Motor and electrical equipment

Abstract

The utility model discloses a motor and electrical equipment, and relates to the technical field of electrical equipment, the motor comprises a stator and a rotor, the stator comprises a stator iron core, the stator iron core comprises a stator yoke part and a plurality of stator tooth parts, and the plurality of stator tooth parts are arranged at intervals along the circumferential direction of the stator yoke part; the rotor comprises a magnetizer and a plurality of permanent magnets, the magnetizer is wound on the periphery of the stator, and the permanent magnets are arranged at intervals in the circumferential direction of the magnetizer; the maximum outer diameter of the rotor is D1, the maximum outer diameter of the stator is D2, the maximum radial thickness of the permanent magnet is H1, the maximum radial thickness of the magnetizer is H2, and the maximum width of the tooth part of the stator is W; the following conditions are satisfied: 71 mm < = D1 < = 75 mm, 0.77 < = D2 / D1 < = 0.82, 0.3 < = H2 / H1 < = 0.5, and 0.23 < = W / (D1-D2) < = 0.27. According to the utility model, by optimizing the size of each part of the motor, the utilization rate of a magnetic circuit is improved, and the efficiency of the motor is improved.

Description

Technical Field

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

[0002] Permanent magnet motors have the advantages of simple structure, high power density, wide high efficiency area, and high torque density. They have become the mainstream motor type in the market and are widely used in modern industrial systems.

[0003] At present, with the proposal of carbon peak and carbon neutrality, the requirements for motor energy efficiency are getting higher and higher, so ultra-high efficiency motors have a certain prospect, but due to the installation size restrictions of motors, energy efficiency is often subject to certain restrictions. In particular, when the maximum outer diameter of the rotor in the outer rotor motor is limited to between 71mm and 75mm, the design of the size of each component of the motor in the related art is difficult to make the motor energy efficiency reach a high level. Utility Model Content

[0004] 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 optimize the size of each component of the motor and improve the utilization rate of the motor magnetic circuit, so that the motor efficiency reaches a higher level within the outer diameter size limit.

[0005] The utility model also provides an electrical device having the motor.

[0006] According to the first aspect of the present invention, the motor comprises a stator and a rotor, wherein the stator comprises a stator core, wherein the stator core comprises a stator yoke and a plurality of stator teeth, wherein the plurality of stator teeth are connected to the outer side of the stator yoke and are arranged at intervals along the circumference of the stator yoke; and the rotor comprises a magnetizer and a plurality of permanent magnets, wherein the magnetizer is wound around the outer circumference of the stator, and the plurality of permanent magnets are connected to the inner side of the magnetizer and are arranged at intervals along the circumference of the magnetizer.

[0007] Among them, the maximum outer diameter of the rotor is D1, the maximum outer diameter of the stator is D2, the maximum radial thickness of the permanent magnet is H1, the maximum radial thickness of the magnetizer is H2, and the maximum width of the stator teeth is W; satisfying: 71mm≤D1≤75mm, 0.77≤D2 / D1≤0.82, 0.3≤H2 / H1≤0.5, 0.23≤W / (D1-D2)≤0.27.

[0008] The motor according to the embodiment of the utility model has at least the following beneficial effects:

[0009] In the motor of the present application, the value of the maximum outer diameter D1 of the rotor is between 71mm-75mm, and the value of D2 / D1 is between 0.77-0.82, so that the magnetic field energy provided by the permanent magnet 220 can be more matched with the size of the stator 100, thereby making the magnetic circuit of the motor more reasonable. In addition, 0.3≤H2 / H1≤0.5 and 0.23≤W / (D1-D2)≤0.27 are satisfied at the same time, so that the efficiency of the motor can be improved to an extremely high level, so that the efficiency of the motor reaches an extremely high level when the maximum outer diameter D1 of the rotor is limited to between 71mm-75mm.

[0010] Specifically, under the premise that the value of the maximum outer diameter D1 of the rotor is between 71mm-75mm, if the value of D2 / D1 is too small, the amount of permanent magnet used is large, the magnetic field capacity of the motor is strong, and the stator size is small, it is impossible to make a large magnetic field energy pass through the stator, and oversaturation will occur, wasting magnetic field resources and making the motor efficiency low; if the value of D2 / D1 is too large, the amount of permanent magnet used is small, the magnetic field energy of the motor is small, in order to achieve the required output power, more windings need to be wound on the stator to compensate, so that the winding loss is high and the motor efficiency is low. In the present application, under the premise that the value of the maximum outer diameter D1 of the rotor is between 71mm-75mm, the value of D2 / D1 satisfies between 0.77-0.82, which can make the magnetic field energy provided by the permanent magnet more matched with the stator size, so that the magnetic circuit of the motor is more reasonable. In addition, if the maximum radial thickness H2 of the magnetizer is small, the magnetic field of the permanent magnet will be crowded when passing through the magnetizer, resulting in magnetic saturation, which ultimately leads to low motor efficiency; if the maximum radial thickness H2 of the magnetizer is large, the amount of permanent magnet used will be small, making the magnetic motive force of the magnetic field small, and the amount of windings on the stator needs to be increased to compensate, resulting in large winding losses and low motor efficiency. In this application, based on the premise that the maximum outer diameter D1 of the rotor is between 71mm-75mm, the value of D2 / D1 is between 0.77-0.82, which can make the magnetic field energy provided by the permanent magnet more matched with the stator size, thereby making the magnetic circuit of the motor more reasonable. At the same time, 0.3≤H2 / H1≤0.5 can further improve the efficiency of the motor. Furthermore, if the maximum width W of the stator teeth is small, the magnetic field is crowded when passing through, which ultimately makes the motor efficiency low; if the maximum width W of the stator teeth is large, it will lead to waste of magnetic circuit. At the same time, the maximum width W of the stator teeth will compress the winding area, so that the winding wire diameter needs to be reduced, the winding resistance increases, the loss increases accordingly, and the motor efficiency decreases. In this application, based on the premise that the maximum outer diameter D1 of the rotor is between 71mm-75mm, the value of D2 / D1 is between 0.77-0.82, which can make the magnetic field energy provided by the permanent magnet more matched with the stator size, thereby making the magnetic circuit of the motor more reasonable. At the same time, 0.3≤H2 / H1≤0.5, 0.23≤W / (D1-D2)≤0.27 can further improve the efficiency of the motor.

[0011] According to some embodiments of the present invention, the maximum radial thickness of the stator yoke is H3, which satisfies: 0.14≤H3 / (D1-D2)≤0.17.

[0012] According to some embodiments of the present invention, the stator core further comprises a plurality of pole shoes, and the plurality of pole shoes are connected one by one to one ends of the plurality of stator teeth away from the stator yoke;

[0013] The maximum radial thickness of the pole shoe portion is H4, which satisfies: 0.55≤H4 / W≤0.59.

[0014] According to some embodiments of the present invention, the permanent magnet has a first arc surface, a second arc surface and a third arc surface on a side close to the stator, and the second arc surface and the third arc surface are respectively connected to both sides of the first arc surface along the circumferential direction of the rotor;

[0015] Wherein, the distance between the second arc surface and the central axis of the magnetizer, and the distance between the third arc surface and the central axis of the magnetizer, are both greater than the distance between the first arc surface and the central axis of the magnetizer.

[0016] According to some embodiments of the present invention, the distance between the second arc surface and the central axis of the magnetic conductor gradually increases along the first direction, and the distance between the third arc surface and the central axis of the magnetic conductor gradually increases along the second direction;

[0017] The first direction is a direction from the first arc surface to the second arc surface, and the second direction is a direction from the first arc surface to the third arc surface.

[0018] According to some embodiments of the present invention, the permanent magnet is an axisymmetric structure, and the permanent magnet has a symmetry center line, which extends radially along the magnetizer and intersects with the central axis of the magnetizer.

[0019] According to some embodiments of the present invention, the number of the permanent magnets is greater than the number of the stator teeth.

[0020] According to some embodiments of the present invention, the stator core includes a plurality of stacked silicon steel sheets, and the maximum thickness of the silicon steel sheets is between 0.18 mm and 0.22 mm.

[0021] According to some embodiments of the present invention, the plurality of stator teeth are evenly and spaced apart along the circumference of the stator yoke, and / or the plurality of permanent magnets are evenly and spaced apart along the circumference of the magnetic conductor.

[0022] The electrical equipment according to the embodiment of the second aspect of the utility model includes the motor described in the above embodiment.

[0023] The electrical equipment according to the embodiment of the utility model has at least the following beneficial effects:

[0024] The electrical equipment of the present application has the above-mentioned motor, in which, on the premise that the value of the maximum outer diameter D1 of the rotor is between 71mm-75mm, the value of D2 / D1 satisfies between 0.77-0.82, so that the magnetic field energy provided by the permanent magnet 220 can be more matched with the size of the stator 100, thereby making the magnetic circuit of the motor more reasonable. In addition, 0.3≤H2 / H1≤0.5 and 0.23≤W / (D1-D2)≤0.27 are satisfied at the same time, so that the efficiency of the motor can be improved to an extremely high level, so that the motor efficiency reaches an extremely high level when the maximum outer diameter D1 of the rotor is limited to between 71mm-75mm.

[0025] Specifically, under the premise that the value of the maximum outer diameter D1 of the rotor is between 71mm-75mm, if the value of D2 / D1 is too small, the amount of permanent magnet used is large, the magnetic field capacity of the motor is strong, and the stator size is small, it is impossible to make a large magnetic field energy pass through the stator, and oversaturation will occur, wasting magnetic field resources and making the motor efficiency low; if the value of D2 / D1 is too large, the amount of permanent magnet used is small, the magnetic field energy of the motor is small, in order to achieve the required output power, more windings need to be wound on the stator to compensate, so that the winding loss is high and the motor efficiency is low. In the present application, under the premise that the value of the maximum outer diameter D1 of the rotor is between 71mm-75mm, the value of D2 / D1 satisfies between 0.77-0.82, which can make the magnetic field energy provided by the permanent magnet more matched with the stator size, so that the magnetic circuit of the motor is more reasonable. In addition, if the maximum radial thickness H2 of the magnetizer is small, the magnetic field of the permanent magnet will be crowded when passing through the magnetizer, resulting in magnetic saturation, which ultimately leads to low motor efficiency; if the maximum radial thickness H2 of the magnetizer is large, the amount of permanent magnet used will be small, making the magnetic motive force of the magnetic field small, and the amount of windings on the stator needs to be increased to compensate, resulting in large winding losses and low motor efficiency. In this application, based on the premise that the maximum outer diameter D1 of the rotor is between 71mm-75mm, the value of D2 / D1 is between 0.77-0.82, which can make the magnetic field energy provided by the permanent magnet more matched with the stator size, thereby making the magnetic circuit of the motor more reasonable. At the same time, 0.3≤H2 / H1≤0.5 can further improve the efficiency of the motor. Furthermore, if the maximum width W of the stator teeth is small, the magnetic field is crowded when passing through, which ultimately makes the motor efficiency low; if the maximum width W of the stator teeth is large, it will lead to waste of magnetic circuit. At the same time, the maximum width W of the stator teeth will compress the winding area, so that the winding wire diameter needs to be reduced, the winding resistance increases, the loss increases accordingly, and the motor efficiency decreases. In this application, based on the premise that the maximum outer diameter D1 of the rotor is between 71mm-75mm, the value of D2 / D1 is between 0.77-0.82, which can make the magnetic field energy provided by the permanent magnet more matched with the stator size, thereby making the magnetic circuit of the motor more reasonable. At the same time, 0.3≤H2 / H1≤0.5, 0.23≤W / (D1-D2)≤0.27 can further improve the efficiency of the motor.

[0026] 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

[0027] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0028] Figure 1 This is a schematic diagram of the partial structure of a motor according to an embodiment of the utility model;

[0029] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0030] Figure 3 This is a schematic diagram of the structure of a rotor in one embodiment of the utility model;

[0031] Figure 4 This is a schematic structural diagram of a permanent magnet according to an embodiment of the utility model;

[0032] Figure 5 This is a schematic structural diagram of a stator core of an embodiment of the utility model;

[0033] Figure 6 This is a partial structural schematic diagram of a stator according to an embodiment of the utility model;

[0034] Figure 7 The graph shows the change of motor efficiency with the value of D2 / D1.

[0035] Figure Number:

[0036] 100, stator; 110, stator core; 111, stator yoke; 1111, seventh wall surface; 1112, eighth wall surface; 112, stator tooth portion; 1121, fifth wall surface; 1122, sixth wall surface; 113, pole shoe portion; 1131, ninth wall surface; 1132, tenth wall surface;

[0037] 200, rotor; 210, magnetic conductor; 211, third wall; 212, fourth wall; 220, permanent magnet; 221, first wall; 2211, first arc surface; 2212, second arc surface; 2213, third arc surface; 222, second wall;

[0038] 300. Air gap. 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, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Permanent magnet motors have the advantages of simple structure, high power density, wide high-efficiency area, and high torque density. They have become the mainstream motor type in the market and are widely used in modern industrial systems. At present, with the proposal of carbon peak and carbon neutrality, the requirements for motor energy efficiency are getting higher and higher, so ultra-high efficiency motors have certain prospects, but due to the installation size restrictions of the motor, the energy efficiency is often subject to certain restrictions. In particular, when the maximum outer diameter of the rotor in the outer rotor motor is limited to between 71mm and 75mm, the energy efficiency of the motor is difficult to achieve a high level.

[0044] like Figure 1 As shown, a motor provided by the present application can be applied to electrical equipment, wherein the electrical equipment can be a fan, an air-conditioning compressor, a refrigerator compressor or a drum washing machine, etc.

[0045] like Figure 1 As shown, the motor includes a stator 100 and a rotor 200 . The rotor 200 is disposed around the outer circumference of the stator 100 . The rotor 200 can rotate around the stator 100 . The rotation axis Z of the rotor 200 coincides with the central axis of the rotor 200 and the central axis of the stator 100 .

[0046] It should be noted that the “outer” here refers to the side away from the rotation axis Z of the rotor 200 , and the opposite side is the “inner”, that is, the side close to the rotation axis Z of the rotor 200 is the “inner”.

[0047] like Figure 1 As shown, the stator 100 includes a stator core 110, and the stator core 110 includes a stator yoke 111 and a plurality of stator teeth 112, and the plurality of stator teeth 112 are connected to the outer side of the stator yoke 111 and are arranged at intervals along the circumference of the stator yoke 111. Specifically, the plurality of stator teeth 112 are arranged at intervals along the circumference of the stator yoke 111, one end of each stator tooth 112 is connected to the stator yoke 111, and each stator tooth 112 extends from the stator yoke 111 away from the central axis of the stator yoke 111.

[0048] It can be understood that the stator yoke 111 is a circular ring structure, and the multiple stator teeth 112 are connected to the outer peripheral wall of the stator yoke 111. Specifically, each stator tooth 112 has two oppositely arranged ends, one end of each stator tooth 112 is connected to the outer peripheral wall of the stator yoke 111, and the other end of each stator tooth 112 is facing away from the central axis of the stator yoke 111. In addition, the multiple stator teeth 112 are arranged at intervals along the circumference of the stator yoke 111. Specifically, in this embodiment, the multiple stator teeth 112 are evenly and spacedly arranged along the circumference of the stator yoke 111.

[0049] It should be noted that the stator teeth 112 are used for winding, and the stator teeth 112 can be fixedly connected to the stator yoke 111, or can be detachably connected to the stator yoke 111. In some embodiments, the stator teeth 112 and the stator yoke 111 are an integrally formed structure; in other embodiments, the stator teeth 112 and the stator yoke 111 can be detachably connected by mortise and tenon joints.

[0050] It can be understood that, for multiple stator teeth 112, all of the stator teeth 112 can be fixedly connected to the stator yoke 111; or all of the stator teeth 112 can be detachably connected to the stator yoke 111; or some of the stator teeth 112 can be fixedly connected to the stator yoke 111, while another part of the stator teeth 112 can be detachably connected to the stator yoke 111.

[0051] Specifically in this embodiment, the number of the stator teeth 112 is nine, and the nine stator teeth 112 are all fixedly connected to the stator yoke 111 .

[0052] Combination Figure 1 and Figure 3 The rotor 200 includes a magnetizer 210 and a plurality of permanent magnets 220 . The magnetizer 210 is wound around the outer circumference of the stator 100 , and the plurality of permanent magnets 220 are connected to the inner side of the magnetizer 210 and are spaced apart along the circumferential direction of the magnetizer 210 .

[0053] It is understandable that the magnetizer 210 is in a circular ring structure, and a plurality of permanent magnets 220 are connected to the inner circumferential wall of the magnetizer 210 and are evenly and spacedly arranged along the circumference of the magnetizer 210. In addition, the magnetizer 210 is wound around the outer circumference of the stator 100, and a plurality of permanent magnets 220 surround the stator 100. The permanent magnets 220 can be bonded to the magnetizer 210 or installed on the magnetizer 210 by snapping.

[0054] It should be noted that the number of permanent magnets 220 is greater than the number of stator teeth 112 .

[0055] Specifically in this embodiment, the number of permanent magnets 220 is 12, and the number of stator teeth 112 is nine.

[0056] It can be understood that the number of permanent magnets 220 being greater than the number of stator teeth 112 can reduce the magnetic flux per pole, thereby reducing the risk of magnetic saturation.

[0057] Combination Figure 1 , Figure 3 and Figure 5 , wherein the maximum outer diameter of the rotor 200 is defined as D1, and the maximum outer diameter of the stator 100 is defined as D2.

[0058] It is understood that when measuring D1, the vernier caliper can be used to measure the maximum outer diameter of the rotor 200. When measuring D2, the vernier caliper can be used to measure the maximum outer diameter of the stator 100.

[0059] It should be noted that 71 mm ≤ D1 ≤ 75 mm, 0.77 ≤ D2 / D1 ≤ 0.82. Specifically, the value of D1 may be 71 mm, 72 mm, 73 mm or 74 mm; and the value of D2 / D1 may be 0.77, 0.78, 0.79, 0.80, 0.81 or 0.82.

[0060] like Figure 7 As shown, it should be noted that, under the premise that the maximum outer diameter D1 of the rotor 200 is between 71mm and 75mm, the value of D2 / D1 is between 0.77 and 0.82, which can make the magnetic field energy provided by the permanent magnet 220 more matched with the size of the stator 100, thereby making the magnetic circuit of the motor more reasonable.

[0061] It should be further explained that, under the premise that the value of the maximum outer diameter D1 of the rotor 200 is between 71mm-75mm, if the value of D2 / D1 is too small, the amount of permanent magnet 220 is large, the magnetic field capacity of the motor is strong, and the size of the stator 100 is small, and the large magnetic field energy cannot pass through the stator 100, and oversaturation will occur, wasting magnetic field resources and making the motor efficiency low; if the value of D2 / D1 is too large, the amount of permanent magnet 220 is small, and the magnetic field energy of the motor is small. In order to achieve the required output power, more windings need to be wound on the stator 100 to compensate, so that the winding loss is high and the motor efficiency is low. In the present application, under the premise that the value of the maximum outer diameter D1 of the rotor 200 is between 71mm-75mm, the value of D2 / D1 satisfies between 0.77-0.82, which can make the magnetic field energy provided by the permanent magnet 220 more matched with the size of the stator 100, so that the magnetic circuit of the motor is more reasonable.

[0062] like Figure 2 As shown, the maximum radial thickness of the permanent magnet 220 is defined as H1, and the maximum radial thickness of the magnetizer 210 is defined as H2.

[0063] Combination Figure 2 and Figure 4 It can be understood that, along the radial direction of the magnetizer 210, the permanent magnet 220 has a first wall surface 221 and a second wall surface 222 that are arranged opposite to each other, wherein the first wall surface 221 is located on the side of the second wall surface 222 that is closer to the central axis of the magnetizer 210, that is, the first wall surface 221 is the side of the permanent magnet 220 facing the stator 100, and the second wall surface 222 is the side of the permanent magnet 220 facing away from the stator 100. When measuring H1, the position where the distance between the first wall surface 221 and the second wall surface 222 is the largest can be measured by using a vernier caliper.

[0064] Combination Figure 2 and Figure 3 Along the radial direction of the magnetizer 210, the magnetizer 210 has a third wall 211 and a fourth wall 212 which are arranged opposite to each other, wherein the third wall 211 is located on a side of the fourth wall 212 which is closer to the central axis of the magnetizer 210, that is, the third wall 211 is a side of the permanent magnet 220 facing the stator 100, and the fourth wall 212 is a side of the permanent magnet 220 facing away from the stator 100. When measuring H2, the position where the distance between the third wall 211 and the fourth wall 212 is the largest can be measured by using a vernier caliper.

[0065] It should be noted that 0.3≤H2 / H1≤0.5. Specifically, the value of H2 / H1 may be 0.3, 0.4 or 0.5.

[0066] It should be noted that, under the premise that the maximum outer diameter D1 of the rotor 200 is between 71 mm and 75 mm, the value of D2 / D1 is between 0.77 and 0.82, which can make the magnetic field energy provided by the permanent magnet 220 more matched with the size of the stator 100, thereby making the magnetic circuit of the motor more reasonable. At the same time, 0.3≤H2 / H1≤0.5 can further improve the efficiency of the motor.

[0067] It should be further explained that, under the premise that the maximum outer diameter D1 of the rotor 200 is limited to a value between 71mm and 75mm, and the value of D2 / D1 satisfies a value between 0.77 and 0.82, if the maximum radial thickness H2 of the magnetizer 210 is small, the magnetic field of the permanent magnet 220 will be more crowded when passing through the magnetizer 210, resulting in magnetic saturation, and ultimately leading to low motor efficiency; if the maximum radial thickness H2 of the magnetizer 210 is large, the amount of permanent magnet 220 will be small, resulting in a small magnetomotive force of the magnetic field, and the amount of winding needs to be increased on the stator 100 to compensate, resulting in large winding losses and low motor efficiency. In the present application, on the premise that the maximum outer diameter D1 of the rotor 200 is between 71 mm and 75 mm, the value of D2 / D1 is between 0.77 and 0.82, so that the magnetic field energy provided by the permanent magnet 220 is more matched with the size of the stator 100, thereby making the magnetic circuit of the motor more reasonable. At the same time, 0.3≤H2 / H1≤0.5 can further improve the efficiency of the motor.

[0068] Combination Figure 5 and Figure 6 , wherein, defined in the circumferential direction of the stator 100 , the maximum width of the stator tooth 112 is W.

[0069] It can be understood that, along the circumference of the stator 100, the stator tooth portion 112 has a fifth wall surface 1121 and a sixth wall surface 1122 that are arranged opposite to each other. When measuring W, the position where the distance between the fifth wall surface 1121 and the sixth wall surface 1122 is the largest can be measured by using a vernier caliper. In this embodiment, the fifth wall surface 1121 and the sixth wall surface 1122 of the stator tooth portion 112 are two parallel walls, that is, along the radial direction of the stator 100, the distance between the fifth wall surface 1121 and the sixth wall surface 1122 is the same at all locations. Of course, the parallelism of the fifth wall surface 1121 and the sixth wall surface 1122 can also be within the allowable error range.

[0070] It should be noted that 0.23≤W / (D1-D2)≤0.27. Specifically, the value of W / (D1-D2) may be 0.23, 0.24, 0.25, 0.26 or 0.27.

[0071] It should be noted that, on the premise that the maximum outer diameter D1 of the rotor 200 is between 71 mm and 75 mm, the value of D2 / D1 is satisfied between 0.77 and 0.82, which can make the magnetic field energy provided by the permanent magnet 220 more matched with the size of the stator 100, thereby making the magnetic circuit of the motor more reasonable. At the same time, 0.23≤W / (D1-D2)≤0.27 can further improve the efficiency of the motor. In addition, 0.3≤H2 / H1≤0.5 can further improve the efficiency of the motor.

[0072] It should be further explained that, under the premise that the maximum outer diameter D1 of the rotor 200 is limited to 71mm-75mm and the value of D2 / D1 is satisfied to be between 0.77-0.82, if the maximum width W of the stator tooth 112 is small, the magnetic field is more crowded when passing through, which ultimately makes the motor efficiency lower; if the maximum width W of the stator tooth 112 is large, it will lead to waste of magnetic circuit. At the same time, the large maximum width W of the stator tooth 112 will compress the winding area, so that the winding wire diameter needs to be reduced, the winding resistance increases, the loss increases accordingly, and the motor efficiency decreases. In the present application, on the premise that the maximum outer diameter D1 of the rotor 200 is between 71 mm and 75 mm, the value of D2 / D1 is satisfied between 0.77 and 0.82, so that the magnetic field energy provided by the permanent magnet 220 can be more matched with the size of the stator 100, thereby making the magnetic circuit of the motor more reasonable. At the same time, 0.23≤W / (D1-D2)≤0.27 can further improve the efficiency of the motor. In addition, 0.3≤H2 / H1≤0.5 can further improve the efficiency of the motor.

[0073] It should be noted that the efficiency of the motor varies through the synergistic effect of the dimensional parameters of each component. In the present application, on the premise that the maximum outer diameter D1 of the rotor 200 is limited to 71mm-75mm, the efficiency of the motor can be improved to a higher level by making 0.77≤D2 / D1≤0.82, 0.3≤H2 / H1≤0.5, and 0.23≤W / (D1-D2)≤0.27. The motor efficiency reaches a relatively high level when the maximum outer diameter D1 of the rotor 200 is limited to 71mm-75mm.

[0074] Combination Figure 5 and Figure 6 , wherein the maximum radial thickness of the stator yoke 111 is defined as H3.

[0075] It can be understood that the stator yoke 111 is a circular ring structure, and along the radial direction of the stator yoke 111, the stator yoke 111 has a seventh wall 1111 and an eighth wall 1112 that are arranged opposite to each other, wherein the seventh wall 1111 is located on a side of the eighth wall 1112 that is closer to the central axis of the stator yoke 111. When measuring H3, the measurement can be performed by using a vernier caliper at the position where the distance between the seventh wall 1111 and the eighth wall 1112 is the largest.

[0076] It should be noted that 0.14≤H3 / (D1-D2)≤0.17. Specifically, the value of H3 / (D1-D2) may be 0.14, 0.15, 0.16 or 0.17.

[0077] It should be noted that, based on the premise that the maximum outer diameter D1 of the rotor 200 is between 71 mm and 75 mm, the value of D2 / D1 is between 0.77 and 0.82, so that the magnetic field energy provided by the permanent magnet 220 can be more matched with the size of the stator 100, thereby making the magnetic circuit of the motor more reasonable. At the same time, 0.23≤W / (D1-D2)≤0.27, 0.3≤H2 / H1≤0.5 can further improve the efficiency of the motor. In addition, by making 0.14≤H3 / (D1-D2)≤0.17, the efficiency of the motor can be further improved.

[0078] It should be further explained that, when the maximum outer diameter D1 of the rotor 200 is limited to 71mm-75mm, the value of D2 / D1 is satisfied between 0.77-0.82, and 0.23≤W / (D1-D2)≤0.27, 0.3≤H2 / H1≤0.5 are satisfied. If the maximum radial thickness H3 of the stator yoke 111 is small, the magnetic field will be crowded when passing through, which will ultimately lead to lower motor efficiency; if the maximum radial thickness H3 of the stator yoke 111 is large, it will lead to waste of magnetic circuit. At the same time, the maximum radial thickness H3 of the stator yoke 111 is large, which will compress the winding area, so that the winding wire diameter needs to be reduced, the winding resistance increases, the loss increases accordingly, and the motor efficiency decreases. In the present application, the maximum outer diameter D1 of the rotor 200 is between 71 mm and 75 mm, and the value of D2 / D1 is between 0.77 and 0.82, so that the magnetic field energy provided by the permanent magnet 220 can be more matched with the size of the stator 100, thereby making the magnetic circuit of the motor more reasonable. At the same time, 0.23≤W / (D1-D2)≤0.27 and 0.3≤H2 / H1≤0.5 can further improve the efficiency of the motor. In addition, by satisfying 0.14≤H3 / (D1-D2)≤0.17, the efficiency of the motor can be further improved.

[0079] like Figure 5As shown, it can be understood that the stator core 110 further includes a plurality of pole shoe portions 113 , and the plurality of pole shoe portions 113 are connected one by one to an end of the plurality of stator teeth 112 away from the stator yoke portion 111 .

[0080] It should be noted that one end of each stator tooth 112 is connected to the outer peripheral wall of the stator yoke 111, and the other end of each stator tooth 112 faces away from the central axis of the stator yoke 111, and the plurality of pole shoes 113 are connected one-to-one to the ends of the plurality of stator teeth 112 away from the stator yoke 111. Specifically in this embodiment, the number of the pole shoes 113 is the same as that of the stator teeth 112, and the number of the pole shoes 113 and the number of the stator teeth 112 are both nine, and the nine pole shoes 113 are connected one-to-one to the ends of the nine stator teeth 112 away from the stator yoke 111.

[0081] Among them, along the circumference of the stator yoke 111, the pole shoe portion 113 protrudes from both sides of the stator tooth portion 112, so that the two ends of the pole shoe portion 113 can respectively protrude from the two sides of the stator tooth portion 112 arranged along the circumference of the stator yoke 111, so that when the stator tooth portion 112 is wound, the pole shoe portion 113 can limit the wire.

[0082] It can be understood that the pole shoe portion 113 and the stator tooth portion 112 can be an integral structure for easy manufacturing; the pole shoe portion 113 and the stator tooth portion 112 can also be in a detachable connection.

[0083] like Figure 6 As shown, the maximum radial thickness of the pole shoe portion 113 is defined as H4.

[0084] It can be understood that, along the radial direction of the stator yoke 111, the pole shoe portion 113 has a ninth wall 1131 and a tenth wall 1132 that are opposite to each other, wherein the ninth wall 1131 of the pole shoe portion 113 is closer to the central axis of the stator yoke 111 than the tenth wall 1132. When measuring H4, the vernier caliper can be used to measure the position where the distance between the ninth wall 1131 and the tenth wall 1132 is the largest.

[0085] It should be noted that the tenth wall surface 1132 of the pole shoe portion 113 is an arc surface, and the projections of the tenth wall surfaces 1132 of all the pole shoe portions 113 on the projection plane perpendicular to the rotation axis Z of the rotor 200 are on the same reference circle.

[0086] It should be noted that 0.55≤H4 / W≤0.59.

[0087] It should be noted that, based on the premise that the maximum outer diameter D1 of the rotor 200 is between 71 mm and 75 mm, the value of D2 / D1 is between 0.77 and 0.82, so that the magnetic field energy provided by the permanent magnet 220 can be more matched with the size of the stator 100, thereby making the magnetic circuit of the motor more reasonable. At the same time, 0.23≤W / (D1-D2)≤0.27, 0.3≤H2 / H1≤0.5 can further improve the efficiency of the motor. In addition, by making 0.55≤H4 / W≤0.59, the efficiency of the motor can be further improved.

[0088] It should be further explained that, when the maximum outer diameter D1 of the rotor 200 is limited to 71mm-75mm, the value of D2 / D1 is satisfied to be between 0.77-0.82, and 0.23≤W / (D1-D2)≤0.27, 0.3≤H2 / H1≤0.5 are satisfied, if the maximum radial thickness H4 of the pole shoe portion 113 is small, the magnetic field will be crowded when passing through, and ultimately the motor efficiency will be low; if the maximum radial thickness H4 of the pole shoe portion 113 is large, it will lead to waste of the magnetic circuit. At the same time, the large maximum radial thickness H4 of the pole shoe portion 113 will compress the winding area, so that the winding wire diameter needs to be reduced, the winding resistance increases, the loss increases accordingly, and the motor efficiency decreases. In the present application, the maximum outer diameter D1 of the rotor 200 is between 71 mm and 75 mm, and the value of D2 / D1 is between 0.77 and 0.82, so that the magnetic field energy provided by the permanent magnet 220 can be more matched with the size of the stator 100, thereby making the magnetic circuit of the motor more reasonable. At the same time, 0.23≤W / (D1-D2)≤0.27 and 0.3≤H2 / H1≤0.5 can further improve the efficiency of the motor. In addition, by satisfying 0.55≤H4 / W≤0.59, the efficiency of the motor can be further improved.

[0089] In the present application, on the premise that the maximum outer diameter D1 of the rotor 200 is limited to a value between 71 mm and 75 mm, by ensuring that 0.77≤D2 / D1≤0.82, 0.3≤H2 / H1≤0.5, 0.23≤W / (D1-D2)≤0.27, 0.14≤H3 / (D1-D2)≤0.17, and 0.55≤H4 / W≤0.59, the magnetic flux density level on the stator 100 can be maintained at the knee point of the material magnetization curve, thereby ensuring ultra-high utilization of the material's magnetic properties and improving the efficiency of the motor to an extremely high level, so that the motor efficiency reaches an extremely high level when the maximum outer diameter D1 of the rotor 200 is limited to a value between 71 mm and 75 mm.

[0090] It should be noted that the stator core 110 includes a plurality of stacked silicon steel sheets. Specifically, the stator core 110 is formed by stacking a plurality of silicon steel sheets, wherein the maximum thickness of the silicon steel sheets is between 0.18 mm and 0.22 mm. It is understood that the maximum thickness of the silicon steel sheets may be 0.18 mm, 0.19 mm, 0.20 mm, 0.21 mm or 0.22 mm, wherein the maximum thickness of the silicon steel sheets may be measured using a vernier caliper at the maximum thickness of the silicon steel sheets.

[0091] Combination Figure 2 and Figure 4 The first wall surface 221 of the permanent magnet 220 can be an arc surface, other curved surfaces or a plane, and an air gap 300 is formed between the first wall surface 221 of the permanent magnet 220 and the eighth wall surface 1112 of the pole shoe portion 113. Generally speaking, the second wall surface 222 of the permanent magnet 220 is also an arc surface or a curved surface of other shapes.

[0092] The first wall surface 221 includes a first arc surface 2211 , a second arc surface 2212 and a third arc surface 2213 , and the second arc surface 2212 and the third arc surface 2213 are respectively connected to two sides of the first arc surface 2211 along the circumferential direction of the rotor 200 .

[0093] It can be understood that, along the circumference of the rotor 200, the first arc surface 2211 is located between the second arc surface 2212 and the third arc surface 2213. In addition, on the projection surface perpendicular to the rotation axis Z of the rotor 200, the first arc surface 2211, the second arc surface 2212 and the third arc surface 2213 are all arcs, and the arc formed by the projection of the second arc surface 2212 on the projection surface perpendicular to the rotation axis Z of the rotor 200, the arc formed by the projection of the first arc surface 2211 on the projection surface perpendicular to the rotation axis Z of the rotor 200, and the arc formed by the projection of the third arc surface 2213 on the projection surface perpendicular to the rotation axis Z of the rotor 200 are connected in sequence.

[0094] The distance L2 between the second arc surface 2212 and the central axis of the magnet 210 , and the distance L3 between the third arc surface 2213 and the central axis of the magnet 210 are both greater than the distance L1 between the first arc surface 2211 and the central axis of the magnet 210 .

[0095] It can be understood that the distance between the arc formed by the second arc surface 2212 projected on the projection plane perpendicular to the rotation axis Z of the rotor 200 and the central axis of the magnet 210, and the distance between the arc formed by the third arc surface 2213 projected on the projection plane perpendicular to the rotation axis Z of the rotor 200 and the central axis of the magnet 210 are both greater than the distance between the arc formed by the first arc surface 2211 projected on the projection plane perpendicular to the rotation axis Z of the rotor 200 and the central axis of the magnet 210.

[0096] It should be noted that the permanent magnet 220 is an axisymmetric structure, and the permanent magnet 220 has a symmetric center line, which extends along the radial direction of the magnetizer 210 and intersects with the central axis of the magnetizer 210, that is, the symmetric center line of the permanent magnet 220 is perpendicular to the central axis of the magnetizer 210, and the permanent magnet 220 is symmetrically arranged about its own symmetric center line. On the projection plane perpendicular to the rotation axis Z of the rotor 200, from the symmetric center line of the permanent magnet 220 to both sides along the circumferential direction of the magnetizer 210, the distance from the projection of the first wall surface 221 to the rotation axis Z of the rotor 200 increases.

[0097] like Figure 4 As shown, it can be understood that the distance between the second arc surface 2212 and the central axis of the magnet 210 gradually increases along the first direction, and the distance between the third arc surface 2213 and the central axis of the magnet 210 gradually increases along the second direction; wherein the first direction is the direction from the first arc surface 2211 to the second arc surface 2212, and the second direction is the direction from the first arc surface 2211 to the third arc surface 2213. In this way, the air gap inside the second arc surface 2212 and the third arc surface 2213 will be larger than the air gap inside the first arc surface 2211, making the magnetic field distribution in the air gap 300 more sinusoidal, thereby reducing the vibration noise of the motor.

[0098] It can be further understood that the distance from the first wall 221 to the second wall 222 of the permanent magnet 220 is the thickness of the permanent magnet 220. From the symmetric center line of the permanent magnet 220 to the two sides along the circumference of the magnetizer 210, the thickness of the permanent magnet 220 decreases, that is, the permanent magnet 220 has a large thickness in the middle and a small thickness at both ends along the circumference of the magnetizer 210. In this way, the magnetic flux of the magnetic field of the permanent magnet 220 is concentrated in the middle position of the permanent magnet 220, and the magnetic flux distribution is optimized. In space, the magnetic flux distribution is made closer to a sine waveform, which can reduce the harmonic component of the magnetic density of the air gap 300, reduce iron loss, and thus reduce the magnetic resistance torque and cogging torque, thereby achieving the improvement of the output torque and efficiency of the motor, and improving the running stability of the motor and reducing noise.

[0099] In the motor of the present application, the value of the maximum outer diameter D1 of the rotor 200 is between 71mm-75mm, and the value of D2 / D1 is between 0.77-0.82, so that the magnetic field energy provided by the permanent magnet 220 can be more matched with the size of the stator 100, thereby making the magnetic circuit of the motor more reasonable. In addition, 0.3≤H2 / H1≤0.5, 0.23≤W / (D1-D2)≤0.27, 0.14≤H3 / (D1-D2)≤0.17, 0.55≤H4 / W≤0.59 are satisfied at the same time, so that the magnetic density level on the stator 100 can be maintained at the knee point of the material magnetization curve, thereby ensuring the ultra-high utilization rate of the magnetic properties of the material, and improving the efficiency of the motor to an extremely high level, so that the motor efficiency reaches an extremely high level when the maximum outer diameter D1 of the rotor 200 is limited to between 71mm-75mm.

[0100] The present application also provides an electrical device, including the motor of the present application, wherein the electrical device may be a fan, an air-conditioning compressor, a refrigerator compressor, a drum washing machine, etc.

[0101] Since the electrical equipment adopts all the technical solutions of the motor of the above embodiment, in the motor, the value of D2 / D1 satisfies 0.77-0.82, based on the premise that the maximum outer diameter D1 of the rotor 200 is between 71mm-75mm, so that the magnetic field energy provided by the permanent magnet 220 is more matched with the size of the stator 100, so that the magnetic circuit of the motor is more reasonable. In addition, 0.3≤H2 / H1≤0.5, 0.23≤W / (D1-D2)≤0.27, 0.14≤H3 / (D1-D2)≤0.17, 0.55≤H4 / W≤0.59 are satisfied at the same time, so that the magnetic density level on the stator 100 can be kept at the knee point of the material magnetization curve, thereby ensuring the ultra-high utilization rate of the magnetic properties of the material, and improving the efficiency of the motor to an extremely high level, so that the motor efficiency reaches an extremely high level when the maximum outer diameter D1 of the rotor 200 is limited to between 71mm-75mm.

[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 stator, comprising a stator core, wherein the stator core comprises a stator yoke and a plurality of stator teeth, wherein the plurality of stator teeth are connected to the outer side of the stator yoke and are arranged at intervals along the circumference of the stator yoke; The rotor comprises a magnetizer and a plurality of permanent magnets, wherein the magnetizer is wound around the outer circumference of the stator, and the plurality of permanent magnets are connected to the inner side of the magnetizer and are spaced apart along the circumference of the magnetizer; Among them, the maximum outer diameter of the rotor is D1, the maximum outer diameter of the stator is D2, the maximum radial thickness of the permanent magnet is H1, the maximum radial thickness of the magnetizer is H2, and the maximum width of the stator teeth is W; satisfying: 71mm≤D1≤75mm, 0.77≤D2 / D1≤0.82, 0.3≤H2 / H1≤0.5, 0.23≤W / (D1-D2)≤0.

27.

2. The motor according to claim 1, characterized in that: The maximum radial thickness of the stator yoke is H3, which satisfies: 0.14≤H3 / (D1-D2)≤0.

17.

3. The motor according to claim 1 or 2, characterized in that: The stator core further comprises a plurality of pole shoes, and the plurality of pole shoes are connected one by one to one ends of the plurality of stator teeth away from the stator yoke; The maximum radial thickness of the pole shoe portion is H4, which satisfies: 0.55≤H4 / W≤0.

59.

4. The motor according to claim 1, characterized in that: The permanent magnet has a first arc surface, a second arc surface and a third arc surface on one side close to the stator, and the second arc surface and the third arc surface are respectively connected to two sides of the first arc surface along the circumferential direction of the rotor; Wherein, the distance between the second arc surface and the central axis of the magnetizer, and the distance between the third arc surface and the central axis of the magnetizer, are both greater than the distance between the first arc surface and the central axis of the magnetizer.

5. The motor according to claim 4, characterized in that: The distance between the second arc surface and the central axis of the magnetic conductor gradually increases along the first direction, and the distance between the third arc surface and the central axis of the magnetic conductor gradually increases along the second direction; The first direction is a direction from the first arc surface to the second arc surface, and the second direction is a direction from the first arc surface to the third arc surface.

6. The motor according to claim 1, characterized in that: The permanent magnet is an axisymmetric structure and has a symmetric center line, which extends along the radial direction of the magnetizer and intersects with the central axis of the magnetizer.

7. The motor according to claim 1, characterized in that: The number of the permanent magnets is greater than the number of the stator teeth.

8. The motor according to claim 1, characterized in that: The stator core includes a plurality of stacked silicon steel sheets, and the maximum thickness of the silicon steel sheets is between 0.18 mm and 0.22 mm.

9. The motor according to claim 1, characterized in that: The plurality of stator teeth are evenly and spaced apart along the circumferential direction of the stator yoke, and / or the plurality of permanent magnets are evenly and spaced apart along the circumferential direction of the magnetizer.

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

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