Motor rotors, motor stators, motors, compressors and household appliances

Abstract

The invention discloses a motor rotor, a motor stator, a motor, a compressor and a household appliance. The motor rotor comprises a rotor punching, a first permanent magnet and a second permanent magnet, and the shapes of the first permanent magnet and the second permanent magnet are different; the rotor punching comprises a first slot and a second slot, the first slot and the second slot are arranged at intervals, a magnetic isolation bridge is arranged between the first slot and the second slot, and the first slot is provided with a notch on a side away from the center of the rotor punching; the shape of the first slot is adapted to the shape of the first permanent magnet, and the first permanent magnet is accommodated in the first slot, and the shape of the second slot is adapted to the shape of the second permanent magnet, and the second permanent magnet is accommodated in the second slot. In the motor rotor, the first permanent magnet and the second permanent magnet have different shapes and are arranged at intervals, and the magnetic circuits of the two are superimposed, which can make the magnetic flux density higher, increase the motor output torque, and improve the motor efficiency. At the same time, the first slot is provided with a notch, which can enhance the magnetic field strength, reduce the permanent magnet leakage coefficient at the slot position, and improve the utilization rate of the permanent magnet.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a motor rotor, a motor stator, a motor, a compressor and a household appliance. Background Art

[0002] With the development of technology, people have put forward higher requirements on the efficiency of motors and compressors and household appliances that use motors. However, due to the limited rotor space, it has become increasingly difficult to improve the torque and power density of the motor. Therefore, how to effectively utilize the rotor space and improve the torque and power density of the motor is a key issue in the research of permanent magnet motors. Summary of the invention

[0003] The embodiments of the present invention provide a motor rotor, a motor stator, a motor, a compressor and a household appliance to solve at least one of the above-mentioned technical problems.

[0004] An embodiment of the present invention provides a motor rotor including a rotor punching, a first permanent magnet and a second permanent magnet, wherein the first permanent magnet and the second permanent magnet have different shapes;

[0005] The rotor punching sheet comprises a first slot and a second slot, the first slot and the second slot are arranged at intervals, a magnetic isolation bridge is arranged between the first slot and the second slot, and the first slot is provided with a notch on a side away from the center of the rotor punching sheet;

[0006] The shape of the first groove matches the shape of the first permanent magnet, and the first permanent magnet is accommodated in the first groove. The shape of the second groove matches the shape of the second permanent magnet, and the second permanent magnet is accommodated in the second groove.

[0007] In the above-mentioned motor rotor, the first permanent magnet and the second permanent magnet have different shapes and are arranged at intervals. The superposition of the magnetic circuits of the two can make the magnetic flux density higher, increase the motor output torque, and improve the motor efficiency. At the same time, the first slot is provided with a notch, which can enhance the magnetic field strength, reduce the permanent magnet leakage coefficient at the notch position, and improve the utilization rate of the permanent magnet.

[0008] In some embodiments, the magnetic isolation bridge extends in the radial direction of the rotor punching sheet, and the width of the magnetic isolation bridge in the circumferential direction of the rotor punching sheet is greater than or equal to 0.2 mm, and / or;

[0009] A first through hole is formed at the center of the rotor punching sheet, and a distance between a periphery of the first through hole and an edge of the second groove is greater than or equal to 1 mm.

[0010] In some embodiments, the first slot includes a first region and a second region connected to each other, the width of the first region is constant, and the width of the second region gradually decreases in a direction away from the first region, and the first permanent magnet includes a first part and a second part connected to each other, the shape of the first part is adapted to the shape of the first region, and the shape of the second part is adapted to the shape of the second region;

[0011] Along the radial direction of the rotor punching, the first region is far away from the center of the rotor punching, the second region is close to the center of the rotor punching, and the second groove is close to the center of the rotor punching.

[0012] In some embodiments, along the radial direction of the rotor punching, the ratio of the thickness of the first portion to the thickness of the first permanent magnet as a whole along the radial direction of the rotor punching is in the range of [0.25, 0.85], and / or;

[0013] Along the circumferential direction of the rotor punching sheet, a ratio of the minimum width of the second portion to the width of the first portion is in a range of [0.1, 0.9], and / or;

[0014] The ratio of the width of the notch to the width of the first portion is in the range of [0.3, 0.9], and / or;

[0015] The ratio of the width of the first portion to the overall thickness of the first permanent magnet is in the range of [0.5, 1.3].

[0016] In some embodiments, the second groove is rectangular in shape.

[0017] In some embodiments, a ratio of the thickness of the second permanent magnet to the width of the second permanent magnet is in the range of [0.4, 1].

[0018] In some embodiments, the magnetizing direction of the first permanent magnet is along the radial direction of the rotor punching, and the magnetizing direction of the second permanent magnet is along the circumferential direction of the rotor punching.

[0019] In some embodiments, a first fixing hole is opened between the plurality of the first grooves, and a first fastener passes through the first fixing holes on the plurality of the rotor punchings to fix and connect the plurality of the rotor punchings.

[0020] In certain embodiments, the first permanent magnet and the second permanent magnet are ferrite permanent magnets.

[0021] A motor stator provided in an embodiment of the present invention includes a stator punching sheet, a mounting hole is provided at the center of the stator punching sheet, the mounting hole is used to accommodate the motor rotor, and the stator punching sheet meets at least one of the following conditions:

[0022] The stator punching sheet comprises a stator yoke and a plurality of stator teeth, wherein the plurality of stator teeth are evenly arranged on the stator yoke and extend toward the center of the stator punching sheet along the radial direction of the mounting hole, and a stator slot is formed between every two stator teeth;

[0023] The width of the stator yoke at its narrowest point is greater than or equal to 2 mm;

[0024] The ratio of the width of the narrowest part of the stator yoke to the width of the stator tooth is in the range of [0.2, 0.5];

[0025] Along the circumference of the mounting hole, the stator tooth portion is formed with a tooth shoe portion, and the minimum width of the tooth shoe portion is greater than or equal to 0.7 mm;

[0026] The depth of the stator slots ranges from [5 mm, 12 mm].

[0027] In the above-mentioned motor stator, the first permanent magnet and the second permanent magnet have different shapes, and the first permanent magnet and the second permanent magnet are arranged at an interval. The superposition of the magnetic circuits formed by the first permanent magnet and the second permanent magnet can make the magnetic flux density higher, thereby increasing the motor output torque and improving the motor efficiency.

[0028] An embodiment of the present invention provides a motor including the motor rotor described in any one of the above embodiments, and / or the motor stator described in the above embodiments.

[0029] A compressor provided in an embodiment of the present invention includes the motor of the above embodiment.

[0030] A household appliance provided in an embodiment of the present invention includes the compressor of the above embodiment.

[0031] In the above-mentioned motor, compressor and household appliance, the first permanent magnet and the second permanent magnet have different shapes and are arranged at intervals. The superposition of the magnetic circuits of the two can make the magnetic flux density higher, increase the motor output torque, and improve the motor efficiency. At the same time, the first slot is provided with a notch, which can enhance the magnetic field strength, reduce the permanent magnet leakage coefficient at the notch position, and improve the utilization rate of the permanent magnet.

[0032] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0034] Figure 1is a schematic cross-sectional view of a motor rotor according to an embodiment of the present invention;

[0035] Figure 2 is another cross-sectional schematic diagram of a motor rotor according to an embodiment of the present invention;

[0036] Figure 3 is a schematic structural diagram of a rotor punching sheet according to an embodiment of the present invention;

[0037] Figure 4 and Figure 5 is a cross-sectional schematic diagram of a first permanent magnet according to an embodiment of the present invention;

[0038] Figure 6 and Figure 7 is a cross-sectional schematic diagram of a second permanent magnet according to an embodiment of the present invention;

[0039] Figure 8 is a schematic structural diagram of a motor stator according to an embodiment of the present invention;

[0040] Fig. 9 is a partial cross-sectional schematic diagram of a motor according to an embodiment of the present invention;

[0041] Fig.10 It is a schematic diagram of the distribution of magnetic field lines of force of the motor according to the embodiment of the present invention.

[0042] Description of main component symbols:

[0043] Rotor punching 10, first slot 16, second slot 18, magnetic isolation bridge 19, first permanent magnet 20, second permanent magnet 22, first region 24, second region 26, first part 28, second part 30, notch 32, first fixing hole 34, first through hole 35, second through hole 36, stator punching 37, mounting hole 38, stator yoke 40, stator tooth 42, stator slot 44, tooth shoe 45, second fixing hole 46, motor rotor 100, motor stator 200, motor 300. DETAILED DESCRIPTION

[0044] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it 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 directly connected or indirectly connected through an intermediate medium. 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 invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] The disclosure herein provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described herein. Of course, they are merely examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art may appreciate the application of other processes and / or the use of other materials.

[0049] With the development of technology, people have put forward higher requirements on the efficiency of motors and compressors and household appliances that use motors. However, due to the limited rotor space, it has become increasingly difficult to improve the torque and power density of the motor. Therefore, how to effectively utilize the rotor space and improve the torque and power density of the motor is a key issue in the research of permanent magnet motors.

[0050] See also Figures 1 to 3 An electric motor rotor 100 provided in an embodiment of the present invention includes a rotor punching 10, a first permanent magnet 20 and a second permanent magnet 22, and the first permanent magnet 20 and the second permanent magnet 22 have different shapes.

[0051] The rotor punching 10 is formed with a first groove 16 and a second groove 18, and the first groove 16 and the second groove 18 are arranged at intervals. A magnetic isolation bridge 19 is arranged between the first groove 16 and the second groove 18. The first groove 16 is provided with a notch 32 on the side away from the center of the rotor punching 10. The shape of the first groove 16 is adapted to the shape of the first permanent magnet 20, and the first permanent magnet 20 is accommodated in the first groove 16. The shape of the second groove 18 is adapted to the shape of the second permanent magnet 22, and the second permanent magnet 22 is accommodated in the second groove 18.

[0052] In the above-mentioned motor rotor 100, the first permanent magnet 20 and the second permanent magnet 22 have different shapes, and the first permanent magnet 20 and the second permanent magnet 22 are arranged at intervals. The superposition of the magnetic circuits formed by the first permanent magnet 20 and the second permanent magnet 22 can make the magnetic flux density higher, thereby increasing the output torque of the motor 300 and improving the efficiency of the motor 300. At the same time, the first slot 16 is provided with a notch 32, which can enhance the magnetic field strength, reduce the permanent magnet leakage coefficient at the position of the notch 32, and improve the utilization rate of the permanent magnet.

[0053] Specifically, the motor rotor 100 includes a rotor core, which is formed by laminating a plurality of rotor sheets 10. The rotor sheets 10 are formed with a first slot 16 and a second slot 18, which are arranged at intervals, and a magnetic isolation bridge 19 is arranged between the first slot 16 and the second slot 18.

[0054] That is, the first slots 16 and the second slots 18 are arranged alternately, and after a plurality of rotor punching sheets 10 are stacked, a plurality of first slots 16 are aligned, a plurality of second slots 18 are aligned, the first permanent magnets 20 are inserted in the first slots 16, and the second permanent magnets 22 are inserted in the second slots 18. In this way, the first permanent magnets 20 and the second permanent magnets 22 are evenly distributed in the rotor core.

[0055] The first permanent magnet 20 and the second permanent magnet 22 have different shapes and are spaced apart from each other. When the motor 300 is working, the magnetic circuits generated by the first permanent magnet 20 and the second permanent magnet 22 in two adjacent first permanent magnets 20 are superimposed, which can make the magnetic flux density higher, thereby increasing the output torque of the motor 300 and improving the efficiency of the motor 300.

[0056] The first permanent magnet 20 matches the first slot 16, so that the outer peripheral wall of the first permanent magnet 20 is closely fitted with the inner wall of the first slot 16. The second permanent magnet 22 matches the second slot 18, so that the outer peripheral wall of the second permanent magnet 22 is closely fitted with the inner wall of the second slot 18, so that no gap is generated between the first slot 16 and the first permanent magnet 20, and between the second slot 18 and the second permanent magnet 22, thereby reducing the generation of leakage magnetic flux and improving the efficiency of the motor 300.

[0057] A notch 32 is provided on the first slot 16 at a side away from the center of the rotor sheet 10 , so as to reduce the magnetic leakage coefficient and improve the utilization rate of the permanent magnet.

[0058] See also Figure 1 In some embodiments, the magnetic isolation bridge 19 extends in the radial direction of the rotor punching 10, and the width D0 of the magnetic isolation bridge 19 along the circumferential direction of the rotor punching 10 is greater than or equal to 0.2 mm.

[0059] In this way, it can be ensured that after the rotor core is installed on the motor 300, the mechanical strength required when the motor 300 is running can be met.

[0060] Specifically, the magnetic isolation bridge 19 plays a role in limiting magnetic leakage by saturating the magnetic flux at the magnetic bridge. Therefore, from the perspective of preventing magnetic leakage, the smaller the thickness of the magnetic isolation bridge 19, the better the magnetic isolation effect. However, the centrifugal force generated by the high-speed rotation of the rotor damages the rotor structure, and the distance between the magnetic isolation bridge 19 along the circumferential width D0 of the rotor punching 10 directly affects the overall stiffness of the rotor, thereby reducing its mechanical strength.

[0061] The groove distance D0 between the first groove 16 and the second groove 18 can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, or 1.1 mm, or the groove distance D0 between the first groove 16 and the second groove 18 can be any value greater than 0.2 mm.

[0062] It is understandable that the slot distance D0 between the first slot 16 and the second slot 18 is related to the size of the rotor sheet 10, the permanent magnet and the size of the motor 300 to which it is adapted, and the slot distance D0 can be determined according to the size requirements of the rotor sheet 10, the permanent magnet and the motor 300. Figure 2 and Figure 3 In some embodiments, a first through hole 35 is formed at the center of the rotor punching 10 , and a distance D1 between the periphery of the first through hole 35 and the edge of the second slot 18 is greater than or equal to 1 mm.

[0063] In this way, the mechanical strength of the motor 300 during operation can be met.

[0064] Specifically, the first through hole 35 includes a crankcase mounting hole 38, and a distance D1 between the periphery of the first through hole 35 and the edge of the second slot 18 is greater than or equal to 1 mm. For example, the distance D1 between the periphery of the first through hole 35 and the edge of the second slot 18 is 1 mm, 1.2 mm, 1.5 mm, 2 mm, 2.3 mm, 2.8 mm, 3 mm, 4 mm, 5 mm or 6 mm, or any other value greater than 1 mm. If the distance D1 between the periphery of the first through hole 35 and the edge of the second slot 18 is too small, it cannot meet the mechanical strength of the motor 300 during operation, and if the distance D1 between the periphery of the first through hole 35 and the edge of the second slot 18 is too large, it is not suitable for miniaturization of the motor 300.

[0065] The center of the rotor punching 10 also has a second through hole 36, and the second through hole 36 includes a crankshaft mounting hole 38. It is understandable that when multiple rotor punchings 10 are stacked, a group of rotor punchings 10 with first through holes 35 can be selected to be stacked, and a group of rotor punchings 10 with second through holes 36 can be selected to be stacked, and then the two groups of rotor punchings 10 are stacked and fixed.

[0066] See also Figure 3 and Figure 4 In some embodiments, the first slot 16 includes a first region 24 and a second region 26 that are connected to each other, the width of the first region 24 remains unchanged, and the width of the second region 26 gradually decreases in a direction away from the first region 24. The first permanent magnet 20 includes a first portion 28 and a second portion 30 that are connected to each other, the shape of the first portion 28 is adapted to the shape of the first region 24, and the shape of the second portion 30 is adapted to the shape of the second region 26.

[0067] In this way, the first slot 16 is adapted to the shape of the first permanent magnet 20 , and the size of the first permanent magnet 20 can be increased within a limited space, so that the magnetic field intensity generated by the first permanent magnet 20 is stronger.

[0068] Specifically, the first groove 16 includes a first region 24 and a second region 26 connected to each other, wherein the first region 24 is far from the center of the rotor sheet 10, and the second region 26 is close to the center of the rotor sheet 10. The width of the first region 24 is constant, and the width of the second region 26 gradually decreases in a direction away from the first region 24. The widths of the first region 24 and the second region 26 refer to the dimensions of the first region 24 and the second region 26 along the circumferential direction of the rotor sheet 10.

[0069] The width of the first region 24 remains unchanged, which can increase the size of the first permanent magnet 20, thereby making the magnetic field strength generated by the first permanent magnet 20 stronger. The width of the second region 26 gradually decreases away from the first region 24, which can leave space for the second slot 18.

[0070] like Figure 3 and Figure 4 As shown, the first permanent magnet 20 includes a first portion 28 and a second portion 30. The shape of the first portion 28 matches the shape of the first region 24. The shape of the second portion 30 matches the shape of the second region 26. The cross section of the first permanent magnet 20 is a combination of a rectangle and a trapezoid.

[0071] See also Figure 2 In some embodiments, along the radial direction of the rotor punching 10 , the first region 24 is far away from the center of the rotor punching 10 , the second region 26 is close to the center of the rotor punching 10 , and the second groove 18 is close to the center of the rotor punching.

[0072] In this way, the first slot 16 and the second slot 18 can be arranged in coordination with each other, thereby increasing the output torque of the motor 300 and improving the efficiency of the motor 300 .

[0073] Specifically, the first groove 16 and the second groove 18 are arranged at intervals, the first area 24 of the first groove 16 is far away from the center of the rotor punching 10, the second area 26 is close to the center of the rotor punching 10, and along the circumference of the rotor punching 10, the edge of the second area 26 of the first groove 16 is parallel to the edge of the second groove 18, so that the fit between the first permanent magnet 20 and the second permanent magnet 22 can be more compact.

[0074] In other embodiments, the second slot 18 is located away from the center of the rotor plate and closer to the first region 24 of the first slot 16 .

[0075] See also Figure 4 In some embodiments, along the radial direction of the rotor sheet 10 , the ratio of the thickness H3 of the first portion 28 to the overall thickness H1 of the first permanent magnet 20 is in the range of [0.25, 0.85].

[0076] In this way, according to the ratio of the thickness H3 of the first portion 28 of the first permanent magnet 20 to the overall thickness H1 of the first permanent magnet 20 , the shape of the first permanent magnet 20 can be adjusted to accommodate motors 300 of different models and sizes.

[0077] Specifically, the thickness refers to the dimension of the first permanent magnet 20 along the radial direction of the rotor sheet 10. The ratio of the thickness H3 of the first portion 28 to the overall thickness H1 of the first permanent magnet 20 is in the range of [0.25, 0.85], that is, 0.25≤H3 / H1≤0.85. The ratio of the thickness H3 of the first portion 28 to the overall thickness H1 of the first permanent magnet 20 may be 0.25, 0.3, 0.32, 0.38, 0.4, 0.43, 0.5, 0.58, 0.6, 0.65, 0.7, 0.78, 0.8 or 0.85, or any other value in the range of [0.25, 0.85].

[0078] See also Figure 4 In some embodiments, along the circumferential direction of the rotor sheet 10 , the ratio of the minimum width L2 of the second portion 30 to the width L1 of the first portion 28 is in the range of [0.1, 0.9].

[0079] In this way, according to the ratio of the minimum width L2 of the second portion 30 of the first permanent magnet 20 to the width L1 of the first portion 28 , the shape of the first permanent magnet 20 can be adjusted to accommodate motors 300 of different models and sizes.

[0080] Specifically, the width refers to the dimension of the first permanent magnet 20 along the circumferential direction of the rotor sheet 10. The ratio of the minimum width L2 of the second portion 30 to the width L1 of the first portion 28 is in the range of [0.1, 0.9], that is, 0.1≤L2 / L1≤0.9. The ratio of the minimum width L2 of the second portion 30 to the width L1 of the first portion 28 can be 0.1, 0.2, 0.25, 0.3, 0.35, 0.4, 0.5, 0.6, 0.7, 0.8 or 0.9, or any other value in the range of [0.25, 0.85].

[0081] See also Figure 3 In some embodiments, the ratio of the width TK of the notch 32 to the width L1 of the first portion 28 is in the range of [0.3, 0.9].

[0082] In this way, the magnetic field strength can be enhanced, the permanent magnet leakage coefficient at the slot 32 can be reduced, and the utilization rate of the permanent magnet can be improved.

[0083] Specifically, a notch 32 is provided on the first slot 16 at a side away from the center of the rotor sheet 10, which can reduce the magnetic flux leakage coefficient and improve the utilization rate of the permanent magnet. The width TK of the notch 32 has a value range of [0.3, 0.9]. For example, the ratio of the width TK of the notch 32 to the width L1 of the first portion 28 can be 0.3, 0.35, 0.4, 0.47, 0.5, 0.52, 0.58, 0.6, 0.65, 0.7, 0.77, 0.8 or 0.9. Alternatively, the ratio of the width TK of the notch 32 to the width L1 of the first portion 28 can be any other value within [0.3, 0.9].

[0084] In some embodiments, the ratio of the width L1 of the first portion 28 to the overall thickness H1 of the first permanent magnet 20 is in the range of [0.5, 1.3].

[0085] In this way, the first permanent magnet 20 along the magnetic circuit direction is thicker and has a stronger anti-demagnetization capability. Fig.10 As shown, along the magnetic circuit direction, the first permanent magnet 20 is thicker, which can improve the anti-demagnetization capability of the first permanent magnet 20 .

[0086] The ratio of the width L1 of the first portion 28 to the overall thickness H1 of the first permanent magnet 20 may be 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2 or 1.3, or any other value in the range of [0.5, 1.3].

[0087] See also Figure 1 and Figure 6 In some embodiments, the second slot 18 is rectangular in shape.

[0088] In this way, the first slot 16 and the second slot 18 cooperate with each other, so that the first permanent magnet 20 and the second permanent magnet 22 accommodated in the first slot 16 and the second slot 18 can cooperate more compactly.

[0089] Specifically, along the circumferential direction of the rotor sheet 10, the edge of the second region 26 of the first slot 16 is parallel to the edge of the second slot 18, so that the first permanent magnet 20 and the second permanent magnet 22 can be more compactly matched through the matching of the first slot 16 and the second slot 18. When the size of the rotor core is the same, the size of the first permanent magnet 20 and the second permanent magnet 22 can be effectively increased.

[0090] In the illustrated embodiment, the number of the first permanent magnet 20 and the number of the second permanent magnet 22 are both 6. However, in other embodiments, the number of the first permanent magnet 20 and the second permanent magnet 22 is not limited to 6, and can be 4, 8, 12 or more, which is not specifically limited here.

[0091] In other embodiments, the cross-sections of the first groove 16 and the second groove 18 may also be other polygonal shapes.

[0092] See also Figure 6 In some embodiments, the ratio of the thickness H2 of the second permanent magnet 22 to the width L3 of the second permanent magnet 22 is in the range of [0.4, 1].

[0093] In this way, according to the ratio of the thickness H2 of the second permanent magnet 22 to the width L3 of the second permanent magnet 22 , the shape of the second permanent magnet 22 can be adjusted to match with different first permanent magnets 20 to adapt to motors 300 of different models and sizes.

[0094] Specifically, the ratio of the thickness H2 of the second permanent magnet 22 to the width L3 of the second permanent magnet 22 is in the range of [0.3, 1], that is, 0.4≤H2 / L3≤1. For example, the ratio of the thickness H2 of the second permanent magnet 22 to the width L3 of the second permanent magnet 22 can be 0.4, 0.46, 0.5, 0.55, 0.6, 0.68, 0.7, 0.8, 0.9 or 1.0, or any other value in the range of [0.3, 1].

[0095] When H2 / L3 is equal to 0.4, the cross section of the second permanent magnet 22 is a rectangle. Fig.10 As shown, along the magnetic circuit direction, the second permanent magnet 22 is thicker, which can improve the anti-demagnetization capability of the second permanent magnet 22 .

[0096] When H2 / L3 is equal to 1, the cross section of the second permanent magnet 22 is a square. The shape of the second permanent magnet 22 can be designed according to the shape of the first permanent magnet 20, so that the first permanent magnet 20 and the second permanent magnet 22 are better distributed.

[0097] In summary, if Figure 1 As shown, in the cross section taken along the plane perpendicular to the axis of the motor rotor, the sum of the cross-sectional areas of the first permanent magnet 20 and the second permanent magnet 22 can account for 40%-50% of the overall cross-sectional area. The permanent magnet has a large area, a high output torque, and a high utilization rate of the permanent magnet, which can improve the efficiency of the motor by more than 2%.

[0098] See also Figure 2 In some embodiments, the magnetizing direction of the first permanent magnet 20 is along the radial direction of the rotor punching 10 , and the magnetizing direction of the second permanent magnet 22 is along the circumferential direction of the rotor punching 10 .

[0099] In this way, the magnetic field sinusoidality of the first permanent magnet 20 and the second permanent magnet 22 can be made higher, so as to improve the operation stability and reliability of the motor 300 .

[0100] Specifically, for the first permanent magnet 20 and the second permanent magnet 22, their magnetization directions are parallel to the length direction of their shortest sides. Figure 5 and Figure 7 As shown in the figure, the arrow indicates the magnetization direction of the permanent magnet. After the first permanent magnet 20 and the second permanent magnet 22 are installed in the first slot 16 and the second slot 18, the magnetization direction of the first permanent magnet 20 is along the radial direction of the rotor core, and the magnetization direction of the second permanent magnet 22 is along the circumferential direction of the rotor core, as shown in FIG. Figure 2 As shown, the arrow direction in the figure is the magnetization direction of the first permanent magnet 20 and the second permanent magnet 22.

[0101] The magnetization directions of every two adjacent first permanent magnets 20 are opposite, that is, for the two adjacent first permanent magnets 20, the magnetization directions are opposite or opposite along the circumferential direction of the rotor punching 10. The magnetization directions of every two adjacent second permanent magnets 22 are opposite. That is, for the two adjacent second permanent magnets 22, the magnetization directions are alternately arranged along the direction toward the center of the rotor punching 10 and the direction away from the center of the rotor punching 10. In this way, the magnetic field sinusoidality of the first permanent magnet 20 and the second permanent magnet 22 can be made higher, so as to improve the operating stability and reliability of the motor 300.

[0102] The magnetizing direction of the first permanent magnet 20 is along the radial direction of the rotor punching 10, and the magnetizing direction of the second permanent magnet 22 is along the circumferential direction of the rotor punching 10, forming a series magnetic circuit between two adjacent first permanent magnets 20, and at the same time forming a parallel magnetic circuit between the first permanent magnet 20 and the second permanent magnet 22, so that the magnetic flux density is higher, thereby increasing the output torque of the motor 300 and improving the efficiency of the motor 300.

[0103] See also Figure 2 In some embodiments, a first fixing hole 34 is opened between the plurality of first grooves 16 , and a first fastener passes through the first fixing holes 34 on the plurality of rotor punchings 10 to fix and connect the plurality of rotor punchings 10 .

[0104] In this way, the first fixing hole 34 can cooperate with the first fastener to stack and fix the plurality of rotor punching sheets 10 .

[0105] Specifically, the rotor core has a plurality of rotor punchings 10, and the plurality of rotor punchings 10 are stacked and arranged, so that the plurality of rotor punchings 10 are stacked and connected to form the rotor core.

[0106] The fastener connection has high precision and constant fastening force, so that the stator core can have high position accuracy and axial accuracy. At the same time, the fastener connection has high strength and reliability and can withstand large loads and vibrations, thereby ensuring the reliability of the operation of the motor 300.

[0107] There are at least two first fixing holes 34 to ensure the reliability of fixing. In the illustrated embodiment, a first fixing hole 34 is opened between every two first grooves 16, so that the rotor punching 10 can be uniformly stressed at each position and the connection is firm and reliable.

[0108] In other embodiments, the number of the first fixing holes 34 may be any other value greater than two, and may be specifically designed according to the structure of the rotor punching 10 , and is not specifically limited here.

[0109] In certain embodiments, the first permanent magnet 20 and the second permanent magnet 22 are ferrite permanent magnets.

[0110] In this way, the cost of the permanent magnets can be reduced, making the motor rotor 100 more economical.

[0111] Specifically, the remanence of ferrite is Br<0.47T. Remanence, also known as residual magnetization, is the magnetic induction intensity exhibited by a permanent magnet when the external magnetic field is removed after the permanent magnet is magnetized to technical saturation. It is one of the most important characteristics of a permanent magnet, indicating the maximum magnetization intensity that a permanent magnet can produce.

[0112] The low grade of the ferrite permanent magnet can reduce the cost of the permanent magnet when the amount of the permanent magnet is large. At the same time, the motor rotor 100 is provided with a notch 32 in the first slot 16, and the thickness of the first permanent magnet 20 and the second permanent magnet 22 along the magnetic circuit direction is thicker, so that the motor rotor 100 can maintain good working performance when the grade of the permanent magnet is low.

[0113] In summary, the first permanent magnet 20 and the second permanent magnet 22 have different shapes, and the first permanent magnet 20 and the second permanent magnet 22 are arranged at intervals. When the motor 300 is working, the magnetic circuits generated by the first permanent magnet 20 and the second permanent magnet 22 in two adjacent first permanent magnets 20 are superimposed, which can increase the magnetic flux density, reduce the current under the same load, and reduce the line loss, so that the efficiency performance of the motor 300 can be improved. Among them, the distribution effect of the magnetic field lines of the motor is as follows: Fig.10 shown.

[0114] See also Figure 8 A motor stator 200 provided in an embodiment of the present invention includes a stator punching sheet 37, a mounting hole 38 is provided at the center of the stator punching sheet 37, and the mounting hole 38 is used to accommodate the motor rotor 100 of any of the above embodiments.

[0115] Specifically, the motor stator 200 includes a plurality of stator punching sheets 37, and the plurality of stator punching sheets 37 are stacked and arranged, so that the plurality of stator punching sheets 37 are stacked and connected to form a stator core to improve magnetic permeability. The motor rotor 100 is installed in the motor stator 200, and a magnetic field is generated by a permanent magnet so that the excitation of the stator drives the permanent magnet to drive the rotor to rotate.

[0116] See also Figure 8 In some embodiments, the stator punching sheet 37 includes a stator yoke 40 and a plurality of stator teeth 42 , wherein the plurality of stator teeth 42 are evenly arranged on the stator yoke 40 and extend toward the center of the stator punching sheet 37 along the radial direction of the mounting hole 38 , and a stator slot 44 is formed between every two stator teeth 42 .

[0117] Thus, a stator slot 44 is formed between two adjacent stator teeth to allow the winding to be wound around the stator tooth portion 42 of the stator core.

[0118] Specifically, a plurality of stator teeth 42 are provided on each stator punching sheet 37, and a stator slot 44 is formed between two adjacent stator teeth 42. In this way, a plurality of stator punching sheets 37 are stacked and connected to form a stator core. The stator teeth 42 of a plurality of stator punching sheets 37 are stacked, and a stator slot 44 is formed between two adjacent stator teeth, so that the winding can be wound on the stator teeth of the stator core.

[0119] See also Figure 8 In some embodiments, the width Yoke of the stator yoke 40 at its narrowest point is greater than or equal to 2 mm.

[0120] In this way, a reasonable value of the width Yoke at the narrowest part of the stator yoke 40 can be determined according to the size limitation of the width Yoke at the narrowest part of the stator yoke 40 and other size limitations of the motor stator 200 .

[0121] Specifically, the width Yoke of the narrowest part of the stator yoke 40 is greater than or equal to 2 mm, that is, the width Yoke of the narrowest part of the stator yoke 40 can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 6 mm, 7 mm, 8 mm or any other value greater than 2 mm. If the width at the narrowest part is too small, the magnetic density at that place may be too high, thereby causing magnetic saturation. Magnetic saturation will cause the magnetic permeability to decrease and may affect the efficiency of the motor 300.

[0122] In addition, if the width Yoke of the narrowest part of the stator yoke 40 is too small, the mechanical strength of the part may be insufficient, and deformation or damage may occur easily during operation.

[0123] See also Figure 8 In some embodiments, the ratio of the width Yoke at the narrowest point of the stator yoke 40 to the width TtH of the stator tooth 42 is in the range of [0.2, 0.5].

[0124] In this way, a reasonable value of the ratio of the width Yoke at the narrowest point of the stator yoke 40 to the width TtH of the stator tooth 42 can be determined based on the limitation of the ratio of the width Yoke at the narrowest point of the stator yoke 40 to the width TtH of the stator tooth 42 and other size limitations of the motor stator 200.

[0125] Specifically, the ratio of the width Yoke at the narrowest part of the stator yoke 40 to the width TtH of the stator tooth 42 is in the range of [0.2, 0.5], that is, 0.2≤Yoke / TtH≤0.5. For example, the ratio of the width Yoke at the narrowest part of the stator yoke 40 to the width TtH of the stator tooth 42 may be 0.2, 0.23, 0.27, 0.3, 0.35, 0.38, 0.4, 0.41, 0.47 or 0.5. Alternatively, the ratio of the width Yoke at the narrowest part of the stator yoke 40 to the width TtH of the stator tooth 42 may be any other value in the range [0.2, 0.5].

[0126] See also Figure 8 In some embodiments, the stator tooth portion 42 is formed with a tooth shoe portion 45 along the circumference of the mounting hole 38 , and the minimum width Hs0 of the tooth shoe portion 45 is greater than or equal to 0.7 mm.

[0127] In this way, a reasonable value of the minimum width Hs0 of the tooth shoe portion 45 can be determined according to the limitation of the minimum width Hs0 of the tooth shoe portion 45 and other size limitations of the motor stator 200 .

[0128] Specifically, a tooth shoe portion 45 is formed on the stator tooth portion 42 along the circumference of the mounting hole 38 to make the magnetic field distribution of the stator more uniform, so as to improve the efficiency of the motor 300. The tip of the tooth shoe portion 45, that is, the minimum width Hs0 of the tooth shoe portion 45 is greater than or equal to 0.7 mm. For example, the minimum width Hs0 of the tooth shoe portion 45 can be 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1.0 mm, 1.1 mm, 1.2 mm or 1.3 mm, or any value greater than 0.7 mm.

[0129] See also Figure 8 In some embodiments, the slot depth C1 of the stator slot 44 has a value range of [5 mm, 12 mm].

[0130] In this way, a reasonable value of the minimum width Hs0 of the tooth shoe portion 45 can be determined according to the limitation of the slot depth C1 of the stator slot 44 and other size limitations of the motor stator 200 .

[0131] Specifically, the slot depth affects the arrangement of the stator winding and the distribution of the electromagnetic field. For example, the slot depth C1 of the stator slot 44 can be 5 mm, 5.5 mm, 6 mm, 6.3 mm, 7 mm, 7.4 mm, 8 mm, 8 mm, 10 mm, 11 mm or 12 mm, or any other value within the range of [5 mm, 12 mm].

[0132] A deeper slot can provide more space to accommodate the winding, thereby increasing the number of turns and / or the wire cross-section of the winding, which is beneficial to improving the electromagnetic performance and output power of the motor 300. At the same time, too large a slot depth will increase the weight and cost of the stator core, and may reduce the mechanical strength.

[0133] See also Figure 8 In some embodiments, the stator yoke 40 is provided with a second fixing hole 46 , and the second fastener passes through a plurality of second fixing holes 46 to fix and connect a plurality of stator punching sheets 37 .

[0134] In this way, the plurality of stator punching sheets 37 can be stacked and fixed by the cooperation between the second fixing hole 46 and the second fastener.

[0135] Specifically, the stator yoke 40 is provided with a second fixing hole 46. When a plurality of stator punching sheets 37 are stacked, the plurality of second fixing holes 46 overlap, and the second fastener penetrates the plurality of second fixing holes 46 to fix and connect the plurality of stator punching sheets 37. The fastener connection has high precision and constant fastening force, and can make the stator core have high positional precision and axial precision. At the same time, the fastener connection has high strength and reliability, and can withstand large loads and vibrations, thereby ensuring the reliability of the operation of the motor 300.

[0136] There are at least two second fixing holes 46 to ensure the reliability of fixing. In the illustrated embodiment, a second fixing hole 46 is respectively provided at the four corners of the stator punching sheet 37, so that the force at each position of the stator punching sheet 37 is uniform and the connection is firm and reliable.

[0137] In other embodiments, the number of the second fixing holes 46 may be any other value greater than two, and may be specifically designed according to the structure of the stator punching sheet 37 , and is not specifically limited here.

[0138] In the above-mentioned motor stator 200, the first permanent magnet 20 and the second permanent magnet 22 have different shapes, and the first permanent magnet 20 and the second permanent magnet 22 are arranged at intervals. The superposition of the magnetic circuits formed by the first permanent magnet 20 and the second permanent magnet 22 can make the magnetic flux density higher, thereby increasing the output torque of the motor 300 and improving the efficiency of the motor 300.

[0139] See also Fig. 9 An embodiment of the present invention provides a motor 300 including the motor rotor 100 of any of the above embodiments, and / or the motor stator 200 of the above embodiments.

[0140] Specifically, the motor rotor 100 is installed in the motor stator 200, and a magnetic field is generated by a permanent magnet, so that the excitation of the stator drives the permanent magnet to drive the rotor to rotate.

[0141] A compressor provided in an embodiment of the present invention includes the motor 300 of the above embodiment.

[0142] A household appliance provided in an embodiment of the present invention includes the compressor of the above embodiment.

[0143] Specifically, household appliances include but are not limited to refrigeration equipment such as air conditioners and refrigerators.

[0144] In the above-mentioned motor 300, compressor and household appliance, the first permanent magnet 20 and the second permanent magnet 22 have different shapes, and the first permanent magnet 20 and the second permanent magnet 22 are arranged at intervals. The superposition of the magnetic circuits formed by the first permanent magnet 20 and the second permanent magnet 22 can make the magnetic flux density higher, thereby increasing the output torque of the motor 300 and improving the efficiency of the motor 300.

[0145] It should be noted that the above explanations of the implementation methods and beneficial effects of the motor rotor 100 and the motor stator 200 are also applicable to the motor 300, compressor and household appliances of the implementation methods of the present invention, and will not be elaborated here to avoid redundancy.

[0146] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0147] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A motor rotor, characterized in that: The invention comprises a rotor punching sheet, a first permanent magnet and a second permanent magnet, wherein the first permanent magnet and the second permanent magnet have different shapes; The rotor punching sheet is formed with a first groove and a second groove, the first groove and the second groove are arranged at intervals, a magnetic isolation bridge is arranged between the first groove and the second groove, and the first groove is provided with a notch on a side away from the center of the rotor punching sheet; The shape of the first groove matches the shape of the first permanent magnet, and the first permanent magnet is accommodated in the first groove. The shape of the second groove matches the shape of the second permanent magnet, and the second permanent magnet is accommodated in the second groove.

2. The motor rotor according to claim 1, characterized in that: The magnetic isolation bridge extends in the radial direction of the rotor punching sheet, and the width of the magnetic isolation bridge in the circumferential direction of the rotor punching sheet is greater than or equal to 0.2 mm, and / or; A first through hole is formed at the center of the rotor punching sheet, and a distance between a periphery of the first through hole and an edge of the second groove is greater than or equal to 1 mm.

3. The motor rotor according to claim 1, characterized in that: The first slot includes a first region and a second region connected to each other, the width of the first region is constant, and the width of the second region gradually decreases in a direction away from the first region, the first permanent magnet includes a first part and a second part connected to each other, the shape of the first part is adapted to the shape of the first region, and the shape of the second part is adapted to the shape of the second region; Along the radial direction of the rotor punching, the first region is far away from the center of the rotor punching, the second region is close to the center of the rotor punching, and the second groove is close to the center of the rotor punching.

4. The motor rotor according to claim 3, characterized in that: Along the radial direction of the rotor punching sheet, a ratio of the thickness of the first portion to the overall thickness of the first permanent magnet is in a range of [0.25, 0.85], and / or; Along the circumferential direction of the rotor punching sheet, a ratio of the minimum width of the second portion to the width of the first portion is in a range of [0.1, 0.9], and / or; The ratio of the width of the notch to the width of the first portion is in the range of [0.3, 0.9], and / or; The ratio of the width of the first portion to the overall thickness of the first permanent magnet is in the range of [0.5, 1.3].

5. The motor rotor according to claim 3, characterized in that: The second groove is in a rectangular shape.

6. The motor rotor according to claim 5, characterized in that: A value range of a ratio of the thickness of the second permanent magnet to the width of the second permanent magnet is [0.4, 1].

7. The motor rotor according to claim 1, characterized in that: The magnetizing direction of the first permanent magnet is along the radial direction of the rotor punching sheet, and the magnetizing direction of the second permanent magnet is along the circumferential direction of the rotor punching sheet.

8. The motor rotor according to claim 1, characterized in that: A first fixing hole is provided between the plurality of the first grooves, and a first fastener is passed through the first fixing holes on the plurality of the rotor punchings to fix and connect the plurality of the rotor punchings.

9. The motor rotor according to any one of claims 1 to 8, characterized in that: The first permanent magnet and the second permanent magnet are ferrite permanent magnets.

10. A motor stator, characterized in that: The invention comprises a stator punching sheet, wherein a mounting hole is provided at the center of the stator punching sheet, wherein the mounting hole is used to accommodate the motor rotor, and the stator punching sheet satisfies at least one of the following conditions: The stator punching sheet comprises a stator yoke and a plurality of stator teeth, wherein the plurality of stator teeth are evenly arranged on the stator yoke and extend toward the center of the stator punching sheet along the radial direction of the mounting hole, and a stator slot is formed between every two stator teeth; The width of the stator yoke at its narrowest point is greater than or equal to 2 mm; The ratio of the width of the narrowest part of the stator yoke to the width of the stator tooth is in the range of [0.2, 0.5]; Along the circumference of the mounting hole, the stator tooth portion is formed with a tooth shoe portion, and the minimum width of the tooth shoe portion is greater than or equal to 0.7 mm; The depth of the stator slots ranges from [5 mm, 12 mm].

11. A motor, characterized in that: It comprises the motor rotor according to any one of claims 1 to 9, and / or the motor stator according to claim 10.

12. A compressor, characterized in that: Includes the motor as claimed in claim 11.

13. A household appliance, characterized in that: Comprising the compressor as claimed in claim 12.

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