Rotor lamination, rotor, electric machine and electric appliance

Abstract

The utility model provides a rotor lamination, rotor, motor and electrical equipment, rotor lamination is provided with radial magnetic steel groove and two groups above tangential magnetic steel groove group, tangential magnetic steel groove group includes first tangential magnetic steel groove and second tangential magnetic steel groove of V type arrangement, two groups of adjacent tangential magnetic steel groove group are used for installing opposite polarity permanent magnet, radial magnetic steel groove sets up between two groups of adjacent tangential magnetic steel groove group, radial magnetic steel groove includes radial permanent magnet installation part and two first magnetic gap, radial permanent magnet installation part extends along the radial direction of rotor lamination, two first magnetic gaps all set up in the second end of radial magnetic steel groove, and along the direction perpendicular to radial permanent magnet installation part is arranged in the both sides of radial permanent magnet installation part, and two first magnetic gaps all communicate with radial permanent magnet installation part. This rotor lamination can optimize air gap magnetic density, improve motor output torque, effectively control permanent magnet consumption while enhancing rotor each pole magnetic flux, reduce motor operating current.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a rotor lamination, a rotor, a motor, and electrical components. Background Technology

[0002] As a core component of commercial air conditioning units, large-displacement scroll compressors account for a large proportion of energy consumption. Compared with ordinary household air conditioning compressors, they have a wider operating frequency range and more severe operating conditions, which places higher demands on the energy consumption and anti-demagnetization capabilities of the compressor motors used in them.

[0003] Compressor motors widely utilize neodymium iron boron permanent magnets as the rotor excitation source, but these are costly and prone to demagnetization at high temperatures. Given the ever-increasing performance requirements of compressor motors, improving the utilization rate and demagnetization resistance of permanent magnets through rotor topology has become a major concern. In existing technologies, motor rotor topologies often employ methods such as... Figure 1 The permanent magnets are arranged in a single "V"-shaped magnet slot 101 or a "I"-shaped magnet slot. In the hybrid magnetic circuit scheme, a "double V" shape or a multi-layer permanent magnet structure combining "V" and "I" shapes is often used to improve the motor's output torque capability and anti-demagnetization capability. The corresponding purpose can also be achieved by upgrading the grade of permanent magnets, but this will lead to an increase in the amount of permanent magnets used and an increase in cost.

[0004] In addition, there is a rotor in which a second permanent magnet is set between two first permanent magnet groups. The first permanent magnet group is a "double V" type or a multi-layer permanent magnet structure combining "V" and "I" type. The second permanent magnet extends radially along the rotor and is used to tangentially magnetize the radial section of the rotor core. However, the end of the second permanent magnet is not provided with a magnetic isolation hole, the end position of the magnet is prone to demagnetization, and it is easy to cause uneven air gap magnetic density, resulting in negative effects such as increased noise, unstable operation, and high harmonic content of back EMF waveform during motor operation. Utility Model Content

[0005] The primary objective of this invention is to provide a rotor lamination that optimizes the air gap magnetic flux density, increases the motor output torque, effectively controls the amount of permanent magnets used, enhances the magnetic flux per pole of the rotor, and reduces the motor operating current.

[0006] The second objective of this invention is to provide a rotor employing the aforementioned rotor laminations.

[0007] The third objective of this invention is to provide a motor employing the aforementioned rotor.

[0008] The fourth objective of this invention is to provide an electrical appliance that uses the aforementioned motor.

[0009] To achieve the aforementioned first objective, this utility model provides a rotor lamination, which is provided with radial magnet slots and two or more sets of tangential magnet slots. The radial magnet slots extend radially along the rotor lamination. Each set of tangential magnet slots is arranged sequentially along the circumference of the rotor lamination, with a pole centerline between adjacent sets of tangential magnet slots, and the adjacent sets of tangential magnet slots are symmetrical about their corresponding pole centerlines. Each set of tangential magnet slots includes a first tangential magnet slot and a second tangential magnet slot arranged in a V-shape, with a magnetic pole centerline between the first tangential magnet slot and the second tangential magnet slot in the same set, and the first tangential magnet slot and the second tangential magnet slot in the same set are symmetrical about their corresponding magnetic pole centerlines. Adjacent sets of tangential magnet slots are used for... The device is equipped with permanent magnets of opposite polarity. Radial magnetic slots are arranged between two adjacent sets of tangential magnetic slots and are symmetrical about the corresponding inter-pole center lines. The radial magnetic slots are located on the side of the tangential magnetic slot set near the outer edge of the rotor lamination. The first end of the radial magnetic slot is near the end of the tangential magnetic slot set, and the second end of the radial magnetic slot is near the outer edge of the rotor lamination. The radial magnetic slot includes a radial permanent magnet mounting part and two first magnetic isolation holes. The radial permanent magnet mounting part extends radially along the rotor lamination. The two first magnetic isolation holes are both located at the second end of the radial magnetic slot and are arranged on both sides of the radial permanent magnet mounting part in a direction perpendicular to the radial permanent magnet mounting part. The two first magnetic isolation holes are connected to the radial permanent magnet mounting part.

[0010] As can be seen from the above scheme, the rotor lamination, based on the tangential "V"-shaped magnet slot, has a radial magnet slot set in the middle of the two adjacent poles of the rotor. This structure utilizes radial permanent magnets to enhance the magnetization effect, and works in conjunction with the tangentially placed "V"-shaped permanent magnets to achieve hybrid magnetic circuit excitation. It eliminates the need for a "double V" shape or a multi-layer permanent magnet structure combining "V" and "I" shapes. Compared with existing hybrid magnetic circuit schemes, it effectively controls the amount of neodymium iron boron rare earth permanent magnets, increases the magnetic flux per pole of the rotor, and reduces the motor operating current. Compared with existing conventional rotors, under the same working conditions, the motor has a higher output torque capability and lower operating current. At the same time, the selection of the magnet slot position and the setting of the magnetic isolation hole in this invention can optimize the magnetic field path, weaken the influence of the demagnetizing magnetic field on the air gap side on the permanent magnet, and improve the anti-demagnetization capability.

[0011] Regarding the optimization of air gap magnetic flux density, existing rotors have magnet slots at the intersection of different polarity magnetic poles, but no magnetic isolation holes are provided. After the magnets are installed at this position, the magnetic flux loops at the ends of the magnets can easily cause uneven air gap magnetic flux density, resulting in negative effects such as increased noise, unstable operation, and high harmonic content in the back EMF waveform during motor operation. In response to this phenomenon, this utility model provides magnetic isolation holes at the ends of the radial magnet slots near the air gap. The magnetic flux loops at the ends of the magnets at this location are obstructed by the magnetic isolation holes, guiding the magnetic flux lines at the ends of the permanent magnets to take a better and larger loop. More magnetic flux lines pass through the stator teeth and are utilized, thus optimizing the air gap magnetic flux density and making the motor run more smoothly.

[0012] Meanwhile, regarding demagnetization resistance, the magnet slots located at the intersection of different polarity magnetic poles, after the magnets are assembled, have their ends directly facing the demagnetizing magnetic field at the air gap. Studies have shown that demagnetization generally occurs first at the magnet ends. This invention, by setting a magnetic isolation hole at this location, can create a high magnetic resistance region at the magnet ends, blocking the influence of the demagnetizing magnetic field on the air gap side and reducing the risk of demagnetization at this location. Furthermore, the rotor laminations feature both radial and tangential permanent magnet placement. Radial permanent magnets are vertically inserted into the core, preventing the magnets from directly facing the air gap. Combined with the magnetic isolation structure near the air gap side, this effectively weakens the impact of armature reaction on the permanent magnets. Simultaneously, the tangential "V"-shaped placement of the permanent magnets in this design weakens the influence of the demagnetizing magnetic field and localized high temperatures on the air gap side, improving overall demagnetization resistance.

[0013] Furthermore, the rotor laminations of this invention can significantly reduce the amount of magnets used, achieving an optimal ratio of radial magnets and tangential V-type magnets. The combination of radial and tangential V-type magnets is more suitable for variable frequency compressors. V-type magnets have the characteristic of high magnetic reluctance torque, which is beneficial to the reduction of overall energy consumption. Moreover, the V-type magnet scheme is generally more energy-efficient than the straight-line scheme and has better torque balance.

[0014] A preferred embodiment is that the rotor lamination is also provided with a second magnetic isolation hole, which is located between two adjacent sets of tangential magnet slots and the corresponding radial magnet slots.

[0015] It can be seen that by opening magnetic isolation holes between adjacent permanent magnets, and leaving only a thin layer of silicon steel material between the magnetic isolation holes and the permanent magnets, the magnetic field in this area is easily saturated, leading to an increase in magnetic resistance, which in turn prevents magnetic lines of force from passing through. A further embodiment is that the second magnetic isolation hole is triangular, with the first side of the second magnetic isolation hole parallel to the end wall of the radial magnetic groove, the second side of the second magnetic isolation hole parallel to the end wall of the adjacent first tangential magnetic groove, and the third side of the second magnetic isolation hole parallel to the end wall of the adjacent second tangential magnetic groove.

[0016] Therefore, by opening magnetic isolation holes at the adjacent positions of the magnetic steel groove, a narrower channel is retained to form a high magnetic resistance region, which effectively reduces magnetic leakage and weakens the eddy current at the end of the permanent magnet at this position, thus reducing losses.

[0017] A further embodiment is that the distance between the first side of the second magnetic isolation hole and the end wall of the radial magnetic groove is the first distance, the distance between the second side of the second magnetic isolation hole and the end wall of the adjacent first tangential magnetic groove is the second distance, and the distance between the third side of the second magnetic isolation hole and the end wall of the adjacent second tangential magnetic groove is the third distance, and the first distance, the second distance and the third distance are all equal.

[0018] A further design includes two third magnetic isolation holes in each group of tangential magnet slots. The two third magnetic isolation holes are located at the ends of the first and second tangential magnet slots in the same group, respectively, near the center line of their corresponding magnetic poles.

[0019] A further proposed solution is to make the spacing between the two third magnetic isolation holes in the same group equal to the first distance.

[0020] A preferred embodiment is that the rotor laminations are also provided with first magnetic barriers, and each group of tangential magnet slots corresponds to two first magnetic barriers. The first first magnetic barrier is set to correspond to the first tangential magnet slot, and the second first magnetic barrier is set to correspond to the second tangential magnet slot.

[0021] Therefore, by setting up magnetic barriers, the magnetic circuit can be optimized, the inherent magnetic field lines of the permanent magnet can be altered, more magnetic field lines can be guided through the air gap, magnetic leakage can be reduced, and thus the utilization rate of the permanent magnet's magnetic field can be improved. Furthermore, by selecting the placement area of ​​the permanent magnet and setting up magnetic barriers, the influence of the demagnetizing magnetic field on the air gap side can be weakened, and the overall anti-demagnetizing capability can be improved.

[0022] A further embodiment is that the first magnetic barrier is perpendicular to the corresponding first tangential magnet slot, and the second magnetic barrier is perpendicular to the corresponding second tangential magnet slot; and / or, in the extension direction of the first tangential magnet slot, the corresponding first magnetic barrier is located in the middle of the first tangential magnet slot; and / or, in the extension direction of the second tangential magnet slot, the corresponding first magnetic barrier is located in the middle of the second tangential magnet slot; and / or, in the normal direction of the first tangential magnet slot, the corresponding first magnetic barrier is located on the side of the first tangential magnet slot near the outer edge of the rotor lamination; and / or, in the normal direction of the second tangential magnet slot, the corresponding first magnetic barrier is located on the side of the second tangential magnet slot near the outer edge of the rotor lamination.

[0023] A further option is to provide a second magnetic barrier on the rotor lamination, with one radial magnetic slot corresponding to two second magnetic barriers, and the two second magnetic barriers being respectively located on opposite sides of the corresponding radial magnetic slot.

[0024] Therefore, it can be seen that in this utility model, magnetic barriers are set at positions such as the side of the magnet trough near the air gap and the middle of the magnet trough to change the original path of the magnetic lines of the permanent magnet placed there, so that more magnetic lines of force can pass through the air gap, reducing magnetic leakage and improving the utilization rate of the magnetic field. Magnetic isolation holes are set at the intersection of multiple magnets and at the end of the radial magnets near the air gap to reduce magnetic leakage, weaken eddy currents, and reduce losses and demagnetization risks.

[0025] A further embodiment is that the arrangement direction of the two second magnetic barriers corresponding to a radial magnetic groove is perpendicular to the extension direction of the corresponding radial magnetic groove, and the extension direction of the two second magnetic barriers is also perpendicular to the extension direction of the corresponding radial magnetic groove; and / or in the extension direction of the radial magnetic groove, the two corresponding second magnetic barriers are both located in the middle of the radial magnetic groove; and / or both the first magnetic barrier and the second magnetic barrier are rectangular; and / or the width of the first magnetic barrier and the width of the second magnetic barrier are equal; and / or the first tangential magnet... The lengths of the tangential permanent magnet mounting portions of the first and second tangential magnet slots are both a1, and the length of the radial permanent magnet mounting portions is a2. The relationship between a1 and a2 is: a1 = 1.875a2; and / or the widths of the tangential permanent magnet mounting portions of the first and second tangential magnet slots are both b1, and the width of the radial permanent magnet mounting portions is b2. The relationship between b1 and b2 is: b2 > b1, and b2 = 1.2(b1 - 0.1).

[0026] Therefore, the thickness of the radially placed permanent magnet should be greater than that of the tangentially placed permanent magnet. At the same time, the arrangement of the tangential and radial types of magnet slots should satisfy the condition that b2 > b1 and b2 = 1.2(b1-0.1). After assembling the magnets, a better magnetic field superposition effect can be achieved, and the amount of magnets used is only 4.4% more than that of conventional rotors.

[0027] A further scheme is that the distance between the centerline of the first magnetic barrier and the first end wall of the corresponding first tangential magnetic groove is c1, the centerline is parallel to the extension direction of the first magnetic barrier, and the first end wall is the end wall of the first tangential magnetic groove near the radial magnetic groove, and a1 and c1 satisfy: a1=3c1; and / or the distance between the centerline of the second magnetic barrier and the second end wall of the corresponding radial magnetic groove is c2, the second end wall is the end wall of the radial magnetic groove near the tangential magnetic groove group, and a2 and c2 satisfy: a2=2c1.

[0028] A preferred embodiment is that the included angle between the first and second tangential magnet slots in the same group is 139.2°; and / or the number of radial and tangential magnet slot groups is six each, with the included angle between the centerlines of two adjacent radial magnet slots being 60°; and / or the distance between the reference point of the first tangential magnet slot and the center of the rotor lamination is h1, the distance between the reference point of the radial magnet slot and the center of the rotor lamination is h2, and the depth to which the permanent magnet used to install in the first tangential magnet slot is embedded in the rotor core is H. 切向 =R-h1, where H is the depth to which the permanent magnet used for mounting in the radial magnet slot is embedded in the rotor core. 径向 =R-h2, where R is the radius of the rotor lamination, and H... 切向 =21.602mm, H 径向 =9.502mm.

[0029] Therefore, this embedding depth can weaken the influence of the air gap side demagnetizing magnetic field and local high temperature on the permanent magnet, and improve the overall demagnetizing resistance of the motor.

[0030] To achieve the second objective mentioned above, this utility model provides a rotor, including a rotor core, which is formed by stacking the aforementioned rotor laminations along the axial direction of the rotor.

[0031] To achieve the third objective mentioned above, this utility model provides an electric motor, including the rotor described above.

[0032] To achieve the fourth objective mentioned above, this utility model provides an electrical appliance, including the aforementioned motor. Attached Figure Description

[0033] Figure 1 This is a structural diagram of an existing rotor lamination.

[0034] Figure 2 This is a structural diagram of the first embodiment of the rotor of this utility model.

[0035] Figure 3 This is a structural diagram of the first embodiment of the rotor lamination of this utility model.

[0036] Figure 4 This is a structural diagram of the tangential magnet slot assembly in the first embodiment of the rotor lamination of this utility model.

[0037] Figure 5 This is a structural diagram of the radial magnet slot in the first embodiment of the rotor lamination of this utility model.

[0038] Figure 6 This is a schematic diagram of the magnetic circuit of the rotor without magnetic isolation holes in the first embodiment of the rotor lamination of this utility model.

[0039] Figure 7 yes Figure 6 An enlarged view of the magnetic circuit of a permanent magnet placed in a radial magnetic groove.

[0040] Figure 8 This is a schematic diagram of the magnetic circuit of the rotor in the first embodiment of the rotor of this utility model.

[0041] Figure 9 yes Figure 8 An enlarged view of the magnetic circuit of a permanent magnet placed in a radial magnetic groove.

[0042] Figure 10 This is a schematic diagram of the high magnetic resistance region in the first embodiment of the rotor of this utility model.

[0043] Figure 11 This is a structural diagram of the third magnetic isolation groove in the first embodiment of the rotor lamination of this utility model.

[0044] Figure 12 This is a structural diagram of the second magnetic isolation groove in the first embodiment of the rotor lamination of this utility model.

[0045] Figure 13 This is a structural diagram of the first magnetic isolation groove in the first embodiment of the rotor lamination of this utility model.

[0046] Figure 14 This is a comparison diagram of the back EMF data between an existing rotor and the first embodiment of the rotor of this utility model.

[0047] Figure 15 This is a comparison diagram of magnetic flux linkage data between an existing rotor and the first embodiment of the rotor of this utility model.

[0048] Figure 16 This is a comparison chart of the amount of magnets used in existing rotors and the first embodiment of the rotor of this utility model.

[0049] Figure 17 This is a structural diagram of the second embodiment of the rotor of this utility model.

[0050] Figure 18 This is a structural diagram of the first magnetic barrier in the second embodiment of the rotor lamination of this utility model.

[0051] Figure 19 This is a structural diagram of the second magnetic barrier in the second embodiment of the rotor lamination of this utility model.

[0052] Figure 20 This is a schematic diagram of the magnetic circuit of the second embodiment of the rotor of this utility model.

[0053] Figure 21 This is a structural diagram of the third embodiment of the rotor lamination of this utility model.

[0054] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0055] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present invention or its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete, and to fully express the scope of the present invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0056] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0057] In this invention, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not exist between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may not be directly connected to the other devices but may have an intermediary device.

[0058] All terms used in this invention (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0059] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0060] First embodiment of rotor laminations, rotor, motor and electrical components: See Figures 2 to 13 In this embodiment, the electrical appliance can be a variable frequency compressor. The variable frequency compressor includes a motor, which is a permanent magnet motor. The motor includes a stator and a rotor. The rotor is disposed on the radial inner side of the stator, and an air gap 100 is formed between the stator and the rotor.

[0061] See Figure 2 and Figure 3 The rotor includes a rotor core and a permanent magnet 3. The rotor core is formed by stacking rotor laminations 10 along the rotor axis. The rotor lamination 10 is provided with radial magnet slots 1 and two or more sets of tangential magnet slot groups 2. Permanent magnets 3 are installed in both the radial magnet slots 1 and the tangential magnet slot groups 2. In this embodiment, there are six radial magnet slots 1 and six sets of tangential magnet slot groups 2. The six sets of tangential magnet slot groups 2 are evenly arranged along the circumference of the rotor lamination 10. Each set of tangential magnet slot groups 2 is arranged sequentially along the circumference of the rotor lamination 10. There is a pole center line 4 between adjacent sets of tangential magnet slot groups 2. Adjacent sets of tangential magnet slot groups 2 are symmetrical about the corresponding pole center line 4. Adjacent sets of tangential magnet slot groups 2 are used to install permanent magnets 3 of opposite polarity.

[0062] Each group of tangential magnet slots 2 includes a first tangential magnet slot 21 and a second tangential magnet slot 22 arranged in a V-shape. The first tangential magnet slot 21 and the second tangential magnet slot 22 in the same group have a magnetic pole center line 6 between them. The first tangential magnet slot 21 and the second tangential magnet slot 22 in the same group are symmetrical about the corresponding magnetic pole center line 6.

[0063] The radial magnet slot 1 extends radially along the rotor lamination 10. The radial magnet slot 1 is arranged between two adjacent sets of tangential magnet slots 2 and is symmetrical about the corresponding inter-pole center line 4. The radial magnet slot 1 is located on the side of the tangential magnet slot set 2 near the outer edge of the rotor lamination 10. The first end of the radial magnet slot 1 is close to the end of the tangential magnet slot set 2, and the second end of the radial magnet slot 1 is close to the outer edge of the rotor lamination 10.

[0064] like Figure 4 and Figure 13 As shown, the radial magnet groove 1 includes a radial permanent magnet mounting part 11 and two first magnetic isolation holes 12. The radial permanent magnet mounting part 11 extends radially along the rotor lamination 10. The two first magnetic isolation holes 12 are both located at the second end of the radial magnet groove 1 and are arranged on both sides of the radial permanent magnet mounting part 11 in a direction perpendicular to the radial permanent magnet mounting part 11. Both first magnetic isolation holes 12 are connected to the radial permanent magnet mounting part 11. The two first magnetic isolation holes 12 and a part of the radial permanent magnet mounting part 11 form an approximately trapezoidal structure. The first base a5 of the trapezoid is 7mm, the second base a6 is 5mm, and the height b5 is 1mm. The distance between the first magnetic isolation holes 12 and the air gap is 0.6mm, forming a high magnetic resistance region 7 (e.g., ...) between the permanent magnet 3 and the air gap. Figure 10 As shown), it can effectively block the influence of the air gap side demagnetizing magnetic field on the radially placed permanent magnet 3, and at the same time, as Figures 6 to 9 As shown, the first magnetic isolation hole 12 can guide the magnetic lines of force at the end of the permanent magnet 3 to follow a better loop, thereby optimizing the air gap magnetic flux density.

[0065] The rotor lamination 10 is also provided with a second magnetic isolation hole 5. The second magnetic isolation hole 5 is located between two adjacent sets of tangential magnet slots 2 and the corresponding radial magnet slots 1. By opening a magnetic isolation hole between adjacent permanent magnets 3, only a thin layer of silicon steel material is left between the magnetic isolation hole and the permanent magnet 3. The magnetic field in this area is easily saturated, resulting in an increase in magnetic reluctance, thus preventing magnetic lines of force from passing through. The second magnetic isolation hole 5 is triangular. The first side of the second magnetic isolation hole 5 is parallel to the end wall of the radial magnet slot 1, the second side of the second magnetic isolation hole 5 is parallel to the end wall of the adjacent first tangential magnet slot 21, and the third side of the second magnetic isolation hole 5 is parallel to the end wall of the adjacent second tangential magnet slot 22. The distance between the first side of the second magnetic isolation hole 5 and the end wall of the radial magnetic groove 1 is the first distance; the distance between the second side of the second magnetic isolation hole 5 and the end wall of the adjacent first tangential magnetic groove 21 is the second distance; and the distance between the third side of the second magnetic isolation hole 5 and the end wall of the adjacent second tangential magnetic groove 22 is the third distance. The first distance, the second distance, and the third distance are all equal.

[0066] See Figure 11 and Figure 12 Both the first tangential magnet groove 21 and the second tangential magnet groove 22 include a tangential permanent magnet mounting part 23 and a third magnetic isolation hole 24. The third magnetic isolation hole 24 of the first tangential magnet groove 21 and the third magnetic isolation hole 24 of the second tangential magnet groove 22 are respectively located at the ends of the corresponding tangential permanent magnet mounting parts 23. The two third magnetic isolation holes 24 in the same group are respectively located at the ends of the first tangential magnet groove 21 and the second tangential magnet groove 22 in the same group, close to the corresponding magnetic pole center line 6. The spacing c5, the first distance c6, the second distance c6 and the third distance c6 between the two third magnetic isolation holes 24 in the same group are all 0.5mm. By opening magnetic isolation holes at adjacent positions of the magnet grooves, a narrow channel is retained to form a high magnetic resistance region 7, which effectively reduces magnetic leakage and weakens the eddy current at the end of the permanent magnet 3 at this position, reducing losses.

[0067] See Figure 4 and Figure 5The lengths of the tangential permanent magnet mounting portions 23 of the first tangential magnet groove 21 and the second tangential permanent magnet groove 22 are both a1, a1 = 15 mm. The length of the radial permanent magnet mounting portion 11 is a2, a2 ​​= 8 mm, and a1 and a2 satisfy the condition: a1 = 1.875a2. The widths of the tangential permanent magnet mounting portions 23 of the first tangential magnet groove 21 and the second tangential permanent magnet groove 22 are both b1, b1 = 2.6 mm. The width of the radial permanent magnet mounting portion 11 is b2, b2 = 3 mm, and b1 and b2 satisfy the condition: b2 > b1, and b2 = 1.2(b1 - 0.1). The thickness of the radially placed permanent magnet 3 should be greater than that of the tangentially placed permanent magnet 3. At the same time, the arrangement of the tangential and radial types of magnet slots should satisfy the condition that b2 > b1 and b2 = 1.2(b1-0.1). After assembling the magnets, a better magnetic field superposition effect can be achieved, and the amount of magnets used is only 4.4% more than that of conventional rotors.

[0068] The included angle α between the first tangential magnet slot 21 and the second tangential magnet slot 22 in the same group is 139.2°, the included angle β between the centerlines of two adjacent radial magnet slots 1 is 60°, the centerline of the radial magnet slot 1 coincides with the q-axis of the rotor, the distance between the reference point of the first tangential magnet slot 21 and the center of the rotor lamination 10 is h1, the distance between the reference point of the radial magnet slot 1 and the center of the rotor lamination 10 is h2, and the depth to which the permanent magnet 3 used to install in the first tangential magnet slot 21 is embedded in the rotor core is H. 切向 =R-h1, where the depth of the permanent magnet 3 embedded in the rotor core for mounting in the radial magnet slot 1 is H. 径向 =R-h2, where R is the radius of rotor lamination 10, R=44.2mm, h1=22.598mm, h2=34.698mm, H 切向 =21.602mm, H 径向 =9.502mm. This embedding depth can weaken the influence of the demagnetizing magnetic field on the air gap side and the local high temperature on the permanent magnet 3, and improve the overall demagnetizing resistance of the motor.

[0069] See Figures 14 to 16 Compared with existing ordinary rotors, the rotor of this utility model, with the same stator and magnet grade, only increases the amount of magnets by 4%, effectively improving the motor back EMF and magnetic flux. The magnetic concentration effect of the rotor structure is realized. The increase in back EMF and magnetic flux means that the motor's output torque capability will also be enhanced. At the same time, the increase in back EMF can effectively suppress the surge in operating current and reduce power consumption.

[0070] As can be seen from the above, the existing motor rotor topology mostly uses "V"-shaped or "I"-shaped magnet slots to arrange permanent magnets. In the hybrid magnetic circuit scheme, a multi-layer permanent magnet structure combining "double V" and "V"-shaped and "I"-shaped structures is often used to improve the output torque capacity and the ability to resist the demagnetizing magnetic field on the air gap side. The multi-layer permanent magnet structure inevitably increases the amount of permanent magnet steel used, which increases the cost. The single-layer permanent magnet structure has slightly weaker resistance to demagnetization redundancy.

[0071] The rotor lamination of this invention, based on the tangential "V"-shaped magnet slot, has a radial magnet slot located between adjacent poles of the rotor. This structure utilizes radial permanent magnets to enhance the magnetizing effect, combined with the tangentially placed "V"-shaped permanent magnets, to achieve hybrid magnetic circuit excitation. It eliminates the need for a "double V" shape or a multi-layer permanent magnet structure combining "V" and "I" shapes. Compared to existing hybrid magnetic circuit schemes, this design effectively controls the amount of neodymium iron boron rare earth permanent magnets, increases the magnetic flux per pole of the rotor, and reduces the motor operating current. Compared to existing conventional rotors, under the same working conditions, this design improves the motor's output torque capability and reduces the operating current. Furthermore, the selection of the magnet slot position and the setting of the magnetic isolation holes in this invention optimize the magnetic field path, weaken the influence of the demagnetizing magnetic field on the air gap side on the permanent magnets, and improve the anti-demagnetization capability.

[0072] Regarding the optimization of air gap magnetic flux density, existing rotors have magnet slots at the intersection of different polarity magnetic poles, but no magnetic isolation holes are provided. After the magnets are installed at this position, the magnetic flux loops at the ends of the magnets can easily cause uneven air gap magnetic flux density, resulting in negative effects such as increased noise, unstable operation, and high harmonic content in the back EMF waveform during motor operation. In response to this phenomenon, this utility model provides magnetic isolation holes at the ends of the radial magnet slots near the air gap. The magnetic flux loops at the ends of the magnets at this location are obstructed by the magnetic isolation holes, guiding the magnetic flux lines at the ends of the permanent magnets to take a better and larger loop. More magnetic flux lines pass through the stator teeth and are utilized, thus optimizing the air gap magnetic flux density and making the motor run more smoothly.

[0073] Meanwhile, regarding demagnetization resistance, the magnet slots located at the intersection of different polarity magnetic poles, after the magnets are assembled, have their ends directly facing the demagnetizing magnetic field at the air gap. Studies have shown that demagnetization generally occurs first at the magnet ends. This invention, by setting a magnetic isolation hole at this location, can create a high magnetic resistance region at the magnet ends, blocking the influence of the demagnetizing magnetic field on the air gap side and reducing the risk of demagnetization at this location. Furthermore, the rotor laminations feature both radial and tangential permanent magnet placement. Radial permanent magnets are vertically inserted into the core, preventing the magnets from directly facing the air gap. Combined with the magnetic isolation structure near the air gap side, this effectively weakens the impact of armature reaction on the permanent magnets. Simultaneously, the tangential "V"-shaped placement of the permanent magnets in this design weakens the influence of the demagnetizing magnetic field and localized high temperatures on the air gap side, improving overall demagnetization resistance.

[0074] Furthermore, the rotor laminations of this invention can significantly reduce the amount of magnets used, achieving an optimal ratio of radial magnets and tangential V-type magnets. The combination of radial and tangential V-type magnets is more suitable for variable frequency compressors. V-type magnets have the characteristic of high magnetic reluctance torque, which is beneficial to the reduction of overall energy consumption. Moreover, the V-type magnet scheme is generally more energy-efficient than the straight-line scheme and has better torque balance.

[0075] Second embodiment of rotor laminations, rotor, motor and electrical components: As a description of the second embodiment of the rotor laminations, rotor, motor and electrical appliances of this utility model, the following description only focuses on the differences from the first embodiment of the rotor laminations, rotor, motor and electrical appliances described above.

[0076] See Figures 17 to 20 In this embodiment, the rotor lamination 20 is also provided with a first magnetic barrier 201 and a second magnetic barrier 202, both of which are rectangular.

[0077] Each set of tangential magnet slots 203 corresponds to two first magnetic barriers 201. The first first magnetic barrier 201 is set corresponding to the first tangential magnet slot 204, and the second first magnetic barrier 201 is set corresponding to the second tangential magnet slot 205. The first first magnetic barrier 201 is perpendicular to the corresponding first tangential magnet slot 204, and the second first magnetic barrier 201 is perpendicular to the corresponding second tangential magnet slot 205. That is, the angle δ between the centerline of the first first magnetic barrier 201 and the corresponding first tangential magnet slot 204 is 90°, and the angle between the second first magnetic barrier 201 and the corresponding second tangential magnet slot 205 is 90°. The width b3 of the first magnetic barrier 201 and the width b4 of the second magnetic barrier 202 are equal, and b3 = b4 = 1 mm. The length a3 of the first magnetic barrier 201 is 10 mm, and the length a4 of the second magnetic barrier 202 is 4 mm.

[0078] In the extending direction of the first tangential magnet slot 204, the corresponding first magnetic barrier 201 is located in the middle of the first tangential magnet slot 204. In the extending direction of the second tangential magnet slot 205, the corresponding first magnetic barrier 201 is located in the middle of the second tangential magnet slot 205. In the normal direction of the first tangential magnet slot 204, the corresponding first magnetic barrier 201 is located on the side of the first tangential magnet slot 204 near the outer edge of the rotor lamination 20. In the normal direction of the second tangential magnet slot 205, the corresponding first magnetic barrier 201 is located on the side of the second tangential magnet slot 205 near the outer edge of the rotor lamination 20.

[0079] A radial magnetic groove 206 is correspondingly arranged with two second magnetic barriers 202, and the two second magnetic barriers 202 are respectively arranged on opposite sides of the corresponding radial magnetic groove 206. In this invention, magnetic barriers are set at positions such as near the air gap side of the magnetic groove and in the middle of the magnetic groove to change the original path of the magnetic lines of force of the permanent magnet placed there, so that more magnetic lines of force can pass through the air gap, reducing magnetic leakage and improving the utilization rate of the magnetic field. Magnetic isolation holes are set at the intersection of multiple magnets and at the end of the radial magnet near the air gap to reduce magnetic leakage, weaken eddy currents, and reduce losses and demagnetization risks.

[0080] The arrangement direction of the two second magnetic barriers 202 corresponding to a radial magnetic groove 206 is perpendicular to the extension direction of the corresponding radial magnetic groove 206, and the extension direction of the two second magnetic barriers 202 is also perpendicular to the extension direction of the corresponding radial magnetic groove 206. In the extension direction of the radial magnetic groove 206, the two corresponding second magnetic barriers 202 are both located in the middle of the radial magnetic groove 206.

[0081] The positions of the first magnetic barrier 201 and the second magnetic barrier 202 in the rotor yoke are related to the positions of the magnetic slots. The distance between the first magnetic barrier 201 and the corresponding first tangential magnetic slot 204, and the distance between the second magnetic barrier 201 and the corresponding second tangential magnetic slot 205, are both h3, where h3 = 2 mm. The distance between the first magnetic barrier 202 and the corresponding radial magnetic slot 206, and the distance between the second magnetic barrier 202 and the corresponding radial magnetic slot 206, are both h4, where h4 = 1 mm. The distance between the centerline of the first magnetic barrier 201 and the first end wall of the corresponding first tangential magnetic slot 204 is c1. This centerline is parallel to the extension direction of the first magnetic barrier 201. The first end wall is the end wall of the first tangential magnetic slot 204 near the radial magnetic slot 206. The relationship between a1 and c1 satisfies: a1 = 3c1. The distance between the centerline of the second magnetic barrier 202 and the second end wall of the corresponding radial magnetic groove 206 is c2. The second end wall is the end wall of the radial magnetic groove 206 near the tangential magnetic groove group 203. The relationship between a2 and c2 is: a2=2c1.

[0082] By setting up magnetic barriers, the magnetic circuit can be optimized, the inherent magnetic field lines of the permanent magnet can be altered, more magnetic field lines can be guided through the air gap, magnetic leakage can be reduced, and thus the utilization rate of the permanent magnet's magnetic field can be improved. Furthermore, by selecting the placement area of ​​the permanent magnet and setting up magnetic barriers, the influence of the demagnetizing magnetic field on the air gap side can be weakened, improving the overall resistance to demagnetization.

[0083] Third embodiment of rotor laminations, rotor, motor and electrical components: As a description of the third embodiment of the rotor laminations, rotor, motor and electrical appliances of this utility model, the following description only focuses on the differences from the second embodiment of the rotor laminations, rotor, motor and electrical appliances described above.

[0084] See Figure 21 In this embodiment, the rotor lamination 30 is provided with only the first magnetic barrier 301 and not the second magnetic barrier, and only the first magnetic isolation hole 302 and the third magnetic isolation hole 303 are provided, and not the second magnetic isolation hole.

[0085] Furthermore, in this embodiment, the tangential magnet groove 304 is closer to the air gap than in the first and second embodiments, meaning that the tangentially placed permanent magnet is embedded in the iron core at a shallower depth. This allows for adjustment of torque output capability, but reduces the resistance to demagnetization.

[0086] Furthermore, the distance between the tangential magnet slots and the outer edge of the rotor laminations can be adjusted according to actual needs. The dimensions, positions, shapes, and quantities of the tangential magnet slots, radial magnet slots, rotor shaft holes, magnetic barriers in the yoke, and magnetic isolation holes, as well as the material of the permanent magnets, can all be changed as needed. These changes can also achieve the purpose of this utility model.

[0087] Finally, it should be emphasized that the above are only preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. The rotor laminations are equipped with radial magnet slots and two or more sets of tangential magnet slots; The radial magnet slots extend radially along the rotor laminations; Each of the tangential magnet slot groups is arranged sequentially along the circumference of the rotor lamination. There is an inter-pole center line between two adjacent groups of tangential magnet slot groups, and the two adjacent groups of tangential magnet slot groups are symmetrical about the corresponding inter-pole center line. Each group of tangential magnet slots includes a first tangential magnet slot and a second tangential magnet slot arranged in a V-shape. The first tangential magnet slot and the second tangential magnet slot in the same group have a magnetic pole center line between them. The first tangential magnet slot and the second tangential magnet slot in the same group are symmetrical about the corresponding magnetic pole center line. The two adjacent sets of tangential magnet slots are used to install permanent magnets of opposite polarity; Its features are: The radial magnet slots are arranged between two adjacent sets of tangential magnet slots and are symmetrical about the corresponding inter-pole center line. The radial magnet slots are located on the side of the tangential magnet slot set near the outer edge of the rotor lamination. The first end of the radial magnet slot is close to the end of the tangential magnet slot group, and the second end of the radial magnet slot is close to the outer edge of the rotor lamination; The radial magnet groove includes a radial permanent magnet mounting part and two first magnetic isolation holes. The radial permanent magnet mounting part extends radially along the rotor lamination. The two first magnetic isolation holes are both located at the second end of the radial magnet groove and are arranged on both sides of the radial permanent magnet mounting part in a direction perpendicular to the radial permanent magnet mounting part. The two first magnetic isolation holes are connected to the radial permanent magnet mounting part.

2. The rotor lamination according to claim 1, characterized in that: The rotor lamination is also provided with a second magnetic isolation hole, which is located between two adjacent sets of tangential magnet slots and the corresponding radial magnet slots.

3. The rotor lamination according to claim 2, characterized in that: The second magnetic isolation hole is triangular, with the first side of the second magnetic isolation hole parallel to the end wall of the radial magnetic groove, the second side of the second magnetic isolation hole parallel to the end wall of the adjacent first tangential magnetic groove, and the third side of the second magnetic isolation hole parallel to the end wall of the adjacent second tangential magnetic groove.

4. The rotor lamination according to claim 3, characterized in that: The distance between the first side of the second magnetic isolation hole and the end wall of the radial magnet groove is the first distance, the distance between the second side of the second magnetic isolation hole and the end wall of the adjacent first tangential magnet groove is the second distance, and the distance between the third side of the second magnetic isolation hole and the end wall of the adjacent second tangential magnet groove is the third distance. The first distance, the second distance, and the third distance are all equal.

5. The rotor lamination according to claim 4, characterized in that: Each group of tangential magnet slots also includes two third magnetic isolation holes, which are located at the ends of the first and second tangential magnet slots in the same group, near the corresponding magnetic pole center lines.

6. The rotor lamination according to claim 5, characterized in that: The distance between the two third magnetic isolation holes in the same group is equal to the first distance.

7. The rotor lamination according to any one of claims 1 to 6, characterized in that: The rotor lamination is also provided with a first magnetic barrier. Each group of tangential magnet slots corresponds to two first magnetic barriers. The first first magnetic barrier is set with the first tangential magnet slot, and the second first magnetic barrier is set with the second tangential magnet slot.

8. The rotor lamination according to claim 7, characterized in that: The first magnetic barrier is perpendicular to the corresponding first tangential magnet slot, and the second magnetic barrier is perpendicular to the corresponding second tangential magnet slot; and / or In the extending direction of the first tangential magnet groove, the corresponding first magnetic barrier is located at the middle of the first tangential magnet groove; and / or In the extending direction of the second tangential magnet groove, the corresponding first magnetic barrier is located at the middle of the second tangential magnet groove; and / or In the normal direction of the first tangential magnet slot, the corresponding first magnetic barrier is located on the side of the first tangential magnet slot near the outer edge of the rotor lamination; and / or In the normal direction of the second tangential magnet slot, the corresponding first magnetic barrier is located on the side of the second tangential magnet slot near the outer edge of the rotor lamination.

9. The rotor lamination according to claim 7, characterized in that: The rotor lamination is also provided with a second magnetic barrier. One radial magnetic groove is provided with two second magnetic barriers, and the two second magnetic barriers are respectively provided on opposite sides of the corresponding radial magnetic groove.

10. The rotor lamination according to claim 9, characterized in that: The arrangement direction of the two second magnetic barriers corresponding to one of the radial magnetic slots is perpendicular to the extension direction of the corresponding radial magnetic slot, and the extension direction of both second magnetic barriers is perpendicular to the extension direction of the corresponding radial magnetic slot; and / or In the extending direction of the radial magnet groove, the two corresponding second magnetic barriers are both located in the middle of the radial magnet groove; and / or Both the first magnetic barrier and the second magnetic barrier are rectangular; and / or The width of the first magnetic barrier is equal to the width of the second magnetic barrier; and / or The lengths of the tangential permanent magnet mounting portions of the first and second tangential magnet slots are both a1, and the length of the radial permanent magnet mounting portion is a2. The relationship between a1 and a2 satisfies: a1 = 1.875a2; and / or The width of the tangential permanent magnet mounting part of the first tangential magnet groove and the tangential permanent magnet mounting part of the second tangential magnet groove are both b1, and the width of the radial permanent magnet mounting part is b2. The relationship between b1 and b2 is: b2 > b1, and b2 = 1.2(b1-0.1).

11. The rotor lamination according to claim 10, characterized in that: The distance between the centerline of the first magnetic barrier and the first end wall of the corresponding first tangential magnet groove is c1. This centerline is parallel to the extension direction of the first magnetic barrier. The first end wall is the end wall of the first tangential magnet groove closest to the radial magnet groove. The following conditions must be satisfied between a1 and c1: a1 = 3c1; and / or The distance between the centerline of the second magnetic barrier and the second end wall of the corresponding radial magnetic groove is c2. The second end wall is the end wall of the radial magnetic groove that is close to the tangential magnetic groove group. The relationship between a2 and c2 is: a2=2c1.

12. The rotor lamination according to any one of claims 1 to 6, characterized in that: The included angle between the first tangential magnet slot and the second tangential magnet slot in the same group is 139.2°; and / or The number of radial magnet slots and the number of tangential magnet slot groups are both six, and the included angle between the centerlines of two adjacent radial magnet slots is 60°; and / or The distance between the reference point of the first tangential magnet slot and the center of the rotor lamination is h1, the distance between the reference point of the radial magnet slot and the center of the rotor lamination is h2, and the depth to which the permanent magnet used to install in the first tangential magnet slot is embedded in the rotor core is H. 切向 =R-h1, where the depth of the permanent magnet embedded in the rotor core for mounting in the radial magnet slot is H. 径向 =R-h2, where R is the radius of the rotor lamination, and H... 切向 =21.602mm, H 径向 =9.502mm.

13. A rotor, characterized in that, It includes a rotor core, which is formed by stacking rotor laminations along the axial direction of the rotor as described in any one of claims 1 to 12.

14. An electric motor, characterized in that, Includes the rotor as described in claim 13.

15. An electrical appliance, characterized in that, Including the motor as described in claim 14.

Images