Motor, compressor and air conditioning system

Abstract

The utility model provides a motor, a compressor and an air conditioning system, the motor comprises a stator and a rotor, and the rotor comprises a plurality of permanent magnets; the rotor iron core is provided with a plurality of mounting grooves, the plurality of mounting grooves are arranged at intervals along the circumferential direction of the rotor iron core, the permanent magnets are arranged in the mounting grooves to form magnetic poles, one side, deviating from the axis of the rotor iron core, of at least part of the mounting grooves is provided with first slits and second slits, and the first slits and the second slits are arranged at intervals along the circumferential direction of the rotor iron core; on a cross section perpendicular to the axis of the rotor core, the contour line of the first slit is recessed relative to the corresponding mounting groove in the direction away from the mounting groove, so that the contour line of the first slit is in a groove shape, and the second slit is in a straight strip shape. According to the motor provided by the utility model, under the combined action of the first slit and the second slit, air gap flux density harmonics can be improved, the noise reduction effect can be optimized, and the performance of the motor can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a motor, a compressor and an air-conditioning system. Background Art

[0002] At present, with the rapid development of economy and the improvement of people's living standards, miniaturization, high efficiency and low noise are increasingly becoming people's demands in the field of compressors. The air gap magnetic flux harmonics of the motor in the related technology cause the vibration of the motor to be larger and the energy efficiency of the whole machine is low. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology.

[0004] To this end, a first aspect of the utility model provides a motor.

[0005] The second aspect of the utility model also provides a compressor.

[0006] The third aspect of the utility model also provides an air conditioning system.

[0007] In view of this, the first aspect of the utility model proposes a motor, including a stator and a rotor, the rotor including: a plurality of permanent magnets; a rotor core, the rotor core is provided with a plurality of mounting grooves, the plurality of mounting grooves are arranged at intervals along the circumference of the rotor core, the permanent magnets are arranged in the mounting grooves to form magnetic poles, at least part of the mounting grooves are provided with a first slit and a second slit on the side away from the axis of the rotor core, the first slit and the second slit are arranged at intervals along the circumference of the rotor core; on a cross section perpendicular to the axis of the rotor core, the contour line of the first slit is recessed relative to the corresponding mounting groove in a direction away from the mounting groove, so that the contour line of the first slit is in the shape of a groove, and the contour line of the second slit is in the shape of a straight bar.

[0008] The motor provided by the utility model includes a stator and a rotor, the rotor includes a plurality of permanent magnets and a rotor core, a plurality of mounting grooves are provided on the rotor core, the plurality of mounting grooves are arranged at intervals along the circumference of the rotor core, and the permanent magnets are arranged in the mounting grooves to form magnetic poles. A first slit and a second slit are provided on the side of at least part of the mounting grooves away from the axis of the rotor core to reduce the influence of the motor armature magnetic field on the main magnetic field of the rotor. Among them, on the cross section perpendicular to the axis of the rotor core, the contour line of the first slit is recessed in the direction away from the mounting groove relative to the corresponding mounting groove, so that the contour line of the first slit is in the shape of a groove, and the second slit is in the shape of a strip. Under the joint action of the first slit and the second slit, the air gap magnetic density harmonics can be improved, the noise reduction effect can be optimized, and the performance of the motor can be improved.

[0009] The motor provided by the utility model may also have the following additional technical features:

[0010] In some technical schemes, optionally, the first slit includes: a first slot segment, a second slot segment and a third slot segment, the first slot segment and the second slot segment are located at both ends of the third slot segment and are connected to the third slot segment; the groove-shaped first slit includes an opening, the opening is arranged opposite to the third slot segment, and the opening is arranged toward the corresponding installation slot.

[0011] In this technical solution, the first slit includes a first slot segment, a second slot segment and a third slot segment that are connected to each other. The first slot segment and the second slot segment are located at both ends of the third slot segment, and on a cross section perpendicular to the axis of the rotor core, the contour lines of the first slot segment, the contour lines of the second slot segment and the contour lines of the third slot segment enclose a groove shape, and the opening of the groove-shaped first slit is arranged toward the corresponding mounting slot, thereby improving the air gap magnetic flux harmonics, optimizing the noise reduction effect, and improving the performance of the motor.

[0012] In some technical schemes, optionally, the distance between one end of the second slot segment away from the third slot segment and the corresponding installation slot is d1, and the distance between one end of the first slot segment away from the third slot segment and the corresponding installation slot is d2; d1 and d2 satisfy the following formula: 0.2≤d1÷d2≤0.4.

[0013] In this technical solution, the distance between one end of the second slot segment away from the third slot segment and the wall of the corresponding mounting slot close to the second slot segment is d1, and the distance between one end of the first slot segment away from the third slot segment and the wall of the corresponding mounting slot close to the first slot segment is d2. The ratio of d1 to d2 is greater than or equal to 0.2 and less than or equal to 0.4, so that the distance between the first slot segment and the permanent magnet is different from the distance between the second slot segment and the permanent magnet, thereby adjusting the air gap magnetic density harmonics, achieving the effect of improving the air gap magnetic density harmonics and reducing noise, and improving the performance of the motor.

[0014] In some technical solutions, optionally, the mounting slot includes two opposite ends along the circumference of the rotor core, the first slit is arranged near one of the two ends of the mounting slot, and the second slot section is near the end of the corresponding mounting slot relative to the first slot section.

[0015] In this technical solution, along the circumference of the rotor core, the first slit is arranged close to one end of the mounting slot, and relative to the first slot segment, the second slot segment is close to the end of the corresponding mounting slot, thereby better improving the air gap magnetic flux harmonics and improving the vibration of the motor.

[0016] In some technical solutions, optionally, a distance between a side of the third slot segment away from the axis of the rotor core and an outer side wall of the rotor core is d3, and d3 satisfies the following relationship: 0.4mm≤d3≤0.5mm.

[0017] In this technical solution, the distance between the third slot segment and the outer wall of the rotor core on the side away from the axis of the rotor core is d3. If d3 is too small, it is not conducive to manufacturing, and if d3 is too large, it affects the improvement effect of the air gap magnetic density harmonics. Therefore, setting d3 between 0.4 mm and 0.5 mm can not only meet the process requirements, but also ensure the improvement effect of the air gap magnetic density harmonics.

[0018] In some technical solutions, optionally, the number of the first slits is N1, the number of pole pairs of the rotor is P, and the ratio of N1 to P is equal to 1 or equal to 2.

[0019] In this technical solution, the ratio of the number of first slits to the number of pole pairs of the rotor is 1 or 2, so that a first slit is provided on the side of any installation slot facing away from the rotor core, or at least half of the installation slots are provided on the side facing away from the rotor core, so as to optimize the air gap magnetic flux harmonics and improve the motor performance.

[0020] In some technical solutions, optionally, the inner wall surface of the first slit includes a curved surface and / or a flat surface.

[0021] In this technical solution, the inner wall surface of the first slit may include a curved surface, so that the corner of the first slit has a smooth transition, and the inner wall surface of the first slit may also include a flat surface to facilitate the manufacture of the first slit.

[0022] In some technical solutions, optionally, there are multiple second slits, and at least two of the second slits have different lengths.

[0023] In this technical solution, there are multiple second slits, and at least two second slits have different lengths, that is, the multiple second slits in strip shape have at least two sizes to adapt to the shape of the magnetic field lines and further optimize the air gap magnetic density harmonics.

[0024] In some technical solutions, optionally, a first slit and a plurality of second slits are provided on one side of any installation slot that is away from the axis of the rotor core.

[0025] In this technical solution, a first slit and multiple second slits are provided on the side of any mounting slot facing away from the rotor core, so that the first slit and the second slit cooperate with each other to optimize the air gap magnetic density harmonics, further improve the vibration of the motor, and achieve the effect of improving the motor performance.

[0026] In some technical solutions, optionally, multiple permanent magnets are radially arranged from the center of the rotor core to the outer wall of the rotor core; or the installation groove is V-shaped, and the V-shaped installation groove is arranged away from the axis of the rotor core; or the installation groove is in a straight line.

[0027] In this technical solution, the permanent magnets can be distributed on the rotor core in a radial shape from the center of the rotor core to the outer wall of the rotor core. When the mounting groove is V-shaped, the permanent magnets in the mounting groove are spliced ​​into a V shape. When the mounting groove is in a straight shape, the permanent magnets are arranged in the mounting groove in a straight shape.

[0028] In some technical schemes, optionally, the stator includes stator slots, and the number of stator slots is N2; in a cross section perpendicular to the axis of the rotor core, the minimum distance between the first slit and the adjacent second slit along the circumference of the rotor core is d4, the minimum distance between the opposite side walls of the groove-shaped first slit is d5, and the number of pole pairs of the rotor is P; d4, d5, P and N2 satisfy the following formula: 0.25≤d4÷d5×sin(π×P÷N2)≤0.7.

[0029] In this technical solution, the motor also includes a stator, and the rotor is located inside the stator to realize the rotation of the rotor. Among them, in the cross section perpendicular to the axis of the rotor core, the minimum distance between the first slit and the adjacent second slit is d4, and the minimum distance between the two side walls of the groove shape enclosed by the first slit is d5. d4, d5, the number of pole pairs P of the rotor and the number of stator slots N2 satisfy the following formula: 0.25≤d4÷d5×sin(π×P÷N2)≤0.7, so as to achieve the effect of optimizing the air gap magnetic density harmonics, improve the vibration problem of the motor, and enhance the performance of the motor. Among them, π is equal to 180°.

[0030] According to a second aspect of the present invention, a compressor is also proposed, comprising: a motor as proposed in any technical solution of the first aspect above.

[0031] The compressor provided in the second aspect of the utility model comprises the motor proposed in any of the above technical solutions and therefore has all the beneficial effects of the motor.

[0032] According to a third aspect of the present utility model, an air conditioning system is also proposed, comprising: a motor or a compressor as proposed in any of the above technical solutions.

[0033] The air conditioning system provided in the third aspect of the utility model comprises the motor or compressor proposed in any of the above technical solutions, and therefore has all the beneficial effects of the motor or compressor.

[0034] Additional aspects and advantages of the present invention will become apparent in the following description or will be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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:

[0036] Figure 1 One of the structural schematic diagrams of a motor according to an embodiment of the utility model is shown;

[0037] Figure 2 One of the partial structural schematic diagrams of the rotor of one embodiment of the utility model is shown;

[0038] Figure 3 A second schematic diagram of a partial structure of a rotor according to an embodiment of the utility model is shown;

[0039] Figure 4 A second structural schematic diagram of a motor according to an embodiment of the utility model is shown;

[0040] Figure 5 The back electromotive force waveform diagram of the motor of one embodiment of the utility model is shown;

[0041] Figure 6 The figure shows a torque waveform diagram of a motor according to an embodiment of the present utility model.

[0042] in, Figures 1 to 4 The corresponding relationship between the reference numerals and the component names is as follows:

[0043] 1 rotor, 10 permanent magnet, 11 rotor core, 12 mounting slot, 130 first slot, 131 first slot section, 132 second slot section, 133 third slot section, 135 opening, 136 second slot, 2 stator, 20 stator slot. DETAILED DESCRIPTION

[0044] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0045] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0046] Refer to the following Figures 1 to 6 The present invention describes a motor, a compressor and an air-conditioning system according to some embodiments of the present invention.

[0047] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, according to an embodiment of the utility model, the utility model provides a motor, including a rotor 1 and a stator 2, the rotor 1 including: a plurality of permanent magnets 10; a rotor core 11, the rotor core 11 is provided with a plurality of mounting grooves 12, the plurality of mounting grooves 12 are arranged at intervals along the circumference of the rotor core 11, the permanent magnets 10 are arranged in the mounting grooves 12 to form magnetic poles, at least part of the mounting grooves 12 are provided with a first slit 130 and a second slit 136 on the side away from the axis of the rotor core 11, the first slit 130 and the second slit 136 are arranged at intervals along the circumference of the rotor core 11; on a cross section perpendicular to the axis of the rotor core 11, the contour line of the first slit 130 is recessed relative to the corresponding mounting groove 12 in a direction away from the mounting groove 12, so that the contour line of the first slit 130 is in a groove shape, and the second slit 136 is in a straight bar shape.

[0048] The motor provided by the utility model comprises a rotor 1 and a stator 2, wherein the rotor 1 comprises a plurality of permanent magnets 10 and a rotor core 11, wherein the rotor core 11 is provided with a plurality of mounting grooves 12, wherein the plurality of mounting grooves 12 are arranged at intervals along the circumference of the rotor core 11, and the permanent magnets 10 are arranged in the mounting grooves 12 to form magnetic poles. At least part of the mounting grooves 12 are provided with two kinds of slits, namely, a first slit 130 and a second slit 136, on the side away from the axis of the rotor core 11, so as to reduce the influence of the armature magnetic field of the motor on the main magnetic field of the rotor 1. Among them, on the cross section perpendicular to the axis of the rotor core 11, the contour line of the first slit 130 is concave relative to the corresponding mounting groove 12 in the direction away from the mounting groove 12, so that the contour line of the first slit 130 is in the shape of a groove, and the second slit 136 is in the shape of a strip, and under the joint action of the first slit 130 and the second slit 136, the air gap magnetic density harmonics can be improved, the noise reduction effect can be optimized, and the performance of the motor can be improved.

[0049] like Figure 2 and Figure 3 As shown, in some embodiments, optionally, the first slit 130 includes: a first slot segment 131, a second slot segment 132 and a third slot segment 133, the first slot segment 131 and the second slot segment 132 are located at both ends of the third slot segment 133 and are connected to the third slot segment 133; the groove-shaped first slit 130 includes an opening 135, the opening 135 is arranged opposite to the third slot segment 133, and the opening 135 is arranged toward the corresponding mounting slot 12.

[0050] In this embodiment, the first slit 130 includes a first slot segment 131, a second slot segment 132 and a third slot segment 133 which are connected to each other. The first slot segment 131 and the second slot segment 132 are located at both ends of the third slot segment 133, and on a cross section perpendicular to the axis of the rotor core 11, the contour lines of the first slot segment 131, the contour lines of the second slot segment 132 and the contour lines of the third slot segment 133 are enclosed in a groove shape, and the opening 135 of the groove-shaped first slit 130 is arranged toward the corresponding mounting slot 12, thereby improving the air gap magnetic flux harmonics, optimizing the noise reduction effect, and improving the performance of the motor.

[0051] Optionally, the first slot segment 131 and the second slot segment 132 are arranged to be inclined toward one side of the corresponding installation slot 12 relative to the third slot segment 133 .

[0052] like Figure 2 and Figure 3 As shown, optionally, the plurality of first slits 130 are arranged in one-to-one correspondence with the plurality of mounting grooves 12 .

[0053] In some embodiments, optionally, the distance between one end of the second slot segment 132 away from the third slot segment 133 and the corresponding mounting slot 12 is d1, and the distance between one end of the first slot segment 131 away from the third slot segment 133 and the corresponding mounting slot 12 is d2; d1 and d2 satisfy the following formula: 0.2≤d1÷d2≤0.4.

[0054] In this embodiment, the distance between one end of the second slot segment 132 away from the third slot segment 133 and the wall surface of the corresponding mounting slot 12 close to the second slot segment 132 is d1, and the distance between one end of the first slot segment 131 away from the third slot segment 133 and the wall surface of the corresponding mounting slot 12 close to the first slot segment 131 is d2. The ratio of d1 to d2 is greater than or equal to 0.2 and less than or equal to 0.4, so that the distance between the first slot segment 131 and the permanent magnet 10 is different from the distance between the second slot segment 132 and the permanent magnet 10, thereby adjusting the air gap magnetic flux harmonics, achieving the effect of improving the air gap magnetic flux harmonics and reducing noise, and improving the performance of the motor.

[0055] It can be understood that d1 is smaller than d2.

[0056] Optionally, d1 / d2 is equal to any value among 0.2, 0.22, 0.25, 0.28, 0.3, 0.32, 0.35, 0.38, and 0.4.

[0057] In some embodiments, optionally, the mounting slot 12 is disposed at opposite ends of the circumference of the rotor core 11 , the first slit 130 is disposed close to one of the ends of the mounting slot 12 , and the second slot segment 132 is disposed close to the corresponding end of the mounting slot 12 relative to the first slot segment 131 .

[0058] In this embodiment, along the circumference of the rotor core 11, the first slit 130 is arranged close to one end of the mounting slot 12, and relative to the first slot segment 131, the second slot segment 132 is close to the end of the corresponding mounting slot 12, thereby better improving the air gap magnetic flux harmonics and improving the vibration of the motor.

[0059] In some embodiments, optionally, a distance between the third slot segment 133 and the outer side wall of the rotor core 11 on a side away from the axis of the rotor core 11 is d3, and d3 satisfies the following relationship: 0.4 mm≤d3≤0.5 mm.

[0060] In this embodiment, the distance between the third slot section 133 and the outer wall of the rotor core 11 is d3, and if d3 is too small, it is not conducive to manufacturing, and if d3 is too large, it will affect the improvement effect of air gap magnetic flux harmonics. Therefore, setting d3 between 0.4 mm and 0.5 mm can not only meet the process requirements, but also ensure the improvement effect of air gap magnetic flux harmonics.

[0061] Optionally, d3 is any value among 0.41 mm, 0.42 mm, 0.43 mm, 0.44 mm, 0.45 mm, 0.46 mm, 0.47 mm, 0.48 mm, and 0.49 mm.

[0062] In some embodiments, optionally, the number of the first slits 130 is N1, the number of pole pairs of the rotor 1 is P, and the ratio of N1 to P is equal to 1 or equal to 2.

[0063] In this embodiment, the ratio of the number of first slits 130 to the number of pole pairs of the rotor 1 is 1 or 2, so that the first slit 130 is provided on the side of any mounting slot 12 facing away from the rotor core 11, or at least half of the mounting slots 12 are provided with the first slit 130 on the side facing away from the rotor core 11, so as to optimize the air gap magnetic flux harmonics and improve the motor performance.

[0064] Optionally, when the ratio of the number of the first slits 130 to the number of pole pairs of the rotor 1 is 2, a first slit 130 is provided on a side of each mounting slot 12 facing away from the axis of the rotor core 11 .

[0065] Optionally, the plurality of first slits 130 are evenly distributed along the axial direction of the rotor core 11 .

[0066] In some embodiments, optionally, the inner wall surface of the first slit 130 includes a curved surface and / or a flat surface.

[0067] In this embodiment, the inner wall surface of the first slit 130 may include a curved surface so that the corner of the first slit 130 has a smooth transition. The inner wall surface of the first slit 130 may also include a flat surface to facilitate the manufacture of the first slit 130 .

[0068] like Figure 2 As shown, in some embodiments, optionally, there are multiple second slits 136 , and at least two second slits 136 have different lengths.

[0069] In this embodiment, there are multiple second slits 136, and at least two second slits 136 have different lengths, that is, the multiple second slits 136 in strip shape have at least two sizes to adapt to the shape of the magnetic field lines and further optimize the air gap magnetic density harmonics.

[0070] like Figure 2 and Figure 3 As shown, in some embodiments, optionally, a first slit 130 and a plurality of second slits 136 are provided on one side of any mounting slot 12 away from the axis of the rotor core 11 .

[0071] In this embodiment, a first slit 130 and a plurality of second slits 136 are provided on the side of any mounting slot 12 facing away from the rotor core 11, so that the first slit 130 and the second slit 136 cooperate with each other to optimize the air gap magnetic density harmonics, further improve the vibration of the motor, and achieve the effect of improving the motor performance.

[0072] In some embodiments, optionally, multiple permanent magnets 10 are radially arranged from the center of the rotor core 11 to the outer wall of the rotor core 11; or the installation groove 12 is V-shaped, and the V-shaped installation groove 12 is arranged away from the axis of the rotor core 11; or the installation groove 12 is in a straight line.

[0073] In this embodiment, the permanent magnets 10 may be distributed on the rotor core 11 in a radial shape from the center of the rotor core 11 to the outer side wall of the rotor core 11. When the mounting groove 12 is in a V-shape, the permanent magnets 10 in the mounting groove 12 are spliced ​​in a V-shape. When the mounting groove 12 is in a straight line shape, the permanent magnets 10 are arranged in the mounting groove 12 in a straight line shape.

[0074] In some embodiments, optionally, the stator 2 includes stator slots 20, and the number of stator slots 20 is N2; in a cross section perpendicular to the axis of the rotor core 11, the minimum distance between the first slit 130 and the adjacent second slit 136 along the circumference of the rotor core 11 is d4, the minimum distance between the opposite side walls of the groove-shaped first slit 130 is d5, and the number of pole pairs of the rotor 1 is P; d4, d5, P and N2 satisfy the following formula: 0.25≤d4÷d5×sin(π×P÷N2)≤0.7.

[0075] In this embodiment, the motor further includes a stator 2, and the rotor 1 is located inside the stator 2 to realize the rotation of the rotor 1. In the cross section perpendicular to the axis of the rotor core 11, the minimum distance between the first slit 130 and the adjacent second slit 136 is d4, and the minimum distance between the two opposite side walls of the groove shape enclosed by the first slit 130 is d5. d4, d5, the number of pole pairs P of the rotor 1 and the number N2 of the stator slots 20 satisfy the following formula: 0.25≤d4÷d5×sin(π×P÷N2)≤0.7, so as to achieve the effect of optimizing the air gap magnetic density harmonics, improve the vibration problem of the motor, and enhance the performance of the motor.

[0076] Optionally, d4÷d5×sin(π×P÷N2) is equal to any value among 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, and 0.7.

[0077] Specifically, the first slit 130 includes a first slot segment 131, a second slot segment 132 and a third slot segment 133. The first slot segment 131 and the second slot segment 132 are located at both ends of the third slot segment 133 and are connected to the third slot segment 133. On a cross section perpendicular to the axis of the rotor core 11, the contour lines of the first slot segment 131, the contour lines of the second slot segment 132 and the contour lines of the third slot segment 133 enclose a groove shape. The groove-shaped first slit 130 includes an opening 135, which is arranged opposite to the third slot segment 133 and is arranged toward the corresponding mounting slot 12.

[0078] The two opposite side walls of the groove-shaped first slit 130 are the wall surface of the first groove section 131 facing the second groove section 132 , and the wall surface of the second groove section 132 facing the first groove section 131 .

[0079] Specifically, the end of the first slot section 131 that faces the wall of the second slot section 132 and is connected to the third slot section 133 is the first end, the end of the second slot section 132 that faces the wall of the first slot section 131 and is connected to the third slot section 133 is the second end, and the minimum distance from the first end to the second end is d5.

[0080] Optionally, a winding is provided on the stator 2 , and the winding is wound around the teeth of the stator 2 . When the winding is energized, a magnetic field is generated, thereby realizing the rotation of the rotor 1 .

[0081] Specifically, Figure 5 and Figure 6 As shown, Figure 5 It is the back EMF waveform under no-load phase, and phase A, phase B, and phase C are the three phases of the motor. Figure 6The torque waveform under load is shown. According to the embodiment proposed in the present application, while ensuring that the effective value of the back electromotive force remains basically unchanged and the output torque remains unchanged, the iron loss of the motor is reduced by 5% to 10%, and the single-unit efficiency of the motor can be improved by 0.2% to 0.3%.

[0082] According to an embodiment of the present invention, a compressor is also proposed, comprising: a motor as proposed in any embodiment of the first aspect above.

[0083] The compressor provided by the utility model comprises the motor proposed in any of the above embodiments and therefore has all the beneficial effects of the motor.

[0084] According to an embodiment of the present utility model, an air conditioning system is also proposed, comprising: a machine or a compressor as proposed in any of the above embodiments.

[0085] The air conditioning system provided by the utility model comprises the motor or compressor proposed in any of the above embodiments, and therefore has all the beneficial effects of the motor or compressor.

[0086] In a specific application, the permanent magnet motor is composed of a rotor 1 and a stator 2 , and the rotor 1 is located inside the stator 2 .

[0087] The rotor 1 is composed of a rotor core 11 and a magnet (e.g., a permanent magnet 10). The rotor core 11 is formed by stacking silicon steel sheets of a certain size in the axial direction, and the magnet is located in a magnet slot (e.g., a mounting slot 12) of the rotor core 11. The rotor core 11 includes a plurality of slits, which are composed of two shapes, namely, a straight bar shape (e.g., the second slit 136) and a groove shape (e.g., the first slit 130).

[0088] The stator 2 is composed of a stator core and an armature winding.

[0089] The number of pole pairs of the rotor 1 is P, the number of stator slots is N2, the shortest distance between the groove-shaped slots and adjacent slots is d4, the shortest width of the groove-shaped slots is d5, and 0.25≤d4÷d5×sin(π×P÷N2)≤0.7.

[0090] Optionally, the distances between the two arcs of the groove-shaped slit close to the magnet and the magnet are d1 and d2 respectively, satisfying 0.2≤d1 / d2≤0.4.

[0091] Optionally, the shortest distance d3 between the bottom edge of the groove-shaped slit close to the air gap and the outer circle of the rotor 1 satisfies: 0.4 mm≤d3≤0.5 mm.

[0092] Optionally, the number N1 of the groove-shaped slits satisfies: the value of N1 / P can be 1 or 2.

[0093] Optionally, the edges of the groove-shaped slit may be in the shape of a straight line or an arc.

[0094] Optionally, the rotor 1 is a permanent magnet rotor structure, and the permanent magnets on the rotor 1 may be distributed in a straight line shape, a V shape, or a spoke structure.

[0095] Optionally, an air conditioner compressor comprises the above-mentioned stator core, armature winding, rotor and a motor formed thereof, and the motor is applied to household appliances such as air conditioner compressors.

[0096] In the present invention, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0097] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. 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 can be combined in any one or more embodiments or examples in a suitable manner.

[0098] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A motor, characterized in that: The invention comprises a stator and a rotor, wherein the rotor comprises: a plurality of permanent magnets; A rotor core, wherein the rotor core is provided with a plurality of mounting grooves, the plurality of mounting grooves are arranged at intervals along the circumferential direction of the rotor core, the permanent magnets are arranged in the mounting grooves to form magnetic poles, at least a portion of the mounting grooves are provided with a first slit and a second slit on a side away from the axis of the rotor core, the first slit and the second slit are arranged at intervals along the circumferential direction of the rotor core; On a cross section perpendicular to the axis of the rotor core, the contour line of the first slit is recessed relative to the corresponding mounting groove in a direction away from the mounting groove, so that the contour line of the first slit is in a groove shape and the second slit is in a straight bar shape.

2. The motor according to claim 1, characterized in that The first slit comprises: A first slot section, a second slot section and a third slot section, wherein the first slot section and the second slot section are located at two ends of the third slot section and are connected to the third slot section; The first groove-shaped slit has an opening, the opening is arranged opposite to the third groove section, and the opening is arranged toward the corresponding mounting groove.

3. The motor according to claim 2, characterized in that The distance between one end of the second slot section away from the third slot section and the corresponding mounting slot is d1; The distance between one end of the first slot section away from the third slot section and the corresponding mounting slot is d2, and d1 and d2 satisfy the following formula: 0.2≤d1÷d2≤0.

4.

4. The motor according to claim 3, characterized in that The mounting slot includes two opposite ends along the circumferential direction of the rotor core, the first slit is arranged close to one of the two ends of the mounting slot, and the second slot section is close to the corresponding end of the mounting slot relative to the first slot section.

5. The motor according to claim 2, characterized in that: The distance between the third slot segment, which is away from the axis of the rotor core, and the outer side wall of the rotor core is d3, and d3 satisfies the following relationship: 0.4mm≤d3≤0.5mm.

6. The electric machine according to any one of claims 1 to 5, characterized in that The number of the first slits is N1, the number of pole pairs of the rotor is P, and the ratio of N1 to P is equal to 1 or equal to 2.

7. The electric machine according to any one of claims 1 to 5, characterized in that The inner wall surface of the first slit includes a curved surface and / or a flat surface.

8. The electric machine according to any one of claims 1 to 5, characterized in that There are multiple second slits, and at least two of the second slits have different lengths; and / or One side of any of the mounting grooves that is away from the axis of the rotor core is provided with one of the first slits and a plurality of the second slits.

9. The electric machine according to any one of claims 1 to 5, characterized in that The plurality of permanent magnets are radially arranged from the center of the rotor core to the outer side wall of the rotor core; or The mounting groove is V-shaped, and the V-shaped mounting groove is arranged away from the axis of the rotor core; or The mounting groove is in a straight line shape.

10. The electric machine according to any one of claims 1 to 5, characterized in that The stator comprises stator slots, and the number of the stator slots is N2; In a cross section perpendicular to the axis of the rotor core, the minimum distance between the first slit and the adjacent second slit is d4, the minimum distance between two opposite side walls of the groove-shaped first slit is d5, and the number of pole pairs of the rotor is P; d4, d5, P and N2 satisfy the following formula: 0.25≤d4÷d5×sin(π×P÷N2)≤0.

7.

11. A compressor, characterized in that: include: A motor as claimed in any one of claims 1 to 10.

12. An air conditioning system, characterized in that: include: An electric machine as claimed in any one of claims 1 to 10; or The compressor of claim 11.

Images