Electric machine, compressor and refrigeration device

Abstract

This invention discloses an electric motor, a compressor, and a refrigeration device, relating to the field of refrigeration equipment technology. The electric motor includes a rotor and a stator, the rotor having p poles; the remanence of the permanent magnet is B. r The total cross-sectional area of ​​all permanent magnets perpendicular to the rotor axis under each magnetic pole is S; the stator includes multiple stacked stator laminations made of amorphous alloy material, with a stacking factor of F and a thickness of h; each stator lamination includes a stator yoke and multiple stator teeth located inside the stator yoke, with stator slots formed between adjacent stator teeth, a circumferential width of w1, and a number of stator slots. This scheme designs the width of the stator teeth based on the thickness of a single amorphous alloy stator lamination and, through relevant constraint parameters, ensures that the magnetic flux density of the motor is below the saturation point of the amorphous alloy material, avoiding oversaturation and resulting in decreased motor efficiency.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and particularly to a motor, compressor and refrigeration equipment. Background Technology

[0002] The energy efficiency requirements for compressors in home appliances such as air conditioners and refrigerators are becoming increasingly stringent. Amorphous alloys, due to their extremely low iron loss characteristics, have become an ideal choice for improving motor energy efficiency. However, amorphous alloys have a lower saturation magnetic flux density (lower than that of traditional silicon steel). If conventional motor structure designs are used, it can easily lead to saturation of the stator core magnetic circuit, which will cause a sharp increase in iron loss, preventing the low iron loss advantage from being realized and even reducing motor efficiency. Summary of the Invention

[0003] The main objective of this invention is to provide an electric motor, compressor, and refrigeration equipment to solve the aforementioned problems.

[0004] To achieve the above objectives, the present invention provides a motor comprising:

[0005] The rotor has multiple permanent magnet slots with built-in permanent magnets evenly distributed along its circumference. Each permanent magnet slot corresponds to a magnetic pole, and the rotor has p poles. The remanence of the permanent magnets is B. r And the sum of the cross-sectional areas of all permanent magnets under each magnetic pole perpendicular to the rotor axis is S; and

[0006] The stator, in which the rotor is rotatably disposed, comprises a plurality of stacked stator laminations made of amorphous alloy material. The stacking factor of the stator is F, and the thickness of the stator laminations is h. Each stator lamination includes a stator yoke and a plurality of stator teeth disposed inside the stator yoke. Adjacent stator teeth form stator slots, the number of which is a. The minimum radial width of the stator yoke is w2, and the circumferential width of the stator teeth is w1. The following relationship is satisfied: .

[0007] In one implementation, .

[0008] In one implementation, .

[0009] In one embodiment, the maximum relative permeability of the stator is μ1, and the maximum relative permeability of the rotor is μ2, where μ1 > μ2.

[0010] In one embodiment, the thickness of the permanent magnet in the magnetization direction is h. m And the coercivity is H cj ; Satisfying the relation: 3.4.

[0011] In one embodiment, the permanent magnet slot assembly is V-shaped, U-shaped, or straight.

[0012] In one embodiment, the permanent magnet slot assembly includes at least two magnet slots.

[0013] The present invention also proposes a compressor, including a main housing, a motor and a pump assembly as described above, wherein the motor and the pump assembly are both disposed within the main housing, and the inner wall of the main housing is in clearance fit with the stator; the pump assembly is located below the motor, and the pump assembly includes a crankshaft, which is in drive fit with the rotor.

[0014] In one embodiment, the gap between the inner wall of the main housing and the stator ranges from 0.02 mm to 0.15 mm.

[0015] The present invention also proposes a refrigeration device, including the compressor described above.

[0016] The technical solution of this invention establishes a balance between material properties (such as saturation magnetic flux density) and motor losses (iron losses, copper losses). Based on the remanence and cross-sectional area of ​​the permanent magnet, the width of the stator teeth is designed according to the thickness of the stator lamination of the single amorphous alloy. This ensures that the magnetic flux density of the motor is below the material saturation point, avoiding oversaturation which would reduce motor efficiency. At the same time, it avoids excessive stator tooth width occupying too much stator slot area, which would reduce winding usage and increase copper losses. (If saturation is avoided simply by increasing the width of the stator teeth / yoke, the stator slot area (winding placement space) will be compressed, resulting in a reduction in the number of winding turns or a reduction in conductor cross-sectional area, increasing resistance and copper losses.) The formula of this solution minimizes the tooth size while ensuring that the magnetic flux density is not saturated, through the matching relationship between the tooth width w1 and the permanent magnet parameters. This provides sufficient slot area for the winding, ensuring that the winding usage (number of turns, conductor cross-sectional area) meets the design requirements, thereby reducing copper losses and minimizing total losses, thus reducing motor efficiency. In other words, while limiting the size of the stator teeth, the slot area is guaranteed, ensuring sufficient winding capacity, reducing copper loss, and comprehensively improving the efficiency of the compressor motor. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the compressor provided by the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the structure of one embodiment of the electric motor;

[0020] Figure 3 for Figure 1 A schematic diagram of another embodiment of the motor;

[0021] Figure 4 for Figure 1 A schematic diagram of another embodiment of the motor;

[0022] Figure 5 A schematic diagram of a stator embodiment provided by the present invention;

[0023] Figure 6 A comparison chart of the energy efficiency of conventional compressors and the compressor provided by this invention under different operating conditions;

[0024] Figure 7 For compressor energy efficiency A diagram illustrating the change in the ratio;

[0025] Figure 8 For compressor energy efficiency A diagram illustrating the change in the ratio;

[0026] Figure 9 For compressor energy efficiency A diagram illustrating the change in the ratio;

[0027] Figure 10 The demagnetization rate of the motor varies with A diagram illustrating the change in the ratio.

[0028] Explanation of icon numbers:

[0029] 100. Rotor; 110. Permanent magnet slot assembly;

[0030] 200. Permanent magnet;

[0031] 300. Stator; 310. Stator lamination; 311. Stator yoke; 312. Stator teeth; 313. Stator slot;

[0032] 400. Main shell;

[0033] 500. Pump body assembly; 510. Crankshaft.

[0034] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention 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.

[0037] Furthermore, if the embodiments of this invention 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. Thus, 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 implies 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 invention.

[0038] Amorphous alloys are ideal for improving motor efficiency due to their extremely low iron loss characteristics. However, amorphous alloys have a lower saturation magnetic flux density (lower than that of traditional silicon steel). If conventional motor structure designs are used, it can easily lead to stator core magnetic circuit saturation, which will cause iron loss to rise sharply, making it impossible to take advantage of their low iron loss and even reducing motor efficiency.

[0039] In conventional motor design, the tooth width (w1) and yoke width (w2) are appropriately increased to reduce copper loss and thus reduce the space occupied by the winding. However, excessive tooth / yoke width in amorphous materials can cause the magnetic flux density to exceed the saturation point. If conventional motor design is followed (e.g., unreasonable tooth and yoke dimensions), the magnetic flux density of the tooth or yoke of the amorphous stator core will exceed the material saturation point, resulting in a sharp increase in iron loss and a decrease in energy efficiency, thus failing to fully utilize the performance advantages of amorphous materials.

[0040] To address this issue, the present invention proposes a motor, a compressor, and a refrigeration device. The aim is to improve motor energy efficiency by controlling the magnetic flux density of the stator teeth and yoke to solve the magnetic circuit saturation problem in optimized amorphous alloy stators.

[0041] Please see Figure 1 In one embodiment of the present invention, the motor includes a rotor 100 and a stator 300; see reference 100. Figure 2 The rotor 100 has multiple permanent magnet slot groups 110 with built-in permanent magnets 200 evenly distributed along its circumference. Each permanent magnet slot group 110 includes at least two magnet slots (each magnet slot contains a permanent magnet 200), and each permanent magnet slot group 110 corresponds to one magnetic pole. The rotor 100 has p poles, and the remanence of the permanent magnets 200 is B. r , combined Figure 3 The total cross-sectional area of ​​all permanent magnets 200 under each magnetic pole, perpendicular to the stacking direction of the rotor 100, is S; the rotor 100 is rotatably disposed within the stator 300, which includes multiple stacked stator laminations 310, made of amorphous alloy material, and the stacking factor of the stator 300 is F, as shown in the reference. Figure 4 The thickness of the stator lamination 310 is h; refer to Figure 3 The stator lamination 310 includes a stator yoke 311 and multiple stator teeth 312 on its inner side. Stator slots 313 are formed between adjacent stator teeth 312. The width of the stator teeth 312 along the circumferential direction is w1, and the number of stator slots 313 is a; satisfying the following relationship: .

[0042] This motor is suitable for compressor applications. The rotor 100 incorporates a permanent magnet 200 to provide a magnetic field, while the stator 300 generates a rotating magnetic field through current flowing through its windings. Together, they convert electrical energy into mechanical energy. In traditional designs, the stator laminations 310 are typically formed by stacking silicon steel sheets to create the stator core, resulting in high iron losses. In this design, the stator core is made of an amorphous alloy material, bonded and stacked using epoxy adhesive, leveraging the low iron loss characteristics of the amorphous alloy to reduce iron consumption.

[0043] Regarding molecular parameters:

[0044] B r Remanence of permanent magnet 200 (unit: Tesla, T): characterizes the maximum magnetic flux density of permanent magnet 200 in the open circuit state.

[0045] S: The total cross-sectional area of ​​all permanent magnets under one pole, perpendicular to the stacking direction (unit: mm). 2 That is, the cross-sectional area (length × width) of a single permanent magnet 200 multiplied by the number of permanent magnets 200 under that pole.

[0046] Molecules (S×B) r The value represents the total magnetic flux (magnetic flux = magnetic density × area) provided by the unipolar permanent magnet 200, reflecting the maximum potential magnetic flux capability that the permanent magnet 200 can provide.

[0047] Regarding the denominator parameter:

[0048] w1: Width of stator tooth 312 along the circumferential direction (unit: mm).

[0049] F: Overlap factor (dimensionless, 0.88~0.92). The overlap factor F is a parameter that balances the magnetic permeability and brittleness of amorphous alloys.

[0050] p: Number of rotor poles (dimensionless, such as 4 poles or 6 poles).

[0051] h: Thickness of a single stator lamination (unit: mm).

[0052] Stator yoke width w2: Minimum radial width of the yoke (unit: mm).

[0053] The denominator (w1×F×p×h) represents the maximum magnetic flux capacity that stator tooth 312 can carry (tooth magnetic conductive area = tooth width × lamination thickness × stacking coefficient × pole number distribution).

[0054] (S×B) r The ratio of (w1×F×p×h) is dimensionless. By limiting the ratio to 24~50, it is ensured that the actual magnetic flux density of the stator tooth 312 is below the saturation point of the amorphous alloy, thus avoiding the increase in iron loss caused by magnetic saturation. At the same time, it prevents the tooth from being too wide and encroaching on the slot area (ensuring the amount of copper wire used in the winding and reducing copper loss).

[0055] This solution establishes a balance between material properties (such as saturation magnetic flux density) and motor losses (iron losses, copper losses). Based on the remanence and cross-sectional area of ​​the permanent magnet 200, the width of the stator tooth 312 is designed according to the thickness of the stator lamination 310 made of a single piece of amorphous alloy material. This ensures that the magnetic flux density of the motor is below the saturation point of the amorphous alloy material, avoiding oversaturation that would reduce motor efficiency. At the same time, it avoids the stator tooth 312 being too wide, occupying too much area of ​​the stator slot 313, which would reduce the amount of windings used and increase copper losses. This minimizes total losses and reduces motor efficiency.

[0056] Regarding parameter measurement:

[0057] B r Remanence can be directly measured using a permanent magnet 200 performance tester.

[0058] S: Measure the dimensions (length L, width W) of a single permanent magnet 200 perpendicular to the stacking direction; calculate the area of ​​a single piece L×W=S1; count the number n of permanent magnets 200 under one pole, then S=n×S1.

[0059] w1: Remove the stator core and observe the lamination teeth (including the tooth body and tooth shoe); use vernier calipers to measure the maximum width of the tooth body (the tooth body shape may be rectangular or trapezoidal) along the circumference (take the average of 3 teeth).

[0060] h: Remove the single stator lamination 310; use a micrometer to measure the thickness of the lamination (take the average of 3 different positions).

[0061] In summary, traditional structures, lacking targeted parameter matching, are prone to problems such as "using amorphous materials but experiencing magnetic circuit saturation, resulting in lower efficiency than silicon steel sheet motors." The technical solution of this invention, through parameter matching design (such as the correlation between tooth width, yoke width, and permanent magnet 200 parameters), ensures that the stator 300 magnetic flux density is below the saturation point of the amorphous alloy, avoiding increased iron loss caused by magnetic circuit saturation and maximizing the utilization of the low iron loss advantage of amorphous materials.

[0062] Traditional solutions simply increase the width of the stator teeth 312 / yoke to avoid saturation, which compresses the area of ​​the stator slots 313 (winding placement space), resulting in a reduction in the number of winding turns or the cross-sectional area of ​​the conductors, increased resistance, and increased copper losses. This solution calculates the matching relationship between the tooth width w1 and the parameters of the permanent magnet 200, minimizing the tooth size while ensuring that the magnetic flux density is not saturated. This allows for sufficient slot area to be reserved for the windings, ensuring that the winding usage (number of turns, conductor cross-sectional area) meets the design requirements, thereby reducing copper losses.

[0063] Combination Figure 3 Furthermore, The formula has been dimensionless.

[0064] If the ratio is too small, the permanent magnet 200 will be too weak, or the stator teeth will be too wide / too many slots / too thick laminations (too large a denominator), resulting in low air gap magnetic flux density and insufficient motor torque, leading to a decrease in compressor discharge capacity or energy efficiency. If the ratio is too large, the permanent magnet 200 will be too strong, or the stator teeth will be too narrow, too few slots, or too thin laminations, resulting in excessively high stator tooth magnetic flux density 312, approaching or exceeding the saturation point, leading to a sharp increase in magnetic reluctance, increased iron loss, and a decrease in efficiency. By maintaining a ratio between 22 and 32, the amorphous alloy stator motor achieves the optimal balance between high magnetic flux density utilization and saturation prevention, thereby realizing the high efficiency and high reliability required for compressor applications.

[0065] Combination Figure 3 Furthermore, The formula has been dimensionless.

[0066] w2 is the minimum radial width of the stator yoke 311 (unit: mm), which is the minimum size of the stator yoke 311 in the radial direction (determining the magnetic conductive area of ​​the yoke). When measuring, find the narrowest point of the stator yoke 311 (usually at the midpoint between two slots, as the slot opening may cause the yoke to narrow locally); use vernier calipers to measure the radial width at this position (i.e., the minimum ring width of the annular stator yoke 311), and take the average value of 3 different positions.

[0067] molecular: This represents the maximum potential magnetic flux capability that the permanent magnet 200 can provide.

[0068] Denominator: It can be understood as the total equivalent magnetic circuit cross-sectional area of ​​the entire stator yoke 311 in a single layer (because the number of slots a determines the number of magnetic poles / teeth, indirectly reflecting the number of magnetic circuit branches).

[0069] If the ratio is too small, the permanent magnet 200 will be too weak, or the yoke will be too wide, the laminations too thick, or the number of slots too many, resulting in material waste, increased motor size / cost, and insufficient output torque.

[0070] If the ratio is too large, the permanent magnet 200 will be too strong, or the yoke will be too narrow, the laminations too thin, or the number of slots too few, resulting in an excessively high magnetic flux density in the stator yoke 311. This will cause a sharp increase in magnetic reluctance and a significant increase in iron loss, which in turn will lead to a decrease in the overall energy efficiency of the machine.

[0071] By limiting the ratio to between 20 and 40, the magnetic flux circuit is ensured to be neither too redundant nor saturated, thereby achieving a balance between high efficiency and lightweight design in the compressor motor.

[0072] Specifically, 0.88≤F≤0.92. F is the stacking factor of stator 300, which is a parameter that balances the magnetic permeability efficiency and material brittleness of the amorphous alloy.

[0073] Combination Figure 5 Specifically, the multiple stacked stator laminations 310 are bonded and fixed together using epoxy adhesive. After curing, the epoxy adhesive forms a high-strength bond (higher than the shear strength of traditional riveting). Epoxy adhesives are resistant to media corrosion and insoluble in commonly used refrigerants and lubricants inside the compressor, such as two-component solvent-free epoxy adhesives, toughened epoxy structural adhesives, and high-temperature resistant epoxy films. They can adapt to the temperature rise during compressor motor operation, avoiding bonding failure due to high-temperature aging, and are immiscible with the refrigerants and lubricants inside the compressor, making them difficult to peel off. The bonding process can be referenced from relevant technologies; a brief introduction is provided here: after pre-treating the laminations, adhesive is applied. The application method is not limited, and the thickness of the adhesive layer can be determined according to specific design requirements. The adhesive application area mainly covers the toothed and yoke magnetic conductive areas of the laminations. The stator laminations 310 are then stacked and formed, and finally cured to achieve the desired shape.

[0074] Specifically, the permanent magnet slot group 110 is V-shaped, U-shaped, or straight.

[0075] In the linear configuration, permanent magnets 200 are arranged in a straight line along the circumference of rotor 100, and the magnetic pole axis is consistent with the radial direction of rotor 100. A single magnetic pole is usually composed of 1 to 2 rectangular permanent magnets 200, which are directly embedded in the magnet slot of rotor 100.

[0076] In the V-type configuration, each pole consists of two permanent magnets 200 arranged symmetrically in a "V" shape (angle θ = 60°~120°), with the center of the magnetic pole pointing towards the center of the rotor 100. A magnetic isolation bridge or air magnetic isolation is provided between the permanent magnets 200 to reduce magnetic leakage between poles. The air gap magnetic flux density waveform can be optimized by adjusting the V-shaped angle.

[0077] In the U-shape, each pole consists of three or more permanent magnets 200. The permanent magnets 200 have a large contact area with the iron core of the rotor 100, the magnetic circuit is short and symmetrical, and magnetic barrier slots are easily set at the slot opening to suppress magnetic leakage.

[0078] Furthermore, the maximum relative permeability of the stator 300 is μ1, and the maximum relative permeability of the rotor 100 is μ2, where μ1 > μ2. Since the stator uses a high-permeability material (such as an amorphous alloy), its maximum relative permeability μ1 is relatively high; while the rotor 100 has embedded permanent magnets 200 with similar relative permeability, resulting in a significant reduction in the overall equivalent maximum relative permeability μ2 of the rotor 100 in the magnetic circuit direction. By satisfying μ1 > μ2, magnetic flux can be effectively guided into the stator through the air gap, reducing internal magnetic leakage in the rotor 100, improving motor efficiency and power factor, and helping to suppress eddy current losses in the rotor 100.

[0079] Furthermore, the thickness of the permanent magnet 200 in the magnetization direction is h. m And the coercivity is H cj ; Satisfying the relation: 3.4. The formula has been dimensionless.

[0080] h m The thickness of the permanent magnet 200 in the magnetization direction (unit: mm), usually the radial thickness.

[0081] H cj The coercivity of permanent magnet 200 (unit: kA / m) characterizes its resistance to demagnetization.

[0082] It can be regarded as the geometric product of the key cross sections of the stator magnetic circuit, reflecting the cross-sectional area of ​​the magnetic circuit.

[0083] It can be regarded as the product of the permeability of the stator and rotor 100 materials, which characterizes the magnetic permeability of the entire magnetic circuit.

[0084] The demagnetization resistance index (thickness × coercivity) of permanent magnet 200 is as follows: the larger the value, the more difficult it is to demagnetize.

[0085] p: The more poles there are, the smaller the magnetic flux per pole, but the higher the frequency of the reverse demagnetizing field, and the greater the risk of demagnetization.

[0086] If the ratio is too small, the stator teeth / yoke will be too narrow, or the permeability will be low, or the permanent magnet 200 will be too thick / the coercivity will be too high / the number of poles will be too many, resulting in excessive magnetic reluctance and insufficient air gap magnetic density, leading to low output torque and poor efficiency.

[0087] If the ratio is too large, the magnetic conductivity of the magnetic circuit will be too strong, while the permanent magnet 200 will be relatively weak, leading to the risk of demagnetization.

[0088] By limiting the ratio to between 1 and 3.4, it is ensured that when the motor uses high magnetic permeability materials (such as amorphous alloys), it can achieve high efficiency while avoiding irreversible demagnetization under high temperature or overload conditions.

[0089] Reference Figure 1 The present invention also proposes a compressor, which includes a main housing 400, a pump assembly 500, and a motor. The specific structure of the motor is as described in the above embodiments. Since this compressor 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, and will not be described in detail here. The motor and the pump assembly 500 are both disposed inside the main housing 400, and the inner wall of the main housing 400 is clearance-fitted with the stator 300; the pump assembly 500 is located below the motor, and the pump assembly 500 includes a crankshaft 510, which is driven by the rotor 100.

[0090] The main housing 400 carries the motor and pump assembly 500, forming a refrigerant compression chamber that isolates the internal high pressure from the external environment. The motor (referring to the aforementioned scheme) is mounted on the upper part of the main housing 400, with the stator 300 clearance-fitted to the inner wall of the main housing 400. The rotor 100 is supported by bearings on the end cover of the main housing 400. The motor provides the power source, driving the crankshaft 510 to rotate via the rotor 100. The pump assembly 500 includes the crankshaft 510, cylinder, piston, valve plate assembly (intake valve + exhaust valve), etc., and is mounted on the lower part of the main housing 400. The crankshaft 510 drives the piston to reciprocate within the cylinder, completing the intake-compression-exhaust cycle.

[0091] Specifically, the gap between the inner wall of the main housing 400 and the stator 300 is in the range of 0.02mm-0.15mm.

[0092] The table below shows the compressor energy efficiency (%) of the conventional scheme and the compressor energy efficiency (%) of the motor using this scheme. The conventional scheme does not limit the dimensions of the stator teeth 312 and stator slots 313, while this scheme limits the motor dimensions using the aforementioned formula. SEER 30 / 60 / 90 represents the operating frequency of 30Hz / 60Hz / 90Hz, indicating low, medium, and high load operation of the compressor, respectively.

[0093]

[0094] Combination Figure 6As can be seen from the data, the compressor using this solution shows improved energy efficiency under different operating conditions, with the largest improvement (1.08%) under SEER 30 (low load). Based on the remanence and cross-sectional area of ​​the permanent magnet 200, the width of the stator teeth 312 is designed according to the thickness of the stator lamination 310 of the single amorphous alloy. This ensures that the magnetic flux density of the motor is below the material saturation point, avoiding oversaturation that would reduce motor efficiency. At the same time, it avoids the stator teeth 312 being too wide, occupying too much area of ​​the stator slots 313, which would reduce the winding amount and increase copper loss, thereby minimizing total loss and reducing motor efficiency.

[0095] This solution integrates the motor into the compressor, resulting in improved energy efficiency across the entire operating range, with particularly significant advantages under mild conditions, and enhanced stability across a wider range of operating conditions. Combined with the widespread application of compressors (such as in air conditioning and cold chain logistics), this can generate significant social energy-saving benefits.

[0096] The following table is (S×B) r ) / (w1×F×p×h)The corresponding compressor energy efficiency (%) under different ratios.

[0097]

[0098] Combination Figure 7 It can be seen that the compressor's energy efficiency increases with (S×B) r The ratio of (w1×F×p×h) exhibits a non-linear trend of "first rising and then falling." As shown in the graph, within the range of 24 to 50, the energy efficiency remains at a high level of 654.7% to 655.6%, peaking at 655.6% at 35 and still maintaining 650% at 50. At this point, the numerator and denominator reach dynamic equilibrium, indicating the highest energy efficiency of the motor. Although the energy efficiency gradually decreases after the formula value exceeds 50, it still maintains good energy efficiency at 50. Therefore, limiting the formula ratio to the range of 24 to 50 can maximize the energy efficiency of the compressor.

[0099] Reference Figure 8 In the figure (X-axis) is Ratio. The vertical axis (Y-axis) represents the compressor's energy efficiency as a percentage, indicating the overall energy conversion efficiency of the compressor. The curve is inverted U-shaped (rising first and then falling). As the ratio increases, the compressor's energy efficiency first increases and then decreases. When this parameter is in the range of 22 to 32, the energy efficiency reaches its peak, while avoiding the increase in iron loss caused by stator core saturation. The system achieves the optimal balance between electromagnetic performance and material utilization.

[0100] Reference Figure 9 In the figure (X-axis) is Ratio. The vertical axis (Y-axis) represents the compressor's energy efficiency (%), indicating the overall energy conversion efficiency of the compressor. The curve is inverted U-shaped (rising first and then falling). As the ratio increases, the compressor's energy efficiency first increases and then decreases. When this parameter is in the range of 20 to 40, the energy efficiency reaches its peak, while avoiding the increase in iron loss caused by the saturation of the stator yoke 311. The system achieves the optimal balance between electromagnetic performance and material utilization.

[0101] Reference Figure 10 The horizontal axis (X-axis) in the figure is Ratio. The vertical axis (Y-axis) represents the motor demagnetization rate (%). A higher demagnetization rate indicates faster performance degradation of the permanent magnet, resulting in reduced motor efficiency and output torque. As shown in the figure, the curve is U-shaped (first decreasing and then increasing). With the increase of the ratio, the motor demagnetization rate curve first decreases and then increases. When this parameter is in the range of 1 to 3.4, the energy efficiency reaches its peak, avoiding irreversible demagnetization of the permanent magnet 200 due to the reverse magnetic field. If the value is less than 1, non-uniform demagnetization may occur due to the thickness of the permanent magnet or the weakness of the reverse field. If the value is greater than 3.4, the permanent magnet may be exposed to a high-intensity reverse magnetic field due to its thinness and strong reverse field, increasing the risk of demagnetization. The range of 1 to 3.4 represents a safe and efficient demagnetization control area. At this time, the corresponding motor efficiency and output torque are better, and the system achieves the optimal balance between energy efficiency and the safety of the permanent magnet 200.

[0102] This invention also proposes a refrigeration device, including the aforementioned compressor. Examples include household air conditioners, heat pumps for new energy vehicles, and refrigerators / freezers.

[0103] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An electric motor for use in a compressor, characterized in that, The motor includes: The rotor has multiple permanent magnet slots with built-in permanent magnets evenly distributed along its circumference. Each permanent magnet slot corresponds to a magnetic pole, and the rotor has p poles. The remanence of the permanent magnets is B. r And the sum of the cross-sectional areas of all permanent magnets under each magnetic pole perpendicular to the rotor axis is S; and The stator, in which the rotor is rotatably disposed, comprises a plurality of stacked stator laminations made of amorphous alloy material. The stacking factor of the stator is F, and the thickness of the stator laminations is h. Each stator lamination includes a stator yoke and a plurality of stator teeth disposed inside the stator yoke. Adjacent stator teeth form stator slots, the number of which is a. The minimum radial width of the stator yoke is w2, and the circumferential width of the stator teeth is w1. The following relationship is satisfied: .

2. The motor as described in claim 1, characterized in that, 。 3. The motor as described in claim 1, characterized in that, Satisfying Relationship: .

4. The motor as described in claim 1, characterized in that, The maximum relative permeability of the stator is μ1, and the maximum relative permeability of the rotor is μ2, where μ1 > μ2.

5. The motor as described in claim 4, characterized in that, The thickness of the permanent magnet in the magnetization direction is h. m And the coercivity is H cj Satisfying the relation: 3.

4.

6. The motor as described in claim 1, characterized in that, The stator laminations, which are stacked in multiple layers, are bonded together with epoxy adhesive.

7. The motor as described in claim 1, characterized in that, The permanent magnet slot group is V-shaped, U-shaped, or straight; and / or, the permanent magnet slot group includes at least two magnet slots.

8. A compressor, characterized in that, include Main shell; The motor as claimed in any one of claims 1 to 7; and The pump body assembly, including both the motor and the pump body assembly, is located within the main housing, with the inner wall of the main housing having a clearance fit with the stator; the pump body assembly is located below the motor, and includes a crankshaft that is driven by the rotor.

9. The compressor as claimed in claim 8, characterized in that, The gap between the inner wall of the main housing and the stator ranges from 0.02mm to 0.15mm.

10. A refrigeration device, characterized in that, Includes the compressor as described in claim 8 or claim 9.

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