Motor, fan and electric appliance

Abstract

The invention discloses a motor, a fan and an electric appliance, and relates to the technical field of motors. The motor comprises a rotor assembly and a stator assembly. The rotor assembly comprises a plurality of rotor magnetic poles, the stator assembly comprises a stator iron core, the stator iron core comprises an iron core body, the iron core body is provided with a stator inner hole and a plurality of stator grooves arranged around the stator inner hole, the stator grooves are communicated with the stator inner hole through a first opening, and the rotor assembly is arranged in the stator inner hole; wherein the width of the first opening is W, the diameter of the inner hole of the stator is Di, and W and Di meet the following condition: 0.8 lt; ((W * LCM (Q1, Q2)) / (pi * Di)) lt; 1.2; q1 is the number of the stator slots; q2 is the number of rotor magnetic poles in the rotor assembly; pi is the circumference ratio; lCM (Q1, Q2) is the least common multiple of Q1 and Q2. Within the limited width range of the first opening, the no-load back electromotive force can be improved by fully utilizing the magnetic field modulation effect of the cogging, and meanwhile, the cogging torque is reduced by adjusting the air gap magnetic conductance, namely, the motor efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor, a fan and an electrical appliance. Background Art

[0002] With the improvement of energy efficiency indicators of household appliances, the efficiency requirements for fans are getting higher and higher, and the efficiency of fan motors directly affects the efficiency of fans. In existing motors used in fans, due to the stator slot structure set on the stator core, cogging torque is generated, which in turn causes the motor to generate additional torque pulsation, which increases the loss of the motor and reduces the efficiency of the motor. Summary of the invention

[0003] The main purpose of the present invention is to provide a motor, a fan and an electrical appliance, aiming to improve the working efficiency of the motor.

[0004] To achieve the above object, the motor provided by the present invention comprises:

[0005] a rotor assembly comprising a plurality of rotor poles; and

[0006] A stator assembly, the stator assembly comprising a stator core, the stator core comprising a core body, the core body having a stator inner hole and a plurality of stator slots arranged around the stator inner hole, the stator slots being connected to the stator inner hole through a first opening, and the rotor assembly being arranged in the stator inner hole;

[0007] Among them, the width of the first opening is W, the diameter of the stator inner hole is Di, W and Di satisfy: 0.8<((W*LCM(Q1,Q2)) / (pi*Di))<1.2; Q1 is the number of the stator slots; Q2 is the number of rotor poles in the rotor assembly; pi is the pi; LCM(Q1,Q2) is the least common multiple of Q1 and Q2.

[0008] In one embodiment, a ratio of the width of the first opening to the diameter of the stator inner hole is not less than 0.04 and not more than 0.08.

[0009] In one embodiment, a width of the first opening is not less than 2.5 mm and not more than 3.8 mm.

[0010] In one embodiment, a ratio of a width of the first opening to an outer diameter of the core body is not less than 0.03 and not greater than 0.04.

[0011] In one embodiment, the ratio of the diameter of the stator inner hole to the outer diameter of the core body is not less than 0.57 and not greater than 0.67.

[0012] In one embodiment, the core body further comprises:

[0013] a stator yoke, wherein the stator yoke is arranged in a ring shape; and

[0014] The stator teeth are multiple in number and are arranged at intervals along the circumferential direction of the stator yoke to form a plurality of stator slots.

[0015] In one embodiment, the number of the stator slots is 12, and the number of the magnetic poles of the rotor assembly is 10.

[0016] In one embodiment, the rotor assembly further comprises:

[0017] A rotor core, wherein a plurality of rotor magnetic poles are arranged on the rotor core along the circumference of the rotor core, and the rotor core is divided into a plurality of core units; each of the core units has a center line passing through the center of the rotor core;

[0018] Among them, the outer contour line of at least one of the core units is divided into a first arc segment and a second arc segment by its midline, and the minimum distance from the second arc segment to the center of the rotor core is smaller than the minimum distance from the first arc segment to the center of the rotor core.

[0019] The present invention provides a fan, comprising the motor described in any one of the aforementioned embodiments.

[0020] The present invention provides an electrical appliance, comprising the motor or fan described in any one of the aforementioned embodiments.

[0021] The technical solution of the present invention limits the width of the first opening in the stator core that connects the stator slot and the stator inner hole, so that within the limited range, the magnetic permeability of the air gap between the rotor assembly and the stator assembly changes differently, thereby modulating the air gap magnetic field to generate a new harmonic magnetic field. The new harmonic magnetic field can generate a fundamental wave back electromotive force in the winding, thereby increasing the no-load back electromotive force of the winding and improving the efficiency of the motor, thereby effectively reducing the motor excitation current and avoiding the problem of a sharp increase in the copper and iron loss of the motor due to the increase in the air gap, making the magnetic circuit of the stator assembly and the rotor assembly teeth smooth, improving the iron loss and copper loss distribution of the motor, improving the overall efficiency of the motor, and ensuring the motor performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1It is a schematic structural diagram of a stator core in an embodiment of a motor of the present invention;

[0024] Figure 2 It is a structural schematic diagram of an embodiment of a motor of the present invention;

[0025] Figure 3 It is a structural schematic diagram of another embodiment of the motor of the present invention;

[0026] Figure 4 The relationship diagram between the magnetic flux density and the spatial position when the width of the first opening of the present invention is 0.8 mm and 3.1 mm respectively;

[0027] Figure 5 The graph is a relationship between the harmonic flux density and the harmonic order when the width of the first opening of the present invention is 0.8 mm and 3.1 mm respectively;

[0028] Figure 6 The diagram is a relationship diagram between the back electromotive force and the rotor position when the width of the first opening of the present invention is 0.8 mm and 3.1 mm respectively;

[0029] Figure 7 This is a graph showing the relationship between the electromagnetic torque and the rotor position when the width of the first opening of the present invention is 0.8 mm and 3.1 mm respectively.

[0030] Description of Figure Numbers:

[0031] Label name Label name 10 Stator components 20 Rotor assembly 100 Stator core 21 Rotor core 101 Stator slot 21a The first arc segment 102 First opening 21b The second arc segment 120 Stator teeth 22 Rotor pole 110 stator yoke 30 Air Gap 1 Motor

[0032] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] The present invention provides a motor.

[0037] In the embodiment of the present invention, Figures 1 to 7 As shown, the motor 1 includes a rotor assembly 20 and a stator assembly 10; the rotor assembly 20 includes a plurality of rotor poles 22, the stator assembly 10 includes a stator core 100, the stator core 100 includes a core body, the core body has a stator inner hole and a plurality of stator slots 101 arranged around the stator inner hole, the stator slots 101 are connected to the stator inner hole through a first opening 102, and the rotor assembly 20 is arranged in the stator inner hole; wherein the width of the first opening 102 is W, the diameter of the stator inner hole is Di, W and Di satisfy: 0.8<((W*LCM(Q1,Q2)) / (pi*Di))<1.2; Q1 is the number of the stator slots 101; Q2 is the number of the rotor poles 22 in the rotor assembly 20; pi is the pi; LCM(Q1,Q2) is the least common multiple of Q1 and Q2.

[0038] For example, in order to facilitate understanding of the technical solution of this embodiment, the following is an example in which the diameter Di of the stator inner hole is 60 mm, the number Q1 of the stator slots 101 is 12, and the number Q2 of the magnetic poles of the rotor assembly 20 is 10. The lowest common multiple of Q1 and Q2 is 60. At this time, (W / pi) is not less than 0.8 and not greater than 1.2, and the value range of W is: 2.5 mm to 3.8 mm. Of course, in other embodiments, the value range of W varies according to the change in the diameter of the stator inner hole.

[0039] It is understandable that the stator core 100 is an important component of the stator assembly 10 in the motor 1. The stator assembly 10 usually needs to be used in conjunction with the rotor assembly 20. The stator assembly 10 can be sold together with the rotor assembly 20 to form the motor 1, or it can be produced and sold separately. The stator assembly 10 usually includes a stator core 100 and a stator winding, and the stator winding is wound on the stator core 100. Of course, the stator core 100 can also be produced and sold separately. Please refer to Figure 1 The stator core 100 has a core body, wherein the core body has a stator inner hole and a plurality of stator slots 101 arranged around the stator inner hole, and the stator slots 101 are connected to the stator inner hole through a first opening 102 .

[0040] Exemplarily, the core body includes a stator yoke 110 and a stator tooth 120, wherein the stator yoke 110 is arranged in an annular shape; the number of the stator tooth 120 is multiple, and the stator tooth 120 is arranged at intervals along the circumference of the stator yoke 110 to form a plurality of stator slots 101. The stator yoke 110 and the plurality of stator teeth 120 can be integrally formed, and the plurality of stator teeth 120 are arranged at intervals along the circumference on the inner side of the annular stator yoke 110 to form a stator inner hole, and the stator inner hole is used for the rotor assembly 20 to pass through. Please continue to read Figure 1 and Figure 2 The plurality of stator teeth 120 are arranged in a circular array with the axis of the central hole as the center, and the plurality of stator teeth 120 can be arranged at equal intervals around the central hole, and a stator slot 101 is formed between two adjacent stator teeth 120. The stator core 100 can be integrally arranged, and the process of integrally arranged is simple, which reduces the difficulty of manufacturing the stator core 100, thereby reducing the production cost of the motor 1.

[0041] In addition, since the stator core 100 is arranged as an integral whole, the mechanical properties of the stator core 100 can be effectively improved, and the stability of the motor 1 during operation and the service life of the motor 1 can be improved. The stator core 100 can also include a plurality of stator punchings, which are stacked and punched, wherein the stator punchings can be silicon steel sheets, which can reduce eddy current loss and hysteresis loss, thereby reducing the heating of the core, and the plurality of silicon steel sheets are insulated from each other, which can reduce the flow area and further reduce the heating of the stator. The stator punchings include a stator yoke 110 monomer, a plurality of stator tooth monomers and a center hole monomer, and the plurality of stator yoke 110 monomers on each stator punching are stacked along the axial direction of the stator core 100, so that the plurality of stator yoke 110 monomers form the above-mentioned stator yoke 110. The multiple stator tooth monomers on each stator punching sheet are stacked along the axial direction of the stator core 100, so that the multiple stator tooth monomers form the above-mentioned stator teeth; the center hole monomer of each stator punching sheet passes through the axial direction of the stator core 100, so that the multiple center hole monomers form a stator inner hole for the rotor to pass through.

[0042] See also Figures 4 to 7 In this embodiment, the stator slot 101 is connected to the stator inner hole through the first opening 102. By adjusting the width of the first opening 102, the magnetic permeability of the air gap 30 between the rotor assembly 20 and the stator assembly 10 can be changed differently, thereby modulating the air gap magnetic field to generate a new harmonic magnetic field. The new harmonic magnetic field can generate a fundamental wave back electromotive force in the winding, thereby increasing the no-load back electromotive force of the winding and improving the efficiency of the motor 1.

[0043] In this embodiment, if the width of the first opening 102 is too large, the equivalent air gap of the motor 1 will increase, the operating current will be too large, and the copper loss and iron loss of the stator will increase. Therefore, the width of the first opening 102 cannot be too large. Figure 1 , W is the width of the stator slot 101 opening, Di is the inner diameter of the stator, and in this embodiment, the ratio of the width of the first opening 102 to the diameter of the stator inner hole is not less than 0.04 and not greater than 0.08. In this way, this embodiment limits the air gap 30 of the motor 1 by limiting the ratio of the width of the first opening 102 to the diameter of the stator inner hole, thereby realizing the use of the magnetic field modulation effect of the stator slot 101 to improve the no-load back EMF, and at the same time, by adjusting the air gap permeability to reduce the cogging torque, improve the iron loss and copper loss distribution of the stator, and improve the efficiency of the motor 1.

[0044] It is understood that the ratio of the width of the first opening 102 to the diameter of the stator inner hole is not less than 0.04 and not more than 0.08, and the ratio of the width of the first opening 102 to the diameter of the stator inner hole includes but is not limited to 0.04, 0.05, 0.06, 0.07 or 0.08. In an exemplary embodiment, the diameter of the stator inner hole is 60 mm, and the value of the first opening 102 is 2.4 mm, 3.0 mm, 3.6 mm, 4.2 mm or 4.8 mm. The diameter of the stator inner hole and the width of the first opening 102 can be directly measured by a measuring tool such as a vernier caliper.

[0045] For example, see Figures 4 to 7 In the conventional permanent magnet motor 1, the slot opening is 0.8 mm, and in the permanent magnet motor 1 provided in the present practical information, the slot opening is 3.1 mm. Figures 3 to 7 The no-load air gap magnetic flux waveform, no-load air gap magnetic flux harmonic analysis, no-load back EMF waveform and load torque waveform are shown in turn under the width of the first opening 102 of the stator slot 101 of the two. It can be seen that after the slot opening increases from 0.8mm to 3.1mm, the 7-pole magnetic field harmonics and 17-pole magnetic field harmonics of the no-load air gap magnetic flux increase significantly, the no-load back EMF increases by 3%, and the torque increases by 2.3%.

[0046] The technical solution of the present invention limits the width of the first opening 102 connecting the stator slot 101 and the stator inner hole in the stator core 100, so that within the limited range, the magnetic permeability of the air gap 30 between the rotor assembly 20 and the stator assembly 10 changes differently, thereby modulating the air gap magnetic field to generate a new harmonic magnetic field. The new harmonic magnetic field can generate a fundamental wave back electromotive force in the winding, thereby increasing the no-load back electromotive force of the winding and improving the efficiency of the motor 1, thereby effectively reducing the excitation current of the motor 1 and avoiding the problem of a sharp increase in copper and iron loss due to the increase in the air gap 30 of the motor 1, making the magnetic circuit of the teeth of the stator assembly 10 and the rotor assembly 20 smooth, improving the iron loss and copper loss distribution of the motor 1, improving the overall efficiency of the motor 1, and ensuring the performance of the motor 1.

[0047] In a preferred embodiment, the width of the first opening 102 is not less than 2.5 mm and not more than 3.8 mm. Specifically, the width of the first opening 102 includes but is not limited to 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3.0 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm or 3.8 mm.

[0048] In another embodiment, the ratio of the width of the first opening 102 to the outer diameter of the core body is not less than 0.03 and not greater than 0.04. Figure 1 The outer diameter of the core body is Do. Taking the outer diameter Do of the core body equal to 100 mm as an example, the width of the first opening 102 is between 3 mm and 4 mm.

[0049] In yet another embodiment, the width of the stator yoke 110 cannot be too small. Therefore, in this embodiment, the ratio of the diameter of the stator inner hole to the outer diameter of the core body is not less than 0.57 and not greater than 0.67.

[0050] For example, see Figure 1 , the outer diameter of the core body is Do. Taking the outer diameter Do of the core body equal to 100 mm as an example, the diameter of the stator inner hole ranges from 57 mm to 67 mm. Specifically, the diameter of the stator inner hole includes but is not limited to 57 mm, 58 mm, 59 mm, 60 mm, 61 mm, 62 mm, 63 mm, 64 mm, 65 mm, 66 mm or 67 mm.

[0051] In a preferred embodiment, see Figure 3In order to reduce the rotor magnetic field harmonics and improve the deterioration of the cogging torque caused by the increase of the slot opening, the rotor assembly 20 also includes a rotor core 21, and a plurality of rotor poles 22 are arranged on the rotor core 21 along the circumference of the rotor core 21, and the rotor core 21 is separated into a plurality of core units; each of the core units has a center line passing through the center of the rotor core 21; the outer contour line of at least one of the core units is divided into a first arc segment 21a and a second arc segment 21b by the center line, and the minimum distance from the second arc segment 21b to the center of the rotor core 21 is less than the minimum distance from the first arc segment 21a to the center of the rotor core 21.

[0052] The present invention also proposes a fan, which includes the motor 1 described in any of the aforementioned embodiments. The specific structure of the motor 1 refers to the above embodiments. Since the fan of the present invention adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0053] The present invention further provides an electrical appliance, which includes the motor 1 or fan described in any of the above embodiments. The specific structure of the motor 1 refers to the above embodiments. Since the electrical appliance of the present invention adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Specifically, the electrical appliance can be a compressor, etc., which is not limited here.

[0054] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A motor, characterized in that: include: a rotor assembly, the rotor assembly comprising a plurality of rotor poles; as well as A stator assembly, the stator assembly comprising a stator core, the stator core comprising a core body, the core body having a stator inner hole and a plurality of stator slots arranged around the stator inner hole, the stator slots being connected to the stator inner hole through a first opening, and the rotor assembly being arranged in the stator inner hole; Among them, the width of the first opening is W, the diameter of the stator inner hole is Di, W and Di satisfy: 0.8<((W*LCM(Q1,Q2)) / (pi*Di))<1.2; Q1 is the number of the stator slots; Q2 is the number of rotor poles in the rotor assembly; pi is the pi; LCM(Q1,Q2) is the least common multiple of Q1 and Q2.

2. The motor according to claim 1, characterized in that The ratio of the width of the first opening to the diameter of the stator inner hole is not less than 0.04 and not more than 0.

08.

3. The motor according to claim 1, characterized in that The width of the first opening is not less than 2.5 mm and not more than 3.8 mm.

4. The motor according to claim 1, characterized in that The ratio of the width of the first opening to the outer diameter of the core body is not less than 0.03 and not more than 0.

04.

5. The motor according to claim 1, characterized in that The ratio of the diameter of the inner hole of the stator to the outer diameter of the core body is not less than 0.57 and not greater than 0.

67.

6. The motor according to any one of claims 1 to 5, characterized in that: The core body also includes: a stator yoke, wherein the stator yoke is arranged in a ring shape; and The stator teeth are multiple in number and are arranged at intervals along the circumferential direction of the stator yoke to form a plurality of stator slots.

7. The motor according to claim 1, characterized in that The number of the stator slots is 12, and the number of the magnetic poles of the rotor assembly is 10.

8. The motor according to claim 1, characterized in that The rotor assembly further comprises: A rotor core, wherein a plurality of rotor magnetic poles are arranged on the rotor core along the circumference of the rotor core, and the rotor core is divided into a plurality of core units; each of the core units has a center line passing through the center of the rotor core; Among them, the outer contour line of at least one of the core units is divided into a first arc segment and a second arc segment by its midline, and the minimum distance from the second arc segment to the center of the rotor core is smaller than the minimum distance from the first arc segment to the center of the rotor core.

9. A fan, characterized in that: Comprising a motor as claimed in any one of claims 1 to 8.

10. An electrical appliance, characterized in that: It comprises the motor according to any one of claims 1 to 8 or the fan according to claim 9.

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