Induction motor

Abstract

The present disclosure relates to an induction motor. The induction motor comprises: a stator member and a rotor member. The stator member comprises: multiple annular stator laminations formed as a stack, multiple stator teeth provided on inner walls of the stator laminations facing the axis of the stator member, and a stator slot formed between every two adjacent stator teeth. The rotor member and the stator member are coaxial, and the rotor member is located between the inner walls of the stator laminations and the axis of the stator member. The rotor member comprises: a rotor lamination and a rotor winding, multiple rotor teeth being provided on the side of the rotor lamination facing the stator laminations, and a rotor slot being formed between every two adjacent rotor teeth. The ratio of the width of the stator teeth to the width of the rotor teeth in the circumferential direction is 0.75-0.88; and the ratio of the arc angles occupied by the stator slots and the rotor slots is 0.64-0.92. The induction motor provided by the embodiments of the present disclosure optimizes a magnetic circuit path, ensures the efficiency of the induction motor, and reduces induction motor vibration and noise.

Description

induction motor Technical Field

[0001] The utility model relates to the field of motors, in particular to an induction motor. Background Art

[0002] Three-phase induction motors are widely used in aerial work. During operation, the magnetic circuit parameters between the stator and rotor components are one of the important parameters for considering motor performance. Currently, many manufacturers optimize the structure of the stator and rotor components, such as changing the pole arc shape of the rotor components and chamfering the edges of the stator components, to solve the problems of magnetic path optimization and magnetic circuit uniformity in the magnetic circuit parameters. However, some disadvantages still exist. For example, the back electromotive force harmonic value of the three-phase induction motor is still at a high value, resulting in the vibration and noise generated by the three-phase induction motor during operation not meeting the expected values, and the motor power not meeting the preset requirements.

[0003] Utility Model Content

[0004] Problems to be solved by utility models

[0005] To address the problems of unsatisfactory magnetic circuit uniformity and unsatisfactory motor power in motors, an embodiment of the present disclosure provides an induction motor.

[0006] Solutions for solving problems

[0007] An embodiment of the present disclosure provides an induction motor, comprising:

[0008] A stator component, the stator component comprising: a plurality of stacked and annular stator punchings and a stator winding connected to the stator punchings, wherein the inner wall of the stator punching facing the axis of the stator component has a plurality of stator teeth, and a stator slot is formed between two adjacent stator teeth;

[0009] a rotor component, the rotor component being coaxial with the stator component and being located between the inner wall of the stator punching sheet and the axis of the stator component, the rotor component comprising: a rotor punching sheet and a rotor winding, the rotor winding being connected to the rotor punching sheet, the rotor punching sheet having a plurality of rotor teeth on a side facing the stator punching sheet, and a rotor slot being formed between two adjacent rotor teeth;

[0010] A rotating shaft, wherein the rotor punching has an axial hole, the rotating shaft is passed through the axial hole and transmits the torque generated by the rotor component;

[0011] The ratio of the width of the stator teeth to that of the rotor teeth in the circumferential direction is 0.75-0.88;

[0012] The ratio of the arc angles occupied by the stator slots and the rotor slots is 0.64-0.92.

[0013] Optionally, the circumferential width of the stator teeth is 3.6-4.0 mm, and the circumferential width of the rotor teeth is 4.5-4.8 mm; the arc angle of the stator slot is 9-11°, and the arc angle of the rotor slot is 12-14°.

[0014] Optionally, the stator slot includes, in sequence, a stator slot opening, a stator slot shoulder, and a stator slot body in a direction away from the axis of the stator component, wherein the stator slot shoulder is located between the stator slot opening and the stator slot body, and the stator slot satisfies the following ratio relationship:

[0015] The ratio between the width of the stator slot opening and the width of the stator slot shoulder is 0.4-0.7;

[0016] The ratio between the height of the stator slot and the height of the stator slot body is 0.03-0.07;

[0017] The ratio between the height of the stator slot shoulder and the width of the slot bottom of the stator slot body is 0.02-0.05; wherein the width is the width along the circumferential direction of the stator component, and the height is the height along the radial direction of the stator component.

[0018] Optionally, the hollow volume of the stator slot gradually increases from the slot bottom of the stator slot body toward the stator slot opening.

[0019] Optionally, the rotor slot includes, in sequence, a rotor slot opening, a rotor slot shoulder, and a rotor slot body, facing the axis of the stator component. The rotor slot opening faces opposite directions from the stator slot opening. The rotor slot shoulder is located between the rotor slot opening and the rotor slot body. The rotor slot satisfies at least one of the following ratio relationships:

[0020] The ratio between the width of the rotor slot and the width of the rotor slot shoulder is 0.20-0.25;

[0021] The ratio between the height of the rotor slot and the height of the rotor slot body is 0.03-0.07;

[0022] The ratio between the height of the rotor slot shoulder and the width of the rotor slot body is 0.95-1.

[0023] Optionally, the slot bottom of the stator slot body is an arc-shaped bottom, and / or the slot bottom of the rotor slot body is an arc-shaped bottom.

[0024] Optionally, the widths between the two side walls of the stator teeth are equal, and / or the widths between the two side walls of the rotor teeth are equal.

[0025] Optionally, the hollow volume of the rotor slot body gradually increases in a direction toward the stator component.

[0026] Optionally, the inner wall of the rotor slot shoulder is an inclined surface, which guides the fluid in the rotor slot body to flow toward the rotor slot opening and enables the fluid to flow out of the rotor slot opening regularly.

[0027] Optionally, the hollow volume of the rotor slot gradually increases from the rotor slot shoulder toward the stator component.

[0028] Optionally, the rotor slot passes through the rotor punching sheet; and in the axial direction of the rotor component, the rotor slot opening is formed as an oblique groove on the side wall of the rotor punching sheet.

[0029] Optionally, the inclination rate of the chute is 0.9-1.1;

[0030] The inclination rate of 0.9-1.1 indicates that: with the first end face of the rotor punching as a reference, a reference tooth is selected from the plurality of rotor teeth, the first endpoint of the skew groove starts from the reference tooth and is inclined along the axial direction of the rotor component to the intersection with the second end of the rotor punching as the second endpoint of the skew groove, and the skew groove continues to extend from the second endpoint to the end face of the second end; with the axis of the rotor component as the comparison reference for the inclination rate, the first endpoint and the second endpoint of the skew groove are offset by 0.9-1.1 rotor teeth.

[0031] Optionally, the ratio of the number of the stator slots to the number of the rotor slots is 9:7.

[0032] Optionally, the number of the stator slots is 36, and the number of the rotor slots is 28.

[0033] Optionally, the stator winding is a three-phase winding distributed along the circumference of the stator punching sheet.

[0034] Optionally, the inner diameter of the stator component is proportional to the outer diameter of the rotor component, so that the size of the gap formed between the stator component and the rotor component in the radial direction is uniform.

[0035] Optionally, a gap size formed between the stator component and the rotor component in the radial direction is 0.25-0.3 mm.

[0036] Optionally, at least one slot is provided on the outer side wall of the stator component, and the slot extends axially to each of the stator punching sheets. A connecting piece fixedly connected to each of the stator punching sheets is provided in the slot.

[0037] Optionally, the stator component has a preset height in the axial direction, the number of the slots is inversely proportional to the number of the stator sheets, and the current of the induction motor is inversely proportional to the number of the stator sheets.

[0038] Optionally, the connecting member includes a welding rod, and the outer surface of the welding rod after welding to the stator member is flush with the outer surface of the stator member, or is located in the slot body.

[0039] Effect of utility model

[0040] In the induction motor provided by the embodiments of the present disclosure, by limiting the circumferential width dimensions of the stator teeth and the rotor teeth, as well as the dimensions of the arc angles occupied by the stator slots and the rotor slot bodies, not only is the magnetic circuit path optimized and the efficiency of the induction motor ensured, but the vibration and noise of the induction motor are also reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] FIG1a is a schematic diagram of the appearance structure of a motor in some optional embodiments of the present disclosure;

[0042] FIG1b is a schematic structural diagram showing at least the stator component and the rotor component in FIG1a;

[0043] Figure 1c is an enlarged view of point a in Figure 1b;

[0044] FIG2a is a schematic diagram of the end surface structure of the stator component in FIG1b;

[0045] Figure 2b is an enlarged view of point A in Figure 2a;

[0046] FIG3 is a schematic diagram of the end structure of the rotor member in FIG1b;

[0047] Figure 4 is an enlarged view of point B in Figure 3;

[0048] FIG5 is a schematic side view of the structure of the rotor member in FIG3 ;

[0049] FIG6 is a schematic structural diagram of the rotor member in FIG5 from another perspective;

[0050] FIG7 is a schematic diagram of the three-dimensional structure of the stator component in FIG1b;

[0051] FIG8 is a schematic diagram showing simulation results of the efficiency of the motor in FIG1a.

[0052] Description of Reference Numerals

[0053] 10, first endpoint; 20, second endpoint;

[0054] 110, stator component; 110a, stator punching sheet; 110b, slot body; 111, stator slot; 111a, stator slot body; 111b, stator slot shoulder; 111c, stator slot opening; 111d, slot bottom of stator slot body; 112, stator tooth;

[0055] 120, rotor component; 120a, rotor punching; 121, rotor slot; 121a, rotor slot body; 121b, rotor slot shoulder; 121c, rotor slot opening; 121d, slot bottom of rotor slot body; 122, shaft hole; 123, skew slot; 124, rotor tooth;

[0056] 130, shaft;

[0057] 140. Casing. DETAILED DESCRIPTION

[0058] To make the technical solutions and beneficial effects of the present disclosure more clearly understood, the following detailed description is provided by way of specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly illustrate the details of the local features. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application belongs.

[0059] In the description of the present disclosure, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of a simplified description of the present disclosure, and do not indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation to the present disclosure.

[0060] In this disclosure, the terms "first" and "second" are used solely for descriptive purposes and should not be construed as indicating the relative importance of the features indicated or the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly include at least one of such features. Throughout this disclosure, "plurality" means at least two, such as two or three, and "several" means at least one, such as one, two, or three, unless otherwise specifically defined.

[0061] In this disclosure, unless otherwise expressly defined, terms such as "installed," "connected," "connect," "fixed," and "disposed" should be interpreted broadly. For example, "connection" can mean fixed, removable, or integrated; it can mean mechanical or electrical; it can mean direct or indirect connection through an intermediary; it can also mean internal communication between two components or an interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances.

[0062] In the present disclosure, unless otherwise explicitly defined, a first feature being “on,” “above,” “above,” “above,” “below,” “below,” or “below” a second feature may mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact via an intermediate medium. Moreover, a first feature being “on,” “above,” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. A first feature being “below,” “below,” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0063] The motors in the disclosed embodiments are designed for aerial work applications, meaning they are used on aerial work platforms. Compared to motors used in non-aerial work applications, these motors have higher performance requirements, such as magnetic circuit uniformity and motor efficiency.

[0064] 1a and 1b exemplarily show a schematic structural diagram of a motor. In order to clearly illustrate the structure and relative positions of the stator punching 110a and the rotor punching 120a, the stator winding and the coil winding are not shown in FIG1b.

[0065] Without limitation, the rotor punching 120 a is formed by die-casting a plurality of punchings along the axial direction, and the rotor punching 120 a is substantially cylindrical.

[0066] As shown in FIG1b , the induction motor provided by the embodiment of the present disclosure includes: a rotor component 120 and a stator component 110. The stator component 110 is coaxially distributed with the rotor component 120, and the stator component 110 is sleeved on the periphery of the rotor component 120. The stator component 110 includes a plurality of stator punchings 110a and a stator winding that are stacked and formed along the axis. The stator punchings 110a have stator slots 111. The stator winding is connected to the stator punchings 110a, for example, the stator winding is partially embedded in the stator slots 111. The rotor component 120 includes rotor punchings 120a and rotor windings. The rotor windings are connected to the rotor punchings 120a. The stator windings are in the form of wound copper wires, and the rotor windings are in the form of molten aluminum poured and solidified in the rotor slots 121. When AC current is supplied to the stator winding, stator 110 generates a rotating magnetic field. Rotor 120 cuts through this rotating magnetic field, generating an induced electromotive force and current, which in turn creates an electromagnetic torque and causes rotation. This converts the electrical energy supplied to the stator winding into mechanical energy that drives rotor 120.

[0067] As shown in FIG2a , taking one of the stator punchings 110a as an example, stator punching 110a is annular, and the inner wall of stator punching 110a facing the axis of stator component 110 has a plurality of stator teeth 112. The plurality of stator teeth 112 are evenly distributed along the circumference, and the circumferential distance between two adjacent stator teeth 112 forms a stator slot 111. As shown in FIG3 , taking one of the rotor punchings 120a as an example, rotor component 120 is located between the inner wall of stator punching 110a and the axis of stator component 110, that is, rotor component 120 is located inside stator component 110. The side of rotor punching 120a facing stator punching 110a has a plurality of rotor teeth 124, and rotor slots 121 are formed between two adjacent rotor teeth 124.

[0068] The ratio of the circumferential widths of the stator teeth 112 to the rotor teeth 124 is 0.75-0.88. For example, the ratio of the circumferential widths of the stator teeth 112 to the rotor teeth 124 can be any value among 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, 0.83, 0.85, 0.86, or 0.88, or between any two values. The ratio of the arc angles occupied by the stator slots 111 to the rotor slots 121 is 0.64-0.92. For example, the ratio of the arc angles occupied by the stator slots 111 to the rotor slots 121 can be any value among 0.64, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.91, or 0.92, or between any two values.

[0069] The rotor component 120 is located inside the stator component 110. By limiting the ratio of the circumferential widths of the stator teeth 112 to the rotor teeth 124, the magnetic field formed by the rotor component 120 in the rotor slots 121 is relatively concentrated, with less interference space. The magnetic field extends toward the periphery of the stator component 110, and the required space range becomes larger. As a result, the formed magnetic field can be evenly covered in the multiple stator slots 121, which can optimize the uniformity of the magnetic circuit and increase the power density. Specifically, each rotor tooth 124 of the rotor component 110 generates a substantially identical magnetic field. On the basis of adapting to the spatial area occupied by the magnetic field, the ratio should not be too large relative to the size of the stator component 110 (i.e., the ratio of the circumferential widths of the stator teeth 112 to the rotor teeth 124) to reduce leakage flux and ensure high efficiency of the motor.

[0070] The rotor component 120 can generate a uniform magnetic field on its circumference, and the magnetic field generated by the rotor component 120 has a density that decreases from dense to sparse as it extends toward the stator component 110. The stator component 110 is located outside the rotor component 120, and the spatial volume of the stator slots 111 is larger than the spatial volume of the rotor slots 121. By limiting the ratio of the arc angles occupied by the stator slots 111 and the rotor slots 121, the spatial volume of the stator slots 111 can be slightly larger than the spatial volume of the rotor slots 121, rather than being too large, thereby better achieving the coordination between the rotor component 110 and the stator component 120. The stator component 120 can cover the space required for the preset magnetic circuit, optimize the magnetic circuit path, reduce the back electromotive force harmonic value, and, combined with the proportional relationship between the circumferential widths of the stator teeth 112 and the rotor teeth 124, reduce the vibration and noise of the induction motor.

[0071] In the embodiment of the present disclosure, the ratio of the circumferential widths of the stator teeth 112 and the rotor teeth 124 is the ratio of the circumferential widths of the two at corresponding positions. Referring to FIG1c , the ratio of the circumferential widths of the stator teeth 112 and the rotor teeth 124 can be expressed as: the ratio of the circumferential width L1 of the stator teeth 112 to the circumferential width L2 of the rotor teeth 124, L1 / L2. Similarly, the ratio of the arc angles occupied by the stator slots 111 and the rotor slots 121 is the ratio of the arc angles at corresponding positions of the two. Referring to FIG1c , the ratio of the arc angles occupied by the stator slots 111 and the rotor slots 121 can be expressed as: the ratio of the arc angle a1 occupied by the stator slot 111 to the arc angle a2 occupied by the rotor slot 121, a1 / a2.

[0072] In some embodiments, the circumferential width of the stator teeth 112 is 3.6-4.0 mm, and the circumferential width of the rotor teeth 124 is 4.5-4.8 mm; the arc angle of the stator slots 111 is 9-11°, and the arc angle of the rotor slots 121 is 12-14°.

[0073] For example, the circumferential width of the stator teeth 112 is 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, or 4.0 mm, and the circumferential width of the rotor teeth 124 is 4.5 mm, 4.6 mm, 4.7 mm, or 4.8 mm; the arc angle of the stator slot 111 is 9°, 10°, or 11°, and the arc angle of the rotor slot 121 is 12°, 13°, or 14°.

[0074] As shown in Figures 2a and 2b, the stator slot 111 includes, in order from the axial direction of the stator component 110, a stator slot opening 111c, a stator slot shoulder 111b, and a stator slot body 111a. The stator slot shoulder 111b is located between the stator slot opening 111c and the stator slot body 111a. The inner wall of the stator slot shoulder 111b is connected to the inner wall of the stator slot body 111a and the inner wall of the stator slot opening 111c. The stator slot 111 satisfies the following ratio relationship:

[0075] The ratio between the width A of the stator slot opening 111 c and the width B of the stator slot shoulder 111 b is 0.4-0.7;

[0076] The ratio between the height C of the stator slot 111 c and the height E of the stator slot body 111 a is 0.03-0.07;

[0077] The ratio between the height D of the stator slot shoulder 111 b and the width F of the bottom of the stator slot body 111 a is 0.02-0.05.

[0078] In the embodiment of the present disclosure, the width refers to the width along the circumferential direction of the stator component 110 , and the height refers to the height along the radial direction of the stator component 110 .

[0079] By limiting the relevant dimensions at the three positions of the stator slot 111 c , the stator slot shoulder 111 b and the stator slot body 111 a of the stator slot 111 , the uniformity of the motor magnetic circuit can be ensured, thereby reducing the motor loss and improving the motor efficiency.

[0080] In the disclosed embodiment, since the stator component 110 and the rotor component 120 are coaxial, the axis of the stator component 110 coincides with the axis of the rotor component 120. The circumferential direction of the stator component 110 is the same as the circumferential direction of the rotor component 120, the radial direction of the stator component 110 is the same as the radial direction of the rotor component 120, and the axial direction of the stator component 110 is also the same as the axial direction of the rotor component 120. Generally, the axis of the stator component 110 coincides with the axis of the motor.

[0081] Optionally, the ratio between the width of the stator slot opening 111 c and the width of the stator slot shoulder 111 b is 0.4, 0.5, 0.6 or 0.7.

[0082] Optionally, the ratio of the height of the stator slot 111 c to the height of the stator slot body 111 a is 0.03, 0.04, 0.05, 0.06 or 0.07.

[0083] Optionally, the ratio of the height of the stator slot shoulder 111 b to the width of the slot bottom 111 d of the stator slot body 111 a is 0.02, 0.03, 0.04 or 0.05.

[0084] As shown in FIG. 2 a and FIG. 2 b , according to some optional embodiments, the hollow volume of the stator slot 111 gradually increases from the slot bottom 111 d of the stator slot body 111 a toward the stator slot opening 111 c .

[0085] Combined with the above-mentioned size limitation on the stator slot 111 and the pear shape of the stator slot 111 being narrow inside and wide outside, the uniformity of the magnetic circuit can be further ensured, the motor loss can be reduced, and the motor efficiency can be improved.

[0086] In the embodiment of the present disclosure, “inner” refers to the side close to the axis of the stator component 110 , and “outer” refers to the other side away from the axis of the stator component 110 .

[0087] As shown in FIG3 and FIG4 , according to some optional embodiments, the rotor slot 121 includes, in sequence, a rotor slot opening 121c, a rotor slot shoulder 121b, and a rotor slot body 121a in the direction of the axis of the stator component 110. The rotor slot 121c faces oppositely to the stator slot 111c. The rotor slot shoulder 121b is located between the rotor slot opening 121c and the rotor slot body 121a. The rotor slot 121 satisfies at least one of the following ratio relationships:

[0088] The ratio between the width a of the rotor slot opening 121c and the width b of the rotor slot shoulder 121b is 0.20-0.25;

[0089] The ratio between the height d of the rotor slot 121c and the height f of the rotor slot body 121a is 0.03-0.07;

[0090] The ratio between the height e of the rotor slot shoulder 121 b and the width c of the rotor slot body 121 a is 0.95-1.

[0091] By limiting the relevant dimensions at the rotor slot opening 121 c , the rotor slot shoulder 121 b and the rotor slot body 121 a of the rotor slot 121 , the uniformity of the magnetic circuit can be ensured, thereby reducing motor losses and improving motor efficiency.

[0092] According to some optional embodiments, the slot bottom 111d of the stator slot body 111a is an arc-shaped bottom, and / or the slot bottom 121d of the rotor slot body 121a is an arc-shaped bottom, that is, a round-bottomed slot is formed.

[0093] FIG. 2 a to FIG. 4 exemplarily show that the bottom of the stator slot body 111 a and the slot bottom 121 d of the rotor slot body are both arc-shaped bottoms.

[0094] Compared to flat-bottomed slots with straight bottoms in the rotor slot body and / or flat-bottomed slots with straight bottoms 111d in the stator slot body 111a, arc-shaped bottoms improve the filling of the enameled wire during wire insertion (referring to the enameled wire forming the stator winding and / or rotor winding), making the insulating outer protective layer of the enameled wire less susceptible to damage. While maintaining the same slot fill ratio, round-bottomed slots with avoidance space are easier to insert wire into. It is also worth noting that round-bottomed slots have low magnetic flux leakage and excellent magnetic properties.

[0095] As shown in Figures 2a to 4, according to some optional embodiments, the width of the stator teeth 112 relative to the two side walls is equal everywhere, that is, the stator teeth 112 are parallel teeth; and / or the width of the rotor teeth 124 relative to the two side walls is equal everywhere, that is, the rotor teeth 124 are parallel teeth.

[0096] The combination of the parallel teeth and the circular bottom slots, as well as the above-mentioned size restrictions on the stator slots 111 and the rotor slots 121, can further ensure the uniformity of the motor magnetic circuit and further improve the motor efficiency.

[0097] According to some optional embodiments, the diameter of the stator sheet 110a is 5.4-5.5 mm.

[0098] For example, the diameter of the stator punching sheet 110a is 5.4 or 5.5 mm.

[0099] According to some optional embodiments, the hollow volume of the rotor slot body 121 a gradually increases in a direction toward the stator component 110 .

[0100] As shown in FIG3 and FIG4 , the rotor slot 121 is narrow inside and wide outside, which can help ensure the uniformity of the magnetic circuit, reduce motor losses, and improve motor efficiency.

[0101] As shown in FIG3 and FIG4 , according to some optional embodiments, the inner wall of the rotor slot shoulder 121b is a slope, which guides the fluid in the rotor slot body 121a toward the rotor slot opening 121c and enables the fluid to flow out of the rotor slot opening 121c regularly.

[0102] The rotor slot 121 generally needs to be poured with molten iron and aluminum (i.e., the fluid flowing in the rotor slot 121). The rotor slot shoulder 121b is set as an inclined surface, which can guide the flow of molten aluminum flowing to the rotor slot opening 121c, so that the molten aluminum flows out regularly.

[0103] As shown in Figure 4 , according to some optional embodiments, the hollow volume of rotor slot 121c gradually increases from rotor slot shoulder 121b toward stator 110. This open-slot design of rotor slot 121c allows some molten aluminum to flow out of rotor slot 121, preventing the occurrence of ripples caused by excessive surge fluctuations. Furthermore, the open-slot design of rotor slot 121c reduces leakage reactance, thereby reducing starting current and improving motor efficiency.

[0104] The rotor punching 120a is a round-bottomed groove with an open groove at the groove opening. Combined with the fact that "the ratio between the width of the rotor groove opening 121c and the width of the rotor groove shoulder 121b is 0.20-0.25", it can be seen that the radial cross-sectional dimension of the rotor groove 121 is wide in the middle and narrow on both sides. When molten aluminum is poured into the rotor groove 121 along the axis of the rotor part 120, the molten aluminum fills the middle part of the groove body (i.e., the middle part of the rotor groove body 121a) and then has a tendency to surge toward both sides (referring to the groove bottom 121d of the rotor groove body, the rotor groove shoulder 121b, and the rotor groove opening 121c), making it easier to fill both sides of the rotor groove 121.

[0105] As shown in FIG5 and FIG6 , according to some optional embodiments, the rotor slot 121 penetrates the rotor punching 120 a ; in the axial direction of the rotor member 120 , the rotor notch 121 c is formed as an oblique groove 123 on the side wall of the rotor punching 120 a .

[0106] The inclined slot 123 is helpful to reduce the harmonic components of the motor and reduce the electromagnetic noise of the motor.

[0107] As shown in Figure 6, the inclination of the skewed slot 123 is 0.9-1.1. This inclination indicates that, with the first end face of the rotor sheet 120a as a reference, a reference tooth is selected from the plurality of rotor teeth 124. The first endpoint 10 of the skewed slot 123 begins at the reference tooth and tilts axially along the rotor member 120 to the intersection with the second end of the rotor sheet 120a, which serves as the second endpoint 20 of the skewed slot 123. The skewed slot 123 then extends from the second endpoint 20 to the end face of the second end. With the axis N of the rotor member 120 as the reference for comparison of the inclination, the first endpoint 10 and the second endpoint 20 of the skewed slot 123 are offset by 0.9-1.1 rotor teeth 124. The dashed line M in Figure 6 represents the line connecting the first endpoint 10 and the second endpoint 20.

[0108] The design of the skewed groove 123 of the rotor slot 121 on the circumferential side of the rotor punching 120a, combined with the slope of the skewed groove 123, can further reduce the harmonic components of the motor and further reduce the electromagnetic noise of the motor.

[0109] Optionally, the inclination rate of the inclined groove 123 is 0.9, 1.0 or 1.1.

[0110] According to some optional embodiments, the ratio of the number of stator slots 111 to the number of rotor slots 121 is 9:7. For example, the number of stator slots 111 is 36, and the number of rotor slots 121 is 28. By properly designing the number of stator slots 111 and rotor slots 121, electromagnetic noise is reduced to a certain extent, while also facilitating improved motor efficiency.

[0111] According to some optional embodiments, the stator winding is a three-phase winding distributed along the circumference of the stator sheet 110a. In other words, the induction motor of the present disclosure can be a three-phase induction motor, which is more suitable for high-altitude operations.

[0112] For example, the three-phase induction motor has a rated power of 870 W and a rotational speed of 1900 rpm.

[0113] As shown in FIG. 1 a and FIG. 1 b , the induction motor further includes a rotating shaft 130 . The rotor punching 120 a has an axial hole 122 coaxial with the stator component 110 . The rotating shaft 130 passes through the axial hole 122 and transmits the torque generated by the rotor component 120 .

[0114] As shown in FIG. 1 a and FIG. 1 b , the induction motor further includes a housing 140 mounted outside the stator component 110 . The housing 140 protects the rotor component 120 , the stator component 110 and other components.

[0115] The inner diameter of the stator component 110 is proportional to the outer diameter of the rotor component 120, so that the gap size formed in the radial direction between the stator component 110 and the rotor component 120 is uniform. That is, the gap between the stator component 110 and the rotor component 120 in the radial direction is equal everywhere along the circumferential direction. In some embodiments, the gap size formed in the radial direction between the stator component 110 and the rotor component 120 is 0.25-0.3 mm. For example, the gap size formed in the radial direction between the stator component 110 and the rotor component 120 can be 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, 0.29 mm or 0.3 mm. This gap setting between the stator component 110 and the rotor component 120 can ensure the uniformity of the magnetic circuit, reduce leakage magnetic flux, and thus ensure the stability of the starting torque of the induction motor, thereby achieving the high rated efficiency of the induction motor.

[0116] As shown in FIG7 , optionally, at least one slot 110 b is provided on the outer wall of the stator component 110. The slot 110 b extends axially to each stator punching 110 a. A connector fixedly connected to each stator punching 110 a is provided in the slot 110 b. The provision of the slot 110 b is conducive to reducing the weight of the stator component 110. When multiple stator punchings 110 a are stacked together, within a preset height, if the number of stator punchings 110 a is small (e.g., less than a preset number of sheets), the adhesion between adjacent stator punchings 110 a may deteriorate. By adding a connector, the connection between the stator punchings 110 a can be strengthened, thereby ensuring the reliability of the connection.

[0117] In some embodiments, the stator component 110 has a preset height in the axial direction, the number of the slots 110 b is inversely proportional to the number of the stator sheets 110 a , and the current of the induction motor is inversely proportional to the number of the stator sheets 110 a .

[0118] Multiple stator punching sheets 110a are stacked together. Within a preset height, the fewer the number of stator punching sheets 110a, the worse the adhesion between two adjacent stator punching sheets 110a. More slots 110b also mean more connecting parts, which in turn better reinforces the stator punching sheets 110a.

[0119] Optionally, the connecting member includes a welding rod, and the outer surface of the welding rod after being welded to the stator component 110 is flush with the outer surface of the stator component 110 or is located in the slot body 110b.

[0120] Within the preset height, the number of stator laminations 110a is less than the preset number, and the reliability of the connection can be ensured by adding welding rods. When the number of stator laminations 110a reaches or exceeds the preset number, the slot body 110b can be used to reduce weight.

[0121] Figure 8 exemplarily illustrates the electromagnetic simulation results of an induction motor having features of the above-described embodiment, including an induction motor efficiency MAP diagram (ignition control curve diagram). The abscissa in Figure 8 generally represents the motor speed (in rpm) of the induction motor, and the ordinate represents the motor load-torque (in Nm) of the induction motor. As shown in Figure 8 , the maximum efficiency of the induction motor is 80.78%. In this MAP diagram, 80% efficiency (referring to the efficiency of the induction motor) accounts for 1.56%, 85% efficiency accounts for 0%, and 90% efficiency accounts for 0%. The maximum efficiency of the induction motor exceeds 80%.

[0122] The features disclosed in the product embodiments provided in this disclosure can be arbitrarily combined without conflict to obtain new product embodiments.

[0123] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of the present disclosure that may not be explicitly described. Therefore, the above embodiments only express several implementations of the present disclosure and do not limit the scope of protection of the patent of the present disclosure.

Claims

1. An induction motor, characterized in that: The induction motor comprises: A stator component (110), the stator component (110) comprising: a plurality of stacked and annular stator punching sheets (110a) and a stator winding connected to the stator punching sheets (110a), the inner wall of the stator punching sheet (110a) facing the axis of the stator component (110) having a plurality of stator teeth (112), and a stator slot (111) formed between two adjacent stator teeth (112); A rotor component (120), the rotor component (120) being coaxial with the stator component (110) and being located between the inner wall of the stator punching sheet (110a) and the axis of the stator component (110), the rotor component (120) comprising: a rotor punching sheet (120a) and a rotor winding, the rotor winding being connected to the rotor punching sheet (120a), the rotor punching sheet (120a) having a plurality of rotor teeth (124) on one side facing the stator punching sheet (110a), and a rotor slot (121) being formed between two adjacent rotor teeth (124); A rotating shaft (130), wherein the rotor punching sheet (120a) has an axial hole (122), and the rotating shaft (130) is inserted into the axial hole (122) and transmits the torque generated by the rotor component (120); The ratio of the widths of the stator teeth (112) and the rotor teeth (124) in the circumferential direction is 0.75-0.88; The ratio of the arc angles occupied by the stator slots (111) and the rotor slots (121) is 0.64-0.

92.

2. The induction motor according to claim 1, characterized in that The width of the stator teeth (112) in the circumferential direction is 3.6-4.0 mm, and the width of the rotor teeth (124) in the circumferential direction is 4.5-4.8 mm; the arc angle of the stator slot (111) is 9-11°, and the arc angle of the rotor slot (121) is 12-14°.

3. The induction motor according to claim 1, characterized in that The stator slot (111) includes, in sequence, in a direction away from the axis of the stator component (110): a stator slot opening (111c), a stator slot shoulder (111b) and a stator slot body (111a); the stator slot shoulder (111b) is located between the stator slot opening (111c) and the stator slot body (111a); and the stator slot (111) satisfies the following ratio relationship: The ratio between the width of the stator slot opening (111c) and the width of the stator slot shoulder (111b) is 0.4-0.7; The ratio between the height of the stator slot (111c) and the height of the stator slot body (111a) is 0.03-0.07; The ratio between the height of the stator slot shoulder (111b) and the width of the slot bottom (111d) of the stator slot body (111a) is 0.02-0.05; wherein the width is the width along the circumferential direction of the stator component (110), and the height is the height along the radial direction of the stator component (110).

4. The induction motor according to claim 3, characterized in that The hollow volume of the stator slot (111) gradually increases from the slot bottom (111d) of the stator slot body (111a) toward the stator slot opening (111c).

5. The induction motor according to claim 3, characterized in that: The rotor slot (121) includes, in sequence, a rotor slot opening (121c), a rotor slot shoulder (121b) and a rotor slot body (121a) in the direction of the axis of the stator component (110); the rotor slot opening (121c) and the stator slot opening (111c) are oriented in opposite directions; the rotor slot shoulder (121b) is located between the rotor slot opening (121c) and the rotor slot body (121a); ​​and the rotor slot (121) satisfies at least one of the following ratio relationships: The ratio between the width of the rotor slot (121c) and the width of the rotor slot shoulder (121b) is 0.20-0.25; The ratio between the height of the rotor slot (121c) and the height of the rotor slot body (121a) is 0.03-0.07; The ratio between the height of the rotor slot shoulder (121b) and the width of the rotor slot body (121a) is 0.95-1.

6. The induction motor according to claim 5, characterized in that The slot bottom (111d) of the stator slot body (111a) is an arc-shaped bottom, and / or the slot bottom (121d) of the rotor slot body (121a) is an arc-shaped bottom.

7. The induction motor according to claim 3, characterized in that The width between two side walls of the stator teeth (112) is equal, and / or the width between two side walls of the rotor teeth (124) is equal.

8. The induction motor according to claim 5, characterized in that The hollow volume of the rotor slot body (121a) gradually increases in a direction toward the stator component (110).

9. The induction motor according to claim 8, characterized in that The inner wall of the rotor slot shoulder (121b) is an inclined surface, which guides the fluid in the rotor slot body (121a) to flow toward the rotor slot opening (121c), and enables the fluid to flow out of the rotor slot opening (121c) in a regular manner.

10. The induction motor according to claim 9, characterized in that The hollow volume of the rotor slot (121c) gradually increases from the rotor slot shoulder (121b) toward the stator component (110).

11. The induction motor according to claim 5, characterized in that The rotor slot (121) penetrates the rotor punching sheet (120a); in the axial direction of the rotor component (120), the rotor notch (121c) is formed as an oblique slot (123) on the side wall of the rotor punching sheet (120a).

12. The induction motor according to claim 11, characterized in that The inclination rate of the inclined groove (123) is 0.9-1.1; The inclination rate of 0.9-1.1 indicates that: taking the first end face of the rotor punching (120a) as a reference, a reference tooth is selected from the plurality of rotor teeth (124); the first end point (10) of the inclined groove (123) starts from the reference tooth and is inclined along the axial direction of the rotor component (120) to the intersection with the second end of the rotor punching (120a) as the second end point (20) of the inclined groove (123); the inclined groove (123) continues to extend from the second end point (20) to the end face of the second end; taking the axis of the rotor component (120) as the comparison reference of the inclination rate, the first end point (10) and the second end point (20) of the inclined groove (123) are offset by 0.9-1.1 of the rotor teeth (124).

13. The induction motor according to claim 1, characterized in that The ratio of the number of the stator slots (111) to the number of the rotor slots (121) is 9:

7.

14. The induction motor according to claim 13, characterized in that The number of the stator slots (111) is 36, and the number of the rotor slots (121) is 28.

15. The induction motor according to claim 1, characterized in that The stator winding is a three-phase winding distributed along the circumference of the stator punching sheet (110a).

16. The induction motor according to claim 1, characterized in that The inner diameter of the stator component (110) is in direct proportion to the outer diameter of the rotor component (120), so that the size of the gap formed between the stator component (110) and the rotor component (120) in the radial direction is uniform.

17. The induction motor according to claim 16, characterized in that The size of the gap formed between the stator component (110) and the rotor component (120) in the radial direction is 0.25-0.3 mm.

18. The induction motor according to claim 1, characterized in that At least one slot body (110b) is provided on the outer side wall of the stator component (110), and the slot body (110b) extends axially to each of the stator punching sheets (110a). A connecting piece fixedly connected to each of the stator punching sheets is provided in the slot body (110b).

19. The induction motor according to claim 18, characterized in that The stator component (110) has a preset height in the axial direction, the number of the slot bodies (110b) is inversely proportional to the number of the stator punching sheets (110a), and the current of the induction motor is inversely proportional to the number of the stator punching sheets (110a).

20. The induction motor according to claim 18, characterized in that The connecting member comprises a welding rod, and the outer surface of the welding rod after being welded to the stator member (110) is arranged flush with the outer surface of the stator member (110) or is located in the slot body (110b).

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