Motor, compressor and household appliance

Abstract

The utility model discloses a motor, a compressor and a household appliance, the motor comprises a rotor assembly and a stator assembly, and the rotor assembly is arranged on the radial inner side of the stator assembly; the stator assembly comprises punching sheet units, the multiple punching sheet units are arranged in the circumferential direction in a surrounding mode to form stator punching sheets, each punching sheet unit comprises stator teeth and a stator yoke, the stator yokes of every two adjacent punching sheet units are connected in a deformable mode, and the stator teeth are arranged on the sides, facing the rotor assembly, of the stator yokes; the plurality of stator punching sheets are laminated in the axial direction to form a stator assembly; the tooth width of the stator teeth is W1, the yoke thickness of the stator yoke is H1, the axle distance between the adjacent stator teeth in the state that the plurality of punching sheet units are unfolded along a straight line is t, the minimum distance between the adjacent stator teeth in the state that the stator punching sheets are wound is b, and the minimum distance between the stator teeth and the rotor assembly is delta; wherein 14 < = K < = 22.

Description

Technical Field

[0001] This application relates to the field of electric motors, and more particularly to an electric motor, a compressor, and a household appliance. Background Technology

[0002] In related technologies, permanent magnet motors suffer from significant losses in practical applications, which in turn greatly reduces motor efficiency. Specifically, during operation, due to various factors, a large amount of magnetic field energy does not participate in effective electromechanical conversion, resulting in decreased efficiency. This can lead to various forms of losses, such as iron losses, copper losses, and mechanical losses. Magnetic field distortion caused by leakage flux results in uneven distribution of air gap magnetic flux density, making the motor prone to local magnetic saturation under load, weakening torque output stability, and limiting the motor's overload capacity. Therefore, improving the motor's overload capacity is the technical problem this application aims to solve. Utility Model Content

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of this application is to provide a motor that can improve the overload capacity of the motor.

[0004] An electric motor according to an embodiment of this application includes: a rotor assembly and a stator assembly, wherein the rotor assembly is disposed radially inside the stator assembly; wherein

[0005] The stator assembly includes:

[0006] A lamination unit, wherein a plurality of said lamination units are arranged circumferentially to form stator laminations, each said lamination unit includes stator teeth and stator yokes, the stator yokes of two adjacent said lamination units are deformably connected to each other, the stator teeth are disposed on the side of the stator yoke facing the rotor assembly, and the stator laminations are constructed in a plurality and are stacked axially to form the stator assembly;

[0007] The stator tooth width is W1, the stator yoke thickness is H1, the axial distance between adjacent stator teeth in the linear unfolded state of the multiple lamination units is t, the minimum distance between adjacent stator teeth in the stator lamination winding state is b, and the minimum distance between the stator teeth and the rotor assembly is δ; wherein

[0008]

[0009] And it satisfies 14≤K≤22.

[0010] According to an embodiment of this application, in a motor, W1H1 can represent the magnetic flux cross-sectional area at the junction of the stator teeth and the stator yoke, where the minimum distance between the stator teeth and the rotor assembly is δ, which is understood in the art as the air gap. t(5*δ+b) can reflect the equivalent length after the magnetic circuit is unfolded, including a weighted combination of the air gap δ and the tooth pitch b after wrapping, t(5δ+b)-b 2 It can be understood as the modified magnetic circuit length of the surrounding structure, reflecting the geometric constraint of the surrounding structure on the magnetic flux distribution. By constraining K, it is ensured that the magnetic circuit will not become oversaturated under high load, reducing the loss of the magnetic circuit and enabling the motor to operate more efficiently. The optimized magnetic circuit structure can maintain stable magnetic flux and electromagnetic force under overload conditions, enabling the motor to output greater torque, thereby improving the motor's overload capacity.

[0011] According to some embodiments of the motor in this application, the circumscribed circle diameter of the outer peripheral wall of the stator assembly is D1, the inscribed circle diameter of the inner peripheral wall of the stator assembly is D2, the circumscribed circle diameter of the outer peripheral wall of the rotor assembly is D3, and the inscribed circle diameter of the inner peripheral wall of the rotor core assembly is D4.

[0012]

[0013] And it satisfies 4≤K1≤7.

[0014] According to some embodiments of the motor of this application, the inner radial end of the stator teeth is formed with a toothed shoe portion, and the shortest distance L1 between the outer radial surface of the toothed shoe portion and the outer radial surface of the stator yoke portion is given, wherein the tooth width W1 of the stator teeth and the radial length L1 of the stator lamination satisfy the following:

[0015]

[0016] The motor according to some embodiments of this application further includes:

[0017] A permanent magnet is disposed on the rotor assembly, and the radial length of the permanent magnet is L. m The tooth width W1 of the stator tooth is equal to the radial length L of the permanent magnet. m satisfy:

[0018]

[0019] According to some embodiments of the present application, the rotor assembly of the motor includes:

[0020] The rotor lamination has multiple fan-shaped portions spaced apart in the circumferential direction. The multiple rotor laminations are stacked axially so that the fan-shaped portions facing each other in the thickness direction form a magnetic block. A magnetic groove is formed between two adjacent magnetic blocks, and the permanent magnet is housed in the magnetic groove.

[0021] The permanent magnet has a rectangular cross-section parallel to the rotor lamination.

[0022] According to some embodiments of the present application, the rotor laminations of the motor include a first rotor lamination and a second rotor lamination;

[0023] The minimum distance between the radial outer ends of two adjacent sector portions in the first rotor lamination is W. a The minimum distance between the radial inner ends of two adjacent sector portions in the first rotor lamination is W. b The minimum distance between the radial outer ends of two adjacent sector portions in the second rotor lamination is W. c The width of the permanent magnet is W m ;in

[0024]

[0025] And it satisfies: 0.95≤K2≤1.35, and

[0026] According to some embodiments of the motor in this application, in the first rotor lamination, in at least two adjacent sector-shaped portions in the circumferential direction, the radially outer ends of the two sector-shaped portions facing each other's sidewalls are respectively provided with protruding first external magnetic bridges, and the minimum straight-line distance between the ends of two adjacent first external magnetic bridges is W. a ;

[0027] In the second rotor lamination, in at least two adjacent sector portions in the circumferential direction, each sector portion has a second outer magnetic bridge protruding from its radially inner end facing each other's sidewalls. The minimum linear distance between the ends of two adjacent second outer magnetic bridges is W. c .

[0028] According to some embodiments of the present application, in the motor, the arc length of the first outer magnetic bridge in the circumferential direction is greater than the arc length of the second outer magnetic bridge in the circumferential direction, and the first rotor lamination is disposed on the outermost layer of the rotor core in the thickness direction.

[0029] According to some embodiments of the present application, in a motor, a plurality of second rotor laminations and a plurality of first rotor laminations are axially stacked to form the middle portion of the rotor core, or a plurality of second rotor laminations are axially stacked to form the middle portion of the rotor core.

[0030] At least one of the first rotor laminations is axially stacked on at least one side of the rotor core in the thickness direction at the middle portion.

[0031] According to some embodiments of the motor of this application, at least one of two adjacent sector portions in the circumferential direction of the first rotor lamination forms a first inner magnetic bridge. The first inner magnetic bridge is disposed at the radially inner end of the sector portion and protrudes circumferentially toward the adjacent sector portion. The minimum straight-line distance between the end of the first inner magnetic bridge and the sidewall of the adjacent sector portion is W. b .

[0032] According to some embodiments of the motor in this application, each of the sector portions on the first rotor lamination has a first inner magnetic bridge formed on the same side in the circumferential direction at its radially inner end, and the minimum distance between the first inner magnetic bridge and the circumferential sidewall of the adjacent sector portion is W. b .

[0033] The motor according to some embodiments of this application further includes: an inner rotor core, the inner rotor core having a mounting hole for connecting a rotating shaft, the inner rotor core being disposed at the center of the rotor assembly, and the outer peripheral wall of the inner rotor core being injection molded to the inner peripheral wall of the rotor core assembly.

[0034] According to some embodiments of the motor in this application, the circumscribed circle diameter of the outer peripheral wall of the rotor inner core is D5, and the inscribed circle diameter of the inner peripheral wall of the rotor inner core is D6, and satisfies:

[0035]

[0036] According to some embodiments of the motor in this application, the inner circle diameter D2 of the stator lamination inner peripheral wall and the outer circle diameter D5 of the rotor inner core outer peripheral wall satisfy the following:

[0037]

[0038] The compressor according to an embodiment of this application is briefly described below.

[0039] The compressor according to the embodiments of this application includes the motor described in any of the above embodiments. Since the compressor according to this embodiment is equipped with the motor described in any of the above embodiments, the motor on the compressor according to this application reduces magnetic circuit losses and avoids excessive magnetic circuit saturation by optimizing the stator assembly structural parameters, so that the motor can still operate efficiently under high load. Therefore, when the compressor encounters a sudden high load, the motor can also stably drive the compressor to operate, effectively reducing the problem of cooling or heating interruption caused by motor overload shutdown or unstable operation, improving the operating stability and reliability of the compressor under complex working conditions. By using a motor with high overload capacity, and because the magnetic circuit performance of the motor is optimized, the magnetic circuit loss is low under overload conditions, and the motor heats up relatively less, which reduces the possibility of damage to the motor windings and internal components of the compressor due to overheating, reduces the wear and aging rate of parts, thereby effectively extending the overall service life of the compressor and reducing the maintenance and replacement costs of the equipment.

[0040] The following is a brief description of household appliances according to embodiments of this application.

[0041] The household appliances according to the embodiments of this application include the compressor described in the above embodiments. Since the household appliances according to the embodiments of this application are equipped with the compressor described in the above embodiments, the operation of the household appliances according to the embodiments of this application is stable and reliable. When household appliances such as air conditioners and refrigerators are running in extreme environments or complex working conditions, the optimized stator component structure parameters of the compressor motor can effectively prevent motor overload shutdown. At the same time, the low loss and low heat generation characteristics brought about by the optimized magnetic circuit performance of the motor greatly reduce the aging and wear rate of internal components of the compressor. This will reduce problems such as winding failure caused by motor overheating and wear of internal mechanical parts of the compressor, and effectively extend the overall service life of the compressor. This not only reduces the economic cost of users frequently replacing equipment and reduces the pressure on the environment caused by the disposal of waste electrical appliances, but also reduces the maintenance cost during the life cycle of household appliances.

[0042] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0043] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0044] Figure 1 This is a schematic diagram of the structure of a motor according to an embodiment of this application;

[0045] Figure 2 This is a schematic diagram of the dimensions and structure of a motor according to an embodiment of this application;

[0046] Figure 3 This is a schematic diagram of the lamination unit in the motor according to an embodiment of this application, unfolded along a straight line.

[0047] Figure 4 This is a schematic diagram of the rotor assembly in the motor according to an embodiment of this application;

[0048] Figure 5 This is a schematic diagram of the structure of the first rotor lamination of the rotor assembly in the motor according to an embodiment of this application;

[0049] Figure 6 This is a schematic diagram of the structure of the second rotor lamination in the rotor assembly of the motor according to an embodiment of this application;

[0050] Figure 7 This is a schematic diagram of the structure of an electric motor with an inner iron core in the rotor according to an embodiment of this application;

[0051] Figure 8 This is a graph showing the per-unit efficiency value as a function of the K value;

[0052] Figure 9 This is a graph showing the per-unit value of back electromotive force as a function of the value of K;

[0053] Figure 10 This is a comparison chart of the per-unit current and per-unit torque values ​​between the traditional scheme and the present application;

[0054] Figure 11 This is a comparison chart of the per-unit demagnetizing current values ​​of the traditional scheme and the present application;

[0055] Figure 12 This is a comparison chart of the per-unit back potential values ​​of the traditional scheme and the present application;

[0056] Figure 13 This is a comparison chart of the per-unit electromagnetic cost of the traditional solution and the present application.

[0057] Figure label:

[0058] 100. Electric motor;

[0059] 1. Rotor assembly;

[0060] 11. Rotor laminations;

[0061] 111, First rotor lamination; 1111, First outer magnetic bridge; 1112, First inner magnetic bridge;

[0062] 112. Second rotor lamination; 1121. Second external magnetic bridge;

[0063] 12. Sector-shaped section; 13. Magnetic guide block; 14. Magnet slot;

[0064] 2. Stator assembly; 21. Lamination unit; 211. Stator tooth; 2111. Tooth shoe; 212. Stator yoke;

[0065] 3. Permanent magnet;

[0066] 4. Rotor inner core. Detailed Implementation

[0067] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0068] The following is for reference. Figures 1-13 A motor 100 according to an embodiment of this application is described.

[0069] An electric motor 100 according to an embodiment of this application includes: a rotor assembly 1 and a stator assembly 2, wherein the rotor assembly 1 is disposed radially inside the stator assembly 2; wherein

[0070] Stator assembly 2 includes:

[0071] Lamination unit 21, multiple lamination units 21 are arranged circumferentially to form stator laminations, each lamination unit 21 includes stator teeth 211 and stator yoke 212, the stator yokes 212 of two adjacent lamination units 21 are deformably connected to each other, the stator teeth 211 are provided on the side of the stator yoke 212 facing the rotor assembly 1, and the stator laminations are constructed in multiple and stacked axially to form stator assembly 2;

[0072] The stator tooth 211 has a tooth width of W1, the stator yoke 212 has a yoke thickness of H1, the axial distance between adjacent stator teeth 211 in the linear unfolded state of multiple lamination units 21 is t, the minimum distance between adjacent stator teeth 211 in the stator lamination winding state is b, and the minimum distance between stator teeth 211 and rotor assembly 1 is δ; whereby

[0073]

[0074] And it satisfies 14≤K≤22.

[0075] It should be noted that the overload capacity of the motor 100 depends on the maximum output torque of the motor 100. The maximum torque is limited by the region in the magnetic circuit that saturates first. When the magnetic flux density of the stator teeth 211 or the yoke exceeds the saturation point of its material, the permeability decreases, resulting in a nonlinear increase in magnetic reluctance. The magnetic flux cannot increase linearly with the current, thus limiting the torque increase.

[0076] It is understandable that W1*H1 represents the flux-carrying cross-sectional area of ​​the stator teeth 211 and the yoke, and the wheelbase t is the distance between adjacent stator teeth 211 when multiple lamination units 21 are deployed in a straight line, which affects the distribution density of stator teeth 211. Changes in the value of t alter the magnetic reluctance distribution of the magnetic circuit; a smaller t means that the stator teeth 211 are more densely distributed, which can enhance the magnetic field strength to some extent, but may also increase the risk of magnetic circuit saturation. The minimum distance b between adjacent stator teeth 211 in the stator lamination winding state directly affects the magnetic reluctance of the magnetic circuit; the smaller the value of b, the relatively larger the magnetic reluctance in that region, hindering the smooth passage of magnetic flux. However, in the formula, b works in conjunction with other parameters; a reasonable b value combined with other parameters can optimize the overall performance of the magnetic circuit. The air gap length δ between the stator teeth 211 and the rotor assembly 1 is the part with the larger magnetic reluctance in the magnetic circuit of the motor 100. An increase in air gap length significantly increases magnetic reluctance, requiring a larger excitation current to maintain the magnetic flux. However, in the formula, δ is combined with other parameters, and when a certain relationship is satisfied, the performance of motor 100 can be optimized while ensuring reasonable magnetic resistance of the magnetic circuit.

[0077] t*(5*δ+b) represents the equivalent length of the magnetic circuit in the linear unfolded state, where 5*δ is the weighted amplification effect of the air gap on the magnetic circuit, and t*(5δ+b)-b 2 To correct the length of the magnetic circuit under the ring, when the lamination unit 21 is unfolded from a straight line to a ring, the geometric deformation causes the leakage magnetic path to shorten, and the axial distance t between the original adjacent stator teeth 211 is shortened. Therefore, it is necessary to correct the length of the magnetic circuit under the ring.

[0078] Among them, (t*(5*δ+b)) / (t*(5δ+b)-b 2 This can be understood as a formula for the variation of the Cartesian coefficient, with the same purpose as the Cartesian coefficient: to correct the effect of the 100-slot opening of the motor on the air gap reluctance. This is achieved through the formula (t*(5*δ+b)) / (t*(5δ+b)-b). 2 This can effectively increase the length of the air gap, thereby increasing the magnetic reluctance. However, since the values ​​of t, δ, and b are relatively small, and (t*(5*δ+b)) / (t*(5δ+b)-b) 2 The ratio of H1 to W1 is usually approximately equal to 1, so the subsequent analysis mainly focuses on H1 and W1. Furthermore, K is the ratio of the magnetic circuit cross-sectional area to the modified magnetic circuit length, reflecting the balance between permeability and reluctance. The constraint 14≤K≤22 is to ensure that the magnetic flux density is below the saturation threshold under overload conditions, while also avoiding material redundancy.

[0079] Increasing the tooth width W1 can reduce the magnetic density of the tooth section and delay its saturation, but it requires balancing the stator slot area, as the slot area affects winding copper losses. Increasing H1 can reduce the magnetic density of the stator yoke 212. In the K-value formula, the product of H1 and W1 dominates the numerator, indicating that the tooth and yoke cross-sectional areas need to be optimized simultaneously. When K is less than 14, it indicates that the magnetic flux carrying cross-sectional area of ​​the stator tooth 211 and yoke is insufficient, causing the tooth or yoke to saturate prematurely under high magnetomotive force, limiting magnetic flux growth. When K is greater than or equal to 22, the magnetic circuit cross-sectional area is excessively redundant, leading to slot space encroachment and further increasing winding copper losses, thus reducing power density. When 14 ≤ K ≤ 22, the cross-sectional area and magnetic circuit length are balanced, ensuring that the magnetic flux density is evenly distributed and below the saturation point under overload. The optimized magnetic circuit structure reduces magnetic circuit losses, enabling the motor 100 to operate more efficiently. Under overload conditions, it maintains stable magnetic flux and electromagnetic force, allowing the motor 100 to output greater torque, thus improving its overload capacity. Understandably, under overload conditions, the motor 100 requires greater electromagnetic force to overcome load resistance. Due to the optimized magnetic circuit performance, under the same current input, the motor 100 can generate a stronger magnetic field, resulting in greater electromagnetic force and torque. Simultaneously, the lower magnetic circuit losses ensure that the motor 100 will not rapidly degrade in performance or be damaged due to overheating under overload conditions, allowing it to withstand operating conditions exceeding its rated load for a short period, thereby enhancing its overload capacity.

[0080] In short, by constraining K, the magnetic circuit is prevented from becoming oversaturated under high load, reducing magnetic circuit losses and enabling the motor 100 to operate more efficiently. The optimized magnetic circuit structure can maintain stable magnetic flux and electromagnetic force under overload conditions, allowing the motor 100 to output greater torque, thereby improving the overload capacity of the motor 100.

[0081] According to some embodiments of the motor 100 of this application, the circumscribed circle diameter of the outer peripheral wall of the stator assembly 2 is D1, the inscribed circle diameter of the inner peripheral wall of the stator assembly 2 is D2, the circumscribed circle diameter of the outer peripheral wall of the rotor assembly 1 is D3, and the inscribed circle diameter of the inner peripheral wall of the rotor core assembly is D4.

[0082]

[0083] And it satisfies 4≤K1≤7.

[0084] Understandably, the outer circumscribed circle diameter D1 and the inner circumscribed circle diameter D2 of the stator assembly 2 determine its overall size and internal spatial structure. Similarly, D3 and D4 determine the overall size and internal spatial structure of the rotor assembly 1. The formula for K1 approximates the ratio of the cross-sectional area of ​​the stator assembly 2 to that of the rotor assembly 1. When K1 < 4, it indicates that the cross-sectional area of ​​the stator assembly 2 is too small relative to the rotor assembly 1, leading to a limited number of stator winding turns, insufficient magnetomotive force, and a weak magnetic field strength generated by the motor 100. Under the same current, the electromagnetic torque output by the motor 100 is small, making it difficult to meet the power requirements under overload conditions. Simultaneously, the smaller stator cross-sectional area results in relatively high magnetic reluctance in the magnetic circuit, hindering magnetic flux transmission, increasing hysteresis and eddy current losses, and causing severe heat generation during motor 100 operation. Prolonged operation under overload conditions can easily lead to performance degradation and even malfunction of the motor 100 due to overheating, severely reducing its overload capacity and service life. When K1>7, it indicates that the cross-sectional area of ​​stator assembly 2 is too large relative to rotor assembly 1. Although a larger stator cross-sectional area can accommodate more windings and increase magnetomotive force, rotor assembly 1 is relatively small and cannot generate good electromagnetic coupling with the stator. In this case, the magnetic field distribution of motor 100 is uneven, and some magnetic flux cannot effectively participate in energy conversion, resulting in a decrease in the operating efficiency of motor 100. Moreover, an excessively large stator size may increase the weight and cost of motor 100, and also affect the heat dissipation performance of motor 100. Under overload conditions, motor 100 will not only have difficulty outputting sufficient torque, but may also overheat due to poor heat dissipation, thus failing to improve overload capacity, and may even damage motor 100 due to overheating.

[0085] When K1 is in the range of 4 ≤ K1 ≤ 7, it means that the cross-sectional areas of stator assembly 2 and rotor assembly 1 are in a reasonable ratio. A relatively large stator cross-sectional area can accommodate more winding turns, thereby increasing the magnetomotive force. More winding turns, combined with a reasonable rotor cross-sectional area, allow for smoother transmission of magnetic flux between the stator and rotor during motor 100 operation, reducing magnetic reluctance. Lower magnetic reluctance reduces hysteresis and eddy current losses, lowering the heat generated by motor 100 during operation. Under overload conditions, the heat generation of motor 100 is effectively controlled, preventing performance degradation and insulation aging caused by overheating, ensuring continuous and stable operation of motor 100, and providing a foundation for improved overload capacity.

[0086] According to some embodiments of the present application, the motor 100 has a toothed shoe portion 2111 formed at the radial inner end of the stator tooth 211 portion. The shortest distance L1 between the radial outer surface of the toothed shoe portion 2111 and the radial outer surface of the stator yoke 212 portion is such that the tooth width W1 of the stator tooth 211 and the radial length L1 of the stator lamination satisfy the following:

[0087]

[0088] Understandably, L1, as the shortest distance between the radial outer surface of the toothed shoe portion 2111 and the radial outer surface of the stator yoke 212, determines the radial extension of the stator teeth 211. When L1 / W1 < 0.3, it means that the width W1 of the stator teeth 211 is too small relative to the shortest distance L1. In this case, the magnetic field area of ​​the stator teeth 211 is insufficient, and the magnetic flux density of the stator teeth 211 will increase significantly under the same magnetic flux. When the motor 100 is overloaded, the magnetic flux increases, and the excessively high magnetic flux density will cause the stator teeth 211 and the toothed shoe portion 2111 region to saturate rapidly, the permeability will drop sharply, and the magnetic reluctance of the magnetic circuit will increase significantly. Magnetic circuit saturation and increased magnetic reluctance make it difficult for the magnetic flux to pass smoothly, the magnetic field strength generated by the motor 100 will weaken, and the electromagnetic torque will decrease accordingly. When L1 / W1 > 0.4, it indicates that the width W1 of the stator teeth 211 is too large relative to the shortest distance L1. While excessively wide stator teeth 211 can reduce their own magnetic flux density, they will cause stator teeth 211 to occupy too much space in the radial direction, resulting in insufficient L1 length. This will disrupt the distribution of magnetic flux between stator teeth 211, tooth shoe 2111 and stator yoke 212, causing an unreasonable magnetic circuit path and exacerbating magnetic leakage, which will affect the efficiency of motor 100.

[0089] when At the same time, by optimizing the magnetic circuit saturation characteristics, reducing leakage flux, and improving winding arrangement and heat dissipation, the overload capacity of motor 100 can be effectively improved.

[0090] The motor 100 according to some embodiments of this application further includes:

[0091] Permanent magnet 3 is disposed on rotor assembly 1, and the radial length of permanent magnet 3 is L. m The tooth width W1 of stator tooth 211 is equal to the radial length L of permanent magnet 3. m Satisfies: 0.3 ≤ W1 / Lm ≤ 0.4

[0092]

[0093] Permanent magnet 3 is disposed on rotor assembly 1, and its radial length L m This determines the magnetic field strength and effective range generated by permanent magnet 3. m The larger the magnet is, the stronger the magnetomotive force generated by the permanent magnet 3, which can provide more magnetic field energy for the operation of the motor 100.

[0094] When L m When / W1 < 0.3, the stator tooth width W1 relative to the radial length L of the permanent magnet 3 is... mIf the area is too small, the magnetic field area of ​​the stator teeth 211 will be insufficient, making it impossible to fully utilize the magnetic field generated by the permanent magnet 3. When the motor 100 is overloaded, the magnetic flux increases, and the magnetic flux density of the stator teeth 211 will rise rapidly, easily leading to magnetic saturation. Magnetic saturation will cause a sharp drop in permeability and a significant increase in magnetic circuit reluctance, resulting in a weakening of the magnetic field strength and a reduction in electromagnetic torque. At the same time, magnetic saturation will also cause severe hysteresis loss and eddy current loss, exacerbating the heating of the motor 100. The motor 100 will not only be unable to output sufficient torque to overcome the overload, but may also be damaged due to overheating, severely reducing the overload capacity and service life of the motor 100.

[0095] When L m When / W1>0.4, the stator tooth width W1 relative to the radial length L of the permanent magnet 3 is... m Excessive width of the stator teeth 211 can lead to uneven magnetic reluctance distribution in the magnetic circuit, disrupting the magnetic field coupling balance between the stator and rotor. In this case, although the magnetic flux density of the stator teeth 211 is low, the magnetic field generated by the permanent magnet 3 cannot effectively interact with the stator teeth 211, and some magnetic flux cannot participate in electromagnetic conversion, exacerbating magnetic leakage. Significant magnetic leakage reduces the effective magnetic flux participating in electromagnetic conversion, drastically decreasing the electromagnetic conversion efficiency of the motor 100. Under overload conditions, the motor 100 struggles to generate sufficient electromagnetic force and torque to cope with the increased load. Furthermore, excessively wide stator teeth 211 occupy too much space, potentially affecting winding arrangement and heat dissipation, further reducing the performance and reliability of the motor 100 and weakening its overload capacity.

[0096] and At that time, the width W1 of stator tooth 211 and the radial length L of permanent magnet 3 m Achieving a reasonable ratio optimizes the magnetic field coupling between the stator teeth 211 and the permanent magnet 3. At this point, the magnetic field generated by the permanent magnet 3 can efficiently pass through the stator teeth 211, forming a stable and uniform magnetic circuit. Under overload conditions of the motor 100, the increased load leads to a greater demand for magnetic flux. This ensures that the magnetic circuit does not experience local saturation or sudden changes in magnetic reluctance under high magnetic flux, maintaining the balance of the magnetic circuit. A stable magnetic circuit ensures that the motor 100 continuously outputs sufficient electromagnetic torque, effectively overcoming overload resistance and thus improving the overload capacity of the motor 100.

[0097] According to some embodiments of the present application, the rotor assembly 1 of the motor 100 includes:

[0098] The rotor lamination has multiple fan-shaped portions 12 spaced apart in the circumferential direction. The multiple rotor laminations are stacked axially so that the fan-shaped portions 12 facing each other in the thickness direction form a magnetic block 13. A magnetic groove 14 is formed between two adjacent magnetic blocks 13, and a permanent magnet 3 is housed in the magnetic groove 14. The permanent magnet 3 has a rectangular cross section parallel to the rotor lamination.

[0099] Multiple circumferentially spaced fan-shaped portions 12 are axially stacked to form magnetically conductive blocks 13. These blocks concentrate and guide the magnetic field generated by the permanent magnets 3, resulting in a more uniform and orderly distribution of the magnetic field within the rotor. During motor 100 operation, this uniform magnetic field distribution helps improve the stability of electromagnetic conversion and reduces energy loss caused by magnetic field disturbances. Simultaneously, the design of the magnetically conductive blocks 13 enhances the rotor's magnetic permeability, enabling better interaction between the rotor and the stator magnetic field, ensuring stable torque output from the motor 100. The magnetic slots 14 between adjacent magnetically conductive blocks 13 provide mounting positions for the permanent magnets 3.

[0100] The shape of the rectangular permanent magnet 3 determines the regularity and stability of the magnetic field distribution. Due to the symmetry of the rectangle, the magnetic field generated by the permanent magnet 3 is relatively uniformly distributed around it. During the operation of the motor 100, the stable and uniform magnetic field distribution helps maintain the stability of the magnetic circuit. When the rotor rotates, the magnetic field generated by the rectangular permanent magnet 3 interacts with the stator windings, driving the rotor to rotate. The uniform magnetic field distribution makes the electromagnetic force on the rotor more balanced during rotation, avoiding the unbalanced force on the rotor caused by uneven magnetic field distribution. At the same time, since the cross-section of the permanent magnet 3 parallel to the rotor lamination is rectangular, it is not necessary to round the edges of the permanent magnet 3 perpendicular to the rotor lamination, simplifying the production process.

[0101] According to some embodiments of the present application, the motor 100 has rotor laminations including a first rotor lamination 111 and a second rotor lamination 112;

[0102] The minimum distance between the radial outer ends of two adjacent sector portions 12 in the first rotor lamination 111 is W. a The minimum distance between the radial inner ends of two adjacent sector portions 12 in the first rotor lamination 111 is W. b The minimum distance between the radial outer ends of two adjacent sector portions 12 in the second rotor lamination 112 is W. c The width of permanent magnet 3 is W. m ;in

[0103]

[0104] And it satisfies: 0.95≤K2≤1.35, and

[0105] It should be noted that leakage flux refers to the phenomenon where the magnetic flux generated by the permanent magnet 3 does not pass through the air gap to do work, but forms a closed path inside the rotor. Specifically, in this structure, the leakage flux path is from the N pole of the permanent magnet 3 to an adjacent magnetic block 13, to the back of the rotor core, to another adjacent magnetic block 13, and back to the S pole of the permanent magnet 3. The magnitude of the leakage flux is determined by the ratio of the magnetic reluctance of the leakage flux path to that of the main magnetic path. Here, the main magnetic path refers to the effective magnetic flux passing through the air gap, and the magnetic reluctance R represents the resistance of the magnetic circuit to the magnetic flux. According to the magnetic reluctance formula... L represents the magnetic path length, μ is the permeability of the material, and A is the cross-sectional area of ​​the magnetic path. It can be seen that the magnetic reluctance is directly proportional to the path length L and inversely proportional to the cross-sectional area A.

[0106] W a The distance between the outer ends of the first lamination can control the opening width of the magnet slot 14, affecting the cross-sectional area of ​​the leakage magnetic path, W b The spacing between the inner ends of the first lamination determines the width of the root of magnet slot 14, which affects the magnetic reluctance of the initial segment of the leakage magnetic path, W. c The distance between the outer ends of the first lamination is equal to W. a The difference represents the distance difference between the slot openings of the magnet slot 14 formed by the outer ends of the first and second laminations, which can extend the leakage magnetic path length. m / L m The aspect ratio of permanent magnet 3 is given by the magnet's shape, which affects the ratio of main magnetic flux to edge magnetic flux.

[0107] W m / L m The main limitation is the effect of magnet width on edge magnetic flux, when W m / L m A value <0.3 indicates that the magnet is too narrow, and the main magnetic flux is concentrated in the center. At this point, the cross-sectional area of ​​the main magnetic circuit decreases, leading to an increase in the magnetic reluctance of the main magnetic circuit. This forces the magnetic flux to preferentially pass through the low-resistance center path. The magnetic field lines at the magnet's edge are difficult to effectively constrain due to insufficient width, and diffuse outwards to form edge magnetic flux. These fluxes do not pass through the air gap to do work, but instead form leakage magnetic paths through adjacent magnetically conductive blocks 13. Since the cross-sectional area of ​​the leakage magnetic path remains unchanged while the cross-sectional area of ​​the main magnetic circuit decreases, the leakage magnetic ratio increases, leading to an increase in leakage magnetic flux. When W... m / L m When W > 0.5, it indicates that the magnet is too wide, the magnetic field is more widely distributed in the width direction, and the magnetic flux diffusion range in the edge region is significantly increased. These diffused magnetic field lines form low magnetic reluctance paths on both sides of the magnet, bypassing the air gap and closing directly through the rotor core, resulting in an increase in the cross-sectional area of ​​the leakage magnetic path. The magnetic reluctance of the leakage magnetic path decreases with the increase of the cross-sectional area. According to the magnetic flux division law, more magnetic flux chooses the leakage magnetic path instead of the effective air gap path, causing leakage, reducing the utilization rate of the main magnetic flux, wasting permanent magnet material, and the wide magnet may increase the rotor weight and inertia, affecting the dynamic response; when 0.3 ≤ W m / L mWhen the width-to-length ratio is ≤0.5, the appropriate width-to-length ratio allows the magnetic flux to be evenly distributed in the air gap, and the cross-sectional area of ​​the main magnetic circuit and the magnetic reluctance of the leakage magnetic path reach the optimal balance, maximizing the effective magnetic flux ratio. By constraining the size of the magnet, the excessive diffusion of the edge magnetic field is limited, the leakage magnetic cross-sectional area is reduced, and local magnetic saturation caused by the magnet being too narrow is avoided.

[0108] (W c -W a ) / (W m -W b In ), molecule W c -W a This represents the distance difference between the openings of the magnet slots 14 formed by the outer ends of the first and second laminations, when W c -W a When W is positive, it can lengthen the leakage magnetic path. As W increases, the leakage magnetic path needs to bypass a longer conical region, and the magnetic reluctance increases. This can be understood as W increasing the leakage magnetic path length. c =W a The leakage flux passes through the slot opening in a straight line, resulting in a shorter path. However, when W... c >W a The leakage flux travels an extra distance around the difference, lengthening the path, so when W c -W a As the value increases, the leakage flux path lengthens, the magnetic reluctance of the leakage flux path increases, and therefore the leakage flux decreases; the denominator W m -W b The value reflected in W is the difference between the opening at the root of magnet slot 14 and the width of the magnet. m -W b When the value is reduced, the cross-sectional area of ​​the leakage magnetic path decreases, while the magnetic resistance of the leakage magnetic path increases, which helps to reduce leakage magnetic field.

[0109] Furthermore, when K2 < 0.95, it means W c -W a or W m -W b If the value is too large, the magnetic reluctance of the leakage magnetic path will be insufficient, and the magnetic flux will flow along the leakage magnetic path, causing leakage in the main magnetic path. Alternatively, if the magnet is too narrow, the cross-sectional area of ​​the main magnetic path will decrease, leading to an increase in the magnetic reluctance of the main magnetic path. Physically, a large cross-sectional area and a short length of the leakage magnetic path result in a decrease in leakage magnetic reluctance, an increase in the magnetic flux flowing through the leakage magnetic path, and an increase in leakage. When K2 > 1.35, it means that W c Possibly much larger than W aThe slot of the second rotor lamination 112 is much larger than the slot of the first rotor lamination 111. The cross-sectional area of ​​the main magnetic circuit is reduced, which leads to an increase in the magnetic reluctance of the main magnetic circuit or severe diffusion of the edge magnetic flux due to the magnet being too wide. Physically, this manifests as an increase in the magnetic reluctance of the main magnetic circuit, a decrease in the effective magnetic flux, and a reduction in efficiency. However, when 0.95≤K2≤1.35, the matching of the magnet shape and slot parameters maximizes the ratio of the magnetic reluctance of the leakage magnetic path to the magnetic reluctance of the main magnetic path, thus achieving a smaller amount of leakage magnetic flux.

[0110] Furthermore, due to the reduction in leakage flux, the utilization rate of the main magnetic flux is improved, the torque output is higher under the same current, the magnetic force is more uniform, the core saturation is delayed, a larger current injection is allowed without demagnetization, the copper loss per unit torque is reduced, and the overload duration is extended. Within the K2 value constraint range, the rotor core assembly not only improves efficiency, but also significantly enhances the overload capacity of motor 100 through magnetic circuit anti-saturation design and magnetic flux distribution optimization.

[0111] In short, the leakage magnetic path is extended by the change in the spacing of the magnet slot 14 at the radial outer end, and the difference between the opening of the magnet slot 14 at the radial inner end and the width of the magnet slot 14 limits the leakage magnetic cross-sectional area. The aspect ratio of the permanent magnet 3 suppresses edge diffusion, concentrates effective magnetic flux, reduces leakage magnetic field and loss, and achieves higher torque density and lower temperature rise. Under the constraint of K2 value, the geometric parameters of the rotor core assembly work together to significantly reduce leakage magnetic field and improve the efficiency of the motor 100%.

[0112] According to some embodiments of the motor 100 of this application, in the first rotor lamination 111, in at least two adjacent sector portions 12 in the circumferential direction, the radially outer ends of the two sector portions 12 facing each other's sidewalls are respectively provided with protruding first outer magnetic bridges 1111, and the minimum straight-line distance between the ends of two adjacent first outer magnetic bridges 1111 is W. a ;

[0113] In the second rotor lamination 112, in at least two adjacent sector portions 12 in the circumferential direction, each sector portion 12 has a second outer magnetic bridge 1121 protruding from its radial inner end facing each other's sidewalls. The minimum straight-line distance between the ends of two adjacent second outer magnetic bridges 1121 is W. c .

[0114] Understandably, when magnetic flux attempts to pass through the gap between adjacent sector portions 12 of the first rotor lamination 111, the channel formed between the first outer magnetic bridges 1111 forces a significant change in the magnetic flux path. Because the first outer magnetic bridges 1111 protrude outwards, the cross-sectional area of ​​the magnetic flux path decreases, increasing the magnetic reluctance. Due to the higher reluctance, magnetic lines of force cannot easily pass through the magnetic bridge region, and are thus forced to propagate along the main magnetic circuit direction formed by the magnet slot 14 and the magnetic guide block 13. In this way, magnetic lines of force that might otherwise diffuse radially outwards are effectively confined, reducing magnetic leakage at the radially outwards end. The second outer magnetic bridge 1121 in the second rotor lamination 112 is located at the radially inner end of the sidewalls of adjacent sector portions 12 facing each other. Similar to the first outer magnetic bridge 1111, the second outer magnetic bridge 1121 also has characteristics that can improve the magnetic reluctance of the leakage path.

[0115] According to some embodiments of the present application, the motor 100 has a first outer magnetic bridge 1111 with an arc length in the circumferential direction that is greater than the arc length of the second outer magnetic bridge 1121 in the circumferential direction, and the rotor core is provided with a first rotor lamination 111 on the outermost layer in the thickness direction.

[0116] Furthermore, the circumferential arc length of the first outer magnetic bridge 1111 is greater than that of the second outer magnetic bridge 1121. Due to the length difference between the first and second outer magnetic bridges 1111 and 1121, the length of the leakage magnetic path increases, leading to an increase in the magnetic reluctance of the leakage magnetic path and a reduction in leakage magnetic flux. The magnetic lines of force, due to the longer length of the first outer magnetic bridge 1111 and the shorter length of the second outer magnetic bridge 1121, tend to be transmitted along the center of the magnet slot 14 to the guide magnet block 13, reducing diffusion to the edges of the magnet slot 14 and the radial inner and outer ends of the non-main magnetic circuit region, thus reducing the possibility of leakage magnetic flux. Simultaneously, because the rotor core has a first rotor lamination 111 on its outermost layer in the thickness direction, and the first rotor lamination 111 has a relatively long arc length of the first outer magnetic bridge 1111, the entire rotor core forms a larger magnetic reluctance on its outermost layer compared to the second outer lamination. When the motor 100 is running, the outermost layer is in direct contact with the external environment, making it prone to magnetic field leakage. The first outer magnetic bridge 1111 of the first rotor lamination 111 has a relatively long arc length, which can effectively block the outward divergence of magnetic lines of force in the outermost layer of the rotor core, further enhancing the suppression of leakage flux. Moreover, the outer first magnetic bridge 1111 can also guide and protect the internal magnetic circuit, ensuring that the magnetic lines of force in the internal magnetic circuit are transmitted along the main magnetic circuit direction, reducing interference from leakage magnetic field in the outer layer, thereby ensuring the stability and effectiveness of the magnetic circuit. It should be noted that the permanent magnet 3 can be limited by the first outer magnetic bridge 1111 and the second outer magnetic bridge 1121.

[0117] According to some embodiments of the present application, a plurality of second rotor laminations 112 and a plurality of first rotor laminations 111 are axially stacked to form the middle portion of a rotor core, or a plurality of second rotor laminations 112 are axially stacked to form the middle portion of a rotor core; at least one first rotor lamination 111 is axially stacked on at least one side of the middle portion of the rotor core in the thickness direction.

[0118] When multiple second rotor laminations 112 and multiple first rotor laminations 111 are axially stacked to form the middle part of the rotor core, or when multiple second rotor laminations 112 are axially stacked to form the middle part of the rotor core, both methods determine the basic magnetic circuit structure in the middle part of the rotor core. The second outer magnetic bridge 1121 on the second rotor laminations 112 and the first outer magnetic bridge 1111 on the first rotor laminations 111 cooperate with each other during the stacking process to form a magnetic circuit channel with a specific magnetic resistance distribution. The second outer magnetic bridge 1121 plays a certain role in hindering the magnetic lines of force at its radial outer end, while the first outer magnetic bridge 1111, with its longer arc length at its radial outer end, can more effectively constrain the magnetic lines of force. The combined effect of the two makes the magnetic field in the middle part of the rotor core more inclined to be transmitted along the main magnetic circuit, reducing the disordered diffusion of magnetic lines of force in the middle region and building a relatively stable magnetic circuit foundation.

[0119] At least one first rotor lamination 111 is axially stacked on at least one side of the rotor core in the thickness direction. This arrangement further strengthens the magnetic circuit structure of the entire rotor core. During the operation of the motor 100, the outermost layer is in direct contact with the external environment and is prone to magnetic field leakage. However, the first outer magnetic bridge 1111, with its long arc length advantage, can effectively block the outward divergence of magnetic lines of force on both sides of the rotor core, prevent the external environment from interfering with the internal magnetic circuit, and ensure that the magnetic lines of force in the internal magnetic circuit are transmitted along the predetermined main magnetic circuit direction, thereby strengthening the integrity and stability of the entire rotor core magnetic circuit.

[0120] According to some embodiments of the motor 100 of this application, at least one of two adjacent sector portions 12 in the circumferential direction of the first rotor lamination 111 is formed with a first inner magnetic bridge 1112. The first inner magnetic bridge 1112 is disposed at the radial inner end of the sector portion 12 and protrudes circumferentially toward the adjacent sector portion 12. The minimum straight-line distance between the end of the first inner magnetic bridge 1112 and the sidewall of the adjacent sector portion 12 is W. b .

[0121] In the first rotor lamination 111, at least one of two adjacent sector portions 12 in the circumferential direction forms a first inner magnetic bridge 1112, which is located at the radial inner end of the sector portion 12 and protrudes towards the adjacent sector portion 12. When the magnetic field generated by the permanent magnet 3 diffuses within the rotor core, the magnetic lines of force encounter the first inner magnetic bridge 1112. Because the arrangement of the first inner magnetic bridge 1112 reduces the cross-sectional area of ​​the leakage magnetic path, the magnetic flux is obstructed on the leakage magnetic path. Specifically, the magnetic lines of force follow the principle of the path of least magnetic reluctance during transmission. When encountering the first inner magnetic bridge 1112, in order to find a path with lower magnetic reluctance, they will transmit more along the main magnetic path direction. The width W of the permanent magnet 3... m The minimum straight-line distance W between the end of the first inner magnetic bridge 1112 and the sidewall of the adjacent sector 1211 b The difference in magnetic reluctance is felt when W m -W b When the value is reduced, the cross-sectional area of ​​the leakage magnetic path decreases, while the magnetic resistance of the leakage magnetic path increases, which helps to reduce leakage magnetic field.

[0122] According to some embodiments of the motor 100 of this application, each sector 12 on the first rotor lamination 111 has a first inner magnetic bridge 1112 formed on the same side in the circumferential direction at its radially inner end. The minimum distance between the first inner magnetic bridge 1112 and the circumferential sidewall of the adjacent sector 12 is W. b .

[0123] The first inner magnetic bridge 1112, located on the same side, significantly reduces magnetic leakage by directionally restricting the path of magnetic field lines. This is because, during motor 100 operation, magnetic field lines may freely diffuse in various directions at the radial inner end, resulting in substantial loss of magnetic field energy. However, the first inner magnetic bridge 1112 on the same side only allows a small number of magnetic field lines to pass through the high magnetic resistance region; most magnetic field lines are forced to travel along the main magnetic path formed by the magnet slot 14 and the magnetic guide block 13. When the magnetic field generated by the permanent magnet 3 diffuses radially inward, the first inner magnetic bridge 1112 on the same side almost completely blocks the magnetic field lines leaking in that direction, forcing them to change direction within the magnet slot 14 and replan their path. Compared to bridges not located on the same side, this directional restriction significantly reduces magnetic leakage from the radial inner end, substantially improving the utilization rate of magnetic field energy.

[0124] According to some embodiments of this application, the motor 100 further includes: an inner rotor core 4, the inner rotor core 4 having a mounting hole for connecting a rotating shaft, the inner rotor core 4 being disposed at the center of the rotor assembly 1, and the outer peripheral wall of the inner rotor core 4 being injection molded to the inner peripheral wall of the rotor core assembly.

[0125] The mounting holes in the rotor inner core 4 for connecting the rotating shaft are the basic structure for power transmission of the motor 100. The mounting holes provide a positioning connection point for the rotating shaft. The outer peripheral wall of the rotor inner core 4 and the inner peripheral wall of the rotor core assembly are connected by injection molding. During the injection molding process, the plastic material fills the gap between the outer peripheral wall of the rotor inner core 4 and the inner peripheral wall of the rotor core assembly, forming a tight bond. On the one hand, this fixes the rotor inner core 4 to the rotor assembly 1, enhancing the structural strength and rigidity of the entire rotor core assembly. When the motor 100 rotates at high speed, the rotor assembly 1 is subjected to mechanical forces such as centrifugal force. The injection molding connection effectively resists external forces, preventing displacement or loosening of the magnetic guide block 13. In high-power motors 100, the rotor rotates at high speed and experiences large centrifugal force. The injection molding connection ensures that the magnetic guide block 13 and the rotor inner core 4 always maintain a stable relative position, avoiding vibration and noise caused by structural looseness and improving the smoothness of motor 100 operation. On the other hand, the injection molding connection also acts as a buffer. When the motor 100 starts, stops, or the load changes, the rotor will be subjected to impact and vibration. The elasticity of the injection molding layer can absorb some of the impact force, reduce the stress concentration between the magnetic block 13 and the rotor core 4, reduce the risk of component damage caused by mechanical stress, and extend the service life of the rotor core assembly.

[0126] In some embodiments of this application, a plurality of injection molding receiving grooves extending in the thickness direction are formed on the outer periphery of the rotor inner core 4. During the injection molding process, molten plastic material can fill these receiving grooves. After cooling and solidification, a more robust connection structure is formed between the plastic and the rotor inner core 4 and the magnetic block 13.

[0127] From a mechanical connection perspective, the injection-molded receiving groove increases the contact area between the plastic and the rotor's inner iron core 4. The structure with the receiving groove allows the plastic to be embedded within it, greatly enhancing the bonding force between the two. This bonding force is not only manifested in the axial direction, but also effectively restricts the relative displacement between the magnetic guide block 13 and the rotor's inner iron core 4 in the circumferential and radial directions. When the motor 100 rotates at high speed, centrifugal force will generate an outward pulling force on the rotor iron core assembly, while the plastic part in the injection-molded receiving groove can tightly hold the magnetic guide block 13, preventing it from loosening due to centrifugal force, and ensuring the integrity and stability of the entire component structure.

[0128] It should be noted that the injection-molded receiving groove on the outer periphery of the rotor inner core 4 is constructed as a dovetail tooth structure that narrows or widens radially outward, or is circular, elliptical, polygonal, elongated, or irregular in shape.

[0129] It should be noted that the rotating shaft on rotor assembly 1 is connected to the inner rotor core 4 in the rotor core. During the process of disassembling the rotor core assembly, only the inner rotor core 4 and the rotating shaft can be removed, while the rest of rotor assembly 1 can be completely removed, thus realizing the modular utilization of the rotor core assembly.

[0130] According to some embodiments of the present application, the diameter of the circumscribed circle of the outer peripheral wall of the rotor inner core 4 is D5, and the diameter of the inscribed circle of the inner peripheral wall of the rotor inner core 4 is D6, and satisfies:

[0131]

[0132] Understandably, when D5 / D6 < 2, the rotor needs to transmit a larger torque when the motor 100 is overloaded. The thin inner iron core 4 of the rotor cannot withstand the high-intensity mechanical stress and is prone to deformation or even breakage. For example, when the motor 100 of the industrial compressor is running under overload, the inner iron core 4 of the rotor may become loose due to insufficient mechanical strength, causing the motor 100 to fail to operate normally. This seriously affects the reliability and service life of the motor 100 and greatly reduces the overload capacity of the motor 100.

[0133] When D5 / D6 > 2.5, it indicates that the outer diameter D5 of the rotor inner core 4 is too large relative to the inner diameter D6, meaning the wall thickness of the rotor inner core 4 is too thick. An excessively thick rotor inner core 4 increases the overall weight of the rotor, leading to increased mechanical losses during motor 100 operation. Under overload conditions, motor 100 needs to consume more energy to drive the heavier rotor, reducing its efficiency. Simultaneously, the greater weight also puts greater pressure on components such as bearings, accelerating wear and shortening the service life of motor 100, which is detrimental to its long-term stable operation under overload conditions. When 2 ≤ D5 / D6 ≤ 2.5, the overload capacity of motor 100 can be effectively improved while maintaining mechanical strength.

[0134] According to some embodiments of the motor 100 of this application, the inner circle diameter D2 of the stator lamination inner peripheral wall and the outer circle diameter D5 of the rotor inner core 4 outer peripheral wall satisfy the following:

[0135]

[0136] It is understandable that when D2 / D5 < 2.5, it means that the inner circle diameter D2 of the stator lamination is too small relative to the outer circle diameter D5 of the rotor inner core 4. This results in an insufficient assembly gap, compressing the space of the rotor assembly 1. During injection molding, material filling is difficult, easily generating significant assembly stress. Excessive assembly stress will cause the stator lamination, rotor inner core 4, and the intermediate rotor assembly 1 to be in a high-stress state even when not in operation. When D2 / D5 > 3.5, it indicates that the inner circle diameter D2 of the stator lamination is too large relative to the outer circle diameter D5 of the rotor inner core 4. This excessive assembly gap prevents the injection-molded connection layer from fully filling, leading to a weak connection between the stator lamination and the rotor inner core 4, significantly reducing connection strength. Simultaneously, the excessive gap also results in a large air gap between the rotor assembly 1 and the stator lamination of the same size, causing magnetic leakage and reducing the efficiency of the motor 100. At the same time, by optimizing the mechanical connection strength and adapting the rotor assembly 1 to a reasonable size, including stabilizing the connection structure, reducing the risk of component damage and enhancing the reliability of the mechanical structure, the overload capacity of the motor 100 can be effectively improved.

[0137] like Figure 8 As shown, the efficiency of motor 100 varies with the value of K. When K is between 17 and 22, the efficiency of motor 100 can be stably maintained within the maximum value range, ensuring the optimal efficiency of motor 100.

[0138] like Figure 9 The figure shows the change of the per-unit efficiency value with the value of K. When K is between 14 and 22, the per-unit back EMF value can be stably maintained within the maximum value range, which can ensure the optimal electromagnetic performance and leave a reasonable margin for manufacturing tolerance.

[0139] like Figure 10 The figure shows a comparison of current and torque between the conventional solution and the present application. It can be seen that as the current increases, the torque increase of the present application is greater than that of the conventional solution.

[0140] like Figure 11 The figure shown is a comparison of the per-unit demagnetizing current of the conventional scheme and the present application. It can be seen that the per-unit demagnetizing current of the present application is increased by 60% compared with the conventional scheme.

[0141] like Figure 12 The figure shown is a comparison of the per-unit back potential values ​​of the conventional scheme and the present application. It can be seen that the per-unit back potential value of the present application is increased by 32% compared with the conventional scheme.

[0142] like Figure 13 The figure shown is a comparison of the per-unit electromagnetic cost of the conventional scheme and the present application. It can be seen that the per-unit back EMF of the present application is reduced by 25% compared with the conventional scheme.

[0143] The compressor according to an embodiment of this application is briefly described below.

[0144] The compressor according to the embodiments of this application includes the motor 100 of any of the above embodiments. Since the compressor according to this embodiment is equipped with the motor 100 of any of the above embodiments, the motor 100 on the compressor according to this application reduces magnetic circuit loss and avoids excessive magnetic circuit saturation by optimizing the structural parameters of the stator assembly 2. This allows the motor 100 to still operate efficiently under high load. Therefore, when the compressor encounters a sudden high load, the motor 100 can also stably drive the compressor to operate, effectively reducing the problem of cooling or heating interruption caused by motor 100 overload shutdown or unstable operation. This improves the operating stability and reliability of the compressor under complex working conditions. By using a motor 100 with high overload capacity, and because the magnetic circuit performance of the motor 100 is optimized, the magnetic circuit loss is low under overload conditions, and the motor 100 generates relatively less heat. This reduces the possibility of damage to the motor 100 windings and internal compressor components due to overheating, reduces the wear and aging rate of parts, and effectively extends the overall service life of the compressor, reducing the maintenance and replacement costs of the equipment.

[0145] The following is a brief description of household appliances according to embodiments of this application.

[0146] The household appliances according to the embodiments of this application include the compressor described in the above embodiments. Since the household appliances according to the embodiments of this application are equipped with the compressor described in the above embodiments, the operation of the household appliances according to the embodiments of this application is stable and reliable. When household appliances such as air conditioners and refrigerators are running in extreme environments or complex working conditions, the optimized stator component structure parameters of the compressor motor can effectively prevent motor overload shutdown. At the same time, the low loss and low heat generation characteristics brought about by the optimized magnetic circuit performance of the motor greatly reduce the aging and wear rate of internal components of the compressor. This will reduce problems such as winding failure caused by motor overheating and wear of internal mechanical parts of the compressor, and effectively extend the overall service life of the compressor. This not only reduces the economic cost of users frequently replacing equipment and reduces the pressure on the environment caused by the disposal of waste electrical appliances, but also reduces the maintenance cost during the life cycle of household appliances.

[0147] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and 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 of this application.

[0148] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0149] In the description of this application, "multiple" means two or more.

[0150] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0151] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0152] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0153] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric machine characterized in that, include: A rotor assembly and a stator assembly, wherein the rotor assembly is disposed radially inside the stator assembly; in The stator assembly includes: A lamination unit, wherein a plurality of said lamination units are arranged circumferentially to form stator laminations, each said lamination unit includes stator teeth and stator yokes, the stator yokes of two adjacent said lamination units are deformably connected to each other, the stator teeth are disposed on the side of the stator yoke facing the rotor assembly, and the stator laminations are constructed in a plurality and are stacked axially to form the stator assembly; The stator tooth width is W1, the stator yoke thickness is H1, the axial distance between adjacent stator teeth in the linear unfolded state of multiple lamination units is t, the minimum distance between adjacent stator teeth in the stator lamination winding state is b, and the minimum distance between the stator tooth and the rotor assembly is δ. in ， And it satisfies 14≤K≤22.

2. The electric machine of claim 1, wherein, The circumscribed circle diameter of the stator assembly's outer peripheral wall is D1, the inscribed circle diameter of the stator assembly's inner peripheral wall is D2, the circumscribed circle diameter of the rotor assembly's outer peripheral wall is D3, and the inscribed circle diameter of the rotor core's inner peripheral wall is D4. , And it satisfies 4≤K1≤7.

3. The electric machine of claim 1, wherein, The inner radial end of the stator tooth is formed with a toothed shoe portion, and the shortest distance L1 between the outer radial surface of the toothed shoe portion and the outer radial surface of the stator yoke portion is given by the following condition: The tooth width W1 of the stator tooth and the radial length L1 of the stator lamination satisfy the following condition: 。 4. The electric machine of claim 1, wherein, Also includes: permanent magnets, the permanent magnets being disposed in the rotor assembly, a length of the permanent magnets in a radial direction being L m ; wherein a tooth width W1 of the stator teeth and a length L of the permanent magnets in a radial direction satisfy: m ​ 。 5. The electric machine of claim 4, wherein, The rotor assembly includes: The rotor lamination has multiple fan-shaped portions spaced apart in the circumferential direction. The multiple rotor laminations are stacked axially so that the fan-shaped portions facing each other in the thickness direction form a magnetic block. A magnetic groove is formed between two adjacent magnetic blocks, and the permanent magnet is housed in the magnetic groove. The permanent magnet has a rectangular cross-section parallel to the rotor lamination.

6. The electric machine of claim 5, wherein, The rotor lamination includes a first rotor lamination and a second rotor lamination; the minimum distance between the radially outer ends of two adjacent sectors in the first rotor lamination is W a , the minimum distance between the radially inner ends of two adjacent sectors in the first rotor lamination is W b , the minimum distance between the radially outer ends of two adjacent sectors in the second rotor lamination is W c , the width of the permanent magnet is W m ; wherein and satisfies: 0.95≤K2≤1.35, and .

7. The electric machine of claim 6, wherein, In the first rotor lamination, in at least two adjacent sector-shaped portions in the circumferential direction, each sector-shaped portion has a first external magnetic bridge protruding from its radially outer end facing each other's sidewalls. The minimum straight-line distance between the ends of two adjacent first external magnetic bridges is W. a ; In the second rotor lamination, in at least two adjacent sector portions in the circumferential direction, each sector portion has a second outer magnetic bridge protruding from its radially inner end facing each other's sidewalls. The minimum linear distance between the ends of two adjacent second outer magnetic bridges is W. c .

8. The electric machine of claim 7, wherein, The arc length of the first outer magnetic bridge in the circumferential direction is greater than the arc length of the second outer magnetic bridge in the circumferential direction, and the rotor core of the rotor assembly is provided with the first rotor lamination on the outermost layer in the thickness direction.

9. The electric machine of claim 8, wherein, A plurality of second rotor laminations and a plurality of first rotor laminations are axially stacked to form the middle portion of the rotor core, or a plurality of second rotor laminations are axially stacked to form the middle portion of the rotor core; At least one of the first rotor laminations is axially stacked on at least one side of the rotor core in the thickness direction at the middle portion.

10. The electric machine of claim 6, wherein, At least one of two circumferentially adjacent sectors in the first rotor lamination is formed with a first inner magnetic bridge, the first inner magnetic bridge is disposed at a radially inner end of the sector and protrudes in the circumferential direction toward the adjacent sector, and a minimum straight-line distance between an end of the first inner magnetic bridge and a side wall of the adjacent sector is W b .

11. The electric machine of claim 10, wherein, The radially inner end of each of the fan-shaped sections on the first rotor lamination is formed with a first inner magnetic bridge on the same side in the circumferential direction, and the minimum distance between the first inner magnetic bridge and the circumferential side wall of the adjacent fan-shaped section is W b .

12. The electric machine of any of claims 1-11, wherein, Also includes: The rotor inner core has mounting holes for connecting the rotor shaft. The rotor inner core is located at the center of the rotor assembly, and the outer peripheral wall of the rotor inner core is injection molded to the inner peripheral wall of the rotor assembly.

13. The electric machine of claim 12, wherein, The outer diameter of the outer circumscribed circle of the rotor inner core is D5, and the inner diameter of the inner circumscribed circle of the rotor inner core is D6, and the following conditions are met: 。 14. The motor according to claim 13, characterized in that, The inner diameter D2 of the stator lamination inner circumferential wall and the outer diameter D5 of the rotor inner core outer circumferential wall satisfy the following: 。 15. A compressor characterized by, Includes the motor described in any one of claims 1-14.

16. A domestic appliance characterized in that, Includes the compressor as described in claim 15.

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