Motor, compressor and refrigeration equipment

Abstract

The utility model discloses a motor, compressor and refrigeration equipment relates to motor technical field, the motor includes stator subassembly and rotor, the stator subassembly includes stator, insulating layer and a plurality of windings, stator has a plurality of winding slots that are distributed along its circumference at intervals, insulating layer is provided on the inner wall of winding slot, and the winding slot is provided with a plurality of windings. The stator comprises a plurality of stator units which are arranged at intervals in the circumferential direction of the stator; the cross sectional area of each winding groove is S1 (mm < 2 >), the cross sectional area of each insulating layer is S2 (mm < 2 >), the outer diameter of each turn of wire of each winding is D (mm), the total number of turns of the windings in each winding groove is N, the maximum rotating speed of the motor is Nmax (rps), 0.7 < = N * D2 / (S1-S2) < = 0.95, and when the sufficiently high filling rate is ensured, the groove utilization rate is improved, the resistance is reduced, the winding difficulty is avoided, 125 rps < = Nmax < = 165 rps, the rotating speed of the motor of the compressor is increased, and the service life of the compressor is prolonged. The same cooling capacity can be achieved, and the displacement of the compressor is reduced, so that the current of the compressor is reduced, the winding loss of the motor is reduced, and the energy efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, especially a kind of motor, compressor and refrigeration equipment. BACKGROUND

[0002] In the traditional motor design, such as the motor used in compressor, the stator structure usually includes stator unit, coil and slot insulation paper for isolating stator unit and winding. The stator unit is composed of multiple teeth and yoke, and the coil is wound through the slot between the teeth, and in the design of stator, in order to improve the overall performance of motor, improving the filling rate of coil in slot (i.e. the proportion of coil to slot area) is a key target. For this purpose, an improved method is to use multiple segmented cores in arc shape to construct stator unit, which can more efficiently utilize the slot space, and the segmented cores are unfolded into straight line state during winding process to expand the space of slot, so that the winding process is more smooth and allows more coils to fill into the slot.

[0003] However, this method using segmented cores can cause the decline of motor efficiency, because the segmented cores can affect the energy efficiency performance of motor. Therefore, how to maximize the motor efficiency without sacrificing the performance of motor has become a problem that needs to be further studied. SUMMARY

[0004] The main purpose of the utility model is to provide a kind of motor, compressor and refrigeration equipment, to solve how to maximize the motor efficiency without sacrificing the performance of motor.

[0005] To achieve the above purpose, the motor provided by the utility model comprises:

[0006] A stator assembly comprising a stator, an insulation layer and multiple windings, the stator has multiple winding slots arranged at intervals in its circumferential direction, the insulation layer is arranged on the inner wall of the winding slot, the stator comprises multiple stator units arranged at intervals in its circumferential direction, the stator unit comprises a yoke portion, a tooth portion and a shoe portion, the tooth portion is arranged radially inside the yoke portion, the shoe portion is arranged at one end of the tooth portion away from the yoke portion, the winding slot is formed between two adjacent tooth portions, and the winding is wound on the corresponding tooth portion; and

[0007] A rotor located radially inside the stator assembly.

[0008] Wherein, the cross-sectional area of the winding slot is S1 (mm 2 ), and the cross-sectional area of the insulation layer is S2 (mm 2each turn wire of each winding is D (mm), the total number of turns of the winding in each winding slot is N, the maximum rotating speed of the motor is Nmax (rps), 0.7≤N×D 2 / (S1-S2)≤0.95, and 125 rps≤Nmax≤165 rps.

[0009] In an embodiment, the outer diameter of the stator is Do (mm), the inner diameter is Di (mm), and 0.5≤Di / Do≤0.6.

[0010] In an embodiment, the axial height of the stator is T (mm), and 0.23≤T / Do≤0.55.

[0011] In an embodiment, the number of tooth portions is Z, the number of poles of the motor is P, and Z / P=3 / 2, wherein Z is set to 9 or 12.

[0012] In an embodiment, two adjacent yoke portions are welded.

[0013] In an embodiment, the stator units are located at two ends in the circumferential direction of the stator, one end is provided with a positioning protrusion, and the other end is provided with a positioning groove, and two adjacent stator units are positioned and matched through the positioning protrusion and the positioning groove.

[0014] In an embodiment, the yoke portion has two yoke segments separately arranged on both sides of the tooth portion, and the included angle formed between the tooth portion and the two yoke segments is θ, and 80°≤θ≤100°.

[0015] The utility model also provides a kind of compressor, the compressor includes motor, and the motor includes:

[0016] Stator assembly, including stator, insulating layer and multiple windings, the stator has multiple winding slots arranged at intervals in its circumferential direction, the insulating layer is arranged on the inner wall of the winding slot, the stator includes multiple stator units arranged at intervals in its circumferential direction, the stator unit includes yoke portion, tooth portion and boot portion, the tooth portion is arranged on the radially inner side of the yoke portion, the boot portion is arranged on the end of the tooth portion away from the yoke portion, the winding slot is formed between two adjacent tooth portions, and the winding is wound on the corresponding tooth portion;And,

[0017] Rotor, located on the radially inner side of the stator assembly.

[0018] Wherein, the cross-sectional area of the winding slot is S1 (mm 2 , the cross-sectional area of the insulating layer is S2 (mm 2each turn of wire of each of the windings has an outer diameter of D (mm), a total number of turns of the windings within each of the wire slots is N, a maximum rotational speed of the motor is Nmax (rps), 0.7≤N×D 2 / (S1-S2)≤0.95, and 125 rps≤Nmax≤165 rps.

[0019] The utility model also provides a refrigeration equipment, refrigeration equipment includes compressor, the compressor includes motor, the motor includes:

[0020] A stator assembly includes a stator, an insulation layer, and a plurality of windings, the stator has a plurality of wire slots spaced apart along its circumference, the insulation layer is disposed on the inner wall of the wire slot, the stator includes a plurality of stator units spaced apart in its circumference, the stator unit includes a yoke portion, a tooth portion, and a shoe portion, the tooth portion is disposed radially inward of the yoke portion, the shoe portion is disposed at an end of the tooth portion away from the yoke portion, the wire slot is formed between two adjacent tooth portions, and the winding is wound on the corresponding tooth portion.

[0021] A rotor is located radially inward of the stator assembly.

[0022] Wherein, the cross-sectional area of the wire slot is S1 (mm 2 ), the cross-sectional area of the insulation layer is S2 (mm 2 ), each turn of wire of each of the windings has an outer diameter of D (mm), a total number of turns of the windings within each of the wire slots is N, a maximum rotational speed of the motor is Nmax (rps), 0.7≤N×D 2 / (S1-S2)≤0.95, and 125 rps≤Nmax≤165 rps.

[0023] In an embodiment, the refrigeration equipment includes an air conditioner.

[0024] The technical scheme of the utility model controls N×D2 / (S1-S2) between 0.7 and 0.95, guarantees a high enough filling rate, improves slot utilization, reduces resistance, improves efficiency, avoids winding difficulty caused by a too high filling rate, controls the maximum rotational speed of the motor between 125 rps and 165 rps, improves the rotational speed of the motor of the compressor, achieves the same refrigerating capacity, reduces the displacement of the compressor, thereby reducing the current of the compressor, reduces the winding loss of the motor, improves energy efficiency, and solves how to maximize motor efficiency without sacrificing motor performance. BRIEF DESCRIPTION OF DRAWINGS

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the structure of an embodiment of the compressor provided by this utility model;

[0027] Figure 2 A schematic diagram of the structure of an embodiment of the motor provided by this utility model;

[0028] Figure 3 A schematic diagram of another embodiment of the motor provided by this utility model;

[0029] Figure 4 for Figure 2 A partial structural diagram of the winding groove;

[0030] Figure 5 for Figure 4 A schematic diagram of a portion of the structure with an insulating layer installed at the winding groove;

[0031] Figure 6 The relationship between the compressor energy efficiency COP and process problem rate and N×D2 / (S1-S2) provided by this utility model;

[0032] Figure 7 The present invention relates the compressor motor efficiency and wear yield under extreme conditions to the speed.

[0033] Explanation of icon numbers:

[0034] 100. Motor; 1. Stator assembly; 11. Stator; 10. Stator unit; 101. Yoke; 1011. Yoke segment; 102. Tooth; 103. Shoe; 104. Positioning protrusion; 105. Positioning slot; 12. Insulation layer; 13. Winding; a. Winding slot; 2. Rotor;

[0035] 200. Compressor.

[0036] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0037] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0038] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture, and if the specific posture changes, the directional indications will also change accordingly.

[0039] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel solutions are included, for example, "A and / or B" includes A solution, or B solution, or A and B solutions. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0040] In traditional motor design, such as the motor used in a compressor, the stator structure usually includes a stator unit, coils, and slot insulating paper for isolating the stator unit and the windings. The stator unit is composed of multiple teeth and a yoke, while the coils are wound through the slots between the teeth. In the design of the stator, in order to improve the overall performance of the motor, increasing the filling rate of the coils in the slots (i.e., the proportion of the coil area to the slot area) is a key target. To this end, one improved method is to use multiple segmented cores in the form of circular arcs to construct the stator unit, which can more efficiently utilize the slot space and expand the slot space by unfolding the segmented cores into a straight line state during the winding process, making the winding process smoother and allowing more coils to be filled into the slots. However, this method of using segmented cores can lead to a decrease in motor efficiency, as the segmentation of the core can affect the energy efficiency performance of the motor. Therefore, how to maximize motor efficiency without sacrificing motor performance has become a problem that needs to be further studied.

[0041] The utility model provides a motor 100, aim at solving how to maximize motor efficiency under the premise of not sacrificing motor performance.

[0042] Please refer to Figures 2 to 5 In the utility model embodiment, the motor 100 includes stator assembly 1 and rotor 2, the stator assembly 1 includes stator 11, insulating layer 12 and multiple windings 13, the stator 11 has multiple wire grooves a that are spaced apart along its circumferential direction, the insulating layer 12 is arranged on the inner wall of the wire groove a, the stator 11 includes multiple stator units 10 that are spaced apart in its circumferential direction, the stator unit 10 includes yoke part 101, tooth part 102 and boot part 103, the tooth part 102 is arranged on the radially inner side of the yoke part 101, the boot part 103 is arranged on the end of the tooth part 102 away from the yoke part 101, the wire groove a is formed between the adjacent two tooth parts 102, and the winding 13 is wound on the corresponding tooth part 102;The rotor 2 is located on the radially inner side of the stator assembly 1;Wherein, the cross-sectional area of the wire groove a is S1 (mm 2 ), the cross-sectional area of the insulating layer 12 is S2 (mm 2 ), the outer diameter of each turn of wire of each winding 13 is D (mm), the total number of turns of the winding 13 in each wire groove a is N, the maximum speed of the motor 100 is Nmax (rps), 0.7<=NxD 2 / (S1-S2) <=0.95, and 125rps <=Nmax <=165rps.

[0043] It should be noted that, in order to improve the performance of the motor 100, it is necessary to improve the slot fill factor of the stator assembly 1 of the motor 100, the slot fill factor refers to the filling degree of the copper wire in the stator 11 slot, and higher slot fill factor generally means better motor efficiency, because more copper wire means stronger current and larger magnetic field. In the related art, the winding method of the winding 13 includes needle winding and flying fork winding. However, due to the size limitation of the winding needle, it is required to reserve a certain wire passing space for the slot opening and the phase-to-phase, which is an important factor limiting the improvement of the slot fill factor. The flying fork winding does not have a winding needle, but it is generally only suitable for the outer winding of the whole round stator 11 or straight strip stator 11, and the wire entering the slot is not high in precision.

[0044] The utility model discloses a plurality of stator units 10 are arranged along the circumferential direction of stator 11, and each stator unit 10 is composed of a plurality of stator 11 laminations arranged along the axial direction of stator 11. Each stator unit 10 has a stator 11 yoke and a stator 11 tooth. When winding is needed, the plurality of stator units 10 are disassembled, and the stator units 10 are fixed by a fixing tool. Then, the enameled wire is wound on the stator 11 tooth of the corresponding stator unit 10, which is not restricted by other stator units 10. Thus, the slot fill factor is increased. After the plurality of stator units 10 are wound, the plurality of stator units 10 with windings 13 are spliced again to form a whole stator 11.

[0045] It should be further noted that when the stator unit 10 is processed, a plurality of laminations (silicon steel sheets) are stacked, and the whole stator 111 connected by the plurality of stator units 10 is punched from the plurality of silicon steel sheets by using a whole split punching technology.

[0046] It should be noted that in the formula N×D 2 / (S1-S2), S1 represents the cross-sectional area of the winding slot a, the winding slot a refers to the area enclosed by the yoke portion 101 and the shoe portion 103 between the two adjacent tooth portions 102; S2 represents the total area occupied by the thickness of the insulation layer 12. Then, S1-S2 represents the area that can actually be used for winding the conductor of the winding 13. The total number of turns of the winding 13 in each winding slot a is N, and the outer diameter of each turn of the winding 13 is D. Since the conductor is circular, the cross-sectional area of each conductor is π×(D / 2) 2 , that is, πD 2 / 4. Then, N×D 2 represents the area occupied by the winding 13 in the winding slot a, including the gap between the conductors. It can be understood that N×D 2 is a theoretical and simplified representation. Therefore, the ratio N×D 2 / (S1-S2) represents the filling rate of the winding slot a.

[0047] When the parameter of the motor 100 is set to N×D 2 / (S1-S2) and the value is set to be greater than the lower limit of 0.7, it is ensured that the filling rate of the winding slot a is high enough to reduce the gap between the conductors and improve the space utilization. High filling rate can reduce the resistance of the winding 13, reduce copper loss, and thus improve the efficiency.

[0048] When the parameter of the motor 100 is set to N×D 2Setting the value of / (S1-S2) to less than the upper limit of 0.95 can prevent excessive fill rate from causing winding difficulties or insulation layer 12 failure due to pressure. Because excessive fill rate may cause local short circuit risk, and the close arrangement of conductors will increase eddy current loss (especially at high speed), which will reduce efficiency.

[0049] In summary, by using N×D 2 The ratio (S1-S2) is controlled between 0.7 and 0.95 to ensure that the slot fill rate is high enough to improve coil utilization and reduce resistance loss. At the same time, it avoids excessive fill rate, which may lead to winding difficulties, insulation problems or increased eddy current loss. This improves the fill rate without sacrificing efficiency.

[0050] "The maximum speed of the motor 100 is Nmax, 125rps≤Nmax≤165rps." It is understandable that high speed will lead to higher iron loss (eddy current and hysteresis loss) and mechanical stress, while lower speed may require greater torque. Setting Nmax to be greater than or equal to the lower limit of 125rps ensures that the output power of the motor 100 meets the basic requirements and avoids low efficiency due to insufficient torque at low speeds.

[0051] Setting Nmax below the upper limit of 165 rps limits the sharp rise in iron loss and mechanical loss, preventing excessive temperature rise from damaging insulation or magnetic properties.

[0052] The technical solution of this utility model is achieved by using N×D 2 The ratio (S1-S2) is controlled between 0.7 and 0.95. This ensures a sufficiently high filling rate, improves slot utilization, reduces resistance, and increases efficiency, while also avoiding winding difficulties caused by excessive filling rate. The maximum speed of motor 100 is controlled between 125 rpm and 165 rpm. By increasing the motor speed of compressor 200, the same cooling capacity can be achieved. The displacement of compressor 200 decreases, thereby reducing the current of compressor 200 and reducing the winding loss of motor 100, thus improving energy efficiency. This addresses how to maximize motor efficiency without sacrificing the performance of motor 100.

[0053] Figure 6 The relationship between the compressor energy efficiency (COP) and process problem rate provided by this utility model and N×D2 / (S1-S2) is shown. Figure 6 It can be seen that in N×D 2 When / (S1-S2) is controlled between 0.7 and 0.95, the process defect rate of the motor is at a low level, while the energy efficiency COP of the compressor reaches a high level.

[0054] Figure 7 The present invention relates the compressor motor efficiency and wear yield under extreme conditions to the relationship between speed.Figure 7 It can be seen that when the rotational speed of the motor is in the range of 125 rps to 165 rps, the motor efficiency of the compressor is at a high level while the limit condition wear rate is at a low level.

[0055] Further, please refer to Figures 2 to 3 In this embodiment, the outer diameter of the stator 11 is Do (mm), and the inner diameter is Di (mm), and 0.5≤Di / Do≤0.6.

[0056] It should be noted that the inner diameter Di of the stator 11 corresponds to the position of the rotor 2, and the outer diameter Do is the outer diameter of the entire stator 11. Di / Do affects the size ratio of the yoke part 101 and the tooth part 102 of the stator 11, and further affects the magnetic resistance and magnetic flux distribution of the magnetic circuit.

[0057] If Di / Do is too small, i.e., less than 0.5, it means that the inner diameter Di of the stator 11 is small, i.e., the outer diameter of the rotor 2 is small, which reduces the volume of the permanent magnet that can be installed on the surface or inside of the rotor 2, and the amount of magnet is low. Reducing the amount of magnet will directly weaken the magnetic field strength of the rotor 2, and further reduce the electromagnetic torque of the motor 100, which will cause the motor 100 to be insufficient in output, and it is difficult to meet the high load demand (such as compressor 200 startup or heavy load operation). The torque needs to be compensated by increasing the current, which leads to an increase in copper loss and a decrease in efficiency.

[0058] If Di / Do is too large, i.e., greater than 0.6, it means that the inner diameter Di of the stator 11 is large, which causes the yoke part 101 of the stator 11 to be thin, and the length of the tooth part 102 to be shortened. The shortening of the tooth part 102 will compress the cross-sectional area S1 of the wire slot a, i.e., the slot fill rate N×D 2 / (S1-S2) approaches the upper limit 0.95, and the total number of turns N may still be insufficient. Reducing the number of turns requires thicker wires or higher currents to maintain power, which leads to an increase in resistance loss. And reducing the number of turns will reduce the magnetomotive force of the stator 11 winding 13, affecting the motor efficiency. The yoke part 101 may not be able to bear the magnetic flux, causing local saturation and a dramatic increase in iron loss (eddy current and hysteresis loss).

[0059] Setting Di / Do to be greater than or equal to 0.5 ensures that the diameter of the rotor 2 is large enough to accommodate sufficient magnet volume, maintain magnetic field strength, and avoid insufficient output.

[0060] Setting Di / Do to be less than or equal to 0.6 preserves sufficient wire slot a area to support reasonable number of turns N, avoiding excessive copper loss while ensuring sufficient magnetomotive force.

[0061] Therefore, by setting the value of Di / Do between 0.5 and 0.6, the yoke 101 is prevented from being too thin to cause magnetic saturation and increase in iron loss, while ensuring sufficient length of the tooth 102 to provide sufficient slot area to maintain high permeability, reduce iron loss, and thus improve motor efficiency, especially at high speed operation. At the same time, the length of the tooth 102 enables the winding 13 to be evenly distributed, reducing local hot spots and improving heat dissipation.

[0062] By limiting the rotational speed Nmax, the motor 100 can be ensured to operate in a high-efficiency speed range, avoiding increased loss due to excessively high speed, while the design of the stator 11 parameters ensures overall efficiency.

[0063] In combination with the above parameters, the speed range interacts with the number of turns of the winding 13, the size of the wire, and the size of the stator 11 to ensure that the efficiency and temperature rise of the motor 100 are within an acceptable range at high speed operation. For example, the number of turns N and the wire diameter D affect the resistance and inductance of the winding 13, which in turn affects the current and loss of the motor 100. The rotational speed is related to the output power and frequency of the motor 100, and the frequency affects the iron loss. Therefore, limiting Nmax to a range of 125 rps to 165 rps, in combination with the parameters of the winding 13 and the size of the stator 11, ensures that the motor 100 operates in a high-efficiency region.

[0064] Specifically, in the present embodiment, the axial height of the stator 11 is T (mm), and 0.23 ≤ T / Do ≤ 0.55.

[0065] It should be noted that the motor 100 is mainly applied to a rotary compressor 200, and the rotor 2 of the rotary compressor 200 is supported by a single-sided bearing (cantilever beam structure). The larger the axial length of the rotor 2 (related to the axial height T of the stator 11), the larger the inertia moment of the cantilever end, and the higher the bending stress of the bearing, which is prone to fatigue failure. The centrifugal force and electromagnetic excitation force of the rotor 2 can cause resonance, threatening the structural integrity. Therefore, the electromagnetic performance (output, loss) and mechanical reliability need to be balanced.

[0066] It can be understood that the axial height T of the stator 11 refers to the length of the stator 11 in the axial direction, that is, the thickness of the stator 11. Do is the outer diameter of the stator 11.

[0067] T / Do is the ratio of the axial height to the outer diameter, representing the balance between the axial load of the compressor 200 and the magnetic circuit efficiency.

[0068] When T / Do ≤ 0.55, the axial height T of the stator 11 is limited to prevent the rotor 2 from being too long in the axial direction, causing the inertia moment of the cantilever end to be too large, reducing the bending stress of the shaft and the vibration amplitude.

[0069] When T / Do≥0.23, the stator 11 magnetic circuit cross-sectional area (T* yoke 101 / tooth thickness) is ensured to avoid magnetic saturation and reduce iron loss.

[0070] When T / Do<0.23, the magnetic circuit cross-sectional area is insufficient, and the iron loss increases.

[0071] By restricting the ratio of Di / Do, the axial load and vibration of the cantilever beam structure of the rotary compressor 200 are controlled, the bearing life is prolonged, and the magnetic circuit cross-sectional area and slot space are optimized to reduce iron loss and copper loss.

[0072] Further, in the embodiment, the number of the tooth portions 102 is Z, and the number of poles of the motor 100 is P, Z / P=3 / 2, wherein Z is set to 9 or 12.

[0073] When the ratio of the number of slots Z of the stator 11 to the number of poles P of the rotor 2 is 3 / 2 (i.e. Z=1.5P), a fractional-slot winding 13 (such as 9-slot 6-pole or 12-slot 8-pole) can be formed. The fractional-slot design makes the magnetic field asymmetrically distributed, which can significantly reduce the cogging torque and electromagnetic harmonics, thereby reducing vibration and noise.

[0074] When the slot-pole number is too low, such as Z / P<3 / 2, the number of poles is small, the magnetic flux alternation frequency is low, and the iron loss is small. When the slot number and the pole number are close (such as 6-slot 4-pole), the periodic alignment of the magnetic field causes significant torque pulsation, which causes mechanical vibration and noise. Low-order harmonics (such as 5th and 7th) are easy to resonate with the mechanical structure inherent frequency, producing whistling.

[0075] When Z / P>3 / 2, the number of poles is too large (such as 12-pole), the electrical frequency increases linearly with the speed. If high rotation needs to be maintained, eddy current loss dominates at high frequency, the core heats up, and the efficiency decreases; and ordinary frequency converters are difficult to stabilize the output of high-frequency PWM waveforms, resulting in loss of control or reduced efficiency. At the same time, high slot numbers (such as 24-slot) require more sophisticated winding 13 processes, increasing manufacturing costs.

[0076] In the present application, when the motor 100 adopts 9-slot 6-pole, the 3rd harmonic is cancelled by the fractional slot, mainly retaining the 6th and higher harmonics, which have small amplitude and are far from the mechanical resonance region. The 6-pole design has fe=150Hz at 3000RPM, and the silicon steel sheet loss is in the high efficiency interval (such as 0.8-1.2W / kg).

[0077] When 12-slot 8-pole is adopted, the 8-pole has fe=400Hz at 6000RPM, although the iron loss is high, but by using thin silicon steel sheets (such as 0.2mm) can effectively suppress eddy current.

[0078] Specifically, in the embodiment, two adjacent yoke portions 101 are welded.

[0079] Since the stator units 10 are independent after being formed, in order to ensure the stable connection between the plurality of stator units 10 after winding, the plurality of stator units 10 are spliced by welding.

[0080] Further, in the embodiment, the stator units 10 are arranged at two ends of the stator 11 in the circumferential direction, one end is provided with a positioning protrusion 104, and the other end is provided with a positioning groove 105, and the two adjacent stator units 10 are positioned and matched by the positioning protrusion 104 and the positioning groove 105.

[0081] In this way, the movement of each stator unit 10 in the radial direction of the stator 11 is restricted, the position of each stator unit 10 in the radial direction of the stator 11 is ensured, the installation accuracy of the plurality of stator units 10 before and after assembly is ensured, and the stable operation of the motor 100 at high speed is facilitated.

[0082] Further, the positioning protrusion 104 and the positioning groove 105 are in interference fit.

[0083] It can be understood that after the plurality of stator units 10 are spliced into a whole circle, due to the interference fit between the positioning protrusion 104 and the positioning groove 105, there is a pre-tightening force between each two adjacent stator units 10, so that each stator unit 10 is positioned at a predetermined position in the circumferential direction.

[0084] Specifically, in the embodiment, the yoke portion 101 has two yoke segments 1011 which are separately arranged on both sides of the tooth portion 102, and the included angle formed between the tooth portion 102 and the two yoke segments 1011 is θ, and 80°≤θ≤100°.

[0085] In this way, the included angle between the tooth portion 102 and the two yoke segments 1011 is set to be greater than 80°, which can avoid the winding slot a being too flat, resulting in uneven coil accumulation or space waste.

[0086] The included angle between the tooth portion 102 and the two yoke segments 1011 is set to be less than 100°, which can prevent the yoke segment 1011 from being too large in spacing, increase the magnetic resistance, and affect the efficiency of the magnetic circuit.

[0087] In this way, θ is set to be about 90°, so as to maximize the advantages of the multiple winding wires 13 in the winding slot a of the split stator unit 10, the wire arrangement is more orderly, the number of windings 13 in the slot is also increased accordingly, more turns or thicker wires can be accommodated, the current carrying capacity and torque density are improved, the winding 13 filling rate is improved while the performance of the motor 100 is ensured, and it is suitable for high power density and low loss application scenarios.

[0088] The utility model also proposes a kind of compressor 200, please refer to Figure 1 The compressor 200 includes cylinder and motor 100, the specific structure of motor 100 refers to above-mentioned embodiment, since the compressor 200 of the utility model adopts all technical solutions of above-mentioned all embodiments, at least has all beneficial effects brought by the technical scheme of above-mentioned embodiment, here no longer tediously repeat one by one.

[0089] The utility model also proposes a kind of refrigeration equipment, and the refrigeration equipment includes heat exchanger and compressor 200, the specific structure of compressor 200 refers to above-mentioned embodiment, since the refrigeration equipment of the utility model adopts all technical solutions of above-mentioned all embodiments, at least has all beneficial effects brought by the technical scheme of above-mentioned embodiment, here no longer tediously repeat one by one.

[0090] The refrigeration equipment can be refrigerator, air conditioner or water dispenser, and in a specific embodiment, the refrigeration equipment includes air conditioner.

[0091] By optimizing the internal structure of the motor 100, the slot fill factor of the winding 13 is improved, and the inner and outer diameter ratio of the stator 11 is reasonably set, so that the energy efficiency of the motor 100 can be significantly improved. Under the same input power, the motor 100 can be more efficiently converted into mechanical energy or refrigeration / heating capacity, thereby reducing the overall energy consumption of the air conditioner. By optimizing the size parameters (such as the inner and outer diameter ratio of the stator 11) of the motor 100, the volume and weight of the motor 100 can be reduced while ensuring performance. For air conditioners, the air conditioner is more compact and lightweight, making it easier to install and layout. The motor 100 optimizes electromagnetic performance, reduces unnecessary vibration and noise, and provides a quieter operating environment.

[0092] The above is only an exemplary embodiment of the utility model, and does not limit the patent scope of the utility model, and any equivalent structural transformation made by using the utility model specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the utility model.

Claims

1. An electric machine characterized in that, Comprise: A stator assembly comprising a stator, an insulation layer and a plurality of windings, the stator having a plurality of wire slots arranged at intervals in the circumferential direction thereof, the insulation layer being arranged on the inner wall of the wire slots, the stator comprising a plurality of stator units arranged at intervals in the circumferential direction thereof, the stator unit comprising a yoke portion, a tooth portion and a shoe portion, the tooth portion being arranged radially inward of the yoke portion, the shoe portion being arranged at one end of the tooth portion away from the yoke portion, the wire slot being formed between two adjacent tooth portions, the winding being wound around the corresponding tooth portion; and A rotor located radially inward of the stator assembly; wherein a cross-sectional area of the wire slot is S1 (mm 2 ), a cross-sectional area of the insulation layer is S2 (mm 2 ), an outer diameter of each turn of wire of each winding is D (mm), a total number of turns of the winding in each wire slot is N, a maximum rotational speed of the motor is Nmax (rps), 0.7 ≤ N × D 2 / (S1-S2) ≤ 0.95, and 125 rps ≤ Nmax ≤ 165 rps.

2. The electric machine of claim 1, wherein, The outer diameter of the stator is Do (mm), the inner diameter is Di (mm), and 0.5≤Di / Do≤0.

6.

3. The electric machine of claim 1, wherein, The axial height of the stator is T (mm), and 0.23≤T / Do≤0.

55.

4. The electric machine of claim 1, wherein, The number of tooth portions is Z, and the number of poles of the motor is P, Z / P=3 / 2, wherein Z is set to 9 or 12.

5. The electric machine of claim 1, wherein, Two adjacent yoke portions are welded.

6. The electric machine of claim 1, wherein, The stator unit is at both ends in the circumferential direction of the stator, one end is provided with a positioning protrusion, the other end is provided with a positioning groove, and two adjacent stator units are positioned and matched by the positioning protrusion and the positioning groove.

7. The electric machine of claim 6, wherein, The positioning protrusion and the positioning groove are interference fit.

8. The electric machine of claim 1, wherein, The yoke portion has two yoke segments arranged on both sides of the tooth portion, the included angle between the tooth portion and the two yoke segments is θ, and 80°≤θ≤100°.

9. A compressor characterized by, The motor comprises any one of claims 1 to 8.

10. A refrigeration appliance characterized in that, The compressor comprises claim 9.

11. The refrigeration appliance of claim 10, wherein, The refrigeration equipment comprises an air conditioner.

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