Booster pump
By increasing the radial length of the permanent magnet in the motor and reducing the axial length of the rotor core, the problems of large motor size and small magnetic flux in the prior art are solved, and the efficiency improvement and miniaturization of the motor and booster pump are achieved.
Patent Information
- Application Number
- CN202421632479.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-10
AI Technical Summary
The axial length of the motor in the prior art results in a large motor size and a small magnetic flux, which in turn reduces the efficiency of the motor and the booster pump.
By increasing the radial length of the permanent magnet on the rotor core of the motor and reducing the axial length of the rotor core, the dimensional relationship between the permanent magnet and the installation groove is within the range of 1.5≤Z1/L1≤2.5, thereby improving the magnetic flux and efficiency of the motor.
The efficiency improvement of the motor and booster pump is achieved. By reasonably setting the size of the rotor core and permanent magnet, the speed and torque of the motor are increased, and the equipment is miniaturized and efficient.
Smart Images
Figure CN222928149U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of booster pumps, and particularly relates to a booster pump. Background Art
[0002] In the prior art, the length of the motor shaft in the axial direction is relatively long, resulting in a relatively large size of the motor shaft in the axial direction. However, when reducing the size of the motor shaft in the axial direction, the size of the permanent magnet in the motor will be reduced, resulting in a reduction in the magnetic flux of the motor, and further resulting in a reduction in the rotational speed and torque of the motor, thereby reducing the efficiency of the motor and the booster pump. Summary of the Utility Model
[0003] The main object of the utility model is to propose a booster pump, aiming to reduce the axial size of the motor and improve the efficiency of the motor and the booster pump.
[0004] To achieve the above object, the booster pump proposed by the utility model includes:
[0005] A pump head; and
[0006] A motor, the motor is connected to the pump head, the motor includes a rotor core and a permanent magnet, the rotor core includes a rotor yoke and a plurality of rotor teeth, the plurality of rotor teeth are spaced on the outer peripheral surface of the rotor yoke, an installation groove is formed between two adjacent rotor teeth, the permanent magnet is installed in the installation groove, and the length of the rotor core in the axial direction is Z 1 , the length of the permanent magnet in the radial direction of the rotor core is L 1 , 1.5 ≤ Z 1 / L 1 ≤ 2.5.
[0007] In an embodiment, 25mm ≤ Z 1 ≤ 40mm.
[0008] In an embodiment, 10mm ≤ L 1 ≤ 20mm.
[0009] In an embodiment, the thickness of the permanent magnet is t, 3.5mm ≤ t ≤ 6.3mm.
[0010] In an embodiment, the length of the permanent magnet in the axial direction of the rotor core is L 2 , and 30mm ≤ L 2 ≤ 45mm.
[0011] In an embodiment, the rotor further includes a rotating shaft, a shaft hole is provided on the rotor core, the rotating shaft is rotatably connected to the shaft hole, and the length of the rotating shaft is Z 2 , 2 ≤ Z 2 / L2 ≤ 3.
[0012] In one embodiment, both ends of the permanent magnet protrude from the rotor core.
[0013] In one embodiment, the length by which one end of the permanent magnet protrudes from the rotor core is L 3 , L 3 = (L 2 - Z 1 ) / 2, 2.5 mm ≤ L 3 ≤ 3.5 mm.
[0014] In one embodiment, the gap between the permanent magnet and the wall of the installation groove is s, 0.05 mm ≤ s ≤ 0.15 mm.
[0015] In one embodiment, there are 10 permanent magnets and 10 installation grooves provided at intervals. One permanent magnet corresponds to one installation groove.
[0016] The booster pump in the technical solution of the present invention includes a pump head and a motor. The motor is connected to the pump head. The motor includes a rotor core and a permanent magnet. The rotor core includes a rotor yoke and a plurality of rotor teeth. The plurality of rotor teeth are arranged at intervals on the outer peripheral surface of the rotor yoke. An installation groove is formed between two adjacent rotor teeth. The permanent magnet is installed in the installation groove. The length of the rotor core in the axial direction is Z 1 , and the length of the permanent magnet in the radial direction of the rotor core is L 1 , 1.5 ≤ Z 1 / L 1 ≤ 2.5. Compared with the permanent magnet in the prior art, the length of the permanent magnet in the radial direction of the rotor core is increased in the technical solution of the present invention, and the length of the rotor core in the axial direction is reduced, thereby reducing the axial dimension of the motor. At the same time, by setting the dimensional relationship between Z 1 and L 1 within the range of 1.5 ≤ Z 1 / L 1 ≤ 2.5, the magnetic flux of the motor is increased by reasonably setting the dimensions of the rotor core and the permanent magnet, and then the motor speed and torque are reasonably increased, and thus the efficiency of the motor and the booster pump is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention 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 following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.
[0018] Figure 1 Schematic diagram of the structure of an embodiment of the booster pump provided by the present utility model;
[0019] Figure 2 is Figure 1 Schematic diagram of the structure of the motor rotor from one perspective in
[0020] Figure 3 is Figure 1 Schematic diagram of the structure of the motor rotor from another perspective in
[0021] Figure 4 is Figure 1 Schematic diagram of the structure of the motor rotor from yet another perspective in
[0022] Figure 5 is Figure 4 Enlarged view of part A in
[0023] Explanation of the reference numerals in the drawings:
[0024] 1. Pump head.
[0025] 2. Motor; 21. Rotor core; 211. Rotor yoke; 212. Rotor teeth; 213. Magnetic bridge; 214. Installation groove; 215. Support protrusion; 216. Groove; 217. Shaft hole; 22. Permanent magnet; 23. Rotating shaft.
[0026] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments
[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to 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.
[0028] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) 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.
[0029] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood 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 fact that those skilled in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.
[0030] In the prior art, the length of the motor 2 in the axial direction is relatively long, resulting in a relatively large size of the motor 2 in the axial direction. However, while reducing the size of the motor 2 in the axial direction, it will lead to a decrease in the size of the permanent magnet 22 in the motor 2, thereby resulting in a decrease in the magnetic flux of the motor 2, and further leading to a decrease in the rotational speed and torque of the motor 2, and further reducing the efficiency of the motor 2 and the booster pump.
[0031] Refer to Figure 1 、 Figure 3 and Figure 4 , to solve this technical problem, the present utility model proposes a booster pump, comprising:
[0032] A pump head 1; and
[0033] A motor 2, the motor 2 is connected to the pump head 1, the motor 2 includes a rotor core 21 and a permanent magnet 22, the rotor core 21 includes a rotor yoke 211 and a plurality of rotor teeth 212, the plurality of rotor teeth 212 are spaced on the outer peripheral surface of the rotor yoke 211, an installation groove 214 is formed between two adjacent rotor teeth 212, the permanent magnet 22 is installed in the installation groove 214, and the length of the rotor core 21 in the axial direction is Z 1 , the length of the permanent magnet 22 in the radial direction of the rotor core 21 is L 1 , 1.5 ≤ Z 1 / L 1 ≤ 2.5.
[0034] The booster pump in the technical solution of the present utility model includes a pump head 1 and a motor 2. The motor 2 is connected to the pump head 1. The motor 2 includes a rotor core 21 and a permanent magnet 22. The rotor core 21 includes a rotor yoke 211 and a plurality of rotor teeth 212. The plurality of rotor teeth 212 are spaced on the outer peripheral surface of the rotor yoke 211. An installation groove 214 is formed between two adjacent rotor teeth 212. The permanent magnet 22 is installed in the installation groove 214. The length of the rotor core 21 in the axial direction is Z 1 The length of the permanent magnet 22 in the radial direction of the rotor core 21 is L 1 , 1.5 ≤ Z 1 / L 1 ≤ 2.5. Compared with the permanent magnet 22 in the prior art, the length of the permanent magnet 22 in the radial direction of the rotor core 21 is increased in the technical solution of the present utility model, and the length of the rotor core 21 in the axial direction is reduced, thereby reducing the axial dimension of the motor 2. At the same time, by setting the dimensional relationship between Z 1 and L 1 within the range of 1.5 ≤ Z 1 / L 1 ≤ 2.5, by reasonably setting the dimensions of the rotor core 21 and the permanent magnet 22, the magnetic flux of the motor 2 is improved, and then the rotational speed and torque of the motor 2 are reasonably increased, and the efficiency of the motor 2 and the booster pump is improved
[0035] Specifically, 25 mm ≤ Z 1 ≤ 40 mm. When Z 1 > 40 mm, it can be understood that the longer the length of the rotor core 21 of the motor 2, although the output power and efficiency of the motor 2 may be improved, the torque may be correspondingly reduced. Because the longer rotor core 21 can only generate a weak magnetic field, which will limit the stable rotation of the rotor. At the same time, the too long rotor core 21 may cause the core to deform or break, thus affecting the mechanical strength and stability of the motor 2. When Z 1 < 40 mm, the output power and efficiency of the motor 2 will be reduced; therefore, Z 1 is set within a reasonable range of 25 mm to 40 mm, so as to improve the torque of the motor 2 while also improving the output power and efficiency of the motor 2
[0036] Specifically, 10 mm ≤ L 1 ≤ 20 mm. When L 1 > 20 mm, at this time, the length of the permanent magnet 22 in the radial direction of the rotor core 21 is too long, which will increase the magnetic flux path of the permanent magnet 22. However, the too long magnetic flux path will cause the accumulation of heat inside the motor 2, thereby increasing the temperature rise of the motor 2, which is not conducive to the heat dissipation of the permanent magnet 22, and further reducing the stability and service life of the motor 2. When L 1When it is less than 10 mm, the size of the permanent magnet 22 will be too small at this time, resulting in insufficient magnetic flux of the motor 2, thereby reducing the rotational speed and torque of the motor 2, and further reducing the efficiency of the motor 2 and the booster pump.
[0037] In an embodiment, the thickness of the permanent magnet 22 is t, and 3.5 mm ≤ t ≤ 6.3 mm. It can be understood that appropriately increasing the thickness of the permanent magnet 22 can reduce the pole pitch of the permanent magnetic poles, which is beneficial to improving the magnetic focusing effect. At the same time, appropriately increasing the thickness of the permanent magnet 22 can also increase the magnetic flux density of the motor 2, thereby increasing the torque of the motor 2, and thus increasing the output power of the motor 2, and further increasing the efficiency of the motor 2 and the booster pump. However, when t > 6.3 mm, magnetic circuit saturation may occur, resulting in an increase in magnetic circuit loss, instead reducing the efficiency of the motor 2. At the same time, excessively increasing the thickness of the permanent magnet 22 will also increase the material consumption of the permanent magnet 22, thus increasing the cost of the permanent magnet 22. When t < 3.5 mm, the size of the permanent magnet 22 will be too small at this time, resulting in insufficient magnetic flux of the motor 2, thereby reducing the rotational speed and torque of the motor 2, and further reducing the efficiency of the motor 2 and the booster pump.
[0038] Refer to Figure 5 , in an embodiment, the interval between the permanent magnet 22 and the groove wall of the installation groove 214 is s, and 0.05 mm ≤ s ≤ 0.15 mm. It can be understood that the gap between the permanent magnet 22 and the groove wall of the installation groove 214 is the magnetic gap, and the size of the magnetic gap directly affects the efficiency of the motor 2. Theoretically, the smaller the magnetic gap, the greater the relative magnetic field strength, which helps to reduce the magnetic resistance between the rotor and the stator, thereby increasing the efficiency of the motor 2. At the same time, the size of the magnetic gap also affects the noise and vibration of the motor 2; the smaller the magnetic gap, the usually smaller the noise of the motor 2, because the vibration generated by the magnetic field change on the adjacent metal parts will be converted into smaller sound waves; finally, a smaller magnetic gap can increase the magnetic field strength, thereby increasing the output torque of the motor 2, and further increasing the efficiency of the motor 2 and the booster pump. However, when s < 0.05 mm, it will result in too small a magnetic gap, and too small a magnetic gap may cause an increase in rotor eddy current loss and a relatively serious cogging effect, instead reducing the efficiency of the motor 2. At the same time, too small a magnetic gap will increase the installation difficulty of the permanent magnet 22, making the permanent magnet 22 prone to rubbing against the groove wall of the installation groove 214 during installation, thereby shortening the service life of the permanent magnet 22, and further shortening the service life of the motor 2.
[0039] Further, after the permanent magnet 22 is located in the installation groove 214, injection plastic is injected into the installation groove 214 to fix the permanent magnet 22. Compared with the installation method of fixing the permanent magnet 22 by screws, the fixing effect of the injection plastic is better, and the injection plastic is flexible and not easy to scratch the outer surface of the permanent magnet 22, while the permanent magnet 22 is easily scratched during screw connection, which will change the magnetic flux path inside the permanent magnet 22 and thus reduce the efficiency of the motor 2. At the same time, the mass of the injection plastic is smaller, thus reducing the weight of the motor 2 and the booster pump.
[0040] Among them, the injection molding material includes PBT and glass fiber (GF) to have high heat resistance, good tensile strength and bending strength to adapt to the normal operation of the motor 2 under different working conditions. Further, the injection plastic is arranged on the outer periphery of the rotor, which helps to improve the connection strength between the rotor core 21 and the permanent magnet 22.
[0041] In an embodiment, both the permanent magnet 22 and the installation groove 214 are provided with 10 at intervals, and one permanent magnet 22 is arranged corresponding to one installation groove 214. That is, the number of pole pairs of the rotor is 5. First, as the number of pole pairs increases, the magnetic flux per pole decreases, which is beneficial to reducing the winding inductance and the stator yoke thickness, thereby improving the power density of the motor 2, so that the motor 2 has a large power range and can achieve high-power output. Second, the number of pole pairs of the rotor being 5 also indicates that the torque of the rotor is relatively large, which is suitable for occasions with heavy loads, and its large torque can ensure stable operation under heavy loads. Third, the motor 2 with 5 pole pairs of the rotor has a wide speed range and can adapt to different working environments. This characteristic enables the motor 2 with 5 pole pairs to perform excellently in a variety of application scenarios. Further, the motor 2 with five pole pairs starts smoothly and has low noise. The five-pole motor 2 shows good smoothness during startup and has low noise. This is mainly due to its internal permanent magnet synchronous motor 2 design and precise encoder feedback control. Finally, the motor 2 with 5 pole pairs of the rotor has high efficiency and has a high efficiency during operation.
[0042] In one embodiment, the motor 2 includes a stator and a rotor. The stator is connected to the pump head 1. The rotor includes a rotor core 21, permanent magnets 22, and a rotating shaft 23. The rotating shaft 23 is installed on the rotor core 21, and the rotor core 21 is rotatably connected to the inside of the stator through the rotating shaft 23. The rotor core 21 includes a rotor yoke 211, a plurality of rotor teeth 212, and a plurality of magnetic bridges 213. The plurality of magnetic bridges 213 are spaced apart on the outer peripheral surface of the rotor yoke 211. The rotor teeth 212 are connected to the rotor yoke 211 through the magnetic bridges 213. One rotor tooth 212 corresponds to one magnetic bridge 213. An installation groove 214 is formed between two adjacent rotor teeth 212. A support protrusion 215 is provided on the outer peripheral surface of the rotor yoke 211. The permanent magnet 22 is installed in the installation groove 214 and abuts against the support protrusion 215.
[0043] Further, the distance between two adjacent permanent magnets 22 at the end facing the rotor yoke 211 is d 1 , 0.8 mm ≤ d 1 ≤ 1.5 mm. The distance between two adjacent permanent magnets 22 at the end facing the rotor yoke 211 also belongs to a part of the magnetic gap. The size of the magnetic gap directly affects the efficiency of the motor 2. Theoretically, the smaller the magnetic gap, the greater the relative magnetic field strength, which helps to reduce the magnetic resistance between the rotor and the stator, thereby improving the efficiency of the motor 2. At the same time, the size of the magnetic gap also affects the noise and vibration of the motor 2; the smaller the magnetic gap, the usually smaller the noise of the motor 2, because the vibration generated by the magnetic field change on the adjacent metal parts will be converted into smaller sound waves; finally, the smaller magnetic gap can increase the magnetic field strength, thereby increasing the output torque of the motor 2, and further improving the efficiency of the motor 2 and the booster pump. When d 1 <0.8 mm, it will cause the distance between two adjacent permanent magnets 22 at the end facing the rotor yoke 211 to be too small, and the too small distance will cause the magnetic field to be too concentrated locally, resulting in uneven magnetic field distribution, thereby reducing the efficiency of the motor 2 and the booster pump.
[0044] Further, the distance between two adjacent permanent magnets 22 at the end away from the rotor yoke 211 is d 2 , 7 mm ≤ d 2≤12mm. The distance between two adjacent permanent magnets 22 away from one end of the rotor yoke 211 is also part of the magnetic gap, and the size of the magnetic gap directly affects the efficiency of the motor 2. In theory, the smaller the magnetic gap, the greater the relative magnetic field strength will be, which helps to reduce the magnetic resistance between the rotor and the stator, thereby improving the efficiency of the motor 2. At the same time, the size of the magnetic gap will also affect the noise and vibration of the motor 2; the smaller the magnetic gap, the smaller the noise of the motor 2 is generally, because the vibrations generated by the change in the magnetic field on the adjacent metal parts are converted into smaller sound waves; finally, a smaller magnetic gap can increase the magnetic field strength, thereby increasing the output torque of the motor 2, thereby improving the efficiency of the motor 2 and the boost pump. And when d 2 When it is less than 7mm, the distance between two adjacent permanent magnets 22 away from one end of the rotor yoke 211 will be too small. At this time, the magnetic field may leak to the outside of the motor 2 without being fully utilized, which not only reduces the magnetic field efficiency inside the motor 2, but also may cause unnecessary electromagnetic interference to the surrounding environment, thereby reducing the use effect of the motor 2 and the boost pump and reducing the user experience.
[0045] In this embodiment, one supporting protrusion is provided corresponding to the permanent magnet 22 and is located on the center line of the rotor core 21 , so as to improve the force uniformity of the permanent magnet 22 and ensure the stable installation of the permanent magnet 22 .
[0046] In another embodiment, while meeting the requirement of lightweighting the rotor, a plurality of supporting protrusions are provided corresponding to the permanent magnets 22 and are symmetrically arranged with respect to the center line of the rotor core 21, so as to ensure uniform force on the permanent magnets 22 and improve the connection strength between the permanent magnets 22 and the rotor core 21.
[0047] Preferably, in the axial direction of the rotor core 21, a plurality of support protrusions are arranged at intervals. This can not only reduce the overall weight of the rotor, but also help to isolate the magnetic flux on two adjacent support protrusions, reduce magnetic flux leakage, and improve the efficiency and performance of the motor 2.
[0048] Furthermore, the side of the supporting protrusion facing the permanent magnet 22 is arranged in an arc shape, which can support the contact area between the protrusion and the permanent magnet 22 as much as possible compared to a flat surface, which helps to reduce the stress at the first end and ensure the permanent magnet 22 is firmly installed in the installation groove 214.
[0049] In an embodiment of the present utility model, the rotor teeth 212 are connected to the outer peripheral wall of the rotor yoke 211 through magnetic bridges 213. Grooves 216 are formed between two adjacent magnetic bridges 213 and the rotor yoke 211. The supporting convex portion is connected to the bottom wall of the groove 216. On the one hand, it can improve the overall structural strength of the rotor core 21 and facilitate the assembly of the rotor core 21 and the permanent magnet 22. On the other hand, by forming the grooves 216, compared with the two magnetic bridges 213 being connected together, it is convenient to improve the magnetic flux leakage of the rotor core 21 through the magnetic bridges 213 to the rotor yoke 211, and reduce the rotor weight.
[0050] Wherein, in the axial direction of the rotor core 21, the thickness of the magnetic bridge 213 can be less than the thickness of the rotor core 21, further reducing magnetic flux leakage, thereby effectively improving the efficiency and performance of the motor 2.
[0051] In an embodiment, the length of the permanent magnet 22 in the axial direction of the rotor core 21 is L 2 and 30 mm ≤ L 2 ≤ 45 mm. Compared with the permanent magnet 22 in the prior art, the length of the permanent magnet 22 in the axial direction of the rotor core 21 is shortened in the technical solution of the present utility model, thereby reducing the volume of the motor 2 in the axial direction of the rotor core 21, and further facilitating the miniaturization of the motor 2 and the booster pump. Therefore, if L 2 > 45 mm, it will cause the length of the permanent magnet 22 in the axial direction of the rotor core 21 to be too long, further increasing the size of the motor 2 in the axial direction and being unfavorable for the miniaturization of the motor 2. If L 2 < 30 mm, it will cause the length of the permanent magnet 22 to be too small, resulting in insufficient magnetic flux of the permanent magnet 22, and further reducing the rated power and output power of the motor 2.
[0052] Specifically, a shaft hole 217 is provided on the rotor core 21, the rotating shaft 23 is rotatably connected to the shaft hole 217, and the length of the rotating shaft 23 is Z 2 and 2 ≤ Z 2 / L 2 ≤ 3. It can be understood that if the axial length of the permanent magnet 22 is too short relative to the length of the rotating shaft 23, it may cause the magnetic flux path to be too short, the magnetic resistance to be small, but the magnetic flux density may be insufficient, affecting the performance of the motor 2. On the contrary, if the axial length of the permanent magnet 22 is too long, it may increase the magnetic resistance of the magnetic flux path and the interpolar magnetic flux leakage, also having a negative impact on the performance of the motor 2. At the same time, too long a rotating shaft 23 will cause the torque of the motor 2 to decrease; on the contrary, if the length of the rotating shaft 23 is too small, it may cause the motor 2 to be subjected to greater stress during high-speed operation, thereby increasing the wear of the rotating shaft 23 and the bearing and shortening the service life of the motor 2. Therefore, the length of the rotating shaft 23 and the length of the permanent magnet 22 in the axial direction of the rotor core 21 are set to 2 ≤ Z 2 / L2 within the range of ≤ 3, so as to improve the torque and power of the motor 2 by reasonably setting the dimensions, and further improve the service life of the motor 2.
[0053] In one embodiment, both ends of the permanent magnet 22 protrude from the rotor core 21 in the axial direction of the rotor core 21. First, setting the permanent magnet 22 to protrude from the rotor core 21 enables the permanent magnet 22 to be directly exposed to the air, resulting in better heat dissipation performance of the permanent magnet 22, which in turn helps to reduce the temperature rise of the motor 2 and improve the thermal stability and reliability of the motor 2. Second, setting the permanent magnet 22 to protrude from the rotor core 21 simplifies the processing technology of the motor 2 and reduces the production and manufacturing cost of the motor 2.
[0054] First, the length of the permanent magnet 22 protruding from the rotor core 21 directly affects the magnetic field distribution of the motor 2; the longer the protruding length, the more sinusoidal the air-gap magnetic density distribution of the motor 2, which helps to reduce harmonics and vibrations during the operation of the motor 2, thereby reducing the noise generated during the operation of the motor 2. Second, the change in the magnetic field distribution also affects the torque and efficiency of the motor 2; an appropriate protruding length can provide a more uniform magnetic field distribution, thereby improving the torque and efficiency of the motor 2. However, if the protruding length of the permanent magnet 22 is too long, it may increase the magnetic resistance and magnetic leakage of the motor 2, thereby reducing the efficiency of the motor 2; at the same time, the too long protruding length may cause the permanent magnet 22 to be subjected to more thermal stress, affecting its performance and service life. Therefore, in one embodiment, the length of one end of the permanent magnet 22 protruding from the rotor core 21 is L 3 , L 3 =(L 2 -Z 1 ) / 2, 2.5mm ≤ L 3 ≤ 3.5mm. Thus, the length of one end of the permanent magnet 22 protruding from the rotor core 21 is within a reasonable range, thereby improving the efficiency of the motor 2, reducing the noise generated by the motor 2, and improving the performance and service life of the motor 2.
[0055] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.
Claims
1. A booster pump, characterized in that: include: Pump head; and A motor connected to the pump head, the motor comprising a rotor core and a permanent magnet, the rotor core comprising a rotor yoke and a plurality of rotor teeth, the plurality of rotor teeth being spaced apart on the outer circumferential surface of the rotor yoke, a mounting groove being formed between two adjacent rotor teeth, the permanent magnet being mounted in the mounting groove, the length of the rotor core in the axial direction being Z1, the length of the permanent magnet in the radial direction of the rotor core being L1, 1.5≤Z1 / L1≤2.
5.
2. The booster pump according to claim 1, characterized in that: 25mm≤Z1≤40mm.
3. The booster pump according to claim 1, characterized in that: 10mm≤L1≤20mm.
4. The booster pump according to claim 1, characterized in that: The thickness of the permanent magnet is t, 3.5 mm≤t≤6.3 mm.
5. The booster pump according to claim 1, characterized in that: The length of the permanent magnet along the axial direction of the rotor core is L2, and 30mm≤L2≤45mm.
6. The booster pump according to claim 5, characterized in that: The rotor further includes a rotating shaft. The rotor core is provided with an axial hole. The rotating shaft is rotatably connected to the axial hole. The length of the rotating shaft is Z2, 2≤Z2 / L2≤3.
7. The booster pump according to claim 5, characterized in that: Both ends of the permanent magnet are protruding from the rotor core.
8. The booster pump according to claim 7, characterized in that: The length of one end of the permanent magnet protruding from the rotor core is L3, L3 = (L2 - Z1) / 2, 2.5 mm ≤ L3 ≤ 3.5 mm.
9. The booster pump according to claim 1, characterized in that: The interval between the permanent magnet and the wall of the installation groove is s, 0.05mm≤s≤0.15mm.
10. The booster pump according to claim 1, characterized in that: There are 10 permanent magnets and installation slots spaced apart from each other, and one permanent magnet is arranged corresponding to one installation slot.