Motor and household appliance

Abstract

The utility model discloses a motor and a household electrical appliance, and relates to the technical field of motors, and the motor comprises a rotor assembly, a stator assembly and an insulation sheet. The rotor assembly comprises a rotor iron core, the stator assembly comprises a stator iron core, the maximum outer diameter of the stator iron core is D1, the minimum inner diameter of the stator iron core is D2, the maximum thickness of stator punching sheets which are laminated to form the stator iron core is t1, the minimum inner diameter of the rotor iron core is D3, the minimum inner diameter of the rotor iron core is D4, and the maximum thickness of rotor punching sheets which are laminated to form the rotor iron core is t2, the thickness of the insulating sheet is d, and [(D3-D4) * t2] / [(D1-D2) * t1 * d] is limited in a range of 4-40, so that the space between the stator assembly and the rotor assembly can be reasonably distributed, the balance between an electric load and a magnetic load and the balance between iron loss and copper loss are realized, and the motor can obtain better performance.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor and a household appliance. Background Art

[0002] The motor generally includes a rotor assembly and a stator assembly. Due to the development trend of miniaturization and high power of motors, in order to increase the winding slot area of ​​the stator assembly, the motor in the related art uses insulating paper instead of the plug-in wall of the insulating frame, so that the stator assembly can accommodate more turns of windings. However, when the number of turns of the winding increases, it is necessary to provide a rotor assembly that is compatible with the stator assembly. Therefore, when the external dimensions of the motor remain unchanged, the space allocation of the rotor assembly and the stator assembly is closely related to the performance of the motor. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a motor that can reasonably allocate the space between the stator assembly and the rotor assembly so that the motor can obtain better performance.

[0004] The utility model also provides a household appliance with the motor.

[0005] According to the first aspect of the utility model, the motor comprises: a rotor assembly, which rotates around a rotation axis, wherein the rotor assembly comprises a rotor core and a plurality of permanent magnets, wherein the rotor core comprises a plurality of core units arranged around the rotation axis, and mounting grooves are formed between adjacent core units, and the plurality of permanent magnets are respectively mounted in the corresponding mounting grooves; a stator assembly, comprising a stator core, and two insulating frames connected to the stator core at both ends of the rotation axis, wherein the stator core comprises a yoke and a plurality of stator teeth, wherein the yoke is arranged around the outside of the rotor assembly, and the plurality of stator teeth are arranged around the inside of the yoke and are spaced apart along the circumference of the rotor assembly; and along the circumference, adjacent A winding slot is formed between two stator teeth; an insulating sheet, along the direction of the rotation axis, the two ends of the insulating sheet are respectively connected to the two insulating frames, the insulating sheet is arranged around the inner side of the winding slot, and the thickness of the insulating sheet is d; the stator core includes a plurality of stator punchings stacked along the direction of the rotation axis, and the maximum thickness of the stator punchings is t1; the core unit includes a plurality of rotor punchings stacked along the direction of the rotation axis, and the maximum thickness of the rotor punchings is t2; the maximum outer diameter of the stator core is D1, and the minimum inner diameter of the stator core is D2; the maximum outer diameter of the rotor core is D3, and the minimum inner diameter of the rotor core is D4; satisfying:

[0006]

[0007] The motor according to the embodiment of the utility model has at least the following beneficial effects:

[0008] By defining the thickness of the insulating sheet as d, the maximum outer diameter of the stator core as D1, the minimum inner diameter of the stator core as D2, the maximum thickness of the stator punching sheets stacked to form the stator core as t1, the minimum inner diameter of the rotor core as D3, the minimum inner diameter of the rotor core as D4, and the maximum thickness of the rotor punching sheets stacked to form the rotor core as t2, however, the value of [(D3-D4)*t2] / [(D1–D2)*t1*d] is directly related to the magnetic load and electric load of the motor, as well as the iron loss and copper loss. Therefore, limiting the above parameters to the range of 4 to 40 can reasonably allocate the space between the stator assembly and the rotor assembly, achieve a balance between the electric load and the magnetic load, as well as a balance between the iron loss and the copper loss, so that the motor can obtain better performance.

[0009] According to some embodiments of the present invention, the stator tooth comprises a tooth portion and a tooth top, one end of the tooth portion is connected to the yoke portion, and the other end is connected to the tooth top, and the maximum width of the tooth portion is W. t ,satisfy:

[0010]

[0011] According to some embodiments of the utility model, at least one end of the stator core is provided with a sink groove along the direction of the rotation axis, the sink groove is located at the end of the winding groove and arranged around the inner side of the winding groove, and the insulating frame is fixedly connected to the sink groove.

[0012] According to some embodiments of the utility model, the insulating frame includes a base and a wall connected to a portion of the outer edge of the base, the base is connected to the end of the stator core, the wall is disposed in the sink, and the insulating sheet is fixedly connected to the wall.

[0013] According to some embodiments of the present invention, along the radial direction of the rotor assembly, the minimum width of the mounting groove at one end away from the rotation axis is so1, and the minimum width of the mounting groove at one end close to the rotation axis is so2, satisfying: 0.5≤so1 / W mag ≤0.6, and 0.5≤so2 / W mag ≤0.6.

[0014] According to some embodiments of the present invention, a minimum width so1 of the mounting groove at one end away from the rotation axis and a minimum width so2 of the mounting groove at one end close to the rotation axis satisfy: 0.9≤so1 / so2≤1.

[0015] According to some embodiments of the present invention, the rotor assembly further includes a molded part, which fills a side of the mounting groove close to the rotation axis, a side of the mounting groove away from the rotation axis, and a gap between the permanent magnet and the mounting groove along the radial direction of the rotor assembly.

[0016] According to some embodiments of the present invention, the rotor assembly further includes a rotating shaft, which is disposed in the enclosed space of the plurality of core units, and the overmolded component further fills the space between the rotating shaft and the plurality of core units.

[0017] According to some embodiments of the present invention, the core unit is further provided with an injection hole extending in the direction of the rotation axis, and the overmolded part is also filled in the injection hole.

[0018] The household appliance according to the embodiment of the second aspect of the utility model comprises the motor described in the above embodiment.

[0019] The household appliance according to the embodiment of the utility model has at least the following beneficial effects:

[0020] The motor adopts the first aspect embodiment, and the motor defines the thickness of the insulating sheet as d, the maximum outer diameter of the stator core as D1, the minimum inner diameter of the stator core as D2, the maximum thickness of the stator punchings stacked to form the stator core as t1, the minimum inner diameter of the rotor core as D3, the minimum inner diameter of the rotor core as D4, and the maximum thickness of the rotor punchings stacked to form the rotor core as t2. However, the value of [(D3-D4)*t2] / [(D1–D2)*t1*d] is directly related to the magnetic load and electric load of the motor, as well as the iron loss and copper loss. Therefore, limiting the above parameters to the range of 4 to 40 can reasonably allocate the space between the stator assembly and the rotor assembly, achieve a balance between the electric load and the magnetic load, and a balance between the iron loss and the copper loss, so that the motor can obtain better performance.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a motor according to an embodiment of the utility model;

[0024] Figure 2 for Figure 1 A simplified schematic diagram of the motor shown;

[0025] Figure 3for Figure 1 A partial enlarged view of the structure of the stator core;

[0026] Figure 4 for Figure 1 The structural diagram of the stator core in the initial state;

[0027] Figure 5 This is a schematic structural diagram of a stator assembly of an embodiment of the utility model, wherein the winding is not shown;

[0028] Figure 6 for Figure 5 An exploded view of the stator assembly is shown;

[0029] Figure 7 An exploded view of a stator assembly of another embodiment of the utility model;

[0030] Figure 8 A cross-sectional view of a stator assembly according to another embodiment of the present invention;

[0031] Fig. 9 for Figure 1 An enlarged view of the structure of the middle rotor assembly;

[0032] Fig.10 for Fig. 9 An enlarged view of a portion of the rotor assembly is shown, showing two core units and permanent magnets;

[0033] Fig.11 for Fig. 9 An enlarged view of a portion of the rotor assembly is shown, showing two core units.

[0034] Figure Number:

[0035] stator assembly 100; stator core 110; yoke 111; stator teeth 112; tooth portion 113; first side wall 1131; second side wall 1132; tooth top 114; protrusion 115; groove 116; welding feature 117; positioning hole 119; insulation frame 120; base 121; wall 122; first insulation frame 127; second insulation frame 128; positioning column 129; winding groove 130; first notch 131; sink 140; winding 150;

[0036] Rotor assembly 200; rotor core 210; core unit 211; first protrusion 212; second protrusion 213; second notch 214; third notch 215; injection hole 216; permanent magnet 220; mounting groove 230; overmolded part 240; rotating shaft 250;

[0037] Insulation sheet 300;

[0038] Axis of rotation O. DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In the description of the present utility model, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0042] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0043] Motors are important components in household appliances, for example, motors used to drive the fan of air conditioners, motor components inside compressors, motors for washing machines, motors for dishwashers, etc. With the development of the household appliance industry, miniaturization and high power have become the development direction of the new generation of motors.

[0044] The motor generally includes a stator assembly and a rotor assembly, wherein the rotor assembly rotates around the rotation axis of the motor, and the stator assembly is arranged around the rotation axis. Under the action of the electromagnetic field, the rotor assembly can rotate relative to the stator assembly, thereby driving the load connected to the output end of the motor to rotate. It can be understood that in one embodiment, the stator assembly is configured to be arranged around the outer side of the rotor assembly, which is an inner rotor motor; in another embodiment, the stator assembly is configured to be arranged around the inner side of the rotor assembly, which is an outer rotor motor.

[0045] In order to facilitate understanding of the solutions of the embodiments of the present utility model, the following description is given by taking an inner rotor motor as an example.

[0046] Reference Figure 1 and Figure 2As shown, the motor of the present utility model embodiment includes a stator assembly 100 and a rotor assembly 200. The rotor assembly 200 includes a rotating shaft 250. The central axis of the rotating shaft 250 coincides with the rotation axis O of the motor. The stator assembly 100 is arranged around the outer side of the rotor assembly 200. In order to improve the stability and reliability of the motor, the rotor assembly 200 and the stator assembly 100 are generally respectively coated with plastic before being assembled. Figure 2 and Fig. 9 As shown, the rotor assembly 200 includes a rotor core 210, a plurality of permanent magnets 220 and a rotating shaft 250. The rotor core 210 is provided with a plurality of mounting grooves 230. The plurality of permanent magnets 220 are mounted in the corresponding mounting grooves 230 one by one. The rotating shaft 250 is mounted inside the rotor core 210. The assembled rotor core 210, the plurality of permanent magnets 220 and the rotating shaft 250 are connected by an integral injection molding process, which is the overmolding process of the rotor assembly 200. Figure 5 and Figure 6 As shown, the stator assembly 100 includes a stator core 110, an insulating frame 120 and a winding 150. The assembled stator core 110, the insulating frame 120 and the winding 150 are connected by an integrated injection molding process, which is the overmolding treatment of the stator assembly 100. It should be noted that the overmolding treatment of the stator assembly 100 generally forms a partial housing of the motor at the same time, so as to facilitate rapid assembly with the rotor assembly 200; it can also directly form a base for installing the motor. After the overmolding treatment, both the rotor assembly 200 and the stator assembly 100 can obtain a more stable structure, so that the internal components are not easily separated, and the connection stability between the components is improved.

[0047] Reference Figure 2 and Figure 3 As shown, the motor of the embodiment of the utility model, wherein the stator core 110 is arranged along the circumferential direction of the rotation axis O. The stator core 110 includes a yoke 111 and a plurality of stator teeth 112, the yoke 111 is arranged around the outer side of the rotor assembly 200, and the plurality of stator teeth 112 are arranged around the inner side of the yoke 111, and the plurality of stator teeth 112 are arranged at intervals along the circumferential direction, and along the radial direction of the stator core 110, the plurality of stator teeth 112 are arranged at intervals from the rotor assembly 200 on the side facing away from the yoke 111. Each stator tooth 112 includes a tooth portion 113 and a tooth top 114, one end of each tooth portion 113 is connected to the yoke 111, and the other end of each tooth portion 113 is connected to the tooth top 114, and the tooth top 114 is arranged at intervals from the rotor assembly 200. Referring to Figure 2As shown, an air gap is formed between the tooth top 114 and the rotor assembly 200, and the air gap is a non-uniform air gap along the circumferential direction, thereby improving the performance of the motor. In order to achieve a non-uniform air gap, a motor of an embodiment of the utility model sets the outer contour of the rotor core 210 to a multi-segment line; or sets the outer contour of the rotor core 210 to an arc whose center does not coincide with the rotation axis O. As an alternative embodiment, the motor can also set the gap between each tooth top 114 and the rotor assembly 200 to be different; or set the inner contour of at least one tooth top 114 facing the side of the rotor assembly 200 to a multi-segment line or an arc whose center does not coincide with the rotation axis O, so that the gap between the tooth top 114 and the rotor assembly 200 is different in the circumferential direction.

[0048] Reference Figure 2 and Figure 3 As shown, the stator core 110 is provided with a plurality of winding slots 130, and the plurality of winding slots 130 are arranged at intervals along the circumferential direction of the rotation axis O, and the winding slots 130 are formed between adjacent stator teeth 112. Each winding slot 130 is formed by enclosing two adjacent stator teeth 112 and a partial structure of the yoke 111 connected between the two stator teeth 112. Two circumferentially adjacent stator teeth 112 are provided with a gap on a side close to the rotor assembly 200, and the gap is formed as a first notch 131 of the winding slot 130. The provision of the first notch 131 is conducive to the winding 150 being wound around the stator teeth 112. It can be understood that the stator core 110 of the embodiment of the utility model adopts a linearly arranged structure (such as Figure 4 The strip-shaped stator core 110 shown in FIG. 1 is used to make the winding slot 130 between the two stator teeth 112 open in the initial state, that is, the first notch 131 of the winding slot 130 is opened, so that the enameled wire can enter the winding slot 130 during winding, which is beneficial to improving the winding efficiency. After the stator core 110 is wound, the stator core 110 in the initial state is synthesized into a full circle (that is, the annular stator core 110, as shown in FIG. 1 ). Figure 5 As shown), and the installation method of this embodiment does not require the reserved width of the winding needle, and can maximize the use of limited space to wind more enameled wires, improve the slot fill rate, and thus achieve the goal of high-power miniaturization of the motor.

[0049] Reference Figure 4As shown, the stator assembly 100 of the embodiment of the utility model adopts a linear arrangement and then rounded assembly method. The stator core 110 has a bending portion or a chain-type matching portion in the middle position of the two stator teeth 112. The bending portion or the chain-type matching portion can be arranged on the yoke 111 between the two stator teeth 112. During assembly, the stator core 110 in a bar state can be bent into a stator core 110 in a full circle state by bending the bending portion or the chain-type matching portion. Therefore, the bending portion or the chain-type matching portion can ensure the accuracy of the relative position of the two stator teeth 112 after rotation and the integrity of the connection.

[0050] Reference Figure 4 As shown, the stator core 110 in the bar state has a protrusion 115 on one side along the length direction and a groove 116 on the other side. The protrusion 115 and the groove 116 can fit tightly after the stator core 110 is rounded. The stator core 110 is positioned in a closed circle by the cooperation of the protrusion 115 and the groove 116, ensuring the accuracy of the relative position of the first and last two stator teeth 112 of the stator core 110 along the length direction. In the embodiment of the utility model, the outer contour of the protrusion 115 is a cylindrical surface, and the inner contour of the groove 116 is a cylindrical surface that cooperates with the protrusion 115.

[0051] Reference Figure 4 As shown, in order to ensure the overall stability of the stator core 110 after the rounding, the stator core 110 in the bar state has welding features 117 on both sides along the length direction. The welding features 117 are generally protrusions 115 structures, which are used to improve the stability of the welding when the two ends of the stator core 110 need to be welded during the rounding process.

[0052] Reference Figure 4 and Figure 5 As shown, the insulating frame 120 of the motor of the embodiment of the utility model has various structural forms. The insulating frame 120 of the first embodiment of the utility model is configured to be composed of a plurality of independent and detachable first insulating frames 127, and a plurality of independent and detachable second insulating frames 128. Along the direction of the rotation axis O, the upper end and the lower end of each stator tooth 112 are respectively installed with the first insulating frame 127 and the second insulating frame 128, the upper end of the stator core 110 is installed with a plurality of first insulating frames 127 that are circumferentially enclosed in a circle, and the lower end of the stator core 110 is installed with a plurality of second insulating frames 128 that are enclosed in a circle.

[0053] In addition, the insulating frame 120 of the second embodiment of the utility model is configured to be composed of a plurality of independent third insulating frames arranged in sequence along the circumferential direction. Each third insulating frame includes two insulating portions connected to the upper end and the lower end of the same stator tooth 112, and a connecting portion connecting the two insulating portions. A third insulating frame is installed corresponding to each stator tooth 112. For example, the third insulating frame of this embodiment includes the first insulating frame 127 and the second insulating frame 128 of the above-mentioned embodiment, and a connecting portion connecting the first insulating frame 127 and the second insulating frame 128.

[0054] As an alternative embodiment, the insulating frame 120 of the third embodiment of the utility model is configured to be composed of a fourth insulating frame and a fifth insulating frame of two integral structures. For example, the fourth insulating frame of this embodiment includes an integral structure of multiple first insulating frames 127 in the above embodiment, and the fifth insulating frame includes an integral structure of multiple second insulating frames 128 in the above embodiment. Along the direction of the rotation axis O, the upper end of the stator core 110 is installed with the fourth insulating frame of the integral structure, and the lower end of the stator core 110 is installed with the fifth insulating frame of the integral structure.

[0055] In order to facilitate understanding of the solutions of the embodiments of the present utility model, the following description is given by taking the first insulating frame 127 and the second insulating frame 128 of the first embodiment as an example.

[0056] Reference Figure 7 As shown, the first insulating frame 127 is connected to the upper end of the stator core 110, covering the upper end surface of the corresponding stator teeth 112 and the partial structure of the yoke 111 on both sides of the stator teeth 112; the second insulating frame 128 is connected to the lower end of the stator core 110, covering the corresponding stator teeth 112 and the lower end surface of the partial structure of the yoke 111 on both sides of the stator teeth 112. The partial structure of the first insulating frame 127 and the second insulating frame 128 extends into the winding groove 130 by a certain distance (for example, 1mm, 2.5mm, 3mm, etc.), and the partial structure is used to position the first insulating frame 127 and the second insulating frame 128 in the winding groove 130. The first insulating frame 127 and the second insulating frame 128 can also only cover the end surface of the stator core 110.

[0057] In order to achieve electrical insulation in the winding groove 130, the motor of the embodiment of the utility model includes an insulating sheet 300. The insulating sheet 300 surrounds the inner side of the winding groove 130 and is fixedly connected to the winding groove 130. The thickness of the insulating sheet 300 is significantly less than the thickness of the plug-in wall of the motor in the prior art. The insulating sheet 300 can be made of insulating paper with a smaller thickness, or other thin sheet materials with insulating properties, which are not specifically limited here. The insulating sheet 300 can be fixed to the first insulating frame 127 and the second insulating frame 128 by bonding, clamping, screw connection, etc., and can also be fixed to the stator core 110, which is not specifically limited here. The insulating sheet 300 is arranged around the inner side of the winding groove 130, and an insulating sheet 300 is respectively arranged in each winding groove 130. The insulating sheet 300 is attached to the inner wall of the winding groove 130, so that when the winding 150 is in the winding process, the insulating sheet 300 plays a role of electrical insulation between the winding 150 and the stator core 110.

[0058] As an alternative embodiment, the entire stator assembly 100 is provided with one insulating sheet 300 and is configured to be continuously arranged in a plurality of winding slots 130. Of course, the stator assembly 100 may also be provided with multiple insulating sheets 300, each insulating sheet 300 being configured to be continuously arranged in at least two winding slots 130.

[0059] When the insulating sheet 300 is connected to the first insulating frame 127 and the second insulating frame 128 respectively along the direction of the rotation axis O, the insulating sheet 300 can be flush with the ends of the first insulating frame 127 and the second insulating frame 128, or protrude from the first insulating frame 127 and the second insulating frame 128.

[0060] The motor of the embodiment of the utility model is provided with a first insulating frame 127 and a second insulating frame 128 connected to the two ends of the stator core 110 respectively, and the first insulating frame 127 and the second insulating frame 128 are connected by an insulating sheet 300, the insulating sheet 300 is arranged around the inner side of the winding slot 130, and the winding 150 is electrically insulated from the stator core 110 through the first insulating frame 127, the second insulating frame 128 and the insulating sheet 300. Moreover, the use of the insulating sheet 300 to replace the plug-in wall of the insulating frame 120 in the prior art can increase the effective area of ​​the winding slot 130. Due to the increase in the effective area of ​​the winding slot 130, the number of turns that can be wound in the first layer close to the stator teeth 112 of the winding 150 increases, and the number of turns that can be wound in each subsequent layer also increases accordingly; therefore, when the same number of turns are wound, the length of the copper wire required in this embodiment is shorter, which reduces the copper consumption of the winding 150, thereby reducing the copper consumption and manufacturing cost. This embodiment can increase the number of turns of the winding 150 while keeping the outer dimensions of the motor unchanged, thereby maximizing the motor power.

[0061] Reference Figure 2 , Figure 8 and Fig. 9 As shown, in the embodiment of the utility model, the rotor core 210 includes a plurality of core units 211, and the plurality of core units 211 are fan-shaped, and the plurality of core units 211 are arranged around the rotation axis O. An installation slot 230 is formed between adjacent core units 211, and a plurality of permanent magnets 220 are respectively installed in the corresponding installation slots 230, and the permanent magnets 220 and the installation slots 230 cooperate with each other so that the permanent magnets 220 are not thrown out during the movement of the rotor assembly 200. The core unit 211 includes a plurality of rotor punchings stacked along the direction of the rotation axis O, and the rotor punchings of each core unit 211 are composed of rotor punchings of one or more structures, or the rotor punchings of each core unit 211 adopt different structures, which is not specifically limited here. The stator core 110 includes a plurality of stator punchings stacked along the direction of the rotation axis O, and the plurality of stator punchings are composed of stator punchings of one or more structures.

[0062] The thickness of the insulating sheet 300 is d. The insulating sheet 300 is generally made of a material of equal thickness. If the thickness of the insulating sheet 300 is not equal at different positions, the thickness of the portion of the insulating sheet 300 located in the winding groove 130 is defined as d.

[0063] The maximum thickness of the stator sheet is t1. Generally speaking, the thickness of multiple stator sheets is equal. If stator sheets of different thicknesses are used, the thickness of the stator sheet with the larger thickness is defined as t1. The maximum thickness of the rotor sheet is t2. Generally speaking, the thickness of multiple rotor sheets is equal. If rotor sheets of different thicknesses are used, the thickness of the rotor sheet with the larger thickness is defined as t2.

[0064] Since the outer wall surface of the stator core 110 is generally a non-circular surface, the inner wall surface of the stator core 110 may be a non-circular surface. In order to clearly define the outer diameter of the stator core 110, the maximum outer diameter of the stator core 110 is defined as D1, and the minimum inner diameter of the stator core 110 is defined as D2. Both D1 and D2 are diameters passing through the rotation axis O.

[0065] Since the outer wall surface of the rotor core 210 is generally a non-circular surface, the inner wall surface of the rotor core 210 may be a non-circular surface. In order to clearly define the outer diameter of the rotor core 210, the maximum outer diameter of the rotor core 210 is defined as D3, and the minimum inner diameter of the rotor core 210 is defined as D4. D3 and D4 are both diameters passing through the rotation axis O. It should be noted that the minimum inner diameter D4 of the rotor core 210 is the diameter of the circle with the smallest diameter formed by the wall surface of the rotor core 210 on the side close to the rotating shaft 250; for example, when the rotor core 210 includes an inner core and an outer core arranged around the outer side of the inner core, the minimum diameter of the inner hole of the inner core is defined as the minimum inner diameter D4 of the rotor core 210; if the rotor core 210 does not include an inner core, but only includes a plurality of core units 211 arranged around the rotating shaft 250, the diameter of the circle formed by the end points of the plurality of core units 211 closest to the rotating shaft 250 along the radial direction is defined as the minimum inner diameter D4 of the rotor core 210.

[0066] The motor of the utility model embodiment meets the following requirements:

[0067]

[0068] That is, the value of [(D3-D4)*t2] / [(D1–D2)*t1*d] can be 4, 8.3, 10, 14, 20, 30, 40, etc.

[0069] The above parameter range reflects the relationship between the inner and outer diameter difference of the stator core 110, the inner and outer diameter difference of the rotor core 210, the stator punching sheet, the rotor punching sheet and the thickness of the insulating sheet 300, and its value is directly related to the magnetic load and electric load of the motor, as well as the iron loss and copper loss. It is understandable that if the difference D3-D4 between the inner and outer diameters of the stator core 110 is too large, the electric load of the motor will increase, the stator assembly 100 will compete with the rotor side of the motor for the slot area, resulting in a decrease in the magnetic load and a decrease in the performance of the motor; if the difference D1-D2 between the inner and outer diameters of the rotor core 210 is too large, the space on the stator side of the motor will decrease, the magnetic load of the motor will increase, and the electric load will decrease, resulting in a decrease in the performance of the motor.

[0070] Therefore, the difference between the inner and outer diameters of the stator core 110 and the difference between the inner and outer diameters of the rotor core 210 influence and are closely related to each other. Therefore, there is a reasonable range for the ratio between the difference between the inner and outer diameters of the stator core 110 and the difference between the inner and outer diameters of the rotor core 210, so that the performance of the motor is in a better state.

[0071] The smaller the maximum thickness t1 of the stator punching sheet, the smaller the iron loss and the higher the efficiency of the motor, but the higher the cost and the higher the manufacturing difficulty; the larger t1 is, the greater the iron loss and the lower the efficiency of the motor, but the lower the cost and the lower the manufacturing difficulty.

[0072] The smaller the maximum thickness t2 of the rotor punching, the worse the magnetic conductivity and the higher the cost; the larger t2 is, the better the magnetic conductivity and the lower the cost.

[0073] The thickness d of the insulating sheet 300 determines the insulation thickness. The smaller d is, the larger the slot area of ​​the winding slot 130 is, the smaller the copper loss is, and the higher the efficiency of the motor is; the larger d is, the smaller the slot area of ​​the winding slot 130 is, and the greater the copper loss is.

[0074] In summary, when the parameters of the motor of this embodiment meet the above ranges, the space between the stator assembly 100 and the rotor assembly 200 can be reasonably allocated to achieve a balance between the electrical load and the magnetic load, as well as a balance between the iron loss and the copper loss, so that the motor can obtain better performance.

[0075] In order to further improve the performance of the motor, the motor of this embodiment can further meet the following requirements:

[0076]

[0077] That is, the value of [(D3-D4)*t2] / [(D1–D2)*t1*d] can be 14, 15, 20, 30, 40, etc.

[0078] Reference Figure 7 As shown, in one embodiment of the utility model, along the direction of the rotation axis O, both ends of the stator core 110 are provided with a sink 140, and the number of the sink 140 is twice the number of the winding slots 130. Each winding slot 130 is provided with a sink 140 at both ends, and the sink 140 is arranged around the inner side of the corresponding winding slot 130. Due to the provision of the sink 140, the first insulating frame 127 and the second insulating frame 128 can be fixedly connected to the corresponding sink 140, and the positioning of the sink 140 makes the assembly of the first insulating frame 127 and the second insulating frame 128 with the stator core 110 more stable. In some embodiments, since the first insulating frame 127 and the second insulating frame 128 have a wall portion 122 extending to the winding slot 130, after the wall portion 122 is built into the sink 140, it is beneficial to reduce the occupation of the wall portion 122 on the winding slot 130 and increase the effective area of ​​the winding slot 130. Moreover, the sink groove 140 is only arranged at the two ends of the winding groove 130, that is, the width of the tooth portion 113 is reduced only at the two end parts of the stator tooth 112, and the width of the tooth portion 113 in the middle part of the winding groove 130 remains unchanged. Compared with directly shortening the width of the entire tooth portion 113, this embodiment can improve the problem of narrowing of the magnetic circuit and increased magnetic saturation, thereby suppressing the degradation of motor performance.

[0079] In another embodiment of the utility model, the groove 140 is only provided at one end of the stator core 110, and the other end of the stator core 110 is not provided with the groove 140. Similarly, the copper usage of the winding 150 can be reduced when the same number of turns is wound, and the number of turns of the winding 150 can be increased when the outer contour size of the motor remains unchanged, thereby achieving an increase in the motor power.

[0080] In another embodiment of the utility model, along the circumferential direction, two ends of a part of the stator teeth 112 are provided with a sinking groove 140, and two ends of another part of the stator teeth 112 are not provided with a sinking groove 140, for example, only two ends of the winding groove 130 on both sides of the stator teeth 112 where the enameled wire is wound are provided with a sinking groove 140. Therefore, the stator teeth 112 provided with the sinking groove 140 can also reduce the copper usage of the winding 150 when the same number of turns is wound, and increase the number of turns of the winding 150 wound on the winding groove 130 on both sides of the stator teeth 112 when the outer contour size of the motor remains unchanged, thereby maximizing the power of the motor.

[0081] The embodiment of the utility model is introduced by taking the example that both ends of the winding groove 130 are provided with a sink 140. The first insulating frame 127 and the second insulating frame 128 each include a base 121 and a wall 122. The base 121 is connected to the end of the stator core 110, and the wall 122 is connected to the two opposite edges of the base 121. The two wall portions 122 are respectively located in two adjacent sinks 140. In two circumferentially adjacent winding grooves 130, the base 121 is connected to the stator teeth 112 between the two winding grooves 130 and the partial structure of the yoke 111 connected to both sides of the stator teeth 112, the wall portion 122 on one side of the base 121 is built into the sink 140 of one of the winding grooves 130, and the wall portion 122 on the other side of the base 121 is built into the sink 140 of the other winding groove 130. The first insulating frame 127 and the second insulating frame 128 can be connected to the tooth portion 113 through the slots formed by the wall portions 122 on both sides. As an alternative embodiment, the wall portion 122 can be provided only on the edge of one side of the base portion 121, and the wall portion 122 is not provided on the edge of the other side of the base portion 121, which can also reduce the copper usage of the winding 150 under the same number of turns, and increase the number of turns of the winding 150 under the condition that the outer contour size of the motor remains unchanged, thereby achieving an increase in the motor power.

[0082] Reference Figure 8As shown, in the embodiment of the utility model, the insulating sheet 300 is fixedly connected to the wall portion 122. In order to meet the requirements of the creepage distance, the wall portions 122 of the first insulating frame 127 and the second insulating frame 128 need to meet a certain overlap distance with the insulating sheet 300, so the axial size of the wall portion 122 needs to be designed according to the creepage distance. In the embodiment of the utility model, along the axial direction, the overlap height h between the insulating sheet 300 and the first insulating frame 127 and the second insulating frame 128 is greater than or equal to 2.5mm. The insulating sheet 300 and the first insulating frame 127 and the second insulating frame 128 referred to here all correspond to the insulating sheet 300 and the first insulating frame 127 and the second insulating frame 128 with the winding 150 wound thereon. It can be understood that the length of the wall portion 122 in the axial direction can also be set to be greater than or equal to 2.5mm, so as to ensure the creepage distance.

[0083] Reference Figure 2 and Figure 3 As shown, in a motor of an embodiment of the utility model, the tooth portion 113 is provided with a first side wall 1131 and a second side wall 1132 on two sides away from each other along the circumferential direction, and the maximum distance between the first side wall 1131 and the second side wall 1132 is W t Since the stator core 110 of this embodiment has a sinking groove 140, the distances between the first side wall 1131 and the second side wall 1132 of different punching sheets are different, and the tooth width of the punching sheet constituting the non-sinking groove 140 portion is greater than the tooth width of the punching sheet constituting the sinking groove 140 portion. Therefore, the tooth width of the punching sheet constituting the non-sinking groove 140 portion is defined as W. t , that is, W t is the maximum width of the tooth portion 113. The maximum outer diameter of the stator core 110 is defined as D1, and the minimum inner diameter of the stator core 110 is defined as D2. Both D1 and D2 are diameters passing through the rotation axis O. The maximum outer diameter of the rotor core 210 is defined as D3, and the minimum inner diameter of the rotor core 210 is defined as D4. Both D3 and D4 are diameters passing through the rotation axis O. It should be noted that the minimum inner diameter D4 of the rotor core 210 is the diameter of the circle with the smallest diameter formed by the wall surface of the rotor core 210 on the side close to the rotating shaft 250; for example, when the rotor core 210 includes an inner core and an outer core arranged around the outer side of the inner core, the minimum diameter of the inner hole of the inner core is defined as the minimum inner diameter D4 of the rotor core 210; if the rotor core 210 does not include an inner core, but only includes a plurality of core units 211 arranged around the rotating shaft 250, the diameter of the circle formed by the end points of the plurality of core units 211 closest to the rotating shaft 250 along the radial direction is defined as the minimum inner diameter D4 of the rotor core 210.

[0084] The embodiments of the present utility model satisfy:

[0085]

[0086] The above parameter range reflects the relationship between the inner and outer diameter difference of the rotor assembly 200, the inner and outer diameter difference of the stator assembly 100, the tooth width and the outer diameter of the stator core 110. The above parameter can be 31.5, 40, 43.3, 45, 50, 53.5, etc. The maximum outer diameter D1 of the stator core 110 determines the outer contour size of the stator assembly 100, and also determines the outer dimensions of the motor, and indirectly affects the outer contour size of the rotor assembly 200. D1 is proportional to the volume of the motor and proportional to the output capacity of the motor. t It is inversely proportional to the amount of winding 150. The larger this value is, the smaller the area of ​​winding slot 130 is, the fewer windings 150 are accommodated, the lower the electrical load of the motor is, the greater the copper loss is, but the wider the magnetic circuit is, the lower the magnetic density is, and the smaller the iron loss is; W t The smaller the size, the larger the area of ​​winding slot 130, the greater the copper loss, but the narrower the magnetic circuit, the higher the magnetic density, and the greater the iron loss. t The effect of D1 is greater on the above parameters. 2 and Wt 2 It is helpful to amplify the effects of the two parameters.

[0087] The value of D1-D2 determines the width of the stator side, affects the capacity of the winding 150, and affects the copper loss; 1 / (D1-D2) is negatively correlated with the electrical load of the stator. The larger this value is, the smaller the wire that can be accommodated is, and the lower the electrical load is. The value of D3-D4 determines the width of the rotor side and is positively correlated with the electrical load of the rotor. The larger this value is, the more permanent magnets 220 can be accommodated, the larger the magnetic flux of the permanent magnets 220 is, the larger the air gap magnetic density is, the iron loss increases, and the performance decreases; conversely, the smaller the value of D3-D4 is, the smaller the magnetic flux of the permanent magnets 220 is, the smaller the air gap magnetic density is, the copper loss increases, and the performance decreases. Therefore, the value of D3-D4 needs to be selected as the optimal value, that is, it cannot be too large or too small.

[0088] It should be noted that, in order to take into account both the iron loss and the copper loss of the motor, this embodiment optimizes the efficiency of the motor by limiting the above parameters within the range of 31.5 to 53.5.

[0089] Reference Figure 7As shown, in another embodiment of the motor of the utility model, a positioning column 129 is provided on the inner side of the base 121 of the insulating frame 120, and a positioning hole 119 is provided on the stator core 110 to cooperate with the positioning column 129. For example, the number of matching positioning columns 129 and positioning holes 119 can be set to one or more. When the number is set to more than one, multiple positioning columns 129 or multiple positioning holes 119 are arranged at intervals. The insulating frame 120 is firmly connected to the stator core 110 through the snap-fitting of at least one positioning column 129 and the positioning hole 119. It can be understood that, as an alternative embodiment, the base 121 is provided with at least one positioning hole 119, and the stator core 110 is provided with at least one positioning column 129 to cooperate with the positioning hole 119.

[0090] Reference Fig.10 and Fig.11 As shown, in the embodiment of the present invention, along the circumference of the rotor assembly 200, the maximum width of the permanent magnet 220 is W mag Generally speaking, the cross section of the permanent magnet 220 is a rectangle, so the maximum width of the permanent magnet 220 is the distance between the two long sides of the rectangle. If the cross section of the permanent magnet 220 is an ellipse-like structure, the width between the two points of the permanent magnet 220 that are farthest apart along the circumferential direction is defined as W. mag .W mag The larger the value, the better the magnetic properties, but the magnetic load becomes larger, the iron loss is large, and the copper loss is small; W mag The smaller it is, the larger the magnetic conductive area becomes, the smaller the magnetic load becomes, the smaller the iron loss is, and the larger the copper loss is.

[0091] In the radial direction of the rotor assembly 200, the minimum width of the mounting groove 230 at the end away from the rotation axis O is so1, and the minimum width of the mounting groove 230 at the end close to the rotation axis O is so2. In the radial direction, the end of the core unit 211 close to the rotation axis O is provided with a first protrusion 212, the first protrusion 212 is connected to the side wall close to the mounting groove 230, and protrudes toward the mounting groove 230, and the minimum width of the second notch 214 formed between the oppositely arranged first protrusions 212 is so1; the end of the core unit 211 away from the rotation axis O is provided with a second protrusion 213, the second protrusion 213 is connected to the side wall close to the mounting groove 230, and protrudes toward the mounting groove 230, and the minimum width of the third notch 215 formed between the oppositely arranged second protrusions 213 is so2.

[0092] It can be understood that the larger so1 is, the smaller the magnetic flux leakage is, but the worse the supporting capacity for the permanent magnet 220 is; the smaller so1 is, the better the supporting capacity for the permanent magnet 220 is, but the larger the magnetic flux leakage is. The larger so2 is, the smaller the magnetic flux leakage is, but the worse the supporting capacity for the permanent magnet 220 is; the smaller so2 is, the better the supporting capacity for the permanent magnet 220 is, but the larger the magnetic flux leakage is.

[0093] In summary, so1, so2 and W mag Satisfy between: 0.5≤so1 / W mag ≤0.6, and 0.5≤so2 / W mag When the above parameter range is met, the installation structure of the permanent magnet 220 is stable and is not easily thrown out from the slots on both sides of the installation slot 230. In addition, the area ratio of the core unit 211 and the installation slot 230 is reasonable, and the performance of the motor is guaranteed.

[0094] Reference Fig.11 As shown, it can be understood that so1 and so2 satisfy: 0.9≤so1 / so2≤1. When the above parameter range is met, the limiting effect of the permanent magnet 220 on both sides of the radial direction can be guaranteed, the installation of the permanent magnet 220 and the rotor core 210 can be further stabilized, and the structural stability of the rotor assembly 200 can be improved. In this embodiment, so1 is preferably 3mm, and so2 is preferably 3.15mm.

[0095] Reference Fig. 9 As shown, the rotor assembly 200 further includes a molded part 240. In the radial direction, the molded part 240 fills the side of the mounting groove 230 close to the rotation axis O, and the side of the mounting groove 230 away from the rotation axis O. Therefore, the molded part 240 can fill the second notch 214 formed by the two first protrusions 212 arranged oppositely at one end of the mounting groove 230, and fill the third notch 215 formed by the two second protrusions 213 arranged oppositely at the other end of the mounting groove 230, so that the permanent magnet 220 and the core unit 211 can be stably connected, and the permanent magnet 220 can be effectively prevented from escaping from the mounting groove 230 of the rotor core 210, thereby improving the reliability and stability of the rotor assembly 200.

[0096] The rotating shaft 250 is arranged in the enclosed space of multiple core units 211, and there is a gap space between the rotating shaft 250 and the core units 211. The overmolded part 240 also fills the gap space between the rotating shaft 250 and the multiple core units 211, so that the connection between the rotating shaft 250 and the rotor core 210 is more stable, effectively suppressing the relative rotation between the rotating shaft 250 and the rotor core 210, and improving the reliability and stability of the rotor assembly 200.

[0097] The core unit 211 is further provided with an injection hole 216 extending along the direction of the rotation axis O. The injection hole 216 is filled with a plastic overmolding member 240 , which can improve the overall stability of the core unit 211 .

[0098] During the processing of the rotor core 210 of the embodiment of the utility model, it is necessary to first fix the rotor core 210, the permanent magnet and the rotating shaft 250, and then use the injection molding material to overmold the rotor core 210 as a whole. The overmolded part 240 fills the side of the installation groove 230 close to the rotation axis O and the side of the installation groove 230 away from the rotation axis O, as well as the gap space between the rotating shaft 250 and the multiple core units 211, and the injection molding hole 216 in the core unit 211, thereby improving the overall reliability and stability of the rotor assembly 200.

[0099] A household appliance of one embodiment of the utility model comprises the motor of the above embodiment. It is understandable that the motor of the embodiment can be used in household appliances such as electric fans, air conditioners, dehumidifiers, refrigerators, washing machines, etc. The motor is a core component of the household appliance, which is used to drive the fan, impeller or drum and other components to rotate, thereby realizing the functions of the household appliance.

[0100] The household appliance of the embodiment of the utility model adopts the motor of the embodiment of the first aspect, and the motor defines that the thickness of the insulating sheet 300 is d, the maximum outer diameter of the stator core 110 is D1, the minimum inner diameter of the stator core 110 is D2, the maximum thickness of the stator punching sheets stacked to form the stator core 110 is t1, the minimum inner diameter of the rotor core 210 is D3, the minimum inner diameter of the rotor core 210 is D4, and the maximum thickness of the rotor punching sheets stacked to form the rotor core 210 is t2. However, the value of [(D3-D4)*t2] / [(D1–D2)*t1*d] is directly related to the magnetic load and electric load of the motor, as well as the iron loss and copper loss. Therefore, limiting the above parameters within the range of 4 to 40 can reasonably allocate the space between the stator assembly 100 and the rotor assembly 200, achieve a balance between the electric load and the magnetic load, and a balance between the iron loss and the copper loss, so that the motor can obtain better performance.

[0101] Since the household appliance of the embodiment of the utility model adopts all the technical solutions of the motor of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described in detail here.

[0102] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A motor, characterized in that include: A rotor assembly rotates around a rotation axis, the rotor assembly comprising a rotor core and a plurality of permanent magnets, the rotor core comprising a plurality of core units arranged around the rotation axis, mounting grooves being formed between adjacent core units, and the plurality of permanent magnets being respectively mounted in corresponding mounting grooves; The stator assembly comprises a stator core and two insulating frames connected to the two ends of the stator core along the rotation axis, wherein the stator core comprises a yoke and a plurality of stator teeth, wherein the yoke is arranged around the outer side of the rotor assembly, and the plurality of stator teeth are arranged around the inner side of the yoke and spaced along the circumferential direction of the rotor assembly; and a winding slot is formed between two adjacent stator teeth along the circumferential direction; An insulating sheet, along the direction of the rotation axis, the two ends of the insulating sheet are respectively connected to the two insulating frames, the insulating sheet is arranged around the inner side of the winding groove, and the thickness of the insulating sheet is d; The stator core comprises a plurality of stator punching sheets stacked along the direction of the rotation axis, and the maximum thickness of the stator punching sheets is t1; The core unit comprises a plurality of rotor punchings stacked along the direction of the rotation axis, and the maximum thickness of the rotor punchings is t2; The maximum outer diameter of the stator core is D1, and the minimum inner diameter of the stator core is D2; The maximum outer diameter of the rotor core is D3, and the minimum inner diameter of the rotor core is D4; satisfying:

2. The motor according to claim 1, characterized in that: The stator teeth include a tooth portion and a tooth top. One end of the tooth portion is connected to the yoke portion, and the other end is connected to the tooth top. The maximum width of the tooth portion is W. t ,satisfy:

3. The motor according to claim 1, characterized in that: Along the direction of the rotation axis, at least one end of the stator core is provided with a sinking groove, the sinking groove is located at the end of the winding groove and is arranged around the inner side of the winding groove, and the insulating frame is fixedly connected to the sinking groove.

4. The motor according to claim 3, characterized in that: The insulating frame includes a base and a wall connected to a portion of the outer edge of the base, the base is connected to the end of the stator core, the wall is arranged in the sink, and the insulating sheet is fixedly connected to the wall.

5. The motor according to claim 1, characterized in that: Along the radial direction of the rotor assembly, the minimum width of the mounting groove at one end away from the rotation axis is so1, and the minimum width of the mounting groove at one end close to the rotation axis is so2, satisfying: 0.5≤so1 / W mag ≤0.6, and 0.5≤so2 / W mag ≤0.

6.

6. The motor according to claim 4, characterized in that: The minimum width so1 of the mounting groove at one end away from the rotation axis and the minimum width so2 of the mounting groove at one end close to the rotation axis satisfy: 0.9≤so1 / so2≤1.

7. The motor according to claim 1, characterized in that: The rotor assembly further comprises a molded part, which fills a side of the mounting groove close to the rotation axis, a side of the mounting groove away from the rotation axis and a gap between the permanent magnet and the mounting groove along the radial direction of the rotor assembly.

8. The motor according to claim 7, characterized in that: The rotor assembly also includes a rotating shaft, which is arranged in the enclosed space of the multiple core units, and the overmolded component also fills the space between the rotating shaft and the multiple core units.

9. The motor according to claim 7, characterized in that: The core unit is also provided with an injection hole extending in the direction of the rotation axis, and the overmolded part is also filled in the injection hole.

10. A household appliance, characterized in that: A motor comprising any one of claims 1 to 9.

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