Motor, fan and electrical equipment

Abstract

The utility model discloses a motor, fan and electrical equipment, the motor comprises a stator assembly and a rotor assembly, the stator assembly comprises a stator iron core, the stator iron core comprises a stator yoke part and a plurality of stator teeth, and the plurality of stator teeth are connected to the inner circumferential wall of the stator yoke part and are arranged at intervals along the circumferential direction of the stator iron core; the rotor assembly comprises a rotor iron core and a plurality of permanent magnets; wherein the minimum outer diameter of the stator iron core is D1, the minimum inner diameter of the stator iron core is D2, the maximum outer diameter of the rotor iron core is D3, the minimum inner diameter of the rotor iron core is D4, and the coefficient K meets the following conditions. The motor provided by the utility model can improve the no-load back electromotive force, reduce the loss, improve the operation efficiency, and reduce the production cost at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, especially a kind of motor, fan and electrical equipment. BACKGROUND

[0002] With the performance improvement of electrical equipment, the performance requirement of motor in electrical equipment is also higher and higher.For motor, the output performance of motor is closely related to the radial dimension of stator and rotor.In order to improve the output performance of motor, in the related art, the radial dimension of stator and rotor is increased, however, it will cause the increase of loss, the decrease of efficiency, the increase of material consumption and the increase of cost.Therefore, how to balance the output performance of motor and production cost is still a problem to be solved. SUMMARY

[0003] The utility model at least solves one of the technical problems in the prior art.For this purpose, the utility model provides a motor, which can improve no-load back electromotive force, reduce loss, improve operating efficiency, and reduce production cost.

[0004] The utility model further provides a fan and an electrical equipment with the motor.

[0005] According to the motor of the first aspect of the utility model, the motor comprises a stator assembly, a rotor assembly and a plurality of windings, the stator assembly comprises a stator core and a plurality of stator teeth, the stator core is annular and is provided with an inner hole, the stator core comprises a stator yoke portion and a plurality of stator teeth, the plurality of stator teeth are connected to the inner peripheral wall of the stator yoke portion and are arranged at intervals along the circumferential direction of the stator core, and the plurality of windings are wound around the plurality of stator teeth respectively; the rotor assembly is rotatably arranged in the inner hole, and the rotor assembly comprises a rotor core and a plurality of permanent magnets, the rotor core is provided with a plurality of mounting grooves arranged at intervals along the circumferential direction, and the plurality of permanent magnets are correspondingly mounted in the plurality of mounting grooves; wherein the minimum outer diameter of the stator core is D1, the minimum inner diameter of the stator core is D2, the maximum outer diameter of the rotor core is D3, the minimum inner diameter of the rotor core is D4, and the coefficient K satisfies:

[0006] .

[0007] According to the motor of the first aspect of the utility model, the motor has at least the following beneficial effects: by adjusting and optimizing the minimum outer diameter D1 of the stator core, the minimum inner diameter D2 of the stator core, the maximum outer diameter D3 of the rotor core and the minimum inner diameter D4 of the rotor core, the ratio relationship between the thickness dimension of the motor in the radial direction and the armature diameter is optimized, the no-load back electromotive force of the motor is improved, the loss is reduced, the operating efficiency is improved, the output performance of the motor is improved, the material consumption is saved, and the production cost is reduced. ​

[0008] According to some embodiments of the present application, the minimum inner diameter D2 of the stator core satisfies: 58mm≤D2≤62mm.

[0009] According to some embodiments of the present application, the number of the stator teeth is N, the stator tooth comprises a tooth portion and a tooth shoe, the tooth portion is connected to the inner peripheral wall of the stator yoke portion and is arranged to extend towards the center of the stator core, the tooth shoe is connected to one end of the tooth portion away from the stator yoke portion and is arranged to protrude along the circumferential direction towards both sides of the tooth portion, the minimum tooth width of the tooth portion is W, along the radial direction of the stator core, the length of the tooth portion is L, the minimum thickness of the stator yoke portion is H, along the circumferential direction, a wire slot is defined between two adjacent stator teeth, the simplified cross-sectional area of the wire slot is S1, the cross-sectional area of the permanent magnet is S2, and it satisfies: 2.6≤S2 / S1≤3.3.

[0010] wherein, , .

[0011] According to some embodiments of the present application, the rotor core comprises a plurality of core units arranged at intervals along the circumferential direction, the maximum distance of the two sides of the core unit away from each other along the circumferential direction is c, the mounting slot is defined between two adjacent core units, the simplified cross-sectional area of the core unit is S3, the cross-sectional area of the permanent magnet is S2, and it satisfies: 0.75≤S2 / S3≤1.5, wherein, .

[0012] According to some embodiments of the present application, the stator tooth comprises a tooth portion and a tooth shoe, the tooth portion is connected to the inner peripheral wall of the stator yoke portion and is arranged to extend towards the center of the stator core, the tooth shoe is connected to one end of the tooth portion away from the stator yoke portion and is arranged to protrude along the circumferential direction towards both sides of the tooth portion, the minimum tooth width of the tooth portion is W, along the radial direction of the stator core, the minimum thickness of the stator yoke portion is H, and it satisfies: 1.5≤W / H≤2.2.

[0013] According to some embodiments of the present application, the stator yoke portion comprises a plurality of yoke portion units arranged in sequence along the circumferential direction, a splicing structure is arranged between at least one pair of adjacent yoke portion units, a bending portion is connected between every other adjacent yoke portion unit, and a plurality of stator teeth are respectively connected to a plurality of yoke portion units.

[0014] According to some embodiments of the present application, the rotor core comprises a plurality of core units arranged at intervals along the circumferential direction, and two adjacent core units are disconnected from each other.

[0015] According to some embodiments of the utility model, the rotor assembly further includes an inner core, the inner core is arranged in a space surrounded by the plurality of core units, and the inner core and the plurality of core units are disconnected from each other.

[0016] According to the fan of the second aspect of the utility model, the fan has at least the following beneficial effects: the fan adopts the motor, the minimum outer diameter D1 of the stator core, the minimum inner diameter D2 of the stator core, the maximum outer diameter D3 of the rotor core and the minimum inner diameter D4 of the rotor core are adjusted and optimized to meet

[0017] According to the fan of the second aspect of the utility model, the fan has at least the following beneficial effects: the fan adopts the motor, the minimum outer diameter D1 of the stator core, the minimum inner diameter D2 of the stator core, the maximum outer diameter D3 of the rotor core and the minimum inner diameter D4 of the rotor core are adjusted and optimized to meet , that is, the ratio between the thickness size of the motor in the radial direction and the armature diameter is optimized, the no-load back electromotive force of the motor is improved, the loss is reduced, the operating efficiency is improved, the output performance of the motor is improved, the material consumption is saved, and the production cost is reduced.

[0018] According to the electric appliance of the third aspect of the utility model, the electric appliance has at least the following beneficial effects: the electric appliance adopts the fan, the minimum outer diameter D1 of the stator core, the minimum inner diameter D2 of the stator core, the maximum outer diameter D3 of the rotor core and the minimum inner diameter D4 of the rotor core are adjusted and optimized to meet

[0019] According to the electric appliance of the third aspect of the utility model, the electric appliance has at least the following beneficial effects: the electric appliance adopts the fan, the minimum outer diameter D1 of the stator core, the minimum inner diameter D2 of the stator core, the maximum outer diameter D3 of the rotor core and the minimum inner diameter D4 of the rotor core are adjusted and optimized to meet , that is, the ratio between the thickness size of the motor in the radial direction and the armature diameter is optimized, the no-load back electromotive force of the motor is improved, the loss is reduced, the operating efficiency is improved, the output performance of the motor is improved, the material consumption is saved, and the production cost is reduced.

[0020] Additional aspects and advantages of the utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be further explained in combination with the drawings and embodiments, wherein:

[0022] Figure 1 is the cross-sectional view of the motor in the utility model embodiment (one of the permanent magnets is hidden);

[0023] Figure 2 is the partial cross-sectional view of the stator core in the utility model embodiment;

[0024] Figure 3 is a sectional view of a permanent magnet in the embodiment of the utility model;

[0025] Figure 4 is a sectional view of a core unit in the embodiment of the utility model;

[0026] Figure 5 is a curve graph of the change of the unit value of the no-load back EMF with K value and the change of the operation efficiency of the motor with K value in the embodiment of the utility model;

[0027] Figure 6 is a surface graph of the change of the efficiency of the motor with the value of S2 / S1 and the value of S2 / S3 in the embodiment of the utility model;

[0028] Figure 7 is a curve contrast graph of the change of the output torque of the motor and the output torque of the motor of the prior art with input current in the embodiment of the utility model.

[0029] Reference signs:

[0030] Stator assembly 100;Stator core 110;Stator yoke 111;Yoke unit 1111;Splicing structure 1112;Bent part 1113;Stator tooth 112;Tooth part 1121;Tooth shoe 1122;Winding slot 113;

[0031] Rotor assembly 200;Rotor core 210;Core unit 211;Outer magnetic bridge 2111;Inner magnetic bridge 2112;Mounting groove 212;Permanent magnet 220;Inner core 230;Air gap 240. DETAILED DESCRIPTION

[0032] The embodiments of the utility model are described in detail below, examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.

[0033] In the description of the utility model, it is understood that the orientation description, such as up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and is not indicative or implied that the indicated device or element must have a specific orientation, a specific orientation and operation, therefore, it cannot be understood as limiting the utility model.

[0034] In the description of the utility model, if several meanings are one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. Understand as not including the number, above, below, within, etc. Understand as including the number. If there is a description to the first, second, only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of the indicated technical features.

[0035] In the description of the utility model, unless otherwise explicitly limited, the words of setting, installation, connection, assembly, cooperation and the like should be understood broadly, and the skilled person in the art can determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.

[0036] Referring to Figures 1 to 7 The utility model discloses a motor, applied to electric appliance, and electric appliance can be air conditioner, fresh air machine and the like. For example, the motor is applied to the fan of air conditioner, and is used as the power source of fan to satisfy the fan to realize the air supply function.

[0037] The structure of the motor is described in detail below.

[0038] Referring to Figure 1 It can be understood that the motor includes a stator assembly 100 and a rotor assembly 200. The stator assembly 100 and the rotor assembly 200 are annular, and the stator assembly 100 is arranged around the outer periphery of the rotor assembly 200, and the inner periphery wall of the stator assembly 100 is arranged at intervals with the outer periphery wall of the rotor assembly 200 and forms an air gap 240. That is, the motor is an inner rotor structure.

[0039] Referring to Figure 1As shown, it can be understood that the stator assembly 100 comprises a stator core 110 and a plurality of windings. Among them, the stator core 110 is annular in shape as a whole, and generally speaking, the stator core 110 is composed of a plurality of stator laminations arranged in a stacked manner along the direction of the central axis of the stator core 110. The stator core 110 comprises a stator yoke 111 and a plurality of stator teeth 112, the stator yoke 111 is annular, the plurality of stator teeth 112 are connected to the inner peripheral wall of the stator yoke 111 and are respectively arranged in a manner extending along the radial direction of the stator core 110 towards the central axis of the stator core 110, and the plurality of stator teeth 112 are arranged at equal intervals along the circumferential direction of the stator core 110. In this way, the space on the side of the plurality of stator teeth 112 close to the central axis of the stator core 110 forms the inner hole of the stator core 110. It is easy to understand that the direction of the central axis of the stator core 110 is the axial direction of the stator core 110, the direction around the central axis of the stator core 110 is the circumferential direction of the stator core 110, and the direction perpendicular to the central axis of the stator core 110 and pointing outward from the central axis of the stator core 110 and its reverse direction are the radial direction of the stator core 110. Along the radial direction of the stator core 110, the side close to the central axis of the stator core 110 is the inner side, and the side away from the central axis of the stator core 110 is the outer side.

[0040] Referring to Figure 1 As shown, it can be understood that the stator assembly 100 comprises a stator core 110 and a plurality of windings. Among them, the stator core 110 is annular in shape as a whole, and generally speaking, the stator core 110 is composed of a plurality of stator laminations arranged in a stacked manner along the direction of the central axis of the stator core 110. The stator core 110 comprises a stator yoke 111 and a plurality of stator teeth 112, the stator yoke 111 is annular, the plurality of stator teeth 112 are connected to the inner peripheral wall of the stator yoke 111 and are respectively arranged in a manner extending along the radial direction of the stator core 110 towards the central axis of the stator core 110, and the plurality of stator teeth 112 are arranged at equal intervals along the circumferential direction of the stator core 110. In this way, the space on the side of the plurality of stator teeth 112 close to the central axis of the stator core 110 forms the inner hole of the stator core 110. It is easy to understand that the direction of the central axis of the stator core 110 is the axial direction of the stator core 110, the direction around the central axis of the stator core 110 is the circumferential direction of the stator core 110, and the direction perpendicular to the central axis of the stator core 110 and pointing outward from the central axis of the stator core 110 and its reverse direction are the radial direction of the stator core 110. Along the radial direction of the stator core 110, the side close to the central axis of the stator core 110 is the inner side, and the side away from the central axis of the stator core 110 is the outer side.

[0041] Referring to Figure 1 As shown, it can be understood that the stator assembly 100 is arranged around the outer periphery of the rotor assembly 200, that is, the rotor assembly 200 is arranged in the inner hole of the stator core 110, and the rotor assembly 200 can rotate relative to the stator assembly 100. Specifically, the rotor assembly 200 comprises a rotor core 210 and a plurality of permanent magnets 220, wherein the rotor core 210 is composed of a plurality of core units 211, the outer contour of the core unit 211 is substantially fan-shaped, and the small end of the fan-shaped core unit 211 is closer to the central axis of the stator core 110 than the large end. The plurality of core units 211 are arranged at equal intervals along the circumferential direction of the stator core 110, and the adjacent two core units 211 define a mounting groove 212, the number of mounting grooves 212 is equal to the number of core units 211, and the number of mounting grooves 212 and the number of core units 211 are equal to the number of permanent magnets 220. The plurality of permanent magnets 220 are respectively installed in the plurality of mounting grooves 212.

[0042] Referring to Figure 1As shown, it can be understood that in the present example, the motor is twelve-slot ten-pole, that is, the number of winding slots 113 is twelve, and the number of permanent magnets 220 is ten.

[0043] Of course, the slot-pole number of the motor is not limited to twelve-slot ten-pole, and other slot-pole combinations are also possible, which will not be described here.

[0044] Referring to Figure 1 As shown, the minimum 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. In the present embodiment, the outer contour of the stator core 110 is a regular polygon, the number of sides is equal to the number of winding slots 113, and is an even number, that is, the number of stator teeth 112 is also an even number, and the inner wall surface of the stator tooth 112 is an arc surface. In the projection plane perpendicular to the central axis of the stator core 110, the minimum outer diameter D1 of the stator core 110 is the distance between the two line segments of the outer contour of the stator core 110 that are symmetrically arranged about the center of the central axis of the stator core 110, and the minimum inner diameter D2 of the stator core 110 is the minimum distance of the line segment that passes through the center of the stator core 110 (i.e., the projection of the central axis) and extends to the projection of the inner wall surface of the two stator teeth 112 symmetrically arranged about the center of the central axis of the stator core 110.

[0045] Referring to Figure 1 As shown, 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. In the present embodiment, the number of core units 211 is an even number. In the projection plane perpendicular to the central axis of the rotor core 210, the maximum outer diameter D3 of the rotor core 210 is the maximum distance of the line segment that passes through the center of the rotor core 210 (i.e., the projection of the central axis) and extends to the projection of the outer wall surface of the two core units 211 symmetrically arranged about the center of the central axis of the rotor core 210, and the minimum inner diameter D4 of the rotor core 210 is the minimum distance of the line segment that passes through the center of the rotor core 210 (i.e., the projection of the central axis) and extends to the projection of the inner wall surface of the two core units 211 symmetrically arranged about the center of the central axis of the rotor core 210.

[0046] That is, the minimum outer diameter D1 of the stator core 110 is the minimum value of the outer diameters at all places of the stator core 110, the minimum inner diameter D2 of the stator core 110 is the minimum value of the inner diameters at all places of the stator core 110, the maximum outer diameter D3 of the rotor core 210 is the maximum value of the outer diameters at all places of the rotor core 210, and the minimum inner diameter D4 of the rotor core 210 is the minimum value of the inner diameters at all places of the rotor core 210.

[0047] Referring to Figure 1As shown, it can be understood that the coefficient K, the minimum outer diameter D1 of the stator core 110, the minimum inner diameter D2 of the stator core 110, the maximum outer diameter D3 of the rotor core 210 and the minimum inner diameter D4 of the rotor core 210 satisfy:

[0048] .

[0049] It can be understood that the thickness dimension of the motor in the radial direction is defined as the distance between the outer profile of the stator core 110 and the inner profile of the rotor core 210 in the radial direction, that is, The armature diameter of the motor is defined as the diameter of a circle with the center axis of the stator core 110 in the axial direction as the center and the distance between the center and the middle point of the air gap 240 in the radial direction as the radius, and the value of the armature diameter is .

[0050] It can be understood that which is positively correlated with the area size of the region between the outer profile of the stator core 110 and the inner profile of the rotor core 210, that is, it can reflect the thickness dimension of the motor in the radial direction to some extent, and is positively correlated.

[0051] It can be understood that which is positively correlated with the area size of the circle in which the armature diameter is located, that is, it can reflect the size of the armature diameter to some extent, and is positively correlated.

[0052] Therefore, that is, K can reflect the proportional relationship between the thickness dimension of the motor in the radial direction and the armature diameter to some extent.

[0053] When K≤1.35, the value of is certain, that is, the armature diameter is unchanged, the value of the thickness dimension of the motor in the radial direction is too small, the amount of the winding and the amount of the permanent magnet 220 are too small, that is, the number of turns of the winding and the magnetic flux of the permanent magnet 220 are too small, resulting in too small no-load back EMF of the motor; or the value of is certain, that is, the thickness dimension of the motor in the radial direction is unchanged, the value of the thickness dimension of the motor in the radial direction is too large, resulting in too small thickness dimension of the stator core 110 in the radial direction , the magnetic flux of the stator core 110 is prone to saturation, and the number of turns of the winding decreases, while the thickness dimension of the rotor core 210 in the radial direction is too large, the amount of the permanent magnet 220 increases but the utilization rate decreases, thereby resulting in the decrease of the output torque of the motor and the decrease of the no-load back EMF; or the value is too small, and the value is too large, which can be referred to the above description, and will not be described here.

[0054] When K ≥ 1.75, in Given a fixed value, i.e., the armature diameter remains constant, The value is too large, meaning the radial thickness of the motor is too large, the amount of windings and permanent magnet 220 is too large, increasing the cost; or in Given a fixed value, that is, with the radial thickness of the motor remaining constant, The value is too small; the radial thickness of rotor core 210 If the size is too small, the magnetic flux of the rotor core 210 is prone to saturation, the utilization of the permanent magnet 220 decreases, and the radial thickness of the stator core 110 is also affected. If the number of turns in the winding is too large, the utilization rate decreases, resulting in a decrease in the motor's output torque and a decrease in the no-load back EMF; or... The value is too large, and at the same time The value is too small; please refer to the above explanation, which will not be repeated here.

[0055] It is easy to understand that the no-load back EMF is positively correlated with the product of the number of turns of the winding and the magnetic flux of the permanent magnet 220.

[0056] Therefore, by ensuring that 1.35 ≤ K ≤ 1.75, for example, K values ​​of 1.35, 1.38, 1.4, 1.47, 1.6, 1.69, or 1.74, the minimum outer diameter D1 and minimum inner diameter D2 of the stator core 110, the maximum outer diameter D3 and minimum inner diameter D4 of the rotor core 210 are adjusted and optimized. This optimizes the ratio between the motor's radial thickness and the armature diameter. While maintaining the motor's output torque, the number of winding turns and the magnetic flux of the permanent magnet 220 are optimized, and the utilization rate of the windings and permanent magnet 220 is improved. This increases the motor's no-load back EMF by approximately 32%, while simultaneously reducing material usage and lowering costs by approximately 20%.

[0057] It is easy to understand that the output torque of a motor is positively correlated with the product of the no-load back EMF and the input current.

[0058] Given a fixed output torque, increasing the no-load back EMF reduces the input current, thereby lowering losses and improving the motor's operating efficiency, ultimately enhancing its output performance.

[0059] Reference Figure 5As shown in the figure, the figure shows the curve of the unit value of the no-load back electromotive force changing with the value of K and the curve of the operating efficiency of the motor changing with the value of K. The unit value of the no-load back electromotive force is the relative value under the benchmark that the no-load back electromotive force of the prior art is 1. As can be seen from the two curves, with the increase of the value of K, the unit value of the no-load back electromotive force and the operating efficiency of the motor both first increase and then decrease, and when the value of K is about 1.55, the unit value of the no-load back electromotive force and the operating efficiency of the motor both reach the maximum value. When 1.35≤K≤1.75, the unit value of the no-load back electromotive force and the operating efficiency of the motor are both relatively large, wherein the unit value of the no-load back electromotive force is about 1.15-1.3, and the operating efficiency of the motor is about 69%-73.5%. That is to say, 1.35≤K≤1.75 can effectively improve the no-load back electromotive force and the operating efficiency of the motor.

[0060] In other embodiments, the outer contour of the stator core 110 can also be a polygonal shape (the outer contour is provided with a recess), a circular shape, a closed loop formed by connecting a plurality of arc segments, etc.

[0061] It can be understood that the stator punching sheets constituting the stator core 110 are punched from sheet materials such as silicon steel plates. The shape of the stator punching sheets punched can be annular, and the annular stator core 110 can be obtained by corresponding stacking of a plurality of annular stator punching sheets in the thickness direction. Alternatively, the shape of the stator punching sheets punched can be chain-shaped, and the annular stator core 110 can be obtained by corresponding stacking of a plurality of chain-shaped stator punching sheets in the thickness direction to obtain a chain structure, and then bending the chain structure into an annular shape with the head and tail abutting.

[0062] It can be understood that in the present embodiment, the stator punching sheets punched are chain-shaped. Therefore, when the material is arranged, the chain-shaped stator punching sheets are arranged in a straight line on the sheet material such as a silicon steel plate, which can optimize the layout of the material, reduce waste, improve the material utilization rate of the sheet material, and thus reduce the material cost.

[0063] Referring to Figure 1 and Figure 2 , specifically, in the stator core 110 composed of chain-shaped stator punching sheets, the stator yoke portion 111 includes a plurality of yoke units 1111, the number of yoke units 1111 is equal to the number of stator teeth 112, and the plurality of yoke units 1111 are arranged in sequence along the circumferential direction of the stator core 110 and form an annular shape. The plurality of stator teeth 112 are respectively connected to the wall surfaces of the plurality of yoke units 1111 on the side of the central axis of the stator core 110.

[0064] Continuing to refer to Figure 1 and Figure 2It can be understood that at least one splicing structure 1112 is arranged between two adjacent yoke units 1111, and one bending part 1113 is connected between each of the remaining two adjacent yoke units 1111. Specifically, in the embodiment, the stator core 110 is composed of a chain structure, and after the chain structure is assembled into a ring shape, the first and last two yoke units 1111 are butted through the splicing structure 1112. The splicing structure 1112 can be a dovetail groove structure, a concave-convex matching structure, etc. The remaining two adjacent yoke units 1111 are connected by a bending part 1113, and the bending part 1113 allows the two adjacent yoke units 1111 to be bent relative to each other in a direction perpendicular to the central axis of the stator core 110, so that the chain structure can be bent into a ring-shaped stator core 110, facilitating production.

[0065] Of course, the stator core 110 is composed of a plurality of chain structures which are sequentially spliced into a ring shape, and the adjacent two chain structures are butted through the splicing structure 1112. In each chain structure, a bending part 1113 is connected between each of the two adjacent yoke units 1111, which will not be described here.

[0066] Referring to Figure 1 It can be understood that the minimum inner diameter D2 of the stator core 110 satisfies: 58mm≤D2≤62mm. For example, D2 is 58mm, 59mm, 59.5mm, 61.3mm or 62mm, etc. Under the premise that the width of the air gap 240 in the radial direction is constant, the minimum inner diameter D2 of the stator core 110 is large, so that the motor has a large armature diameter, thereby increasing the thickness dimension of the rotor core 210 in the radial direction , reducing the saturation degree of the rotor core 210, increasing the amount of permanent magnets 220, and thereby increasing the output torque and no-load back EMF of the motor, i.e. improving the output performance of the motor.

[0067] It is easy to understand that, due to the increase in the amount of permanent magnets 220, the magnetic field stability of the permanent magnets 220 is high, the anti-demagnetization ability is enhanced, and the demagnetization current required for the permanent magnets 220 to demagnetize is large, which realizes a demagnetization current increase of about 30%, which is beneficial to improve the demagnetization performance of the motor.

[0068] Referring to Figure 2 It can be understood that the stator tooth 112 includes a tooth part 1121 and a tooth shoe 1122, wherein the tooth part 1121 is connected to the inner peripheral wall of the stator yoke part 111 and is arranged in the radial direction towards the center of the stator core 110, and the tooth shoe 1122 is connected to one end of the tooth part 1121 away from the stator yoke part 111, and the tooth shoe 1122 is arranged protruding along the circumferential direction of the stator core 110 towards both sides of the tooth part 1121.

[0069] Referring to Figure 2As shown, it can be understood that the minimum tooth width of the tooth portion 1121 is defined as W, and the length of the tooth portion 1121 along the radial direction of the stator core 110 is defined as L. W is the minimum distance between the two wall surfaces of the tooth portion 1121 facing away from each other along the circumferential direction of the stator core 110, and generally, the two wall surfaces of the tooth portion 1121 facing away from each other along the circumferential direction of the stator core 110 are parallel. L is the distance between the two ends of the tooth portion 1121 along the radial direction of the stator core 110 in the radial direction.

[0070] Referring to Figure 2 As shown, it can be understood that the minimum thickness of the stator yoke portion 111 along the radial direction of the stator core 110 is defined as H, and H is the minimum thickness of the yoke unit 1111, that is, the minimum distance between the two wall surfaces of the yoke unit 1111 facing away from each other along the radial direction of the stator core 110, and generally, the two wall surfaces of the yoke unit 1111 facing away from each other along the radial direction of the stator core 110 are parallel.

[0071] Referring to Figure 2 As shown, it can be understood that the number of the stator teeth 112 is defined as N. In the projection plane perpendicular to the central axis of the rotor core 210, the angle between the line connecting the projection midpoint of one of the two wall surfaces of the tooth portion 1121 facing away from each other along the circumferential direction of the stator core 110 and the projection of the central axis of the stator core 110 and the center line of symmetry of the tooth portion 1121 passing through the projection of the central axis of the stator core 110 is defined as θ.

[0072] Referring to Figure 2 As shown, it can be understood that the simplified cross-sectional area of the wire slot 113 is defined as S1. In the projection plane perpendicular to the central axis of the rotor core 210, the simplified cross-sectional area of the wire slot 113 is the area of the region surrounded by the line connecting the projections of the two wall surfaces of the wire slot 113 facing each other along the circumferential direction of the stator core 110, the line connecting the two ends of the two projections close to the central axis of the stator core 110, and the line connecting the two ends of the two projections away from the central axis of the stator core 110, and generally, the region is isosceles trapezoidal. The simplified cross-sectional area S1 of the wire slot 113 reflects the amount of winding to some extent, that is, the number of turns of the winding.

[0073] ,

[0074] wherein, .

[0075] Referring to Figure 3As shown, it can be understood that the cross-sectional area of the permanent magnet 220 is defined as S2. The maximum length of the permanent magnet 220 along the radial direction of the rotor core 210 is a, that is, the maximum distance between the two wall surfaces of the permanent magnet 220 facing away along the radial direction of the rotor core 210, and the maximum thickness of the permanent magnet 220 along the circumferential direction of the rotor core 210 is b, that is, the maximum distance between the two wall surfaces of the permanent magnet 220 facing away along the circumferential direction of the rotor core 210. Generally, in the projection plane perpendicular to the central axis of the rotor core 210, the projection of the permanent magnet 220 is a rectangle, the length of the projection of the permanent magnet 220 is a, and the width of the projection of the permanent magnet 220 is b, then S2=a*b. The cross-sectional area S2 of the permanent magnet 220 to some extent reflects the amount of the permanent magnet 220, that is, the magnetic flux of the permanent magnet 220.

[0076] Referring to Figure 2 and Figure 3 As shown, it can be understood that the simplified cross-sectional area S1 of the wire slot 113 and the cross-sectional area S2 of the permanent magnet 220 satisfy: 2.6≤S2 / S1≤3.3.

[0077] When S2 / S1<2.6, the cross-sectional area S2 of the permanent magnet 220 is too small, the magnetic flux of the permanent magnet 220 is small, the simplified cross-sectional area S1 of the wire slot 113 is too large, the number of turns of the winding is large, the magnetic flux of the stator core 110 is prone to saturation, the utilization rate of the winding is reduced, which will cause the output torque of the motor to decrease, and the product of the number of turns of the winding and the magnetic flux of the permanent magnet 220 is small, the no-load back EMF is reduced, and the efficiency is reduced; when S2 / S1>3.3, the cross-sectional area S2 of the permanent magnet 220 is too large, the magnetic flux of the permanent magnet 220 is large, the magnetic flux of the rotor core 210 is prone to saturation, the utilization rate of the permanent magnet 220 is reduced, the simplified cross-sectional area S1 of the wire slot 113 is too small, the number of turns of the winding is small, which will also cause the output torque of the motor to decrease, and the product of the number of turns of the winding and the magnetic flux of the permanent magnet 220 is small, the no-load back EMF is reduced, and the efficiency is reduced.

[0078] Therefore, 2.6≤S2 / S1≤3.3, for example, the value of S2 / S1 is 2.6, 2.68, 2.71, 2.94, 3.2, 3.25 or 3.3, etc., to optimize and adjust the simplified cross-sectional area S1 of the wire slot 113 and the cross-sectional area S2 of the permanent magnet 220, so that the ratio of the cross-sectional area S2 of the permanent magnet 220 to the simplified cross-sectional area S1 of the wire slot 113 is within a suitable range, that is, the number of turns of the winding and the amount of the permanent magnet 220 are optimized, thereby improving the utilization rate of the winding and the permanent magnet, and improving the output torque, no-load back EMF and operating efficiency of the motor.

[0079] Referring to Figure 4As shown, it can be understood that the core unit 211 includes two outer magnetic bridges 2111 and two inner magnetic bridges 2112. The two outer magnetic bridges 2111 are located on both sides of the outer end of the core unit 211 along the circumference of the rotor core 210, and the two inner magnetic bridges 2112 are located on both sides of the inner end of the core unit 211 along the circumference of the rotor core 210. The outer magnetic bridges 2111 and the inner magnetic bridges 2112 respectively abut against the two ends of the permanent magnet 220 in the radial direction to achieve positioning of the permanent magnet 220.

[0080] Reference Figure 1 As shown, it is understandable that the disconnection between two adjacent core units 211 helps to reduce magnetic leakage and improve the utilization rate of the permanent magnet 220.

[0081] Reference Figure 1 As shown, it can be understood that in this embodiment, the rotor assembly 200 also includes an inner core 230, which is disposed within the space surrounded by multiple core units 211. Typically, the inner core 230 has a shaft hole in its center for the shaft to pass through, and the shaft is fixedly connected to the inner core 230. The inner core 230 is disconnected from the multiple core units 211, which helps to further reduce magnetic leakage and improve the utilization rate of the permanent magnets 220. It is readily understood that the spaces between the multiple core units 211, the multiple permanent magnets 220, the inner core 230, and the shaft are filled with injection-molded material to achieve interconnection and fixation, thereby improving the structural stability of the rotor assembly 200.

[0082] Reference Figure 4 As shown, it can be understood that the maximum distance between the two opposite ends of the two external magnetic bridges 2111 along the circumference of the rotor core 210 is defined as c, and the simplified cross-sectional area of ​​the core unit 211 is S3. Since the core unit 211 is roughly fan-shaped, the simplified cross-sectional area of ​​the core unit 211 can be understood as having c as the base. The area of ​​the triangle with height is, i.e. Figure 4 The area of ​​the dashed triangle. That is to say, The simplified cross-sectional area S3 of the core unit 211 reflects, to some extent, the amount of rotor core 210 used.

[0083] Reference Figure 3 and Figure 4 As shown, it can be understood that the cross-sectional area S2 of the permanent magnet 220 and the simplified cross-sectional area S3 of the core unit 211 satisfy: 0.75≤S2 / S3≤1.5.

[0084] When S2 / S3<0.75, the cross-sectional area S2 of the permanent magnet 220 is too small, the magnetic flux of the permanent magnet 220 is small, and the product of the number of turns of the winding and the magnetic flux of the permanent magnet 220 is small under the premise that the number of turns of the winding is unchanged, the no-load back EMF decreases, the output torque of the motor decreases, the simplified cross-sectional area S3 of the core unit 211 is too large, the cost increases, the loss increases, and the operating efficiency of the motor decreases; when S2 / S3>1.5, the cross-sectional area S2 of the permanent magnet 220 is too large, the cost increases, although the magnetic flux of the permanent magnet 220 is large, the simplified cross-sectional area S3 of the core unit 211 is too small, the magnetic flux of the core unit 211 is easy to saturate, which leads to a decrease in the utilization rate of the permanent magnet 220 and also leads to a decrease in the operating efficiency of the motor.

[0085] Therefore, 0.75≤S2 / S3≤1.5, for example, the value of S2 / S3 is 0.75, 0.79, 0.86, 1.1, 1.21, 1.34, 1.43, or 1.5, etc., to optimize and adjust the cross-sectional area S2 of the permanent magnet 220 and the simplified cross-sectional area S3 of the core unit 211, so that the ratio of the cross-sectional area S2 of the permanent magnet 220 and the simplified cross-sectional area S3 of the core unit 211 is within an appropriate range, i.e., the amount of the permanent magnet 220 and the amount of the core unit 211 are optimized, thereby increasing the no-load back EMF and the output torque of the motor, reducing the loss, and improving the operating efficiency.

[0086] Referring to Figure 6 It can be seen from the figure that when the value of S2 / S3 is constant, the efficiency of the motor first increases and then decreases with the increase of the value of S2 / S1, and when the value of S2 / S1 is constant, the efficiency of the motor also first increases and then decreases with the increase of the value of S2 / S3. Moreover, when the value of S2 / S1 is about 3 and the value of S2 / S3 is about 1.2, the efficiency of the motor is the largest, about 73.5%. When 2.6≤S2 / S1≤3.3 and 0.75≤S2 / S3≤1.5, the efficiency of the motor remains above about 68%. Therefore, when 2.6≤S2 / S1≤3.3 and 0.75≤S2 / S3≤1.5, the efficiency of the motor can be effectively improved.

[0087] Referring to Figure 2As shown, it can be understood that the minimum tooth width W of the tooth portion 1121 and the minimum thickness H of the stator yoke portion 111 satisfy: 1.5≤W / H≤2.2. When W / H<1.5, the minimum width W of the tooth portion 1121 is too small, the magnetic flux of the tooth portion 1121 is prone to saturation, which will cause the output torque of the motor to decrease, and the minimum thickness H of the stator yoke portion 111 is too large, the material is increased, and the cost is increased; when W / H>2.2, the minimum thickness H of the stator yoke portion 111 is too small, the magnetic flux of the stator yoke portion 111 is prone to saturation, which will cause the output torque of the motor to decrease, and the minimum tooth width of the tooth portion 1121 is too large, the material is increased, and the cost is increased.

[0088] Therefore, 1.5≤W / H≤2.2 is satisfied, for example, the value of W / H is 1.5, 1.63, 1.78, 1.82, 1.95, 2.1 or 2.2, etc. The minimum tooth width of the tooth portion 1121 and the minimum thickness of the stator yoke portion 111 are adjusted, so that the ratio of the minimum tooth width W of the tooth portion 1121 to the minimum thickness H of the stator yoke portion 111 is within a suitable range, thereby reducing the magnetic flux saturation degree of the stator core 110, improving the output torque of the motor, and reducing the material cost.

[0089] Referring to Figure 7 As shown, it can be understood that the figure shows a comparison diagram of the output torque of the motor of the embodiment and the output torque of the motor of the prior art with the change of the input current. From the two curves in the figure, it can be known that in the light load state, that is, when the input current is small, specifically, when the input current is in the range of 0A-0.6A, the two curves are basically coincident; in the heavy load state, that is, when the input current is large, specifically, when the input current is in the range of 0.6A-1.6A, the curve of the embodiment is located above the curve of the prior art. That is to say, in the light load state, the output torque of the motor of the embodiment is basically equal to the output torque of the motor of the prior art, while in the heavy load state, the output torque of the motor of the embodiment is greater than the output torque of the motor of the prior art. The motor of the embodiment has good heavy load capacity, and improves the overload capacity to a certain extent.

[0090] The fan of the second aspect embodiment of the utility model, including the fan wheel and the motor of the first aspect embodiment of the utility model, the fan wheel is installed on the rotating shaft.

[0091] The fan adopts all the technical solutions of the motor of the above-mentioned embodiments, and therefore at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments.

[0092] The electrical equipment of the third aspect embodiment of the utility model, including the fan of the second aspect embodiment of the utility model, the electrical equipment can be an air conditioner, a fresh air machine and the like.

[0093] The electric appliance has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments.

[0094] The utility model embodiment has been described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by ordinary skilled in the art without departing from the purpose of the utility model.

Claims

1. An electric machine characterized in that, The electric machine comprises: a stator assembly comprising a stator core and a plurality of windings, the stator core being annular and provided with an inner hole, the stator core comprising a stator yoke and a plurality of stator teeth, the plurality of stator teeth being connected to an inner circumferential wall of the stator yoke and arranged along a circumferential direction of the stator core, the plurality of windings being respectively wound around the plurality of stator teeth; a rotor assembly rotatably arranged in the inner hole, the rotor assembly comprising a rotor core and a plurality of permanent magnets, the rotor core being provided with a plurality of mounting slots arranged along the circumferential direction, the plurality of permanent magnets being correspondingly arranged in the plurality of mounting slots; wherein a minimum outer diameter of the stator core is D1, a minimum inner diameter of the stator core is D2, a maximum outer diameter of the rotor core is D3, a minimum inner diameter of the rotor core is D4, and a coefficient K satisfies: 。 2. The electric machine of claim 1, wherein: the minimum inner diameter D2 of the stator core satisfies 58mm≤D2≤62mm.

3. The electric machine of claim 1, wherein: a number of the stator teeth is N, the stator teeth comprise a tooth portion and a tooth shoe, the tooth portion is connected to the inner circumferential wall of the stator yoke and extends towards a center of the stator core, the tooth shoe is connected to an end of the tooth portion away from the stator yoke and protrudes along the circumferential direction towards both sides of the tooth portion, a minimum tooth width of the tooth portion is W along a radial direction of the stator core, a length of the tooth portion is L, a minimum thickness of the stator yoke is H along the circumferential direction, a winding slot is defined between two adjacent stator teeth, a simplified cross-sectional area of the winding slot is S1, and a cross-sectional area of the permanent magnet is S2, and the following condition is satisfied: 2.6≤S2 / S1≤3.

3. wherein , .

4. The electric machine of claim 1 or 3, characterized in that: The rotor core comprises a plurality of core units arranged at intervals along the circumferential direction, the maximum distance between two sides of the core units facing away from each other along the circumferential direction is c, the mounting slot is defined between two adjacent core units, the simplified cross-sectional area of the core unit is S3, and the cross-sectional area of the permanent magnet is S2, and the following is satisfied: 0.75≤S2 / S3≤1.5, wherein, .

5. The electric machine of claim 1, wherein: the stator teeth comprise a tooth portion and a tooth shoe, the tooth portion is connected to the inner circumferential wall of the stator yoke and extends towards a center of the stator core, the tooth shoe is connected to an end of the tooth portion away from the stator yoke and protrudes along the circumferential direction towards both sides of the tooth portion, a minimum tooth width of the tooth portion is W along a radial direction of the stator core, a minimum thickness of the stator yoke is H, and the following condition is satisfied: 1.5≤W / H≤2.

2.

6. The electric machine of claim 1, wherein: the stator yoke comprises a plurality of yoke units arranged along the circumferential direction, a joint structure is arranged between at least two adjacent yoke units, a bending portion is arranged between each of the remaining adjacent yoke units, and the plurality of stator teeth are respectively connected to the plurality of yoke units.

7. The electric machine of claim 1 or 6, characterized by: the rotor core comprises a plurality of core units arranged along the circumferential direction, and two adjacent core units are disconnected from each other.

8. The electric machine of claim 7, wherein: the rotor assembly further comprises an inner core arranged in a space surrounded by the plurality of core units, and the inner core is disconnected from the plurality of core units.

9. A fan characterised by The wind turbine comprises a wind wheel and the electric machine according to any one of claims 1 to 8, the rotor assembly further comprises a rotating shaft fixedly connected to the rotor core, and the wind wheel is arranged on the rotating shaft.

10. An electrical appliance apparatus, characterized by, The fan comprises the electric machine according to claim 9.

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