A motor, compressor and air conditioner

Abstract

The application provides a motor, a compressor and an air conditioner, and belongs to an energy-saving motor. The motor comprises a stator assembly and a rotor assembly; the outer diameter of the stator core is D1, the inner diameter of the stator core is D2, the number of the stator slots is Q, and the slot area of a single stator slot is S; the distance between the inner side wall and the outer side wall of the magnetic steel is the width, the maximum dimension perpendicular to the width is the thickness, the thickness of a single magnetic steel is H, the width of a single magnetic steel is W, the number of the magnetic steels is A, and the pole number of the rotor assembly is P; the outer diameter D1, the inner diameter D2, the number Q, the slot area S, the thickness H, the width W, the number A and the pole number P satisfy: 55<=P / A<=90. The formula of the application is used to represent the balance relationship among the stator slot ratio, the copper wire consumption, the magnetic steel consumption and the magnetic steel shape of the motor, and the essence of the formula is to realize a larger slot ratio, less copper wire consumption and moderate and larger-width smaller-thickness magnetic steel consumption under a unit volume.

Description

Technical Field

[0001] This invention belongs to the field of air conditioner technology, specifically relating to an electric motor, a compressor, and an air conditioner, and is an energy-saving electric motor. Background Technology

[0002] With the upgrading of air conditioner energy efficiency standards and the development of cost competition, the performance requirements for the motors inside air conditioner compressors are becoming increasingly stringent, especially in achieving the best balance between high power density, high efficiency, and low cost. Currently, traditional permanent magnet synchronous motor designs often focus on optimization in a single dimension, such as simply pursuing high torque density while ignoring material costs, or relying excessively on reducing the amount of copper wire used when copper prices are high, leading to severe motor overheating and decreased efficiency.

[0003] Existing motor design methods lack systematic quantitative models for the coupling relationships of key geometric parameters such as rotor magnet width and quantity, stator slot number, pole number, and air gap size. Especially when using multi-slot, pole-multi-slot concentrated windings, there is a lack of effective solutions for how to rationally allocate the ratio of copper wire to magnet usage to cope with raw material price fluctuations, while simultaneously ensuring the motor's anti-interference capability and stability under harsh operating conditions, should copper prices rise. Summary of the Invention

[0004] This invention provides an electric motor, a compressor, and an air conditioner. It is an energy-saving electric motor that can solve the technical problem of the lack of geometric parameter coupling relationship in the existing motor structure, so as to reasonably allocate the ratio of copper wire and magnet.

[0005] This invention provides an electric motor including a stator assembly and a rotor assembly;

[0006] The stator assembly includes a stator core having multiple stator teeth circumferentially distributed around the axis of the stator core, with stator slots formed between adjacent stator teeth. In a cross-section perpendicular to the motor axis, the outer diameter of the stator core is D1, the inner diameter of the stator core is D2, the number of stator slots is Q, and the slot area of ​​a single stator slot is S.

[0007] The rotor assembly is coaxially arranged with the stator assembly. The rotor assembly includes a rotor core and a plurality of magnets disposed on the rotor core. In a cross-section perpendicular to the motor axis, the magnets have an inner sidewall near the center of the rotor core and an outer sidewall near the outer edge of the rotor core. The distance between the inner sidewall and the outer sidewall is the width, the maximum dimension perpendicular to the width is the thickness, the thickness of a single magnet is H, the width of a single magnet is W, the number of magnets is A, and the number of poles of the rotor assembly is P.

[0008] The outer diameter D1, the inner diameter D2, the quantity Q, the groove area S, the thickness H, the width W, the quantity A, and the number of poles P satisfy the following:

[0009] 55≤ ≤90.

[0010] Wherein, GCD(Q, P) is the greatest common divisor of the quantity Q and the number of poles P, the units of the outer diameter D1, the inner diameter D2, the thickness H, and the width W are mm, and the unit of the groove area S is mm. 2 .

[0011] In some embodiments, the magnet has a rectangular cross-section, with the thickness direction being the short side direction and the width direction being the long side direction, and the dimension in the width direction being larger than the dimension in the thickness direction.

[0012] In some embodiments, the air gap between the stator assembly and the rotor assembly is B, wherein the air gap B satisfies: 0.45≤B≤0.6mm.

[0013] In some embodiments, the magnet is arranged in a V-shape, and each magnetic pole of the rotor assembly is provided with one magnet. In a cross section perpendicular to the motor axis, the magnet includes a first magnet arm and a second magnet arm. One end of the first magnet arm and the second magnet arm are close to each other and face the center of the rotor core, while the other end of the first magnet arm and the second magnet arm face the outer edge of the rotor core.

[0014] In some embodiments, the angle between the first magnet arm and the second magnet arm toward the outer edge of the rotor core is the magnet angle θ, and the magnet thickness H and the magnet angle θ satisfy: 1mm≤H≤1.3mm, 80°≤θ≤120°.

[0015] In some embodiments, the motor is an 18-slot 12-pole motor structure or a 15-slot 10-pole motor structure.

[0016] In some embodiments, when the magnet is a V-shaped magnet, the pointed end of the magnet is close to the center of the rotor core, the open end of the magnet is close to the outer edge of the rotor core, the straight-line distance between the pointed end of the magnet and the center of the rotor core is H1, the straight-line distance between the two endpoints of the open end of the magnet is H2, the radius of the rotor core is R1, and the number of magnet plates per pole of the rotor core is B. The straight-line distance H1, the straight-line distance H2, the radius R1, and the number of plates B satisfy: 0.7≤H1*H / R1≤0.95, and 1.3≤W*B / H2≤1.5.

[0017] In some embodiments, each magnetic pole of the rotor assembly is provided with a first comb hole and a second comb hole, and each side of the center line of the magnetic pole is provided with a first comb hole and a second comb hole. The first comb hole and the second comb hole are located radially outside the magnet. On each side of the center line of the magnetic pole, the first comb hole is closer to the center line of the magnetic pole than the second comb hole. In a cross section perpendicular to the motor axis, the edges of the first comb hole and the second comb hole on the same side are concave arc segments, and the concave directions of the two concave arc segments are opposite to each other. The cross-sectional area of ​​the first comb hole is larger than the cross-sectional area of ​​the second comb hole.

[0018] In some embodiments, within a cross-section perpendicular to the motor axis, the first comb hole includes a first arc segment, a second arc segment, and a third arc segment. The first arc segment is located at one end of the first comb hole near the outer edge of the rotor core, and the second arc segment is located at one end of the first comb hole near the magnet. The first arc segment and the second arc segment are connected by the third arc segment, which is the concave arc segment.

[0019] The radius of the first arc segment is R3, and the radius of the second arc segment is R4. The radius of the first arc segment is greater than the radius of the second arc segment. The line connecting the center of the first arc segment and the center of the second arc segment forms an angle G with the center line of the magnetic pole. The angle G, the radius R3, and the radius R4 satisfy: 25°≤G≤30°, 1.3≤R3 / R4≤1.8.

[0020] In some embodiments, the outer edge of the rotor core is provided with a tangent edge in a cross section perpendicular to the motor axis, and the tangent edge is a straight edge; the second comb hole includes two fourth arc segments and one fifth arc segment, the two fourth arc segments are respectively located at both ends of the second comb hole, and the two fourth arc segments are connected by the fifth arc segment, the fifth arc segment is the concave arc segment, and the line connecting the centers of the two fourth arc segments is parallel to the tangent edge.

[0021] In some embodiments, the motor is an 18-slot, 12-pole motor structure.

[0022] A compressor includes a motor, said motor being the motor described above.

[0023] An air conditioner includes a compressor, said compressor being the compressor described above.

[0024] The present invention provides an electric motor, a compressor, and an air conditioner, which belong to the category of energy-saving electric motors and have the following beneficial effects:

[0025] The formula of this invention is a comprehensive motor parameter matching index composed of multiple design constraints. It is used to characterize the balance between stator split ratio, copper wire usage, magnet usage, and magnet shape. The essence of the formula is to achieve a larger split ratio, less copper wire usage, and a moderate amount of magnets with a larger width and smaller thickness per unit volume, thereby obtaining a motor solution that balances high torque density, high efficiency, and low cost. Specifically, the ratio of total magnet width to magnet thickness is expressed as W*A in the numerator, representing the total width of the magnet along the rotor circumference, and H in the denominator, representing the thickness of a single magnet in the magnetization direction. Placing W*A in the numerator and H in the denominator reflects the design concept of using magnets with a larger width and smaller thickness for the same magnet volume. The effective excitation area of ​​a magnet is mainly composed of its length and width. Increasing the width of the magnet can provide a larger permanent magnet flux with the same magnet volume, thus improving the utilization efficiency of the permanent magnet. Reducing the thickness of the magnet can reduce the amount of rare earth permanent magnet material used. At the same time, the V-shaped magnetic circuit design increases the direct-axis reluctance and reduces the direct-axis inductance, which is conducive to increasing the reluctance torque ratio and improving torque output and motor cost-effectiveness without increasing the amount of permanent magnet used.

[0026] The formula of this invention is a comprehensive motor parameter matching index composed of multiple design constraints. It is used to characterize the balance between the stator split ratio, copper wire usage, magnet usage, and magnet shape of the motor. The essence of the formula is to achieve a larger split ratio, less copper wire usage, and a moderate amount of magnets with a larger width and smaller thickness per unit volume, thereby obtaining a motor solution that balances high torque density, high efficiency, and low cost. Attached Figure Description

[0027] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a 15-slot, 10-pole motor according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of an 18-slot, 12-electrode circuit according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the outer diameter D1, inner diameter D2, quantity Q, groove area S, thickness H, width W, quantity A, and number of poles P of an embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of a magnet subjected to a demagnetizing magnetic field and its effective portion, according to an embodiment of the present invention.

[0032] Figure 5 This is a schematic diagram of the included angle θ of the magnets in an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the straight-line distance H1, straight-line distance H2, radius R1, and number of pieces B in an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the first and second magnetic comb holes according to an embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of the included angle G, radius R3, and radius R4 in an embodiment of the present invention;

[0036] Figure 9 This is a schematic diagram comparing the motor efficiency of an embodiment of the present invention;

[0037] Figure 10 This is a schematic diagram comparing copper losses in an embodiment of the present invention;

[0038] Figure 11 This is a schematic diagram of torque pulsation according to an embodiment of the present invention;

[0039] Figure 12 A schematic diagram comparing radial electromagnetic force densities.

[0040] Attached Figure: 1-Stator core; 101-Stator tooth; 102-Stator slot; 2-Rotor core; 21-Inner wall; 22-Outer wall; 3-Magnet; 31-First magnet arm; 32-Second magnet arm; 41-First comb hole; 411-First arc segment; 412-Second arc segment; 413-Third arc segment; 42-Second comb hole; 421-Fourth arc segment; 422-Fifth arc segment; 5-Magnetic pole; 6-Cut edge; 7-Winding. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In the description of this invention, 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 invention 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 invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0043] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used here to describe the spatial positional relationship of a device or feature as shown in the figure with other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation of the device as described in the figure. For example, if a device in the figure is inverted, a device described as "above" or "on top of" other devices or structures will subsequently be positioned as "below" or "under" other devices or structures.

[0044] See also Figures 1 to 8 As shown, according to an embodiment of the present invention, an electric motor is provided, which belongs to an energy-saving electric motor, including a stator assembly and a rotor assembly; the stator assembly includes a stator core 1 and a winding 7, the stator core 1 has a plurality of stator teeth 101, the plurality of stator teeth 101 are circumferentially distributed around the axis of the stator core 1, the stator winding 7 is wound on the stator teeth 101, and a stator slot 102 is formed between two adjacent stator teeth 101. In a cross section perpendicular to the motor axis, the outer diameter of the stator core 1 is D1, the inner diameter of the stator core 1 is D2, the number of stator slots 102 is Q, and the slot area of ​​a single stator slot 102 is S.

[0045] The rotor assembly is coaxially arranged with the stator assembly, and the rotor assembly is rotatably disposed on the radially inner side of the stator assembly. The rotor assembly includes a rotor core 2 and a plurality of magnets 3 disposed on the rotor core 2. In a cross-section perpendicular to the motor axis, each magnet 3 has an inner wall 21 near the center of the rotor core 2 and an outer wall 22 near the outer edge of the rotor core 2. The distance between the inner wall 21 and the outer wall 22 is the width, the maximum dimension perpendicular to the width is the thickness, the thickness of a single magnet 3 is H, the width of a single magnet 3 is W, the number of magnets 3 is A, and the number of poles of the rotor assembly is P. The outer diameter D1, inner diameter D2, number Q, slot area S, thickness H, width W, number A, and number of poles P satisfy the following:

[0046] 55≤ ≤90.

[0047] Where GCD(Q, P) is the greatest common divisor of the quantity Q and the number of poles P, the units of outer diameter D1, inner diameter D2, thickness H and width W are mm, and the unit of groove area S is mm. 2 It is worth noting that when applying the above formula, the outer diameter D1, the inner diameter D2, the magnet thickness H, and the magnet width W are all substituted with their values ​​in mm, the groove area S is substituted with its value in mm², and the quantity Q, the number of magnets A, the number of poles P, and the greatest common divisor GCD(Q,P) are directly substituted with their values. In other words, the calculation process of the above formula only involves numerical calculations of each parameter, without involving unit conversions or dimensional derivations of physical quantities. The constant 10000 in the formula is a dimensionless numerical adjustment coefficient, its function being to ensure that the calculation results fall within a numerical range that facilitates engineering comparisons.

[0048] It is worth noting that the slot area refers to the area of ​​the internal region of the slot, excluding the slot opening area between adjacent stator teeth 101. GCD(Q, P) represents the greatest common divisor of the number of stator slots 102 Q and the number of rotor poles P. Specifically, for positive integers Q and P, the greatest common divisor is the largest positive integer that can divide both Q and P simultaneously, i.e., the maximum value among all common factors of Q and P. The number of stator slots 102 Q and the number of rotor poles P are key parameters determining the pole-slot fit. The greatest common divisor of the two physically characterizes the number of common cycles in the circumferential direction of the tooth and slot distribution of the stator core 1 and the magnetic pole 5 distribution of the rotor magnet 3. The larger this value is, the more symmetrical repeating units of the motor magnetic field along the circumferential direction, and the electromagnetic characteristics related to the pole-slot fit, such as magnetic field harmonics, torque ripple, cogging torque, and radial force waves, will also change accordingly. Therefore, incorporating GCD(Q, P) as design parameters into the formula of this invention can more accurately reflect the influence of pole-slot matching on motor performance, giving the parameter relationship a clear physical meaning. This helps to optimize the matching relationship between the number of stator slots 102, the number of rotor poles, and the size of magnets 3 during motor design, thereby obtaining better electromagnetic performance and operational stability.

[0049] Specifically, the formula in this embodiment is a comprehensive motor parameter matching index composed of multiple design constraints. It is used to characterize the balance between the stator split ratio, copper wire usage, magnet 3 usage, and magnet 3 shape. The essence of the formula is to achieve a larger split ratio, less copper wire usage, and a moderate amount of magnet 3 with a larger width and smaller thickness per unit volume, thereby obtaining a motor solution that balances high torque density, high efficiency, and low cost. Specifically, the ratio of the total width of magnet 3 to the thickness of magnet 3 is W*A in the numerator, which represents the total width of magnet 3 along the rotor circumference, and H in the denominator, which represents the thickness of a single magnet 3 in the magnetization direction. Placing W*A in the numerator and H in the denominator reflects the design concept of using magnet 3 with a larger width and smaller thickness for the same magnet 3 volume. The effective excitation area of ​​magnet 3 is mainly composed of its length and width. Increasing the width of magnet 3 can provide a larger permanent magnet flux within the same volume, improving the utilization efficiency of the permanent magnet. Reducing the thickness of magnet 3 can reduce the amount of rare earth permanent magnet material used, increase direct-axis reluctance, and reduce direct-axis inductance, which is beneficial to increasing the reluctance torque ratio and improving torque output and motor cost-effectiveness without increasing the amount of permanent magnet. Regarding the split ratio, with the same motor outer diameter D1, increasing the stator inner diameter D2 means an increased split ratio, a corresponding increase in the rotor outer diameter, and an increase in the motor's lever arm. According to the basic relationship of torque = force * lever arm, a larger rotor radius is beneficial for outputting greater torque. At the same time, a larger split ratio provides more installation space for the rotor, which is beneficial for arranging magnet 3. However, an increased split ratio will also compress the space of stator slot 102, reducing the slot area S and the amount of copper wire used. Therefore, S*Q is introduced as the denominator in the formula to constrain the amount of copper wire used to avoid being too small.

[0050] Specifically, S*Q in the denominator represents the total stator slot area, reflecting the available slot space of the stator winding 7, i.e., the amount of copper wire used. Placing S*Q in the denominator indicates that this embodiment tends to use a smaller total stator slot area, i.e., less copper wire used, to reduce the cost of enameled wire. However, reducing the amount of copper wire may lead to increased copper loss and decreased efficiency. Therefore, it is necessary to compensate for this through reasonable magnet 3 dimensions, magnet 3 arrangement, and pole-slot matching, so that the motor can maintain high efficiency and torque performance while reducing the amount of copper wire used. GCD(Q, P) is the greatest common divisor of the number of stator slots 102 Q and the number of rotor poles P, used to limit the motor slot-pole combinations for which this formula is mainly applicable. The greatest common divisor characterizes the number of common cycles of the stator tooth 101 slot distribution and the rotor magnetic pole 5 distribution in the circumferential direction, reflecting the symmetry and harmonic characteristics of the motor's magnetic field. Introducing this parameter into the formula allows the formula to be directly related to the motor's pole-slot matching, avoiding the distortion of the formula evaluation caused by different periodic characteristics of different slot-pole combinations, thereby ensuring that the formula has guidance under the target slot-pole matching. The constant 10000 in the formula is mainly used to balance the physical units and orders of magnitude of each parameter, so that the calculation results of the formula fall within a numerical range that is easy to compare in engineering, and can be used as a unified design index for scheme selection and optimization.

[0051] In this embodiment, in conjunction with the reference Figure 9 and Figure 10 As shown, when the parameter relationships satisfy the above formula, the motor exhibits a distribution characterized by a large crack ratio per unit volume, low copper wire usage, moderate magnet 3 usage, and a relatively large width and thin thickness of magnet 3. However, the calculated value of the formula corresponding to conventional motor designs is usually less than 55, indicating a smaller crack ratio, higher copper wire usage, or a thicker and narrower magnet 3 shape. This makes it difficult to simultaneously achieve the high cost-effectiveness design of this invention, which combines a large crack ratio, wide and thin magnet 3, and low copper usage. Therefore, this formula can be used as an initial design and performance evaluation tool for the motor, guiding the matching and optimization of parameters such as stator inner diameter, stator outer diameter, stator slot 102 area, number of slots, number of poles, magnet 3 thickness, magnet 3 width, and magnet 3 quantity. This can achieve a good balance between motor outer diameter, manufacturing cost, and output performance, effectively improving the motor's torque density, operating efficiency, and cost-effectiveness.

[0052] As a specific implementation method, the motor structure to which the above formula is most suitable is an 18-slot 12-pole motor structure or a 15-slot 10-pole motor structure.

[0053] See also Figures 1 to 8 As shown, the cross-section of magnet 3 is rectangular, with the thickness direction being the short side direction and the width direction being the long side direction. The dimension in the width direction is larger than the dimension in the thickness direction.

[0054] In this embodiment, the width direction is the long side of the rectangular cross-section, and the dimension in the width direction is greater than the dimension in the thickness direction. This results in a single magnet 3 having a larger width dimension and a smaller thickness dimension within the cross-section perpendicular to the motor axis. Given a fixed total volume or quantity of magnets 3, increasing the width of magnets 3 increases their effective excitation area, which is beneficial for improving the utilization efficiency of permanent magnets. This allows the motor to obtain greater permanent magnet flux and air gap magnetic density, thereby increasing permanent magnet torque and torque density. Conversely, reducing the thickness of magnets 3 helps reduce the amount of rare-earth permanent magnet material used, lowering material costs. Furthermore, the rectangular cross-sectional shape of magnet 3 matches the aforementioned parameter relationships, allowing for more accurate optimization of parameters such as the width W, thickness H, and quantity A of magnet 3 through these relationships. When the parameter relationships satisfy the formula range, it ensures that magnet 3 has sufficient width to provide ample permanent magnet flux, while also preventing insufficient thickness that could lead to decreased flux density or increased risk of demagnetization. This achieves a comprehensive technical effect of reducing copper wire usage, increasing the crack ratio, and reducing magnet 3 costs while ensuring stable and reliable electromagnetic performance of the motor, effectively improving the motor's cost-effectiveness.

[0055] See also Figures 1 to 8 As shown, the air gap between the stator assembly and the rotor assembly is B, that is, an air gap is formed between the inner circumferential surface of the stator core 1 and the outer circumferential surface of the rotor core 2. In a section perpendicular to the motor axis, the radial dimension of the air gap is B, and the air gap B satisfies: 0.45mm≤B≤0.6mm.

[0056] Specifically, the air gap between the stator and rotor is composed of non-ferromagnetic media such as air, and its permeability is much lower than that of the ferromagnetic materials such as silicon steel sheets used in the stator core 1 and rotor core 2. In the motor magnetic circuit, the total magnetic reluctance is composed of the reluctances of the stator core 1 section, the air gap section, and the rotor core 2 section connected in series, with the air gap reluctance being dominant, typically accounting for 70% to 90% of the total reluctance. When the radial dimension of the air gap decreases, the air gap reluctance decreases accordingly. Under the same excitation magnetomotive force, the air gap flux increases, and the air gap magnetic density increases accordingly, thereby improving the torque density of the motor. At the same time, under the same output torque, a smaller air gap reluctance can reduce the excitation current required to maintain the rated magnetic flux, thereby reducing the total stator current and reducing the copper loss of the motor winding 7. Since copper loss is an important component of motor losses, reducing copper loss can effectively improve the operating efficiency of the motor.

[0057] In this embodiment, by limiting the radial dimension B of the air gap to between 0.45 mm and 0.6 mm, the air gap magnetic reluctance of the magnetic circuit between the stator core 1 and the rotor core 2 can be effectively reduced, increasing the air gap magnetic flux density and the torque density of the motor, thereby improving the power density and operating efficiency of the motor. Furthermore, controlling the lower limit of the air gap to above 0.45 mm avoids reliability issues such as difficulties in stator-rotor assembly and collisions during operation caused by an excessively small air gap, ensuring the motor's assembly processability and operational stability. Simultaneously, controlling the upper limit of the air gap to below 0.6 mm avoids problems such as a significant increase in air gap magnetic reluctance, a decrease in air gap magnetic flux density, a reduction in torque density, and a deterioration in the utilization rate of permanent magnets due to an excessively large air gap, thereby preventing an increase in motor size and cost. Therefore, limiting the air gap B within the above range achieves a good balance between the motor's electromagnetic performance and manufacturing and assembly reliability, further improving the overall performance of the motor.

[0058] See also Figures 1 to 8 As shown, the magnet 3 is arranged in a V-shape, and each magnetic pole 5 of the rotor assembly is provided with one magnet 3. In a cross-section perpendicular to the motor axis, the magnet 3 includes a first magnet arm 31 and a second magnet arm 32. One end of the first magnet arm 31 and the second magnet arm 32 are close to each other and face the center of the rotor core 2, while the other end of the first magnet arm 31 and the second magnet arm 32 face the outer edge of the rotor core 2. Specifically, the first magnet arm 31 and the second magnet arm 32 are close to each other at the end near the center of the rotor core 2, and gradually open from this connection point towards the outer edge of the rotor core 2, so that the magnet 3 is V-shaped as a whole, and the opening of the V-shape faces the outer edge of the rotor core 2.

[0059] Specifically, both the first magnetic arm 31 and the second magnetic arm 32 are rectangular plates. The width direction of the first magnetic arm 31 and the width direction of the second magnetic arm 32 are perpendicular to the thickness direction at their respective positions. The first magnetic arm 31 and the second magnetic arm 32 are symmetrically arranged with respect to the center line of the magnetic pole 5.

[0060] In this embodiment, by constructing the magnet 3 in a V-shape, the two arms of the magnet 3 under each magnetic pole 5 form a magnetic concentrating structure, which can concentrate the magnetic lines of force generated by the magnet 3 towards the air gap side, increasing the air gap magnetic flux density and thus improving the torque density of the motor. At the same time, the V-shaped structure increases the equivalent width of the magnet 3 in the rotor radial direction, which is beneficial to increasing the saliency ratio of the motor, increasing the reluctance torque ratio, and further improving the torque output capability and operating efficiency of the motor. In addition, the arrangement of the V-shaped magnets 3 makes the width direction of the magnet 3 match the magnetic circuit direction, which can increase the effective excitation area of ​​the magnet 3 while reducing the thickness of the magnet 3. Combined with the aforementioned parameter relationship, the electromagnetic performance of the motor can be maintained or even improved while reducing the amount of magnet 3 used, thereby further improving the cost performance of the motor.

[0061] See also Figures 1 to 8 As shown, the angle between the first magnet arm 31 and the second magnet arm 32 toward the outer edge of the rotor core 2 is the magnet 3 angle θ, and the thickness H of the magnet 3 and the magnet 3 angle θ satisfy: 1mm≤H≤1.3mm, 80°≤θ≤120°.

[0062] Specifically, since the volume of magnet 3 can be expressed as length × width × thickness, and the magnetization direction of magnet 3 is the thickness direction, under the condition that the length and total volume of magnet 3 are basically constant, the smaller the thickness H of magnet 3, the larger the width W of magnet 3. Increasing the width of magnet 3 can expand the coverage area of ​​magnetic pole 5. The coverage area of ​​magnetic pole 5 is the height × width of magnet 3, which is independent of thickness. This allows the magnetic flux to be more evenly distributed in stator teeth 101 and stator slots 102, which is beneficial to improving magnetic flux utilization and enhancing the torque output capability of the motor. At the same time, reducing the thickness of magnet 3 can significantly reduce the eddy current loss inside magnet 3, thereby reducing the additional loss of the motor and improving the operating efficiency of the motor.

[0063] Specifically, setting the lower limit of the thickness H of the magnet 3 to 1mm avoids the problems of insufficient mechanical strength and weakened anti-demagnetization ability caused by the magnet 3 being too thin, ensuring the structural reliability and magnetic performance stability of the magnet 3 during motor operation. Setting the upper limit of the thickness H of the magnet 3 to 1.3mm avoids the problems of reduced width of the magnet 3, insufficient coverage area of ​​the magnetic pole 5, and increased eddy current loss caused by the magnet 3 being too thick. Thus, within the range of 1mm to 1.3mm, the thickness H of the magnet 3 can balance magnetic flux utilization, eddy current loss, mechanical strength, and anti-demagnetization ability, enabling the motor to maintain good reliability while operating efficiently. The included angle θ of the magnet 3 is limited to between 80° and 120°, giving the V-shaped magnet 3 a moderate depth. When θ is smaller, for example, close to 80°, the depth of the V-shaped magnet 3 is greater, and the two arms of the magnet 3 extend further into the rotor. Under the same demagnetizing magnetic field strength, the effective demagnetizing magnetic field strength acting on the magnet 3 is smaller, thus making the magnet 3 less prone to demagnetization. This helps improve the motor's anti-demagnetization capability and enhances the motor's operational reliability under harsh conditions such as overload and high temperature. When θ is larger, for example, close to 120°, the depth of the V-shaped magnet 3 is shallower, and the magnetizing effect of the V-shaped structure is relatively weakened. However, this avoids problems such as increased magnetic leakage at the ends of the magnet 3, decreased magnet 3 utilization, and poor assembly processability caused by an excessively small included angle. Controlling θ within the range of 80° to 120° achieves a good balance between magnetizing effect, anti-demagnetization capability, magnet 3 utilization, and process feasibility.

[0064] In this embodiment, the thickness H of the magnet 3 and the included angle θ of the magnet 3 are not independent but rather work together to influence the electromagnetic performance, demagnetization resistance, and operational reliability of the motor. The thickness H of the magnet 3 is limited to a small range, resulting in a wide and thin shape for a single magnet 3 in a cross-section perpendicular to the motor axis. With the volume of the magnet 3 remaining essentially constant, a decrease in thickness H means an increase in width W, which correspondingly increases the coverage area of ​​the magnetic poles 5. This facilitates a more uniform distribution of magnetic flux in the stator slots 102, improving flux utilization. Simultaneously, the reduced thickness of the magnet 3 significantly reduces eddy current losses within the magnet 3, thereby improving motor efficiency. However, excessively thin magnets 3 may lead to a decrease in mechanical strength and a weakening of demagnetization resistance. Therefore, the included angle θ of magnets 3 is limited to 80°≤θ≤120°, ensuring the V-shaped magnet 3 has an appropriate depth. The thickness H of magnet 3 and the included angle θ complement each other, preserving the advantages of thin magnets 3 in terms of eddy current loss and flux utilization, while the reasonable setting of the V-angle compensates for the insufficient demagnetization resistance of thin magnets 3. These two aspects complement each other, enabling the motor to operate efficiently while maintaining excellent demagnetization reliability. Reducing the thickness H of magnet 3 leads to a decrease in its cross-sectional area and a slight reduction in unipolar flux capability; however, the V-shaped magnet 3 structure itself has a magnetic focusing effect, with the magnetic flux generated by the first magnet arm 31 and the second magnet arm 32 converging towards the air gap side, increasing the air gap magnetic density. By controlling the included angle θ of magnet 3 within the range of 80° to 120°, sufficient magnetic concentration depth and effect of the V-shaped structure can be ensured. This allows for maintaining high air gap flux and torque density even with a thinner magnet 3 and reduced permanent magnet usage. Therefore, the synergistic effect of magnet 3 thickness H and magnet 3 included angle θ effectively reconciles the contradiction between using fewer magnets 3 and high-performance output, achieving a simultaneous increase in magnet 3 utilization and motor torque density. Within the aforementioned range, magnet 3 thickness H and magnet 3 included angle θ mutually constrain and promote each other, producing synergistic technical effects that cannot be achieved by a single thickness or angle limitation: on the one hand, reducing thickness lowers losses and improves material utilization; on the other hand, V-shaped magnetic concentration and anti-demagnetization compensation maintain and enhance the electromagnetic performance and reliability of the motor, ultimately achieving a comprehensive balance between low cost, high efficiency, high torque density, and strong anti-demagnetization capability.

[0065] See also Figures 1 to 8 As shown, the motor has an 18-slot 12-pole structure or a 15-slot 10-pole structure.

[0066] Specifically, 55≤ The matching method between the number of stator slots (Q) and rotor poles (P) can be appropriately adjusted according to actual design requirements. Parameters such as the split ratio, total width of magnets (3), and V-angle can all be optimized and matched within the range of the above formulas. Preferably, the motor is an 18-slot 12-pole motor structure or a 15-slot 10-pole motor structure. That is, the number of stator slots (Q) is 18 and the number of rotor poles (P) is 12, or the number of stator slots (Q) is 15 and the number of rotor poles (P) is 10. In conventional motors, the thickness of magnets (3) in common 9-slot 6-pole and 12-slot 8-pole structures is generally between 1.5mm and 1.8mm. After substituting the corresponding dimensions into the above parameter relationships, the calculated value is usually less than 20. The thickness of magnets (3) in mass-produced 15-slot 10-pole motor structures is usually 1.3mm to 1.5mm. After substituting into the above parameter relationships, the calculated value is also generally less than 40. The parameter relationship values ​​of the above-mentioned existing structures are all lower than the lower limit of 55 defined by this formula, indicating that conventional motor design cannot meet the comprehensive design characteristics required by this invention, such as large crack ratio, less copper wire usage, wider magnet 3 width and smaller thickness. Therefore, it is difficult to achieve the technical effects of high torque density, high efficiency and low cost.

[0067] In this embodiment, in conjunction with the reference Figure 1 and Figure 2 As can be seen, the 18-slot, 12-pole magnet 3 is deeper, meaning it is closer to the center of the rotor core 2. The parameter relationships in this embodiment focus on optimizing the 18-slot, 12-pole structure while also considering the 15-slot, 10-pole structure. Under the 18-slot, 12-pole structure, the constraints of the aforementioned formula allow the motor to achieve a larger split ratio and a smaller total stator slot area per unit volume. Combined with the design of the wider and thinner magnet 3, it can significantly reduce the amount of copper wire and magnet 3 used while ensuring sufficient air gap flux and torque output capability, thereby achieving excellent electromagnetic performance and cost advantages. The 15-slot, 10-pole structure, as an alternative, can also achieve similar design effects within the formula range, providing a flexible choice for the serialization of motors. This embodiment configures the motor with either an 18-slot, 12-pole or 15-slot, 10-pole structure, and, combined with the constraints of the aforementioned parameter relationships, enables a synergistically optimized matching state between various design parameters, ensuring a good balance between low cost, high efficiency, and high torque density.

[0068] See also Figures 1 to 8As shown, when magnet 3 is a V-shaped magnet 3, the pointed end of magnet 3 is close to the center of rotor core 2, and the open end of magnet 3 is close to the outer edge of rotor core 2. The straight-line distance between the pointed end of magnet 3 and the center of rotor core 2 is H1, the straight-line distance between the two ends of the open end of magnet 3 is H2, the radius of rotor core 2 is R1, and the number of magnet 3 plates per pole 5 of rotor core 2 is B. The straight-line distances H1 and H2, the radius R1, and the number of plates B satisfy: 0.7≤H1*H / R1≤0.95, and 1.3≤W*B / H2≤1.5. The thickness of magnet 3, the distance of magnet 3 from the rotor center, and the distance between the endpoints of the outer surface of magnet 3 all affect the magnitude of air gap magnetic flux density and harmonic distribution, which in turn affect the motor output and copper loss, thus affecting motor efficiency. The above formula only represents the numerical constraint relationship between the design parameters. The units in the formula are only for clarifying the measurement standards and the basis for the values ​​of each parameter, and are not for performing dimensional analysis of the formula. When applying the formula, those skilled in the art only need to substitute the values ​​obtained by measuring according to the above units into the corresponding variables in the formula.

[0069] Specifically, by limiting the matching relationship between the radial position of the sharp end of the V-shaped magnet 3 in the rotor core 2 and the thickness H of the magnet 3, the V-shaped magnet 3 has an appropriate radial depth. If H1*H / R1 is too small, the sharp end will be too close to the center or the thickness of the magnet 3 will be too thin, which will easily lead to magnetic circuit concentration at the root of the magnet 3, increased magnetic resistance, and insufficient mechanical support strength of the magnet 3. If H1*H / R1 is too large, the sharp end will be too close to the outer edge of the rotor, the V-shape depth will be insufficient, the magnetization effect will be weakened, and the magnetic circuit of the rotor yoke will easily become saturated. Limiting H1*H / R1 to the range of 0.7 to 0.95 can ensure that the radial depth and thickness of the V-shaped magnet 3 are matched, so that the magnetic flux can be smoothly converged inside the rotor core 2 and guided to the air gap, thereby improving the magnetization effect and the anti-demagnetization ability of the magnet 3. Meanwhile, by limiting the ratio between the total width W*B of the magnetic pole 5 and the width H2 of the V-shaped opening, the coverage area of ​​the magnet 3 near the outer edge of the rotor is matched with the span of the opening. This embodiment achieves higher air gap magnetic flux density, thereby reducing motor copper losses and improving motor efficiency. If W*B / H2 is too small, the width of the magnet 3 is insufficient relative to the opening width, the coverage area of ​​the magnetic pole 5 is too small, and the air gap magnetic flux density is reduced. If W*B / H2 is too large, the width of the magnet 3 is too large relative to the opening width, and magnetic circuit interference easily occurs between adjacent magnetic poles 5, resulting in increased leakage flux and wasted magnet 3. Limiting W*B / H2 to the range of 1.3 to 1.5 ensures a good match between the total width of the magnet 3 and the width of the V-shaped opening, so that the magnetic flux is evenly distributed at the opening end, improving the magnetic flux utilization rate.

[0070] In this embodiment, the two relationships mentioned above work together with the aforementioned parameter relationships to comprehensively constrain the radial position, opening width, thickness, width, and number of magnets per pole 3 of the V-shaped magnet 3. Thus, when using the V-shaped magnet 3 structure, the motor can fully utilize the magnetic concentration advantage of the V-shaped structure, achieving higher air gap magnetic flux density, torque density, and operating efficiency while reducing the amount of magnets 3 used. It also takes into account good anti-demagnetization ability, mechanical strength, and process feasibility, further improving the overall performance and cost-effectiveness of the motor.

[0071] See also Figures 1 to 8 As shown, each magnetic pole 5 of the rotor assembly is provided with a first comb hole 41 and a second comb hole 42, and each side of the center line of the magnetic pole 5 is provided with a first comb hole 41 and a second comb hole 42. The first comb hole 41 and the second comb hole 42 are located radially outside the magnet 3. On each side of the center line of the magnetic pole 5, the first comb hole 41 is closer to the center line of the magnetic pole 5 than the second comb hole 42. In a cross section perpendicular to the motor axis, the opposite edges of the first comb hole 41 and the second comb hole 42 on the same side are concave arc segments, and the concave directions of the two concave arc segments are opposite to each other. The cross-sectional area of ​​the first comb hole 41 is larger than the cross-sectional area of ​​the second comb hole 42. Specifically, the edge of the first comb hole 41 near the second comb hole 42 forms a first concave arc segment, and the edge of the second comb hole 42 near the first comb hole 41 forms a second concave arc segment. The first concave arc segment and the second concave arc segment are arranged opposite each other, and the concave directions of the two concave arc segments are opposite to each other.

[0072] In this embodiment, by providing a first magnetic comb hole 41 and a second magnetic comb hole 42 on the radially outer side of the magnet 3, a regular magnetic flux guiding path can be formed in the rotor core 2, effectively limiting the direction of magnetic lines of force, reducing magnetic leakage between the ends of the magnet 3 and adjacent magnetic poles 5, and improving the utilization rate of the magnet 3. The first magnetic comb hole 41 is close to the center line of the magnetic pole 5 and has a large cross-sectional area, which allows the magnetic flux to concentrate in the central region of the magnetic pole 5 and pass smoothly; the second magnetic comb hole 42 is far from the center line of the magnetic pole 5 and has a small cross-sectional area, which can cooperate with the first magnetic comb hole 41 to achieve a smooth transition of the magnetic flux during the propagation from the magnet 3 to the air gap, avoiding excessive saturation of the local magnetic circuit. Meanwhile, the two concave arc segments are set inwards relative to each other, so that the iron core between the first comb hole 41 and the second comb hole 42 forms a magnetic bridge structure with a gradually changing width. This is beneficial to improve the sinusoidal nature of the air gap magnetic flux density waveform, reduce cogging torque and torque fluctuation, improve the smoothness of motor operation, optimize the mechanical strength of the magnetic bridge, avoid stress concentration or structural fatigue caused by an excessively narrow magnetic bridge, and further improve the reliability of the motor under high-speed operation and complex working conditions. Thus, the above-mentioned structural settings of the first comb hole 41 and the second comb hole 42, together with the aforementioned V-shaped arrangement and parameter relationship of the magnet 3, can effectively improve the torque density, operating efficiency and overall reliability of the motor.

[0073] See also Figures 1 to 8 As shown, in a cross section perpendicular to the motor axis, the first comb hole 41 includes a first arc segment 411, a second arc segment 412, and a third arc segment 413. The first arc segment 411 is located at one end of the first comb hole 41 near the outer edge of the rotor core 2, and the second arc segment 412 is located at one end of the first comb hole 41 near the magnet 3. The first arc segment 411 and the second arc segment 412 are connected by the third arc segment 413, which is a concave arc segment. The concave direction of the third arc segment 413 faces the second comb hole 42. The radius of the first arc segment 411 is R3, and the radius of the second arc segment 412 is R4. The radius of the first arc segment 411 is greater than the radius of the second arc segment 412. The line connecting the center of the first arc segment 411 and the center of the second arc segment 412 has an angle G with the center line of the magnetic pole 5. The angle G, radius R3, and radius R4 satisfy: 25°≤G≤30°, 1.3≤R3 / R4≤1.8.

[0074] In this embodiment, in conjunction with the reference Figure 11 and Figure 12 As shown, by limiting the angle G between the line connecting the center of the first arc segment 411 and the center of the second arc segment 412 and the center line of the magnetic pole 5 to within the range of 25° to 30°, the overall extension direction of the first magnetic comb hole 41 is adapted to the magnetic field line direction of the V-shaped magnet 3, ensuring that the magnetic flux can smoothly pass through the magnetic bridge area along the expected path, further reducing leakage magnetic loss. By limiting R3 / R4 to within the range of 1.3 to 1.8, the arc transition ratio on both sides of the first magnetic comb hole 41 is moderate, which can obtain good magnetic focusing and magnetic conduction effects, and also ensure that the magnetic bridge has sufficient structural strength. Therefore, the above-mentioned structure of the first magnetic comb hole 41, together with the aforementioned second magnetic comb hole 42, V-shaped magnet 3, and parameter relationship, can better adjust the magnetic field on the motor magnetic circuit, thereby improving the torque pulsation and radial electromagnetic force when the motor is under load, thus improving the vibration and noise of the motor and compressor. Its core function is to spatially filter and shape the air gap magnetic field by changing the local magnetic reluctance distribution on the rotor surface. This change in physical structure directly affects the spatial harmonic content of the air gap magnetic flux density, thereby weakening the main harmonic components that generate radial electromagnetic force, and ultimately achieving the purpose of reducing torque pulsation and vibration noise. It can further improve the air gap magnetic flux density waveform, reduce cogging torque and torque fluctuation, thereby improving the running stability, efficiency and reliability of the motor.

[0075] See also Figures 1 to 8As shown, in a cross-section perpendicular to the motor axis, the outer edge of the rotor core 2 is provided with a tangent edge 6. The tangent edge 6 is a straight edge, formed by flattening the outer circumference of the rotor core 2 inward, and extends along the axial direction of the rotor core 2. The second comb hole 42 includes two fourth arc segments 421 and one fifth arc segment 422. The two fourth arc segments 421 are located at opposite ends of the second comb hole 42, and are located at opposite ends of the second comb hole 42. The two fourth arc segments 421 are connected by the fifth arc segment 422, which is a concave arc segment. The line connecting the centers of the two fourth arc segments 421 is parallel to the tangent edge 6. The fifth arc segment 422 is the edge of the second comb hole 42 near the first comb hole 41, i.e., the aforementioned concave arc segment opposite to the first comb hole 41. The concave direction of the fifth arc segment 422 faces the first comb hole 41. The line connecting the centers of the two fourth circular arc segments 421 is parallel to the tangent edge 6.

[0076] In this embodiment, by setting a straight tangent 6 on the outer edge of the rotor core 2, the distribution of air gap magnetic permeability along the circumference of the motor can be adjusted, making the air gap magnetic field waveform more gradual, effectively reducing cogging torque and torque fluctuation, and improving the smoothness of motor operation; at the same time, the tangent 6 can reduce the sharp corner effect of the outer edge of the rotor core 2, optimize the magnetic field harmonic distribution, and improve the machinability of the rotor laminations. The second magnetic comb hole 42 adopts a contour structure with a smooth transition between two fourth arc segments 421 and a fifth arc segment 422, and the line connecting the centers of the two fourth arc segments 421 is parallel to the tangent edge 6, so that the extension direction of the second magnetic comb hole 42 is consistent with the extension direction of the tangent edge 6. This ensures that the core wall thickness between the second magnetic comb hole 42 and the outer edge of the rotor core 2 is uniform along the tangent edge 6, avoiding local magnetic circuit saturation or stress concentration caused by abrupt changes in magnetic bridge thickness. This structure, together with the aforementioned first magnetic comb hole 41, V-shaped magnet 3 and parameter relationship, further optimizes the rotor magnetic flux path, reduces leakage flux, improves the utilization rate of magnet 3, and enhances the rotor mechanical strength, thereby improving the torque density, efficiency and high-speed operation reliability of the motor.

[0077] See also Figures 1 to 8 As shown, the motor has an 18-slot, 12-pole structure.

[0078] In this embodiment, the dimensional parameters of the V-shaped magnet 3 and the contour parameters of the first comb hole 41 are limited to the structure of an 18-slot, 12-pole motor, that is, the number of stator slots 102 Q is 18, the number of rotor poles P is 12, and GCD(Q,P)=6, that is, the stator slots 102 and the rotor poles 5 have 6 common cycles in the circumferential direction. When the above-mentioned parameter relationship of the V-shaped magnet 3 is limited to the 18-slot, 12-pole structure, the radial position H1 of the sharp corner of the V-shaped magnet 3, the span H2 of the open end, the thickness H of the magnet 3, the width W of the magnet 3, and the number of magnets 3 pieces per pole B can be precisely matched with the space of the stator slot 102 and the magnetic circuit direction corresponding to each pole 5 under the slot pole. This can ensure that the radial depth of the V-shaped magnet 3 matches the space of the rotor yoke under the pole 5, so that the magnetic flux is evenly distributed along the yoke inside the rotor core 2, avoiding the increase of harmonics and the deterioration of torque fluctuation caused by magnetic circuit asymmetry. The contour parameters R3, R4 and the included angle G of the first comb hole 41 are also optimized for the magnetic field harmonic characteristics of the 18-slot 12-pole structure. The main magnetic field harmonic order of the 18-slot 12-pole structure is related to the greatest common divisor of the number of stator slots 102 and the number of poles. By limiting the ratio of the radius R3 of the first arc segment 411 of the first comb hole 41 to the radius R4 of the second arc segment 412 to between 1.3 and 1.8, and limiting the included angle G between the line connecting the two centers and the center line of the magnetic pole 5 to between 25° and 30°, the magnetic bridge formed by the comb hole can play the optimal magnetic guiding and focusing role in the specific magnetic circuit of the 18-slot 12-pole structure, effectively guiding the direction of magnetic lines of force, suppressing harmonic magnetic fields, reducing leakage magnetic field and iron loss, and ensuring the strength of the rotor structure.

[0079] A compressor includes a motor, wherein the motor is the motor described above.

[0080] An air conditioner includes a compressor, wherein the compressor is the compressor described above.

[0081] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0082] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. An electric motor, characterized in that, include: Stator assembly and rotor assembly; The stator assembly includes a stator core (1), which has a plurality of stator teeth (101). The plurality of stator teeth (101) are circumferentially distributed around the axis of the stator core (1). A stator slot (102) is formed between two adjacent stator teeth (101). In a cross section perpendicular to the motor axis, the outer diameter of the stator core (1) is D1, the inner diameter of the stator core (1) is D2, the number of stator slots (102) is Q, and the slot area of ​​a single stator slot (102) is S. The rotor assembly is coaxially arranged with the stator assembly. The rotor assembly includes a rotor core (2) and a plurality of magnets (3) disposed on the rotor core (2). In a cross section perpendicular to the motor axis, the magnet (3) has an inner sidewall (21) near the center of the rotor core (2) and an outer sidewall (22) near the outer edge of the rotor core (2). The distance between the inner sidewall (21) and the outer sidewall (22) is the width, the maximum dimension perpendicular to the width is the thickness, the thickness of a single magnet (3) is H, the width of a single magnet (3) is W, the number of magnets (3) is A, and the number of poles of the rotor assembly is P. The outer diameter D1, the inner diameter D2, the quantity Q, the groove area S, the thickness H, the width W, the quantity A, and the number of poles P satisfy the following: 55≤ ≤90， Wherein, GCD(Q, P) is the greatest common divisor of the quantity Q and the number of poles P, the units of the outer diameter D1, the inner diameter D2, the thickness H, and the width W are mm, and the unit of the groove area S is mm. 2 .

2. The motor according to claim 1, characterized in that, The cross-section of the magnet (3) is rectangular, the thickness direction is the short side direction, the width direction is the long side direction, and the dimension in the width direction is greater than the dimension in the thickness direction.

3. The motor according to claim 1, characterized in that, The air gap between the stator assembly and the rotor assembly is B, and the air gap B satisfies: 0.45mm≤B≤0.6mm.

4. The motor according to claim 1, characterized in that, The magnet (3) is arranged in a V-shape, and each magnetic pole (5) of the rotor assembly is provided with a magnet (3). In a cross section perpendicular to the motor axis, the magnet (3) includes a first magnet arm (31) and a second magnet arm (32). One end of the first magnet arm (31) and the second magnet arm (32) are close to each other and face the center of the rotor core (2). The other end of the first magnet arm (31) and the second magnet arm (32) face the outer edge of the rotor core (2).

5. The motor according to claim 4, characterized in that, The angle between the first magnet arm (31) and the second magnet arm (32) facing the outer edge of the rotor core (2) is the magnet angle θ, and the thickness H of the magnet (3) and the magnet angle θ satisfy: 1mm≤H≤1.3mm, 80°≤θ≤120°.

6. The motor according to claim 3 or 5, characterized in that, The motor is either an 18-slot 12-pole motor or a 15-slot 10-pole motor.

7. The motor according to claim 1, characterized in that, When the magnet (3) is a V-shaped magnet (3), the pointed end of the magnet (3) is close to the center of the rotor core (2), the open end of the magnet (3) is close to the outer edge of the rotor core (2), the straight distance between the pointed end of the magnet (3) and the center of the rotor core (2) is H1, the straight distance between the two ends of the open end of the magnet (3) is H2, the radius of the rotor core (2) is R1, and the number of magnet (3) plates per magnetic pole (5) of the rotor core (2) is B. The straight distance H1, the straight distance H2, the radius R1 and the number of plates B satisfy: 0.7≤H1*H / R1≤0.95, and 1.3≤W*B / H2≤1.

5.

8. The motor according to claim 1, characterized in that, Each magnetic pole (5) of the rotor assembly is provided with a first comb hole (41) and a second comb hole (42), and each side of the center line of the magnetic pole (5) is provided with a first comb hole (41) and a second comb hole (42). The first comb hole (41) and the second comb hole (42) are located on the radial outer side of the magnet (3). On each side of the center line of the magnetic pole (5), the first comb hole (41) is closer to the center line of the magnetic pole (5) than the second comb hole (42). In a cross section perpendicular to the motor axis, the edges of the first comb hole (41) and the second comb hole (42) on the same side are concave arc segments. The concave directions of the two concave arc segments are opposite to each other, and the cross-sectional area of ​​the first comb hole (41) is larger than the cross-sectional area of ​​the second comb hole (42).

9. The motor according to claim 8, characterized in that, In a cross section perpendicular to the motor axis, the first comb hole (41) includes a first arc segment (411), a second arc segment (412), and a third arc segment (413). The first arc segment (411) is located at one end of the first comb hole (41) near the outer edge of the rotor core (2), and the second arc segment (412) is located at one end of the first comb hole (41) near the magnet (3). The first arc segment (411) and the second arc segment (412) are connected by the third arc segment (413), which is the concave arc segment. The radius of the first arc segment (411) is R3, and the radius of the second arc segment (412) is R4. The radius of the first arc segment (411) is greater than the radius of the second arc segment (412). The line connecting the center of the first arc segment (411) and the center of the second arc segment (412) has an angle G with the center line of the magnetic pole (5). The angle G, the radius R3 and the radius R4 satisfy: 25°≤G≤30°, 1.3≤R3 / R4≤1.

8.

10. The motor according to claim 8, characterized in that, In a cross section perpendicular to the motor axis, the outer edge of the rotor core (2) is provided with a tangent (6), which is a straight edge; the second comb hole (42) includes two fourth arc segments (421) and a fifth arc segment (422). The two fourth arc segments (421) are located at the two ends of the second comb hole (42), and the two fourth arc segments (421) are connected by the fifth arc segment (422). The fifth arc segment (422) is the concave arc segment, and the line connecting the centers of the two fourth arc segments (421) is parallel to the tangent (6).

11. The motor according to any one of claims 7 to 10, characterized in that, The motor is an 18-slot, 12-pole motor.

12. A compressor, comprising a motor, characterized in that, The motor is the motor according to any one of claims 1 to 11.

13. An air conditioner, comprising a compressor, characterized in that, The compressor is the compressor described in claim 12.

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