Rotor, electric machine and compressor

Abstract

This disclosure relates to a rotor, an electric motor, and a compressor. The rotor includes a rotor core, a plurality of rare-earth permanent magnets, and a plurality of ferrite permanent magnets. The rotor core includes a plurality of core units arranged sequentially along the circumference of the rotor core. Each core unit has two first mounting slots and one second mounting slot arranged circumferentially at intervals. The first mounting slots have openings located on the outer circumferential surface of the core unit. The second mounting slots are located between the two first mounting slots and opposite to the side of the first mounting slots away from the opening. The plurality of rare-earth permanent magnets are fixed one-to-one in all the first mounting slots; the plurality of ferrite permanent magnets are fixed one-to-one in all the second mounting slots. This disclosure can improve motor performance by increasing the amount of inexpensive ferrite permanent magnets while reducing the amount of rare-earth materials used, thereby balancing motor performance and cost.

Description

Technical Field

[0001] This disclosure relates to the field of motor technology, and in particular to a rotor, motor and compressor. Background Technology

[0002] With the rapid development of technology, permanent magnet synchronous motors have been widely used in compressors and other fields due to their advantages such as small size, light weight and high efficiency.

[0003] In related technologies, in order to improve the performance of permanent magnet synchronous motors, the permanent magnets in the rotor are often made entirely of rare earth permanent magnet materials.

[0004] Due to the high cost of rare-earth permanent magnet materials, the manufacturing cost of the aforementioned permanent magnet synchronous motors is relatively high. How to balance the performance and cost of permanent magnet synchronous motors has become an urgent problem to be solved. Summary of the Invention

[0005] This disclosure provides a rotor, a motor, and a compressor, which can solve the aforementioned technical problems existing in related technologies. The technical solution is as follows:

[0006] In a first aspect, a rotor is provided, the rotor comprising a rotor core, a plurality of rare earth permanent magnets and a plurality of ferrite permanent magnets;

[0007] The rotor core includes a plurality of core units arranged sequentially along the circumference of the rotor core. Each core unit has two first mounting slots and one second mounting slot arranged at intervals along the circumference. The first mounting slot has an opening located on the outer circumferential surface of the core unit. The second mounting slot is located between the two first mounting slots and is opposite to the side of the first mounting slot away from the opening.

[0008] Multiple rare-earth permanent magnets are fixed one-to-one in all the first mounting slots;

[0009] The ferrite permanent magnets are fixed one-to-one in all the second mounting slots.

[0010] In one possible implementation, two adjacent rare-earth permanent magnets in two adjacent core units are parallel.

[0011] In one possible implementation, the first mounting slot includes a first portion and a second portion connected together, the second portion being located on the side of the first portion away from the opening, and the rare earth permanent magnet being located within the first portion.

[0012] In one possible implementation, the distance between the second part and the second mounting groove is d, where 0.5mm ≤ d ≤ 0.8mm.

[0013] In one possible implementation, the first portion has a dimension of t1 in the circumferential direction, and the opening has a dimension of t2 in the circumferential direction, where t1-1mm≤t2≤t1-0.5mm.

[0014] In one possible implementation, the first portion has a circumferential dimension of t1, and the second mounting slot has a radial dimension of t3 in the rotor core, where 2t1≤t3≤5t1.

[0015] In one possible implementation, the outer peripheral surface of the core unit has two strip-shaped grooves, which are arranged at circumferential intervals along the rotor core.

[0016] In one possible implementation, the rotor core comprises P core units, and the angle between the two shortest lines connecting the two strip slots to the central axis of the rotor core is A, where 0.5 ≤ A*P / 360° ≤ 0.7.

[0017] In one possible implementation, the outer peripheral surface of the core unit is cylindrical, and the outer peripheral surfaces of multiple core units are not coaxial.

[0018] In a second aspect, an electric motor is provided, the motor comprising the rotor provided in the first aspect and its possible implementations.

[0019] Thirdly, a compressor is provided, the compressor including the motor provided in the second aspect and its possible implementations.

[0020] The beneficial effects of the technical solution provided in this disclosure include at least the following:

[0021] In this disclosure, ferrite permanent magnets are distributed between two rare-earth permanent magnets, forming an auxiliary magnetic circuit with the rare-earth permanent magnets. This increases the magnetic flux between the stator and rotor. Furthermore, the ferrite permanent magnets also create magnetic reluctance, preventing the magnetic circuit of the rare-earth permanent magnets from directly guiding to the rotor yoke, thereby reducing motor leakage flux and significantly improving motor efficiency. Thus, this disclosure can maintain motor performance while reducing the amount of rare-earth materials and increasing the use of inexpensive ferrite permanent magnets, achieving a balance between motor performance and cost.

[0022] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a rotor provided in an embodiment of this disclosure;

[0025] Figure 2 This is a partial structural schematic diagram of a rotor provided in an embodiment of this disclosure;

[0026] Figure 3 This is a schematic diagram of the structure of an electric motor provided in an embodiment of this disclosure;

[0027] Figure 4 This is a schematic diagram of the magnetic flux of an electric motor provided in an embodiment of this disclosure.

[0028] Figure label:

[0029] 1. Rotor core;

[0030] 11. First mounting slot; 111. Opening; 11a. First part; 11b. Second part;

[0031] 12. Second mounting slot; 13. Strip groove; 14. Connecting rib; 15. Rotor yoke; 16. Rivet hole;

[0032] 2. Rare earth permanent magnets;

[0033] 3. Ferrite permanent magnets;

[0034] S, iron core unit;

[0035] 4. Stator core; 41. Stator yoke; 42. Stator teeth;

[0036] 5. Windings. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other. This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] In related technologies, in order to improve the performance of permanent magnet synchronous motors, the permanent magnets in the rotor are often made entirely of rare earth permanent magnet materials.

[0040] However, due to the high cost of rare-earth permanent magnet materials, the manufacturing cost of the aforementioned permanent magnet synchronous motors is relatively high. How to balance the performance and cost of permanent magnet synchronous motors has become an urgent problem to be solved.

[0041] To address the problems existing in related technologies, this disclosure provides a rotor, such as... Figure 1 As shown, the rotor includes a rotor core 1, multiple rare-earth permanent magnets 2, and multiple ferrite permanent magnets 3. Figure 2 As shown, the rotor core 1 includes multiple core units S arranged sequentially along the circumference of the rotor core 1. Each core unit S has two first mounting slots 11 and one second mounting slot 12 arranged circumferentially. The first mounting slot 11 has an opening 111 located on the outer circumferential surface of the core unit S. The second mounting slot 12 is located between the two first mounting slots 11 and is opposite to the side of the first mounting slot 11 away from the opening 111. Figure 1 and Figure 2 As shown, multiple rare earth permanent magnets 2 are fixed in all the first mounting slots 11 in a one-to-one correspondence, and multiple ferrite permanent magnets 3 are fixed in all the second mounting slots 12 in a one-to-one correspondence.

[0042] The rotor provided in this embodiment has ferrite permanent magnets 3 distributed between two rare-earth permanent magnets 2, forming an auxiliary magnetic circuit with the edges of the rare-earth permanent magnets 2. This increases the magnetic flux between the stator and rotor. Furthermore, the ferrite permanent magnets 3 also create magnetic reluctance, preventing the magnetic circuit of the rare-earth permanent magnets 2 from directly guiding to the rotor yoke 15, thereby reducing motor leakage flux and significantly improving motor performance. While the permanent magnets in the second mounting slot 12 can also be rare-earth permanent magnets, using ferrite permanent magnets achieves better results and offers higher cost-effectiveness. Therefore, the motor provided in this embodiment can achieve good performance while reducing the amount of rare-earth materials and increasing the amount of inexpensive ferrite permanent magnets 3, thus balancing motor performance and cost.

[0043] Furthermore, in this embodiment, the first mounting groove 11 has an opening 111 located on the outer peripheral surface of the core unit S, meaning the first mounting groove 11 communicates with the air gap between the stator and rotor. This increases the magnetic resistance at the end of the first mounting groove 11 near the outer peripheral surface in the core unit S, thereby preventing the magnetic circuit from being directly guided from the stator core 4 to the air gap between the stator and rotor. It also prevents the rare-earth permanent magnet 2 from forming a closed magnetic circuit directly through the portion of the rotor core 1 near the outer peripheral surface. Therefore, the rotor provided in this embodiment reduces magnetic leakage between the rare-earth permanent magnet 2 at that end and the portion of the rotor core 1 near the outer peripheral surface, thus significantly improving motor efficiency.

[0044] Among them, the magnetic poles of the two rare earth permanent magnets 2 in the same iron core unit S are in the same direction and are distributed along the circumference of the rotor iron core 1, while the direction of the ferrite permanent magnet 3 is distributed along the radial direction of the rotor iron core 1.

[0045] Optional, such as Figure 2 As shown, each core unit S has a planar symmetrical structure, and one of the core units S is symmetrical about plane M, which passes through the axis of rotor core 1.

[0046] Optional, such as Figure 2 As shown, each core unit S has a planar symmetrical structure, and the cross-section of the second mounting groove 12 is quadrilateral. For example, the cross-section of the second mounting groove 12 is rectangular or isosceles trapezoidal.

[0047] Optionally, the rare-earth permanent magnet 2 is made of neodymium iron boron permanent magnet, and the ferrite permanent magnet 3 is made of a composite oxide composed of iron oxide (such as iron(II,III) oxide) and one or more other metal oxides. The specific materials of the rare-earth permanent magnet 2 and the ferrite permanent magnet 3 are determined by the specific operating conditions of the motor, and this embodiment does not limit them.

[0048] Optionally, the rotor core 1 is formed by stacking multiple silicon steel laminations.

[0049] In this way, compared with the direct injection molding method, the eddy current loss and hysteresis loss in the rotor core 1 can be reduced, thereby greatly improving the efficiency of the motor.

[0050] Furthermore, such as Figure 2 As shown, each core unit S has a rivet hole 16, which is located between two first mounting slots 11 and on the side of the second mounting slot 12 near the outer circumference of the rotor core 1. The rivet hole 16 is mainly used for rivets to pass through in order to reinforce the rotor core 1 after multiple silicon steel laminations are stacked.

[0051] This improves the stability of the rotor during motor operation, thereby extending the rotor's service life.

[0052] Optionally, the rare earth permanent magnet 2, the ferrite permanent magnet 3 and the rotor core 1 are directly inserted into the first mounting slot 11 and the second mounting slot 12.

[0053] Optionally, the rotor also includes a shaft, and the rotor core 1 has a shaft hole, through which the shaft passes to drive the shaft to rotate.

[0054] Furthermore, at least one hole wall in the shaft hole is a plane.

[0055] This prevents the connection between the shaft and the rotor core 1 from becoming loose, which could lead to relative movement between the shaft and the rotor core 1, thus ensuring the stability of the motor operation.

[0056] Furthermore, of the four hole walls of the shaft hole, two hole walls are flat and opposite to each other, while the other two hole walls are curved and opposite to each other.

[0057] The rotor provided in the embodiments of this disclosure will now be described in detail with reference to some examples.

[0058] In some examples, such as Figure 1 As shown, the two adjacent rare-earth permanent magnets 2 in two adjacent iron core units S are parallel.

[0059] In this design, the rare-earth permanent magnets 2 within two adjacent core units S jointly provide magnetic flux to the air gap. This increases the air gap magnetic flux density of the motor, thereby increasing the motor's torque density and material utilization, and reducing the motor's material cost. Furthermore, the equal distance between the rare-earth permanent magnets 2 within two adjacent core units S ensures that the magnetic flux is evenly distributed between them.

[0060] Furthermore, in this embodiment, a single iron core unit S has two rare-earth permanent magnets 2. With this arrangement, the pole length of a single iron core unit S can be reduced, thereby reducing the cogging torque of the motor and improving the efficiency of the motor.

[0061] Optionally, the two adjacent rare-earth permanent magnets 2 in two adjacent core units S are parallel to the connection surface between the two core units S.

[0062] In some examples, such as Figure 2 As shown, the first mounting groove 11 includes a first part 11a and a second part 11b connected together. The second part 11b is located on the side of the first part 11a away from the opening 111, and is combined with... Figure 1 It can be observed that the rare earth permanent magnet 2 is located within the first part 11a.

[0063] In this way, the second part 11b is hollow, and it has a larger magnetic resistance compared to the solid part of the rotor core 1. The connecting rib 14 between the first mounting groove 11 and the second mounting groove 12 can guide the direction of the magnetic circuit, so that the magnetic circuit can pass from the connecting rib 14 to the ferrite permanent magnet 3 in the second mounting groove 12. That is, it can prevent the magnetic circuit from directly passing to the rotor yoke 15, thereby reducing the leakage flux of the motor and improving the efficiency of the motor.

[0064] The second mounting groove 12 is located between the first part 11a of the two first mounting grooves 11, and the other part of the second mounting groove 12 is located between the second part 11b of the two first mounting grooves 11. The second part 11b and the second mounting groove 12 are connected by a connecting rib 14.

[0065] Optional, such as Figure 2As shown, the first mounting groove 11 also includes a third part, which is connected to the first part 11a and is located on the side of the first part 11a away from the second part 11b. The third part has a smaller dimension in the circumferential direction of the rotor core 1 than the first part 11a in the circumferential direction of the rotor core 1. The third part is hollow and has an opening 111 at the end away from the first part 11a.

[0066] Thus, combined Figure 1 As shown, this can further prevent the rare earth permanent magnet 2 from approaching one end of the outer peripheral surface of the rotor core 1, thus preventing the formation of a closed magnetic circuit through the part of the rotor core 1 near the outer peripheral surface. Furthermore, it can further prevent the magnetic circuit from directly connecting the rotor core 1 to the air gap between the stator and rotor, thereby reducing the leakage magnetic flux between that end of the rare earth permanent magnet 2 and the part of the rotor core 1 near the outer peripheral surface, and thus greatly improving the efficiency of the motor.

[0067] Optional, such as Figure 2 As shown, the second part 11b is parallel to the inner wall of the second mounting groove 12.

[0068] In some examples, such as Figure 2 As shown, the distance between the second part 11b and the second mounting groove 12 is d, 0.5mm≤d≤0.8mm.

[0069] Here, d represents the dimension of the connecting rib 14 in the circumferential direction of the rotor core 1. If the value of d is too small, the guiding effect of the connecting rib 14 on the magnetic circuit will be poor, making it difficult to guide the magnetic circuit to the magnetic poles of the ferrite permanent magnet 3 through the connecting rib 14. Furthermore, it will also lead to greater manufacturing difficulty for the rotor core 1. If the value of d is too large, it may cause the magnetic circuit to be directly guided from the connecting rib 14 to the rotor yoke 15, which may lead to increased leakage flux in the motor. Setting d within this range can reduce the manufacturing difficulty of the rotor while ensuring the efficiency of the motor.

[0070] Optionally, the value of d can be 0.55mm, 0.60mm, 0.65mm, 0.70mm or 0.75mm.

[0071] In some examples, such as Figure 2 As shown, the circumferential dimension of the first part 11a is t1, and the circumferential dimension of the opening 111 is t2, where t1-1mm≤t2≤t1-0.5mm.

[0072] If t2 is too large, the structural strength of the first mounting slot 11 will be poor. During motor operation, the rare earth permanent magnet 2 may damage the opening 111 and detach from the first mounting slot 11. If t2 is too small, on the one hand, the magnetic resistance at the opening 111 will be too small, which is not conducive to reducing the leakage magnetic flux of the rare earth permanent magnet 2 in the air gap between the stator and rotor. On the other hand, it will be inconvenient for production and processing. Setting t2 within this range can ensure the structural strength of the rotor and prevent excessive leakage magnetic flux, thereby effectively improving the efficiency of the motor.

[0073] Optionally, t1 can be 1.5mm, and t2 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1.0mm.

[0074] In some examples, such as Figure 2 As shown, the first part 11a has a circumferential dimension of t1, and the second mounting groove 12 has a radial dimension of t3 in the rotor core 1, where 2t1≤t3≤5t1.

[0075] If the value of t3 is too large, the size of the ferrite permanent magnet 3 in the second mounting slot 12 will be too large. Since the ferrite permanent magnet 3 can effectively form a magnetic circuit with the rare earth permanent magnet 2 within a certain size range, an excessively large size will lead to a serious waste of ferrite material, thus increasing the material cost of the rotor. If the value of t3 is too small, the size of the ferrite permanent magnet 3 will be too small, resulting in poor performance and potentially causing significant leakage flux between the rare earth permanent magnet 2 and the rotor yoke 15. Setting t3 within this range ensures both motor efficiency and avoids material waste of the ferrite permanent magnet 3.

[0076] Optionally, t1 can be 1.5mm, and t3 can be 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm, or 7.0mm.

[0077] In some examples, such as Figure 2 As shown, the outer peripheral surface of the core unit S has two strip-shaped grooves 13, which are arranged at intervals along the circumference of the rotor core 1.

[0078] Each core unit S is used to form a magnetic pole of the rotor. By setting two strip grooves 13 on the outer circumferential surface of the core unit S, the pole amplitude length of each pole of the rotor can be reduced, thereby reducing the cogging torque of the motor and improving the efficiency of the motor.

[0079] The fewer the number of core units S in the rotor core 1 (such as 6 or 8), the fewer the number of poles of the rotor and the greater the cogging torque. By having two strip grooves 13 on the outer circumference of the core unit S, the cogging torque of the motor can be effectively reduced and the efficiency of the motor can be improved when the cogging torque is large.

[0080] Optionally, the cross-section of the strip groove 13 is arc-shaped, and the radius of the arc is R, 0.8mm≤R≤1.5mm.

[0081] If R is too large, it will increase the air gap between the stator and rotor, resulting in excessive air gap magnetic flux density of the motor and thus reducing the efficiency of the motor; if R is too small, the size of the strip groove 13 will be too small, and its effect on reducing cogging torque will be limited.

[0082] Optionally, the value of R can be 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm or 1.4mm, and its specific value is determined by the application requirements of the motor. This disclosure does not impose any restrictions on it.

[0083] In some examples, the rotor core 1 comprises P core units S, such as... Figure 2 As shown, the angle between the shortest line connecting the two strip slots 13 and the central axis of the rotor core 1 is A, and 0.5≤A*P / 360°≤0.7.

[0084] If A is too large or too small, the cogging torque of the motor will increase instead of decrease. Setting A within this range can effectively ensure that the two strip slots 13 reduce the cogging torque of the motor, thereby ensuring the efficiency of the motor.

[0085] Optionally, when P is 6, A can be 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, or 40°. The value of A can be determined based on the specific application requirements of the motor and the relevant structure of the stator, but the range of values ​​for A is within this range.

[0086] In some examples, the outer peripheral surface of the core unit S is cylindrical, and the outer peripheral surfaces of multiple core units S are not coaxial.

[0087] In this way, the air gap between the rotor and the stator is non-uniformly distributed, which can effectively optimize the air gap magnetic flux density waveform, improve the sinusoidal nature of the air gap magnetic flux density, and effectively optimize the electromotive force harmonics of the reverse motor, thereby reducing torque pulsation and ensuring that the motor can operate more smoothly and efficiently.

[0088] Optionally, the radius difference between the quadrature axis and the direct axis of the rotor core 1 is L, and the minimum length of the air gap between the motor stator and the rotor is L0, where L0≤2L≤3L0.

[0089] In some examples, the rotor provided by the present disclosure can reduce the amount of rare earth permanent magnets 2 by 25%-35% compared with the rotor using conventional rare earth permanent magnets 2, while maintaining the same motor performance, thereby achieving the goal of reducing motor material costs by 10%-15%.

[0090] Based on the same concept, this disclosure also provides a motor, such as... Figure 3 As shown, the motor includes the rotor provided above.

[0091] The motor also includes a stator, which comprises a stator core 4 and windings 5. The stator core 4 is sleeved on the outside of the rotor. The stator core 4 includes a stator yoke 41 and multiple stator teeth 42, which are connected to the stator yoke 41. Multiple windings 5 ​​are wound around the multiple stator teeth 42. When an alternating current is applied to the windings 5, the rotor can rotate under the action of electromagnetic induction, thereby driving the shaft to rotate.

[0092] Furthermore, in this embodiment of the present disclosure, the permanent magnets of adjacent magnetic poles of the motor rotor have opposite polarities, thereby forming a closed magnetic circuit with the rotor core 1, the radial air gap between the stator and rotor, and the stator core 4.

[0093] Among them, such as Figure 4 As shown, the specific main magnetic flux path inside the motor is: rare earth permanent magnet 2 → adjacent rotor core 1 → radial air gap between stator and rotor → stator core 4 → radial air gap between stator and rotor → adjacent rotor core 1 → rare earth permanent magnet 2.

[0094] The auxiliary magnetic flux path inside the motor is as follows: ferrite permanent magnet 3 → connecting rib 14 → adjacent rare earth permanent magnet 2 → connecting rib 14 → adjacent ferrite permanent magnet 3 → adjacent rotor core 1 → radial air gap between stator and rotor → stator core 4 → radial air gap between stator and rotor → adjacent rotor core 1 → ferrite permanent magnet 3.

[0095] When the stator winding 5 is energized according to a certain logic, the stator generates a rotating magnetic field under the above magnetic flux path, and the rotor rotates and outputs torque under the action of the rotating magnetic field generated by the stator.

[0096] Optionally, the stator is formed by stacking multiple silicon steel sheets.

[0097] In this way, compared with the direct injection molding method, the eddy current loss and hysteresis loss in the stator can be reduced, thereby greatly improving the efficiency of the motor.

[0098] Based on the same concept, this disclosure also provides a compressor, which includes the motor mentioned above.

[0099] The motor in a compressor often needs to run at high speed, combined with Figure 1 and Figure 2 As shown, the rotor core 1 of the motor typically has six or eight core units S. Due to the small number of core units S, the cogging torque of the motor is relatively large. By making two adjacent rare-earth permanent magnets 2 parallel in two adjacent core units S and setting two strip slots 13 on the outer circumference of the core unit S, the cogging torque of the motor can be effectively reduced, thereby reducing the torque pulsation of the motor and improving the stability of motor operation.

[0100] Optionally, the compressor can be used in electrical appliances such as air conditioners and refrigerators.

[0101] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0102] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0103] In the description of this disclosure, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this disclosure and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this disclosure; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0104] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0105] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this disclosure.

[0106] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A rotor, characterized in that, The rotor includes a rotor core (1), multiple rare earth permanent magnets (2) and multiple ferrite permanent magnets (3); The rotor core (1) includes a plurality of core units (S) arranged sequentially along the circumference of the rotor core (1). Each core unit (S) has two first mounting slots (11) and a second mounting slot (12) arranged at intervals along the circumference. The first mounting slot (11) has an opening (111) located on the outer circumferential surface of the core unit (S). The second mounting slot (12) is located between the two first mounting slots (11) and is opposite to the side of the first mounting slot (11) away from the opening (111). Multiple rare earth permanent magnets (2) are fixed in all the first mounting slots (11) in a one-to-one correspondence; Multiple ferrite permanent magnets (3) are fixed one-to-one in all the second mounting slots (12).

2. The rotor according to claim 1, characterized in that, The two adjacent rare earth permanent magnets (2) in the two adjacent iron core units (S) are parallel.

3. The rotor according to claim 1, characterized in that, The first mounting groove (11) includes a first part (11a) and a second part (11b) connected together, the second part (11b) being located on the side of the first part (11a) away from the opening (111), and the rare earth permanent magnet (2) being located within the first part (11a).

4. The rotor according to claim 3, characterized in that, The distance between the second part (11b) and the second mounting groove (12) is d, 0.5mm≤d≤0.8mm.

5. The rotor according to claim 3, characterized in that, The first part (11a) has a dimension of t1 in the circumferential direction, and the opening (111) has a dimension of t2 in the circumferential direction, where t1-1mm≤t2≤t1-0.5mm.

6. The rotor according to claim 3, characterized in that, The first part (11a) has a circumferential dimension of t1, and the second mounting groove (12) has a radial dimension of t3 in the rotor core (1), where 2t1≤t3≤5t1.

7. The rotor according to claim 1, characterized in that, The outer peripheral surface of the core unit (S) has two strip-shaped grooves (13), which are arranged at intervals along the circumference of the rotor core (1).

8. The rotor according to claim 7, characterized in that, The rotor core (1) includes P core units (S), and the angle between the two strip slots (13) and the shortest line connecting the central axis of the rotor core (1) is A, 0.5≤A*P / 360°≤0.

7.

9. The rotor according to claim 1, characterized in that, The outer peripheral surface of the core unit (S) is cylindrical, and the outer peripheral surfaces of multiple core units (S) are not coaxial.

10. An electric motor, characterized in that, The motor includes the rotor as described in any one of claims 1-9.

11. A compressor, characterized in that, The compressor includes the motor as described in claim 10.

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