Stator, motor and air conditioner

Abstract

Embodiments of the present application provide a kind of stator, motor and air conditioner.The stator includes annular stator yoke and multiple stator teeth.Multiple stator teeth are connected to the radial side of stator yoke, and are arranged along the circumferential direction of stator yoke.The stator tooth includes tooth body and tooth shoe, and the tooth shoe is connected to the end of tooth body away from the stator yoke in the radial direction.The tooth body includes first side and second side, and the first side and the second side are located on the opposite sides of the tooth body in the circumferential direction.In the vertical projection of the axial direction of the stator yoke, the size of the tooth shoe of at least one stator tooth protruding in the circumferential direction from the first side is greater than the size of the tooth shoe protruding in the circumferential direction from the second side.On the one hand, it helps to reduce the number of magnetic flux lines from the rotor directly through the tooth shoe protruding from the second side to the rotor, and helps to reduce the magnetic flux leakage.On the other hand, it helps to increase the size of the slot formed by the adjacent two tooth shoes in the circumferential direction, helps to increase the magnetic resistance between the adjacent two tooth shoes, and also helps to reduce the magnetic flux leakage.

Description

Technical Field

[0001] This application relates to the field of motor technology, and more particularly to a stator, motor and air conditioner. Background Technology

[0002] Compared with traditional motors, permanent magnet synchronous motors have advantages such as simple structure, high efficiency and good performance, so they are widely used in various fields.

[0003] The magnetic field generated by the stator windings of a permanent magnet synchronous motor interacts with the magnetic field generated by the rotor to provide driving torque for the rotor. However, during operation, some magnetic field lines do not pass through the working magnetic circuit, resulting in magnetic leakage, which affects the motor performance. Summary of the Invention

[0004] In view of this, embodiments of this application aim to provide a stator, motor, and air conditioner that help reduce magnetic leakage.

[0005] In a first aspect, embodiments of this application provide a stator, comprising:

[0006] Circular stator yoke;

[0007] Multiple stator teeth are connected to one radial side of the stator yoke and arranged circumferentially spaced along the stator yoke. Each stator tooth includes a tooth body and a tooth shoe. The tooth shoe is connected to one end of the tooth body radially away from the stator yoke. The tooth body includes a first side and a second side, which are located on opposite sides of the tooth body in the circumferential direction. In orthographic projection onto a plane perpendicular to the axial direction of the stator yoke, the tooth shoe of at least one stator tooth protrudes circumferentially beyond the first side by a greater dimension than it protrudes beyond the second side.

[0008] In some embodiments, the ratio of the dimension by which the toothed boot protrudes circumferentially from the first side to the dimension by which it protrudes circumferentially from the second side is 1.5 to 2.0; and / or, the tooth body has a symmetry center plane, and the ratio of the distance between the end face of the toothed boot protruding circumferentially from the first side to the symmetry center plane to the distance between the end face of the toothed boot protruding circumferentially from the second side to the symmetry center plane is 1.2 to 1.5.

[0009] In some embodiments, the toothed boot has two end faces on opposite sides in the circumferential direction;

[0010] The ratio of the radial dimension of any end face to the circumferential dimension of the tooth body is 0.1 to 0.2.

[0011] In some embodiments, the space between two adjacent stator teeth forms a stator slot, and the space between two adjacent tooth shoes forms a groove, wherein the ratio of the total circumferential dimension of all the grooves to the circumference of the inscribed circle of the tooth shoe is 0.2 to 0.3; and / or, the ratio of the radial dimension of the stator yoke to the circumferential dimension of the tooth body is 0.5 to 0.8.

[0012] In some embodiments, the plurality of stator teeth are connected to the radially inner side of the stator yoke; or, the plurality of stator teeth are connected to the radially outer side of the stator yoke.

[0013] Secondly, embodiments of this application provide an electric motor, including a rotor and a stator as described in any embodiment of this application.

[0014] In some embodiments, the rotor has a forward rotation direction, which is the direction from the second side toward the first side.

[0015] In some embodiments, the rotor includes a rotor core and a plurality of magnets, the rotor core including a plurality of core units, the plurality of core units being arranged at intervals around the rotation axis of the rotor, and a receiving space being defined between each two adjacent core units;

[0016] Multiple magnets are respectively disposed in the corresponding receiving space.

[0017] In some embodiments, the circumferential dimension of the radially outer end face of the magnet is greater than the circumferential dimension of the radially inner end face of the magnet.

[0018] In some embodiments, the magnet has two opposing sidewalls in the circumferential direction, the two sidewalls protruding away from each other.

[0019] In some implementations, the projections of the two sidewalls onto the same virtual ellipse are orthographically projected onto a plane perpendicular to the rotation axis of the rotor.

[0020] In some implementations, the ratio of the major axis to the minor axis of the ellipse is 2.0 to 3.5.

[0021] In some implementations, the outer peripheral surface of the radially outer end of the core unit includes a first arc segment, a second arc segment, and a third arc segment connected sequentially along the circumference of the rotor, wherein the curvature of the first arc segment and the second arc segment are different, and the curvature of the second arc segment and the third arc segment are different.

[0022] In some embodiments, the center of the second arc segment is located on the rotation axis of the rotor;

[0023] The ratio of the central angle corresponding to the second arc segment to the angle between the two adjacent magnets is 0.1 to 0.3; and / or, the first arc segment and the third arc segment are symmetrically arranged about the symmetrical plane of the second arc segment, and the symmetrical plane of the second arc segment passes through the midpoint of the arc length of the second arc segment and the rotation axis of the rotor.

[0024] In some implementations, the ratio of the central angle corresponding to the second arc segment to the central angle corresponding to the first arc segment is 0.3 to 0.5.

[0025] In some embodiments, the minimum circumferential dimension of the core unit along the radial direction of the rotor is not less than 1.0 mm; and / or, the radially outer end of the core unit has protrusions formed on opposite sides in the circumferential direction, the magnet is located radially inside the protrusions, and the protrusions have a circumferential dimension of 0.7 mm to 2.0 mm along the rotor.

[0026] In some embodiments, the rotor includes an injection molded part, the rotor core and the magnet are connected through the injection molded part, the core unit has an injection hole for filling the injection molded part with injection plastic, and the ratio of the distance from the center of the injection hole to the rotation axis of the rotor to the radius of the circumcircle of the rotor core is 0.4 to 0.6.

[0027] Thirdly, embodiments of this application provide an air conditioner, including the motor described in any embodiment of this application.

[0028] The stator provided in this application embodiment has a larger circumferential protrusion of the toothed shoe from the first side than from the second side, meaning the toothed shoe protrudes relatively less from the second side. This helps to reduce the number of magnetic field lines that pass directly from the rotor through the end of the toothed shoe protruding from the second side and back to the rotor, thereby reducing magnetic leakage at the end of the toothed shoe protruding from the second side. On the other hand, it helps to increase the circumferential size of the slot formed by the end of the toothed shoe protruding from the second side and its adjacent toothed shoe, which helps to increase the magnetic resistance between two adjacent toothed shoes, reducing the number of magnetic field lines that pass directly from one toothed shoe through the adjacent toothed shoe and back to the rotor, thus helping to reduce magnetic leakage.

[0029] Furthermore, the toothed shoe also serves as a limiting element for the stator winding. Since the toothed shoe protrudes more circumferentially from the first side than from the second side, meaning the toothed shoe protrudes relatively more circumferentially from the first side, it reduces leakage flux at the end of the toothed shoe protruding from the second side while ensuring that the limiting effect on the stator winding at the end protruding from the first side is not reduced. This helps to ensure the radial limiting effect of the toothed shoe on the stator winding. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the motor provided in an embodiment of this application;

[0031] Figure 2 for Figure 1 A schematic diagram of the stator in the structure shown;

[0032] Figure 3 for Figure 2 A structural diagram of the structure shown from another angle;

[0033] Figure 4 for Figure 3 A schematic diagram of the structure in which the stator yoke is connected to a stator tooth;

[0034] Figure 5 for Figure 1 A schematic diagram of the rotor in the structure shown;

[0035] Figure 6 for Figure 5 A schematic diagram of the core unit in the structure shown;

[0036] Figure 7 for Figure 6 A schematic diagram of a portion of the core unit in the structure shown.

[0037] Figure 8 This is a schematic diagram of the structure of the magnet provided in the embodiments of this application;

[0038] Figure 9 This is a schematic diagram of the magnetic circuit provided for an embodiment of this application.

[0039] Explanation of reference numerals in the attached figures

[0040] 10. Stator; 11. Stator yoke; 12. Stator tooth; 12a. First stator tooth; 12b. Second stator tooth; 121. Tooth body; 1211. First side; 1212. Second side; 122. Tooth shoe; 13. Stator slot; 131. Slot opening; 20. Rotor; 21. Rotor core; 21a. Accommodation space; 211. Core unit; 2111. Radial outer end of core unit; 2112. Protrusion; 2113. Injection hole; 22. Magnet; 221. Radial outer end of magnet; 222. Radial inner end of magnet; 223. Sidewall; 22a. First magnet; 22b. Second magnet; S1. First arc segment; S2. Second arc segment; S3. Third arc segment. Detailed Implementation

[0041] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but should not be used to limit the scope of this application.

[0042] In the description of the embodiments of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0044] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature and the second feature are in direct contact, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0046] It should be noted that, in the embodiments of this application, the radial direction of the stator, the radial direction of the rotor, and the radial direction of the stator yoke all refer to the same direction and are simply referred to as radial. In the embodiments of this application, the circumferential direction of the stator, the circumferential direction of the rotor, and the circumferential direction of the stator yoke all refer to the same direction and are simply referred to as circumferential. In the embodiments of this application, the axial direction of the stator, the axial direction of the rotor, and the direction of the rotor's rotation axis all refer to the same direction and are simply referred to as axial.

[0047] This application provides a stator 10 in an embodiment; please refer to [link / reference]. Figure 2 and Figure 3 The stator 10 includes an annular stator yoke 11 and multiple stator teeth 12.

[0048] Multiple stator teeth 12 are connected to one radial side of the stator yoke 11 and are arranged at intervals along the circumference of the stator yoke 11.

[0049] The positional relationship between the stator teeth 12 and the stator yoke 11 is not limited. In some embodiments, such as... Figure 2 As shown, a plurality of stator teeth 12 are connected to the radially inner side of the stator yoke 11. In this embodiment, the stator 10 is suitable for an inner rotor motor. In some other embodiments, a plurality of stator teeth 12 are connected to the radially outer side of the stator yoke 11. In this embodiment, the stator 10 is suitable for an outer rotor motor.

[0050] Exemplarily, the stator tooth 12 includes a tooth body 121 and a tooth shoe 122, the tooth shoe 122 being connected to one end of the tooth body 121 radially away from the stator yoke 11. That is, the tooth shoe 122 is located on the side of the tooth body 121 closer to the air gap. The tooth shoe 122 forms part of the magnetic circuit, guiding magnetic field lines from the rotor 20 to the stator 10, or from the stator 10 to the rotor 20, i.e., guiding the magnetic field lines through the air gap.

[0051] Please see Figure 3 and Figure 4 The tooth body 121 includes a first side 1211 and a second side 1212, which are located on opposite sides of the tooth body 121 in the circumferential direction.

[0052] In the orthographic projection onto a plane perpendicular to the axial direction of the stator yoke 11, the tooth shoe 122 of at least one stator tooth 12 protrudes beyond the first side 1211 by a dimension k1 greater than the dimension k2 protruding beyond the second side 1212. That is, k1 > k2. In other words, at any cross-section (perpendicular to the axial direction) at any position along the axial direction of the stator yoke 11, k1 > k2. In other words, in the orthographic projection onto a plane perpendicular to the axial direction of the stator yoke 11, the tooth shoe 122 of at least one stator tooth 12 has an asymmetrical structure about the center plane L1 of symmetry of the tooth body 121 in the circumferential direction.

[0053] It should be noted that the center plane of symmetry L1 of the tooth body 121 refers to the plane that divides the tooth body 121 into two identical parts along the circumference. The center plane of symmetry L1 of the tooth body 121 passes through the rotation axis of the rotor 20.

[0054] It should be noted that "at least one" refers to one or more, and "multiple" refers to two, three or more. It can be that the tooth shoe 122 of one stator tooth 12 has an asymmetrical structure, or that the tooth shoes 122 of multiple stator teeth 12 all have an asymmetrical structure.

[0055] For example, please refer to Figure 2 and Figure 3 The space between two adjacent stator teeth 12 forms a stator slot 13, and the space between two adjacent tooth shoes 122 forms a slot 131. Since the dimension of the tooth shoe 122 protruding circumferentially from the first side 1211 is larger than the dimension protruding circumferentially from the second side 1212, i.e., the dimension of the tooth shoe 122 protruding circumferentially from the second side 1212 is relatively smaller, this helps to reduce the number of magnetic field lines that pass directly from the rotor 20 through the end 122b of the tooth shoe 122 protruding from the second side and back to the rotor 20, thus helping to reduce magnetic leakage at the end 122b of the tooth shoe 122 protruding from the second side. On the other hand, it helps to increase the circumferential dimension of the slot 131 formed by the end 122b of the tooth shoe 122 protruding from the second side and its adjacent tooth shoe 122, which helps to increase the magnetic reluctance between two adjacent tooth shoes 122, reducing the number of magnetic field lines that pass directly from one tooth shoe 122 through the adjacent tooth shoe 122 and back to the rotor 20, thus helping to reduce magnetic leakage.

[0056] In some embodiments, the stator 10 includes stator windings. Stator slots 13 are used to house the stator windings.

[0057] For example, the stator winding passes through the stator slot 13 and is wound around the tooth body 121. In this way, the tooth shoe 122 can also limit the stator winding. Since the dimension of the tooth shoe 122 protruding from the first side 1211 in the circumferential direction is larger than the dimension protruding from the second side 1212, that is, the dimension of the tooth shoe 122 protruding from the first side 1211 in the circumferential direction is relatively large, while reducing the leakage magnetic field at the end 122b of the tooth shoe 122 protruding from the second side, the limiting effect of the end 122a protruding from the first side in the circumferential direction on the stator winding is not reduced, which helps to ensure the radial limiting effect of the tooth shoe 122 on the stator winding.

[0058] This application provides an embodiment of a motor. Please refer to [the relevant documentation / reference]. Figure 1 The motor includes a rotor 20 and a stator 10 provided in any embodiment of this application.

[0059] In an embodiment where the stator 10 is adapted for an internal rotor motor, the rotor 20 is rotatably disposed inside the stator 10.

[0060] In an embodiment where the stator 10 is used for an external rotor motor, the rotor 20 is rotatably disposed outside the stator 10, and in this case, the motor is an external rotor motor.

[0061] In an embodiment where the motor is an internal rotor motor, the rotor 20 includes a rotor core 21 and a plurality of magnets 22. The rotor core 21 includes a plurality of core units 211, which are arranged at intervals around the rotation axis of the rotor 20, and a receiving space 21a is defined between each two adjacent core units 211.

[0062] It should be noted that the interval arrangement means that there is a circumferential gap between two adjacent core units 211, and the two adjacent core units 211 do not contact each other.

[0063] Multiple magnets 22 are respectively disposed in corresponding receiving spaces 21a. That is, one receiving space 21a is used to place one magnet 22, and there is a one-to-one mapping relationship between the receiving spaces 21a and the magnets 22. Two adjacent magnets 22 are separated by core units 211, which helps to optimize the magnetic circuit and reduce eddy current losses.

[0064] For example, the rotor 20 has a forward rotation direction, which is the direction from the second side 1212 toward the first side 1211.

[0065] It should be noted that the forward rotation direction of rotor 20 is the direction of rotation of rotor 20 during normal operation of the motor, as indicated on the product nameplate when the motor leaves the factory.

[0066] Please see Figure 1 , Figure 2 and Figure 3 The forward rotation direction provided in this embodiment is the counterclockwise direction on the paper, i.e., the direction indicated by v1 in the figure. That is, for the same stator tooth 12, the first side 1211 is located on the counterclockwise side of the second side 1212.

[0067] For example, the magnet 22 is tangentially magnetized, and the magnetic poles of two adjacent magnets 22 are opposite each other.

[0068] like Figure 1 As shown, for ease of description, one magnet 22 is selected as an example to introduce the main magnetic flux path. This magnet 22 is referred to as the first magnet 22a. Along the forward rotation direction of the rotor 20, the stator tooth 12 located on the side of the magnet 22 facing the forward rotation direction is referred to as the first stator tooth 12a, and the stator tooth 12 located on the side of the magnet 22 facing the opposite direction of the forward rotation direction is referred to as the second stator tooth 12b.

[0069] Along the forward rotation direction of rotor 20, the first stator tooth 12a exerts an attractive force on magnet 22, and the second stator tooth 12b exerts a repulsive force on magnet 22, causing the first magnet 22a to rotate along the forward rotation direction of rotor 20.

[0070] In this embodiment, the first magnet 22a is located within the accommodating space 21a defined by two adjacent core units 211. The first magnet 22a generates the main magnetic flux. The main magnetic flux path is as follows: inside the first magnet 22a, the magnetic field lines point from the S pole to the N pole; outside the first magnet 22a, the magnetic field lines are drawn from the N pole of the first magnet 22a, and pass sequentially through the core unit 211 adjacent to the N pole of the first magnet 22a, the air gap between the rotor 20 and the stator 10, the tooth shoe 122 of the first stator tooth 12a, the tooth body 121 of the first stator tooth 12a, the stator yoke 11, the tooth body 121 of the second stator tooth 12b, the tooth shoe 122 of the second stator tooth 12b, the air gap between the stator 10 and the rotor 20, and the core unit 211 adjacent to the S pole of the first magnet 22a back to the S pole of the first magnet 22a.

[0071] refer to Figure 9 In the E1 part, the magnetic field lines drawn from the N pole of the first magnet 22a pass through the tooth shoe 122 of the first stator tooth 12a and return directly to the S pole of the first magnet 22a. This part does not pass through the main magnetic circuit and is a leakage flux.

[0072] In this embodiment of the application, by reducing the size of the tooth shoe 122 of the first stator tooth 12a protruding from the second side 1212, the number of magnetic field lines that pass through the tooth shoe 122 of the first stator tooth 12a and directly return to the S pole of the magnet 22 can be reduced, which helps to reduce magnetic leakage.

[0073] like Figure 9 As shown, the magnet 22 located on the side of the first magnet 22a opposite to the forward rotation direction of the rotor 20 is designated as the second magnet 22b. The stator tooth 12 located on the side of the second stator tooth 12b opposite to the forward rotation direction of the rotor 20 is designated as the third stator tooth (not shown in the figure).

[0074] At this time, the external main magnetic flux path excited by the second magnet 22b is as follows: magnetic field lines are drawn out from the N pole of the second magnet 22b, and the magnetic field lines pass sequentially through the core unit 211 adjacent to the N pole of the second magnet 22b, the air gap between the rotor 20 and the stator 10, the tooth shoe 122 of the third stator tooth, the tooth body 121 of the third stator tooth, the stator yoke 11, the tooth body 121 of the second stator tooth 12b, the tooth shoe 122 of the second stator tooth 12b, the air gap between the stator 10 and the rotor 20, and the core unit 211 adjacent to the S pole of the magnet 22, returning to the S pole of the magnet 22.

[0075] refer to Figure 9In the E2 part, the magnetic field lines excited by the N pole of the second magnet 22b pass directly through the end 122a of the third stator tooth protruding from the first side and the end 122b of the second stator tooth protruding from the second side, and return to the S pole of the second magnet 22b. This part is called leakage flux.

[0076] In this embodiment, by reducing the size of the toothed shoe 122 protruding from the second side 1212, the circumferential size of the slot 131 is increased, thereby increasing the magnetic resistance between two adjacent toothed shoes 122. This reduces the number of magnetic field lines that pass directly through the end 122a of the third stator tooth protruding from the first side and back to the S pole of the second magnet 22b (that is, it helps to reduce the number of magnetic field lines that pass directly through the toothed shoe 122 of the third stator tooth and back to the S pole of the second magnet 22b), which helps to reduce magnetic leakage.

[0077] In other words, in the embodiment of this application, the size of the toothed shoe 122 protruding from the first side 1211 in the forward rotation direction of the rotor 20 is larger than the size of the toothed shoe 122 protruding from the second side 1212. On the one hand, this makes the size of the toothed shoe 122 protruding from the second side 1212 smaller, reducing the number of magnetic field lines that directly return to the S pole of the magnet 22 through the end 122b of the toothed shoe 122 protruding from the second side, thereby reducing magnetic leakage. On the other hand, this helps to increase the circumferential size of the slot 131, increase the magnetic resistance, and reduce the number of magnetic field lines that directly pass from one toothed shoe 122 through the other toothed shoe 122 back to the S pole of the magnet 22, thereby reducing magnetic leakage.

[0078] In some embodiments, the ratio of the dimension k1 of the toothed shoe 122 protruding circumferentially from the first side 1211 to the dimension k2 of the toothed shoe 122 protruding circumferentially from the second side 1212 is 1.5 to 2.0. That is, 1.5 ≤ k1 / k2 ≤ 2.0, for example, k1 / k2 can be 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, etc. By controlling the ratio of the dimension of the toothed shoe 122 protruding circumferentially from the first side 1211 to the dimension protruding from the second side 1212 within a reasonable range, the degree of reduction of the dimension of the toothed shoe 122 protruding from the second side 1212 is controlled within a reasonable range. At the same time, the leakage magnetic field of the end 122b of the toothed shoe 122 protruding from the second side is reduced, and the end 122b of the toothed shoe 122 protruding from the second side also has a certain guiding effect on the magnetic field and a certain limiting effect on the stator winding.

[0079] It should be noted that k1 refers to the straight-line distance between the point on the end face of the end 122a protruding from the first side 1211 and the first side 1211, for the same stator tooth 12. k2 refers to the straight-line distance between the point on the end face of the end 122b protruding from the second side 1212 and the second side 1212, for the same stator tooth 12.

[0080] In some embodiments, the tooth body 121 has a symmetrical center plane L1, and the ratio of the distance k3 between the end face 122a of the toothed shoe 122 protruding circumferentially from the first side 1211 and the symmetrical center plane L1 to the distance k4 between the end face 122a of the toothed shoe 122 protruding circumferentially from the second side 1212 and the symmetrical center plane L1 is 1.2 to 1.5. That is, 1.2 ≤ k3 / k4 ≤ 1.5. For example, k3 / k4 can be 1.2, 1.3, 1.4, 1.5, etc. This helps to control the size of the end of the toothed shoe 122 protruding circumferentially from the second side 1212 within a reasonable range, that is, to control the degree of reduction of the size of the toothed shoe 122 protruding from the second side 1212 within a reasonable range.

[0081] It should be noted that k3 refers to the straight-line distance between the point on the end face of the end 122a protruding from the first side 1211 that is farthest from the center plane L1 and the center plane L1, for the same stator tooth 12. k4 refers to the straight-line distance between the point on the end face of the end 122b protruding from the second side 1212 that is farthest from the center plane L1 and the center plane L1, for the same stator tooth 12.

[0082] In some embodiments, the toothed shoe 122 has two end faces on opposite sides in the circumferential direction. One end face is the end face of the toothed shoe 122 that protrudes circumferentially from one end 122a of the first side 1211, and the other end face is the end face of the toothed shoe 122 that protrudes circumferentially from one end 122b of the second side 1212.

[0083] For example, the ratio of the radial dimension h2 of any end face to the circumferential dimension w1 of the tooth body 121 is 0.1 to 0.2. That is, 0.1 ≤ h2 / w1 ≤ 0.2. For example, h2 / w1 can be 0.1, 0.2, etc. In this way, the radial dimension h2 of the end faces on opposite sides of the tooth shoe 122 in the circumferential direction is controlled within a reasonable range, so that the number of magnetic field lines that the tooth shoe 122 can guide is within a reasonable range, thereby helping to ensure that the main magnetic flux is within a reasonable range.

[0084] For example, along the direction from the second side 1212 toward the first side 1211, the radial dimension of the end 122a of the toothed shoe 122 protruding from the first side 1211 decreases circumferentially. Along the direction from the first side 1211 toward the second side 1212, the radial dimension of the end 122b of the toothed shoe 122 protruding from the second side 1212 decreases circumferentially.

[0085] In some embodiments, the ratio of the total circumferential dimension of all the slots 131 to the circumference of the inscribed circle G1 of the toothed shoe 122 is 0.2 to 0.3. By limiting the total circumferential dimension of all the slots 131, it is helpful to limit the circumferential dimension of the individual slots 131, thereby helping to control the dimension of the toothed shoe 122 protruding from the second side 1212 within a reasonable range.

[0086] For example, the number of stator teeth 12 is set to n, the circumferential dimension of a single slot 131 is c1, and the total circumferential dimension of all slots 131 is n*c1.

[0087] like Figure 3 As shown, the diameter of the inscribed circle G1 of the toothed shoe 122 is D1, that is, the circumference of the inscribed circle G1 is Π*D1. Therefore, 0.2 ≤ (n*c1) / (Π*D1) ≤ 0.3. For example, (n*c1) / (Π*D1) can take values ​​such as 0.2, 0.3, etc.

[0088] In some embodiments, the ratio of the radial dimension h1 of the stator yoke 11 to the circumferential dimension w1 of the tooth body 121 is 0.5 to 0.8. That is, 0.5 ≤ h1 / w1 ≤ 0.8. For example, h1 / w1 can be 0.5, 0.6, 0.7, 0.8, etc. In this embodiment, such as... Figure 9 As shown, a portion of the magnetic field lines passing through the same tooth body 121 pass through the stator yoke 11 along the direction from the second side 1212 toward the first side 1211, and a portion passes through the stator yoke 11 along the direction from the first side 1211 toward the second side 1212. By controlling the ratio of the radial dimension of the stator yoke 11 to the circumferential dimension of the tooth body 121 within a reasonable range, the total number of magnetic field lines passing through the stator yoke 11 located on opposite sides of the same tooth body 121 is not less than the number of magnetic field lines passing through the tooth body 121, thereby helping to ensure that the main magnetic flux is within a reasonable range.

[0089] For example, the circumferential dimension of the end face of the radially outer end 221 of the magnet 22 is larger than the circumferential dimension of the end face of the radially inner end 222 of the magnet 22. This makes the dimension of the end of the magnet 22 radially closer to the air gap larger than the dimension of the end of the magnet 22 radially farther from the air gap, allowing more magnetic field lines to reach the stator 10 through a shorter magnetic path, thus helping to improve the transmission efficiency of the magnetic field lines.

[0090] In some embodiments, such as Figure 8 As shown, the magnet 22 has two opposing sidewalls 223 in the circumferential direction, and the two sidewalls 223 protrude in a direction away from each other. In this way, in the case of the same radius of the rotor core 21, it helps to increase the circumferential dimension of the magnet 22, increase the volume of the magnet 22, and help to increase the number of magnetic field lines of the magnet 22.

[0091] For example, when projected onto a plane perpendicular to the rotation axis of rotor 20, the projections of the two sidewalls 223 lie on the same virtual ellipse.

[0092] For example, the ratio of the major axis a to the minor axis b of the ellipse is 2.0 to 3.5, that is, 2.0 ≤ a / b ≤ 3.5. For example, a / b can take values ​​such as 2.0, 2.2, 2.4, 2.5, 2.8, 3.0, 3.1, 3.4, 3.5, etc. By controlling the ratio of the major axis a to the minor axis b of the ellipse within a reasonable range, the degree to which the two sidewalls 223 protrude away from each other is within a reasonable range. This ensures that the circumferential dimensions of the magnet 22 are within a reasonable range, and also ensures that the circumferential dimensions of the core unit 211 between two adjacent magnets 22 are within a reasonable range.

[0093] In some embodiments, the radial inner end 222 of the magnet 22 is formed with a fillet 222a.

[0094] For example, the ratio of the radius r1 of the fillet 222a to the minor axis b is 0.2 to 0.4. For example, 0.2 ≤ r1 / b ≤ 0.4. For example, r1 / b can be 0.2, 0.3, 0.4, etc. By controlling the radius r1 of the fillet 222a within a reasonable range, it helps to ensure the circumferential dimension of the radial inner end 222 of the magnet 22.

[0095] In some embodiments, the outer peripheral surface of the radial outer end 2111 of the core unit includes a first arc segment S1, a second arc segment S2, and a third arc segment S3 connected sequentially along the circumference of the rotor 20. By designing the end face of the radial outer end 2111 of the core unit as an arc segment, it helps to optimize the air gap magnetic field distribution between the stator 10 and the rotor 20, making the air gap magnetic field closer to the ideal sine waveform, which helps to reduce the harmonic content of the motor and reduce the torque ripple of the motor.

[0096] For example, the curvatures of the first arc segment S1 and the second arc segment S2 are different, and the curvatures of the second arc segment S2 and the third arc segment S3 are different. That is, the first arc segment S1, the second arc segment S2, and the third arc segment S3 do not belong to the same circumference of the arc, which helps to further optimize the air gap magnetic field distribution between the stator 10 and the rotor 20, thereby further reducing the harmonic content of the motor.

[0097] In some embodiments, the center of the second arc segment S2 is located on the rotation axis of the rotor 20. That is, the second arc segment S2 is concentric with the rotation axis of the rotor 20.

[0098] For example, the ratio of the central angle θ2 corresponding to the second arc segment S2 to the angle β between the two adjacent magnets 22 is 0.1 to 0.3. That is, 0.1 ≤ θ2 / β ≤ 0.3. For example, θ2 / β can take values ​​of 0.1, 0.2, 0.3, etc.

[0099] It should be noted that the magnet 22 has a plane of symmetry. The plane of symmetry of the magnet 22 passes through the axis of rotation and is used to divide the magnet 22 into two identical parts. The included angle β between two adjacent magnets 22 refers to the included angle between the planes of symmetry of two adjacent magnets 22.

[0100] In this embodiment, given the limited size of the rotor core 21, by limiting the ratio of the central angle corresponding to the second arc segment S2 to the angle between the two adjacent magnets 22, the ratio of the arc length of the second arc segment S2 to the circumferential distance between the two adjacent magnets 22 is kept within a reasonable range, which helps to further optimize the magnetic circuit structure and reduce the harmonic content.

[0101] For example, the first arc segment S1 and the third arc segment S3 are symmetrically arranged about the symmetrical plane of the second arc segment S2, and the symmetrical plane of the second arc segment S2 passes through the midpoint of the arc length of the second arc segment S2 and the rotation axis of the rotor 20.

[0102] In some embodiments, the ratio of the central angle θ2 corresponding to the second arc segment S2 to the central angle θ1 corresponding to the first arc segment S1 is 0.3 to 0.5. That is, 0.3 ≤ θ2 / θ1 ≤ 0.5. For example, θ2 / θ1 can take values ​​of 0.3, 0.4, 0.5, etc. This ensures that the ratio of the arc length of the second arc segment S2 to the arc length of the first arc segment S1 is within a reasonable range, which helps to further optimize the magnetic circuit structure and reduce harmonic content.

[0103] In some embodiments, the minimum circumferential dimension w2 of the core unit 211 along the radial direction of the rotor 20 is not less than 1.0 mm (millimeter). That is, w2 ≥ 1.0 mm. By controlling the minimum dimension of the core unit 211, it is helpful to ensure the structural strength of the core unit 211.

[0104] In some embodiments, the radially outer end 2111 of the core unit 211 has protrusions 2112 formed on opposite sides in the circumferential direction, and the magnet 22 is located radially inside the protrusions 2112. The protrusions 2112 are used to limit the radially outer end 221 of the magnet in the radial direction of the rotor 20, so that the magnet 22 is relatively stably located within the receiving space 21a.

[0105] For example, the circumferential dimension w3 of the protrusion 2112 along the rotor 20 is 0.7mm to 2.0mm. That is, 0.7mm ≤ w3 ≤ 2.0mm. For example, w3 can be 0.7mm, 0.8mm, 1.0mm, 1.5mm, 1.8mm, 2.0mm, etc. By controlling the circumferential dimension of the protrusion 2112 within a reasonable range, on the one hand, the protrusion 2112 has a certain size in the circumferential direction to limit the radial outer end 221 of the magnet 22; on the other hand, it also helps to avoid the two protrusions 2112 from being too long in the circumferential direction, which would cause the two protrusions 2112 to contact and generate magnetic leakage.

[0106] In some embodiments, the rotor 20 includes an injection-molded part, and the rotor core 21 and magnet 22 are connected through the injection-molded part.

[0107] For example, the rotor core 21 and magnet 22 can be placed into a mold, and then the injection molding material of the injection molded part can be injected into the mold. The injection molding material of the injection molded part covers the outside of the rotor core 21 and also fills the gap area between the magnet 22 and the core unit 211111. After cooling and molding, the magnet 22 and the core unit 211 are connected through the injection molded part, and the injection molded part serves as the appearance part of the rotor 20.

[0108] For example, the core unit 211 has an injection hole 2113 for filling the injection molded part with the injection molding material. This facilitates increasing the bonding force between the injection molded part and the core unit 211.

[0109] For example, the ratio of the distance d1 from the center of the injection hole 2113 to the rotation axis of the rotor 20 to the radius (D2 / 2) of the circumcircle G2 of the rotor core 21 is 0.4 to 0.6. That is, 0.4 ≤ d1 / (D2 / 2) ≤ 0.6. For example, d1 / (D2 / 2) can be 0.4, 0.5, 0.6, etc. In this way, the distance from the center of the injection hole 2113 to the rotation axis of the rotor 20 is within a reasonable range, and the position of the injection hole 2113 is in a reasonable position in the core unit 211, which helps to avoid the injection hole 2113 being too close to the rotation axis of the rotor 20.

[0110] Please see Figure 7 As the core unit 211 is radially closer to the rotation axis of the rotor 20, its circumferential dimension is reduced. By controlling the distance between the injection hole 2113 and the rotation axis of the rotor 20 within a reasonable range, the injection hole 2113 is prevented from occupying too large a portion of the core unit 211 in the circumferential direction, which would make it difficult for magnetic field lines to pass through the part of the core unit 211 where the injection hole 2113 is located. This helps to increase the magnetic flux of the core unit 211.

[0111] This application also provides an air conditioner, which includes the motor provided in any embodiment of this application. That is, the motor provided in this application can be applied to an air conditioner.

[0112] Motors can be used in outdoor units of air conditioners, as well as indoor cabinet or wall-mounted units. Given the limited size of the motor, reducing leakage flux and increasing main flux helps to increase torque, which in turn facilitates miniaturization of the motor. The limited internal space of air conditioners makes overall motor miniaturization particularly important.

[0113] The various embodiments / implementations provided in this application can be combined with each other without creating contradictions.

[0114] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A stator, characterized in that, include: Circular stator yoke; Multiple stator teeth are connected to one radial side of the stator yoke and arranged circumferentially spaced along the stator yoke. Each stator tooth includes a tooth body and a tooth shoe. The tooth shoe is connected to one end of the tooth body radially away from the stator yoke. The tooth body includes a first side and a second side, which are located on opposite sides of the tooth body in the circumferential direction. In orthographic projection onto a plane perpendicular to the axial direction of the stator yoke, the tooth shoe of at least one stator tooth protrudes circumferentially beyond the first side by a greater dimension than it protrudes beyond the second side.

2. The stator according to claim 1, characterized in that, The ratio of the dimension by which the toothed boot protrudes circumferentially from the first side to the dimension by which it protrudes circumferentially from the second side is 1.5 to 2.0; and / or, the tooth body has a symmetrical center plane, and the ratio of the distance between the end face of the toothed boot protruding circumferentially from the first side to the symmetrical center plane to the distance between the end face of the toothed boot protruding circumferentially from the second side to the symmetrical center plane is 1.2 to 1.

5.

3. The stator according to claim 1, characterized in that, The toothed boot has two end faces on opposite sides in the circumferential direction; The ratio of the radial dimension of any end face to the circumferential dimension of the tooth body is 0.1 to 0.

2.

4. The stator according to claim 1, characterized in that, The space between two adjacent stator teeth forms a stator slot, and the space between two adjacent tooth shoes forms a groove. The ratio of the total circumferential dimension of all the grooves to the circumference of the inscribed circle of the tooth shoe is 0.2 to 0.3; and / or, the ratio of the radial dimension of the stator yoke to the circumferential dimension of the tooth body is 0.5 to 0.

8.

5. The stator according to any one of claims 1-4, characterized in that, The plurality of stator teeth are connected to the radially inner side of the stator yoke; or, the plurality of stator teeth are connected to the radially outer side of the stator yoke.

6. An electric motor, characterized in that, It includes the rotor and the stator as described in any one of claims 1-5.

7. The motor according to claim 6, characterized in that, The rotor has a forward rotation direction, which is the direction from the second side toward the first side.

8. The motor according to claim 6, characterized in that, The rotor includes a rotor core and multiple magnets. The rotor core includes multiple core units, which are arranged at intervals around the rotation axis of the rotor. A receiving space is defined between each pair of adjacent core units. Multiple magnets are respectively disposed in the corresponding receiving space.

9. The motor according to claim 8, characterized in that, The circumferential dimension of the outer radial end face of the magnet is greater than the circumferential dimension of the inner radial end face of the magnet.

10. The motor according to claim 9, characterized in that, The magnet has two opposing sidewalls in the circumferential direction, and the two sidewalls protrude in a direction away from each other.

11. The motor according to claim 10, characterized in that, The projections of the two sidewalls onto the same virtual ellipse are obtained by orthographic projection onto a plane perpendicular to the rotation axis of the rotor.

12. The motor according to claim 11, characterized in that, The ratio of the major axis to the minor axis of the ellipse is 2.0 to 3.

5.

13. The motor according to claim 8, characterized in that, The outer peripheral surface of the radial outer end of the core unit includes a first arc segment, a second arc segment, and a third arc segment connected sequentially along the circumference of the rotor. The curvatures of the first arc segment and the second arc segment are different, and the curvatures of the second arc segment and the third arc segment are different.

14. The motor according to claim 13, characterized in that, The center of the second arc segment is located on the rotation axis of the rotor; The ratio of the central angle corresponding to the second arc segment to the angle between the two adjacent magnets is 0.1 to 0.3; and / or, the first arc segment and the third arc segment are symmetrically arranged about the symmetrical plane of the second arc segment, and the symmetrical plane of the second arc segment passes through the midpoint of the arc length of the second arc segment and the rotation axis of the rotor.

15. The motor according to claim 14, characterized in that, The ratio of the central angle corresponding to the second arc segment to the central angle corresponding to the first arc segment is 0.3 to 0.

5.

16. The motor according to claim 8, characterized in that, Along the radial direction of the rotor, the minimum circumferential dimension of the core unit is not less than 1.0 mm; and / or, the radial outer end of the core unit has protrusions formed on opposite sides in the circumferential direction, the magnet is located radially inside the protrusions, and the protrusions have a circumferential dimension of 0.7 mm to 2.0 mm along the rotor.

17. The motor according to claim 8, characterized in that, The rotor includes an injection molded part, the rotor core and the magnet are connected through the injection molded part, the core unit has an injection hole, the injection hole is used to fill the injection plastic of the injection molded part, and the ratio of the distance from the center of the injection hole to the rotation axis of the rotor to the radius of the circumcircle of the rotor core is 0.4 to 0.

6.

18. An air conditioner, characterized in that, Includes the motor as described in any one of claims 6-17.

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