Motor, compressor and refrigeration equipment
By coordinating the parameters of the permanent magnet and stator structure, a motor structure is designed, which solves the problem of unbalanced copper and iron consumption of traditional motors, and improves motor efficiency and compressor energy efficiency.
Patent Information
- Application Number
- CN202421748848.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-22
AI Technical Summary
Traditional motors fail to balance copper and iron consumption during design, resulting in low efficiency and affecting the energy efficiency of the compressor.
By coordinating the relationship between the width, thickness of the permanent magnet, the width of the stator teeth, and the thickness of the stator yoke, a motor structure is designed to balance copper and iron consumption.
The motor efficiency is improved, thereby improving the energy efficiency of the compressor and achieving a balance of copper and iron consumption.
Smart Images
Figure CN222928248U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of refrigeration equipment, and particularly relates to an electric motor, a compressor and a refrigeration equipment. Background Art
[0002] At present, the permanent magnet motor technology has been widely applied, especially in the field of compressors. However, the efficiency of the permanent magnet motor is an important index, which directly affects the efficiency of the compressor. In the motor, the sizes of the rotor permanent magnet, the stator teeth and the stator yoke are important factors affecting the motor efficiency. Copper loss and iron loss are the two main losses during the operation of the air compressor. Copper loss refers to the loss generated when the current passes through the coil and the coil generates resistance, and this loss is related to the coil resistance, the current magnitude and the frequency. Iron loss is caused by the energy loss generated by the eddy current and hysteresis nonlinear physical phenomena in the magnetic circuit during magnetization and demagnetization. The traditional motor structure does not consider the balance between copper loss and iron loss during design. Often, when one of them is reduced, the other one increases, and the purpose of high efficiency cannot be achieved. Summary of the Utility Model
[0003] The main object of the utility model is to provide an electric motor, a compressor and a refrigeration equipment, aiming to balance the copper and iron losses, improve the efficiency of the electric motor and improve the energy efficiency of the compressor.
[0004] To achieve the above object, the electric motor proposed by the utility model includes:
[0005] A stator, the stator includes a stator core, the stator core includes a stator yoke and stator teeth, the stator teeth are connected to the stator yoke, and the thickness of the stator yoke is W 1 , and the width of the stator teeth is W 2 ; and
[0006] A rotor, the rotor includes a rotor core and a permanent magnet, the rotor core is rotatably arranged in the stator core, a magnet slot is arranged on the rotor core, the permanent magnet is installed in the magnet slot, the width of the permanent magnet is W 3 , the thickness of the permanent magnet is t, the number of permanent magnets on each pole of the rotor is a, and 1.5 ≤ (a * W 3 * t) / (W 1 + W 2 ) ≤ 1.9.
[0007] In an embodiment, 2 < a * W 3 / W 2 < 3.5.
[0008] In an embodiment, when the magnetic circuit structure of the permanent magnet is in a straight shape, a = 1.
[0009] In one embodiment, when the magnetic circuit structure of the permanent magnet is V-shaped, a = 2.
[0010] In one embodiment, 0.8 < W 1 / W 2 < 1.5.
[0011] In one embodiment, 4.5 mm < W 1 < 8 mm.
[0012] In one embodiment, 4 mm < W 2 < 12 mm.
[0013] In one embodiment, 5 mm < W 3 < 25 mm.
[0014] In one embodiment, 0.5 mm < t < 2.5 mm.
[0015] In one embodiment, 1.2 mm < t < 2 mm.
[0016] In one embodiment, the stator teeth and the stator yoke enclose a stator slot. When the number of slots of the stator slot is 15 and the number of pole pairs of the rotor is 5, 1.3 mm < t < 1.5 mm.
[0017] In one embodiment, the magnetic poles of the permanent magnet are consistent with the radial direction of the rotor core.
[0018] In one embodiment, the stator teeth and the stator yoke enclose a stator slot, and the number of slots of the stator slot is Q, where 15 ≤ Q ≤ 18.
[0019] In one embodiment, the number of pole pairs of the rotor is P, where 5 ≤ P ≤ 6.
[0020] In one embodiment, the number of phases of the motor is m, and the number of slots per pole per phase of the motor is q, where q = Q / 2mP and q < 1.
[0021] The present utility model also provides a compressor, including the motor as described above.
[0022] The present utility model also provides a refrigeration device, including the compressor as described above.
[0023] The motor in the technical solution of the present utility model includes a stator and a rotor. The stator core includes a stator yoke and stator teeth. The stator teeth are connected to the stator yoke. The thickness of the stator yoke is W 1 , and the width of the stator teeth is W 2 , the rotor includes a rotor core and a permanent magnet. The rotor core is rotatably arranged inside the stator core. A magnet slot is provided on the rotor core, and the permanent magnet is installed in the magnet slot. The width of the permanent magnet is W 3, the thickness of the permanent magnet is t, and the number of permanent magnets on each pole of the rotor is a, where 1.5 ≤ (a * W 3 * t) / (W 1 + W 2 ) ≤ 1.9. The technical solution of the present utility model balances the copper and iron losses and improves the efficiency of the motor by coordinating the relationship between the width and thickness of the permanent magnet, the stator tooth width, and the stator yoke thickness, thereby improving the energy efficiency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.
[0025] Figure 1 It is a schematic structural diagram of an embodiment of the motor provided by the present utility model;
[0026] Figure 2 It is Figure 1 a partial enlarged view of part A in
[0027] Figure 3 It is Figure 1 a schematic structural diagram of another embodiment of the permanent magnet in
[0028] Figure 4 It is Figure 1 a schematic structural diagram of the rotor when the permanent magnet is in a V shape in
[0029] Figure 5 It is Figure 1 a schematic structural diagram of the rotor when the permanent magnet is in a U shape in
[0030] Figure 6 It is a comparison diagram of the copper loss, iron loss, and motor efficiency of the motor provided by the present utility model with those of the motor in the prior art;
[0031] Figure 7 It is for (a * W 3 * t) / (W 1 + W 2 ) an experimental data table of the calculated data and the corresponding motor efficiency;
[0032] Figure 8 It is a schematic diagram of the change of the motor efficiency with (a * W 3 * t) / (W 1 + W 2 );
[0033] Figure 9 It is for a * W3 / W 2 Calculation data of / W and experimental data table of corresponding iron loss
[0034] Figure 10 For the iron loss efficiency versus a*W 3 / W 2 Schematic diagram of the change
[0035] Figure 11 For W 1 / W 2 Calculation data of / W and experimental data table of corresponding stator slot area and motor efficiency
[0036] Figure 12 For the stator slot area and motor efficiency versus W 1 / W 2 Schematic diagram of the change with the value of / W
[0037] Explanation of the reference numerals in the drawings:
[0038] 10. Stator core; 11. Stator yoke; 12. Stator teeth; 13. Stator slots; 21. Rotor core; 211. Magnet slots; 22. Permanent magnet
[0039] The realization, functional features and advantages of the purpose of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings Detailed implementation manners
[0040] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model
[0041] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly
[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, such descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0043] Referring to Figure 1 、 Figure 3 and Figure 5 , the present utility model provides a motor, comprising:
[0044] A stator, the stator comprising a stator core 10, the stator core 10 comprising a stator yoke 11 and stator teeth 12, the stator teeth 12 being connected to the stator yoke 11, the thickness of the stator yoke 11 being W 1 , the width of the stator teeth 12 being W 2 ; and
[0045] A rotor, the rotor comprising a rotor core 21 and a permanent magnet 22, the rotor core 21 being rotatably disposed within the stator core 10, a magnet slot 211 being provided on the rotor core 21, the permanent magnet 22 being installed within the magnet slot 211, the width of the permanent magnet 22 being W 3 , the thickness of the permanent magnet 22 being t, the number of permanent magnets on each pole of the rotor being a, 1.5 ≤ (a * W 3 * t) / (W 1 + W 2 ) ≤ 1.9.
[0046] The motor in the technical solution of the present utility model comprises a stator and a rotor. The stator core 10 comprises a stator yoke 11 and stator teeth 12. The stator teeth 12 are connected to the stator yoke 11. The thickness of the stator yoke 11 is W 1 , the width of the stator teeth 12 is W 2 , the rotor comprises a rotor core 21 and a permanent magnet 22. The rotor core 21 is rotatably disposed within the stator core 10. A magnet slot 211 is provided on the rotor core 21. The permanent magnet 22 is installed within the magnet slot 211. The width of the permanent magnet 22 is W 3 , the thickness of the permanent magnet 22 is t, the number of permanent magnets on each pole of the rotor is a, 1.5 ≤ (a * W3 *t) / (W 1 +W 2 ) ≤ 1.9. The technical solution of the present utility model balances the copper and iron losses and improves the efficiency of the motor, and further improves the energy efficiency of the compressor by coordinating the relationship between the width and thickness of the permanent magnet, the width of the stator tooth 12, and the thickness of the stator yoke 11.
[0047] Furthermore, it should be noted that the thickness of the stator yoke is W 1 . Define the groove surface of the stator slot in the stator yoke part as the groove bottom. If the groove bottom is an irregular shape, the irregular shape can be a combination of multiple straight segments, or a single arc segment or a combination of multiple arc segments, or a combination of at least one straight segment and at least one arc segment, etc. At this time, the thickness W of the stator yoke 1 represents the minimum distance between the lowest point of the groove bottom and the outer peripheral surface of the stator yoke, where the lowest point of the groove bottom represents the point on the groove bottom that is farthest from the center of the circle. If the groove bottom is a single straight segment, that is, the groove bottom is flat (at this time, whether the corners between the groove bottom and the adjacent two groove walls are arc-shaped is not considered), at this time, define the shortest distance between the groove bottom and the center of the circle as b, and the outer diameter of the stator yoke as R. At this time, the thickness W of the stator yoke 1 = R / 2 - b.
[0048] Refer to Figure 2 and Figure 3 . Further, the thickness t of the permanent magnet is the distance between two parallel sides of the permanent magnet, and the width W of the permanent magnet 3 is the distance between two parallel sides. Therefore, when the corners of the permanent magnet are chamfered, it does not affect the width and thickness of the permanent magnet.
[0049] Among them, a*W 3 *t is the total area of the permanent magnet for each pole, and (a*W 3 *t) / (W 1 +W 2 ) is the distribution of the single-pole magnetic flux in the stator tooth 12 and the stator yoke 11. As Figure 2 when the permanent magnet is in a straight shape, a = 1, that is, a*W 3 *t = W 3 *t. As Figure 4 when the permanent magnet is in a V shape, a = 2, a*W 3 *t = 2W 3 *t, that is, the total area of the two permanent magnets arranged in a V shape; if the widths of the magnets in each pole are not equal, then W 3 is the total width of all the magnets in each pole. At this time, a = 1, W 3 = x + y. As Figure 5 when the permanent magnet is in a U shape, a = 3, 3*W 3 *t = 3W 3*t, i.e., the total area of the three permanent magnets arranged in a U shape; if the widths of the magnets within each pole are not equal, then W 3 is the sum of the widths of all the magnets in each pole. At this time, a = 1, and W 3 = x + y + z.
[0050] Refer to Figure 7 and Figure 8 , Figure 7 is the experimental data table of the calculation data of (a * W 3 * t) / (W 1 + W 2 ) and the corresponding motor efficiency. Figure 8 is the schematic diagram of the change of the motor efficiency with (a * W 3 * t) / (W 1 + W 2 ). It can be seen from Figure 7 and Figure 8 that when (a * W 3 * t) / (W 1 + W 2 ) ≤ 1.7, the motor efficiency increases with the increase of the value of (a * W 3 * t) / (W 1 + W 2 ); when (a * W 3 * t) / (W 1 + W 2 ) > 1.7, the motor efficiency decreases with the increase of the value of (a * W 3 * t) / (W 1 + W 2 ); due to the existence of production and processing errors, there will be differences in the actual values of each numerical value, and the motor efficiency can meet the actual requirements when it is above 93.2%. Therefore, in this embodiment, 1.5 ≤ (a * W 3 * t) / (W 1 + W 2 ) ≤ 1.9.
[0051] Among them, the permanent magnet 22 is made of rare earth materials. The permanent magnet 22 made of rare earth materials has the following advantages: 1. High-temperature stability: When the temperature of rare earth permanent magnet materials rises, the coefficient of the residual magnetic induction intensity changing with temperature can be made very small. At the same time, for some rare earth permanent magnet materials such as neodymium iron boron under appropriate processes, the Curie temperature can reach 850 °C, which ensures that they can still work normally at high temperatures. 2. Excellent magnetic properties: Rare earth permanent magnet materials have a high magnetic energy product, remanence, and high coercivity. For example, the magnetic energy product of the neodymium iron boron-based permanent magnet 22 is between 27 and 50 MGOe, which is currently the permanent magnet material with the highest magnetism. 3. Demagnetization curve characteristics: Compared with traditional permanent magnet materials, the demagnetization curve of rare earth materials is basically a straight line, and the demagnetization curve and the recovery curve basically coincide, which helps to achieve more stable performance in applications. 4. Wide range of application fields: Due to the excellent performance of rare earth permanent magnet materials, they have been widely used in many fields such as electric vehicles, artificial satellites, radars, micro-motors, aviation instruments, electronic watches, seismographs, etc.
[0052] In one embodiment, when the magnetic circuit structure of the permanent magnet 22 is in a straight line shape, a = 1, that is, at this time 1.5 ≤ (W 3 *t) / (W 1 +W 2 ) ≤ 1.9. In the straight-line magnetic circuit structure, the magnetic field distribution is relatively uniform, without obvious local magnetic field enhancement or weakening regions; the straight-line magnetic circuit structure makes the magnetic force lines flow in the same direction, so that the flow paths of the magnetic force lines inside and outside the permanent magnet 22 are relatively direct, without excessive bending or dispersion, so the magnetic flux efficiency is relatively high, which is conducive to realizing efficient energy conversion or transmission; at the same time, the structure of the straight-line permanent magnet 22 is simple, easy to manufacture and install. In the design and production process, the complexity of processing and assembly can be reduced, thereby improving production efficiency. The straight-line permanent magnet 22 can be widely used in various devices such as motors, generators, sensors, speakers, compressors, etc.
[0053] In another embodiment, when the magnetic circuit structure of the permanent magnet 22 is in a V shape, a = 2, that is, at this time 1.5 ≤ 2(W 3 *t) / (W 1 +W 2 ) ≤ 1.9. The V-shaped magnetic circuit structure has a magnetic focusing effect, which can make the magnetic field more concentrated, thereby enhancing the performance of the magnet. And the V-shaped structure helps to reduce the size and weight of the magnet, improving the efficiency and stability of the system; in modern devices that pursue compactness and light weight, this advantage is particularly important; at the same time, the V-shaped magnetic circuit structure has a larger magnetic resistance torque, which improves the performance and efficiency of the motor.
[0054] In one embodiment, 2 < a*W 3 / W 2<3.5. a is the number of permanent magnets 22 on each pole of the rotor, W 2 is the width of the stator tooth 12, W 3 is the width of the permanent magnet 22, a*W 3 / W 2 represents the relationship between the total width of the permanent magnets 22 on the rotor poles and the width of the stator teeth 12; if the width of the permanent magnets 22 is relatively large and the width of the stator teeth 12 is relatively small, the magnetic field of the permanent magnets 22 can be better utilized, thereby improving the output power and efficiency of the motor. However, the magnetic field distribution of the motor is uneven, resulting in noise and vibration problems. When the width of the stator teeth 12 is relatively large and the width of the permanent magnets 22 is relatively small, the magnetic field distribution of the motor is relatively uniform, reducing noise and vibration. However, the utilization rate of the permanent magnets 22 is relatively low, and the output power and efficiency of the motor will also be correspondingly reduced.
[0055] Refer to Figure 9 and Figure 10 , Figure 9 is a*W 3 / W 2 experimental data table of the calculated data of and the corresponding iron loss. Figure 10 is the schematic diagram of the change of the iron loss efficiency with a*W 3 / W 2 From Figure 9 and Figure 10 it can be seen that when a*W 3 / W 2 <3, the iron loss of the motor decreases with the increase of a*W 3 / W 2 ; when a*W 3 / W 2 >3, the iron loss of the motor increases with the increase of a*W 3 / W 2 ; when a*W 3 / W 2 =3, the iron loss of the motor is at the lowest value. Considering that there are certain errors in the actual processing process, and when 2 < a*W 3 / W 2 <3.5, the iron loss of the motor can be maintained within a relatively low range and can meet the requirements in actual work.
[0056] In one embodiment, 0.8 < W 1 / W 2 <1.5. W 1 is the thickness of the stator yoke 11, W 2 is the width of the stator tooth 12; by reasonably setting the width W 2 of the stator tooth 12 and the thickness W 1The size is changed, the area of the stator slots 13 on the stator is altered, the specifications of the motor coils are adjusted, thereby balancing the losses of the motor and enhancing the motor performance.
[0057] Refer to Figure 11 and Figure 12 , Figure 11 is W 1 / W 2 Experimental data table of the calculation data of / W corresponding to the area of the stator slots 13 and the motor efficiency. Figure 12 is the schematic diagram of the change of the area of the stator slots 13 and the motor efficiency with the value of W 1 / W 2 It can be seen from Figure 11 and Figure 12 that when W 1 / W 2 <1.15, the area of the stator slots 13 and the motor efficiency increase with the increase of W 1 / W 2 ; when W 1 / W 2 >1.15, the area of the stator slots 13 and the motor efficiency decrease with the increase of W 1 / W 2 ; when W 1 / W 2 =1.15, the area of the stator slots 13 and the motor efficiency are at the maximum value; however, when 0.8 < W 1 / W 2 < 1.5, the change of the area of the stator slots 13 is small, and both the area of the stator slots 13 and the motor efficiency are in a relatively high range and can meet the requirements in actual operation.
[0058] In one embodiment, 4.5 mm < W 1 < 8 mm. It can be understood that when the width of the stator yoke 11 increases, the area of the stator slots 13 will correspondingly decrease, resulting in a decrease in the number of parallel conductors and an increase in the phase resistance, and further leading to an increase in the copper loss of the motor; however, the increase in the width of the stator yoke 11 usually reduces the magnetic flux density in the stator tooth 12 part because the magnetic flux needs to be distributed in a wider area. The reduction of the magnetic flux density helps to reduce the iron loss. On the contrary, when the width of the stator yoke 11 decreases, the copper loss will be reduced while the iron loss will increase; therefore, in this embodiment, by reasonably setting the size of the stator yoke 11, the copper and iron losses of the motor are balanced, thereby improving the motor efficiency and the energy efficiency of the compressor.
[0059] In one embodiment, 4 mm < W 2<12 mm. Understandably, when the width of the stator tooth 12 increases, the decrease in magnetic flux density will reduce the iron loss under high-speed and low-torque conditions, because the decrease in the magnetic flux density in the stator tooth 12 part causes a significant decrease in the excitation current in the motor current, thereby reducing the iron loss; however, increasing the width of the stator tooth 12 will lead to a decrease in the space of the stator slot 13, a decrease in the number of parallel conductors, and an increase in the phase resistance, resulting in an increase in the copper loss of the motor; when the stator tooth 12 decreases, the space of the stator slot 13 increases, and the increase in the number of parallel conductors reduces the phase resistance and the copper loss; however, the decrease in the width of the stator tooth 12 may increase the saturation degree of the magnetic circuit of the stator core, resulting in an increase in the iron loss; therefore, in this embodiment, by reasonably setting the width of the stator tooth 12, the copper and iron losses of the motor are balanced, thereby improving the efficiency of the motor and the energy efficiency of the compressor.
[0060] In one embodiment, 5 mm < W 3 <25 mm. Understandably, if W 3 ≥25 mm, at this time the width of the permanent magnet 22 is relatively large. Although the magnetic field strength is relatively high at this time, it also increases the volume of the permanent magnet 22, thereby increasing the cost of the motor; if W 3 ≤5 mm, then the magnetic field strength may be difficult to meet the requirements of the motor. Therefore, in this embodiment, 5 mm < W 3 <25 mm, so as to reasonably set the width of the permanent magnet 22, thereby reducing the cost of the motor while also making the magnetic strength of the permanent magnet 22 meet the requirements of the motor.
[0061] In one embodiment, 0.5 mm < t < 2.5 mm. Understandably, if t ≥ 2.5 mm, that is, the thickness of the permanent magnet 22 is relatively thick at this time. Although the magnetic field strength of the permanent magnet 22 is relatively high at this time, it will also increase the volume of the permanent magnet 22, thereby increasing the cost of the motor; if t ≤ 0.5 mm, then the efficiency of the motor is improved and the energy efficiency of the compressor is improved. Therefore, in this embodiment, 0.5 mm < t < 2.5 mm, so as to reasonably set the thickness of the permanent magnet 22, thereby reducing the cost of the motor while also making the magnetic strength of the permanent magnet 22 meet the requirements of the motor.
[0062] Furthermore, when 1.2 mm < t < 2 mm, by further optimizing the thickness of the permanent magnet, the utilization rate of the magnet can reach a better level, thereby improving the efficiency of the motor and the energy efficiency of the compressor.
[0063] Further, the stator teeth 12 and the stator yoke 11 enclose to form a stator slot 13. When the number of slots of the stator slot 13 is 15 and the number of pole pairs of the rotor is 5, 1.3 mm < t < 1.5 mm. That is, when the stator slot is provided with 15 slots and the number of pole pairs of the rotor is 5, the thickness of the permanent magnet is set between 1.3 mm and 1.5 mm at this time, so as to further optimize the magnetic field distribution of the motor, further improve the utilization rate of the magnet, further improve the efficiency of the motor, and improve the energy efficiency of the compressor.
[0064] Among them, the stator core 10 is composed of a plurality of stator laminations stacked in sequence, and the rotor core 21 is composed of a plurality of rotor laminations stacked in sequence. By setting the stator laminations and rotor laminations as a plurality, when processing the stator core 10 and the rotor core 21, only a plurality of stator laminations or rotor laminations need to be processed, and then the plurality of stator laminations and rotor lamination parts are assembled into the stator core 10 and the rotor core 21. Compared with processing a complete stator core 10 and rotor core 21, the difficulty of processing the stator laminations and rotor lamination parts is reduced, which is convenient for realizing the automatic production of the stator core 10 and the rotor core 21 through an automatic production line, thereby reducing the production cost.
[0065] In an embodiment, the rotor core 21 and the stator core 10 can be of different materials or shapes, so as to meet the requirements of different processing technologies for the stator and the rotor, which is beneficial to selecting appropriate laminations according to the performance requirements of the motor to form the rotor core 21 and the stator core 10, thereby ensuring the good performance of the electrode and at the same time increasing the wide application range of the motor. In another embodiment, the stator laminations stacked into the stator core 10 are the same as the rotor laminations stacked into the rotor core 21, which is beneficial to the batch production of the laminations and reduces the manufacturing cost.
[0066] In the related art, to ensure that the rotor core 21 does not have problems such as loose laminations or interlayer misalignment, or to ensure that the rotor core 21 does not deform due to the offset of the rotor core 21 between the lamination layers during the winding process of the coil winding, it is required that the motor core has sufficient stacking and riveting strength. In order to ensure that the motor core can have sufficient stacking and riveting strength, therefore, in this embodiment, a plurality of rivet holes are provided on the rotor core 21. Through the cooperation of the rivets and the rivet holes, the fixing strength between the silicon steel sheets can be satisfied, thereby avoiding the problem of interlayer misalignment of the silicon steel sheets during the subsequent processing process.
[0067] It should be noted that in order to reduce or even avoid the problem of interlayer eddy current conduction caused by this stacking and riveting structure, the rotor laminations can be adhesively bonded with glue instead of the stacking and riveting method, which can prevent the insulation surface layer of the silicon steel sheet at the rivet hole from being damaged, thereby avoiding the problem of interlayer eddy current conduction. However, because the glue is expensive and the production line production efficiency is low, it has not been applied to the motor of the air-conditioning compressor.
[0068] In this embodiment, a shaft hole and a current-carrying hole are further provided on the rotor core 21. The shaft hole is used to install a transmission shaft to drive a transmission object to rotate. After the motor is used for a long time, its temperature is likely to rise, which may easily cause the permanent magnet 22 to demagnetize, resulting in the loss or reduction of the magnetism of the permanent magnet 22. Therefore, in this embodiment, by providing a current-carrying hole on the rotor core 21, a refrigerant flows through the current-carrying hole, and the temperature of the rotor core 21 can be reduced through the refrigerant, so as to maintain the permanent magnet 22 within the optimal range, thereby improving the performance of the motor.
[0069] Specifically, the magnetic poles of the permanent magnet 22 are consistent with the radial direction of the rotor core 21, that is, the topological structure of the rotor is radial at this time, and the rotor core 21 is radially distributed outward at this time. That is, the plurality of permanent magnets 22 are arranged along the circumference of the rotor core 21, and the plurality of permanent magnets 22 are arranged end to end. It should be noted that the two magnetic poles N and S of the permanent magnet 22 are respectively located on both sides of the thickness direction of the permanent magnet 22.
[0070] The radial topological structure of the rotor has the following advantages: 1. Small leakage magnetic coefficient: Since the radial structure enables the permanent magnet 22 to be arranged along the radius direction of the rotor, this structure helps to reduce the leakage of magnetic flux outside the rotor, thereby reducing the leakage magnetic coefficient. A smaller leakage magnetic coefficient means that more magnetic flux can be effectively used to generate electromagnetic torque, improving the efficiency of the motor. 2. No isolation measures are required on the rotor: The design of the radial structure makes the permanent magnets 22 arranged closely on the rotor, reducing the possibility of magnetic flux leakage. Therefore, no additional isolation measures are required to prevent the influence of magnetic flux on other parts of the motor. This simplifies the structure of the motor and reduces the manufacturing cost. 3. The pole arc coefficient is easy to control: In the radial structure, by adjusting the shape, size and number of the permanent magnets 22, the pole arc coefficient can be relatively easily controlled, thereby achieving precise control of the motor performance. This helps to meet different application requirements and optimize the motor performance. 4. High mechanical strength of the rotor punching: The radial structure makes the permanent magnets 22 evenly distributed on the rotor core, which helps to improve the mechanical strength of the rotor punching. Stronger mechanical strength means that the rotor can withstand greater torque and higher speed, improving the reliability and durability of the motor. 5. The rotor is not easily deformed after installing the permanent magnet 22: Since the radial structure makes the permanent magnet 22 tightly embedded in the rotor core, this structure helps to reduce the deformation of the rotor during high-speed rotation. The stable rotor shape helps to maintain the stable performance of the motor, reducing vibration and noise.
[0071] In one embodiment, the stator teeth 12 and the stator yoke 11 enclose to form a stator slot 13, and the number of slots of the stator slot 13 is Q, where 15 ≤ Q ≤ 18. The range of the number of slots Q of the stator slot 13 is: 15 ≤ Q ≤ 18; it can be understood that the number of slots Q of the stator slot 13 within this range can provide relatively balanced performance. It is neither too few to affect the efficiency and torque of the motor, nor too many to cause a significant increase in manufacturing cost. Moreover, limiting the number of slots Q of the stator slot 13 between 15 and 18 helps to provide a more uniform magnetic field distribution, thereby reducing the non-uniformity of the magnetic field and improving the efficiency and performance of the motor. Secondly, limiting the number of slots Q of the stator slot 13 between 15 and 18 can make the magnetic field of the motor more uniform, reduce the fluctuation of the magnetic field, and thus reduce the noise of the motor. At the same time, it also helps to reduce the vibration of the motor. Compared with motors with a higher number of slots, motors with 15 to 18 slots may have an advantage in manufacturing cost because they do not require too many winding coils and insulating materials, reducing the manufacturing difficulty and cost. Limiting the number of slots Q of the stator slot 13 between 15 and 18 can improve the efficiency and torque density of the motor. Although increasing the number of slots Q of the stator slot 13 can further improve these performance parameters, relatively high efficiency and torque can already be achieved within the range of 15 to 18.
[0072] Specifically, the number of pole pairs of the rotor is P, where 5 ≤ P ≤ 6; a motor with the number of pole pairs P between 5 and 6 can achieve a better balance between torque and speed. Compared with a motor with a smaller number of pole pairs, a motor with the number of pole pairs P between 5 and 6 has higher torque and lower speed, and is suitable for application scenarios that require high torque and lower speed. Compared with a motor with a larger number of pole pairs, a motor with the number of pole pairs P between 5 and 6 can avoid problems such as an increase in the motor body size and rotor inertia caused by too many poles, thereby maintaining high efficiency.
[0073] In one embodiment, the number of phases of the motor is m, and the number of slots per pole per phase of the motor is q, where q = Q / (2mP) and q < 1. The number of slots per pole per phase q is equal to the ratio of the number of stator slots to twice the product of the number of rotor pole pairs and the number of phases of the motor, and making the number of slots per pole per phase q less than 1 can form a fractional-slot motor as a whole. Under the action of the fractional-slot motor, the cogging torque induced by the rotor permanent magnet magnetic field can be effectively weakened. Moreover, the fractional-slot motor can effectively increase the equivalent number of slots per pole per phase. This means that with the same number of slots, the fractional-slot motor can obtain better distribution performance, making the motor waveform closer to a sine wave. This helps to improve the efficiency and performance of the motor. Secondly, the fractional-slot motor can effectively weaken the per-pole magnetic flux pulsation caused by the change of air-gap permeance, thereby reducing the pulsation amplitude. This helps to improve the electromotive force waveform and reduce the pulsation loss, and improve the operating efficiency and stability of the motor. Since the fractional-slot motor uses fewer slots to obtain the same distribution performance as an integer-slot winding with a large number of slots, its number of slots is relatively small, and it has good processability. This helps to reduce the manufacturing cost of the motor and improve the production efficiency. Furthermore, the torque characteristics of the fractional-slot motor are usually good, and the torque ripple is small. This is because the fractional-slot motor can optimize the magnetic field distribution, reduce the harmonic components, and thus reduce the torque ripple. This makes the fractional-slot motor have an advantage in occasions that require high-precision control and stable operation.
[0074] It can be understood that after reasonably setting the width, thickness of the permanent magnet 22, the width of the stator tooth 12, the thickness of the stator yoke 11 and their proportional relationships through the technical solution of the present invention, when the temperature of the permanent magnet 22 is 20 °C, the remanence of the magnet is 1.3 T to 1.5 T. Remanence means the magnetic field strength that the permanent magnet 22 maintains itself after removing the external magnetic field. The remanence of 1.3 T to 1.5 T indicates that the permanent magnet 22 has a strong magnetism at room temperature and can generate a significant magnetic field. Thus, it can be clearly shown that for the motor after reasonably coordinating the width and thickness of the permanent magnet, the width of the stator tooth 12, and the thickness of the stator yoke 11, the magnetic strength of the permanent magnet 22 is higher, thereby improving the magnetic ability of the permanent magnet 22 and further improving the performance and energy efficiency of the motor.
[0075] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above embodiments. Since the compressor in the technical solution of the present invention adopts all the technical solutions of the above all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one.
[0076] The present utility model also provides a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above-mentioned embodiments. Refrigeration devices can be classified into compression refrigeration devices, absorption refrigeration devices, steam jet refrigeration devices, heat pump refrigeration devices, electrothermal refrigeration devices, etc. The refrigeration device mainly consists of a compressor, an expansion valve, an evaporator, a condenser, and accessories and pipelines. Such as refrigerators, air conditioners, etc. Since the compressor in the technical solution of the present utility model adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one.
[0077] The above is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.
Claims
1. A motor, characterized in that: include: A stator, the stator comprising a stator core, the stator core comprising a stator yoke and stator teeth, the stator teeth being connected to the stator yoke, the stator yoke having a thickness of W1, and the stator teeth having a width of W2; and The rotor comprises a rotor core and a permanent magnet, wherein the rotor core is rotatably arranged in the stator core, a magnet slot is arranged on the rotor core, and the permanent magnet is installed in the magnet slot, the width of the permanent magnet is W3, the thickness of the permanent magnet is t, the number of permanent magnets on each magnetic pole of the rotor is a, and 1.5≤(a*W3*t) / (W1+W2)≤1.
9.
2. The motor according to claim 1, characterized in that 2 <a*W3 / W2<3.5。 3. The motor according to claim 1, characterized in that When the magnetic circuit structure of the permanent magnet is in a straight line, a=1.
4. The motor according to claim 1, characterized in that When the magnetic circuit structure of the permanent magnet is V-shaped, a=2.
5. The motor according to claim 1, characterized in that 0.8 <W1 / W2<1.5。 6. The motor according to claim 1, characterized in that 4.5mm <W1<8mm。 7. The motor according to claim 1, characterized in that 4mm <W2<12mm。 8. The motor according to claim 1, characterized in that 5mm <W3<25mm。 9. The motor according to claim 1, characterized in that 0.5mm <t<2.5mm。 10. The motor according to claim 1, characterized in that 1.2mm <t<2mm。 11. The motor according to claim 1, characterized in that The stator teeth and the stator yoke are combined to form stator slots. When the number of the stator slots is 15 and the number of pole pairs of the rotor is 5, 1.3 mm <t<1.5mm。 12. The motor according to claim 1, characterized in that The magnetic poles of the permanent magnets are consistent with the radial direction of the rotor core.
13. The motor according to claim 1, characterized in that The stator teeth and the stator yoke are combined to form stator slots, and the number of the stator slots is Q, where 15≤Q≤18.
14. The motor according to claim 13, characterized in that The number of pole pairs of the rotor is P, 5≤P≤6.
15. The motor according to claim 14, characterized in that The number of phases of the motor is m, the number of slots per pole and per phase of the motor is q, q=Q / 2mP, q<1.
16. A compressor, characterized in that: Comprising a motor as claimed in any one of claims 1 to 15.
17. A refrigeration device, characterized in that: Comprising a compressor as claimed in claim 16.