CN220342121U

CN220342121U - Motor, compressor and refrigeration equipment

Info

Publication number: CN220342121U
Application number: CN202321993032.7U
Authority: CN
Inventors: 程文; 毛临书; 徐飞; 帅康
Original assignee: Anhui Meizhi Compressor Co Ltd
Current assignee: Anhui Meizhi Compressor Co Ltd
Priority date: 2023-07-25
Filing date: 2023-07-25
Publication date: 2024-01-12
Anticipated expiration: 2033-07-25

Abstract

The utility model discloses a motor, a compressor and refrigeration equipment, wherein the motor comprises a stator and a rotor, the stator comprises a stator core and a stator winding, the rotor comprises a rotor core and a permanent magnet arranged in the rotor core, the stator winding is a three-phase winding which adopts triangle connection, the three-phase winding is wound on a plurality of teeth of the stator core, and the three-phase winding adopts triangle connection mode, namely, the three-phase winding is sequentially connected end to end.

Description

Motor, compressor and refrigeration equipment

Technical Field

The utility model relates to the technical field of motors, in particular to a motor, a compressor and refrigeration equipment.

Background

Along with the development of the motor, the motor miniaturization requirement is higher and higher, the motor is more obvious on low-voltage direct-current household appliances, and because the number of turns of a motor winding is small and the wire diameter is large, the motor miniaturization can bring manufacturing difficulty, the size is more difficult to make, and the torque density can also be reduced. Therefore, increasing torque density from the design source to improve manufacturability is a goal pursued by researchers and is also a requirement for miniaturization development of motors.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a motor which can reduce the size of a stator winding, improve manufacturability and improve torque density.

The utility model also provides a compressor and refrigeration equipment applying the motor.

According to the motor provided by the embodiment of the first aspect of the utility model, the motor comprises a stator and a rotor, wherein the stator comprises a stator core and a stator winding, a plurality of tooth parts are arranged in the stator core at intervals along the circumferential direction of the stator core, through holes are defined by the circumference of the tooth parts, the stator winding is wound on the tooth parts, and the stator winding is a three-phase winding connected in a triangular mode; the rotor is rotationally arranged in the through hole and comprises a rotor iron core and permanent magnets arranged in the rotor iron core, and the residual magnetism of the permanent magnets is not lower than 1.2T.

The motor provided by the embodiment of the utility model has at least the following beneficial effects:

the stator core of stator has a plurality of tooth portions that set up along its circumference interval, the stator winding is three-phase winding, three-phase winding winds and establishes on stator core's a plurality of tooth portions, because three-phase winding adopts triangle-shaped connected mode, namely three-phase winding end to end in proper order, for star connected mode, can save the public end of wiring, simplify wiring structure, make stator winding's overall dimension can design littleer, make easier realization, thereby can improve manufacturability, and the remanence of permanent magnet that adopts on the rotor core is not less than 1.2T, can improve torque density, be favorable to reducing motor's volume, satisfy miniaturized design's requirement, be applicable to products such as low-voltage household electrical appliances, on-vehicle refrigerator compressor.

According to some embodiments of the utility model, a tooth slot is formed between adjacent tooth portions, and a minimum distance between the tooth slot and an outer periphery of the stator core is 3mm or more and 6mm or less.

According to some embodiments of the utility model, the port at which the tooth slot communicates with the through hole is a slot, and a cross-sectional contour line of an end of the tooth slot away from the slot is a straight line.

According to some embodiments of the utility model, a ratio of an inner diameter of the stator core to an outer diameter of the stator core is 0.55 or more and 0.66 or less.

According to some embodiments of the utility model, the stator core has a regular polygon structure, and the side length of the stator core is d ₁ The inner diameter of the stator core is d ₂ The stator core is characterized in that mounting holes are respectively arranged at corners of the stator core, tooth grooves are formed between adjacent tooth parts, and the minimum distance between each tooth groove and each mounting hole is l ₁ The method comprises the following steps: 0.09 x l ₁ ≤d ₂ /d ₁ ≤0.11*l ₁ 。

According to some embodiments of the utility model, tooth grooves are formed between adjacent tooth parts, the number of the tooth grooves is greater than or equal to 9, and the number of poles of the rotor is greater than or equal to 6.

According to some embodiments of the utility model, a tooth slot is formed between adjacent tooth parts, a port of the tooth slot, which is communicated with the through hole, is a notch, and the width of the notch is greater than or equal to 2.2mm and less than or equal to 3.2mm.

According to some embodiments of the utility model, the stator core includes a yoke and a plurality of the teeth arranged at intervals along an inner peripheral wall of the yoke, the teeth having a width b ₁ The minimum thickness of the yoke part is b ₂ The method comprises the following steps: b is more than or equal to 1.0 ₁ /b ₂ ≤1.5。

According to some embodiments of the utility model, the permanent magnet is a rare earth or non-heavy rare earth permanent magnet material.

According to some embodiments of the utility model, the rotor core has a height greater than the stator core and a height difference greater than 0mm and less than or equal to 8mm.

According to some embodiments of the present utility model, the rotor core is provided with a magnetic steel groove for installing a permanent magnet, the peripheral wall of the rotor core is provided with a plurality of first notches along the circumferential direction thereof, two first notches close to the same permanent magnet are symmetrically arranged along the magnetic pole center line, and the minimum distance between the first notches and the magnetic steel groove is greater than or equal to 0.4mm and less than or equal to 0.6mm.

According to some embodiments of the utility model, the pole pair number of the rotor is p, and the central angle corresponding to the first notch is α, which satisfies: 45 DEG/p < alpha < 135 DEG/2 p.

According to some embodiments of the utility model, the rotor core is provided with a magnetic steel groove for installing a permanent magnet, two second notches are arranged in one side, close to the central axis of the rotor core, of the magnetic steel groove, the two second notches are respectively close to two ends of the permanent magnet, and the second notches are arc-shaped and have a radius of 0.3mm or more.

A compressor according to an embodiment of the second aspect of the present utility model includes the motor according to the embodiment of the first aspect.

The compressor provided by the embodiment of the utility model has at least the following beneficial effects:

the motor of the embodiment is adopted by the compressor, as the stator winding adopts the three-phase windings which are connected in a triangle way, namely the three-phase windings are sequentially connected end to end, compared with a star connection way, a common end of wiring can be omitted, the wiring structure is simplified, the whole size of the stator winding can be designed smaller, and the manufacturing is easier to realize, so that the manufacturability can be improved, the remanence of a permanent magnet adopted on a rotor core is not lower than 1.2T, the torque density can be improved, the volume of the compressor is reduced, the requirement of miniaturized design is met, and the motor is suitable for refrigerating equipment such as household refrigerators, vehicle-mounted refrigerators and the like.

A refrigeration appliance according to an embodiment of a third aspect of the present utility model includes a compressor according to an embodiment of the second aspect described above.

The refrigeration equipment provided by the embodiment of the utility model has at least the following beneficial effects:

the compressor of the embodiment is adopted by the refrigeration equipment, the stator winding of the compressor motor adopts the three-phase winding in triangular connection, compared with a star connection mode, a common terminal of wiring can be omitted, the wiring structure is simplified, the whole size of the stator winding can be designed smaller, and the manufacture is easier to realize, so that the manufacturability can be improved, the remanence of a permanent magnet adopted on a rotor core is not lower than 1.2T, the torque density can be improved, the size of the compressor is reduced, and the requirement of miniaturized design is met.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

Fig. 1 is a schematic front view of a stator core according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of delta connection of stator windings according to an embodiment of the present utility model;

fig. 3 is a schematic front view of a rotor core according to an embodiment of the present utility model;

FIG. 4 is an enlarged schematic view of the structure shown at A in FIG. 3;

fig. 5 is a schematic diagram of an assembly structure of a stator core and a rotor core according to an embodiment of the present utility model;

fig. 6 is a schematic cross-sectional structure of a compressor according to an embodiment of the present utility model.

Reference numerals:

a stator 100; a stator core 110; a yoke 111; a tooth 112; a protrusion 1121; a through hole 113; tooth slots 114; a notch 115; a mounting hole 116; stator windings 120;

a rotor 200; a rotor core 210; a shaft hole 211; a magnetic steel groove 212; a second notch 2121; a first notch 213;

a compressor 300; a housing 310; a crankshaft 320; a crankcase 330; a connecting rod 340; a piston 350.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "front", "rear", "upper", "lower", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the present utility model, the description of "first", "second", etc. is only for the purpose of distinguishing technical features, and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, it should be noted that terms such as arrangement, installation, connection, etc. should be construed broadly, and those skilled in the art may reasonably determine the specific meaning of the foregoing terms in the present utility model in combination with the specific content of the technical solution.

The following description of the embodiments of the present utility model will be made with reference to the accompanying drawings, in which it is apparent that the embodiments described below are some, but not all embodiments of the utility model.

Referring to fig. 1 and 6, the motor provided by the embodiment of the utility model is applied to a compressor 300, and specifically comprises a stator 100 and a rotor 200, wherein the stator 100 comprises a stator core 110 and a stator winding 120, the stator core 110 is provided with a through hole 113 penetrating along the axial direction of the stator core, the inner wall surface of the stator core 110 is further provided with a plurality of teeth 112, the teeth 112 are arranged at intervals along the circumferential direction of the stator core 110, tooth grooves 114 are formed between adjacent teeth 112, the teeth 112 define the through hole 113, the stator winding 120 is wound around the teeth 112, and the rotor 200 can be rotatably arranged in the through hole 113.

Referring to fig. 2, in the embodiment, the stator winding 120 is a three-phase winding, specifically including an a-phase winding Z _A Phase B winding Z _B And C phase winding Z _C Wherein the A phase winding Z _A And C phase winding Z _C Is connected with the tail end of the phase A winding Z _A Tail end of (B) phase winding Z _B Is connected with the head end of the B phase winding Z _B Tail end of (C) phase winding Z _C Is the head end connection of the A phase winding Z _A Phase B winding Z _B And C phase winding Z _C And are connected end to end in turn, thereby forming a triangular connection.

As can be understood from fig. 1, in the embodiment, the teeth 112 have 9 teeth slots 114, the number of teeth slots 114 is 9, each phase winding is correspondingly wound on three teeth 112, and the three teeth 112 of one phase winding are separated by two teeth 112 of the other two phases, i.e. the three teeth 112 of each phase winding are not adjacently arranged, and it should be noted that each phase winding comprises three coils, and the three coils are wound in one-to-one correspondence with the three teeth 112, so that the phase a winding Z _A Phase B winding Z _B And C phase winding Z _C Can be connected end to end in proper order to form triangle-shaped connection.

It should be noted that, the motor of the embodiment of the present utility model is suitable for products such as low-voltage home appliances and the compressor 300 of a vehicle-mounted refrigerator, and specifically illustrates a vehicle-mounted refrigerator as an example, the three-phase winding adopts a triangle connection mode, the motor adopts a low-voltage dc platform to supply power, the wire diameter of the winding can be smaller, compared with a star connection mode, the common terminal of wiring can be omitted, the number of connectors is reduced, the wiring structure is simplified, the overall size of the stator winding 120 can be designed smaller, the manufacturing is easier to realize, and the manufacturability can be improved.

It is understood that rotor 200 includes rotor core 210 and permanent magnets built into rotor core 210.

Referring to fig. 3, fig. 3 shows a structure of a rotor core 210, the rotor core 210 is provided with a shaft hole 211 for connecting a crankshaft 320, in the embodiment, a plurality of permanent magnets are provided, a plurality of magnetic steel grooves 212 penetrating along the axial direction of the rotor core 210 are provided on the rotor core 210, the plurality of magnetic steel grooves 212 are distributed at intervals along the circumferential direction of the rotor core 210, and the plurality of permanent magnets are connected in the plurality of magnetic steel grooves 212 in a one-to-one correspondence. The rotor 200 is rotatably installed in the through hole 113 of the stator 100 during assembly, and the rotor 200 is supported by a bearing or the like in the motor, so that the rotor 200 can stably operate in the stator 100.

It should be noted that, the residual magnetism of the permanent magnet adopted in the embodiment is not lower than 1.2 tesla (T), for example, the residual magnetism of the permanent magnet may be 1.2T, 1.5T, 1.8T, etc., and specifically, the residual magnetism is selected according to practical application requirements. The residual magnetization is called residual magnetization, which means that after the magnet is magnetized to saturation, the external magnetic field is removed, and a certain magnetization can be maintained in the original external magnetic field direction. The limit value of remanence is the saturation magnetization. The remanence of a permanent magnet material is mainly affected by the orientation of the individual grains and the domain structure in the material.

It can be understood that for the direct current motor, under the same winding parameters and test conditions, the higher the residual magnetism of the magnet is, the larger the maximum torque is, the torque density can be improved, and the improvement of the magnetic load is facilitated; the remanence of the permanent magnet is limited to be more than 1.2T, the purpose of less number of turns used by the same no-load back electromotive force is achieved under the same rotating speed, and the thicker the wire diameter is, the more difficult the winding is, considering the fact that the number of turns is less under the same slot full rate, the three-phase winding of the stator 100 adopts triangle connection to replace star connection, so that the wire diameter can be reduced by 1.732 times, manufacturability is improved, the motor size can be reduced, and the requirement of motor miniaturization design is met.

In the embodiment of the utility model, the permanent magnet is made of rare earth permanent magnet material or non-heavy rare earth permanent magnet material, specifically, the rare earth permanent magnet material is an alloy formed by samarium and neodymium mixed rare earth metal and transition metal (such as cobalt, iron and the like), and is a magnetic material prepared by magnetizing a magnetic field.

The non-heavy rare earth permanent magnetic material refers to a permanent magnetic material which does not contain rare earth elements such as neodymium, samarium and the like, for example, fe-Co-V alloy based on a bainite phase, fe-Nd-B alloy based on a neodymium-iron-boron phase and the like, has high coercive force and excellent magnetic performance, and has higher magnetic performance than the traditional rare earth permanent magnetic material. The adoption of the rare earth material with high magnetic performance or the rare earth material without heavy weight can restrict the remanence of the permanent magnet, is favorable for improving the magnetic load, reduces the volume of the motor and improves the torque density and the power density.

Referring to fig. 1, in the embodiment of the present utility model, the stator core 110 has a quadrilateral structure, and is particularly square, it can be understood that the stator core 110 is formed by stacking square stator punching sheets, so that the processing is simple, the manufacturing is convenient, the square stator core 110 can be directly installed and fixed in the compressor 300, the installation is easier, and the assembly efficiency is improved.

It can be understood that in the embodiment, the number of the tooth slots 114 of the stator 100 is 9, the number of poles of the rotor 200 is 6, the structural design is reasonable, the operation requirement of the low-voltage motor is met, the adoption of a plurality of tooth slots 114 and a multi-pole structure is beneficial to noise reduction, and meanwhile, the cost brought by the stator winding 120 can be reduced.

Of course, the number of slots 114 of stator core 110 is Q and the number of poles of rotor 200 is p1 in some embodiments, satisfying Q.gtoreq.gtoreq.9 and p 1.gtoreq.gtoreq.6, for example, slots 114 having 12 and poles having 8, which are selected according to practical application requirements.

Referring to fig. 1, it will be understood that the stator core 110 is formed by stacking a plurality of stator laminations, the stator core 110 includes a yoke 111 and a plurality of teeth 112, the plurality of teeth 112 are arranged on an inner peripheral wall of the yoke 111 at intervals, an outer peripheral edge of the yoke 111 is in a quadrilateral shape, the teeth 112 and the yoke 111 are surrounded to form a tooth slot 114, and in an embodiment, a minimum distance between the tooth slot 114 and the outer peripheral edge of the stator core 110 is d ₃ The method comprises the following steps: d is less than or equal to 3mm ₃ And less than or equal to 6mm, that is, the minimum distance between the bottom wall of the slot 114 and the outer periphery of the stator core 110 is 3mm or more and 6mm or less, and the bottom wall of the slot 114 is the wall surface of the slot 114 at the end far away from the through hole 113.

Specifically, the minimum distance d described above in the embodiments ₃ May be 4mm. Of course, here is an example, d ₃ Or 3mm, 5mm, 6mm, etc., satisfying d of 3mm or less ₃ Under the condition of less than or equal to 6mm, the minimum width of the yoke 111 of the stator 100 can be limited, the magnetic density of the yoke 111 is ensured not to be saturated too, and the overload capacity of the motor is ensured.

The outer edge of the yoke 111 is not limited to a quadrangle, and may be pentagonal, hexagonal, or circular, and may be specifically set according to practical application requirements.

It should be noted that, the port where the slot 114 communicates with the through hole 113 is a slot 115, the cross-sectional contour line of the bottom wall of the slot 114 is a straight line, that is, the bottom wall of the slot 114 is a plane, and the width of the slot 114 gradually decreases along the direction of the bottom wall toward the slot 115, and the cross section is approximately trapezoidal. It will be appreciated that by providing the bottom wall of the slots 114 as a planar surface, the slot pattern of the slots 114 is limited, maximizing the spring spacing between the stator windings 120 and the mounting holes 116, and ensuring reliability.

It is understood that the split ratio of the motor is the ratio of the inner diameter to the outer diameter of the stator 100. Under the condition that the outer diameter of the stator 100 is determined, the motor performance is improved by changing the inner diameter of the stator 100, and the production cost is reduced, so that the aim of optimizing the split ratio is fulfilled.In the process of optimizing the split ratio, a plurality of parameters are changed, for this reason, the split ratio is limited in the embodiment of the present utility model, specifically, the outer diameter of the stator core 110 is d ₁ The stator core 110 has an inner diameter d ₂ The method comprises the following steps: d is more than or equal to 0.55 ₂ /d ₁ Less than or equal to 0.66, that is, the crack ratio of the motor is 0.55 or more and 0.66 or less, the crack ratio may be 0.55, 0.60, 0.66 or the like in a specific example.

When the outer periphery of the yoke 111 is circular, the inner diameter of the stator core 110 is the diameter of the through hole 113, and the outer diameter of the stator core 110 is the outer diameter of the yoke 111.

Referring to fig. 1, when the outer circumference of the yoke 111 is quadrangular, the outer diameter of the stator core 110 may be understood as the side length of the stator core 110, and the crack ratio is the inner diameter d of the stator core 110 ₂ Side length d with stator core 110 ₁ The ratio is as follows: d is more than or equal to 0.55 ₂ /d ₁ And less than or equal to 0.66, the crack ratio is limited to a certain extent under the condition, and the outer diameter of the rotor 200 is improved to the maximum extent, so that the moment of inertia is improved, and the motor efficiency at low speed is ensured.

Referring to fig. 1, the stator core 110 is provided with mounting holes 116, and the stator core 110 can be fixedly mounted in the compressor 300 by inserting a connecting member such as a bolt through the mounting holes 116. In the embodiment, the number of the mounting holes 116 is 4, the 4 mounting holes 116 are respectively positioned at the corners of the stator core 110, and the minimum distance between the tooth slots 114 and the mounting holes 116 is l ₁ The method comprises the following steps: 0.09 x l ₁ ≤d ₂ /d ₁ ≤0.11*l ₁ That is, the split ratio of the motor is greater than or equal to 0.09 x l ₁ And less than or equal to 0.11 x l ₁ By limiting the crack ratio and the distance between the mounting holes 116 under the above conditions, the electrical safety distance and the structurally reliable operation can be ensured with the motor mounting size limited.

It will be appreciated that 0.55 d is satisfied ₂ /d ₁ Less than or equal to 0.66 and 0.09 x l ₁ ≤d ₂ /d ₁ ≤0.11*l ₁ In the case of (2), l can be calculated ₁ In the range of 6.0 to 6.1, that is, the minimum distance between the tooth slot 114 and the mounting hole 116 is 6.0mm to 6.1mm.

Referring to fig. 1, the tooth 112 has a width b along the circumferential direction of the stator core 110 ₁ The minimum thickness of the yoke 111 in the radial direction of the stator core 110 is b ₂ The method comprises the following steps: b is more than or equal to 1.0 ₁ /b ₂ Less than or equal to 1.5, that is, the ratio of the width of the tooth 112 to the minimum thickness of the yoke 111 is 1 or more and 1.5 or less, when the ratio of the two is 1, it means that the width of the tooth 112 is equal to the minimum thickness of the yoke 111; when the ratio of both is equal to 1.5, it means that the width of the tooth portion 112 is equal to 1.5 times the minimum thickness of the yoke portion 111. By limiting the ratio of the tooth width to the thickness of the yoke 111, the magnetic adhesion between the tooth 112 and the yoke 111 is ensured, and the iron loss is reduced; when the ratio of the width of the tooth 112 to the thickness of the yoke 111 is less than 1 or greater than 1.5, the density distribution is not uniform, the motor stability is affected, and noise is easily generated. In the embodiment, the minimum thickness b of the yoke 111 ₂ Equal to the minimum distance d between the tooth slots 114 and the outer periphery of the stator core 110 ₃ 。

Referring to fig. 1, it can be understood that the end of the tooth 112 away from the yoke 111 is provided with two protrusions 1121, the two protrusions 1121 are respectively located at two sides of the tooth 112, a notch 115 is formed between the protrusions 1121 of adjacent teeth 112, and the width of the notch 115 along the circumferential direction of the stator core 110 is b ₃ The method comprises the following steps: b is less than or equal to 2.2mm ₃ The size of the notch 115 may be 2.2mm, 3.0mm, 3.2mm, etc. specifically, the rotation is performed according to practical requirements. It can be appreciated that by limiting the size of the slot 115, manufacturability of the motor windings is ensured; if the notch 115 is too small to facilitate the offline, the manufacturability is deteriorated; if the notch 115 is too large, the leak is severe, and reliability cannot be ensured.

Considering that the motor is applicable to the compressor 300 of the vehicle-mounted refrigerator, the requirements on noise and energy efficiency of the motor are also higher, so that the research on reliability and noise improvement of the motor is critical, and the rotor core 210 of the motor is optimized.

Referring to fig. 5, in the embodiment of the present utility model, the height of the rotor core 210 is greater than the height of the stator core 110, and the height difference between the two is h, which satisfies the following conditions: 0mm < h.ltoreq.8mm, specifically, the height difference h may be 2mm, 5mm, 8mm, or the like, for example, the height of the rotor core 210 is 50mm, the height of the stator core 110 is 46mm, and the height difference between the rotor core 210 and the stator core 110 is 4mm. It will be appreciated that, due to the limited space of the rotor 200, the volume is small and the weight is light, by limiting the height difference, the axial length of the rotor 200 is increased, the weight of the rotor 200 is increased, the moment of inertia is further increased, and the efficiency of the low-speed motor is improved.

Referring to fig. 3 and 4, the outer peripheral wall of the rotor core 210 is provided with a plurality of first notches 213, the plurality of first notches 213 are spaced apart along the circumferential direction of the rotor core 210, two first notches 213 close to the same permanent magnet are symmetrically arranged along the magnetic pole center line of the permanent magnet, specifically, the magnetic pole center line shown in fig. 4 is a vertical line of the center position of the permanent magnet, the outer peripheral edge of the rotor core 210 is provided with two first notches 213 close to the permanent magnet, and the two first notches 213 are respectively close to two ends of the permanent magnet and are symmetrical with respect to the magnetic pole center line.

Wherein the minimum distance between the first notch 213 and the magnetic steel groove 212 is d ₄ The method comprises the following steps: d is more than or equal to 0.4mm ₄ Less than or equal to 0.6mm, specifically, the minimum distance d in the examples ₄ Can be 0.4mm, 0.5mm, 0.6mm and the like, and can be specifically selected according to the practical application requirements. It can be understood that by forming the first notch 213 on the surface of the rotor core 210, the radial electromagnetic force and the torque of the tooth slot 114 can be improved, the noise can be improved, and the requirement of 0.4mm < d can be satisfied by adding the first notch 213 ₄ At a distance of 0.6mm or less, the distance between the first notch 213 and the magnetic steel groove 212 is prevented from being excessively large or excessively small, and manufacturability can be ensured.

Referring to fig. 4, the pole pair number of the rotor 200 is p, the central angle corresponding to the first notch 213 is α, specifically, the central angle corresponding to the first notch 213 is an angle formed by passing through radii at both ends of the first notch 213 with the center of the rotor core 210 as the center, and the relationship between the central angle α and the pole pair number p satisfies: in the embodiment, the pole pair number of the motor is 6, and according to the relation, the central angle range corresponding to the first notch 213 is 7.5-11.3 degrees, and it can be understood that the included angle of the second notch 2121 can be limited under the condition that 45 °/p < α < 135 °/2p is satisfied, so as to ensure the improvement effect of radial electromagnetic force.

Referring to fig. 3 and fig. 4, two second notches 2121 are disposed on a side of each magnetic steel groove 212 near the central axis of the rotor core 210, the two second notches 2121 are disposed near two ends of the permanent magnet respectively, and may be symmetrically distributed, specifically, the inner wall of the magnetic steel groove 212 is recessed towards the central direction of the rotor core 210 to form the second notch 2121, and on the cross section, the contour line of the second notch 2121 is arc-shaped, and the radius is R, so that: r.gtoreq.0.3 mm, for example, the radius of the second notch 2121 may be 0.3mm, 0.5mm, 0.6mm, etc. It will be appreciated that by providing the second notch 2121 near the central axial end of the magnet steel groove 212, demagnetization can be improved and anti-demagnetization capability can be improved.

Referring to fig. 6, an embodiment of the present utility model further provides a compressor 300, including the motor of the above embodiment, where the compressor 300 is applied to a low-voltage dc platform, taking a vehicle-mounted refrigerator as an example, the compressor 300 further includes a housing 310, a crankshaft 320, a crankcase 330, a connecting rod 340, and a piston 350, where the motor, the crankshaft 320, the crankcase 330, the connecting rod 340, and the piston 350 are all installed in the housing 310, where the stator 100 is fixedly connected in the housing 310, one end of the crankshaft 320 is inserted into a shaft hole 211 of the rotor core 210, so that the crankshaft 320 is fixedly connected with the rotor core 210, and the other end is inserted into the crankcase 330 and connected with the piston 350 through the connecting rod 340, and when the motor drives the crankshaft 320 to rotate, the crankshaft 320 can drive the piston 350 to move through the connecting rod 340, so as to implement compression work.

The motor of the above embodiment is adopted in the compressor 300, since the stator winding 120 adopts the three-phase winding with triangular connection, the overall size can be designed smaller, and the manufacturing is easier to realize, so that the manufacturability can be improved, and the remanence of the permanent magnet adopted on the rotor core 210 is not lower than 1.2T, so that the torque density can be improved, the size of the compressor 300 can be reduced, and the requirement of miniaturized design can be met. Since the present compressor 300 adopts all the technical solutions of all the embodiments, at least the beneficial effects of the technical solutions of the embodiments are provided, and will not be described in detail herein.

The embodiment of the utility model also provides a refrigeration device, which can be a household refrigerator or a vehicle-mounted refrigerator, and comprises the compressor 300 of the embodiment. The refrigeration equipment adopts all the technical schemes of all the embodiments, so that the refrigeration equipment at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims

1. An electric motor, comprising:

the stator comprises a stator core and a stator winding, wherein a plurality of teeth are arranged in the stator core at intervals along the circumferential direction of the stator core, through holes are defined by the peripheries of the teeth, the stator winding is wound on the teeth, and the stator winding is a three-phase winding connected in a triangular mode;

the rotor is rotationally arranged in the through hole and comprises a rotor iron core and permanent magnets arranged in the rotor iron core, and the residual magnetism of the permanent magnets is not lower than 1.2T.

2. The motor of claim 1, wherein tooth grooves are formed between adjacent tooth portions, and a minimum distance between the tooth grooves and an outer periphery of the stator core is 3mm or more and 6mm or less.

3. The motor of claim 2, wherein the slot and the port through which the through hole communicates are slots, and a cross-sectional profile of an end of the slot remote from the slots is a straight line.

4. The electric machine of claim 1, wherein a ratio of an inner diameter of the stator core to an outer diameter of the stator core is 0.55 or more and 0.66 or less.

5. The electric machine according to claim 1 or 4, wherein the stator core has a regular polygon structure, and the stator core has a side length d ₁ The inner diameter of the stator core is d ₂ The stator core is characterized in that mounting holes are respectively arranged at corners of the stator core, tooth grooves are formed between adjacent tooth parts, and the minimum distance between each tooth groove and each mounting hole is l ₁ The method comprises the following steps: 0.09 x l ₁ ≤d ₂ /d ₁ ≤0.11*l ₁ 。

6. The motor of claim 1, wherein tooth grooves are formed between adjacent tooth portions, the number of tooth grooves is 9 or more, and the number of poles of the rotor is 6 or more.

7. The motor according to claim 1 or 6, wherein tooth grooves are formed between adjacent tooth portions, ports through which the tooth grooves communicate with the through holes are notch grooves, and a width of the notch grooves is 2.2mm or more and 3.2mm or less.

8. The motor of claim 1, wherein the stator core includes a yoke portion and a plurality of the tooth portions arranged at intervals along an inner peripheral wall of the yoke portion, the tooth portions having a width b ₁ The minimum thickness of the yoke part is b ₂ The method comprises the following steps: b is more than or equal to 1.0 ₁ /b ₂ ≤1.5。

9. The electric machine of claim 1, wherein the permanent magnets are rare earth or non-heavy rare earth permanent magnet materials.

10. The motor of claim 1, wherein the rotor core has a height greater than the stator core and a height difference greater than 0mm and less than or equal to 8mm.

11. The motor of claim 1, wherein the rotor core is provided with a magnetic steel groove for mounting a permanent magnet, a plurality of first notches are formed in the peripheral wall of the rotor core along the circumferential direction of the rotor core, two first notches close to the same permanent magnet are symmetrically formed along the central line of the magnetic pole, and the minimum distance between the first notches and the magnetic steel groove is greater than or equal to 0.4mm and less than or equal to 0.6mm.

12. The electric machine of claim 11, wherein the pole pair number of the rotor is p, and the central angle corresponding to the first notch is α, which satisfies: 45 DEG/p < alpha < 135 DEG/2 p.

13. The motor according to claim 1 or 11, wherein the rotor core is provided with a magnetic steel groove for mounting a permanent magnet, two second notches are formed in one side, close to the central axis of the rotor core, of the magnetic steel groove, the two second notches are respectively close to two ends of the permanent magnet, and the second notches are arc-shaped and have a radius of 0.3mm or more.

14. Compressor, characterized by comprising an electric motor according to any one of claims 1 to 13.

15. A refrigeration apparatus comprising the compressor of claim 14.