Induction motor

Abstract

The invention relates to an induction motor, the induction motor comprises a stator part and a rotor part, the stator part comprises a plurality of stator punching sheets which are formed through lamination and are in an annular shape, the inner wall, facing the axis of the stator part, of each stator punching sheet is provided with a plurality of stator teeth, and a stator groove is formed between every two adjacent stator teeth; the rotor part is coaxial with the stator part and located between the inner wall of the stator punching sheet and the axis of the stator part, the rotor part comprises a rotor punching sheet and a rotor winding, one side, facing the stator punching sheet, of the rotor punching sheet is provided with a plurality of rotor teeth, and a rotor groove is formed between every two adjacent rotor teeth; the width ratio of the stator teeth to the rotor teeth in the circumferential direction is 0.75-0.88; and the ratio of the circular arc angles of the stator slots and the rotor slots is 0.64-0.92. According to the induction motor provided by the embodiment of the invention, the magnetic path is optimized, the efficiency of the induction motor is ensured, and the vibration and noise of the induction motor are reduced.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to an induction motor. Background Art

[0002] In the field of aerial work, three-phase induction motors are widely used. During the working process, the magnetic circuit parameters between the stator and rotor parts are one of the important parameters for considering the performance of the motor. At present, many manufacturers optimize the structure of the stator and rotor parts, such as changing the pole arc shape of the rotor parts, chamfering the edges of the stator parts, etc., to solve the problems of magnetic path optimization and magnetic circuit uniformity in the magnetic circuit parameters, but there are still some disadvantages. For example, the back electromotive force harmonic value of the three-phase induction motor is still at a high value, causing the vibration and noise generated by the three-phase induction motor during operation to fail to meet the expected values, and the motor power does not meet the preset requirements. Summary of the invention

[0003] Problem that the invention aims to solve

[0004] In order to solve the problems of unsatisfactory magnetic circuit uniformity and unsatisfactory motor power in a motor, an embodiment of the present disclosure provides an induction motor.

[0005] Solutions for solving problems

[0006] An embodiment of the present disclosure provides an induction motor, the induction motor comprising:

[0007] A stator component, the stator component comprising: a plurality of stacked and annular stator punching sheets and a stator winding connected to the stator punching sheets, the inner wall of the stator punching sheet facing the axis of the stator component having a plurality of stator teeth, and a stator slot is formed between two adjacent stator teeth;

[0008] A rotor component, the rotor component is coaxial with the stator component and is located between the inner wall of the stator punching sheet and the axis of the stator component, the rotor component comprises: a rotor punching sheet and a rotor winding, the rotor winding is connected to the rotor punching sheet, the rotor punching sheet has a plurality of rotor teeth on one side facing the stator punching sheet, and a rotor slot is formed between two adjacent rotor teeth;

[0009] A rotating shaft, wherein the rotor punching sheet has an axial hole, the rotating shaft is passed through the axial hole and transmits the torque generated by the rotor member;

[0010] The ratio of the width of the stator teeth to that of the rotor teeth in the circumferential direction is 0.75-0.88;

[0011] The ratio of the arc angles occupied by the stator slots and the rotor slots is 0.64-0.92.

[0012] 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°.

[0013] Optionally, the stator slots away from the axial direction of the stator component include: a stator slot opening, a stator slot shoulder and a stator slot body in sequence, the stator slot shoulder is located between the stator slot opening and the stator slot body, and the stator slots satisfy the following ratio relationship:

[0014] The ratio between the width of the stator slot opening and the width of the stator slot shoulder is 0.4-0.7;

[0015] The ratio between the height of the stator slot and the height of the stator slot body is 0.03-0.07;

[0016] 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.

[0017] Optionally, the hollow volume of the stator slot gradually increases from the slot bottom of the stator slot body toward the stator slot opening.

[0018] Optionally, the rotor slot includes, in sequence, a rotor slot opening, a rotor slot shoulder and a rotor slot body, facing the axial direction of the stator component, the rotor slot opening and the stator slot opening are facing oppositely, the rotor slot shoulder is located between the rotor slot opening and the rotor slot body, and the rotor slot satisfies at least one of the following ratio relationships:

[0019] The ratio between the width of the rotor slot and the width of the rotor slot shoulder is 0.20-0.25;

[0020] The ratio between the height of the rotor slot and the height of the rotor slot body is 0.03-0.07;

[0021] The ratio between the height of the rotor slot shoulder and the width of the rotor slot body is 0.95-1.

[0022] 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.

[0023] Optionally, the width between two side walls of the stator teeth is equal, and / or the width between two side walls of the rotor teeth is equal.

[0024] Optionally, the hollow volume of the rotor slot body gradually increases in a direction toward the stator component.

[0025] 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.

[0026] Optionally, the hollow volume of the rotor slot gradually increases from the rotor slot shoulder toward the stator component.

[0027] Optionally, the rotor slot passes through the rotor punching sheet; in the axial direction of the rotor component, the rotor notch is formed as an oblique groove on the side wall of the rotor punching sheet.

[0028] Optionally, the inclination rate of the chute is 0.9-1.1;

[0029] The inclination rate of 0.9-1.1 means that: taking the first end face of the rotor punching as a reference, a reference tooth is selected from the plurality of rotor teeth, the first end point of the inclined groove starts from the reference tooth, and is inclined along the axial direction of the rotor part to the intersection with the second end of the rotor punching as the second end point of the inclined groove, and the inclined groove continues to extend from the second end point to the end face of the second end; taking the axis of the rotor part as the comparison reference of the inclination rate, the first end point and the second end point of the inclined groove are offset by 0.9-1.1 of the rotor teeth.

[0030] Optionally, the ratio of the number of the stator slots to the number of the rotor slots is 9:7.

[0031] Optionally, the number of the stator slots is 36, and the number of the rotor slots is 28.

[0032] Optionally, the stator winding is a three-phase winding distributed along the circumference of the stator punching sheet.

[0033] 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.

[0034] Optionally, a gap size formed between the stator component and the rotor component in the radial direction is 0.25-0.3 mm.

[0035] Optionally, at least one slot is formed on the outer side wall of the stator component, the slot extends axially to each of the stator punching sheets, and a connecting piece fixedly connected to each of the stator punching sheets is provided in the slot.

[0036] 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.

[0037] Optionally, the connecting member includes a welding rod, and the outer surface of the welding rod after welding with the stator member is flush with the outer surface of the stator member, or is located in the slot body.

[0038] Effects of the Invention

[0039] In the induction motor provided by the embodiment of the present disclosure, by limiting the width dimensions of the stator teeth and the rotor teeth in the circumferential direction, as well as the dimensions of the arc angles occupied by the stator slots and the rotor slots, not only the magnetic circuit path is optimized and the efficiency of the induction motor is ensured, but also the vibration and noise of the induction motor are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1a This is a schematic diagram of the appearance structure of a motor in some optional embodiments of the present disclosure;

[0041] Figure 1b To show at least Figure 1a A schematic diagram of the structure of the stator and rotor parts;

[0042] Figure 1c for Figure 1b The enlarged view of point a in the middle;

[0043] Figure 2a for Figure 1b Schematic diagram of the end face structure of the middle stator component;

[0044] Figure 2b for Figure 2a The enlarged view of point A in the middle;

[0045] Figure 3 for Figure 1b A schematic diagram of the end structure of the middle rotor component;

[0046] Figure 4 for Figure 3 The enlarged view of point B in the middle;

[0047] Figure 5 for Figure 3 A schematic diagram of the side structure of the middle rotor component;

[0048] Figure 6 for Figure 5 A schematic diagram of the structure of the middle rotor component from another perspective;

[0049] Figure 7 for Figure 1b A schematic diagram of the three-dimensional structure of the middle stator;

[0050] Figure 8 for Figure 1a Schematic diagram of simulation results of the motor efficiency.

[0051] Description of Reference Numerals

[0052] 10. first endpoint; 20. second endpoint;

[0053] 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;

[0054] 120, rotor part; 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;

[0055] 130, shaft;

[0056] 140. Casing. DETAILED DESCRIPTION

[0057] In order to make the technical solutions and beneficial effects of the present disclosure more obvious and easy to understand, the following is a detailed description by listing specific embodiments. The drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meaning as those in the technical field to which the present application belongs.

[0058] In the description of the present disclosure, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of simplified description of the present disclosure, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present disclosure.

[0059] In the present disclosure, the terms "first" and "second" are used only for the purpose of clear description and should not be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly include at least one of the features. In the description of the present disclosure, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise clearly and specifically defined.

[0060] In the present disclosure, unless otherwise clearly defined, the terms "install", "connect", "connect", "fix", "set", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0061] In the present disclosure, unless otherwise clearly defined, a first feature being “on”, “above”, “above”, “below”, “below”, “below” or “below” a second feature may mean that the first feature is in direct contact with the second feature, or the first feature and the second feature are in indirect contact with each other through 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 the horizontal height 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 the horizontal height of the second feature.

[0062] The motor of the embodiment of the present disclosure is a motor for aerial work, that is, the motor of the embodiment of the present disclosure is used on an aerial work platform. Compared with motors in non-aerial work fields, motors in the aerial work field have higher requirements on motor performance such as magnetic circuit uniformity and motor efficiency.

[0063] Figure 1a and Figure 1b A schematic diagram of the structure of a motor is shown as an example. In order to clearly show the structure and relative position of the stator punching sheet 110a and the rotor punching sheet 120a, Figure 1b The stator winding and coil winding are not shown.

[0064] 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.

[0065] like Figure 1bAs shown, the induction motor provided by the embodiment of the present disclosure includes: a rotor part 120 and a stator part 110, wherein the stator part 110 is coaxially distributed with the rotor part 120, and the stator part 110 is sleeved on the periphery of the rotor part 120. The stator part 110 includes a plurality of stator punchings 110a and a stator winding formed along the axis, wherein the stator punchings 110a have stator slots 111, and 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 part 120 includes a rotor punching 120a and a rotor winding, and the rotor winding is connected to the rotor punching 120a. The stator winding is in the form of a wound copper wire, and the rotor winding is in the form of an aluminum liquid poured and solidified in the rotor slots 121. After the alternating current is supplied to the stator winding, the stator 110 generates a rotating magnetic field, and the rotor 120 cuts the rotating magnetic field of the stator 110 to generate an induced electromotive force and current, and forms an electromagnetic torque to rotate, thereby realizing the conversion of the electrical energy supplied to the stator winding into the mechanical energy of the rotor 120 rotation.

[0066] like Figure 2a As shown, taking one of the stator punching sheets 110a as an example, the stator punching sheet 110a is annular, and the inner wall of the stator punching sheet 110a facing the axis of the stator component 110 has a plurality of stator teeth 112, and the plurality of stator teeth 112 are evenly distributed along the circumferential direction, and the circumferential distance between two adjacent stator teeth 112 forms a stator slot 111. Figure 3 As shown, taking one of the rotor sheets 120a as an example, the rotor member 120 is located between the inner wall of the stator sheet 110a and the axis of the stator member 110, that is, the rotor member 120 is located inside the stator member 110. The rotor sheet 120a has a plurality of rotor teeth 124 on one side facing the stator sheet 110a, and a rotor slot 121 is formed between two adjacent rotor teeth 124.

[0067] The ratio of the width of the stator teeth 112 to the rotor teeth 124 in the circumferential direction is 0.75-0.88; for example, the ratio of the width of the stator teeth 112 to the rotor teeth 124 in the circumferential direction 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 and the rotor slots 121 is 0.64-0.92. For example, the ratio of the arc angles occupied by the stator slots 111 and 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.

[0068] The rotor component 120 is located inside the stator component 110, and by limiting the ratio of the widths of the stator teeth 112 and the rotor teeth 124 in the circumferential direction, the magnetic field formed by the rotor component 120 in the rotor slot 121 is relatively concentrated, with less interference space, and extends toward the outer stator component 110, and the required space range becomes larger, so that the formed magnetic field can be evenly covered in multiple stator slots 121, which can optimize the uniformity of the magnetic circuit and improve the power density. Among them, each rotor tooth 124 of the rotor component 110 generates an approximately identical magnetic field, which, on the basis of adapting to the spatial area occupied by the magnetic field, should not be too large in ratio relative to the size of the stator component 110 (i.e., the ratio of the widths of the stator teeth 112 and the rotor teeth 124 in the circumferential direction) to reduce leakage magnetic flux and ensure the high efficiency of the motor.

[0069] The rotor component 120 can generate a uniform magnetic field on its circumference, and the magnetic field generated by the rotor component 120 increases in density from dense to sparse during the process of extending toward the stator component 110. The stator component 110 is located outside the rotor component 120, and the spatial volume of the stator slot 111 is larger than the spatial volume of the rotor slot 121. By limiting the ratio of the arc angles occupied by the stator slot 111 and the rotor slot 121, the spatial volume of the stator slot 111 can be slightly larger than the spatial volume of the rotor slot 121, rather than being too large, so that the rotor component 110 and the stator component 120 can be better matched. 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 widths of the stator teeth 112 and the rotor teeth 124 in the circumferential direction, the vibration and noise of the induction motor can be reduced.

[0070] In the embodiment of the present disclosure, the ratio of the widths of the stator teeth 112 and the rotor teeth 124 in the circumferential direction is the ratio of the circumferential widths at corresponding positions of the two. Figure 1c As shown, the ratio of the width of the stator tooth 112 and the rotor tooth 124 in the circumferential direction can be expressed as: the ratio of the width L1 of the stator tooth 112 in the circumferential direction to the width L2 of the rotor tooth 124 in the circumferential direction L1 / L2. Similarly, the ratio of the arc angles occupied by the stator slot 111 and the rotor slot 121 is the ratio of the arc angles at the corresponding positions of the two, refer to Figure 1c As shown, the ratio of the arc angles occupied by the stator slot 111 and the rotor slot 121 can be expressed as: the ratio a1 / a2 of the arc angle a1 occupied by the stator slot 111 to the arc angle a2 occupied by the rotor slot 121.

[0071] 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°.

[0072] For example, the circumferential width of the stator tooth 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 tooth 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°.

[0073] like Figure 2a and Figure 2b As shown, the stator slot 111 away from the axial direction of the stator member 110 includes: a stator slot opening 111c, a stator slot shoulder 111b and a stator slot body 111a in sequence, the stator slot shoulder 111b is located between the stator slot opening 111c and the stator slot body 111a, and the inner wall of the stator slot shoulder 111b is respectively 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:

[0074] The ratio between the width A of the stator slot opening 111c and the width B of the stator slot shoulder 111b is 0.4-0.7;

[0075] The ratio between the height C of the stator slot 111c and the height E of the stator slot body 111a is 0.03-0.07;

[0076] 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.

[0077] 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 .

[0078] 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.

[0079] In the embodiment of the present disclosure, 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.

[0080] 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.

[0081] Optionally, the ratio between the height of the stator slot 111 c and the height of the stator slot body 111 a is 0.03, 0.04, 0.05, 0.06 or 0.07.

[0082] Optionally, the ratio between the height of the stator slot shoulder 111 b and 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.

[0083] like Figure 2a and Figure 2b As shown, according to some optional embodiments, 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.

[0084] Combined with the above-mentioned size limitation on the stator slot 111 and the pear shape of the stator slot 111 which is 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.

[0085] In the embodiment of the present disclosure, “inner” refers to a 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 .

[0086] like Figure 3 and Figure 4 As shown, according to some optional embodiments, the rotor slot 121 includes, in sequence, a rotor slot 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 and the stator slot 111c are in opposite directions, the rotor slot shoulder 121b is located between the rotor slot 121c and the rotor slot body 121a, and the rotor slot 121 satisfies at least one of the following ratio relationships:

[0087] 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;

[0088] 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;

[0089] 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.

[0090] By limiting the relevant dimensions at the three positions of the rotor slot 121, namely, the rotor slot opening 121c, the rotor slot shoulder 121b and the rotor slot body 121a, the uniformity of the magnetic circuit can be ensured, thereby reducing the motor loss and improving the motor efficiency.

[0091] 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.

[0092] Figures 2a to 4 It is exemplarily shown 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.

[0093] Compared with the flat bottom slot of the rotor slot body with a straight bottom, and / or, compared with the flat bottom slot of the slot bottom 111d of the stator slot body 111a with a straight bottom, the arc bottom can improve the filling of the enameled wire during the wire embedding (referring to the enameled wire forming the stator winding and / or the enameled wire forming the rotor winding), and the outer protective layer of the insulating enameled wire is not easy to be damaged. Under the same slot filling rate requirement, it is easier to embed the wire in the round bottom slot with avoidance space. It is also worth noting that the round bottom slot has small magnetic leakage and good magnetic properties.

[0094] like Figures 2a to 4 As shown, 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.

[0095] The combination of the parallel teeth and the above-mentioned round bottom slots, as well as the above-mentioned related 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.

[0096] According to some optional embodiments, the diameter of the stator punching sheet 110a is 5.4-5.5 mm.

[0097] For example, the diameter of the stator punching sheet 110a is 5.4 or 5.5 mm.

[0098] 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 .

[0099] like Figure 3 and Figure 4 As shown, 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.

[0100] like Figure 3 and Figure 4 As shown, according to some optional embodiments, 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 regularly.

[0101] The rotor slot 121 generally needs to be poured with molten iron and aluminum (i.e., the fluid flowing in the rotor slot 121 ), and the rotor slot shoulder 121 b is arranged in an inclined surface, which can guide the flow of molten aluminum flowing to the rotor slot opening 121 c, so that the molten aluminum flows out regularly.

[0102] like Figure 4 As shown, according to some optional embodiments, the hollow volume of the rotor slot 121c gradually increases from the rotor slot shoulder 121b to the stator 110. The open slot design of the rotor slot 121c can make part of the molten aluminum flow out of the rotor slot 121, avoiding the occurrence of the ripple phenomenon of the rollback due to excessive surge fluctuation. Moreover, the open slot structural design of the rotor slot 121c can also reduce the leakage resistance, thereby reducing the starting current and improving the motor efficiency.

[0103] The rotor punching 120a is a round bottom groove, and the groove is an open groove. In combination with the "ratio between the width of the rotor groove 121c and the width of the rotor groove shoulder 121b is 0.20-0.25", it can be seen that the radial cross-sectional size 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 axial direction of the rotor part 120, the molten aluminum fills the middle part of the groove body (that is, the middle part of the rotor groove body 121a) and then tends 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 121c), which makes it easier to fill both sides of the rotor groove 121.

[0104] like Figure 5 and Figure 6 As shown, 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 slot 123 on the side wall of the rotor punching 120 a .

[0105] The inclined slot 123 is helpful to reduce the harmonic components of the motor and reduce the electromagnetic noise of the motor.

[0106] like Figure 6 As shown, the inclination rate of the skew groove 123 is 0.9-1.1; wherein, the inclination rate of 0.9-1.1 means: taking the first end face of the rotor punching 120a as a reference, a reference tooth is selected from a plurality of rotor teeth 124, the first end point 10 of the skew groove 123 starts from the reference tooth, and is inclined along the axial direction of the rotor member 120 to the intersection with the second end of the rotor punching 120a as the second end point 20 of the skew groove 123, and the skew groove 123 continues to extend from the second end point 20 to the end face of the second end; taking the axis N of the rotor member 120 as the inclination comparison reference, the first end point 10 and the second end point 20 of the skew groove 123 are offset by 0.9-1.1 rotor teeth 124. Figure 6 The middle dotted line M is a line connecting the first endpoint 10 and the second endpoint 20 .

[0107] 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.

[0108] Optionally, the inclination rate of the inclined groove 123 is 0.9, 1.0 or 1.1.

[0109] 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 reasonably designing the number of stator slots 111 and rotor slots 121, electromagnetic noise is reduced to a certain extent, and the motor efficiency is improved.

[0110] 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.

[0111] Exemplarily, the three-phase induction motor has a rated power of 870 W and a speed of 1900 rpm.

[0112] like Figure 1a and Figure 1b As shown, the induction motor further includes a rotating shaft 130 . The rotor punching sheet 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 .

[0113] like Figure 1a and Figure 1b As shown, the induction motor further includes a housing 140 mounted outside the stator component 110 , and the housing 140 has a protective effect on components such as the rotor component 120 and the stator component 110 .

[0114] 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 0.25-0.3mm. For example, the gap size formed in the radial direction between the stator component 110 and the rotor component 120 can be 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm or 0.3mm. 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, and achieve the high rated efficiency of the induction motor.

[0115] like Figure 7As shown, optionally, at least one slot 110b is provided on the outer wall of the stator component 110, and the slot 110b extends axially to each stator punching sheet 110a, and a connecting piece fixedly connected to each stator punching sheet 110a is provided in the slot 110b. The provision of the slot 110b is conducive to reducing the weight of the stator component 110. A plurality of stator punching sheets 110a are stacked together, and within a preset height, the number of stator punching sheets 110a is small (for example, less than the preset number of sheets), which will cause the adhesion of two adjacent stator punching sheets 110a to deteriorate. By adding a connecting piece, the connection between the stator punching sheets 110a can be strengthened, thereby ensuring the reliability of the connection.

[0116] 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 .

[0117] A plurality of stator sheets 110a are stacked together. Within a preset height, the fewer the stator sheets 110a are, the worse the adhesion between two adjacent stator sheets 110a is. More slots 110b also mean a greater number of connectors, thereby providing better reinforcement for the stator sheets 110a.

[0118] Optionally, the connecting member includes a welding rod, and the outer surface of the welding rod after welding with the stator component 110 is flush with the outer surface of the stator component 110 or is located in the slot body 110b.

[0119] Within the preset height, the number of stator laminations 110a is less than the preset number, and the reliability of 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.

[0120] Figure 8 The electromagnetic simulation results of the induction motor having the features of the above embodiment are shown as an example, and the induction motor efficiency MAP diagram (ignition control curve diagram) is drawn, wherein: Figure 8 The horizontal axis usually represents the motor speed of the induction motor (in rpm), and the vertical axis represents the motor load-torque of the induction motor (in Nm). Figure 8 It can be seen that 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%.

[0121] The features disclosed in the product embodiments provided by the present disclosure can be arbitrarily combined without conflict to obtain new product embodiments.

[0122] 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 may be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may 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, It is 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, It is 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, It is 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). Preferably, 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). Preferably, 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. Preferably, 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.

4. The induction motor according to claim 3, It is 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.

5. The induction motor according to claim 3, It is characterized in that The hollow volume of the rotor slot body (121a) gradually increases in a direction toward the stator component (110). Preferably, 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. Preferably, the hollow volume of the rotor slot (121c) gradually increases from the rotor slot shoulder (121b) toward the stator component (110).

6. The induction motor according to claim 3, It is 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). Preferably, 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).

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

7. Preferably, the number of the stator slots (111) is 36, and the number of the rotor slots (121) is 28.

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

9. The induction motor according to claim 1, It is 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. Preferably, a gap size formed between the stator component (110) and the rotor component (120) in the radial direction is 0.25-0.3 mm.

10. The induction motor according to claim 1, It is 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). Preferably, the stator component (110) has a preset height in the axial direction, the number of the slots (110b) is inversely proportional to the number of the stator sheets (110a), and the current of the induction motor is inversely proportional to the number of the stator sheets (110a). Preferably, 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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