Motor, compressor and refrigeration equipment

Abstract

The utility model discloses a motor, compressor and refrigeration equipment, the motor comprises a stator iron core, the diameter of the outer contour of a yoke part or the diameter of the inscribed circle of the outer contour of the yoke part is D1, the maximum distance between the radial inner end face of a tooth part and the axis of the stator iron core is D2 / 2, the maximum size of the tooth part is Ws in the direction perpendicular to the center line of the tooth part and the axial direction of the stator iron core; the maximum distance between the radial outer end faces of the rotor core and the two rotor units opposite to each other in the radial direction of the rotor core is D3, the minimum distance between the radial inner end faces of the rotor core is D4, and the maximum size of each rotor unit in the direction perpendicular to the center line of the rotor unit and the axial direction of the rotor core is Wr; and the radial length of the magnetic steel is Lpm, and the tangential length of the magnetic steel is Hpm, so that the motor can have relatively high slot fill factor and relatively high magnetic load, the output performance of the motor is remarkably improved, the overload capacity and demagnetization performance of the motor are improved, and the electromagnetic cost of the motor can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor, compressor and refrigeration equipment. Background Technology

[0002] In related technologies, traditional permanent magnet motors have a relatively small ratio of stator inner to outer diameter (split ratio), resulting in the motor being unable to provide a long torque arm and thus lower output performance. Simultaneously, traditional tangential permanent magnet motors have short tangential dimensions and long radial dimensions for their magnets. Due to rotor structure limitations, the amount of permanent magnets used is limited, leading to lower magnetic field energy density and ultimately lower efficiency. Furthermore, the short tangential dimension of the magnets cannot provide sufficient anti-demagnetizing magnetomotive force, easily causing demagnetization of the permanent magnets under high current, damaging both the permanent magnets and the motor's performance. Moreover, the short tangential and long radial magnets increase the radial and tangential lengths of the rotor lamination units, reducing material utilization and increasing manufacturing costs. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a motor with good output performance.

[0004] This utility model also proposes a compressor, which includes the aforementioned motor.

[0005] This utility model also proposes a refrigeration device, which includes the compressor described above.

[0006] The motor according to an embodiment of the present invention includes: a stator core, the stator core comprising a yoke and a plurality of teeth, the plurality of teeth being disposed on the inner peripheral wall of the yoke and spaced apart along the circumferential direction of the yoke; in the projection onto a plane perpendicular to the axis of the stator core, the diameter of the outer contour of the yoke or the diameter of the inscribed circle of the outer contour of the yoke is D1; ​​the maximum distance between the radial inner end face of the teeth and the axis of the stator core is D2 / 2; and the maximum dimension of the teeth is Ws in a direction perpendicular to the center line of the teeth and the axial direction of the stator core; and a rotor core, the rotor core being disposed radially inner to the stator core, the rotor core comprising a plurality of rotors arranged along the circumferential direction of the rotor core. A rotor unit is defined by defining a magnet slot between two adjacent rotor units. The maximum distance between the radially opposite outer end faces of two rotor units along the rotor core is D3, and the minimum distance between the radially opposite inner end faces of two rotor units along the rotor core is D4. The maximum dimension of the rotor unit is Wr in a direction perpendicular to the centerline of the rotor unit and the axial direction of the rotor core. Multiple magnets are disposed in multiple magnet slots. The radial length of each magnet is Lpm, and the tangential length is Hpm. The following conditions are met: D1, D2, D3, D4, Ws, Wr, Lpm, and Hpm.

[0007] According to the embodiments of the present invention, the motor is configured such that D1, D2, D3, D4, Ws, Wr, Lpm, and Hpm satisfy the following: This allows the motor to have a larger armature diameter while minimizing the radial length. Combined with the stator slot and magnet size design, it enables motors within this size range to have a higher slot fill factor and higher magnetic load, which can significantly improve the motor's output performance, overload capacity, and demagnetization performance. Furthermore, it can reduce the electromagnetic cost of the motor while meeting the same output performance requirements.

[0008] According to some embodiments of this utility model, D1, D2, D3, D4, Ws, Wr, Lpm, and Hpm satisfy the following:

[0009] According to some embodiments of this utility model, the number of magnets is N, and the tangential length HPm of the magnets and the maximum distance D3 between the radially opposite outer end faces of two rotor units along the rotor core satisfy the following: And / or, the radial length Lpm and the tangential length Hpm of the magnet satisfy:

[0010]

[0011] According to some embodiments of this utility model, the number of rotor units is N, and the effective simplified cross-sectional area of ​​the rotor unit is S1, where S1 = π / 4N × (D3) 2 -D4 2 The radial length of the magnet is Lpm, the tangential length of the magnet is Hpm, and the cross-sectional area of ​​the magnet is S2, where S2 = Hpm × Lpm. S2 and S1 satisfy the following:

[0012]

[0013] According to some embodiments of this utility model, the rotor unit includes a unit body and an inner magnetic bridge disposed at the radially inner end of the unit body. In a direction perpendicular to the centerline of the rotor unit and the axial direction of the rotor core, the minimum dimension of the radially inner end of the unit body is w1, the maximum dimension of the inner magnetic bridge is w2, and the maximum dimension of the rotor unit is Wr, and satisfies: And / or, the rotor unit includes a unit body and an inner magnetic bridge located at the radial inner end of the unit body. Along the centerline direction of the rotor unit, the size of the inner magnetic bridge is h0. The maximum distance between the radially opposite outer end faces of two rotor units along the rotor core is D3, and the minimum distance between the radially opposite inner end faces of two rotor units along the rotor core is D4, and the following conditions are met:

[0014] According to some embodiments of the present invention, multiple rotor units are spaced apart from each other; or, the rotor unit includes a unit body, an inner magnetic bridge disposed at the radially inner end of the unit body, and an outer magnetic bridge disposed at the radially outer end of the unit body, and two adjacent rotor units are connected through the inner magnetic bridge and / or the outer magnetic bridge along the circumferential direction of the rotor core; and / or, the motor further includes a rotor inner core, the rotor inner core being disposed on the radially inner side of the rotor core, and at least a portion of the rotor units are connected to the rotor inner core.

[0015] In some embodiments of this utility model, the rotor core includes a plurality of rotor laminations stacked along the axial direction of the rotor core. Each rotor lamination includes a plurality of sub-units arranged along the circumferential direction of the rotor lamination. Each sub-unit corresponds one-to-one with a plurality of rotor units. Each sub-unit has an inner magnetic bridge portion corresponding to the inner magnetic bridge and an outer magnetic bridge portion corresponding to the outer magnetic bridge. The motor also includes a rotor inner core. The rotor laminations include a first lamination and a second lamination. The plurality of sub-units of the first lamination are connected as a whole through at least one of the inner magnetic bridge portion, the outer magnetic bridge portion, and the rotor inner core. The plurality of sub-units of the second lamination are spaced apart from each other. The first laminations are located at both axial ends of the rotor core, and the axial middle region of the rotor core is formed by stacking at least one of the second laminations and the first laminations.

[0016] According to some embodiments of this utility model, the number of rotor units is N, and each rotor unit has a positioning hole penetrating the rotor unit along the axial direction of the rotor core. The cross-section of the positioning hole includes an arc-shaped portion and a rectangular portion. The arc of the arc-shaped portion is a superior arc. One long side of the rectangular portion is joined to the chord of the arc-shaped portion. The rectangular portion is located inside the arc-shaped portion along the radial direction of the rotor core. The diameter of the arc of the arc-shaped portion is Dz, the length of the rectangular portion is wz1, and the width of the rectangular portion is hz1, and the following conditions are met: And / or, the rotor unit has an injection hole penetrating the rotor unit along the axial direction of the rotor core. The cross-section of the injection hole is trapezoidal, and the injection hole has parallel long and short sides. Along the radial direction of the rotor core, the long side is located radially outside the short side and is longer than the length of the short side. The long side and the short side are perpendicular to the centerline of the rotor unit. The length of the long side is wz2, the length of the short side is wz3, and the height of the cross-section of the injection hole is hz2, satisfying:

[0017]

[0018] According to some embodiments of the present invention, the motor further includes: an inner rotor core, the inner rotor core being located radially inside the rotor core, the inner rotor core having a shaft hole, and a groove being provided on the outer peripheral wall of the inner rotor core, the groove being multiple, the multiple grooves being arranged at intervals along the circumferential direction of the inner rotor core, and the grooves penetrating the inner rotor core along the axial direction of the inner rotor core.

[0019] In some embodiments of this utility model, the maximum width of the groove is w4, the rotor unit includes a unit body and an inner magnetic bridge disposed at the radial inner end of the unit body, the maximum dimension of the inner magnetic bridge is w2 in the direction perpendicular to the center line of the rotor unit and the axial direction of the rotor core, and satisfies: 0.55≤w2 / w4≤0.8; and / or, in the cross-section perpendicular to the axial direction of the rotor inner core, the maximum distance between two adjacent grooves is w3, and the tangential length of the magnet is Hpm. And satisfy: 0.5≤w3 / Hpm≤0.65; and / or, the minimum distance between the outer peripheral wall of the rotor inner core and the magnet is h1, the minimum distance between the bottom wall of the groove and the radial inner end face of the rotor core is h2, the minimum distance between the outer peripheral wall of the rotor inner core and the axis of the rotor inner core is D5 / 2, the minimum distance between the inner peripheral wall of the rotor inner core and the axis of the rotor inner core is D6 / 2, and satisfy: 0.16≤2(h2-h1) / (D5-D6)≤0.32.

[0020] According to some embodiments of the present invention, the rotor unit includes a unit body, an inner magnetic bridge located at the radial inner end of the unit body, and an outer magnetic bridge located at the radial outer end of the unit body. A clearance groove is provided at the angle where the inner magnetic bridge and the unit body are connected, and / or, a clearance groove is provided at the angle where the outer magnetic bridge and the unit body are connected. The cross-section of the magnet is rectangular and at least the corner opposite to the clearance groove is a right angle.

[0021] According to some embodiments of the present invention, the yoke includes a plurality of sub-yokes arranged along the circumferential direction of the stator core. The plurality of sub-yokes correspond one-to-one with and are connected to the plurality of teeth. In the projection of a plane perpendicular to the axial direction of the stator core, the surface of the sub-yoke that is away from the teeth is a straight line perpendicular to the center line of the corresponding teeth.

[0022] In some embodiments of this utility model, in the projection of a plane perpendicular to the axial direction of the stator core, the surface of the sub-yoke near the tooth is a straight line perpendicular to the center line of the corresponding tooth.

[0023] The compressor according to an embodiment of the present invention includes the motor described above.

[0024] According to the compressor of this utility model embodiment, by setting the above-mentioned motor, D1, D2, D3, D4, Ws, Wr, Lpm, and Hpm satisfy the following: This allows the motor to have a larger armature diameter while minimizing the radial length. Combined with the stator slot and magnet size design, it enables motors within this size range to have a higher slot fill factor and higher magnetic load, which can significantly improve the motor's output performance, overload capacity, and demagnetization performance. Furthermore, it can reduce the electromagnetic cost of the motor while meeting the same output performance requirements.

[0025] The refrigeration equipment according to an embodiment of the present invention includes the compressor described above.

[0026] According to the refrigeration equipment of this utility model embodiment, by providing the above-mentioned compressor, including the above-mentioned motor, D1, D2, D3, D4, Ws, Wr, Lpm, and Hpm satisfy: This allows the motor to have a larger armature diameter while minimizing the radial length. Combined with the stator slot and magnet size design, it enables motors within this size range to have a higher slot fill factor and higher magnetic load, which can significantly improve the motor's output performance, overload capacity, and demagnetization performance. Furthermore, it can reduce the electromagnetic cost of the motor while meeting the same output performance requirements.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 This is a front view of the motor according to an embodiment of the present utility model;

[0030] Figure 2 This is a partial front view of the stator core of the motor according to an embodiment of the present utility model;

[0031] Figure 3 This is a front view of the rotor unit of the rotor core of the motor according to an embodiment of the present utility model;

[0032] Figure 4 This is a front view of the rotor unit and magnet of the rotor core of the motor according to an embodiment of the present utility model;

[0033] Figure 5 This is a front view of the rotor core of the motor according to an embodiment of the present utility model;

[0034] Figure 6 This is a front view of the rotor core of an electric motor according to another embodiment of the present invention;

[0035] Figure 7This is a front view of the rotor core of an electric motor according to another embodiment of the present invention;

[0036] Figure 8 This is a front view of a motor according to another embodiment of the present invention;

[0037] Figure 9 yes Figure 8 A magnified view of a section of the motor;

[0038] Figure 10 These are curves of K1 and back EMF per unit value of the motor according to embodiments of this utility model;

[0039] Figure 11 The curves showing K1 and efficiency of the motor according to embodiments of the present invention;

[0040] Figure 12 The curves of current and torque of the motor according to the embodiments of this utility model and the curves of the conventional solution are shown.

[0041] Figure 13 This is a comparison of the demagnetizing current of the motor according to an embodiment of the present invention with that of a conventional solution;

[0042] Figure 14 This is a comparison of the electromagnetic cost of the motor according to the embodiments of this utility model with that of the traditional solution;

[0043] Figure 15 This is a comparison of the line back electromotive force of the motor according to an embodiment of the present invention with that of a conventional solution.

[0044] Figure label:

[0045] 100. Electric motor;

[0046] 1. Stator core; 11. Yoke; 111. Sub-yoke; 12. Tooth; 13. Stator slot;

[0047] 2. Rotor core; 21. Rotor unit; 211. Unit body; 212. Inner magnetic bridge; 213. Outer magnetic bridge; 214. Magnet slot; 215. Positioning hole; 2151. Bow-shaped part; 2152. Rectangular part; 216. Injection hole; 217. Clearance groove;

[0048] 3. Magnets;

[0049] 4. Rotor inner core; 41. Groove; 42. Shaft hole. Detailed Implementation

[0050] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0051] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0052] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0053] The motor 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0054] like Figure 1 As shown, the motor 100 according to an embodiment of the present invention includes a stator core 1, a rotor core 2, and a magnet 3.

[0055] like Figure 1 As shown, the stator core 1 includes a yoke 11 and a plurality of teeth 12. The plurality of teeth 12 are disposed on the inner peripheral wall of the yoke 11 and are spaced apart along the circumferential direction of the yoke 11. A stator slot 13 is formed between two adjacent teeth 12. A winding can be wound on the teeth 12. The winding and the stator core 1 can form a stator assembly.

[0056] Along the circumferential direction of the stator core 1, the stator core 1 may include multiple stator units. Each stator unit includes a sub-yoke 111 and a tooth 12 as described above. The multiple sub-yokes 111 are connected end-to-end to form a ring-shaped yoke 11. The stator core 1 may be a single piece, with the multiple sub-yokes 111 of the multiple stator units connected end-to-end as a single piece, or multiple stator units may be connected as a single piece, with the sub-yokes 111 of the two stator units at both ends snapped together to form a ring.

[0057] Of course, this utility model is not limited to this. Multiple stator units can also be separate parts, with two adjacent stator units snapped together along the circumferential direction of the stator core 1.

[0058] exist Figure 1 In the example described, the stator core 1 is a single piece, with multiple stator units connected as a single strip. These stator units are then connected at both ends to form a ring around the stator core 1. Before bending, the stator units are straight strips, and a bending groove 14 is provided between the yoke portions 111 of adjacent stator units to facilitate bending. After the stator units are bent and connected to form a ring, the yoke portions 111 of the two stator units are joined at the bending groove 14.

[0059] like Figure 1 and Figure 2 As shown, in the projection on the plane perpendicular to the axis of the stator core 1, the diameter of the outer contour of the yoke 11 or the diameter of the inscribed circle of the outer contour of the yoke 11 is D1, the maximum distance between the radial inner end face of the tooth 12 and the axis of the stator core 1 is D2 / 2, and the maximum dimension of the tooth 12 is Ws in the direction perpendicular to the center line of the tooth 12 and the axial direction of the stator core 1.

[0060] like Figure 1 and Figure 3 As shown, the rotor core 2 is located radially inside the stator core 1 and is rotatable relative to the stator core 1. The rotor core 2 includes multiple rotor units 21 arranged along its circumferential direction. Magnet slots 214 are defined between adjacent rotor units 21, and multiple magnet slots 214 are defined between the multiple rotor units 21. Multiple magnets 3 are present, each disposed within one of the multiple magnet slots 214. It can be understood that the rotor core 2 and the magnets 3 can form a rotor assembly, and the number of magnets 3 is the same as the number of rotor units 21.

[0061] like Figure 1 , Figure 3 and Figure 4As shown, the maximum distance between the radially opposite outer end faces of two rotor units 21 along the rotor core 2 is D3, and the minimum distance between the radially opposite inner end faces of two rotor units 21 along the rotor core 2 is D4. In the direction perpendicular to the center line of the rotor unit 21 and the axial direction of the rotor core 2, the maximum dimension of the rotor unit 21 is Wr, the radial length of the magnet 3 is Lpm, and the tangential length of the magnet 3 is Hpm.

[0062] Among them, D1, D2, D3, D4, Ws, Wr, Lpm, and Hpm satisfy:

[0063]

[0064] It should be noted that in the above formulas, the units of D1, D2, D3, D4, Ws, Wr, Lpm and HPm are the same. For example, the units of D1, D2, D3, D4, Ws, Wr, Lpm and HPm can all be mm.

[0065] like Figure 10 and Figure 11 As shown, in When the back EMF is between 2.5 and 6.55, the per-unit value is relatively high, and the efficiency of motor 100 is relatively high. Specifically, motor 100 has a large armature diameter while minimizing radial length, and the stator slots 13 and magnets 3 are designed to meet the requirements of motor 100 within this size range, resulting in a high slot fill factor and high magnetic load, which can significantly improve the output performance of motor 100 (e.g., ...). Figure 12 As shown, the back EMF of the no-load line can be increased by about 25%, improving the motor's overload capacity and demagnetizing performance; under the same output performance requirements, such as Figure 11 As shown, the electromagnetic cost of motor 100 can be reduced by approximately 20%.

[0066] For example, K1 is It can be 3, 3.3, 3.5, 3.7, 4, 4.3, 4.5, 4.7, 5, 5.3, 5.5, 5.7, 6, 6.3 or 6.5, etc.

[0067] According to the embodiment of the present invention, the motor 100 is configured such that D1, D2, D3, D4, Ws, Wr, Lpm, and Hpm satisfy the following: This allows the motor 100 to have a large armature diameter with the shortest radial length. Combined with the size design of the stator slots 13 and magnets 3, the motor 100 within this size range has a high slot fill factor and a high magnetic load, which can significantly improve the output performance of the motor 100, improve the overload capacity and demagnetization performance of the motor 100, and reduce the electromagnetic cost of the motor 100 under the same output performance requirements.

[0068] In some embodiments of this utility model, in the projection onto a plane perpendicular to the axis of the stator core 1, the diameter of the outer contour of the yoke 11 or the diameter of the inscribed circle of the outer contour of the yoke 11 is D1; ​​the maximum distance between the radial inner end face of the tooth 12 and the axis of the stator core 1 is D2 / 2; the maximum dimension of the tooth 12 is Ws in the direction perpendicular to the centerline of the tooth 12 and the axial direction of the stator core 1; the maximum distance between the radial outer end faces of two rotor units 21 that are radially opposite to each other along the rotor core 2 is D3; the minimum distance between the radial inner end faces of two rotor units 21 that are radially opposite to each other along the rotor core 2 is D4; the maximum dimension of the rotor unit 21 is Wr in the direction perpendicular to the centerline of the rotor unit 21 and the axial direction of the rotor core 2; the radial length of the magnet 3 is Lpm; and the tangential length of the magnet 3 is Hpm. Wherein, D1, D2, D3, D4, Ws, Wr, Lpm, and Hpm satisfy:

[0069]

[0070] like Figure 10 and Figure 11 As shown, in When the back EMF is between 3.7 and 6.4, the per-unit value is relatively high, and the efficiency of motor 100 is relatively high. Specifically, motor 100 has a larger armature diameter while minimizing radial length, and the stator slots 13 and magnets 3 are designed to meet the requirements of motor 100 within this size range, resulting in a higher slot fill factor and higher magnetic load. This can better improve the output performance of motor 100, enhance its overload capacity and demagnetization performance, and reduce the electromagnetic cost of motor 100 while maintaining the same output performance requirements.

[0071] In some embodiments of this utility model, such as Figure 1 and Figure 4 As shown, the number of magnets 3 is N, and the tangential length Hpm of magnets 3 and the maximum distance D3 between the radially opposite outer end faces of two rotor units 21 along the rotor core 2 satisfy the following: It should be noted that in the above formula, D3 and Hpm have the same unit; for example, the unit of both D3 and Hpm can be mm.

[0072] When the number of magnets 3 is N, the tangential length Hpm of magnets 3, and the maximum distance D3 between the radially opposite outer end faces of two rotor units 21 along the rotor core 2 satisfy the following: This allows the motor 100 to have a larger armature diameter while minimizing its radial length, enabling the motor 100 within this size range to have a higher slot fill factor and higher magnetic load, thus improving the output performance of the motor 100, enhancing its overload capacity and demagnetizing properties, and reducing the electromagnetic cost of the motor 100 under the same output performance requirements.

[0073] For example, It can be 0.38, 0.4, 0.43, 0.45, 0.47, 0.5, 0.53 or 0.55, etc.

[0074] In some embodiments of this utility model, such as Figure 4 As shown, the radial length Lpm and the tangential length Hpm of magnet 3 satisfy: It should be noted that in the above relationship, Lpm and HPm have the same unit; for example, both Lpm and HPm can be in mm.

[0075] The radial length Lpm and the tangential length HPm of magnet 3 satisfy: This allows the motor 100 to have a larger armature diameter while minimizing its radial length, enabling the motor 100 within this size range to have a higher slot fill factor and higher magnetic load, thus improving the output performance of the motor 100, enhancing its overload capacity and demagnetizing properties, and reducing the electromagnetic cost of the motor 100 under the same output performance requirements.

[0076] For example, It can be 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3 or 2.4, etc.

[0077] In some embodiments of this utility model, the number of rotor units 21 is N, and the effective simplified cross-sectional area of ​​the rotor unit 21 is S1, where S1 = π / 4N × (D3) 2 -D4 2 The radial length of magnet 3 is Lpm, the tangential length of magnet 3 is Hpm, and the cross-sectional area of ​​magnet 3 is S2, where S2 = Hpm × Lpm. S2 and S1 satisfy: It should be noted that in the above formulas, D3, D4, Lpm and HPm have the same unit. For example, the unit of D3, D4, Lpm and HPm can all be mm.

[0078] When the effective simplified cross-sectional area S1 of rotor unit 21 and the cross-sectional area S2 of magnet 3 satisfy: This allows the motor 100 to have a larger armature diameter while minimizing its radial length, enabling the motor 100 within this size range to have a higher slot fill factor and higher magnetic load, thus improving the output performance of the motor 100, enhancing its overload capacity and demagnetizing properties, and reducing the electromagnetic cost of the motor 100 under the same output performance requirements.

[0079] For example, It can be 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05 or 1.1, etc.

[0080] In some embodiments of this utility model, such as Figure 1 and Figure 3 As shown, the rotor unit 21 includes a unit body 211 and an inner magnetic bridge 212 located at the radial inner end of the unit body 211. In the direction perpendicular to the center line of the rotor unit 21 and the axial direction of the rotor core 2, the minimum dimension of the radial inner end of the unit body 211 is w1, the maximum dimension of the inner magnetic bridge 212 is w2, and the maximum dimension of the rotor unit 21 is Wr, and satisfies: It should be noted that in the above formula, w1, w2 and Wr have the same unit. For example, the unit of w1, w2 and Wr can all be mm.

[0081] When the minimum radial inner dimension w1 of the unit body 211, the maximum dimension w2 of the inner magnetic bridge 212, and the maximum dimension Wr of the rotor unit 21 are perpendicular to the centerline of the rotor unit 21 and the axial direction of the rotor core 2, the following conditions must be met: This allows the motor 100 to have a larger armature diameter while minimizing its radial length, enabling the motor 100 within this size range to have a higher slot fill factor and higher magnetic load, thus improving the output performance of the motor 100, enhancing its overload capacity and demagnetizing properties, and reducing the electromagnetic cost of the motor 100 under the same output performance requirements.

[0082] For example, It can be 0.11, 0.12, 0.13, 0.14, or 0.15, etc.

[0083] In some embodiments of this utility model, such as Figure 1 and Figure 3As shown, the rotor unit 21 includes a unit body 211 and an inner magnetic bridge 212 located at the radial inner end of the unit body 211. Along the centerline of the rotor unit 21, the dimension of the inner magnetic bridge 212 is h0. The maximum distance between the radially opposite outer end faces of two rotor units 21 along the rotor core 2 is D3, and the minimum distance between the radially opposite inner end faces of two rotor units 21 along the rotor core 2 is D4, satisfying the following conditions: It should be noted that in the above formula, h0, D3 and D4 have the same unit. For example, the unit of h0, D3 and D4 can all be mm.

[0084] When the dimension h0 of the inner magnetic bridge 212 along the centerline direction of the rotor unit 21, the maximum distance D3 between the radially opposite outer end faces of the two rotor units 21 along the rotor core 2, and the minimum distance D4 between the radially opposite inner end faces of the two rotor units 21 along the rotor core 2 satisfy the following: This allows the motor 100 to have a larger armature diameter while minimizing its radial length, enabling the motor 100 within this size range to have a higher slot fill factor and higher magnetic load, thus improving the output performance of the motor 100, enhancing its overload capacity and demagnetizing properties, and reducing the electromagnetic cost of the motor 100 under the same output performance requirements.

[0085] For example, It can be 0.023, 0.025, 0.027, 0.029, 0.03, 0.033, 0.035, 0.037, 0.039, 0.04, or 0.042, etc.

[0086] In some embodiments of this utility model, such as Figure 1 As shown, multiple rotor units 21 are spaced apart from each other and operate independently. This optimizes the magnetic field distribution and performance of the motor 100, improves the heat dissipation efficiency of the motor 100, reduces mechanical stress and vibration, simplifies manufacturing and assembly processes, and enhances the stability and reliability of the structure.

[0087] In some embodiments of this utility model, the rotor unit 21 includes a unit body 211, an inner magnetic bridge 212 located at the radially inner end of the unit body 211, and an outer magnetic bridge 213 located at the radially outer end of the unit body 211. Along the circumferential direction of the rotor core 2, two adjacent rotor units 21 are connected by the inner magnetic bridge 212 and / or the outer magnetic bridge 213. It can be understood that two adjacent rotor units 21 can be connected by the inner magnetic bridge 212, or two adjacent rotor units 21 can be connected by the outer magnetic bridge 213, or two adjacent rotor units 21 can be connected by both the inner magnetic bridge 212 and the outer magnetic bridge 213.

[0088] This allows multiple rotor units 21 to be connected together. The inner magnetic bridge 212 and outer magnetic bridge 213, through the limiting magnet 3, reduce magnetic leakage and improve the utilization rate of the magnet 3, thereby improving the efficiency of the motor 100. The design of the inner magnetic bridge 212 and outer magnetic bridge 213 helps to precisely control the magnetic field and improve the overall performance of the motor 100. As a connection structure between rotor units 21, the inner magnetic bridge 212 and outer magnetic bridge 213 can enhance the overall mechanical strength of the rotor core 2. Through the limiting effect of the inner magnetic bridge 212 and outer magnetic bridge 213, the magnet 3 is positioned within the rotor unit 21. The inner magnetic bridge 212 and outer magnetic bridge 213 are firmly fixed to each other to prevent them from falling off during high-speed operation, ensuring the safety and reliability of the motor 100. The inner magnetic bridge 212 and outer magnetic bridge 213 reduce the leakage magnetic flux of the magnet 3 by limiting the path of leakage magnetic flux. The design of the inner magnetic bridge 212 and outer magnetic bridge 213 helps to optimize the magnetic circuit structure, reduce magnetic resistance, and improve the utilization efficiency of the magnetic field. By reducing leakage magnetic flux and optimizing the magnetic circuit design, the design of the inner magnetic bridge 212 and outer magnetic bridge 213 helps to reduce the energy loss of the motor 100, lower the operating temperature of the motor 100, and thus extend the service life of the motor 100.

[0089] For example, in Figure 5 In the example shown, any two adjacent rotor units 21 of the plurality of rotor units 21 are connected by an inner magnetic bridge 212. Figure 6 In the example shown, any two adjacent rotor units 21 are connected by an outer magnetic bridge 213. It should be noted that when two adjacent rotor units 21 are connected by an inner magnetic bridge 212 and an outer magnetic bridge 213, the division of the rotor unit 21 can be the midpoint of the connected inner magnetic bridge 212 or the midpoint of the connected outer magnetic bridge 213.

[0090] In some embodiments of this utility model, such as Figure 7 As shown, the motor 100 also includes an inner rotor core 4, which is located radially inside the rotor core 2, and at least some of the rotor units 21 are connected to the inner rotor core 4. It can be understood that some of the multiple rotor units 21 may be connected to the inner rotor core 4, or all of the rotor units 21 may be connected to the inner rotor core 4.

[0091] In the high-speed motor 100, the rotor core 2 bears enormous centrifugal force. The inner rotor core 4, as a radial support structure, can significantly improve the deformation resistance of the rotor core 2, preventing it from cracking or becoming unstable due to centrifugal force. The connection between the inner rotor core 4 and the rotor unit 21 enhances the overall rigidity of the rotor, reduces vibration and noise, and improves the smoothness of motor 100 operation. The inner rotor core 4 can be integrated with the rotor core 2, simplifying the manufacturing process and reducing production costs. The inner rotor core 4 provides precise positioning and support for the rotor unit 21, improving assembly accuracy and ensuring the consistency of motor 100 performance.

[0092] In some embodiments of this utility model, the rotor core 2 includes a plurality of rotor laminations stacked along the axial direction of the rotor core 2. The rotor laminations include a plurality of sub-units arranged along the circumferential direction of the rotor laminations. The plurality of sub-units correspond one-to-one with the plurality of rotor units 21. The sub-units have an inner magnetic bridge portion corresponding to the inner magnetic bridge 212 and an outer magnetic bridge portion corresponding to the outer magnetic bridge 213. The motor 100 also includes a rotor inner core 4. The rotor laminations include a first lamination and a second lamination. The plurality of sub-units of the first lamination are connected as a whole by at least one of the inner magnetic bridge portion, the outer magnetic bridge portion, and the rotor inner core 4. The plurality of sub-units of the second lamination are spaced apart from each other. The first laminations are at both ends of the rotor core 2 in the axial direction. The axial middle region of the rotor core 2 is formed by stacking at least one of the second laminations and the first laminations.

[0093] It is understandable that, along the axial direction of the rotor core 2, some rotor laminations at both ends of the rotor core 2 are first laminations, and the rotor laminations in the middle region of the rotor core 2 are all first laminations, all second laminations, or a combination of first and second laminations. When the middle region of the rotor core 2 along the axial direction contains multiple first laminations and multiple second laminations, these multiple first laminations and multiple second laminations can be stacked alternately.

[0094] This facilitates the connection of multiple rotor laminations into a single rotor core 2.

[0095] For example, in Figure 7 In the example shown, some rotor units 21 of the multiple rotor units 21 are connected to the rotor inner core 4, and some rotor units 21 are spaced apart from the rotor inner core 4. The rotor units 21 connected to the rotor inner core 4 and the rotor units 21 not connected to the rotor inner core 4 are arranged alternately along the circumferential direction of the rotor core 2.

[0096] In some embodiments of this utility model, such as Figure 1 and Figure 3 As shown, the rotor unit 21 has a positioning hole 215 and an injection hole 216 that penetrate the rotor unit 21 along the axial direction of the rotor core 2. The injection hole 216 is located radially inside the positioning hole 215. The positioning hole 215 and the injection hole 216 are used to connect multiple rotor units 21. The positioning hole 215 is a non-circular hole. When connecting multiple rotor units 21, the multiple rotor units 21 are first positioned through the positioning hole 215. The positioning hole 215 can cooperate with the positioning post on the external device. After inserting the magnet 3 between each two adjacent rotor units 21, the molding material is injected into each injection hole 216. The multiple rotor units 21 are connected together to form a rotor assembly through the injection material.

[0097] like Figure 3As shown, the number of rotor units 21 is N. The cross-section of the positioning hole 215 includes an arc-shaped portion 2151 and a rectangular portion 2152. The arc of the arc-shaped portion 2151 is a superior arc. One long side of the rectangular portion 2152 is joined to the chord of the arc-shaped portion 2151. The rectangular portion 2152 is located inside the arc-shaped portion 2151 along the radial direction of the rotor core 2. The diameter of the arc of the arc-shaped portion 2151 is Dz, the length of the rectangular portion 2152 is wz1, and the width of the rectangular portion 2152 is hz1, and the following conditions are met: It should be noted that in the above formula, the units of Dz, wz1, hz1, D3 and D4 are the same. For example, the units of Dz, wz1, hz1, D3 and D4 can all be mm.

[0098] When the diameter Dz of the arc of the arc-shaped part 2151, the length wz1 of the rectangular part 2152, the width hz1 of the rectangular part 2152, the maximum distance D3 between the radially opposite outer end faces of two rotor units 21 along the rotor core 2, and the minimum distance D4 between the radially opposite inner end faces of two rotor units 21 along the rotor core 2 satisfy the following conditions: This can enhance the positioning effect of rotor unit 21 during the machining and assembly of the rotor assembly. For example, It can be 0.04, 0.045, 0.05, 0.055, 0.06, 0.065, 0.07, 0.075, 0.08, 0.085, 0.09, 0.095, 0.1 or 0.11, etc.

[0099] like Figure 3 As shown, the number of rotor units 21 is N. The cross-section of the injection hole 216 is trapezoidal. The injection hole 216 has a long side and a short side. Along the radial direction of the rotor core 2, the long side is located radially outside the short side and is longer than the short side. The long side and the short side are perpendicular to the center line of the rotor unit 21. The length of the long side is wz2, the length of the short side is wz3, and the height of the cross-section of the injection hole 216 is hz2, and it satisfies: It should be noted that in the above formulas, wz2, wz3, hz2, D3 and D4 have the same unit. For example, the unit of wz2, wz3, hz2, D3 and D4 can all be mm.

[0100] When the length of the long side wz2, the length of the short side wz3, the height of the cross section of the injection hole 216 hz2, the maximum distance D3 between the radially opposite outer end faces of two rotor units 21 along the rotor core 2, and the minimum distance D4 between the radially opposite inner end faces of two rotor units 21 along the rotor core 2 satisfy the following: This can improve the reliability of the connection between multiple rotor units 21. For example, It can be 0.03, 0.033, 0.035, 0.038, 0.04, 0.043, 0.045, 0.048, 0.05, 0.053, 0.055, 0.058, 0.06, 0.063, 0.065, 0.068, or 0.07, etc.

[0101] In some embodiments of this utility model, such as Figure 8 and Figure 9 As shown, the motor 100 also includes an inner rotor core 4, which is located radially inside the rotor core 2. The inner rotor core 4 has a shaft hole 42, and its outer peripheral wall has multiple grooves 41. These grooves 41 are spaced apart along the circumferential direction of the inner rotor core 4 and penetrate the inner rotor core 4 along its axial direction. The inner rotor core 4 and the rotor core 2 can be injection molded together. The multiple grooves 41 on the outer peripheral wall of the inner rotor core 4 increase the bonding force between the injection molding material and the inner rotor core 4, thereby improving the reliability of the connection between the rotor core 2 and the inner rotor core 4.

[0102] Optionally, such as Figure 9 As shown, along the depth direction of the groove 41 and in the direction from the bottom wall of the groove 41 to the opening, the width of at least part of the groove 41 gradually decreases, thereby increasing the bonding force between the groove 41 and the injection molding material located in the groove 41, and preventing the injection molding material from separating from the rotor core 4.

[0103] In some embodiments of this utility model, such as Figure 3 and Figure 9 As shown, the maximum width of the groove 41 is w4. The rotor unit 21 includes a unit body 211 and an inner magnetic bridge 212 located at the radial inner end of the unit body 211. In the direction perpendicular to the center line of the rotor unit 21 and the axial direction of the rotor core 2, the maximum dimension of the inner magnetic bridge 212 is w2, and satisfies: 0.55≤w2 / w4≤0.8. It should be noted that in the above relationship, w4 and w2 have the same unit; for example, the unit of w4 and w2 can both be mm.

[0104] When the maximum width w4 of the groove 41, in the direction perpendicular to the center line of the rotor unit 21 and the axial direction of the rotor core 2, and the maximum dimension w2 of the inner magnetic bridge 212 satisfies 0.55≤w2 / w4≤0.8, the bonding force between the injection molding material and the rotor inner core 4 can be improved, thus enhancing the reliability of the connection between the rotor core 2 and the rotor inner core 4. For example, w2 / w4 can be 0.57, 0.59, 0.6, 0.63, 0.65, 0.67, 0.69, 0.7, 0.73, 0.75, 0.77, 0.79, or 0.8, etc.

[0105] In some embodiments of this utility model, such as Figure 4 and Figure 9 As shown, on a cross-section perpendicular to the axial direction of the rotor's inner core 4, the maximum distance between two adjacent grooves 41 is w3, and the tangential length of the magnet 3 is Hpm, satisfying: 0.5 ≤ w3 / Hpm ≤ 0.65. It should be noted that in the above formula, w3 and Hpm have the same unit; for example, both w3 and Hpm can be in mm.

[0106] When the maximum distance w3 between two adjacent grooves 41 and the tangential length Hpm of the magnet 3 satisfy 0.5 ≤ w3 / Hpm ≤ 0.65, the bonding force between the injection molding material and the rotor inner core 4 can be improved, thus enhancing the reliability of the connection between the rotor core 2 and the rotor inner core 4. For example, w3 / Hpm can be 0.52, 0.55, 0.57, 0.59, 0.6, 0.63, or 0.65, etc.

[0107] In some embodiments of this utility model, the minimum distance between the outer peripheral wall of the rotor inner core 4 and the magnet 3 is h1, the minimum distance between the bottom wall of the groove 41 and the radial inner end face of the rotor core 2 is h2, the minimum distance between the outer peripheral wall of the rotor inner core 4 and the axis of the rotor inner core 4 is D5 / 2, and the minimum distance between the inner peripheral wall of the rotor inner core 4 and the axis of the rotor inner core 4 is D6 / 2, and satisfies: 0.16≤2(h2-h1) / (D5-D6)≤0.32.

[0108] It should be noted that in the above formula, h1, h2, D5 and D6 have the same unit. For example, the unit of h1, h2, D5 and D6 can all be mm.

[0109] When the minimum distance h1 between the outer peripheral wall of the rotor inner core 4 and the magnet 3, the minimum distance h2 between the bottom wall of the groove 41 and the radial inner end face of the rotor core 2, twice the minimum distance D5 between the outer peripheral wall of the rotor inner core 4 and the axis of the rotor inner core 4, and twice the minimum distance D6 between the inner peripheral wall of the rotor inner core 4 and the axis of the rotor inner core 4 satisfy 0.16≤2(h2-h1) / (D5-D6)≤0.32, the bonding force between the injection molding material and the rotor inner core 4 can be improved, and the reliability of the connection between the rotor core 2 and the rotor inner core 4 can be improved. For example, 2(h2-h1) / (D5-D6) can be 0.17, 0.19, 0.20, 0.22, 0.25, 0.27, 0.29, 0.30, or 0.32, etc.

[0110] In some embodiments of this utility model, such as Figure 3 , Figure 4 and Figure 9As shown, the rotor unit 21 includes a unit body 211, an inner magnetic bridge 212 located at the radial inner end of the unit body 211, and an outer magnetic bridge 213 located at the radial outer end of the unit body 211. A clearance groove 217 is provided at the angle where the inner magnetic bridge 212 and the unit body 211 are connected, and / or, a clearance groove 217 is provided at the angle where the outer magnetic bridge 213 and the unit body 211 are connected. The cross-section of the magnet 3 is rectangular and at least the corner opposite to the clearance groove 217 is a right angle.

[0111] It is understood that the clearance groove 217 may be provided only at the angle where the inner magnetic bridge 212 and the unit body 211 are connected, or the clearance groove 217 may be provided only at the angle where the outer magnetic bridge 213 and the unit body 211 are connected, or the clearance groove 217 may be provided at the angle where the inner magnetic bridge 212 and the unit body 211 are connected, and the clearance groove 217 may also be provided at the angle where the outer magnetic bridge 213 and the unit body 211 are connected, wherein the clearance groove 217 extends along the axial direction of the rotor core 2.

[0112] For example, in Figure 3 , Figure 4 and Figure 9 In the example shown, a clearance groove 217 is provided at the angle where the inner magnetic bridge 212 and the unit body 211 are connected, and a clearance groove 217 is also provided at the angle where the outer magnetic bridge 213 and the unit body 211 are connected. The cross-section of the magnet 3 is rectangular and all four corners are right angles.

[0113] By providing a clearance groove 217 at the angle where the inner magnetic bridge 212 and the unit body 211 connect, and / or providing a clearance groove 217 at the angle where the outer magnetic bridge 213 and the unit body 211 connect, the corners of the magnet 3 opposite to the clearance groove 217 can be set as right angles without chamfering. This improves the demagnetization resistance of the magnet 3 at the corners opposite to the clearance groove 217, reduces local demagnetization of the magnet 3, and to a certain extent enhances the demagnetization resistance of the motor 100, thereby increasing the demagnetization current of the motor 100. Furthermore, increasing the amount of magnet 3 at the corners opposite to the clearance groove 217 can improve the output capacity and efficiency of the motor 100, and can reduce the width of the magnetic bridges at the inner magnetic bridge 212 and the outer magnetic bridge 213, reducing magnetic leakage. Additionally, since the corners of the magnet 3 opposite to the clearance groove 217 are right angles, the chamfering process of the magnet 3 can be omitted, facilitating the processing and dimensional control of the magnet 3.

[0114] In some embodiments of this utility model, such as Figure 1 and Figure 2As shown, the yoke 11 includes multiple sub-yokes 111 arranged along the circumferential direction of the stator core 1. Each sub-yoke 111 corresponds to and is connected to a plurality of teeth 12. In the projection of a plane perpendicular to the axial direction of the stator core 1, the surface of the sub-yoke 111 facing away from the teeth 12 is a straight line perpendicular to the centerline of the corresponding tooth 12. This design offers significant advantages in terms of manufacturability, heat dissipation, electromagnetic performance, structural strength, and design flexibility. This design not only reduces manufacturing costs but also improves the overall performance and reliability of the motor 100, making it an efficient and practical solution in the design of the motor 100.

[0115] Furthermore, such as Figure 1 and Figure 2 As shown, in the projection of a plane perpendicular to the axial direction of the stator core 1, the surface of the sub-yoke 111 near the tooth 12 is a straight line perpendicular to the center line of the corresponding tooth 12. This allows for better reduction of manufacturing costs and improves the overall performance and reliability of the motor 100.

[0116] The following is for reference. Figures 1-9 The present invention describes a motor 100 according to some embodiments thereof.

[0117] In some embodiments of this utility model, such as Figures 1-4 As shown, the motor 100 includes a stator core 1, a rotor core 2, and a magnet 3.

[0118] like Figure 1 As shown, the stator core 1 includes a yoke 11 and a plurality of teeth 12. The plurality of teeth 12 are disposed on the inner peripheral wall of the yoke 11 and are spaced apart along the circumferential direction of the yoke 11. A stator slot 13 is formed between two adjacent teeth 12. In the projection on the plane perpendicular to the axis of the stator core 1, the diameter of the outer contour of the yoke 11 or the diameter of the inscribed circle of the outer contour of the yoke 11 is D1. The maximum distance between the radial inner end face of the tooth 12 and the axis of the stator core 1 is D2 / 2. In the direction perpendicular to the center line of the tooth 12 and the axial direction of the stator core 1, the maximum dimension of the tooth 12 is Ws.

[0119] like Figure 1 As shown, the rotor core 2 is located radially inside the stator core 1 and is rotatable relative to the stator core 1. The rotor core 2 includes multiple rotor units 21 arranged along the circumferential direction of the rotor core 2. A magnet slot 214 is defined between two adjacent rotor units 21, and multiple magnet slots 214 are defined between multiple rotor units 21. There are multiple magnets 3, and the multiple magnets 3 are respectively disposed in the multiple magnet slots 214.

[0120] The maximum distance between the radially opposite outer end faces of two rotor units 21 along the rotor core 2 is D3, and the minimum distance between the radially opposite inner end faces of two rotor units 21 along the rotor core 2 is D4. In the direction perpendicular to the center line of the rotor unit 21 and the axial direction of the rotor core 2, the maximum dimension of the rotor unit 21 is Wr, the radial length of the magnet 3 is Lpm, and the tangential length of the magnet 3 is Hpm.

[0121] Among them, D1, D2, D3, D4, Ws, Wr, Lpm, and Hpm satisfy:

[0122]

[0123] For example, K1 is It can be 3.7, 4, 4.3, 4.5, 4.7, 5, 5.3, 5.5, 5.7, 6, 6.3, etc.

[0124] like Figure 1 and Figure 4 As shown, the number of magnets 3 is N, and the tangential length Hpm of magnets 3 and the maximum distance D3 between the radially opposite outer end faces of two rotor units 21 along the rotor core 2 satisfy the following: The radial length Lpm and the tangential length HPm of magnet 3 satisfy: For example, It can be 0.38, 0.4, 0.43, 0.45, 0.47, 0.5, 0.53 or 0.55, etc. It can be 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3 or 2.4, etc.

[0125] The effective simplified cross-sectional area of ​​rotor unit 21 is S1, S1=π / 4N×(D3) 2 -D4 2 The cross-sectional area of ​​magnet 3 is S2, where S2 = Hpm × Lpm, and S2 and S1 satisfy: It can be 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05 or 1.1, etc.

[0126] like Figure 1 and Figure 3 As shown, the rotor unit 21 includes a unit body 211 and an inner magnetic bridge 212 located at the radial inner end of the unit body 211. In the direction perpendicular to the center line of the rotor unit 21 and the axial direction of the rotor core 2, the minimum dimension of the radial inner end of the unit body 211 is w1, the maximum dimension of the inner magnetic bridge 212 is w2, and the maximum dimension of the rotor unit 21 is Wr, and satisfies: It can be 0.11, 0.12, 0.13, 0.14, or 0.15, etc.

[0127] Along the centerline of rotor unit 21, the size of the inner magnetic bridge 212 is h0, the maximum distance between the radially opposite outer end faces of two rotor units 21 along the rotor core 2 is D3, and the minimum distance between the radially opposite inner end faces of two rotor units 21 along the rotor core 2 is D4, and the following conditions are met: It can be 0.023, 0.025, 0.027, 0.029, 0.03, 0.033, 0.035, 0.037, 0.039, 0.04, or 0.042, etc.

[0128] like Figure 1 As shown, multiple rotor units 21 are spaced apart from each other and operate independently. This optimizes the magnetic field distribution and performance of the motor 100, improves the heat dissipation efficiency of the motor 100, reduces mechanical stress and vibration, simplifies manufacturing and assembly processes, and enhances the stability and reliability of the structure.

[0129] like Figure 1 and Figure 3 As shown, the rotor unit 21 has a positioning hole 215 and an injection hole 216 that penetrate the rotor unit 21 along the axial direction of the rotor core 2. The injection hole 216 is located radially inside the positioning hole 215. The positioning hole 215 and the injection hole 216 are used to connect multiple rotor units 21. The positioning hole 215 is a non-circular hole. When connecting multiple rotor units 21, the multiple rotor units 21 are first positioned through the positioning hole 215. The positioning hole 215 can cooperate with the positioning post on the external device. After inserting the magnet 3 between each two adjacent rotor units 21, the molding material is injected into each injection hole 216. The multiple rotor units 21 are connected together to form a rotor assembly through the injection material.

[0130] like Figure 3 As shown, the number of rotor units 21 is N. The cross-section of the positioning hole 215 includes an arc-shaped portion 2151 and a rectangular portion 2152. The arc of the arc-shaped portion 2151 is a superior arc. One long side of the rectangular portion 2152 is joined to the chord of the arc-shaped portion 2151. The rectangular portion 2152 is located inside the arc-shaped portion 2151 along the radial direction of the rotor core 2. The diameter of the arc of the arc-shaped portion 2151 is Dz, the length of the rectangular portion 2152 is wz1, and the width of the rectangular portion 2152 is hz1, and the following conditions are met: It can be 0.04, 0.045, 0.05, 0.055, 0.06, 0.065, 0.07, 0.075, 0.08, 0.085, 0.09, 0.095, 0.1 or 0.11, etc.

[0131] The cross-section of injection hole 216 is trapezoidal, with a long side and a short side. Along the radial direction of rotor core 2, the long side is located radially outside the short side and is longer than the short side. The long and short sides are perpendicular to the centerline of rotor unit 21. The length of the long side is wz2, the length of the short side is wz3, and the height of the cross-section of injection hole 216 is hz2, satisfying the following: For example, It can be 0.03, 0.033, 0.035, 0.038, 0.04, 0.043, 0.045, 0.048, 0.05, 0.053, 0.055, 0.058, 0.06, 0.063, 0.065, 0.068, or 0.07, etc.

[0132] like Figure 3 , Figure 4 As shown, the rotor unit 21 includes a unit body 211, an inner magnetic bridge 212 located at the radial inner end of the unit body 211, and an outer magnetic bridge 213 located at the radial outer end of the unit body 211. A clearance groove 217 is provided at the angle where the inner magnetic bridge 212 and the unit body 211 are connected, and / or, a clearance groove 217 is provided at the angle where the outer magnetic bridge 213 and the unit body 211 are connected. The cross-section of the magnet 3 is rectangular and at least the corner opposite to the clearance groove 217 is a right angle.

[0133] like Figure 1 and Figure 2 As shown, the yoke 11 includes multiple sub-yokes 111 arranged along the circumferential direction of the stator core 1. Each sub-yoke 111 corresponds to and is connected to a plurality of teeth 12. In the projection onto a plane perpendicular to the axial direction of the stator core 1, the surface of the sub-yoke 111 facing away from the teeth 12 is a straight line perpendicular to the centerline of the corresponding tooth 12, and the surface of the sub-yoke 111 approaching the teeth 12 is also a straight line perpendicular to the centerline of the corresponding tooth 12. This design offers significant advantages in terms of manufacturability, heat dissipation, electromagnetic performance, structural strength, and design flexibility. This design not only reduces manufacturing costs but also improves the overall performance and reliability of the motor 100, making it an efficient and practical solution for motor 100 design.

[0134] In other embodiments of this utility model, the difference from the above embodiments is as follows: Figure 5 As shown, the rotor unit 21 includes a unit body 211, an inner magnetic bridge 212 located at the inner radial end of the unit body 211, and an outer magnetic bridge 213 located at the outer radial end of the unit body 211. Along the circumferential direction of the rotor core 2, any two adjacent rotor units 21 are connected by the inner magnetic bridge 212.

[0135] In other embodiments of this utility model, the difference from the above embodiments is as follows: Figure 6As shown, the rotor unit 21 includes a unit body 211, an inner magnetic bridge 212 located at the radial inner end of the unit body 211, and an outer magnetic bridge 213 located at the radial outer end of the unit body 211. Along the circumferential direction of the rotor core 2, any two adjacent rotor units 21 are connected by the outer magnetic bridge 213.

[0136] In other embodiments of this utility model, the difference from the above embodiments is as follows: Figure 7 As shown, the motor 100 also includes a rotor inner core 4, which is located radially inside the rotor core 2, and at least a portion of the rotor unit 21 is connected to the rotor inner core 4.

[0137] In other embodiments of this utility model, such as Figure 8 and Figure 9 As shown, the motor 100 also includes an inner rotor core 4, which is located radially inside the rotor core 2. The inner rotor core 4 has a shaft hole 42, and its outer peripheral wall has multiple grooves 41. These grooves 41 are spaced apart along the circumferential direction of the inner rotor core 4 and penetrate the inner rotor core 4 along its axial direction. The inner rotor core 4 and the rotor core 2 can be injection molded together. The multiple grooves 41 on the outer peripheral wall of the inner rotor core 4 increase the bonding force between the injection molding material and the inner rotor core 4, thereby improving the reliability of the connection between the rotor core 2 and the inner rotor core 4.

[0138] like Figure 3 , Figure 4 and Figure 9 As shown, the maximum width of the groove 41 is w4. The rotor unit 21 includes a unit body 211 and an inner magnetic bridge 212 located at the radial inner end of the unit body 211. In the direction perpendicular to the center line of the rotor unit 21 and the axial direction of the rotor core 2, the maximum dimension of the inner magnetic bridge 212 is w2, and satisfies: 0.55≤w2 / w4≤0.8. In the cross-section perpendicular to the axial direction of the rotor inner core 4, the maximum distance between two adjacent grooves 41 is w3, and the tangential length of the magnet 3 is Hpm, and satisfies: 0.5≤w3 / Hpm≤0.65. The minimum distance between the outer peripheral wall of the rotor inner core 4 and the magnet 3 is h1, the minimum distance between the bottom wall of the groove 41 and the radial inner end face of the rotor core 2 is h2, the minimum distance between the outer peripheral wall of the rotor inner core 4 and the axis of the rotor inner core 4 is D5 / 2, and the minimum distance between the inner peripheral wall of the rotor inner core 4 and the axis of the rotor inner core 4 is D6 / 2, and satisfies: 0.16≤2(h2-h1) / (D5-D6)≤0.32.

[0139] For example, w2 / w4 can be 0.57, 0.59, 0.6, 0.63, 0.65, 0.67, 0.69, 0.7, 0.73, 0.75, 0.77, 0.79, or 0.8, etc. For example, w3 / Hpm can be 0.52, 0.55, 0.57, 0.59, 0.6, 0.63, or 0.65, etc. For example, 2(h2-h1) / (D5-D6) can be 0.17, 0.19, 0.20, 0.22, 0.25, 0.27, 0.29, 0.30, or 0.32, etc.

[0140] In some other embodiments of this utility model, the rotor core 2 includes a plurality of rotor laminations stacked along the axial direction of the rotor core 2. The rotor laminations include a plurality of sub-units arranged along the circumferential direction of the rotor laminations. The plurality of sub-units correspond one-to-one with the plurality of rotor units 21. The sub-units have an inner magnetic bridge portion corresponding to the inner magnetic bridge 212 and an outer magnetic bridge portion corresponding to the outer magnetic bridge 213. The motor 100 also includes a rotor inner core 4. The rotor laminations include a first lamination and a second lamination. The plurality of sub-units of the first lamination are connected as a whole by at least one of the inner magnetic bridge portion, the outer magnetic bridge portion, and the rotor inner core 4. The plurality of sub-units of the second lamination are spaced apart from each other. The first laminations are at both ends of the rotor core 2 in the axial direction. The axial middle region of the rotor core 2 is formed by stacking at least one of the second laminations and the first laminations.

[0141] In this application, as Figure 10 and Figure 11 As shown, by making When the back EMF is between 3.7 and 6.4, the per-unit value is relatively high, and the motor efficiency is relatively high.

[0142] Additionally, refer to Figure 12 As shown, the solution of this application can increase the output torque of motor 100 compared to the traditional solution under the same current. (Refer to...) Figure 13 The solution proposed in this application increases the demagnetizing current compared to traditional solutions; see reference. Figure 14 The solution presented in this application has lower electromagnetic costs compared to traditional solutions; see reference. Figure 15 The proposed solution improves the back electromotive force compared to traditional solutions.

[0143] The motor 100 of this solution can have a large armature diameter with the shortest radial length. With the stator slot 13 and magnet 3 size design, the motor 100 that satisfies the above relationship has a high slot fill factor and a high magnetic load, which can significantly improve the output performance of the motor 100, improve the overload capacity and demagnetization performance of the motor 100, and reduce the electromagnetic cost of the motor 100 under the same output performance requirements.

[0144] The compressor according to an embodiment of the present invention is described below.

[0145] The compressor according to an embodiment of the present invention includes the motor 100 described above.

[0146] According to the compressor of this utility model embodiment, by setting the motor 100 described above, D1, D2, D3, D4, Ws, Wr, Lpm, and Hpm satisfy the following: This allows the motor 100 to have a large armature diameter with the shortest radial length. Combined with the size design of the stator slots 13 and magnets 3, the motor 100 within this size range has a high slot fill factor and a high magnetic load, which can significantly improve the output performance of the motor 100, improve the overload capacity and demagnetization performance of the motor 100, and reduce the electromagnetic cost of the motor 100 under the same output performance requirements.

[0147] The following describes a refrigeration device according to an embodiment of the present invention.

[0148] The refrigeration equipment according to an embodiment of the present invention includes the compressor described above.

[0149] According to the refrigeration equipment of this utility model embodiment, by providing the above-mentioned compressor, including the above-mentioned motor 100, D1, D2, D3, D4, Ws, Wr, Lpm, and Hpm satisfy: This allows the motor 100 to have a large armature diameter with the shortest radial length. Combined with the size design of the stator slots 13 and magnets 3, the motor 100 within this size range has a high slot fill factor and a high magnetic load, which can significantly improve the output performance of the motor 100, improve the overload capacity and demagnetization performance of the motor 100, and reduce the electromagnetic cost of the motor 100 under the same output performance requirements.

[0150] In some embodiments of this invention, the refrigeration device is a refrigerator. However, this invention is not limited to this; the refrigeration device can also be an air conditioner, etc.

[0151] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0152] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric machine characterized in that, include: A stator core, comprising a yoke and a plurality of teeth, wherein the plurality of teeth are disposed on the inner peripheral wall of the yoke and spaced apart along the circumferential direction of the yoke; in the projection onto a plane perpendicular to the axis of the stator core, the diameter of the outer contour of the yoke or the diameter of the inscribed circle of the outer contour of the yoke is D1; ​​the maximum distance between the radial inner end face of the teeth and the axis of the stator core is D2 / 2; and the maximum dimension of the teeth is Ws in a direction perpendicular to the centerline of the teeth and the axial direction of the stator core. A rotor core is disposed radially inside the stator core. The rotor core includes multiple rotor units arranged along the circumferential direction of the rotor core. A magnetic slot is defined between two adjacent rotor units. The maximum distance between the radially opposite outer end faces of two rotor units is D3, and the minimum distance between the radially opposite inner end faces of two rotor units is D4. The maximum dimension of the rotor unit is Wr in a direction perpendicular to the centerline of the rotor unit and the axial direction of the rotor core. The magnets are multiple, each disposed within a plurality of magnet slots. The radial length of each magnet is Lpm, and the tangential length of each magnet is Hpm. Wherein, D1, D2, D3, D4, Ws, Wr, Lpm, and Hpm satisfy:

2. The electric machine of claim 1, wherein, The following conditions are met by D1, D2, D3, D4, Ws, Wr, Lpm, and Hpm:

3. The electric machine of claim 1, wherein, The number of the magnetic steels is N, the tangential length Hpm of the magnetic steel and the maximum distance D3 between the radially outer end faces of the two rotor units radially opposite to each other satisfy: And / or, the radial length Lpm of the magnet steel and the tangential length Hpm of the magnet steel satisfy:

4. The electric machine of claim 1, wherein, The number of rotor units is N, and the effective simplified cross-sectional area of ​​the rotor unit is S1, where S1 = π / 4N × (D3) 2 -D4 2 The radial length of the magnet is Lpm, the tangential length of the magnet is Hpm, and the cross-sectional area of ​​the magnet is S2, where S2 = Hpm × Lpm. S2 and S1 satisfy the following:

5. The electric machine of claim 1, wherein, The rotor unit includes a unit body and an inner magnetic bridge located at the radially inner end of the unit body. In a direction perpendicular to the centerline of the rotor unit and the axial direction of the rotor core, the minimum radial dimension of the inner end of the unit body is w1, the maximum dimension of the inner magnetic bridge is w2, and the maximum dimension of the rotor unit is Wr, satisfying the following: And / or, the rotor unit includes a unit body and an inner magnetic bridge located at the radial inner end of the unit body. Along the centerline direction of the rotor unit, the size of the inner magnetic bridge is h0. The maximum distance between the radially opposite outer end faces of two rotor units along the rotor core is D3, and the minimum distance between the radially opposite inner end faces of two rotor units along the rotor core is D4, and the following conditions are met:

6. The electric machine of claim 1, wherein, The multiple rotor units are spaced apart from each other; Alternatively, the rotor unit includes a unit body, an inner magnetic bridge located at the radial inner end of the unit body, and an outer magnetic bridge located at the radial outer end of the unit body. Along the circumferential direction of the rotor core, two adjacent rotor units are connected by the inner magnetic bridge and / or the outer magnetic bridge. And / or, the motor further includes an inner rotor core, the inner rotor core being disposed radially inside the rotor core, and at least a portion of the rotor unit being connected to the inner rotor core.

7. The electric machine of claim 6, wherein, The rotor core includes a plurality of rotor laminations stacked along the axial direction of the rotor core. Each rotor lamination includes a plurality of sub-units arranged circumferentially along the rotor lamination. Each sub-unit corresponds one-to-one with a plurality of rotor units. Each sub-unit has an inner magnetic bridge portion corresponding to the inner magnetic bridge and an outer magnetic bridge portion corresponding to the outer magnetic bridge. The motor also includes an inner rotor core. The rotor lamination includes a first lamination and a second lamination. Multiple sub-units of the first lamination are connected as a single unit via at least one of the inner magnetic bridge portion, the outer magnetic bridge portion, and the rotor inner core. Multiple sub-units of the second lamination are spaced apart from each other. The first lamination is located at both ends of the rotor core, and the second lamination and the first lamination are stacked together in the middle axial region of the rotor core.

8. The electric machine of claim 1, wherein, The number of rotor units is N. The rotor unit has a positioning hole that penetrates the rotor unit along the axial direction of the rotor core. The cross-section of the positioning hole includes an arc-shaped portion and a rectangular portion. The arc of the arc-shaped portion is a major arc. One long side of the rectangular portion is joined to the chord of the arc-shaped portion. The rectangular portion is located inside the arc-shaped portion along the radial direction of the rotor core. The diameter of the arc of the arc-shaped portion is Dz, the length of the rectangular portion is wz1, and the width of the rectangular portion is hz1, and the following conditions are met: And / or, the rotor unit has an injection hole penetrating the rotor unit along the axial direction of the rotor core. The cross-section of the injection hole is trapezoidal, and the injection hole has parallel long and short sides. Along the radial direction of the rotor core, the long side is located radially outside the short side and is longer than the length of the short side. The long side and the short side are perpendicular to the centerline of the rotor unit. The length of the long side is wz2, the length of the short side is wz3, and the height of the cross-section of the injection hole is hz2, satisfying:

9. The electric machine of claim 1, wherein, The motor also includes: The rotor inner core is located radially inside the rotor core. The rotor inner core has a shaft hole and a groove on its outer peripheral wall. There are multiple grooves, which are spaced apart along the circumferential direction of the rotor inner core and penetrate the rotor inner core along the axial direction of the rotor inner core.

10. The electric machine of claim 9, wherein, The maximum width of the groove is w4. The rotor unit includes a unit body and an inner magnetic bridge located at the radial inner end of the unit body. In the direction perpendicular to the center line of the rotor unit and the axial direction of the rotor core, the maximum size of the inner magnetic bridge is w2, and satisfies: 0.55≤w2 / w4≤0.

8. And / or, on a cross section perpendicular to the axial direction of the inner core of the rotor, the maximum distance between two adjacent grooves is w3, the tangential length of the magnet is Hpm, and satisfies: 0.5≤w3 / Hpm≤0.65; And / or, the minimum distance between the outer peripheral wall of the rotor inner core and the magnet is h1, the minimum distance between the bottom wall of the groove and the radial inner end face of the rotor core is h2, the minimum distance between the outer peripheral wall of the rotor inner core and the axis of the rotor inner core is D5 / 2, and the minimum distance between the inner peripheral wall of the rotor inner core and the axis of the rotor inner core is D6 / 2, and satisfies: 0.16≤2(h2-h1) / (D5-D6)≤0.

32.

11. The electric machine of claim 1, wherein, The rotor unit includes a unit body, an inner magnetic bridge located at the radial inner end of the unit body, and an outer magnetic bridge located at the radial outer end of the unit body. A clearance groove is provided at the angle where the inner magnetic bridge and the unit body are connected, and / or, a clearance groove is provided at the angle where the outer magnetic bridge and the unit body are connected; The magnet has a rectangular cross-section and at least the corners opposite the clearance groove are right angles.

12. The electric machine of any one of claims 1-11, wherein, The yoke includes a plurality of sub-yokes arranged along the circumferential direction of the stator core. Each of the sub-yokes corresponds to and is connected to a plurality of teeth. In the projection of a plane perpendicular to the axial direction of the stator core, the surface of the sub-yoke that faces away from the teeth is a straight line perpendicular to the center line of the corresponding teeth.

13. The electric machine of claim 12, wherein, In the projection of a plane perpendicular to the axial direction of the stator core, the surface of the sub-yoke near the tooth is a straight line perpendicular to the center line of the corresponding tooth.

14. A compressor characterized by, Includes the motor according to any one of claims 1-13.

15. A refrigeration appliance characterized in that, Includes the compressor according to claim 14.

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