Motor assembly and motor

Abstract

The utility model relates to a motor assembly and a motor having the same. The motor assembly comprises a stator punching sheet, the stator punching sheet comprises a stator yoke part and a plurality of stator tooth parts extending from the stator yoke part, and a stator slot is limited between every two adjacent stator tooth parts; the motor comprises a stator punching sheet and a rotor punching sheet, the rotor punching sheet is surrounded by the stator punching sheet and is separated from the stator punching sheet through an air gap, the rotor punching sheet comprises a rotor yoke part and a plurality of rotor tooth parts extending from the rotor yoke part, and a rotor slot is limited between every two adjacent rotor tooth parts. Wherein the number of the stator slots is 24, the number of the rotor slots is 42, and the ratio of the inner diameter (D1) of the stator punching sheet to the outer diameter (D2) of the stator punching sheet is in the range of 0.495-0.535.

Description

Technical Field

[0001] The present disclosure relates to a motor assembly and a motor having the motor assembly. Background Art

[0002] Faced with the severe challenges of global climate change and environmental issues, achieving carbon neutrality has become a shared goal of the international community. To improve energy efficiency, governments worldwide have introduced a series of policies and standards to promote energy conservation and emission reduction in both industrial and civilian sectors. Against this backdrop, the international market's requirements for motor energy efficiency are constantly increasing to meet increasingly stringent environmental regulations and market demands.

[0003] To meet these new energy efficiency standards, motor manufacturers need to upgrade the energy efficiency of existing products. This may involve optimizing motor design, applying new materials, improving manufacturing processes, and adopting more precise control algorithms. It also often requires considering multiple factors simultaneously, including cost, performance, reliability, and service life.

[0004] However, there is currently no simple and effective energy efficiency upgrade solution on the market. Utility Model Content

[0005] In response to the above-mentioned problems and needs, the present disclosure proposes a motor assembly and a motor having the motor assembly, which solves the above-mentioned problems and brings other technical effects by adopting the following technical features.

[0006] On the one hand, the present disclosure provides a motor assembly, comprising: a stator punching, wherein the stator punching includes a stator yoke and a plurality of stator teeth extending from the stator yoke, wherein a stator slot is defined between each two adjacent stator teeth; a rotor punching, which is surrounded by the stator punching and separated from the stator punching by an air gap, wherein the rotor punching includes a rotor yoke and a plurality of rotor teeth extending from the rotor yoke, wherein a rotor slot is defined between each two adjacent rotor teeth; wherein the number of the stator slots and the rotor slots are 24 and 42 respectively, and the ratio of the inner diameter to the outer diameter of the stator punching is in the range of 0.495-0.535.

[0007] According to a preferred embodiment, the outer diameter of the stator punching sheet is in the range of 138 mm to 141 mm.

[0008] According to a preferred embodiment, the stator sheet has a plurality of ventilation holes spaced apart from each other in the circumferential direction, each ventilation hole extends circumferentially, and a ratio of a circumferential length to a radial width of the ventilation hole is in a range of 6.5:1 to 7.5:1.

[0009] According to a preferred embodiment, the motor assembly further comprises two end rings and a plurality of guide bar portions located between the two end rings, each guide bar portion being located in one of the rotor slots. The ratio of the sum of the slot areas of the plurality of rotor slots to the sum of the cross-sectional areas of the two end rings is in a range of 1:0.75 to 1:1.25.

[0010] According to a preferred solution, both ends of the bottom of the stator slot have rounded corner structures, and the radius of the rounded corner structures is in the range of 2 mm to 4 mm.

[0011] According to a preferred embodiment, the ratio of the magnetic flux density of the stator yoke to the magnetic flux density of the stator teeth is in the range of 1:1.02 to 1:1.07.

[0012] According to a preferred embodiment, the ratio of the magnetic flux density of the stator teeth to the magnetic flux density of the rotor teeth is in the range of 1:1.02 to 1:1.07.

[0013] According to a preferred solution, the magnetic flux density of the stator teeth and the rotor teeth is no higher than 1.7 Tesla.

[0014] The present disclosure also provides a motor, which includes the motor assembly as described in any one of the above items.

[0015] Hereinafter, the best embodiment for implementing the present disclosure will be described in more detail with reference to the accompanying drawings so that the features and advantages of the present disclosure can be easily understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings of the embodiments of the present disclosure. The drawings are only used to illustrate some embodiments of the present disclosure, and are not intended to limit all embodiments of the present disclosure to these drawings.

[0017] Figure 1 A motor assembly according to a preferred embodiment of the present disclosure is shown;

[0018] Figure 2 Shows a ventilation hole of a motor assembly according to a preferred embodiment of the present disclosure;

[0019] Figure 3 shows the stator slots of the motor assembly according to the preferred embodiment of the present disclosure;

[0020] Figure 4 Two end ring portions of a motor assembly according to a preferred embodiment of the present disclosure and a plurality of guide bar portions extending between the two end ring portions are shown;

[0021] Figure 5 Two end ring portions and a plurality of guide bar portions extending between the two end ring portions are shown in partial cross-section;

[0022] Figure 6 A starting torque radar diagram is shown when the aforementioned D1 / D2 range is satisfied under an exemplary 24 / 42 stator / rotor slot matching condition;

[0023] Figure 7 NT curves are shown.

[0024] Reference Signs List

[0025] 1 stator punching

[0026] 11 Stator yoke part

[0027] 12 stator teeth

[0028] 13 stator slots

[0029] 14 Ventilation holes

[0030] 2 rotor punching

[0031] 21 Rotor yoke

[0032] 22 rotor teeth

[0033] 23 rotor slots

[0034] 24 End ring part

[0035] 25 guide bar part

[0036] 26 rounded corner structure DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the technical solution of the present disclosure clearer, the technical solution of the embodiment of the present disclosure will be clearly and completely described below in conjunction with the drawings of the specific embodiments of the present disclosure. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0038] Compared to the embodiments shown in the drawings, feasible embodiments within the scope of protection of the present disclosure may have fewer components, additional components not shown in the drawings, different components, differently arranged components, or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0039] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the present disclosure belongs. The words "first", "second" and similar terms used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not necessarily indicate a quantity limitation. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0040] As described in the background technology section, in the context of carbon neutrality, it is necessary to upgrade the energy efficiency of motors. However, there is currently no simple and effective energy efficiency upgrade solution. To address this, the present disclosure, starting from the structural design of motor punchings, establishes a reasonable ratio of the number of stator slots 13 and rotor slots 23, designs a matching ratio of the inner and outer diameters of the stator punchings 1, improves the reasonable distribution of the motor magnetic field / stator and rotor magnetic fields and ventilation holes 14, and designs other specific features detailed below, thereby achieving improved motor energy efficiency.

[0041] The motors disclosed herein, particularly ODP motors, refer to open drip proof motors. These motors are designed to force air through the open end of the motor and out the sides. They are typically fully shielded or splash proof. The ventilation holes 14 in ODP motors allow air to flow directly through the windings, resulting in lower operating temperatures and higher efficiency. The motors disclosed herein may also be other types of motors with built-in air ducts, such as single-phase asynchronous motors with a single winding and built-in air ducts.

[0042] like Figure 1 As shown, the motor assembly of the present disclosure generally includes a stator punching 1 and a rotor punching 2 surrounded by the stator punching 1 .

[0043] The stator lamination 1 generally has an annular structure and includes a substantially annular stator yoke 11 and a plurality of stator teeth 12 extending from the stator yoke 11. The stator teeth 12 extend radially inward from the inner circumference of the stator yoke 11. A stator slot 13 is defined between each two adjacent stator teeth 12.

[0044] The rotor sheet 2 is located within the central hole of the stator sheet 1 and is separated from the stator sheet 1 by an air gap. The rotor sheet 2 includes a generally annular rotor yoke 21 and a plurality of rotor teeth 22 extending from the rotor yoke 21. The rotor teeth 22 extend radially outward from the outer circumference of the rotor yoke 21. A rotor slot 23 is defined between each two adjacent rotor teeth 22.

[0045] According to the preferred embodiment proposed in the present disclosure, the ratio of the inner diameter to the outer diameter of the stator punching sheet 1 is in the range of 0.495 to 0.535. Figure 1 D1 and D2 represent the inner diameter and outer diameter of the stator punching sheet 1 respectively.

[0046] As used herein, the expression "within the range" is intended to include both endpoints and all values between the endpoints. The ratio of the inner diameter to the outer diameter of the stator sheet 1 can be any value greater than 0.495 and less than 0.535, and can be 0.495 or 0.535 itself. For example, the ratio of the inner diameter to the outer diameter of the stator sheet 1 can be 0.495, 0.496, 0.5, 0.51, 0.515, 0.52, 0.53, 0.535, etc.

[0047] By making the ratio of the inner diameter to the outer diameter of the stator punching sheet 1 within the range of 0.495 to 0.535, it is avoided that the magnetic flux density is too high and the performance is reduced, and it is also avoided that the magnetic flux density is too low and the silicon steel punching sheet is not effectively utilized.

[0048] According to a preferred embodiment, the outer diameter of the stator sheet 1 is in the range of 138 mm to 141 mm, for example, 138 mm, 139 mm, 140 mm, 141 mm, etc.

[0049] The present disclosure also proposes to design the number of stator slots 13 of the stator punching sheet 1 and the number of rotor slots 23 of the rotor punching sheet 2 to be 24 and 42 respectively. Among them, in traditional cognition, it is believed that in the stator and rotor slot matching of a 2-pole motor, when the number of stator slots 13 is 24, the number of rotor slots 23 that can be safely used is only 18 and 30. After research, the inventors of this solution found that the number of rotor slots 23 in these two slot matchings is relatively small, resulting in a single slot area that is too large. The excessive slot area is prone to shrinkage during die-casting of aluminum, which is not conducive to mass production. Therefore, it is not suitable. For this reason, after a large number of tests, the stator and rotor slot matching number of 24 / 42 was finally confirmed. After experimental verification, the stator and rotor slot matching number of 24 / 42 has no electromagnetic sound, no dead spots in the radar map, no concave points in the torque-speed curve (i.e., TN curve) of the motor, and has good electrical performance. In particular, through extensive data verification and testing, by designing the ratio of the inner diameter D1 to the outer diameter D2 of the stator sheet 1 to be within the range of 0.495 to 0.535, and by making the number of the stator slots 13 and the number of the rotor slots 23 24 and 42, respectively, the efficiency of the motor can be significantly improved while maintaining the same output power. Figure 6 The starting torque radar diagram is shown when the aforementioned D1 / D2 range is satisfied under the exemplary 24 / 42 stator-rotor slot matching condition. Figure 7 NT curves are shown.

[0050] In a preferred embodiment, the stator sheet 1 has a plurality of ventilation holes 14. Figure 1 As shown, the plurality of ventilation holes 14 are spaced apart from each other in the circumferential direction, and each ventilation hole 14 may extend circumferentially. Here, "each ventilation hole 14 extends circumferentially" means that each ventilation hole 14 is generally arranged along the circumference, including but not limited to the case where the centerline of the ventilation hole 14 extends circumferentially.

[0051] The present disclosure proposes that the ratio of the circumferential length L to the radial width D of each ventilation hole 14 is in the range of 6.5:1 to 7.5:1. Preferably, the ratio of the circumferential length L to the radial width D of each ventilation hole 14 is 7:1. Figure 2The circumferential length L and the radial width D are shown in the figure. The circumferential length L of the ventilation hole 14 is the distance between the two boundary points of the ventilation hole 14 that are farthest apart in the circumferential direction. The radial width D is the distance between the two radial edges of the ventilation hole 14. In the preferred embodiment, the two radial edges of the ventilation hole 14, i.e., the radial outer edge and the radial inner edge, extend in the circumferential direction, so there is a uniform radial width between the radial outer edge and the radial inner edge. However, the present disclosure does not exclude the situation where one or more of the radial outer edge and the radial inner edge do not extend in the circumferential direction. In this case, the radial width D is defined as the average distance between the radial outer edge and the radial inner edge, or the distance between the radial outer edge and the radial inner edge at the middle position of the ventilation hole 14.

[0052] By providing an elongated ventilation hole 14 in the stator yoke 11 of the stator punching sheet 1, the efficiency can be improved while effectively improving the heat exchange. Through simulation experiments, it is found that the ventilation hole 14 that satisfies the ratio of the circumferential length L to the radial width D of 6.5:1 to 7.5:1 has less obstruction to the magnetic field, so that the loss of the magnetic field when passing through the punching sheet yoke is reduced. Moreover, the heat exchange area of such ventilation hole 14 (which can be roughly calculated by multiplying the circumference of the ventilation hole (14) by the height) is larger than that of the conventional thick and long ventilation hole 14, and the utilization rate of the stator yoke is increased, which effectively reduces the iron loss of the stator, that is, while improving the efficiency, the heat dissipation efficiency is also increased.

[0053] In conventional stator laminations 1, stator slots 13 are flat-bottomed, meaning their bottom ends are sharp corners or very small arcs. The inventors of the present disclosure have discovered that, while this approach is considered to improve material utilization, conventional flat-bottomed slots have drawbacks during actual production: due to the folded ends of the slot insulation used to fit within stator slots 13 and the inherent elasticity of the material, the slot insulation, after being bent and formed, does not form sharp corners consistent with the slot shape. This results in a portion of the space between the slot insulation arc and the sharp corner of the flat-bottomed slot being wasted, preventing the passage of magnetic fields and the insertion of windings.

[0054] Therefore, when designing the present punching sheet, a large number of experiments were conducted, combining slot insulation of different materials and thicknesses. Finally, the present disclosure found that rounded corner structures 26 are provided at both ends of the stator slot 13, and the radius of the rounded corner structure 26 is designed to be R=2-4mm, which is the best. Figure 3 The rounded corners 26 at both ends of the bottom of the stator slots 13 are shown. Due to the presence of the rounded corners 26, the space previously hollowed out at the sharp corners is used for magnetic conduction, only slightly reducing the magnetic flux density, a negligible impact. Furthermore, the silicon steel sheet and enameled wire are closer together, making it easier to cut the magnetic flux lines, improving the efficiency of magneto-electrical conversion.

[0055] Preferably, in the motor assembly of the present disclosure, the ratio of the magnetic flux density of the stator yoke 11 to the magnetic flux density of the stator teeth 12 is within a range of 1:1.02 to 1:1.07. Preferably, the ratio of the magnetic flux density of the stator teeth 12 to the magnetic flux density of the rotor teeth 22 is within a range of 1:1.02 to 1:1.07. Preferably, the magnetic flux density of both the stator teeth 12 and the rotor teeth 22 is no greater than 1.7 Tesla. The changes in the yoke magnetic flux density of an induction motor vary when performing different tests. Calculations and actual test results show that the yoke magnetic flux density increases during motor boost and load tests, but the stator yoke 11 magnetic flux density increases more significantly than the stator teeth 12 magnetic flux density. The stator yoke 11 magnetic flux density is larger and has a longer path. Therefore, the present disclosure designs the motor so that the stator yoke 11 magnetic flux density is lower than the stator teeth 12 magnetic flux density. This not only meets more test requirements and can withstand greater load variations, but also facilitates heat transfer from the inside out of the motor. The rotor laminations 2 have relatively low iron loss, and their relatively high magnetic flux density allows for more efficient material utilization, which also facilitates heat transfer from the inside out of the motor. Taking into account the test requirements of most motors such as temperature rise and overload, and the calculation of magnetic flux density changes, it is confirmed that the ratio of the magnetic flux density of the stator yoke 11 to the magnetic flux density of the stator tooth 12 is 1:1.02~1.07, the ratio of the magnetic flux density of the stator tooth 12 to the magnetic flux density of the rotor tooth 22 is 1:1.02-1.07, and the magnetic flux density of the stator and rotor tooth yokes is not higher than 1.7 Tesla. When these characteristics are met, the motor performance is better.

[0056] In a preferred embodiment, Figure 4 As shown, the motor assembly further includes two end ring portions 24 and a plurality of guide bar portions 25 located between the two end ring portions 24. Two adjacent guide bar portions 25 are spaced apart from each other. Each guide bar portion 25 may extend at a certain angle relative to the axial direction, for example, within 45°. Each guide bar portion 25 is located in one of the rotor slots 23. Preferably, the two end ring portions 24 and the plurality of guide bar portions 25 may be, for example, die-cast onto the rotor lamination 2. The end ring portions 24 and the guide bar portions 25 are formed, for example, of aluminum. Figure 5 Two end ring portions 24 and a plurality of guide bar portions 25 extending between the two end ring portions 24 are shown in partial cross-section.

[0057] The present disclosure preferably makes the ratio of the sum of the slot areas of all rotor slots 23 to the sum of the cross-sectional areas of the two end ring portions 24 in the range of 1:0.75 to 1:1.25. Here, the "slot area of the rotor slot 23" refers to the area of the projection of the rotor slot 23 in a plane perpendicular to the longitudinal axis of the rotor sheet 2. Assume that the slot area of each rotor slot 23 is S R , then the sum of the slot areas of all rotor slots 23 is the sum of the number of rotor slots 23 and SR The “cross-sectional area of the end ring portion 24” is the area of the cross section of the end ring portion 24 taken by a plane parallel to the longitudinal axis of the rotor sheet 2. The cross-sectional area of the two end ring portions 24 includes four sub-areas, each of which is Figure 5 A is used to represent it, and its area is set to S A The sum of the cross-sectional areas of the two end ring portions 24 is 4S A Taking the embodiment in the attached figure as an example, for the case of 42 rotor slots 23, (42*S R ) / (4*S A ) values range from 1:0.75 to 1:1.25.

[0058] By ensuring that the ratio of the sum of the slot areas of all rotor slots 23 to the sum of the cross-sectional areas of the two end rings 24 is within a range of 1:0.75 to 1:1.25, the rotor induced current can be made to have similar losses when passing through the end rings 24 and the guide bar sections 25, without any additional high losses. This reduces rotor losses and improves efficiency. Furthermore, during the casting process, the flow of liquid material, such as molten aluminum, is smoother, further improving the stability of die-casting quality.

[0059] The exemplary implementation schemes proposed in the present disclosure are described in detail above with reference to preferred embodiments. However, it will be understood by those skilled in the art that, without departing from the concept of the present disclosure, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present disclosure can be combined in various ways without exceeding the scope of protection of the present disclosure, which is determined by the appended claims.

Claims

1. A motor assembly, characterized in that: include: A stator punching sheet (1), the stator punching sheet (1) comprising a stator yoke portion (11) and a plurality of stator teeth (12) extending from the stator yoke portion (11), wherein a stator slot (13) is defined between every two adjacent stator teeth (12); a rotor sheet (2) surrounded by the stator sheet (1), the rotor sheet (2) comprising a rotor yoke (21) and a plurality of rotor teeth (22) extending from the rotor yoke (21), wherein a rotor slot (23) is defined between every two adjacent rotor teeth (22); Two end ring portions (24) and a plurality of guide bar portions (25) located between the two end ring portions (24), wherein the two end ring portions (24) and the plurality of guide bar portions (25) are die-casted into one piece with the rotor punching, and each guide bar portion (25) is located in one of the rotor slots (23); The number of the stator slots (13) and the number of the rotor slots (23) are 24 and 42 respectively, and the ratio of the inner diameter (D1) to the outer diameter (D2) of the stator punching sheet (1) is within the range of 0.495-0.

535.

2. The motor assembly according to claim 1, wherein The outer diameter (D2) of the stator punching sheet (1) is in the range of 138 mm to 141 mm.

3. The motor assembly according to claim 1, wherein: The stator punching sheet (1) has a plurality of ventilation holes (14) spaced apart from each other in the circumferential direction, each ventilation hole (14) extends in the circumferential direction, and a ratio of a circumferential length (L) to a radial width (D) of the ventilation hole (14) is in the range of 6.5:1 to 7.5:

1.

4. The motor assembly according to claim 1, wherein: The ratio of the sum of the slot areas of the plurality of rotor slots (23) to the sum of the cross-sectional areas of the two end ring parts (24) is in the range of 1:0.75 to 1:1.

25.

5. The motor assembly according to claim 1, wherein: Both ends of the bottom of the stator slot (13) have rounded corner structures (26), and the radius (R) of the rounded corner structure (26) is in the range of 2 mm to 4 mm.

6. The motor assembly according to claim 1, wherein: The ratio of the magnetic flux density of the stator yoke (11) to the magnetic flux density of the stator teeth (12) is in the range of 1:1.02 to 1:1.

07.

7. The motor assembly according to claim 1, wherein: The ratio of the magnetic flux density of the stator teeth (12) to the magnetic flux density of the rotor teeth (22) is in the range of 1:1.02 to 1:1.

07.

8. The motor assembly according to claim 1, wherein: The magnetic flux density of the stator teeth (12) and the rotor teeth (22) is no higher than 1.7 Tesla.

9. A motor, characterized in that: The invention comprises a motor assembly according to any one of claims 1 to 8.

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