Stator core unit, stator core, motor and compressor

Abstract

The present invention discloses a stator core unit, a stator core, a motor, and a compressor. The stator core unit includes a stator yoke unit and a plurality of stator teeth disposed on the stator yoke unit. Each stator tooth is provided with an auxiliary groove. The line connecting the center of each auxiliary groove and the center point of the stator core is a first connecting line. Each first connecting line is offset by a predetermined angle in a direction opposite to a first rotational direction, relative to the centerline of the stator tooth in which it is located. The first rotational direction is the rotational direction of the motor. The predetermined angles of offset of each first connecting line relative to the centerline of the stator tooth in which it is located are different. The technical solution of the present invention can improve the electromagnetic noise excitation of a unidirectional rotating motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator core unit, a stator core, a motor and a compressor. Background Art

[0002] Currently, due to the bidirectional rotation of the rotor in motors, existing motor designs often employ symmetrical and evenly distributed auxiliary slots on the stator teeth to avoid introducing large harmonic magnetic fields and reduce the motor's cogging torque. However, this symmetrical stator design does not effectively improve the load torque waveform and radial force wave. This is particularly evident in unidirectionally rotating motors such as automotive drive motors, fan motors, range hood motors, and water pump motors. Summary of the Invention

[0003] The main purpose of the present invention is to provide a stator core unit, a stator core, a motor, and a compressor, aiming to improve the electromagnetic noise excitation of a unidirectional rotating motor. To achieve the above-mentioned purpose, the stator core unit proposed in the present invention includes:

[0004] a stator yoke unit; and

[0005] Multiple stator teeth are arranged on the stator yoke unit, each of the stator teeth is provided with an auxiliary groove, and the connecting line between the center of each auxiliary groove and the center point of the stator core is a first connecting line. Each first connecting line is offset by a preset angle in the opposite direction of a first rotation direction with respect to the center line of the stator tooth where it is located. The first rotation direction is the rotation direction of the motor, and the preset angles at which the first connecting lines are offset with respect to the center line of the stator tooth where it is located are different from each other.

[0006] Optionally, the preset angles at which the first connecting lines are offset with respect to the center line of the stator tooth portion where the first connecting lines are located decrease or increase sequentially in the opposite direction to the first rotation direction.

[0007] Optionally, each of the first connecting lines is offset by a preset angle with respect to a center line of the stator tooth portion where the first connecting line is located, and is offset in a direction opposite to the first rotation direction, and is sequentially reduced or increased according to a fixed angle;

[0008] Alternatively, the angles may be gradually reduced or increased according to a rule of gradual change.

[0009] Optionally, the auxiliary grooves are identical.

[0010] Optionally, the radial cross-section of each auxiliary groove is any one of semicircular, rectangular or triangular.

[0011] Optionally, the stator core unit is a stator punching unit, or is formed by stacking a plurality of stator punching units.

[0012] Optionally, the stator yoke unit is arranged in an arc shape or an annular shape.

[0013] The present invention also provides a stator core, which includes the stator core unit described above.

[0014] The present invention also provides a motor, comprising the stator core as described above.

[0015] Optionally, the motor further comprises a rotor, and the rotor is arranged in the stator core;

[0016] Alternatively, the rotor is arranged outside the stator core.

[0017] Optionally, when the motor is a built-in permanent magnet synchronous motor, the rotor includes:

[0018] rotor core;

[0019] A mounting groove is provided on the rotor core;

[0020] A permanent magnet is installed in the installation groove, and the permanent magnet rotates synchronously with the rotor core.

[0021] Optionally, when the motor is a surface-mounted permanent magnet synchronous motor, the rotor includes:

[0022] rotor core;

[0023] The permanent magnet is arranged on the wall surface of the rotor core facing the stator core.

[0024] The present invention also provides a compressor, comprising the motor as described above.

[0025] The stator core unit of the present invention is provided with a plurality of stator teeth on a stator yoke unit, each stator tooth being provided with an auxiliary groove, the connecting line between the center of each auxiliary groove and the center point of the stator core being a first connecting line, each first connecting line being offset by a preset angle in the opposite direction of the motor's rotation direction with respect to the center line of the stator tooth in which it is located, and the preset angles at which each first connecting line is offset with respect to the center line of the stator tooth in which it is located being different from each other. The technical solution of the present invention provides auxiliary grooves with different preset deflection angles on each stator tooth in the stator core unit, so that when the motor is running in one direction, the air gap magnetic field harmonics can produce a canceling effect, thereby reducing the harmonic content in the composite magnetic field, as well as the load torque fluctuation and radial force wave of the motor, thereby improving the electromagnetic excitation of the motor during unidirectional rotation. The present application overcomes the technical bias in existing motor designs that the stator core structure tends to be symmetrical, and utilizes an asymmetric structure to achieve more prominent beneficial effects than a symmetrical structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0027] Figure 1 Schematic diagram of the structure of a stator core according to an embodiment of the present invention;

[0028] Figure 2 Schematic diagram of the structure of another embodiment of the stator core of the present invention;

[0029] Figure 3 Schematic diagram of the structure of another embodiment of the stator core of the present invention;

[0030] Figure 4 Schematic diagram of the structure of another embodiment of the stator core of the present invention;

[0031] Figure 5 This is a schematic structural diagram of an embodiment of a motor according to the present invention;

[0032] Figure 6 A schematic structural diagram of a rotor in another embodiment of a motor of the present invention;

[0033] Figure 7 A schematic structural diagram of a rotor in another embodiment of a motor of the present invention;

[0034] Figure 8 A schematic structural diagram of a rotor in another embodiment of a motor of the present invention;

[0035] Figure 9 Schematic diagram comparing the radial electromagnetic force density of the motor of the present invention and the conventional motor.

[0036] Description of Figure Numbers:

[0037] Label name Label name 1 Unit motor L1 Centerline of stator teeth 11 stator core unit L2 First connecting line 111 stator yoke unit 12 stator core 112 stator teeth 13 rotor 113 stator slots 131 rotor core 1121 Auxiliary groove 132 permanent magnet

[0038] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0041] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0042] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] The present invention provides a stator core unit which can be applied to a motor.

[0044] From the perspective of composition structure, the motor can be considered to be composed of a stator core and a rotor core; but from the perspective of functional structure, it can be considered to be composed of one or more unit motors connected end to end. Here, a three-phase motor with a stator slot number of Z (hereinafter referred to as the slot number) and a pole number of 2P (equivalent to the pole pair number P) is used for illustration. The unit motor refers to the simplest structure represented by the number of slots and poles obtained by removing the greatest common divisor of the slot number (Z) and the pole pair number (P). The greatest common divisor is the number of unit motors. For example: a 9-slot 6-pole motor has 9 slots and 3 pole pairs, and the common divisor is 3; after removing the greatest common divisor, the slot pole number becomes 3 slots and 1 pair of poles, that is, 3 slots and 2 poles. Therefore, the corresponding 3-slot 2-pole structure in the 9-slot 6-pole motor is a unit motor, and the 9-slot 6-pole motor can also be considered to be composed of 3 unit motors connected end to end. The stator core unit in this specification is the stator core part that constitutes a unit motor.

[0045] At present, when designing motor structures, those skilled in the art often adopt a design concept of opening symmetrical auxiliary slots on the teeth of the stator core. The reason for this is that the motor has two operating conditions in two rotation directions. The use of this symmetrical structure can avoid the introduction of large harmonic magnetic fields when the motor is running in any rotation direction. At the same time, this symmetrical structural design can reduce the motor tooth torque to a certain extent. However, in fact, this structure does not significantly improve the motor torque fluctuation and radial force wave. The defects of this symmetrical design are more obvious in unidirectional rotating motors such as compressors. Based on this, the present application proposes a new stator core design concept to solve the problem that the traditional symmetrical stator structure design is not fully applicable to unidirectional rotating motors.

[0046] Figure 1 The stator core is formed by three stator core units 11, each of which includes three stator teeth 112 ( Figure 1 Only the first stator tooth 112 is identified. The auxiliary groove 1121 in each stator tooth 112 is offset by a predetermined angle relative to the centerline L1 of the stator tooth 112 in which it is located. For example, viewed in the direction opposite to the first rotational direction, the auxiliary groove 1121 in the first stator tooth 112 is offset by a predetermined angle γ, the auxiliary groove 1121 in the second stator tooth 112 is offset by a predetermined angle β, and the auxiliary groove 1121 in the third stator tooth 112 is offset by a predetermined angle α, where γ≠β≠α. Figure 1 The radial cross-section of the middle auxiliary groove 1121 is rectangular.

[0047] Figure 2 The radial cross section of the middle auxiliary groove 1121 is semicircular. Figure 3 The radial cross-section of the middle auxiliary groove 1121 is triangular.

[0048] Figure 4 The stator core 12 shown includes three stator core units 11 , and the stator yoke units 111 of the three stator core units 11 are arranged in a ring shape, that is, arranged as one body. Figure 5 The internal permanent magnet synchronous motor is composed of three unit motors 1 , each stator core unit 11 has three stator teeth 112 , and the three preset angles of the three stator teeth 112 are γ, β and α respectively along the opposite direction of the first rotation direction. Figure 6 A rotor 13 in a surface-mounted permanent magnet synchronous motor; Figure 7 It is a rotor 13 in a built-in permanent magnet synchronous motor. Figure 8It is a 12-slot internal permanent magnet synchronous motor, whose stator has 12 stator slots 113 and 12 stator teeth 112. The number of unit motors of the 12-slot internal permanent magnet synchronous motor is 1. The preset angles corresponding to the stator teeth in the motor are: α1, α2, α3, α4, α5, α6, α7, α8, α9, α10, α11 and α12 along the first rotation direction, and the preset angles α1 to α12 decrease successively along the first rotation direction.

[0049] Reference Figures 1 to 9 In one embodiment of the present invention, the stator core unit 11 includes:

[0050] a stator yoke unit 111 ; and

[0051] A plurality of stator teeth 112 are provided on the stator yoke unit 111, and an auxiliary groove 1121 is provided on each stator tooth 112. The connecting line between the center of each auxiliary groove 1121 and the center point of the stator core 12 is a first connecting line L2. Each first connecting line L2 is offset by a preset angle in the opposite direction of the first rotation direction with respect to the center line L1 of the stator tooth 112 in which it is located. The preset angles at which the first connecting lines L2 are offset with respect to the center line L1 of the stator tooth 112 in which it is located are different from each other; wherein the first rotation direction is the rotation direction of the motor.

[0052] In this embodiment, the stator yoke unit 111 can be an arc-shaped silicon steel sheet with a preset curvature, or a circular silicon steel sheet. A plurality of stator teeth 112 can be evenly spaced on the stator yoke unit 111 and can be respectively arranged toward the center point of the stator core 12, so that the central axis of each stator tooth 112 can pass through the center point of the stator core 12, and any two adjacent stator teeth 112 can be enclosed to form a stator slot 113 therebetween. The stator teeth 112 can be of a nearly tooth-shaped structure, and two boots can be separately provided on one end of the stator tooth 112 facing away from the stator yoke unit 111. The two boots can be provided on opposite sides of the end, and the two boots can be respectively inserted into the stator grooves formed on both sides of the stator tooth 112.

[0053] The technical solution of the present invention is to provide an auxiliary groove 1121 on each stator tooth 112, extending through the entire stator tooth 112 in the direction opposite to the direction of motor rotation. This allows the connecting line between the center of each auxiliary groove 1121 and the center point of the stator core 12, i.e., the first connecting line L2, to be offset from the center line L1 of the stator tooth 112 in which it is located by a predetermined angle. For example, if the motor rotates counterclockwise, the auxiliary groove 1121 on each stator tooth 112 is located to the right of the center line L1 of the stator tooth 112; whereas, if the motor rotates clockwise, the auxiliary groove 1121 on each stator tooth 112 is located to the left of the center line L1 of the stator tooth 112. It will be appreciated that those skilled in the art can adjust the distance between each auxiliary groove 1121 and the center line L1 of the stator tooth in which it is located to achieve different offset angles between each first connecting line L2 and the center line L1 of the stator tooth 112 in which it is located. In this way, when the motor runs in one direction, the air gap between the stator teeth 112 and the rotor 13 in each unit motor 1 can be different, and the air gap magnetic fields corresponding to different air gaps are also different. There is a canceling effect between different air gap magnetic field harmonics, so the total air gap magnetic field harmonics in each unit motor 1 can be reduced, and then the harmonic content in the motor's synthetic magnetic field can be reduced, and the load torque fluctuation and radial force wave (radial force wave can also be called radial electromagnetic force) of the motor can be reduced, thereby achieving the effect of improving the electromagnetic noise excitation of the motor.

[0054] It should be noted that the position of the auxiliary groove 1121 is related to the distance between it and the rotor core 131. The closer the distance, the more obvious the reduction of load torque fluctuation and radial force wave, and the better the improvement effect of the load torque waveform. Therefore, the auxiliary groove 1121 is preferably set on the end of the stator tooth 112 away from the stator yoke unit 111.

[0055] The stator core unit 11 of the present invention is formed by arranging a plurality of stator teeth 112 on the stator yoke unit 111, and each stator tooth 112 is provided with an auxiliary groove 1121. The connecting line between the center of each auxiliary groove 1121 and the center point of the stator core 12 is a first connecting line L2. Each first connecting line L2 is offset by a preset angle in the opposite direction of the motor rotation direction with respect to the center line L1 of the stator tooth 112 where it is located, and the preset angles at which each first connecting line L2 is offset with respect to the center line L1 of the stator tooth 112 where it is located are different from each other. The technical solution of the present invention is to provide auxiliary grooves with different preset deflection angles on each stator tooth 112 in the stator core unit 11, so that when the motor runs in one direction, the air gap magnetic field harmonics can produce a canceling effect, thereby reducing the harmonic content in the synthetic magnetic field, as well as the load torque fluctuation and radial force wave of the motor, thereby improving the electromagnetic noise excitation of the unidirectional rotating motor. In addition, the present application overcomes the technical bias in the existing motor design that the stator core structure tends to be symmetrically designed, and uses an asymmetric structure to achieve more outstanding beneficial effects than a symmetrical structure.

[0056] Reference Figures 1 to 9 In one embodiment of the present invention, the preset angle of each first connecting line L2, which is offset from the center line L1 of the stator tooth portion 112 where the first connecting line L2 is located, decreases in the opposite direction of the first rotation direction; or increases in the opposite direction of the first rotation direction.

[0057] In this embodiment, the technical solution of the present invention sequentially decreases or increases the offset angle of each first connecting line L2 in the stator core unit 11, thereby causing the air gap magnetic field generated by each auxiliary groove 1121 to also exhibit a corresponding changing trend. This allows designers, when designing the motor, to adjust the preset angle of each rear-end auxiliary groove 1121 so that the air gap magnetic field generated by each rear-end auxiliary groove 1121 can continuously offset the air gap magnetic field generated by the front-end auxiliary groove 1121, thereby reducing the harmonic content in the composite magnetic field. It should be noted that in other embodiments, the preset angle of each auxiliary groove 1121 can also exhibit an irregular changing trend. For example, the preset angle can also vary in a jumpy manner, such as first increasing and then decreasing the preset angle sequentially. It is sufficient that the air gap magnetic fields generated by each auxiliary groove 1121 ultimately offset each other. The technical solution of the present invention can not only minimize the air gap magnetic field of the stator core unit 11 itself, but also make the stator core unit 11 itself have an asymmetric structure by successively reducing or increasing each preset angle in the stator core unit 11 in the opposite direction of the motor rotation direction, further overcoming the technical bias of the existing stator core unit 11 design that the stator core unit 11 structure tends to be symmetrical. When the motor includes multiple unit motors 1, each subsequent stator core unit 11 can be obtained by copying the stator core unit 11 designed for the first time, which is beneficial to saving design costs.

[0058] Reference Figures 1 to 9 In one embodiment of the present invention, each of the first connecting lines L2 is offset by a preset angle with respect to the center line L1 of the stator tooth portion 112 where the first connecting line L2 is located, and decreases or increases in sequence according to a fixed angle in the opposite direction of the first rotation direction; or decreases or increases in sequence according to a rule of step-by-step angle change.

[0059] In this embodiment, there are two ways of decreasing or increasing in the opposite direction of the first rotation direction. The first is to increase or decrease in a fixed angle interval; the second is to increase or decrease in a different angle interval.

[0060] Here with Figure 1 Taking the counterclockwise rotation direction of the 9-slot 6-pole motor as an example for explanation, in the stator core unit 11, the angles corresponding to α, β, and γ increase in sequence in the clockwise direction. The first way of increasing is: the angular interval between γ and β is consistent with the angular interval between β and α, for example: the preset angle of γ is 5°, the preset angle of β is 10°, and the preset angle of α is 15°, that is, the interval between any two adjacent angles is 5°; the second way of increasing is: the angular interval between γ and β is inconsistent with the angular interval between β and α. Among them, the angular interval of the second way of increasing can be increased step by step, for example: the preset angle of γ is 5°, the preset angle of β is 10°, and the preset angle of α is 17°, that is, the intervals between the two adjacent angles are 5° and 7° respectively, showing a step-by-step increasing trend; or the angular interval can also be reduced step by step, for example: the preset angle of γ is 5°, the preset angle of β is 10°, and the preset angle of α is 14°, that is, the intervals between the two adjacent angles are 5° and 4° respectively, showing a step-by-step decreasing trend. The manner in which each preset angle is sequentially reduced in the opposite direction of the motor rotation direction may be the same as the above-mentioned manner in which it is increased, and will not be elaborated here.

[0061] In this way, the first increase / decrease method allows designers to simply determine the angular interval at which the first preset angle is increased in a stator core unit 11 in the direction opposite to the direction of motor rotation during the motor design phase, which helps save design time and cost. The second / decrease method allows for fine-tuning of the total air gap magnetic field harmonics in the unit motor 1 by continuously adjusting subsequent preset angles in actual design to minimize the total air gap magnetic field harmonics. This design method also allows for the flexible modification of the preset angles of subsequent auxiliary grooves 1121 when errors occur during the design and manufacturing phases, thereby improving the utilization rate of the stator punching sheets.

[0062] Reference Figures 1 to 9 In one embodiment of the present invention, each of the auxiliary grooves 1121 is identical.

[0063] In this embodiment, all auxiliary grooves 1121 are set throughout the stator tooth portion 112 in which they are located, and the radial cross-sectional shape of each auxiliary groove 1121 is set to be the same. In this embodiment, each auxiliary groove 1121 can adopt a straight groove structure. Of course, in other optional embodiments, each auxiliary groove 1121 can also adopt an oblique groove structure, or a mixed arrangement of straight groove and oblique groove structures. The technical solution of the present invention sets each auxiliary groove 1121 to be the same, so that in actual production, only one type of groove needs to be opened on the stator punching sheet, and there is no need to prepare multiple slotting tools for different types of grooves, which is conducive to improving the efficiency of mass production.

[0064] Reference Figures 1 to 9 In one embodiment of the present invention, the radial cross-section of each auxiliary groove 1121 is any one of a semicircular, rectangular or triangular shape.

[0065] In this embodiment, the radial cross-sectional shape of the auxiliary groove 11211 can be any of a semicircular, rectangular, or triangular shape. However, in other embodiments, the radial cross-sectional shape of the auxiliary groove 1121 can also be other shapes, such as: an elliptical, pentagonal, hexagonal, or other polygonal or irregular shape, as long as a groove with a corresponding spatial channel can be formed in the stator tooth portion according to the radial cross-sectional shape. By adopting simple shapes such as semicircular, rectangular, or triangular as the radial cross-sectional shape of the auxiliary groove 1121, the stator core unit of the present invention eliminates the need for complex slotting tools, reduces the manufacturing cost of the stator core unit, and thus helps reduce overall production costs.

[0066] Reference Figures 1 to 9 In one embodiment of the present invention, the stator core unit 11 is a stator punching unit; or, the stator core unit 11 is formed by stacking a plurality of stator punching units.

[0067] In this embodiment, in actual application, the stator punching unit can be divided into a large silicon steel sheet with a relatively thick single sheet and a small silicon steel sheet with a relatively thin single sheet according to the thickness. When the stator punching unit is a large silicon steel sheet with a relatively thick single sheet, one stator punching unit is a stator core unit 11, on which the stator yoke unit 111 and the plurality of stator teeth 112 are all integrally formed structures. When the stator punching unit is a small silicon steel sheet with a relatively thin single sheet, the multiple stator punching units can be aligned, stacked and compressed to form a stator core unit 11 with a corresponding thickness, and each stator punching unit has a stator yoke unit 111 and a plurality of stator teeth 112. The technical solution of the present invention is to set the stator core unit 11 as a stator punching unit, or to set it to be formed by stacking multiple stator punching units, so that the stator core unit 11 can be flexibly adjusted according to the actual thickness specifications of the stator punching unit in actual manufacturing.

[0068] Reference Figures 1 to 9 In one embodiment of the present invention, the stator yoke unit 111 is arranged in an arc shape; or, the stator yoke unit 111 is arranged in a ring shape.

[0069] In this embodiment, when the number of unit motors 1 in the motor is greater than one, the stator yoke unit 111 may be in the shape of an arc. When the stator yoke unit 111 is arranged in an arc shape, the central angle corresponding to each stator yoke unit 111 is determined by the number of unit motors in the motor, which is not limited here. For example, in a motor with three unit motors, the central angle corresponding to the stator yoke unit 111 in each unit motor is 120°. It is understood that multiple arc-shaped stator yoke units 111 can be spliced ​​end to end to form a circular stator core 12. When the number of unit motors in the motor is one, that is, the motor includes only one stator yoke unit 111, the stator yoke unit 111 is arranged in a circular ring, for example: the stator yoke unit 111 of a 12-slot, 10-pole motor. It should be noted that when the stator yoke unit 111 is arranged in a ring shape, the stator yoke unit 111 and the multiple stator teeth 112 are integrally formed. The technical solution of the present invention sets the stator yoke unit 111 to be arc-shaped or ring-shaped, so that the stator core unit 11 of the present invention can be flexibly adjusted according to the actual number of unit motors in the motor.

[0070] The present invention further provides a stator core 12, comprising the stator core unit 11 described above. The detailed structure of the stator core unit 11 can be found in the above-described embodiment and will not be further described here. It will be appreciated that, since the above-described stator core unit 11 is used in the stator core 12, the embodiments of the stator core 12 include all technical solutions of all the above-described embodiments of the stator core unit 11, and the technical effects achieved are identical, so further description will not be given here.

[0071] The present invention also provides a motor that can be used in electric vehicles, fans, range hoods, water pumps, or compressors. The motor includes the stator core 12 described above. The detailed structure of the stator core 12 can be found in the above-described embodiment and will not be further described here. It is understood that since the above-described stator core 12 is used in the stator core 12, the embodiments of this stator core 12 include all technical solutions of all the above-described embodiments of the stator core 12, and the technical effects achieved are identical, so further description is not given here.

[0072] In this embodiment, a winding coil may be wound around each stator tooth 112 in the stator core 12, so that each stator tooth 112 forms a stator winding. In practical applications, the winding coil may be connected to the three-phase output terminals of a three-phase inverter circuit. Under the control of a motor control device, the three-phase inverter circuit may control the on / off of each switching device therein according to a specific conduction logic to invert the input DC power into a three-phase AC power and output it to the corresponding winding coil. When the three-phase AC current flows through each winding coil, a magnetic field is formed within the motor, thereby driving the corresponding rotating component of the motor, such as the rotor 13, to rotate.

[0073] Reference Figures 1 to 9 In one embodiment of the present invention, the motor further includes a rotor 13, and the rotor 13 is disposed in the stator core 12;

[0074] Alternatively, the rotor 13 is disposed outside the stator core 12 .

[0075] In this embodiment, the rotor 13 can be formed by punching and compressing a number of rotor sheets. According to the relative positional relationship between the rotor 13 and the stator core 12, the motor can be divided into an inner rotor motor and an outer rotor motor. Specifically, when the rotor 13 is arranged inside the stator core 12, the motor is an inner rotor motor; when the rotor 13 is arranged outside the stator core 12, the motor is an outer rotor motor. When the motor is an inner rotor motor, the rotor 13 can be a nearly cylindrical body, and the center of the rotor 13 can be provided with an axial hole passing through the rotor 13 along its axial direction. The axial hole can be used to fix and install the rotating shaft; the rotor 13 is used to drive the rotating shaft to rotate synchronously when driven to rotate by the magnetic field generated by the stator core 12. The present invention utilizes the stator core 12 and the rotor 13 to form a motor. It can reduce the load torque fluctuation and radial force wave of the motor when it is running in one direction, and improve its electromagnetic noise excitation, which is beneficial to improving the stability of the overall working condition of the motor.

[0076] Reference Figures 1 to 9 In one embodiment of the present invention, when the motor is a built-in permanent magnet synchronous motor, the rotor 13 includes:

[0077] Rotor core 131;

[0078] A mounting groove, the mounting groove being provided on the rotor core 131;

[0079] The permanent magnet 132 is installed in the installation groove, and the permanent magnet 132 rotates synchronously with the rotor core 131.

[0080] In this embodiment, the mounting slots can be straight slots. The number of mounting slots is determined based on actual needs and is not limited here. Multiple mounting slots can be evenly distributed along multiple directions of the rotor core 131, each of which can be used to attach a permanent magnet 132 by gluing. It is understood that when the rotor core 131 rotates, the permanent magnet 132 rotates synchronously with the rotor core 131. In other embodiments, the rotor core 131 can also be provided with multiple mounting slot groups. Each mounting slot group can include a first mounting slot and a second mounting slot. The first and second mounting slots can be symmetrically arranged about a radial line of the rotor core to form a V-shaped structure with its opening facing away from the rotating shaft. Alternatively, each mounting slot group can include a first mounting slot, a second mounting slot, and a third mounting slot. The second mounting slot of the first mounting slot can also form a V-shaped structure with its opening facing away from the rotating shaft. The third mounting slot can be located at the opening of the V-shaped structure formed by the first and second mounting slots, forming a delta-shaped structure with its tip facing toward the rotating shaft. It is also understandable that when the motor is an interior permanent magnet synchronous motor, corresponding grooves can be provided on the rotor core 131 to cooperate with the auxiliary grooves provided on the stator teeth of the present invention to further improve the electromagnetic noise excitation of the unidirectional rotating motor. The technical solution of the present invention, by applying the proposed stator core 12 to the interior permanent magnet synchronous motor, is beneficial for reducing the harmonic content in the synthetic magnetic field of the interior permanent magnet synchronous motor during unidirectional operation, as well as its load torque fluctuation and radial force wave. It is also beneficial for improving the electromagnetic noise excitation of the interior permanent magnet synchronous motor during unidirectional rotation.

[0081] Reference Figures 1 to 9 In one embodiment of the present invention, when the motor is a surface-mounted permanent magnet synchronous motor, the rotor 13 includes:

[0082] Rotor core 131;

[0083] The permanent magnet 132 is disposed on the wall surface of the rotor core 131 facing the stator core 12 .

[0084] In this embodiment, the permanent magnet 132 is provided on the outer peripheral wall of the rotor core 131, that is, the wall of the rotor core 131 facing the stator core 12. In the surface-mounted permanent magnet synchronous motor, except that the position of the permanent magnet is different from that of the built-in permanent magnet synchronous motor, the rest of the structure can refer to the built-in permanent magnet synchronous motor, so it will not be described here. The technical solution of the present invention is beneficial to reducing the harmonic content in the synthetic magnetic field of the surface-mounted permanent magnet synchronous motor during unidirectional operation, as well as its load torque fluctuation and radial force wave, by applying the proposed stator core 131 to the surface-mounted permanent magnet synchronous motor. It is also beneficial to improve the electromagnetic noise excitation of the surface-mounted permanent magnet synchronous motor during unidirectional rotation.

[0085] The present invention further provides a compressor comprising the motor described above. The detailed structure of the motor can be found in the above-described embodiments and will not be further described here. It is understood that since the above-described motor is used in a motor, the embodiments of this motor include all technical solutions of all the above-described motor embodiments and achieve the same technical effects, which will not be further described here.

[0086] In this embodiment, the compressor can be used in equipment with a refrigeration system, such as air conditioners and refrigerators.

[0087] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present description and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A stator core, characterized in that: The stator core includes a stator core unit, and the stator core unit is used for a unidirectional rotating motor, and the stator core unit includes: a stator yoke unit; and A plurality of stator teeth are provided on the stator yoke unit, each of the stator teeth is provided with an auxiliary groove, and a connecting line between the center of each auxiliary groove and the center point of the stator core is a first connecting line, and each of the first connecting lines is offset by a preset angle in the opposite direction of a first rotation direction with the center line of the stator tooth portion where it is located as a reference, and the first rotation direction is the rotation direction of the motor, and the preset angles at which the first connecting lines are offset with the center line of the stator tooth portion where it is located as a reference are different from each other; the preset angles at which the first connecting lines are offset with the center line of the stator tooth portion where it is located as a reference decrease or increase successively in the opposite direction of the first rotation direction; the stator core unit is one or more, and when the stator core unit is multiple, each stator core unit is the same.

2. The stator core according to claim 1, wherein: The preset angle of each first connecting line offset with respect to the center line of the stator tooth portion where it is located is reduced or increased in sequence according to a fixed angle in the opposite direction of the first rotation direction; or reduced or increased in sequence according to a rule of step-by-step angle change.

3. The stator core according to claim 1, wherein: The auxiliary grooves are identical.

4. The stator core according to claim 3, wherein: The radial cross-section of each auxiliary groove is any one of semicircular, rectangular or triangular.

5. The stator core according to claim 1, wherein: The stator core unit is a stator punching unit, or is formed by stacking a plurality of stator punching units.

6. The stator core according to any one of claims 1 to 5, characterized in that: The stator yoke unit is arranged in an arc shape or an annular shape.

7. A motor, characterized in that: The motor includes the stator core according to claim 1 .

8. The motor according to claim 7, characterized in that The motor further comprises a rotor, which is disposed in the stator core; Alternatively, the rotor is arranged outside the stator core.

9. The motor according to claim 8, characterized in that When the motor is a built-in permanent magnet synchronous motor, the rotor includes: rotor core; A mounting groove is provided on the rotor core; A permanent magnet is installed in the installation groove, and the permanent magnet rotates synchronously with the rotor core.

10. The motor according to claim 8, wherein When the motor is a surface-mounted permanent magnet synchronous motor, the rotor includes: rotor core; The permanent magnet is arranged on the wall surface of the rotor core facing the stator core.

11. A compressor, characterized in that: The compressor comprises the motor according to any one of claims 7 to 10.

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