Motor rotor assembly, motor and compressor

Abstract

The invention provides a motor rotor assembly, a motor and a compressor, the motor rotor assembly comprises a rotor core, the rotor core is provided with a plurality of magnetic poles, the magnetic poles are uniformly arranged at intervals along the circumferential direction of the rotor core, a first V-shaped magnetic steel groove is formed below each magnetic pole, and two first permanent magnets arranged in a V shape are arranged in each first V-shaped magnetic steel groove. Under any magnetic pole, the first V-shaped magnetic steel groove and the two first permanent magnets are symmetrical about the d axis of the magnetic pole, two second V-shaped magnetic steel grooves symmetrical about the d axis are further formed under each magnetic pole, and the two second V-shaped magnetic steel grooves are located at the radial outer ends of the two first permanent magnets respectively. A second permanent magnet and a third permanent magnet which are arranged in a V shape are arranged in each second V-shaped magnetic steel groove, and the third permanent magnet is located on the side, close to the d axis, of the second permanent magnet. The magnetic field intensity of the two circumferential sides of the magnetic pole close to the interelectrode position is realized on the premise of not excessively increasing the consumption cost of the magnetic steel, so that the performance of the motor is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor design, and in particular relates to a motor rotor assembly, a motor, and a compressor. Background Art

[0002] In the compressor motor rotor assembly in the related art, the rotor magnetic steel slots and the arrangement layout of the magnetic steel are mostly "I"-shaped or "V"-shaped. Due to the limited size of the rotor core, the "I"-shaped magnetic steel is less distributed, resulting in limited magnetic steel usage, and the corresponding motor magnetic density is limited, so the performance is poor. In order to improve the magnetic field of the motor rotor during operation, the motor magnetic field is usually improved by increasing the magnetic steel grade; the "V"-shaped magnetic steel is smaller in volume and more evenly distributed, and can increase the amount of magnetic steel under the premise of the same rotor core size, thereby improving the magnetic field strength and improving the motor performance. In order to be able to improve the magnetic density in the stator and rotor air gap and further improve the motor performance, the "V"-shaped magnetic steel slots and the radial outer end of the magnetic steel are arranged as close as possible to the outer circle of the rotor core in the related art. The inventor found that this treatment method causes serious magnetic leakage at the radial outer end of the V-shaped magnetic steel. Summary of the Invention

[0003] Therefore, the present invention provides a motor rotor assembly, a motor, and a compressor, which can overcome the technical problem in the related art of serious magnetic leakage at the radial outer end position of the V-shaped magnetic steel in the motor rotor with V-shaped magnetic steel slots.

[0004] In order to solve the above problems, the present invention provides a motor rotor assembly, including a rotor core, the rotor core having a plurality of magnetic poles, each of the magnetic poles being evenly spaced along the circumferential direction of the rotor core, a first V-shaped magnetic steel slot formed under each of the magnetic poles, two first permanent magnets arranged in a V shape being provided in each of the first V-shaped magnetic steel slots, under any magnetic pole, the first V-shaped magnetic steel slot and the two first permanent magnets being symmetrical about the d-axis of the magnetic pole, two second V-shaped magnetic steel slots being symmetrical about the d-axis are further formed under each of the magnetic poles, the two second V-shaped magnetic steel slots being within the opening range of the first V-shaped magnetic steel slot and respectively located at the radially outer ends of the two first permanent magnets, a second permanent magnet and a third permanent magnet arranged in a V shape being provided in each of the second V-shaped magnetic steel slots, wherein the third permanent magnet is located on the side of the second permanent magnet close to the d-axis.

[0005] In some embodiments, the second permanent magnet is parallel to the first permanent magnet corresponding to its position.

[0006] In some embodiments, a straight-line magnetic steel slot is further formed under each of the magnetic poles, a fourth permanent magnet is provided in the straight-line magnetic steel slot and is within the opening range of the first V-shaped magnetic steel slot, the straight-line magnetic steel slot and the fourth permanent magnet themselves are symmetrical about the d-axis, and the straight-line magnetic steel slot is located on the side of the third permanent magnet close to the center of the rotor core.

[0007] In some embodiments, two ends of the fourth permanent magnet and two of the third permanent magnets form an interlaced overlap in the direction of the d-axis.

[0008] In some embodiments, the fourth permanent magnet is parallel to the third permanent magnet.

[0009] In some embodiments, a third V-shaped magnetic steel slot is further formed under each of the magnetic poles, each of the third V-shaped magnetic steel slots is within the opening range of the first V-shaped magnetic steel slot and is symmetrical about the d axis, the third V-shaped magnetic steel slot is located on the side of the two third permanent magnets close to the outer circle of the rotor core, and two fifth permanent magnets arranged in a V shape are provided in the third V-shaped magnetic steel slot.

[0010] In some embodiments, the radial thickness of the first permanent magnet is d1, the radial thickness of the second permanent magnet is d2, the radial thickness of the third permanent magnet is d3, the radial thickness of the fourth permanent magnet is d4, and the radial thickness of the fifth permanent magnet is d5, d2=d5, d3=d4, d1>d2>d3.

[0011] In some embodiments, d1=1.77 mm to 1.83 mm, 1.27 mm≤d2=d5≤1.33 mm, and 1.07 mm≤d3=d5≤1.13 mm.

[0012] In some embodiments, the V-shaped angle of the first V-shaped magnetic steel groove is φ3, the V-shaped angle of the second V-shaped magnetic steel groove is φ1, and the V-shaped angle of the third V-shaped magnetic steel groove is φ2, φ1>φ3, φ2>φ3.

[0013] In some embodiments, φ1=φ2=144.5° to 145.5°, φ3=109.5° to 110.5°.

[0014] In some embodiments, the minimum distance between the first V-shaped magnetic steel slot and the center of the rotor core is H, the minimum spacing between the two second V-shaped magnetic steel slots is H2, the minimum spacing between the second V-shaped magnetic steel slot and the I-shaped magnetic steel slot is H1, and the maximum spacing between the radial outer slot wall of the third V-shaped magnetic steel slot and the outer circle of the rotor core is H3, H=15.45mm~15.55mm, H1=0.98mm~1.04mm, H2=2.48mm~2.54mm, H3=2.78mm~2.84mm.

[0015] In some embodiments, an interpolar groove is provided on the outer circle of the rotor core between two adjacent magnetic poles, and the interpolar groove passes through the axial ends of the rotor core along the axial direction of the rotor core. The interpolar groove is a flared shape that gradually expands outward along the radial direction of the rotor core, and the interpolar groove is symmetrical about the q axis corresponding to its position. The groove depth of the interpolar groove is 0.57mm~0.63mm, the groove width of the interpolar groove is q1, and the groove bottom width of the interpolar groove is q2, 5.8mm≤q2≤6.2mm, 8mm≤q1≤8.4mm.

[0016] The present invention also provides a motor, comprising the motor rotor assembly described above.

[0017] The present invention also provides a compressor comprising the above-mentioned motor rotor assembly.

[0018] The motor rotor assembly, motor, and compressor provided by the present invention have the following beneficial effects:

[0019] Providing a second V-shaped magnetic steel slot at the radial outer end of each of the first V-shaped magnetic steel slots can locally increase the magnetic flux density at the radial outer end where the magnetic leakage of the first permanent magnet is more serious, and objectively achieves an increase in the magnetic steel thickness at the radial outer end of the first permanent magnet, without increasing the thickness of the first permanent magnet over the entire length range, and achieves the magnetic field strength at the circumferential sides of the magnetic pole close to the inter-pole position without excessively increasing the cost of magnetic steel usage, thereby improving the performance of the motor; at the same time, since the second permanent magnet is provided at the end position of the first permanent magnet closest to the outer circle of the rotor core, it can also effectively improve the anti-demagnetization ability of the outer end of the first permanent magnet, and the second permanent magnet and the third permanent magnet arranged in a V-shape in the second V-shaped magnetic steel slots on both sides can further enhance the magnetic field concentration effect of the magnetic pole, thereby increasing the back electromotive force of the motor and reducing the copper loss of the motor, thereby achieving the effect of improving the efficiency of the motor;

[0020] Within the opening range of the first V-shaped magnetic steel slot and on the side of the third permanent magnet close to the center of the rotor core, on the one hand, the magnetic field strength near the d-axis can be effectively increased, thereby increasing the magnetic flux density in the stator-rotor air gap and thus improving the motor performance. On the other hand, since the magnetic field strength at the radial inner end of the first permanent magnet is increased, the magnetic field strength across the entire magnetic pole is more uniform.

[0021] The staggered overlap of the ends of the fourth permanent magnet and the third permanent magnet on the d-axis can further achieve reasonable utilization of the physical structure within the V-shaped magnetic pole range of the rotor core;

[0022] A third V-shaped magnetic steel slot is also provided under the magnetic pole so that the permanent magnets in the same magnetic pole form a symmetrical arrangement structure of four V-shapes + one line, which can further optimize the air gap magnetic density, improve the utilization rate of the magnetic steel, enhance the balance of motor operation, and make the motor air gap magnetic density sinusoidally distributed (that is, improve the distribution sinusoidality of the air gap magnetic density), thereby improving the motor operation efficiency and improving the output torque capacity of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. The drawings described below are merely exemplary. Those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0024] Figure 1 1 is a schematic structural diagram (axial projection) of a motor rotor assembly according to an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle;

[0026] Figure 3 yes Figure 1 Schematic diagram of the partial structure of the rotor core;

[0027] Figure 4 yes Figure 1 Schematic diagram of the partial structure of the rotor core;

[0028] Figure 5 1 is a schematic structural diagram of a motor in an embodiment of the present invention (axial projection, showing only the rotor core and the stator core);

[0029] Figure 6 is a back electromotive force waveform diagram of a motor whose motor rotor assembly does not adopt the technical solution of the present invention;

[0030] Figure 7 This is a back electromotive force waveform diagram of a motor using the motor rotor assembly of the technical solution of the present invention;

[0031] Figure 8 This is a comparison chart of the motor efficiency of the original motor (not adopting the technical solution of the present invention) and the motor of the present invention;

[0032] Figure 9 It is a comparison chart of the motor iron loss of the original motor (not adopting the technical solution of the present invention) and the motor of the present invention.

[0033] The accompanying drawings are:

[0034] 1. Rotor core; 11. First V-shaped magnetic steel slot; 12. Second V-shaped magnetic steel slot; 13. I-shaped magnetic steel slot; 14. Third V-shaped magnetic steel slot; 15. Interpolar groove; 21. First permanent magnet; 22. Second permanent magnet; 23. Third permanent magnet; 24. Fourth permanent magnet; 25. Fifth permanent magnet; 3. Stator core. DETAILED DESCRIPTION

[0035] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0037] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90° or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0038] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0039] See also Figures 1 to 9 As shown, according to an embodiment of the present invention, a motor rotor assembly is provided, including a rotor core 1 (formed by stacking a plurality of rotor punchings), the rotor core 1 having a plurality of magnetic poles, each of the magnetic poles being evenly spaced along the circumferential direction of the rotor core 1, a first V-shaped magnetic steel slot 11 being formed under each of the magnetic poles, and two first permanent magnets 21 arranged in a V shape being disposed in each of the first V-shaped magnetic steel slots 11, under any magnetic pole, the first V-shaped magnetic steel slot 11 and the two first permanent magnets 21 are aligned with respect to the d-axis of the magnetic pole (see FIG. Figure 1 As shown in the figure, two second V-shaped magnetic steel slots 12 are symmetrical about the d-axis under each magnetic pole, and the two second V-shaped magnetic steel slots 12 are located within the opening range of the first V-shaped magnetic steel slot 11. The openings of the first V-shaped magnetic steel slot 11 and the second V-shaped magnetic steel slot 12 are both facing the outer circle of the rotor core 1, and the two second V-shaped magnetic steel slots 12 are located in the first V-shaped magnetic steel slot 11 and are respectively located at the radial outer end position of the two first permanent magnets 21 (that is, the end where the two first permanent magnets 21 are away from each other). Each second V-shaped magnetic steel slot 12 is provided with a second permanent magnet 22 and a third permanent magnet 23 arranged in a V shape, wherein the third permanent magnet 23 is located on the side of the second permanent magnet 22 close to the d-axis.

[0040] In this technical solution, a second V-shaped magnetic steel slot 12 is respectively provided at the radial outer end position of the first V-shaped magnetic steel slot 11, which can locally improve the magnetic density at the radial outer end position where the magnetic leakage of the first permanent magnet 21 is more serious, and objectively achieves an increase in the magnetic steel thickness at the radial outer end position of the first permanent magnet 21, without increasing the thickness of the first permanent magnet 21 over the entire length range, and achieves the magnetic field strength at the circumferential sides of the magnetic pole close to the inter-pole position without increasing the cost of magnetic steel too much, thereby improving the performance of the motor; at the same time, since the second permanent magnet 22 is provided at the end position of the first permanent magnet 21 closest to the outer circle of the rotor core 1, it can also effectively improve the anti-demagnetization ability of the outer end of the first permanent magnet 21, and the second permanent magnet 22 and the third permanent magnet 23 arranged in a V-shape in the second V-shaped magnetic steel slots 12 on both sides can further enhance the magnetic field concentration effect of the magnetic pole, increase the motor back electromotive force, reduce the motor copper loss, and achieve the effect of improving the motor efficiency.

[0041] In some embodiments, the second permanent magnet 22 is parallel to the first permanent magnet 21 corresponding to the second permanent magnet 22 .

[0042] In this technical solution, the second permanent magnet 22 and the first permanent magnet 21 are arranged in parallel and spaced apart, which can make rational use of the limited space of the rotor core 1 in the magnetic pole. While ensuring the structural strength of the rotor core 1, the amount of the second permanent magnet 22 is guaranteed, ensuring the effective improvement of the magnetic steel strength.

[0043] In some embodiments, a straight magnetic steel slot 13 is further formed under each of the magnetic poles, and a fourth permanent magnet 24 is provided in the straight magnetic steel slot 13 and is located within the opening range of the first V-shaped magnetic steel slot 11. The straight magnetic steel slot 13 and the fourth permanent magnet 24 themselves are symmetrical about the d-axis (that is, the d-axis of the magnetic pole with the corresponding position), and the straight magnetic steel slot 13 is located on the side of the third permanent magnet 23 close to the center of the rotor core 1.

[0044] In this technical solution, within the opening range of the first V-shaped magnetic steel slot 11 and on the side of the third permanent magnet 23 close to the center of the rotor core 1, on the one hand, it can effectively improve the magnetic field strength near the d-axis, increase the magnetic density in the stator and rotor air gap, and thus improve the motor performance; on the other hand, since the magnetic field strength of the radial inner end of the first permanent magnet 21 is improved, the magnetic field strength on the entire magnetic pole is more uniform.

[0045] In some embodiments, the two ends of the fourth permanent magnet 24 and the two third permanent magnets 23 form an interlaced overlap in the direction of the d-axis. Figure 1 As shown, one end of the third permanent magnet 23 close to the d-axis and two ends of the fourth permanent magnet 24 are respectively staggered.

[0046] In this technical solution, the fourth permanent magnet 24 and the end portions of the third permanent magnet 23 form an interlaced overlap on the d-axis, which can further achieve reasonable utilization of the physical structure within the V-shaped magnetic pole range of the rotor core 1.

[0047] As a preferred implementation, the fourth permanent magnet 24 is parallel to the third permanent magnet 23 , so that the lengths of the fourth permanent magnet 24 and the third permanent magnet 23 can be set to be relatively long to increase the magnetic field strength in the magnetic pole.

[0048] In some embodiments, a third V-shaped magnetic steel slot 14 is further formed under each of the magnetic poles. Each of the third V-shaped magnetic steel slots 14 is within the opening range of the first V-shaped magnetic steel slot 11 and is symmetrical about the d axis. The third V-shaped magnetic steel slot 14 is located on the side of the two third permanent magnets 23 close to the outer circle of the rotor core 1. Two fifth permanent magnets 25 arranged in a V shape are provided in the third V-shaped magnetic steel slot 14.

[0049] In this technical solution, a third V-shaped magnetic steel slot 14 is further provided under the magnetic pole so that the permanent magnets in the same magnetic pole form a symmetrical arrangement structure of four V-shapes + one line, which can further optimize the air gap magnetic density, improve the utilization rate of the magnetic steel, enhance the balance of motor operation, and make the air gap magnetic density of the motor sinusoidally distributed (that is, improve the distribution sinusoidality of the air gap magnetic density), thereby improving the motor operation efficiency and improving the output torque capacity of the motor.

[0050] In some embodiments, the radial thickness of the first permanent magnet 21 is d1, the radial thickness of the second permanent magnet 22 is d2, the radial thickness of the third permanent magnet 23 is d3, the radial thickness of the fourth permanent magnet 24 is d4, and the radial thickness of the fifth permanent magnet 25 is d5, d2=d5, d3=d4, d1>d2>d3. In a specific embodiment, d1=1.77mm~1.83mm, 1.27mm≤d2=d5≤1.33mm, 1.07mm≤d3=d5≤1.13mm.

[0051] In some embodiments, the V-shaped angle of the first V-shaped magnetic steel groove 11 is φ3, the V-shaped angle of the second V-shaped magnetic steel groove 12 is φ1, and the V-shaped angle of the third V-shaped magnetic steel groove 14 is φ2, φ1>φ3, φ2>φ3. In a specific embodiment, φ1=φ2=144.5°~145.5°, φ3=109.5°~110.5°. In some embodiments, the minimum distance between the first V-shaped magnetic steel slot 11 and the center of the rotor core 1 is H, the minimum spacing between the two second V-shaped magnetic steel slots 12 is H2, the minimum spacing between the second V-shaped magnetic steel slot 12 and the I-shaped magnetic steel slot 13 is H1, and the maximum spacing between the radial outer slot wall of the third V-shaped magnetic steel slot 14 and the outer circle of the rotor core 1 is H3, H=15.45mm~15.55mm, H1=0.98mm~1.04mm, H2=2.48mm~2.54mm, H3=2.78mm~2.84mm.

[0052] This technical solution defines the angle between each V-shaped magnetic steel slot and the spacing between them, further optimizing the air gap flux density, enhancing magnetic field strength, improving demagnetization resistance, and increasing motor operating efficiency. The specific lengths of the aforementioned permanent magnets can be appropriately selected based on practical needs, with the principle of avoiding physical interference being the fundamental premise, and are not specifically limited in this invention.

[0053] In some embodiments, an interpolar groove 15 is provided on the outer circle of the rotor core 1 between two adjacent magnetic poles, and the interpolar groove 15 passes through the axial ends of the rotor core 1 along the axial direction of the rotor core 1. The interpolar groove 15 is a flared shape that gradually expands outward along the radial direction of the rotor core 1, and the interpolar groove 15 is symmetrical about the q axis corresponding to its position. The groove depth of the interpolar groove 15 is 0.57 mm to 0.63 mm, the groove width of the interpolar groove 15 is q1, and the groove bottom width of the interpolar groove 15 is q2, 5.8 mm ≤ q2 ≤ 6.2 mm, 8 mm ≤ q1 ≤ 8.4 mm.

[0054] In this technical solution, by setting an interpole groove 15 symmetrical about the q-axis at the interpole position and designing the aforementioned interpole groove 15 as a flared structure, the q-axis magnetic resistance of the motor rotor can be significantly improved, the direction of the magnetic circuit can be modified, and the interpole leakage magnetic flux can be reduced, which is conducive to a better magnetic concentration effect, thereby increasing the motor back electromotive force and reducing the motor iron loss, thereby achieving the effect of improving the motor efficiency.

[0055] See also Figure 6 and Figure 7 As shown, Figure 6 is a back electromotive force waveform diagram of a motor whose motor rotor assembly does not adopt the technical solution of the present invention, Figure 7This is a back electromotive force waveform diagram of a motor using the motor rotor assembly of the technical solution of the present invention, according to Figure 6 、 Figure 7 From the back EMF waveform diagram, the back EMF waveform of the present invention is better than the original motor waveform. The sinusoidality of the back EMF waveform of the present invention better meets expectations, which helps to achieve lower noise, vibration and loss, provide smoother torque output and higher efficiency and precision.

[0056] See also Figure 8 and Figure 9 As shown, Figure 8 This is a comparison chart of the motor efficiency of the original motor (not adopting the technical solution of the present invention) and the motor of the present invention. Figure 9 1 is a comparison chart of the motor iron loss of the original motor (not adopting the technical solution of the present invention) and the motor of the present invention. It should be noted that the original motor referred to in the present invention refers to a motor having only the first V-shaped magnetic steel slot 11 and the first permanent magnet 21 arranged in a V shape, while the motor in the present invention refers to a motor having the aforementioned first V-shaped magnetic steel slot 11, the second V-shaped magnetic steel slot 12, the straight magnetic steel slot 13 and the third V-shaped magnetic steel slot 14 and the permanent magnets in each magnetic steel slot. Under the working conditions of the same current and the same motor output tangential torque, the motor iron loss of the motor of the present invention at each frequency is lower than that of the original motor (such as Figure 9 As shown), the output torque and copper loss are the same, the motor of the present invention optimizes the air gap flux density and thus improves the motor efficiency (as shown Figure 8 ), the anti-demagnetization ability is also improved (the original motor permanent magnet demagnetization to 5% requires an applied current of 25A, while the permanent magnet demagnetization to 5% in the present invention requires an applied current of 33A).

[0057] It should be noted that, in the present invention, the design of the first permanent magnet 21 is to normally control the direction of the magnetic pole magnetic circuit, so that its magnetic circuit is better directed to the stator winding, reduce the severity of leakage flux, ensure uniform distribution of magnetic flux density, reduce higher harmonic content and enhance operational balance; the design of the second permanent magnet 22 enhances the magnetic properties of the end of the magnet at an angle in the q-axis direction, optimizes the leakage flux problem, and prevents the magnet from being demagnetized due to excessive temperature during motor operation, thereby affecting the motor efficiency and motor service life; the third permanent magnet 23 is at an angle to the second permanent magnet 22, and the design of adding the fourth permanent magnet 24 enhances the magnetic properties of the magnetic pole in the d-axis direction, which can further achieve the effect of magnetic concentration, thereby reducing the harmonic content of the motor and improving the motor efficiency; the design of the fifth permanent magnet 25 enhances the magnetic properties of the rotor outer diameter edge pole in the d-axis direction, so that the motor increases the magnetic flux density, helps to reduce energy loss, and improves the output power and torque density of the motor, and the added magnet at the rotor edge has a certain synchronization effect with the second permanent magnet 22, thereby preventing the magnet from being demagnetized due to excessive temperature during motor operation, thereby affecting the motor efficiency.

[0058] According to an embodiment of the present invention, a motor is also provided, in particular a permanent magnet synchronous motor, comprising the above-mentioned motor rotor assembly and a motor stator arranged therewith, wherein the motor stator comprises a stator core 3, and the annular space formed between the stator core 3 and the rotor core 1 is also the aforementioned stator-rotor air gap.

[0059] According to an embodiment of the present invention, a compressor is further provided, comprising the above-mentioned motor rotor assembly.

[0060] It is easy for those skilled in the art to understand that, under the premise of no conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A motor rotor assembly, comprising a rotor core (1), the rotor core (1) having a plurality of magnetic poles, each of the magnetic poles being evenly spaced along the circumferential direction of the rotor core (1), a first V-shaped magnetic steel slot (11) being formed under each of the magnetic poles, two first permanent magnets (21) arranged in a V-shape being provided in each of the first V-shaped magnetic steel slots (11), and under any magnetic pole, the first V-shaped magnetic steel slot (11) and the two first permanent magnets (21) being symmetrical about the d-axis of the magnetic pole, characterized in that: Two second V-shaped magnetic steel slots (12) symmetrical about the d-axis are further formed under each of the magnetic poles. The two second V-shaped magnetic steel slots (12) are located within the opening range of the first V-shaped magnetic steel slot (11) and are respectively located at the radial outer end positions of the two first permanent magnets (21). A second permanent magnet (22) and a third permanent magnet (23) arranged in a V shape are provided in each of the second V-shaped magnetic steel slots (12), wherein the third permanent magnet (23) is located on the side of the second permanent magnet (22) close to the d-axis.

2. The motor rotor assembly according to claim 1, characterized in that: The second permanent magnet (22) is parallel to the first permanent magnet (21) corresponding to its position.

3. The motor rotor assembly according to claim 2, characterized in that: A straight-line magnetic steel slot (13) is also formed under each magnetic pole. A fourth permanent magnet (24) is provided in the straight-line magnetic steel slot (13) and is located within the opening range of the first V-shaped magnetic steel slot (11). The straight-line magnetic steel slot (13) and the fourth permanent magnet (24) are symmetrical about the d-axis, and the straight-line magnetic steel slot (13) is located on the side of the third permanent magnet (23) close to the center of the rotor core (1).

4. The motor rotor assembly according to claim 3, characterized in that: Both ends of the fourth permanent magnet (24) and the two third permanent magnets (23) form an interlaced overlap in the direction of the d-axis.

5. The motor rotor assembly according to claim 3, characterized in that: The fourth permanent magnet (24) is parallel to the third permanent magnet (23).

6. The motor rotor assembly according to claim 3, characterized in that: A third V-shaped magnetic steel slot (14) is further formed under each of the magnetic poles. Each of the third V-shaped magnetic steel slots (14) is located within the opening range of the first V-shaped magnetic steel slot (11) and is symmetrical about the d-axis. The third V-shaped magnetic steel slot (14) is located on a side of the outer circle of the two third permanent magnets (23) close to the rotor core (1). Two fifth permanent magnets (25) arranged in a V shape are provided in the third V-shaped magnetic steel slot (14).

7. The motor rotor assembly according to claim 6, characterized in that: The radial thickness of the first permanent magnet (21) is d1, the radial thickness of the second permanent magnet (22) is d2, the radial thickness of the third permanent magnet (23) is d3, the radial thickness of the fourth permanent magnet (24) is d4, and the radial thickness of the fifth permanent magnet (25) is d5, d2=d5, d3=d4, d1>d2>d3.

8. The motor rotor assembly according to claim 7, characterized in that: d1=1.77mm~1.83mm, 1.27mm≤d2=d5≤1.33mm, 1.07mm≤d3=d5≤1.13mm.

9. The motor rotor assembly according to claim 7 or 8, characterized in that: The V-shaped angle of the first V-shaped magnetic steel groove (11) is φ3, the V-shaped angle of the second V-shaped magnetic steel groove (12) is φ1, and the V-shaped angle of the third V-shaped magnetic steel groove (14) is φ2, φ1>φ3, φ2>φ3.

10. The motor rotor assembly according to claim 9, characterized in that: φ1=φ2=144.5°~145.5°, φ3=109.5°~110.5°.

11. The motor rotor assembly according to claim 9, characterized in that: The minimum distance between the first V-shaped magnetic steel slot (11) and the center of the rotor core (1) is H, the minimum spacing between the two second V-shaped magnetic steel slots (12) is H2, the minimum spacing between the second V-shaped magnetic steel slot (12) and the straight magnetic steel slot (13) is H1, and the maximum spacing between the radial outer slot wall of the third V-shaped magnetic steel slot (14) and the outer circle of the rotor core (1) is H3, H=15.45mm~15.55mm, H1=0.98mm~1.04mm, H2=2.48mm~2.54mm, H3=2.78mm~2.84mm.

12. The motor rotor assembly according to claim 12, characterized in that: An interpolar groove (15) is provided on the outer circle of the rotor core (1) between two adjacent magnetic poles. The interpolar groove (15) penetrates the axial ends of the rotor core (1) along the axial direction of the rotor core (1). The interpolar groove (15) is an expansion shape that gradually expands outward along the radial direction of the rotor core (1), and the interpolar groove (15) is symmetrical about the q axis corresponding to its position. The groove depth of the interpolar groove (15) is 0.57mm-0.63mm, the groove width of the interpolar groove (15) is q1, and the groove bottom width of the interpolar groove (15) is q2, 5.8mm≤q2≤6.2mm, 8mm≤q1≤8.4mm.

13. A motor, characterized in that: A motor rotor assembly comprising the motor rotor assembly according to any one of claims 1 to 12.

14. A compressor, characterized in that: A motor rotor assembly comprising the motor rotor assembly according to any one of claims 1 to 12.

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