Rotor assembly, motor, compressor and refrigeration equipment

Abstract

The utility model discloses a rotor assembly, a motor, a compressor and refrigeration equipment, the rotor assembly comprises a rotor iron core and magnetic steel, the rotor iron core is provided with a plurality of magnet grooves along the circumferential direction, each magnet groove comprises a middle section, and an inner side section and an outer side section which are respectively arranged at the inner side and the outer side of the middle section; the extension directions of the outer side section and the inner side section are the same as the radial direction of the rotor core; the magnetic steel comprises a main body, and a first extension part and a second extension part which are respectively connected to two ends of the main body in the length direction, the magnetic steel is mounted in the magnet groove, and the first extension part, the main body and the second extension part are respectively positioned in the outer side section, the middle section and the inner side section. According to the technical scheme, the usage amount of magnetic steel under the same volume of the motor can be increased, and the power density of the motor is improved; the cost of the magnetic steel can be reduced, the demagnetization of the magnetic steel is improved, and the comprehensive cost of the motor is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a rotor assembly, a motor, a compressor and a refrigeration device. Background Art

[0002] At present, the structure of the inserted rotor of the brushless permanent magnet motor mostly adopts rectangular magnets, and the shape of the magnets is relatively simple. Due to the complex working environment of the motor and special usage requirements, there are some necessary performance requirements, such as high torque density, high power density, adaptability to complex operating conditions and high temperature operating environment, etc. These require the magnets of the electronic rotor to have high magnetic properties. Utility Model Content

[0003] The main purpose of the utility model is to provide a rotor assembly, which aims to increase the use of magnetic steel under the same volume of the motor and improve the power density of the motor; it can reduce the cost of the magnetic steel, improve the demagnetization of the magnetic steel, and thus reduce the overall cost of the motor.

[0004] In order to achieve the above object, the utility model provides a rotor assembly, which comprises:

[0005] A rotor core, wherein a plurality of magnet slots are provided along a circumferential direction, wherein the magnet slots include a middle section and an inner section and an outer section respectively located inside and outside the middle section, wherein the extension direction of the outer section and the inner section is the same as the radial direction of the rotor core; and the extension direction of the middle section intersects the radial direction of the rotor core at a preset angle; and

[0006] A magnetic steel, the magnetic steel comprising a main body and a first extension portion and a second extension portion respectively connected to both ends of the main body in a length direction, wherein the extension directions of the first extension portion and the second extension portion are parallel and both form the preset angle with the extension direction of the main body;

[0007] The magnetic steel is installed in the magnet slot, and the first extension portion, the main body, and the second extension portion are respectively located in the outer section, the middle section, and the inner section.

[0008] Optionally, in a cross section of the magnetic steel perpendicular to the axial direction, a cross-sectional area of ​​the first extension portion is A, a cross-sectional area of ​​the main body is B, and a cross-sectional area of ​​the second extension portion is C, and B>C≥A.

[0009] Optionally, the lengths of two sides of the cross section of the first extension portion are H1 and H3 respectively, and the lengths of two sides of the cross section of the second extension portion are H2 and H4 respectively, wherein H3>H1, H2>H4, and H3 / H1≤H2 / H4.

[0010] Optionally, the width of the cross section of the first extension portion is W1, the width of the cross section of the second extension portion is W2, the distance between the midpoint of the width of the first extension portion and the midpoint of the width of the second extension portion is H6, and the length of the side of the cross section of the main body is H5;

[0011] The included angle between the side of the second extension portion having a length of H2 and the side of the main body is J4, and the included angle between the side of the second extension portion having a length of H4 and the side of the main body is J2;

[0012] The included angle between the side of the first extension portion having a length of H1 and the side of the main body is J3, and the included angle between the side of the first extension portion having a length of H3 and the side of the main body is J1;

[0013] The relationship is satisfied: abs(sin(J1))<(H1+H2+H5) / H6<H3 / H1<B / (A+C)<(H6 / W1).

[0014] Optionally, the magnetic steel is made of ferrite material.

[0015] Optionally, the rotor core comprises a plurality of core punchings stacked in phase, the plurality of magnet slots of the core punchings are connected in pairs near the inner edge of the rotor core to form a plurality of magnet slot groups, and the two magnet slots of the magnetic slot group are connected via a connecting slot.

[0016] Optionally, the core punching sheet has an inner ring portion and a plurality of fan-shaped portions located on the outer peripheral side of the inner ring portion, two of the fan-shaped portions spaced apart from each other are connected to the inner ring portion, the connecting groove is located between the two fan-shaped portions connected to the inner ring portion, a fixing spring sheet is provided on the inner ring portion, the fixing spring sheet is located in the connecting groove, and the fixing spring sheet extends radially along the outer periphery of the inner ring portion.

[0017] Optionally, the plurality of core punching sheets are externally open magnetic bridges, and the plurality of core punching sheets are provided with rivets on the inner and outer sides in the radial direction, and the plurality of core punching sheets are clamped and fixed by the rivets.

[0018] Optionally, in the rotor core of the outer open magnetic bridge formed by the plurality of core punchings, at least two core punchings of a fully closed outer magnetic bridge are provided in the middle axial portion.

[0019] Optionally, the bottom of the fixing spring sheet is higher than the notch of the magnet slot, and the height above the notch is 0.05mm-0.2mm.

[0020] Optionally, two magnets are provided in a magnet slot of the rotor core, and the two magnets are inserted into the magnet slot from two ends of the rotor core respectively; the fixed springs located at the two magnets in the magnet slot have opposite deformation directions.

[0021] Optionally, the magnet slot and the magnetic steel are gap-matched, and the gap range is 0.05mm≤D≤0.15mm.

[0022] Optionally, the rotor assembly further includes a mounting end plate, the mounting end plate fixes the rotor core, the thickness of the mounting end plate is W3, and the thickness of the rotor punching sheet is T, satisfying the relationship: (3*T)≤W3≤(H6 / W1).

[0023] Optionally, a preset angle formed by the first extension portion, the second extension portion and the extension direction of the main body is in a range of 5° to 60°.

[0024] The utility model also provides a motor, comprising a stator assembly and the rotor assembly as described above.

[0025] The utility model also provides a compressor, comprising the motor as described above.

[0026] The utility model also provides a refrigeration device, comprising the compressor as described above.

[0027] The technical solution of the utility model utilizes the outer section near the outer edge of the rotor and placed perpendicular to the outer edge of the rotor to improve the harmonic content of the air gap magnetic field when the motor is loaded and reduce the vibration and noise of the motor; compared with the rectangular radial magnetic steel structure, the utility model utilizes the middle section that is inclined in the radial direction relative to the rotor assembly to place more magnetic steel, thereby improving the power density of the motor, because compared with the magnetic steel of the rectangular structure, the magnetic flux area provided by the magnetic steel in the radiation direction of the entire rotor assembly is increased compared with the rectangular magnetic steel, the entire effective magnetic flux of the motor is increased, and the torque of the motor is increased within the same core length range of the motor, which can increase the use of magnetic steel under the same volume, thereby improving the output torque of the motor, and this solution can better improve the power density of the motor under the same speed comparison. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 An exploded view of an embodiment of a rotor assembly of the utility model;

[0030] Figure 2 for Figure 1 A schematic structural diagram of an embodiment of a middle rotor assembly;

[0031] Figure 3 for Figure 1 A schematic structural diagram of an embodiment of a medium magnetic steel;

[0032] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at AA in the middle;

[0033] Figure 5 for Figure 1 A schematic diagram of the structure of the phase misalignment of the core punching sheets;

[0034] Figure 6 for Figure 5 Schematic diagram of the structure of the middle iron core punching sheet;

[0035] Figure 7 for Figure 6 The enlarged view of point A in the middle;

[0036] Figure 8 It is a schematic diagram of the structure of the matching between the magnetic steel and the magnetic slot.

[0037] Description of Figure Numbers:

[0038]

[0039] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0043] At present, the structure of the inserted rotor of the brushless permanent magnet motor mostly adopts rectangular magnets, and the shape of the magnets is relatively simple. Due to the complex working environment of the motor and special usage requirements, there are some necessary performance requirements, such as high torque density, high power density, adaptability to complex operating conditions and high temperature operating environment, etc. These require the magnets of the electronic rotor to have high magnetic properties.

[0044] For this purpose, refer to Figure 1 and Figure 2 The utility model provides a rotor assembly 100 , comprising: a plurality of magnetic steels 150 and a rotor core 120 , wherein the rotor core 120 comprises a plurality of magnet slots 130 arranged along the circumferential direction, and one of the magnetic steels 150 is disposed in one of the magnet slots 130 .

[0045] Reference Figure 3 , Figure 4 In one embodiment of the utility model, the magnetic steel 150 includes a main body 151, a first extension portion 152, and a second extension portion 153. When installed, the magnetic steel 150 is placed in the magnet slot 130 of the rotor core 120 of the rotor assembly 100, the main body 151 is located in the middle section 131 of the magnet slot 130, the first extension portion 152 is located in the outer section 134, and the second extension portion 153 is located in the inner section 132. In addition, one end of the main body 151 close to the outer edge of the rotor deviates from the radial direction of the rotor assembly 100 from the rotation direction of the rotor assembly 100, that is, it intersects with the radial direction of the rotor assembly 100; in this way, the main body 151 can be placed in greater numbers than when arranged parallel to the radial direction. The first extension portion 152 is connected to the main body 151, close to the outer edge of the rotor assembly 100, and perpendicular to the radial direction of the rotor assembly 100, which helps to reduce the magnetic field distortion caused by the tilted placement of the main body 151.

[0046] Specifically, it is defined that the main body 151 has a first side surface 154 and a second side surface 155 in its own extension direction, the end of the first extension portion 152 is inclined toward the first side surface 154 of the main body 151 , and the end of the second extension portion 153 is inclined toward the second side surface 155 .

[0047] Taking the counterclockwise rotation of the rotor assembly 100 as an example, the main body 151 is tilted radially compared to the rotor assembly 100. Compared with the rectangular radial magnetic steel 150 structure, the utility model uses a structure in which more magnetic steel 150 is placed in the middle position of the magnetic steel 150 to improve the power density of the motor. This is because compared with the magnetic steel 150 with a rectangular structure, the magnetic flux area provided by the magnetic steel 150 in the entire rotor radiation direction is increased compared with the magnetic steel 150 with a rectangular structure, the entire effective magnetic flux of the motor is increased, and the torque of the motor is increased within the same core length range of the motor, which can increase the usage of the magnetic steel 150 under the same volume.

[0048] In addition, in order to reduce the distortion of the magnetic field, improve the operating performance of the motor, reduce energy loss, and reduce noise and vibration levels, the first extension portion 152 placed vertically close to the outer diameter is used to improve the harmonic content of the air gap magnetic field when the motor is loaded, reduce the tooth harmonics generated in the motor, and thus reduce the vibration and noise of the motor; and, the radially inclined main body 151 and the vertical first extension portion 152 relative to the rotor assembly 100 can reduce the hysteresis loss and eddy current loss of the rotor core 120, improve the efficiency of the motor, and improve the dynamic response characteristics of the motor, so that the motor has better performance during starting, acceleration and deceleration.

[0049] The technical solution of the present invention utilizes a first extension portion 152 placed near the outer edge of the rotor and perpendicular to the outer edge of the rotor to improve the harmonic content of the air gap magnetic field when the motor is loaded and reduce the vibration and noise of the motor; compared with the rectangular radiation type magnetic steel 150 structure, the present invention utilizes a main body 151 that is radially inclined relative to the rotor assembly 100, so that more magnetic steels 150 can be placed, thereby improving the power density of the motor, because compared with the magnetic steel 150 of a rectangular structure, the magnetic flux area provided by the magnetic steel 150 in the radiation direction of the entire rotor assembly 100 is increased compared with the rectangular magnetic steel 150, the entire effective magnetic flux of the motor is increased, and the torque of the motor is increased within the same core length range of the motor, which can increase the usage of the magnetic steel 150 under the same volume, thereby improving the output torque of the motor, and this solution can better improve the power density of the motor under the same speed comparison.

[0050] Furthermore, in order to reduce the distortion of the magnetic field, improve the operating performance of the motor, and reduce energy loss, the size of the first extension portion 152 is half the size of the main body 151 , for example, the longest side of the first extension portion 152 is half the side of the main body 151 .

[0051] In order to further improve the air gap magnetic field harmonic content when the motor is loaded and reduce the cogging harmonics generated in the motor, the magnetic steel 150 also includes a second extension portion 153 connected to the main body 151, and is close to the inner edge of the rotor assembly 100 relative to the first extension portion 152 and perpendicular to the radial direction of the rotor assembly 100. The existence of the second extension portion 153 can increase the strength of the magnetic field, because the magnetic field lines will pass through the rotor assembly 100 more concentratedly, thereby improving the magnetic performance.

[0052] Reference Figure 4 Specifically, the cross section of the magnetic steel 150 is a plane perpendicular to the axial direction of the magnetic steel 150, that is, a plane parallel to the surface of the core punching sheet 121, the cross-sectional area A of the first extension portion 152, that is, the area of ​​the area surrounded by the first extension portion is A, the cross-sectional area of ​​the main body 151 is B, and the cross-sectional area of ​​the second extension portion 153 is C, B>C≥A. The limitation of the cross-sectional area size of the first extension portion 152 (A), the main body 151 (B) and the second extension portion 153 (C) can ensure that when the magnetic steel 150 is placed in the rotor magnet slot 130, the magnetic field distribution is more uniform and stable, which is conducive to improving the efficiency of the motor. By controlling the size relationship of each section area, the magnetic resistance of the magnetic circuit can be reduced, the energy consumption of the motor can be reduced, and the performance of the motor can be improved. The main body 151 (B) plays an important role in assuming the main magnetic field effect. Its area is larger than the second extension part 153 (C), which helps to ensure the magnetic field strength and stability when the motor is working; and the area of ​​the second extension part 153 (C) is larger than the first extension part 152 (A), which can effectively control the concentration of the magnetic field, which is beneficial to improving the uniformity and stability of the magnetic field.

[0053] Specifically, in order to ensure that the magnet 150 can produce an ideal magnetic field distribution and stable working performance during the placement and movement of the rotor magnet slot 130, the lengths of the two side edges of the first extension portion 152 along the rotation direction are H1 and H3 respectively, and the lengths of the two side edges of the second extension portion 153 along the rotation direction are H2 and H4 respectively, wherein H3>H1, H2>H4, and H3 / H1≤H2 / H4. By limiting the relationship between H1, H2, H3, and H4, the magnet 150 can be better adapted to the rotor magnet slot 130 after installation, thereby optimizing the distribution of the magnetic field and improving the efficiency and performance of the motor. Reasonable design of the magnet 150 can reduce the magnetic resistance of the magnetic circuit, reduce the energy consumption of the motor, and improve energy utilization. By controlling the size ratio of the magnet 150, the noise and vibration of the motor during operation can be reduced, and the running stability and comfort of the motor can be improved.

[0054] Reference Figure 4Specifically, in order to improve the power density of the motor, which is conducive to improving the uniformity and stability of the magnetic field, the width of the first extension portion 152 is W1, the width of the second extension portion 153 is W2, the distance between the midpoint of the width of the first extension portion 152 and the midpoint of the width of the second extension portion 153 is H6, and the length of the main body 151 is H5; the angle between the side of the second extension portion 153 with a length of H2 and the side of the main body 151 is J4, and the length of the second extension portion 153 is The angle between the side of H4 and the side of the main body 151 is J2; the angle between the side of the first extension portion 152 whose length is H1 and the side of the main body 151 is J3, and the angle between the side of the first extension portion 152 whose length is H3 and the side of the main body 151 is J1; and the relationship is satisfied: abs(sin(J1))<(H1+H2+H5) / H6<H3 / H1<B / (A+C)<(H3+H2) / H1<(H6 / W1).

[0055] In order to ensure that the magnetic steel 150 has good stability and performance during installation and operation in the rotor magnet slot 130. By limiting the relationship between the size and angle of each part of the magnetic steel 150, the performance of the magnetic steel 150 during operation can be ensured, magnetic leakage and energy loss can be prevented, and the leakage and energy loss of the magnetic field can be reduced, thereby improving the energy efficiency of the entire system. By satisfying the above relationship, the magnetic field distribution and the magnetic flux closure path can be better controlled to reduce unnecessary energy loss. Limiting the size design of each part of the magnetic steel 150 can reduce the electromagnetic interference generated by the motor or generator during operation, which is beneficial to improving the electromagnetic compatibility of the equipment, improving the working efficiency of the magnetic steel 150, reducing the noise and vibration of the motor during operation, and improving the running smoothness and comfort of the motor.

[0056] The following table shows the output torque data of a rectangular magnetic steel motor of the same size and specification and the motor of the present application at the same speed:

[0057]

[0058] Through the analysis of the above table, under the same speed comparison, the output torque of the motor using the rotor assembly 100 of this solution is greater than the output torque of the traditional rectangular magnetic steel motor. By increasing the usage of the magnetic steel 150 under the same volume, the output torque of the motor is increased, and under the same speed comparison, this solution can better improve the power density of the motor.

[0059] Reference Figure 1 , and combined with 5 to Figure 8Specifically, the rotor core 120 includes a plurality of core punching sheets 121, and a plurality of magnet slots 130 of a core punching sheet 121 are connected in pairs near the inner diameter of the rotor core 120 to form a magnetic slot group 140, and a fixing spring sheet 124 is provided in a magnet slot 130 of the magnetic slot group 140 of the core punching sheet 121. The plurality of core punching sheets 121 are stacked in sequence at a preset angle, and the fixing spring sheets 124 of the upper and lower adjacent core punching sheets 121 are staggered with each other; when a magnetic steel 150 is inserted into a magnetic slot 130, the fixing spring sheet 124 is squeezed and deformed to provide support for the magnetic steel 150.

[0060] Specifically, the magnet slot 130 includes a middle section 131, an inner section 132 and an outer section 134 that are connected. The two inner sections 132 of the magnetic slot group 140 are connected via a connecting slot 133, and both ends of the connecting slot 133 extend beyond the magnet slot 130 to form a "π" shape.

[0061] The core punching sheet 121 has an inner ring portion 126 and a plurality of fan-shaped portions 127 located on the outer peripheral side of the inner ring portion 126. Two spaced-apart fan-shaped portions 12 are connected to the inner ring portion 126. The connecting groove 133 is located between the two fan-shaped portions 127 connected to the inner ring portion 126. A fixing spring piece 124 is provided on the inner ring portion 126. The fixing spring piece 12 is located in the connecting groove 133, and the fixing spring piece 124 extends radially along the outer periphery of the inner ring portion 126.

[0062] Since the magnetic steel 150 and the magnet slot 130 are clearance-matched, in order to ensure the performance of the motor, the magnetic steel 150 needs to be fixed to the magnet slot 130. The mainstream fixing methods are: integral rotor injection molding / potting; applying adhesive between the magnetic steel 150 and the magnet slot 130; adding end plates 110 at both ends of the rotor axial direction; adding expansion material in the magnet slot 130; in the above methods, the rotor punchings and magnetic steel 150 need to be cured with glue, plastic, end plates 110 and other materials, and additional processes are required during production, resulting in low production efficiency and high production costs. At the same time, in the environment of refrigerant and lubricant for a long time, glue, plastic, etc. are prone to compatibility problems, affecting product performance, and even causing the permanent magnet 150 and the rotor core 120 to fail to fix, resulting in failure.

[0063] In this solution, the fixing spring piece 124 at the inner diameter of the rotor fixes the inserted magnet 150, which can not only ensure the clearance fit between the magnet 150 and the magnet slot 130, but also provide sufficient fixing strength for the magnet 150 and realize simple assembly.

[0064] In one embodiment, the fixing spring piece 124 is a single spring piece structure.

[0065] In one embodiment, the fixing spring piece 124 is a double spring piece structure, a double tongue type (snake tongue type).

[0066] The shape of the magnetic slot group 140 is "π"-shaped, and a fixed spring piece 124 is provided at the inner diameter of the rotor punching. The fixed spring piece 124 is located in one of the magnet slots 130 of the magnetic slot group 140. According to the rotation direction, the fixed spring piece 124 is arranged in other magnetic slot groups 140 in sequence. During assembly, a plurality of the core punching sheets 121 are stacked in sequence at a preset angle, and the fixed spring pieces 124 of the upper and lower adjacent core punching sheets 121 are misaligned with each other; thereby, when the fixed spring piece 124 is squeezed and deformed by the magnetic steel 150, it can be placed in the magnet slot 130, thereby avoiding interference between the fixed spring pieces 124 of the upper and lower adjacent core punching sheets 121, which affects the assembly quality of the rotor core 120.

[0067] Reference Figure 5 and Figure 6 , the magnetic slot group 140 is actually equivalent to an inner open magnetic bridge. The inner open magnetic bridge refers to a certain gap or opening in the middle of the magnetic circuit, so that the magnetic field can flow in this gap or opening.

[0068] Compared with independently arranged magnet slots 130, the arrangement of the magnetic slot group 140 in this solution can provide a more flexible magnetic field adjustment method. By controlling the size or shape of the gap, the distribution and intensity of the magnetic field can be effectively adjusted. The effective length of the magnetic circuit can be reduced, thereby reducing magnetic resistance, improving the conduction efficiency of the magnetic circuit, and reducing energy loss. It is conducive to heat dissipation, making it easier to dissipate heat in the magnetic circuit, and helping to improve the stability and reliability of the equipment. The structural design can be simplified, the number of parts can be reduced, the manufacturing cost can be reduced, and the production efficiency can be improved.

[0069] In addition, compared with the fully open internal magnetic bridge solution, the design of the magnetic slot group 140 provides better connection and support between the magnet slots 130, which can reduce vibration and noise during the operation of the rotor and improve the running stability and comfort of the motor. The design of the magnetic slot group 140 can effectively reduce the deformation and damage of the magnet slots 130 and improve the reliability and service life of the rotor.

[0070] Specifically, a magnet slot 130 is provided in the rotor core 120, and a magnetic steel 150 is provided inside the magnet slot 130; the rotor core 120 is provided with one or more pairs of protruding spring pieces at some of the magnet slots 130, which are used to clamp the movement of the magnetic steel 150. During the stacking process of the core punching sheets 121, each layer of the core punching sheets 121 rotates a specific angle, and end plates 110 are provided at both ends of the axial direction of the rotor to increase the rotor's moment of inertia. The magnet slot 130 and the magnetic steel 150 are clearance-fitted. When the magnetic steel 150 is inserted into the magnet slot 130, the magnetic steel 150 is fixed to the rotor core 120 through the protruding fixing spring piece 124 on the inner side of the magnet slot 130. Through the paired groove design, the fixing spring piece 124 has sufficient bending space. In a larger range of clearance fit, it can generate sufficient elastic force to fix the magnetic steel 150 on the core, and avoid plastic deformation and loss of resilience. The punching sheet and the magnetic steel 150 structure of the utility model reduces the cost of the magnetic steel 150, improves the demagnetization of the magnetic steel 150, and further reduces the overall cost of the motor.

[0071] In order to avoid interference of the fixed spring sheet 124, the fixed spring sheet 124 is higher than the slot position of the magnet slot 130, and the height above the slot is 0.05mm-0.2mm. When the magnetic steel 150 is inserted, the fixed spring sheet 124 is squeezed and deformed to provide a fixed support force, which helps to increase the pre-tightening force on the magnetic steel 150. It can be understood that if the range is too small, the deformation is limited and the effect is not obvious; if it is too large, the cost is high; therefore, in order to ensure the effective cooperation between the magnet slot 130 and the magnetic steel 150, and not to affect the quality of the spring sheet too much, the height of the fixed spring sheet 124 above the slot of the magnet slot 130 can be 0.05mm, 0.08mm, 0.10mm, 0.18mm, etc.

[0072] In addition, in order to facilitate the insertion of the magnet 150 into the magnet slot 130 of the rotor core 120, the end edge of the magnet 150 is chamfered. During the insertion of the magnet 150, the chamfer can guide the direction of the spring deformation and reduce the difficulty of inserting the magnet 150.

[0073] Furthermore, the plurality of core punching sheets 121 are externally open magnetic bridges 122 , and the plurality of core punching sheets 121 are provided with rivets 125 on the inner and outer sides in the radial direction, and the plurality of core punching sheets 121 are clamped and fixed by the rivets 125 .

[0074] Specifically, in the rotor core 120 of the outer open magnetic bridge 122 formed by the plurality of core punching sheets 121 , at least two core punching sheets 121 of the fully closed outer magnetic bridge 123 are provided in the middle of the axial direction.

[0075] In this way, compared with the core punching sheets 121 that all adopt the external open magnetic bridge 122 to form the rotor core 120, arranging two, three, or even more core punching sheets 121 of the fully enclosed external magnetic bridge 123 helps to improve the structural stability of the rotor core 120. The arrangement of the core punching sheets 121 of at least two fully enclosed external magnetic bridges 123 is not limited, for example, the core punching sheets 121 of the two fully enclosed external magnetic bridges 123 can be arranged at intervals; or arranged together.

[0076] refer to Figure 5 Specifically, the preset angle is 360° / p, where p is the number of the rotor magnet slots 130. Taking ten magnet slots 130 as an example, the rotation angle of adjacent core punching sheets 121 when stacked is 36°.

[0077] Reference Figure 2 Furthermore, two magnetic steels 150 are provided in a magnet slot 130 of the rotor core 120, and the two magnetic steels 150 are respectively inserted into the magnet slot 130 from both ends of the rotor core 120; the fixed spring pieces 124 located at the two magnetic steels 150 in the magnet slot 130 have opposite deformation directions.

[0078] On the one hand, loading it in two pieces can make better use of raw materials and avoid waste. It is also easier to process and handle during the production process, which may reduce production costs. Loading the magnet 150 into the magnet slot 130 in two pieces can make assembly easier and faster, reduce the complexity and difficulty of the assembly process, and improve production efficiency. Greater flexibility: Loading it in two pieces can also increase the flexibility of the design, and can better adjust the magnetic field distribution and performance to meet different needs. If the magnet 150 needs to be replaced or repaired, loading it in two pieces can make maintenance more convenient, and more precise operations can be performed on individual components, reducing maintenance time and costs.

[0079] On the other hand, compared to inserting two magnets 150 from the same direction, that is, generating the fixed spring pieces 124 with the same deformation direction, by providing two magnets 150 with opposite insertion directions, the magnets 150 are more firmly fixed, which can make the magnetic field more uniform in the magnet slot 130, reduce the fluctuation and unevenness of the magnetic field, and improve the stability and performance of the motor. The opposite deformation directions of the fixed spring pieces 124 can reduce the vibration and noise caused by the change of the magnetic field, and improve the running stability and comfort of the motor.

[0080] Specifically, a preset angle formed by the first extension portion, the second extension portion and the extension direction of the main body ranges from 5° to 60°, such as 5°, 15°, 20°, 25°, etc.

[0081] Specifically, the magnet slot 130 and the magnetic steel 150 are clearance-matched, and the clearance range is 0.05mm≤D≤0.15mm. Too large or too small a gap may increase the instability of the magnetic steel 150 during operation, increase vibration and noise, and reduce the operating stability and reliability of the motor. If the gap is less than 0.05mm, the friction between the magnetic steel 150 and the magnet slot 130 will increase; an appropriate gap can reduce the friction between the magnetic steel 150 and the magnet slot 130 and reduce energy loss. Therefore, in order to ensure the effective fit between the magnet slot 130 and the magnetic steel 150, it is necessary to strictly control the gap between 0.05mm and 0.15mm, for example, 0.05mm, 0.06mm, 0.08mm, 0.10mm, 0.12mm, etc., to give full play to the advantages brought by the design clearance fit.

[0082] Specifically, in order to ensure accurate assembly, the tolerance of the magnet slot 130 is ±0.05 mm, and the tolerance of the magnetic steel 150 is ±0.05 mm.

[0083] Furthermore, in order to increase the rotational inertia of the rotor, the rotor assembly 100 also includes a mounting end plate 110, the mounting end plate 110 fixes the rotor core 120, the thickness of the mounting end plate 110 is W3, and the thickness of the rotor punching is T, satisfying the relationship: (3*T)≤W3≤(H6 / W1).

[0084] Increasing the thickness of the end plate 110 increases the moment of inertia of the rotor, making the rotor more stable when rotating at high speed, and reducing vibration and noise caused by imbalance. The increase in the moment of inertia can reduce the impact force on the rotor during starting and stopping, thereby reducing the impact on the bearings and other mechanical parts and extending the service life of the equipment. The increase in the moment of inertia of the rotor can reduce the acceleration and deceleration of the rotor, reduce the inertial loss generated by the rotor during the start-stop process, and thus improve the power utilization rate of the equipment.

[0085] Specifically, the thickness of the end plate 110 is 5 mm-10 mm.

[0086] By limiting the range of the thickness of the end plate 110, the problems of structural instability or material waste caused by the end plate 110 being too thick or too thin can be avoided, thereby ensuring the rationality of the rotor structure. The thickness of the end plate 110 directly affects the moment of inertia of the rotor. By limiting the range of the thickness of the end plate 110, the performance of the rotor can be effectively controlled. By adjusting the thickness of the end plate 110 within a certain range, the performance of the rotor can be optimized to meet the requirements of equipment operation. On the premise of meeting performance requirements, reducing material consumption as much as possible is conducive to reducing costs. Moreover, by specifying the range of the thickness of the end plate 110, the safety of the rotor structure can be ensured. If the end plate 110 is too thin, it may lead to insufficient strength, while if the end plate 110 is too thick, it may lead to unnecessary waste of material. Specifying a reasonable range helps to ensure the safe operation of the rotor.

[0087] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the concept of the utility model, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A rotor assembly, characterized in that: The rotor assembly comprises: A rotor core, wherein a plurality of magnet slots are provided along a circumferential direction, wherein the magnet slots include a middle section and an inner section and an outer section respectively located inside and outside the middle section, wherein the extension direction of the outer section and the inner section is the same as the radial direction of the rotor core; and the extension direction of the middle section intersects the radial direction of the rotor core at a preset angle; and A magnetic steel, the magnetic steel comprising a main body and a first extension portion and a second extension portion respectively connected to both ends of the main body in a length direction, wherein the extension directions of the first extension portion and the second extension portion are parallel and both form the preset angle with the extension direction of the main body; The magnetic steel is installed in the magnet slot, and the first extension portion, the main body, and the second extension portion are respectively located in the outer section, the middle section, and the inner section.

2. The rotor assembly according to claim 1, characterized in that In a cross section of the magnetic steel perpendicular to the axial direction, the cross-sectional area of ​​the first extension portion is A, the cross-sectional area of ​​the main body is B, and the cross-sectional area of ​​the second extension portion is C, where B>C≥A.

3. The rotor assembly according to claim 2, characterized in that The lengths of both sides of the cross section of the first extension portion are H1 and H3 respectively, and the lengths of both sides of the cross section of the second extension portion are H2 and H4 respectively, wherein H3>H1, H2>H4, and H3 / H1≤H2 / H4.

4. The rotor assembly according to claim 3, characterized in that: The width of the cross section of the first extension portion is W1, the width of the cross section of the second extension portion is W2, the distance between the midpoint of the width of the first extension portion and the midpoint of the width of the second extension portion is H6, and the length of the side of the cross section of the main body is H5; The included angle between the side of the second extension portion having a length of H2 and the side of the main body is J4, and the included angle between the side of the second extension portion having a length of H4 and the side of the main body is J2; The included angle between the side of the first extension portion having a length of H1 and the side of the main body is J3, and the included angle between the side of the first extension portion having a length of H3 and the side of the main body is J1; The relationship is satisfied: abs(sin(J1))<(H1+H2+H5) / H6<H3 / H1<B / (A+C)<(H6 / W1).

5. The rotor assembly according to any one of claims 1 to 4, characterized in that: The material of the magnetic steel is ferrite material.

6. The rotor assembly according to claim 1, wherein: The rotor core comprises a plurality of core punching sheets stacked one on another, wherein the plurality of magnet slots of the core punching sheets are connected in pairs near the inner edge of the rotor core to form a plurality of magnet slot groups, and the two magnet slots of the magnet slot groups are connected via a connecting slot.

7. The rotor assembly according to claim 6, characterized in that The core punching sheet has an inner ring portion and a plurality of fan-shaped portions located on the outer peripheral side of the inner ring portion, two of the fan-shaped portions spaced apart from each other are connected to the inner ring portion, the connecting groove is located between the two fan-shaped portions connected to the inner ring portion, a fixing spring sheet is provided on the inner ring portion, the fixing spring sheet is located in the connecting groove, and the fixing spring sheet extends radially along the outer periphery of the inner ring portion.

8. The rotor assembly according to claim 7, characterized in that The plurality of core punching sheets are externally open magnetic bridges, and the plurality of core punching sheets are provided with rivets on the inner and outer sides in the radial direction, and the plurality of core punching sheets are clamped and fixed by the rivets; And / or, in the rotor core of the outer open magnetic bridge formed by the plurality of core punchings, at least two core punchings of the fully closed outer magnetic bridge are provided in the middle axial portion.

9. The rotor assembly according to claim 7, wherein: The bottom of the fixing spring sheet is higher than the notch of the magnet slot, and the height above the notch is 0.05 mm-0.2 mm.

10. The rotor assembly according to claim 7, wherein: Two magnetic steels are arranged in a magnet slot of the rotor core, and the two magnetic steels are respectively inserted into the magnet slot from two ends of the rotor core; the fixed spring sheets located at the two magnetic steels in the magnet slot have opposite deformation directions.

11. The rotor assembly according to claim 1, wherein: The preset angle formed by the first extension portion, the second extension portion and the extension direction of the main body is in the range of 5° to 60°.

12. The rotor assembly according to claim 1, wherein: The magnet slot and the magnetic steel are clearance matched, and the clearance range is 0.05mm≤D≤0.15mm.

13. The rotor assembly according to claim 4, wherein: The rotor assembly also includes a mounting end plate, which fixes the rotor core. The thickness of the mounting end plate is W3, and the thickness of the rotor punching sheet is T, satisfying the relationship: (3*T)≤W3≤(H6 / W1).

14. A motor, characterized in that: include: stator assembly; and A rotor assembly as claimed in any one of claims 1 to 13.

15. A compressor, characterized in that: Comprising the motor as claimed in claim 14.

16. A refrigeration device, characterized in that: Comprising the compressor of claim 15.

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