rotor outside that has the magnetic barrier, the stator includes stator core and the winding of winding on the stator tooth. The motor rotor with the magnetic barriers comprises a rotor core, a plurality of curved slots and a plurality of magnetic barrier groups; the plurality of curved slots are arranged on the rotor core and are distributed at intervals along the circumferential direction of the rotor core, and two ends of each curved slot extend towards the edge of the rotor core; the magnetic barrier groups are arranged on one side, away from the center of the rotor core, of the curved slots, each magnetic barrier group comprises at least one layer of magnetic barrier holes which are arranged at intervals along the direction of the d axis of the motor rotor with the magnetic barriers, the number of the magnetic barrier holes in one layer is multiple, and the magnetic barrier holes are arranged at intervals along the extending direction of the slot walls of the curved slots; and an included angle formed by connecting lines between two ends of the magnetic barrier holes and the circle center of the rotor core is a, and a is more than or equal to (1/8) × (2 pi/p), wherein p is the number of poles of the motor where the motor rotor with the magnetic barrier is located.

Optionally, the thickness of the motor rotor having the magnetic barrier in the axial direction thereof is not smaller than the thickness of the stator in the axial direction thereof.

The utility model discloses still provide a compressor, the compressor includes the motor, the motor includes the electric motor rotor who has the magnetic barrier to and the cover is established the stator in the electric motor rotor outside that has the magnetic barrier, the stator includes stator core and the winding of winding on the stator tooth. The motor rotor with the magnetic barriers comprises a rotor core, a plurality of curved slots and a plurality of magnetic barrier groups; the plurality of curved slots are arranged on the rotor core and are distributed at intervals along the circumferential direction of the rotor core, and two ends of each curved slot extend towards the edge of the rotor core; the magnetic barrier groups are arranged on one side, away from the center of the rotor core, of the curved slots, each magnetic barrier group comprises at least one layer of magnetic barrier holes which are arranged at intervals along the direction of the d axis of the motor rotor with the magnetic barriers, the number of the magnetic barrier holes in one layer is multiple, and the magnetic barrier holes are arranged at intervals along the extending direction of the slot walls of the curved slots; and an included angle formed by connecting lines between two ends of the magnetic barrier holes of one layer and the circle center of the rotor core is a, and a is more than or equal to (1/8) × (2 pi/p), wherein p is the number of poles of the motor where the motor rotor with the magnetic barrier is located.

The utility model discloses a motor rotor with magnetic barriers, which comprises a rotor core, a plurality of curved slots and a plurality of magnetic barrier groups; the plurality of curved slots are arranged on the rotor core and are distributed at intervals along the circumferential direction of the rotor core, and two ends of each curved slot extend towards the edge of the rotor core; the magnetic barrier groups are arranged on one side, away from the center of the rotor core, of the curved slots, each magnetic barrier group comprises at least one layer of magnetic barrier holes which are arranged at intervals along the direction of the d axis of the motor rotor with the magnetic barriers, the number of the magnetic barrier holes in one layer is multiple, and the magnetic barrier holes are arranged at intervals along the extending direction of the slot walls of the curved slots; and an included angle formed by connecting lines between two ends of the magnetic barrier holes of one layer and the circle center of the rotor core is a, and a is more than or equal to (1/8) × (2 pi/p), wherein p is the number of poles of the motor where the motor rotor with the magnetic barrier is located. When the included angle a satisfies a condition that a is not less than (1/8) x (2 pi/p), the q-axis inductance of the motor rotor can be obviously improved, the inductance difference between the d axis and the q axis of the motor can be increased, the reluctance torque of the motor can be improved, the unit current can generate larger electromagnetic torque, and the efficiency of the motor can be improved. The utility model provides a curved groove mainly is used for placing the permanent magnet, just curved groove sets up to individual layer structure, can increase the thickness of placing the permanent magnet in curved groove to improve the anti demagnetization ability of permanent magnet, guarantee the reliability of motor. Meanwhile, the using amount of the permanent magnet placed in the curved groove of the single-layer structure can be reduced compared with that of the permanent magnet of the double-layer structure, and therefore the production cost of the motor rotor can be reduced. Simultaneously, the electric motor rotor of the bent groove structure of individual layer compares in the electric motor rotor of the bent groove structure of double-deck, and the production efficiency of the electric motor rotor of the bent groove structure of individual layer is also higher.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of a motor rotor with a magnetic barrier according to the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

fig. 3 is a schematic structural diagram of another embodiment of the rotor of the electric machine with the magnetic barrier according to the present invention;

fig. 4 is a schematic diagram of the relationship between the output torque and the range change of the included angle a of the motor of the present invention.

The reference numbers illustrate:

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides an electric motor rotor's embodiment with magnetic barrier, permanent magnetism auxiliary synchronization reluctance machine's electric motor rotor promptly mainly uses in air condition compressor, electric motor car and fan system. The synchronous reluctance motor is provided with a plurality of layers of rotor magnetic barriers and works by means of reluctance torque generated by asymmetry of a rotor magnetic circuit. The motor has the advantages of low cost, simple manufacture and small rotor loss, but has the disadvantages of low power factor and torque density and large torque ripple. In order to improve the torque and the power factor of the motor, certain low-performance permanent magnets (ferrite or bonded neodymium iron boron) can be inserted into the rotor magnetic barriers for auxiliary excitation, so that the excitation component of the motor current can be reduced and permanent magnet torque can be generated, namely the permanent magnet auxiliary synchronous reluctance motor.

When designing the permanent magnet in the magnetic barrier, the influence of the permanent magnet flux on the saturation degree of the magnetic circuit needs to be considered. Magnetic circuit saturation is easily caused by overlarge permanent magnetic flux, and the salient pole rate of the rotor is reduced; and if the magnetic flux of the permanent magnet is too small, the improvement of the torque and the power factor is small. Although the low-performance permanent magnet has lower coercive force, the demagnetization curve linearity is better.

t = mp (Lq-Ld) id iq + mp ψ PM iq. Wherein,

t is the output torque of the motor, the value of T is increased, and the performance of the motor can be improved; the first term in the equation after T is reluctance torque, and the second term is permanent magnet torque; psi PM is the maximum value of the stator and rotor coupling magnetic flux generated by the permanent magnet of the motor, m is the phase number of the stator conductor, ld and Lq are respectively a d-axis inductor and a q-axis inductor, wherein the d axis refers to an axis coincident with the axis of the main magnetic pole, the q axis refers to an axis perpendicular to the axis of the main magnetic pole, and the perpendicular refers to an electrical angle; id. iq is the component of the armature current in the d-axis and q-axis directions, respectively. According to the formula, increasing the inductance difference value of Ld and Lq and psi pm can improve the output torque, that is, under the condition of ensuring that one of the reluctance torque and the permanent magnet torque is kept unchanged, the other one of the reluctance torque and the permanent magnet torque can improve the total output torque of the motor, so that the efficiency of the motor is improved.

In the prior art, the performance of a motor is improved mainly by improving the performance of a permanent magnet, namely, the value of output torque is improved by improving the permanent magnet torque, so that the efficiency of the motor is improved, and a common method is to embed a rare earth permanent magnet. However, since rare earth is a non-renewable resource and is expensive, wider application of the motor is limited. In addition, the urgent requirement for further improving the efficiency of the motor cannot be met only by improving the performance of the permanent magnet to improve the performance of the motor. In addition, the current motor mostly adopts a structure with two or more layers of permanent magnets, so that the motor is high in cost and weak in demagnetization resistance, and meanwhile, the production beat of the motor is influenced by adopting a multi-layer permanent magnet structure, and the performance of a motor rotor is influenced.

Referring to fig. 1 to 3, in an embodiment of the present invention, the motor rotor 10 with magnetic barriers includes a rotor core 100, a plurality of curved slots 200, and a plurality of magnetic barrier groups 300; the plurality of curved slots 200 are disposed in the rotor core 100 and are arranged at intervals along the circumferential direction of the rotor core 100, and both ends of the curved slots 200 extend toward the edge of the rotor core 100; the plurality of magnetic barrier groups 300 are arranged on one side of the curved slots 200 far away from the center of the rotor core 100, the magnetic barrier groups 300 include at least one layer of magnetic barrier holes 310 arranged at intervals along the axis direction of the motor rotor 10d with magnetic barriers, the number of the magnetic barrier holes 310 in one layer is multiple, and the magnetic barrier holes 310 are arranged at intervals along the extending direction of the slot walls of the curved slots 200; an included angle formed by a connecting line between two ends of the magnetic barrier hole 310 of one layer and the center of the rotor core 100 is a, and a is greater than or equal to (1/8) × (2 pi/p), wherein p is the number of poles of the motor where the motor rotor 10 with the magnetic barrier is located.

Specifically, the motor rotor includes a rotor core 100 and a permanent magnet 500, and the rotor core 100 is formed by laminating silicon steel plates and has a certain lamination height. The rotor core 100 is driven by the magnetic action of the permanent magnet 500, and the motor rotor can rotate relative to the motor stator, so as to realize the normal operation of the motor. The rotor core 100 is formed by laminating high-permeability magnetic materials or silicon steel stamped sheets, is formed by laminating the high-permeability magnetic materials or the silicon steel stamped sheets, has high magnetic flux rate, and is high in structural strength and convenient to process.

The plurality of curved slots 200 are opened on the rotor core 100, the curved slots 200 are disposed in a curved shape, and the curved slots 200 may have one curved portion or a plurality of curved portions, but not limited thereto, and when the curved slots 200 have a plurality of curved portions, the curved slots 200 are disposed in a substantially wavy shape. The curved slots 200 are arranged at intervals along the circumferential direction of the rotor core 100, and are specifically uniformly distributed along the circumferential direction of the rotor core 100 with the center of the rotor core 100 as the center of circle, the two ends of the curved slots 200 extend towards the edge of the rotor core 100, and form an area for the multiple magnetic barrier groups 300 to be arranged between the two ends of the curved slots 200 and the edge of the rotor core 100, and the multiple magnetic barrier groups 300 are arranged on one side of the curved slots 200 away from the center of circle of the rotor core 100. It should be noted that the curved slots 200 are mainly used for installing the permanent magnets 500, and the permanent magnets 500 have magnetic poles, so the number of the curved slots 200 is set to be even, as shown in fig. 1, 6 curved slots 200 are arranged at intervals along the circumferential direction of the rotor core 100, at least one permanent magnet 500 is placed in each curved slot 200, the polarities of the permanent magnets 500 in any two adjacent curved slots 200 are opposite, and the permanent magnets 500 are alternately distributed along the circumferential direction of the rotor core 100 according to the N pole and the S pole. In this embodiment, the plurality of curved slots 200 are arranged in a single-layer structure, and compared with a motor rotor in a double-layer structure in the prior art, the thickness of the permanent magnet 500 can be increased in a limited volume by placing the permanent magnet 500 in the curved slot 200 in the single-layer structure, so that the demagnetization resistance of the permanent magnet 500 is improved, and the reliability of the motor is improved; meanwhile, the production efficiency of the motor rotor with the single-layer curved groove 200 structure is higher; meanwhile, the amount of the permanent magnets 500 required to be placed in the single-layer curved slot 200 is relatively reduced, and the overall amount of the permanent magnets 500 is reduced, so that the production cost of the rotor can be further reduced, and the production cost of the motor is reduced.

The magnetic barrier group 300 comprises at least one layer of magnetic barrier holes 310 arranged at intervals along the extending direction of the groove wall of the curved groove 200, the number of the magnetic barrier holes 310 in one layer is set to be multiple, and the magnetic barrier holes 310 can be filled with air or other non-magnetic conducting materials. The slot wall of the curved slot 200 may be a first sidewall 210 near the edge of the rotor core 100, or may be a second sidewall 220 near the center of the rotor core 100. The extending directions of the first sidewall 210 and the second sidewall 220 may be the same or different, and in this embodiment, the extending directions of the first sidewall 210 and the second sidewall 220 are substantially the same, so that the plurality of magnetic barrier holes 310 are arranged at intervals along the extending direction of the first sidewall 210 of the curved slot 200 or arranged at intervals along the extending direction of the second sidewall 220 of the curved slot 200. A direct-axis magnetic conduction channel 400 is formed between every two adjacent magnetic barrier holes 310, the magnetic resistance of the direct-axis magnetic conduction channel 400 in the d-axis direction is small, high magnetic flux is achieved, and the inductance Ld is large; and the q-axis direction at the central line of the magnetic barrier hole 310 has high magnetic resistance, the inductance Lq is small, and the inductance difference between the d-axis direction and the q-axis direction can be increased, so that the torque output capacity of the motor is improved. On the other hand, the magnetic barrier hole 310 is arranged between the first side wall 210 of the curved slot 200 and the edge of the rotor core 100, so that on the basis of reducing the influence on the permanent magnetic force, the magnetic force line path can be standardized, the magnetic field harmonic wave in the air gap can be weakened, the magnetic saturation degree can be relieved, a magnetic barrier is formed in the rotating process of the motor rotor, the power density and the torque density of the motor are improved, the overload capacity of the motor is improved, the torque pulsation of the motor is effectively improved, the using amount of the permanent magnet 500 of the motor is reduced, that is, on the basis of reducing the production cost, the performance of the motor is greatly improved, and the product competitiveness is improved.

Referring to fig. 1 and 4, an included angle a formed by a connecting line between two ends of the magnetic barrier hole 310 of one layer and the center of the rotor core 100 is a, and when the included angle a satisfies a ≧ (1/8) × (2 pi/p) (p is the number of poles of the motor where the motor rotor 10 with the magnetic barrier is located), q-axis inductance of the motor rotor can be significantly improved, so that the inductance difference between the d-axis and the q-axis of the motor is increased, which is more beneficial to improving reluctance torque of the motor, and larger electromagnetic torque is generated per unit current, thereby improving efficiency of the motor.

The utility model discloses a motor rotor 10 with magnetic barrier, including rotor core 100, a plurality of curved slots 200 and a plurality of magnetic barrier group 300; the plurality of curved slots 200 are disposed in the rotor core 100 and are arranged at intervals along the circumferential direction of the rotor core 100, and both ends of the curved slots 200 extend toward the edge of the rotor core 100; the plurality of magnetic barrier groups 300 are arranged on one side of the curved slots 200 far away from the center of the rotor core 100, each magnetic barrier group 300 comprises at least one layer of magnetic barrier holes 310 arranged at intervals along the d-axis direction of the motor rotor 10 with magnetic barriers, the number of the magnetic barrier holes 310 in one layer is multiple, and the magnetic barrier holes 310 are arranged at intervals along the circumferential direction of the rotor core 100; an included angle formed by a connecting line between two ends of the magnetic barrier hole 310 of one layer and the center of the rotor core 100 is a, and a is greater than or equal to (1/8) × (2 pi/p), wherein p is the number of poles of the motor where the motor rotor 10 with the magnetic barrier is located. When the included angle a satisfies a condition that a is not less than (1/8) x (2 pi/p), the q-axis inductance of the motor rotor can be obviously improved, the inductance difference between the d axis and the q axis of the motor can be increased, the reluctance torque of the motor can be improved, the unit current can generate larger electromagnetic torque, and the efficiency of the motor can be improved. The utility model provides a curved groove 200 mainly is used for placing permanent magnet 500, just curved groove 200 sets up to single-layer structure, can increase the thickness of placing the permanent magnet 500 in curved groove 200 to improve permanent magnet 500's anti demagnetization ability, guarantee the reliability of motor. Meanwhile, the amount of the permanent magnet 500 placed in the curved groove 200 having the single-layer structure is reduced compared with the amount of the permanent magnet 500 having the double-layer structure, so that the production cost of the motor rotor can be reduced. Simultaneously, the electric motor rotor of the bent groove 200 structure of individual layer compares in the electric motor rotor of the bent groove 200 structure of double-deck, and the production efficiency of the electric motor rotor of the bent groove 200 structure of individual layer is also higher.

Referring to fig. 1, on the basis of the above embodiment, the curved slot 200 has a first sidewall 210 and a second sidewall 220 that are oppositely disposed, and both the first sidewall 210 and the second sidewall 220 are protruded toward the center of the rotor core 100. Specifically, the curved slot 200 has a first sidewall 210 and a second sidewall 220 that are disposed opposite to each other, the first sidewall 210 is disposed near the center of the rotor core 100, the second sidewall 220 is disposed away from the center of the rotor core 100, since the magnetic barrier group 300 includes at least one layer of magnetic barrier holes 310 that are arranged at intervals along the circumferential direction of the rotor core 100, the number of the layer of magnetic barrier holes 310 is set to be plural, the plural magnetic barrier holes 310 need to be disposed at a certain spatial position, and the second sidewall 220 is disposed toward the edge of the rotor core 100, such that a sheet region is formed between the second sidewall 220 and the edge of the rotor core 100, and the plural magnetic barrier groups 300 are disposed on one side of the plural curved slots 200 that is away from the center of the rotor core 100, that is, in the sheet region formed between the second sidewall 220 and the edge of the rotor core 100.

Referring to fig. 1 to 3, further, a straight-axis magnetic conduction channel 400 is formed between any two adjacent magnetic barrier holes 310 in one layer of the magnetic barrier holes 310. Specifically, the d-axis direction magnetic resistance of the straight-axis magnetic conduction channel 400 is small, the magnetic flux is high, and the inductance Ld is large; the q-axis direction at the center line of the magnetic barrier hole 310 has a high magnetic resistance, and the inductance Lq is small, so that the inductance difference between the d-axis direction and the q-axis direction can be increased, that is, the value in the formula T = mp (Lq-Ld) · id iq + mp ψ PM · iq (Lq-Ld) is increased, thereby improving the torque output capability of the motor. The surface of the magnetic conduction channel can be coated with magnetic conduction materials, so that a better magnetic conduction effect is achieved.

Referring to fig. 1 to 3, in an embodiment, the motor rotor 10 with a magnetic barrier further includes a plurality of permanent magnets 500, and the plurality of permanent magnets 500 are installed in the plurality of curved slots 200. Specifically, in order to ensure the performance of the rotor 10 of the motor having a magnetic barrier, the number of the permanent magnets 500 is set to be not less than the number of the curved slots 200, and at least one permanent magnet 500 should be placed in each curved slot 200. The shape of the permanent magnet 500 is matched with that of the curved slot 200, and at least two opposite side edges of the permanent magnet 500 are abutted against the inner wall surface of the curved slot 200, so that the stability of the permanent magnet 500 after being installed in the curved slot 200 is ensured. In terms of selecting the material of the permanent magnet 500, in order to increase the permanent magnet torque of the motor as much as possible, it is generally desirable to select the permanent magnet 500 with relatively high performance, and the usage amount of the permanent magnet 500 fills the curved groove 200 as much as possible, but in terms of utilization of reluctance torque, the higher the residual flux density of the permanent magnet 500 is, the better the residual flux density is, and as the residual flux density of the permanent magnet 500 is increased, the motor rotor is also saturated, which leads to the decrease of inductance. Wherein, rotor magnetic circuit saturation has a bigger influence on q-axis inductance. In addition, it has been found through research that a proper amount of residual magnetic flux density of the permanent magnet 500 can cause a certain saturation of the gap portion between the two ends of the permanent magnet 500 and the two ends of the curved slot 200, which is very advantageous for reducing the d-axis inductance. Because the main output torque of the motor is reluctance torque, particularly when the motor enters a high-speed weak magnetic region, the proportion of the reluctance torque in the whole electromagnetic torque is further increased, and therefore, the influence of the performance of a proper permanent magnet 500 material on the difference value of the d-axis inductance and the q-axis inductance is very necessary.

Referring to fig. 1, in an embodiment, a thickness of the permanent magnet 500 in an axial direction of the motor rotor 10d with a magnetic barrier is T, the magnetic barrier hole 310 has a first side 311 and a second side 312 that are oppositely disposed, the second side 312 is located on a side of the first side 311 away from a center of the rotor core 100, a distance between the first side 311 and the second side 312 is a thickness H of the magnetic barrier hole 310, and T > H is satisfied. Specifically, the greater the thickness of the permanent magnet 500 in the axial direction of the motor rotor 10d having the magnetic barrier, the more the permanent magnet torque of the motor is increased, thereby increasing the output torque of the motor and increasing the efficiency of the motor. Meanwhile, in order to ensure that the magnetic circuit in the quadrature axis magnetic conduction channel 600 is not blocked, the thickness of the magnetic barrier hole 310 should not be too large, and thus the thickness of the permanent magnet 500 is set to be greater than that of one layer of the magnetic barrier hole 310. The thickness of the magnetic barrier hole 310 refers to a distance from a first side 311 to a second side 312 of the magnetic barrier hole 310, and if the first side 311 and the second side 312 are arranged in parallel, the thickness of the magnetic barrier hole 310 refers to a shortest distance from the first side 311 to the second side 312; if the first side 311 and the second side 312 are disposed in a non-parallel manner, the thickness of the magnetic barrier hole 310 refers to a distance from the first side 311 to the second side 312, which is close to a middle portion of the magnetic barrier hole 310; if the magnetic barrier holes 310 are irregularly designed, the thickness of the magnetic barrier holes 310 may be an average value between the maximum distance and the minimum distance from the first side 311 to the second side 312.

Referring to fig. 1, in an embodiment, in a cross section perpendicular to an axial direction of the rotor 10 of the electric machine with a magnetic barrier, a thickness of a middle portion of the permanent magnet 500 is greater than thicknesses of both ends of the permanent magnet 500. Specifically, the permanent magnet 500 may be configured to have a thick middle portion and thin ends, such that the thickness of the middle portion of the permanent magnet 500 is greater than the thickness of the ends. Taking the arc-shaped permanent magnet 500 as an example, local demagnetization is easily generated in the middle inner surface area of the arc-shaped permanent magnet 500, and the arc-shaped permanent magnet 500 is designed to be a structure with a thick middle part and thin two ends, so that the local demagnetization phenomenon of the arc-shaped permanent magnet 500 can be relieved. In addition, the design of the permanent magnet 500 with different thicknesses can prevent the permanent magnet 500 from sliding in the curved slot 200, and the stability of the permanent magnet 500 in the curved slot 200 is improved. Further, a quadrature axis magnetic conduction channel 600 is formed between the layer of magnetic barrier holes 310 close to the curved slot 200 and the curved slot 200, and if the permanent magnet 500 adopts a structure with a thick middle part and thin two ends, the width of the quadrature axis magnetic conduction channel 600 is increased, so that the q-axis inductance is increased, that is, the value of Lq is increased, the inductance difference between Ld and Lq is increased, the reluctance torque is increased, and the torque output capability of the motor is improved.

Referring to fig. 1 to 3, in an embodiment, a gap is formed between two ends of the permanent magnet 500 and two ends of the curved slot 200 embedded therein, so that a situation that a d-axis armature magnetic potential is concentrated on an end of the permanent magnet 500 is effectively avoided, and a demagnetization current of the motor can be improved well. The gap can be filled with air, and further, the gap can be used for filling non-magnetic-conductive media. Specifically, the gap is filled with air or a non-magnetic medium, so that the situation that the end part of the permanent magnet 500 is easy to demagnetize and is not saturated in magnetization is avoided, and the demagnetization resistance of the motor is improved.

Referring to fig. 3, in an embodiment, the curved groove 200 is disposed in a U shape. Specifically, when the curved groove 200 is formed in a U-shape, the curved groove 200 may be divided into three parts, i.e., a left part, a bottom part and a right part, which may be connected to each other or separated from each other, as long as it is ensured that the general shape thereof is formed in a U-shape. The permanent magnet 500 is arranged in a rectangular block shape, because the arc-shaped permanent magnet 500 is greatly influenced by materials in the forming aspect, the finishing processes at the later forming stage are more, and the forming and machining processes of the rectangular permanent magnet 500 are relatively simple, so that the rectangular permanent magnet 500 is adopted to improve the production efficiency, and the universality is strong. The permanent magnet 500 may be placed in any one of the left, bottom and right portions, may be placed in any two of the left, bottom and right portions, or may be placed in all of the left, bottom and right portions, and is not particularly limited.

In another embodiment, the curved groove 200 is disposed in a V shape (not shown). Specifically, when the curved groove 200 is disposed in a V shape, the curved groove 200 may be divided into a left half and a right half, and the permanent magnet 500 is disposed in a rectangular block shape. The permanent magnet 500 may be installed in the left half of the curved groove 200, may be installed in the right half of the curved groove 200, and may be installed in both the left half and the right half.

Referring to fig. 1, in another embodiment, the curved groove 200 is disposed in an arc shape. Specifically, when the curved groove 200 is disposed in an arc shape, the permanent magnet 500 may also be disposed in an arc shape, the shape of the permanent magnet 500 is adapted to the shape of the curved groove 200, and the permanent magnet 500 is adapted to be installed in the curved groove 200.

The utility model discloses still provide a motor, the motor is including the electric motor rotor 10 that has the magnetic barrier to and the cover is established the stator in the electric motor rotor 10 outside that has the magnetic barrier, the stator includes stator core and the winding of winding on the stator tooth. The specific structure of the motor rotor 10 with the magnetic barrier refers to the above embodiments, and since the motor adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here. The motor can be applied to air-conditioning compressors, electric vehicles, fan systems and the like, and the utilization of the reluctance torque of the motor can be increased, so that the efficiency of the motor is improved.

In an embodiment, the thickness of the motor rotor 10 having the magnetic barrier in the axial direction thereof is not less than the thickness of the stator in the axial direction thereof (not shown). The permanent magnet 500 is installed in the curved slot 200 of the rotor core 100, and the thickness of the motor rotor 10 with the magnetic barrier is made thicker, so that the volume for placing the permanent magnet 500 in the rotor core 100 is larger, thereby improving the permanent magnet torque of the motor and improving the output capacity of the motor.

The utility model discloses still provide a compressor, the compressor includes aforementioned motor. The specific structure of the motor refers to the above embodiments, and since the compressor adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.

The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. An electric machine rotor having a magnetic barrier, comprising:

a rotor core;

2. The rotor of an electric machine having a magnetic barrier as claimed in claim 1, wherein the curved slot has a first side wall and a second side wall which are oppositely disposed, and the first side wall and the second side wall are both protruded toward the center of the rotor core.

3. The electrical machine rotor with a magnetic barrier of claim 2, wherein a straight-axis magnetic conduction channel is formed between any adjacent two of the magnetic barrier holes in one layer.

4. The rotor of an electric machine having a magnetic barrier of claim 1, further comprising a plurality of permanent magnets mounted to a plurality of said curved slots.

5. The rotor of claim 4, wherein the thickness of the permanent magnet in the d-axis direction of the rotor is T, the magnetic barrier hole has a first side and a second side opposite to each other, the second side is located on the side of the first side away from the center of the rotor core, and the distance from the first side to the second side is the thickness H of the magnetic barrier hole, and T > H is satisfied.

6. The rotor of an electric machine having a magnetic barrier as set forth in claim 4, wherein the thickness of the middle portion of the permanent magnet is larger than the thickness of both ends of the permanent magnet in a cross section perpendicular to the axial direction of the rotor of an electric machine having a magnetic barrier.

7. An electric machine rotor with a magnetic barrier as claimed in claim 4, characterized in that there is a gap between both ends of the permanent magnet and both ends of the curved slot in which it is embedded, the gap being filled with a non-magnetic conductive medium.

8. The rotor of an electric motor having a magnetic barrier as set forth in claim 1, wherein said curved groove is provided in a U-shape.

9. The rotor of an electric motor having a magnetic barrier as set forth in claim 1, wherein said curved groove is provided in a V-shape.

10. The rotor of an electric motor having a magnetic barrier as set forth in claim 1, wherein said curved groove is formed in an arc shape.

11. An electric machine comprising a rotor of an electric machine with a magnetic barrier as claimed in any one of claims 1 to 10, and a stator fitted around the rotor of the electric machine with a magnetic barrier, the stator comprising a stator core and windings wound around stator teeth.

12. The motor according to claim 11, wherein a thickness of the motor rotor having the magnetic barrier in an axial direction thereof is not smaller than a thickness of the stator in the axial direction thereof.

13. A compressor, characterized in that it comprises an electric motor according to claim 11.