Motor, compressor and air conditioner

Abstract

The invention discloses a motor, a compressor and an air conditioner, the motor comprises a stator and a rotor, the stator comprises a stator yoke part and a plurality of stator teeth arranged on the inner side of the stator yoke part, a stator slot is formed between two adjacent stator teeth, the area of the stator slot is S, the inner diameter of the stator is D, and the number of the stator slots is Z; the rotor is rotatably arranged in the stator, the rotor is provided with magnet grooves, the number of the magnet grooves is N, the width of the magnet grooves is h, and the number of poles of the rotor is P; wherein the area S of the stator slots meets the relation that 100 * S / (Z * P * N * h * D) is larger than or equal to 0.82 and smaller than or equal to 1.08. According to the technical scheme, the area of the stator slots is limited through reasonable ratio setting, the split ratio of the stator can be increased, the back electromotive force of the motor is improved, the copper consumption of the motor can be obviously reduced, and the thermal load of the motor is reduced.

Description

Technical Field

[0001] The invention relates to the field of motors, and in particular to a motor, a compressor and an air conditioner. Background Art

[0002] With the progress of society and the increasingly severe energy situation, energy conservation and environmental protection have become the two major themes of the refrigeration industry. The compressor is the core component of refrigeration equipment such as refrigerators and air conditioners, and the motor is the power output component of the compressor. The efficiency of the motor will directly affect the energy efficiency of refrigeration equipment such as refrigerators and air conditioners. When designing a motor, optimizing the size of the motor's stator and setting the size of the stator within the optimal range can significantly improve the efficiency of the compressor. Therefore, how to optimize the size parameters of the motor's stator to improve the motor's efficiency is a problem that technicians in this field currently need to solve. Summary of the invention

[0003] The main purpose of the present invention is to provide a motor which adopts a reasonable ratio setting, can improve the stator split ratio, enhance the back electromotive force of the motor, and can significantly reduce the copper loss of the motor and reduce the thermal load of the motor.

[0004] To achieve the above object, the present invention provides a motor, comprising: A stator, comprising a stator yoke, and a plurality of stator teeth arranged inside the stator yoke, wherein a stator slot is formed between two adjacent stator teeth, the area of ​​the stator slot is S, the inner diameter of the stator is D, and the number of the stator slots is Z; and A rotor is rotatably disposed in the stator, the rotor is provided with magnet slots, the number of the magnet slots is N, the width of the magnet slots is h, and the number of poles of the rotor is P; The area S of the stator slot satisfies the relationship: 0.82≤100*S / (Z*P*N*h*D)≤1.08.

[0005] Optionally, the inner diameter D of the stator satisfies: 53mm≤D≤71mm.

[0006] Optionally, the area of ​​the stator slot satisfies: 125mm2≤S≤235mm2.

[0007] Optionally, a width h of the magnet slot satisfies 1.5 mm ≤ h ≤ 2.1 mm.

[0008] Optionally, the number Z of the stator slots and the number P of the rotor poles satisfy: Z / P=3 / 2.

[0009] Optionally, the motor further includes a permanent magnet, which is disposed in the magnet slot, and the thickness of the permanent magnet is hm, 0.05mm≤h-hm≤0.15mm.

[0010] Optionally, the rotor is further provided with an axial hole, and a center line of the axial hole coincides with the axis line of the rotor.

[0011] Optionally, the rotor is further provided with a plurality of weight-reducing holes, and the plurality of weight-reducing holes are arranged around the shaft hole.

[0012] The present invention also provides a compressor, comprising the motor as described above.

[0013] The present invention also provides an air conditioner, comprising the compressor as described above.

[0014] The technical solution of the present invention adopts a stator and a rotor, wherein the stator includes a stator yoke and a plurality of stator teeth arranged on the inner side of the stator yoke, a stator slot is formed between two adjacent stator teeth, the area of ​​the stator slot is S, the inner diameter of the stator is D, and the number of slots of the stator slot is Z; the rotor is rotatably arranged in the stator, the rotor is provided with magnet slots, the number of slots of the magnet slots is N, the width of the magnet slots is h, and the number of poles of the rotor is P; wherein the area S of the stator slots satisfies the relationship: 0.82≤100*S / (Z*P*N*h*D)≤1.08. By associating the area of ​​the stator slot, the inner diameter of the stator, the number of stator slots, the number of magnet slots, the width of the magnet slots and the number of poles of the rotor, the slot shape, size and other factors of the stator slot are rationally and efficiently set, thereby ensuring that motors of different sizes can reduce the iron loss of the motor without increasing the copper loss of the motor, thereby improving the energy loss and consumption during the operation of the permanent magnet synchronous motor, that is, while increasing the stator slot area, reducing the iron loss, and improving the output power of the permanent magnet synchronous motor. Through reasonable ratio setting, the stator crack ratio can be increased, the back electromotive force of the motor can be improved, and the copper loss of the motor and the thermal load of the motor can be significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 The figure is a schematic structural diagram of a stator and a rotor in a motor according to an embodiment of the present invention.

[0017] Description of Figure Numbers:

[0018] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] With the progress of society and the increasingly severe energy situation, energy conservation and environmental protection have become the two major themes of the refrigeration industry. The compressor is the core component of refrigeration equipment such as refrigerators and air conditioners, and the motor is the power output component of the compressor. The efficiency of the motor will directly affect the energy efficiency of refrigeration equipment such as refrigerators and air conditioners. When designing a motor, optimizing the size of the motor's stator and setting the size of the stator within the optimal range can significantly improve the efficiency of the compressor. Therefore, how to optimize the size parameters of the motor's stator to improve the motor's efficiency is a problem that technicians in this field currently need to solve.

[0024] To this end, the present invention proposes a motor which adopts a reasonable ratio setting to improve the stator split ratio, enhance the back electromotive force of the motor, and significantly reduce the copper loss of the motor and reduce the thermal load of the motor.

[0025] In one embodiment of the present invention, Figure 1 As shown, the motor includes a stator 100 and a rotor 200, the stator 100 includes a stator yoke 110, a plurality of stator teeth 120 arranged on the inner side of the stator yoke 110, a stator slot 130 is formed between two adjacent stator teeth 120, the area of ​​the stator slot 130 is S, the inner diameter of the stator 100 is D, and the number of slots of the stator slot 130 is Z; the rotor 200 is rotatably arranged in the stator 100, the rotor 200 is provided with magnet slots 210, the number of slots of the magnet slots 210 is N, the width of the magnet slots 210 is h, and the number of poles of the rotor 200 is P; wherein, the area S of the stator slot 130 satisfies the relationship: 0.82≤100*S / (Z*P*N*h*D)≤1.08.

[0026] The technology of electric motors, especially the technology of permanent magnet synchronous motors, has developed rapidly. The design of the motor body structure has become increasingly novel, and it has also developed in the direction of smaller size, greater output power and higher efficiency. When designing the stator slot 130 of the permanent magnet synchronous motor, it is necessary to rationalize and efficiently set the slot shape, size and other factors of the stator slot 130. With respect to the slot shape of the stator slot 130, when the size is specific, the size of the area of ​​the stator slot 130 is greatly related to the size of the stator teeth 120 and the stator yoke 110. Different sizes of the stator teeth 120 and the stator yoke 110 will form different areas of the stator slot 130. Usually, the area of ​​the stator slot 130 is also large, and the larger the effective slot surface, the more turns of the stator winding, thereby improving the efficiency of the permanent magnet synchronous motor. However, when the area of ​​the stator slot 130 is too large, and the size of the stator teeth 120 and the stator yoke 110 is small, it will lead to an increase in the permanent magnet synchronous iron loss, thereby affecting the working efficiency of the motor.

[0027] By associating the area of ​​the stator slot 130, the inner diameter of the stator 100, the number of slots of the stator slot 130, the number of slots of the magnet slot, the width of the magnet slot 210 and the number of poles of the rotor 200, the slot shape, size and other factors of the stator slot 130 are rationalized and efficiently set, thereby ensuring that motors of different sizes can reduce the iron loss of the motor without increasing the copper loss of the motor, thereby improving the energy loss and consumption during the operation of the permanent magnet synchronous motor, that is, while increasing the area of ​​the stator slot 130, reducing the iron loss, and improving the output power of the permanent magnet synchronous motor. By setting a reasonable ratio, the split ratio of the stator 100 can be increased, the back electromotive force of the motor can be improved, and the copper loss of the motor and the thermal load of the motor can be significantly reduced.

[0028] Different numbers of stator slots 130 and different sizes of stator teeth 120 can form different areas of stator slots 130. The areas of stator slots 130 determine different coil forms, which affects the copper loss of the motor. The stator 100 is matched with the rotor 200. The area and number of stator slots 130 also affect the rotor 200. The larger area of ​​stator slots 130 leads to an increase in magnetic flux density in the motor stator 100, which can appropriately reduce copper loss, but at the same time it will also cause an increase in iron loss, thereby affecting the performance of the motor. Therefore, it is necessary to comprehensively balance the copper loss and iron loss of the motor according to the size of each component of the stator 100 so that the efficiency of the motor reaches the optimal value.

[0029] By setting a reasonable ratio, that is, 0.82≤100*S / (Z*P*N*h*D)≤1.08. Within this range, the stator split ratio can be increased by 100, the back electromotive force of the motor can be increased, and the copper loss and thermal load of the motor can be significantly reduced.

[0030] Furthermore, the size of the motor should be considered in a comprehensive manner with regard to specific application requirements. Too small or too large will increase production costs. The inner diameter D of the stator 100 satisfies: 53 mm ≤ D ≤ 71 mm.

[0031] In addition, by limiting the inner diameter D of the stator 100, the corresponding outer diameter of the rotor 200 is determined, and the split ratio of the stator 100 is also determined accordingly. As we all know, the output torque of the motor is proportional to the volume of the motor. Therefore, in the initial stage of motor design, the motor frame number is given priority to determine the outer diameter size and axial length of the motor. Determining the external dimensions of the motor is only the first step, and the internal electromagnetic design of the motor should not be underestimated. In addition to the pole slot matching and air gap length, there is another key design parameter, which is the split ratio of the motor.

[0032] The split ratio of a motor refers to the ratio of the inner diameter to the outer diameter of the motor stator 100.

[0033] The optimization of the split ratio generally refers to a measure to improve the motor performance and reduce the production cost by changing the inner diameter of the stator 100 under the condition that the outer diameter of the stator 100 is determined. As the split ratio increases, the two most significant changes are the increase in the air gap diameter (increase in the motor pole pitch) and the reduction in the area of ​​the stator slot 130.

[0034] The increase in the air gap diameter will increase the torque of the motor. On the other hand, the increase in the motor pole pitch can be understood as, under the condition of a fixed pole arc coefficient, the amount of permanent magnet used per pole increases, and the magnetic flux per pole also increases accordingly. According to the most well-known no-load back EMF formula. First, the inner diameter of the stator 100 increases, and the most intuitive change is that the total area of ​​the circular ring of the stator 100 decreases. Secondly, the magnetic flux per pole increases. In order to prevent saturation, the width of the stator teeth 120 and the yoke will increase, leaving even less area for the stator slots 130. In order to ensure that the winding is smoothly offline, the slot fill rate of the motor must be controlled below a certain value (such as 80%), so the total copper usage of the entire motor winding will decrease.

[0035] Furthermore, the number Z of the stator slots 130 and the number P of the poles of the rotor 200 satisfy: Z / P=3 / 2.

[0036] The maximum power density of the motor is also increasing, and the split ratio that reaches the maximum power density is also increasing. The torque density of the motor can be increased by increasing the number of pole pairs of the motor. However, as the number of pole pairs increases, when the pole arc coefficient is constant, the inter-pole leakage between two adjacent magnetic poles becomes heavier, which will reduce the electromagnetic torque. The torque density of the motor is ensured by limiting the number of slots Z of the stator slot 130 and the number of poles P of the rotor 200.

[0037] It should be noted that the number of slots of the stator slots 130 represents the distribution of the stator winding, and the number of poles of the rotor 200 represents the number of magnetic poles on the rotor 200. The number of slots of the motor and the number of poles of the rotor 200 are two important parameters in the motor design, and their selection will directly affect the performance and characteristics of the motor.

[0038] Specifically, the width h of the magnet slot 210 satisfies 1.5 mm ≤ h ≤ 2.1 mm.

[0039] Ensure the magnetic field distribution and force-bearing area of ​​the stator 100 and the rotor 200 to ensure the output power of the motor.

[0040] Specifically, the area of ​​the stator slot 130 satisfies: 125 mm2≤S≤235 mm2.

[0041] When S is less than 125mm2, the magnetic field distribution and force area of ​​the motor are reduced, the number of slots in the stator slot 130 and the number of poles in the rotor 200 are reduced accordingly, and the output power at the same size volume is reduced. A higher number of slots and poles can improve the smoothness of the movement of the motor's rotor 200, reduce the pulsation force and vibration of the rotor 200, and thus reduce the noise level of the motor. Therefore, the noise problem may be relatively prominent.

[0042] When S is greater than 235 mm2, although the area of ​​the stator slot 130 is larger, the slot fill rate is higher, and the power density of the motor is improved, thereby improving the output capacity of the motor, this also leads to a reduction in the width of the stator teeth 120 and the stator yoke 110, and the overall stability of the stator 100 is reduced, thereby affecting the service life of the motor.

[0043] By setting a reasonable ratio, the split ratio of the stator 100 can be improved, the back electromotive force of the motor can be improved, the copper loss of the motor can be significantly reduced, and the thermal load of the motor can be reduced. In this way, ensuring that the motor has a higher number of slots and poles can improve the smoothness of the motor's rotor 200 movement, reduce the pulsation force and vibration of the rotor 200, and thus reduce the noise level of the motor. And the proper selection of the number of slots and the number of poles can improve the efficiency of the motor. Generally, a higher number of slots and a lower number of poles can improve the efficiency of the motor. This is because a higher number of slots can increase the copper loss and iron loss ratio of the motor, while a lower number of poles can reduce the rotational inertia and mechanical loss of the motor, thereby improving the overall efficiency of the motor.

[0044] In another embodiment, the width of the magnet slot can be determined by the thickness of the permanent magnet.

[0045] Specifically, the motor further includes a permanent magnet, which is disposed in the magnet slot 210 , and the thickness of the permanent magnet is hm, 0.05 mm≤h-hm≤0.15 mm.

[0046] During the design process, the size of the permanent magnet is usually determined. During the corresponding processing process, the width of the magnet slot for placing the permanent magnet is confirmed. The permanent magnet is placed in the magnet slot 210. The thickness of the permanent magnet and the width of the magnet slot are usually in the range of 0.05mm≤h-hm≤0.15mm. This can ensure that the permanent magnet can be accommodated and the stability of the permanent magnet can be guaranteed. In this way, the area of ​​the sub-slot 130 can be determined by the width of the magnet slot 210 of the rotor 200, and the area of ​​the stator slot 130 can also be determined by the thickness of the permanent magnet.

[0047] Specifically, the rotor 200 is further provided with an axial hole 220, the center line of which coincides with the axis of the rotor 200. The stator 100 is rotatably disposed in the stator 100, and the center line of which coincides with the axis of the rotor 200, thereby ensuring the stability of the output of the motor.

[0048] Furthermore, the rotor 200 is also provided with a plurality of weight-reducing holes 230, and the plurality of weight-reducing holes 230 are arranged around the shaft hole 220. By opening the weight-reducing holes 230 on the core of the rotor 200, the material usage of the rotor 200 can be reduced, thereby reducing the mass of the rotor 200. The reduction in the mass of the rotor 200 can effectively reduce the inertia of the rotor 200, so that the motor can accelerate, decelerate or change direction more quickly. The reduction in the mass of the rotor 200 can reduce the moment of inertia of the rotor 200, so that the motor can respond to external speed change requirements more quickly. This is of great significance for certain application scenarios that require frequent speed adjustment, such as servo systems and electric vehicles. The weight-reducing design of the rotor 200 can reduce the unbalanced mass of the rotor 200 and prevent the occurrence of dynamic unbalance. Dynamic unbalance can cause vibration and noise in the motor when it rotates at high speed, and may have an adverse effect on the safety and life of the motor. Through the design of the weight-reducing holes 230, the unbalanced mass of the rotor 200 can be effectively reduced, and the risk of dynamic unbalance can be reduced. The arrangement of the weight-reducing holes 230 needs to be carried out under the premise of ensuring the structural strength and rigidity of the rotor 200. Excessive or improperly located weight-reducing holes 230 may damage the structural integrity and stability of the rotor 200, and even have a negative impact on the performance of the motor. Therefore, multiple weight-reducing holes 230 are arranged around the shaft hole 220, and multiple weight-reducing holes 230 are waist-shaped. Reasonable structural analysis and optimization of distribution positions ensure that the arrangement of the weight-reducing holes 230 meets the motor design requirements.

[0049] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above-mentioned embodiment. Since the compressor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0050] The present invention further proposes an air conditioner, comprising a compressor as described above. Since the air conditioner adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0051] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A motor, characterized in that: include: A stator, comprising a stator yoke, and a plurality of stator teeth arranged inside the stator yoke, wherein a stator slot is formed between two adjacent stator teeth, the area of ​​the stator slot is S, the inner diameter of the stator is D, and the number of the stator slots is Z; and A rotor is rotatably disposed in the stator, the rotor is provided with magnet slots, the number of the magnet slots is N, the width of the magnet slots is h, and the number of poles of the rotor is P; The area S of the stator slot satisfies the relationship: 0.82≤100*S / (Z*P*N*h*D)≤1.

08.

2. The motor according to claim 1, characterized in that The inner diameter D of the stator satisfies: 53 mm ≤ D ≤ 71 mm.

3. The motor according to claim 1, characterized in that The area of ​​the stator slot satisfies: 125mm2≤S≤235mm2.

4. The motor according to claim 1, characterized in that The width h of the magnet slot satisfies, 1.5 mm ≤ h ≤ 2.1 mm.

5. The motor according to claim 1, characterized in that The number Z of the stator slots and the number P of the rotor poles satisfy: Z / P=3 / 2.

6. The motor according to claim 1, characterized in that The motor further includes a permanent magnet, which is disposed in the magnet slot, and the thickness of the permanent magnet is hm, 0.05 mm≤h-hm≤0.15 mm.

7. The motor according to claim 1, characterized in that The rotor is also provided with an axial hole, the center line of the axial hole coincides with the axis line of the rotor.

8. The motor according to claim 7, characterized in that The rotor is also provided with a plurality of weight-reducing holes, and the plurality of weight-reducing holes are arranged around the shaft hole.

9. A compressor, characterized in that: Comprising the electric machine as claimed in any one of claims 1 to 8.

10. An air conditioner, characterized in that: Comprising a compressor as claimed in claim 9.

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