Rotors, motors and compressors

Abstract

This utility model discloses a rotor, a motor, and a compressor, relating to the field of motor technology. The motor includes a permanent magnet and a rotor core. The rotor core is provided with pole slot groups, inter-pole magnetic barrier slots, and magnetic barrier recesses. Each pole slot group has a d-axis; adjacent pole slot groups are connected by a q-axis. The line connecting the endpoint of the magnetic steel slot of each pole slot group furthest from its d-axis to the rotor's rotation center forms an angle α with the d-axis, and the angle formed by the adjacent q-axis is β. The maximum distance from the magnetic steel slot to the rotor's outer circle is h, the maximum radial depth of the inter-pole magnetic barrier slot is L, the rotor's outer circle radius is R1, the minimum radius of the curve on the magnetic barrier recess is R2, and the maximum radius of the curve of the inter-pole magnetic barrier slot near the rotor's outer circle is R3. The technical solution provided by this utility model balances the magnetic barrier effect and mechanical strength by constraining the above parameters, ensuring that the rotor's structural stability is not affected while reducing iron loss.

Description

Technical Field

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

[0002] APF stands for Annual Energy Efficiency Ratio. APF not only reflects energy consumption levels but is also directly related to the synergistic efficiency of core components such as the compressor, condenser, and throttling devices. A higher APF value indicates a higher energy conversion rate and better energy-saving performance throughout the year.

[0003] As the power component of a compressor, the electric motor faces increasingly stringent energy efficiency requirements. Current compressors need further improvement in their active power factor (APF). Motor losses include copper losses and iron losses, with armature iron losses being the primary component. Increased armature iron losses directly lead to higher total motor losses, thereby reducing motor efficiency. Utility Model Content

[0004] The main purpose of this invention is to propose a rotor, motor, and compressor, which aims to reduce motor losses by optimizing motor design, thereby improving motor efficiency and ultimately increasing the compressor's APF (Advanced Power Factor).

[0005] To achieve the above objectives, the rotor proposed in this utility model comprises: Permanent magnets; and A rotor core is provided with magnetic pole slots, inter-pole magnetic barrier slots, and magnetic barrier recesses. The magnetic pole slots are evenly distributed along the circumference of the rotor core, each magnetic pole slot corresponding to one magnetic pole. Each magnetic pole slot includes at least two magnetic steel slots, and permanent magnets are disposed in all magnetic steel slots. Inter-pole magnetic barrier slots are disposed between two adjacent magnetic pole slots. The magnetic barrier recesses are disposed on the outer edge of the rotor between two magnetic pole slots, extending along the rotor axial direction. Each magnetic barrier recess corresponds to one inter-pole magnetic barrier slot. The magnetic barrier recesses are open... The opening faces outward from the rotor; each magnetic pole slot group has a d-axis; adjacent magnetic pole slot groups have a q-axis; the line connecting the endpoint of the magnetic steel slot away from its d-axis to the rotor rotation center of each magnetic pole slot group forms an angle α with the d-axis, and the angle formed with the q-axis adjacent to the connecting line is β; the maximum distance from the magnetic steel slot to the outer circle of the rotor is h, the maximum radial depth of the inter-pole magnetic barrier slot is L, the radius of the outer circle of the rotor is R1, the minimum radius of the curve on the magnetic barrier recess area to the rotor center is R2, and the maximum radius of the curve of the inter-pole magnetic barrier slot near the outer circle of the rotor to the rotor center is R3; The rotor satisfies the following parameter relationship: , ; Where α and β are in °, h, L, R1, R2, and R3 are in mm, the d-axis is the magnetic pole center line passing through the rotor center of the magnetic pole slot group, and the q-axis is the inter-pole center line passing through the rotor center between adjacent magnetic pole slot groups.

[0006] In one embodiment, 0.1 ≤ β / α ≤ 0.25.

[0007] In one embodiment, the minimum distance between the inter-pole magnetic barrier slot and the magnet slot of the adjacent magnetic pole slot group is s: 0.4mm≤s≤1mm.

[0008] In one embodiment, 0.1 ≤ h / R1 ≤ 0.4.

[0009] In one embodiment, the rotor core further includes magnetic flux slots located on the rotor core and within the area defined by the magnetic pole slot group and the outer periphery of the rotor.

[0010] In one embodiment, the rotor core has a shaft hole, and the rotor core further includes flow passage holes located in the outer peripheral region of the shaft hole, and a plurality of flow passage holes are evenly spaced along the circumferential direction of the shaft hole.

[0011] In one embodiment, the rotor core further includes rivet holes, a plurality of which are spaced apart along the circumferential direction of the rotor core and are located radially between the flow hole and the magnetic pole slot group.

[0012] In one embodiment, the rotor has p pole pairs, where 2 ≤ p ≤ 5.

[0013] In one embodiment, the rotor core comprises a plurality of rotor laminations stacked along the axial direction of the rotor core.

[0014] In one embodiment, the magnetic pole slot group has a V-shaped or U-shaped structure.

[0015] This utility model also proposes a permanent magnet motor, including the rotor as described above.

[0016] This utility model also proposes a compressor, including the permanent magnet motor described above.

[0017] This invention reduces armature iron loss and optimizes rotor magnetic field distribution by setting recessed areas and inter-pole magnetic barrier slots. This reduces alternating magnetic flux density in the armature core, lowers hysteresis and eddy current losses (armature iron loss), and improves motor efficiency. When leakage flux between adjacent poles passes through the inter-pole magnetic barrier slot area, the presence of the magnetic barrier slot (non-magnetic area) increases magnetic resistance, partially blocking the leakage flux, reducing the alternating magnetic flux component in the armature core, and blocking the leakage flux path. The recessed structure at the outer edge of the rotor increases the air gap in this area, slows down the magnetic field gradient, reduces magnetic flux density fluctuations at the edge of the armature core, thereby reducing eddy current losses and optimizing the edge magnetic field distribution. Through parameter constraints, the magnetic barrier effect and mechanical strength are balanced, ensuring that rotor structural stability is not affected while reducing iron loss. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the structure of an embodiment of the rotor core provided by this utility model; Figure 2 A schematic diagram of another embodiment of the rotor core provided by this utility model; Figure 3 A comparison chart of armature iron losses between the motor before and after the improvement; Figure 4 This is a comparison chart of the motor efficiency before and after the improvement.

[0020] Explanation of icon numbers: 100. Permanent magnet; 200, Rotor core; 201, Shaft hole; 210, Magnetic pole slot group; 211, Magnet slot; 220, Inter-pole magnetic barrier slot; 230, Magnetic barrier recessed area; 240, Magnetic bundle slot; 250, Flow hole; 260, Rivet hole.

[0021] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] This utility model proposes a rotor, a motor, and a compressor.

[0026] Please see Figure 1 and Figure 2In one embodiment of this utility model, the rotor includes a permanent magnet 100 and a rotor core 200. The rotor core 200 is provided with magnetic pole slot groups 210, inter-pole magnetic barrier slots 220, and magnetic barrier recessed areas 230. The magnetic pole slot groups 210 are evenly distributed circumferentially along the rotor core 200, each magnetic pole slot group 210 corresponds to one magnetic pole, and each magnetic pole slot group 210 includes at least two magnetic steel slots 211. The permanent magnet 100 is disposed in all magnetic steel slots 211. The inter-pole magnetic barrier slots 220 are disposed between two adjacent magnetic pole slot groups 210. The magnetic barrier recessed areas 230 are disposed on the outer edge of the rotor between two magnetic pole slot groups 210 and extend along the rotor axial direction. The magnetic barrier recessed areas 230 and the inter-pole magnetic barrier slots 220 are connected. One-to-one correspondence; the opening of the magnetic barrier recess 230 faces outward from the rotor; each magnetic pole slot group 210 has a d-axis; adjacent magnetic pole slot groups 210 have a q-axis; the line connecting the endpoint of the magnetic steel slot 211 of each magnetic pole slot group 210 away from its d-axis and the rotor rotation center (denoted as M), the angle formed by M and the d-axis is α, and the angle formed by the q-axis adjacent to the connecting line is β; the maximum distance from the magnetic steel slot 211 to the outer circle of the rotor is h, the maximum radial depth of the inter-pole magnetic barrier slot 220 is L, the radius of the outer circle of the rotor is R1, the minimum radius of the curve on the magnetic barrier recess 230 is R2, the maximum radius of the curve of the inter-pole magnetic barrier slot 220 near the outer circle of the rotor is R3, and the centers of R1, R2, and R3 coincide; the rotor satisfies the following parameter relationships: , Where α and β are in °, h, L, R1, R2, and R3 are in mm, d-axis is the magnetic pole center line of the magnetic pole slot group 210 passing through the rotor center, and q-axis is the inter-pole center line between adjacent magnetic pole slot groups 210 passing through the rotor center.

[0027] By constraining the product of the angle distribution ratio β / (α+β) and the radial dimension ratio (R1-R2) / (R2-R3), the synergistic optimization effect of the magnetic field between the magnetic barrier recess 230 and the interpole magnetic barrier slot 220 is ensured.

[0028] The ratio β / (α+β) represents the proportion of the concave region angle β in the entire interelectrode region angle (α+β). For example, if β=15° and α+β=30°, the ratio is 0.5, indicating that the concave region occupies half of the interelectrode region's angular space. Ensuring a reasonable layout of the concave region within the interelectrode angle range is crucial to avoid distortion of the air gap magnetic field due to excessively large angles, or weakening the harmonic suppression effect due to excessively small angles.

[0029] Molecular R1-R2: The difference between the rotor outer circle radius R1 and the minimum radius R2 of the recessed area, which is the radial depth of the recessed area (the distance from the rotor outer circle to the bottom of the recessed area).

[0030] Denominator R2-R3: The difference between the minimum radius R2 of the recessed region and the maximum radius R3 of the inter-pole magnetic barrier groove 220, i.e., the radial depth of the inter-pole magnetic barrier groove 220 (the distance from the bottom of the recessed region to the top of the inter-pole magnetic barrier groove 220). This ratio characterizes the relative relationship between the depth of the recessed region and the depth of the inter-pole magnetic barrier groove 220, reflecting the degree of matching between the two in radial dimensions. For example, if the depth of the recessed region is 2mm and the depth of the inter-pole magnetic barrier groove 220 is 1mm, the ratio is 2, indicating that the depth of the recessed region is twice that of the inter-pole magnetic barrier groove 220. Lower limit 0.05: Ensures that the synergistic effect between the recessed region and the inter-pole magnetic barrier groove 220 is not lower than the threshold (avoiding the failure of magnetic field control due to excessively small angle or size ratio); Upper limit 0.5: Avoids excessive control leading to weakening of the main magnetic flux (preventing the effective magnetic flux density from decreasing due to excessively large angle or size ratio).

[0031] 0.25≤L / h≤0.5, greater than 0.25 to ensure sufficient depth of the magnetic barrier groove; less than 0.5 to avoid excessive depth of the magnetic barrier groove leading to a decrease in the mechanical strength of the rotor.

[0032] It should be noted that: The magnetic pole slot group 210 is a collection of magnetic steel slots 211 that are evenly distributed around the rotor core 200 and correspond to a single magnetic pole. Each magnetic pole slot group 210 contains at least two magnetic steel slots 211 for embedding permanent magnets 100 and forming a complete magnetic pole.

[0033] The inter-pole magnetic barrier slot 220 is a slot-shaped structure set between two adjacent magnetic pole slot groups 210 to block inter-pole leakage magnetic flux and optimize the magnetic field distribution.

[0034] The magnetic barrier recess 230 is a recessed structure located on the outer edge of the rotor between the two magnetic pole slot groups 210, extending axially, and corresponds one-to-one with the inter-pole magnetic barrier slot 220, with its opening facing the stator ("outer side of the rotor" means the direction in which the stator is located in the motor).

[0035] The d-axis is the magnetic pole centerline passing through the rotor center. Each magnetic pole slot group 210 has its own dedicated d-axis (corresponding only to its own magnetic pole), which is not a globally unified d-axis.

[0036] The q-axis is the inter-pole centerline passing through the rotor center and located between two adjacent magnetic pole slot groups 210. Each inter-pole region has its own dedicated q-axis.

[0037] This scheme uses angle and size parameters to constrain the spatial position and geometric dimensions of the recessed area and the inter-pole magnetic barrier slot 220, thereby achieving the goals of optimizing the air gap magnetic field and reducing armature iron loss. Regarding the parameters: α: The angular range between the point of the magnet slot furthest from the d-axis and the d-axis (reflecting the spatial position of the magnet slot in the d-axis direction), in degrees. Reflects the magnetic field strength distribution of the permanent magnet 100 along the direction of the magnetic pole centerline.

[0038] β is the angle between the point of the magnet slot furthest from the d-axis and the q-axis (reflecting the spatial position of the magnet slot in the q-axis direction), and the unit is °.

[0039] β / (α+β) is the angular proportion in the q-axis direction, which characterizes the distribution ratio of the magnetic field in the quadrature axis (q-axis) direction and affects the generation region of alternating magnetic flux.

[0040] h is the depth of the magnet slot 211, which determines the distance between the permanent magnet 100 and the outer circle of the rotor, and affects the main magnetic flux density.

[0041] L represents the depth of the inter-pole magnetic barrier groove 220, which controls the obstruction effect of the inter-pole leakage magnetic flux. The greater the depth, the stronger the magnetic resistance.

[0042] R1-R2 represents the maximum depth of the magnetic barrier recess 230 (the difference between the rotor outer circle radius R1 and the minimum radius R2 of the recess), in mm. It represents the radial dimension of the magnetic barrier recess 230 from the outer circle to the deepest point, and affects the magnetic field gradient at the edge of the rotor outer circle.

[0043] R2-R3 are the connection dimensions between the interpole magnetic barrier groove 220 and the recessed area, and the two work together to regulate the transition effect of the magnetic field.

[0044] L / h is the ratio of the depth of the interpole magnetic barrier groove 220 to the depth of the magnet groove 211, reflecting the matching relationship between the magnetic barrier structure and the magnetic field source (permanent magnet 100), ensuring that the leakage flux blocking effect is matched with the main magnetic flux intensity.

[0045] This invention improves motor efficiency by optimizing the rotor magnetic field distribution, reducing alternating magnetic flux density in the armature core, lowering hysteresis and eddy current losses (armature iron losses). When leakage flux between adjacent poles passes through the inter-pole magnetic barrier slot 220 region, the presence of the slot (a non-magnetic region) increases magnetic resistance, partially blocking the leakage flux, reducing the alternating magnetic flux component in the armature core, and blocking the leakage flux path. The concave structure at the outer edge of the rotor increases the air gap in this region, slowing the magnetic field gradient, reducing magnetic flux density fluctuations at the armature core edge, thereby reducing eddy current losses and optimizing the edge magnetic field distribution. Through parameter constraints, the magnetic barrier effect and mechanical strength are balanced, ensuring that rotor structural stability is not affected while reducing iron losses.

[0046] For parameter measurement, please refer to the following: Angle parameters α and β are used to determine the endpoint of the target magnet slot 211 that is far from the d-axis of its magnetic pole slot group 210 (denoted as point A); connect point A with the rotor rotation center (O) to obtain line segment OA; α: measure the angle between OA and the d-axis of the magnetic pole slot group 210 (OA is the initial side, d-axis is the final side, counterclockwise direction); β: measure the angle between OA and the adjacent q-axis (OA is the initial side, q-axis is the final side, clockwise direction).

[0047] The radial dimensions h, L, R1, R2, and R3 are determined using calipers, micrometers, and other tools, with the rotor's rotation center as the reference.

[0048] h: The maximum radial distance from the bottom of the magnet slot 211 to the outer circle of the rotor (the distance from the deepest point of the magnet slot 211 along the radial direction to R1). L: The maximum radial depth of the inter-pole magnetic barrier groove 220 from the outer edge of the rotor towards the center (the radial distance from the bottom of the inter-pole magnetic barrier groove 220 to the opening). R1: Rotor outer circle radius (distance from center O to the edge of the rotor outer circle); R2: The minimum radius of the 230 curve of the magnetic barrier depression (the distance from the center O to the deepest point of the depression). R3: The maximum radius of the curve of the inter-pole magnetic barrier slot 220 near the outer circle (the distance from the center O to the edge of the opening of the inter-pole magnetic barrier slot 220); the centers of R1, R2, and R3 are all the rotor rotation center O.

[0049] Specifically, 0.1 ≤ β / α ≤ 0.25. The d-axis is the center line of the magnetic poles. β / α ≤ 0.25, by limiting the q-axis angle proportion, ensures that the magnetic field of the magnet slot 211 is mainly concentrated along the d-axis direction, preventing the magnetic flux from diffusing towards the q-axis (inter-pole direction). The magnetic flux in the q-axis direction is prone to alternation due to motor rotation, leading to hysteresis and eddy current losses in the armature core. β / α ≥ 0.1 ensures that an appropriate angular space is retained in the q-axis direction, coordinating with the "obstruction-guidance" effect of the inter-pole magnetic barrier slot 220 and the magnetic barrier recess region 230 on the q-axis magnetic flux. Through the independent constraint of β / α, the angular orientation of the magnet slot 211 is further fixed, ensuring the control effect of the inter-pole magnetic barrier slot 220 and the magnetic barrier recess region 230 on the q-axis magnetic flux.

[0050] Specifically, the minimum distance s between the inter-pole magnetic barrier groove 220 and the magnet slots of the adjacent magnetic pole slot group 210 is 0.4mm ≤ s ≤ 1mm. s refers to the minimum straight-line distance between the inner wall of the inter-pole magnetic barrier groove 220 and the inner wall of the magnet slot in the adjacent magnetic pole slot group 210 (i.e., the minimum thickness of the iron core between the two slots). If the inter-pole magnetic barrier groove 220 is located between magnetic pole A and magnetic pole B, then s is the minimum of the closest distance between the magnetic barrier groove and the closest distance between the magnetic barrier groove and the magnetic groove near magnetic pole A. Lower limit 0.4mm: The minimum allowable distance between the magnetic barrier groove and the magnet slot (cannot be less than 0.4mm).

[0051] Upper limit 1mm: The maximum allowable distance between the magnetic barrier slot and the magnet slot (cannot be greater than 1mm); by limiting the range of values ​​of s, the balance between blocking leakage magnetic flux and ensuring structural strength / magnetic field efficiency is ensured in the inter-pole magnetic barrier slot 220.

[0052] If s < 0.4 mm, the core between the inter-pole magnetic barrier slot 220 and the magnet slot is too thin (equivalent to a narrow "magnetic bridge"), and the magnetic circuit in this area is prone to saturation due to excessive magnetic flux density. After saturation, the permeability decreases, and the efficiency of the main magnetic flux (transmitted along the d-axis from the permanent magnet 100 in the magnet slot) decreases, resulting in a decrease in motor output. If s > 1 mm, the core between the inter-pole magnetic barrier slot 220 and the magnet slot is too thick, and the magnetic resistance is too small. The leakage flux (ineffective magnetic flux between adjacent magnetic poles) will be transmitted in large quantities through this thick magnetic bridge and cannot be effectively blocked by the magnetic barrier slot. The increase in leakage flux will lead to an increase in the alternating magnetic flux component in the armature core, and an increase in hysteresis loss and eddy current loss (armature iron loss). Specifically, 0.1 ≤ h / R1 ≤ 0.4. The ratio of the depth of the magnet slot 211 to the outer radius of the rotor characterizes the embedding ratio of the permanent magnet 100 in the radial direction of the rotor. By limiting the ratio of the embedding depth of the permanent magnet 100 to the overall size of the rotor, the magnetic field strength, mechanical strength, and iron loss are balanced. If h / R1 < 0.1, the magnet slot 211 is too shallow (the permanent magnet 100 is too close to the outer radius of the rotor), the volume of the permanent magnet 100 is insufficient, the main magnetic flux density is too low, the motor output torque decreases, and the efficiency decreases. The lower limit of 0.1 is the minimum embedding ratio to ensure the basic magnetic flux strength (matching the material characteristics of the permanent magnet 100, such as the magnetic flux density requirement of the neodymium iron boron permanent magnet 100). If h / R1 > 0.4, the magnet slot 211 is too deep (the permanent magnet 100 is close to the rotor center), and the magnetic conduction path of the rotor core 200 is too short. The magnetic flux density is likely to exceed the saturation magnetic flux density of the core material (such as silicon steel sheet) (usually 1.5-1.8T). After saturation, the permeability decreases, the main magnetic flux transmission efficiency decreases, which leads to insufficient motor output, and the alternating magnetic flux loss in the saturation region will increase significantly.

[0053] The outer circular wall of the rotor is a key structure for withstanding centrifugal force. If h is too large (h / R1>0.4) and the thickness of the outer circular wall (R1-h) is too small, it is prone to plastic deformation or fracture due to centrifugal force during high-speed rotation. If h / R1<0.1, the depth of the magnet slot 211 is insufficient, and the permanent magnet 100 is prone to detach from the slot due to centrifugal force when the rotor rotates, causing rotor dynamic balance failure or damage to the permanent magnet 100.

[0054] Furthermore, the rotor core 200 also includes a magnetic flux slot 240, which is located on the rotor core 200 and within the area defined by the magnetic pole slot group 210 and the outer periphery of the rotor. The magnetic flux slot 240 is located between the magnetic pole slot group 210 (the magnetic field source region of the embedded permanent magnet 100) and the outer edge of the rotor, in the transition region outside the magnetic steel slot 211 and close to the outer periphery of the rotor. The magnetic flux slot 240 extends circumferentially along the rotor core 200, surrounding the outer side of the magnetic pole slot group 210, forming a "magnetic flux guiding ring" between the magnetic pole structure and the outer circle of the rotor. This guides and optimizes the magnetic flux path, indirectly helping to reduce armature iron loss by adjusting the magnetic field distribution, avoiding excessively high (magnetic saturation risk) or excessively low (insufficient magnetic field utilization) local density of the main magnetic flux due to chaotic paths, and ensuring that more magnetic flux participates in effective electromagnetic conversion (improving motor output and efficiency). The magnetic flux slots 240 are "empty slot structures" (without embedded permanent magnets 100 or magnetically conductive materials), utilizing the low permeability (high magnetic reluctance) of air to block leakage flux, while simultaneously reducing rotor weight (improving dynamic performance). Their number is 2-4 times the number of pole pairs, circumferentially staggered at the pole edges, avoiding the d-axis / q-axis.

[0055] Furthermore, the rotor core 200 has a shaft hole 201 and also includes flow passage holes 250. The flow passage holes 250 are located in the outer peripheral region of the shaft hole 201 and are evenly spaced along the circumferential direction of the shaft hole 201. The radial position of the flow passage holes 250 is between the rotor central shaft hole 201 (the main hole for mounting the shaft) and the magnetic pole slot group 210, belonging to the inner region of the rotor core 200 (magnetic field control structures far from the outer edge, such as the inter-pole magnetic barrier slot 220, magnetic barrier recess 230, etc.). The flow passage holes 250 are arranged in a ring array with the shaft hole 201 as the center, and the number is usually 3-8 (adjusted according to rotor size and heat dissipation requirements). The included angle between adjacent flow passage holes 250 is equal (e.g., 4 flow passage holes 250 are spaced 90° apart). The cross-sectional shape is mostly circular (easy to process, uniform stress distribution), but a waist-shaped or elliptical shape can also be used (to enhance ventilation area). The circumferentially evenly spaced flow holes ensure mass balance during rotor rotation (avoiding vibration caused by uneven centrifugal force distribution). The flow holes 250 reduce the material usage of the rotor core 200 (weight reduction), lower the moment of inertia, and reduce energy consumption during motor start / brake, thus improving acceleration performance (especially suitable for scenarios with frequent start-stop cycles). Furthermore, the evenly distributed flow holes 250 can assist in rotor dynamic balancing (replacing some of the balancing hole functions) by adjusting the hole diameter or number, reducing vibration and noise during high-speed rotation. Located inside the rotor (away from the magnetic pole slot group 210 and the outer circular magnetic field control structure), the flow holes 250 do not cut the main magnetic flux path or increase leakage flux, and their impact on the magnetic field distribution is negligible.

[0056] Furthermore, the rotor core 200 also includes rivet holes 260. Multiple rivet holes 260 are spaced apart along the circumferential direction of the rotor core 200, and are located radially between the flow-through hole 250 and the magnetic pole slot group 210. The rivet holes 260 are located in the radial intermediate transition region of the rotor core 200, specifically: multiple rivet holes are spaced apart along the circumference of the rotor core 200, and are located radially between the flow-through hole 250 (inner side, near the shaft hole 201) and the magnetic pole slot group 210 (outer side, near the outer circle of the rotor). The inner side maintains a certain distance from the flow-through hole 250 (to avoid interference with the flow-through hole 250), and the outer side does not intrude into the magnetic steel slot 211 area of ​​the magnetic pole slot group 210 (to prevent weakening the magnetic field source structure), forming a radial hierarchical distribution of "shaft hole 201, flow-through hole 250, rivet holes 260, magnetic pole slot group 210, and rotor outer circle edge". Rivet holes 260 are evenly spaced along the circumference of the rotor core 200 (e.g., 4-8 holes, adjusted according to the rotor diameter and the number of laminations) to ensure uniform distribution of the pressing force on the laminated laminations. They are typically circular (for ease of machining and uniform stress distribution) and completely penetrate the rotor core 200 along the axial direction (laminate stacking direction) to ensure that rivets can pass through all laminated laminations, achieving overall pressing. The rotor core 200 is composed of multiple thin-plate rotor laminations (such as silicon steel sheets) stacked axially. The rivet holes 260, through which rivets (usually solid metal rivets) are inserted, tightly press all laminations into a single structure, preventing relative sliding or separation of the laminations due to centrifugal force during high-speed rotation. After the laminations are fixed by the rivet holes 260, the cylindricity and coaxiality of the rotor core 200 are guaranteed (avoiding core eccentricity caused by lamination loosening), thereby maintaining the uniformity of the air gap between the rotor and stator.

[0057] Furthermore, to balance performance, structure, and cost, the rotor has p pole pairs, where 2 ≤ p ≤ 5. The number of pole pairs p directly determines the number of permanent magnets 100, pole slot groups 210, and inter-pole magnetic barrier slots 220 (e.g., when p = 5, 10 pole slot groups 210 and 10 inter-pole magnetic barrier slots 220 are required). When p > 5, the number of slot / hole structures (magnetic steel slots 211, magnetic barrier slots, rivet holes 260, etc.) on the rotor core 200 increases, making manufacturing more difficult.

[0058] Furthermore, the rotor's topology is V-shaped or U-shaped. V-shaped and U-shaped are typical arrangement topologies of the pole slot groups 210 in a permanent magnet motor rotor. For example, each pole slot group 210 contains two symmetrically distributed magnet slots 211, forming a "V" angle (the opening can face the rotor center or outer circle), and the magnets embedded in the slots form a "V-shaped pole." Alternatively, each pole slot group 210 may contain two or three magnet slots 211, forming a "U" shape (the opening faces the rotor outer circle), and the magnets embedded in these slots form a "U-shaped surrounding pole."

[0059] This utility model also proposes a permanent magnet motor, which includes a rotor. The specific structure of the rotor is as described in the above embodiments. Since this permanent magnet motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here. By reducing armature iron loss (hysteresis / eddy current loss) and improving magnetic field utilization, the efficiency of the permanent magnet motor is improved.

[0060] Reference Figure 3 , Figure 3 This diagram illustrates the difference in armature iron loss between motors using the rotor of this invention and those not using the rotor of this invention at different speeds. The horizontal axis (X-axis) represents the motor speed, including two typical operating points: 1800 rpm (low speed) and 3600 rpm (high speed); the vertical axis (Y-axis) represents the armature iron loss (unit: W), with a value range of 0-5.0 W. From... Figure 3 As can be seen, under low-speed conditions (1800 rpm), at low speeds, the rotor of this invention optimizes the magnetic field distribution through structures such as the inter-pole magnetic barrier slot 220 and the magnetic barrier recess region 230, reducing magnetic flux fluctuations in the armature core, thereby reducing hysteresis loss and iron loss: (1.3) 1.0) / 1.3≈23%. Under high-speed conditions (3600 rpm), the V / U-shaped topology and magnetic field control structure of the rotor of this invention (such as the magnetic flux slot 240) effectively suppress eddy current losses (a key factor in the increase of iron loss with the square of the rotational speed), resulting in a much lower increase in iron loss than the control group, and a reduction in iron loss: (3.8) 1.9) / 3.8=50%. Therefore, regardless of low speed (1800rpm) or high speed (3600rpm), the armature iron loss of the motor using the rotor of this utility model is significantly reduced, especially at high speed, the reduction is up to 50%. The reduction in iron loss directly reduces the total loss of the motor, which can improve efficiency (especially at high speed), reduce temperature rise (delay insulation aging), extend life, and at the same time provide space for motor miniaturization and cost optimization.

[0061] Reference Figure 4 , Figure 4 This illustrates the difference in motor efficiency between motors using the rotor of this invention and those not using the rotor of this invention at different speeds. The horizontal axis (X-axis) represents the motor speed, including two typical operating points: 1800 rpm (low speed) and 3600 rpm (high speed); the vertical axis (Y-axis) represents the motor efficiency (unit: %), with a value range of 92.0%-96.0%. From Figure 4As can be seen, at low speed (1800 rpm), the rotor of this invention optimizes the magnetic field distribution through structures such as the inter-pole magnetic barrier slot 220 and the magnetic barrier recess region 230, reducing armature iron loss (as shown in the iron loss comparison diagram above, iron loss is reduced by 23% at 1800 rpm), indirectly improving efficiency. At high speed (3600 rpm), the V / U-shaped topology and magnetic field control structure of the rotor of this invention (such as the magnetic flux slot 240) effectively suppress eddy current losses (iron loss is reduced by 50% at 3600 rpm), and the efficiency improvement is greater than that at low speed. Those motors that do not use the rotor of this invention refer to motors whose rotor structure does not apply the above innovative design and are typically conventional or traditional rotor structures.

[0062] This utility model also proposes a compressor including a permanent magnet motor. The specific structure of the permanent magnet motor is as described in the above embodiments. Since this permanent magnet motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here. Among them, the improvement of motor efficiency directly reduces the compressor input power and improves the compressor performance.

[0063] This utility model also proposes a refrigeration device (such as an air conditioner or a refrigerator), which includes the above-mentioned compressor or permanent magnet motor. Since this refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0064] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A rotor, characterized in that, include: permanent magnet; and A rotor core is provided with magnetic pole slots, inter-pole magnetic barrier slots, and magnetic barrier recesses. The magnetic pole slots are evenly distributed along the circumference of the rotor core, each magnetic pole slot corresponding to one magnetic pole. Each magnetic pole slot includes at least two magnetic steel slots, and permanent magnets are disposed in all magnetic steel slots. Inter-pole magnetic barrier slots are disposed between two adjacent magnetic pole slots. The magnetic barrier recesses are disposed on the outer edge of the rotor between two magnetic pole slots, extending along the rotor axial direction. Each magnetic barrier recess corresponds to one inter-pole magnetic barrier slot. The magnetic barrier recesses are open... The opening faces outward from the rotor; each magnetic pole slot group has a d-axis; adjacent magnetic pole slot groups have a q-axis; the line connecting the endpoint of the magnetic steel slot away from its d-axis to the rotor rotation center of each magnetic pole slot group forms an angle α with the d-axis, and the angle formed with the q-axis adjacent to the connecting line is β; the maximum distance from the magnetic steel slot to the outer circle of the rotor is h, the maximum radial depth of the inter-pole magnetic barrier slot is L, the radius of the outer circle of the rotor is R1, the minimum radius of the curve on the magnetic barrier recess area to the rotor center is R2, and the maximum radius of the curve of the inter-pole magnetic barrier slot near the outer circle of the rotor to the rotor center is R3; The rotor satisfies the following parameter relationship: ， ； Where α and β are in °, h, L, R1, R2, and R3 are in mm, the d-axis is the magnetic pole center line passing through the rotor center of the magnetic pole slot group, and the q-axis is the inter-pole center line passing through the rotor center between adjacent magnetic pole slot groups.

2. The rotor as claimed in claim 1, characterized in that, 0.1≤β / α≤0.25。 3. The rotor as described in claim 1, characterized in that, The minimum distance between the inter-pole magnetic barrier slot and the magnet slot of the adjacent magnetic pole slot group is s: 0.4mm≤s≤1mm.

4. The rotor as claimed in claim 1, characterized in that, 0.1≤h / R1≤0.

4.

5. The rotor as claimed in claim 1, characterized in that, The rotor core also includes magnetic flux slots, which are located on the rotor core and within the area defined by the magnetic pole slot group and the outer periphery of the rotor.

6. The rotor as claimed in claim 1, characterized in that, The rotor core has a shaft hole and a flow passage hole. The flow passage hole is located in the outer peripheral region of the shaft hole and is evenly spaced in multiple places along the circumferential direction of the shaft hole.

7. The rotor as claimed in claim 6, characterized in that, The rotor core also includes rivet holes, which are arranged at intervals along the circumferential direction of the rotor core and are located radially between the flow hole and the magnetic pole slot group.

8. The rotor as claimed in claim 1, characterized in that, The rotor has p pole pairs, where 2 ≤ p ≤ 5.

9. The rotor as claimed in claim 1, characterized in that, The rotor core comprises multiple rotor laminations stacked along the axial direction of the rotor core.

10. The rotor as claimed in claim 1, characterized in that, The structure of the magnetic pole slot group is V-shaped or U-shaped.

11. A permanent magnet motor, characterized in that, Includes the rotor described in any one of claims 1 to 10.

12. A compressor, characterized in that, Includes the permanent magnet motor as described in claim 11.

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