WO2022041136A1 - Balancing plate and electric motor - Google Patents

Balancing plate and electric motor Download PDF

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Publication number
WO2022041136A1
WO2022041136A1 PCT/CN2020/112192 CN2020112192W WO2022041136A1 WO 2022041136 A1 WO2022041136 A1 WO 2022041136A1 CN 2020112192 W CN2020112192 W CN 2020112192W WO 2022041136 A1 WO2022041136 A1 WO 2022041136A1
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WO
WIPO (PCT)
Prior art keywords
balance plate
rotor
axial direction
outer ring
inner ring
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PCT/CN2020/112192
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French (fr)
Chinese (zh)
Inventor
胡亮
龚宇
Original Assignee
舍弗勒技术股份两合公司
胡亮
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Application filed by 舍弗勒技术股份两合公司, 胡亮 filed Critical 舍弗勒技术股份两合公司
Priority to PCT/CN2020/112192 priority Critical patent/WO2022041136A1/en
Publication of WO2022041136A1 publication Critical patent/WO2022041136A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/04—Balancing means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft

Definitions

  • the present invention relates to the field of electrical machines (motors and/or generators), and in particular to balance plates for electrical machines.
  • Motors are prone to generate heat during rotation, especially for permanent magnet synchronous motors with long life cycles, integrated magnetic cores in the rotor, and high energy density.
  • the increase in motor temperature will affect, for example, copper wires in the motor, etc.
  • the life of the conductive material and the electromagnetic properties of the magnetic core will further affect the output power of the motor. Therefore, the problem of heat dissipation is an issue worthy of consideration when designing a motor.
  • Figure 1 shows an assembly of a permanent magnet synchronous motor with a magnetic core, which includes a rotor E1, a stator E2, a magnetic core E3, a cooling jacket E4, a balance plate E5, a housing E6, an end cover E7, a rotating shaft E8 and Bearing E9.
  • the rotor E1 is located on the inner peripheral side of the stator E2, the magnetic core E3 is embedded in the rotor E1, and the balance plate E5 is arranged on the axial end face of the rotor E1 to adjust the moment of inertia of the rotor E1.
  • Path 1 is shown by the arrow r1 in the figure, the heat is first transferred to the stator E2 through the thermal convection of the air between the rotor E1 and the stator E2, and then transferred to the cooling jacket E4 by the stator E2;
  • Path 2 is shown by the arrow r2 in the figure , the heat is first conducted to the balance plate E5, and then transferred to the shell E6 and the end cover E7 through the thermal convection of the air inside the motor;
  • the path 3 is shown by the arrow r3 in the figure, the heat is first conducted to the rotating shaft E8, and then conducted to the bearing E9 to Housing E6 and end cap E7.
  • the motor shown in Fig. 1 is simulated by computer fluid dynamics (CFD) simulation software. The results show that when the motor is no-load, when the speed of the rotor E1 is 16000rpm, the average flow of the air inside the motor in the radial direction The speed is 4.4m/s.
  • CFD computer fluid dynamics
  • the purpose of the present invention is to overcome or at least alleviate the above-mentioned deficiencies of the prior art, and to provide a balance plate and a motor that can promote air convection in the motor.
  • a balance plate which is provided at an end portion of a rotor of a motor in the axial direction and connected to the rotor in a non-rotatable manner, the balance plate is in the shape of a disk,
  • the balance plate has a first end facing the rotor and a second end facing away from the rotor in the axial direction, wherein,
  • the balance plate includes an inner ring, an outer ring and a plurality of blades,
  • Both the inner ring and the outer ring are annular, and the outer ring is located on the outer peripheral side of the inner ring, and in the radial direction of the balance plate, the vanes connect the inner ring and the outer ring ,
  • the plurality of vanes are arranged at intervals in the circumferential direction of the balance plate, and a hollow portion penetrating in the axial direction of the balance plate is formed between adjacent vanes.
  • the surface of the vane proximate the second end is partially convex to form a protrusion.
  • the protrusion is X-shaped when viewed along the axial direction.
  • the convex portion in the axial direction, does not extend beyond the inner ring and/or the outer ring.
  • the protrusion is flush with the inner ring and/or the outer ring in the axial direction.
  • the blade has two straight sides on a section perpendicular to the axial direction, and both of the two straight sides are parallel to the radial direction of the balance plate.
  • the surface of the inner ring and/or the outer ring near the first end extends beyond the surface of the blade near the first end in the axial direction.
  • the surface of the blade proximate the first end is planar.
  • the closer to the second end the larger the diameter of the inner peripheral wall of the outer ring.
  • the inner peripheral wall is part of a conical or spherical surface.
  • the number of the vanes is 8, and the 8 vanes are evenly distributed in the circumferential direction.
  • the balance plate further includes an annular bushing, which is installed on the inner peripheral side of the inner ring in an interference fit with the inner ring.
  • a motor which includes a rotor, a stator and a balance plate, the rotor is rotatable relative to the stator, and the balance plate and the rotor are provided on the rotor so as to be non-rotatable relative to the rotor At least one end face in the axial direction of , wherein the balance plate is the balance plate according to the present invention.
  • the rotor is located on the inner peripheral side of the stator.
  • the balance plate according to the present invention is simple in structure and has good performance in promoting air circulation inside the motor.
  • the motor according to the present invention has a simple structure and good heat dissipation.
  • Figure 1 is a schematic half-section of a possible motor.
  • Figure 2 is a schematic illustration of a second end of a balance plate according to one embodiment of the present invention.
  • FIG. 3 is an axial cross-sectional view of the balance plate shown in FIG. 2 .
  • FIG. 4 is a perspective view of the balance plate shown in FIG. 2 .
  • A represents the axial direction of the balance plate, which is consistent with the axial direction of the rotor of the motor;
  • R represents the radial direction of the balance plate, and the radial direction R is consistent with the radial direction of the rotor of the motor.
  • balance plate according to the present invention will be described with reference to FIGS. 2 to 4 .
  • the balance plate is in the shape of a disc, which includes a bushing 10 and a disc body 20 which are both annular.
  • the disc body 20 is sleeved on the outer periphery of the bushing 10 , and the bushing 10 and the disc body 20 are connected with interference fit.
  • the bushing 10 is used for connecting the disc body 20 and the rotating shaft which rotates synchronously with the rotor of the motor.
  • the thermal expansion coefficient of the manufacturing material of the bushing 10 is close to that of the rotating shaft, so that the bushing 10 is not easily loosened from the rotating shaft when the temperature changes.
  • the disk body 20 includes an inner ring 21 , an outer ring 22 and a plurality of (eight in this embodiment) vanes 23 .
  • the inner ring 21 is located on the inner peripheral portion of the disk body 20
  • the outer ring 22 is located on the outer peripheral portion of the disk body 20
  • the vanes 23 are located between the inner ring 21 and the outer ring 22 in the radial direction R, and the vanes 23 connect the inner ring 21 and the outer ring 22.
  • Circle 22 The inner ring 21 is located on the inner peripheral portion of the disk body 20
  • the outer ring 22 is located on the outer peripheral portion of the disk body 20
  • the vanes 23 are located between the inner ring 21 and the outer ring 22 in the radial direction R, and the vanes 23 connect the inner ring 21 and the outer ring 22.
  • Circle 22 is
  • the plurality of blades 23 are evenly arranged in the circumferential direction of the disk body 20 , and a hollow portion K penetrating in the axial direction A is formed between adjacent blades 23 .
  • the vane 23 has a substantially rectangular shape, which means that the main body of the vane 23 has two straight sides on a cross section perpendicular to the axial direction A, both of which are parallel to the radial direction R of the balance plate. It should be understood that since the edges of the vanes 23 that intersect with the inner ring 21 and the outer ring 22 are arc-shaped, the substantially rectangular-shaped vanes 23 described above are not completely rectangular.
  • each side of the inner ring 21 and the outer ring 22 in the axial direction A are flush in the axial direction A, and the inner ring 21 and the outer ring 22 are in the axial direction A. Both sides of the upper body extend beyond the body of the blade 23 .
  • the end of the balance plate facing the rotor in the axial direction A is defined as the first end, and the end away from the rotor is defined as the second end.
  • the vanes 23 are recessed (or at least partially recessed) in the inner ring 21 and the outer ring 22, which creates a cavity for air circulation between the vanes 23 and the rotor, and the cavity is connected to the hollow part K Therefore, when the balance plate rotates with the rotor and agitates the air, the flowing air can form a large area of contact with the rotor.
  • the surface of the vane 23 near the first end is flat.
  • the surfaces of the vanes 23 are partially convex to form protrusions 23a.
  • the convex portion 23a can promote the air flow inside the motor.
  • the convex portion 23a has an X-shape in a cross section perpendicular to the axial direction A, and the two intersecting strip-shaped portions of the X-shape extend along the diagonal lines of the substantially rectangular blade 23, respectively.
  • the inner ring 21 , the outer ring 22 and the protrusion 23a are flush, so that the balance plate does not take up too much space at the rotor end.
  • the inner peripheral wall 22a of the outer ring 22 is inclined with respect to the axial direction A, and the diameter of the inner peripheral wall 22a of the outer ring increases toward the second end in the axial direction A. As shown in FIG.
  • the inner peripheral wall 22a may be a part of the conical surface.
  • the sloping inner peripheral wall 22a allows the air to have a greater component velocity in the radial direction R as it flows near the balance plate.
  • the inner peripheral wall 22a may also be in the form of rounded corners.
  • the present invention also provides a motor comprising a rotor, a stator and at least one balance plate according to the present invention, the balance plate being arranged at at least one end of the rotor.
  • the motor is an inner rotor motor, and the rotor is arranged on the inner peripheral side of the stator.
  • a simulation test of the motor according to the present invention was carried out using CFD simulation software. Experiments show that when the motor is no-load and the rotor speed is 16000rpm, the average flow velocity of the air inside the motor is 17.5m/s, which is much higher than the average air velocity inside the motor described in the background art. This shows that the balance plate according to the present invention promotes thermal convection inside the motor. The test also shows that the thermal power transferred from the heat source component to the cooling component is increased from 370w to 713w, and the maximum temperature of the magnetic core E3 is reduced from 175°C to 713w. 157°C.
  • Table 1 shows the different performances of the motor in the background art (comparative group) and the motor according to the present invention in the CFD simulation test.
  • the balance plate according to the present invention can effectively promote the flow of the air inside the motor because of the blades 23; at the first end of the balance plate, a cavity can be formed between the blades 23 and the rotor, which increases the distance between the air and the rotor. Contact area, at the second end of the balance plate, the protrusion 23a enhances the flow of air.
  • the inner peripheral wall 22a of the outer ring 22 is inclined and arranged to increase the component velocity of the air inside the motor in the radial direction R. As shown in FIG.
  • the balance plate according to the present invention changes little to the shape and size of the original balance plate of the motor, and can better adapt to other parts of the motor assembly.
  • the balance plate may not have the bushing 10, but directly connect the disk body 20 to the rotating part of the motor.
  • the electric machine can also be an outer rotor (rotor is located on the outer circumference of the stator) electric machine.
  • the present invention does not limit the number of blades 23 .
  • the present invention does not limit the shape of the blade 23, and it does not have to be a substantially rectangular shape.
  • the present invention does not limit the shape of the convex portion 23a, and it does not have to be an X-shape.
  • the balance plate according to the present invention is preferably used in a permanent magnet synchronous motor, the invention is not limited thereto, and the balance plate can also be used in other types of motors.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

A balancing plate, which is used for being arranged at an end in an axial direction (A) of a rotor of an electric motor and cannot be rotationally connected to the rotor. The balancing plate is disk-shaped and provided, in the axial direction (A), with a first end facing the rotor and a second end away from the rotor. The balancing plate comprises an inner ring (21), an outer ring (22) and a plurality of blades (23). The inner ring (21) and the outer ring (22) are both annular, the outer ring (22) is located on a peripheral side of the inner ring (21), and in a radial direction (R) of the balancing plate, the blades (23) connect the inner ring (21) and the outer ring (22); the plurality of blades (23) are arranged in a circumferential direction of the balancing plate at intervals; and hollowed-out portions (K) which pass along the axial direction (A) of the balancing plate are formed between the adjacent blades (23). The present invention further provides an electric motor.

Description

平衡板和电机Balance Plate and Motor 技术领域technical field
本发明涉及电机(电动机和/或发电机)领域，且特别地涉及电机的平衡板。The present invention relates to the field of electrical machines (motors and/or generators), and in particular to balance plates for electrical machines.
背景技术Background technique
电机在转动过程中容易产生热量，尤其是对于具有长寿命周期的、在转子内集成磁芯的、具有高能量密度的永磁同步电机，电机温度的升高会影响例如电机内的铜线等导电材料的寿命以及磁芯的电磁性能，也会进一步影响电机的输出功率。因此，散热问题是电机设计时值得重点考虑的问题。Motors are prone to generate heat during rotation, especially for permanent magnet synchronous motors with long life cycles, integrated magnetic cores in the rotor, and high energy density. The increase in motor temperature will affect, for example, copper wires in the motor, etc. The life of the conductive material and the electromagnetic properties of the magnetic core will further affect the output power of the motor. Therefore, the problem of heat dissipation is an issue worthy of consideration when designing a motor.
图1示出了一种具有磁芯的永磁同步电机的总成，其包括转子E1、定子E2、磁芯E3、冷却套E4、平衡板E5、壳体E6、端盖E7、转轴E8和轴承E9。转子E1位于定子E2的内周侧，转子E1内嵌设磁芯E3，平衡板E5设置于转子E1的轴向端面、以调整转子E1的转动惯量。Figure 1 shows an assembly of a permanent magnet synchronous motor with a magnetic core, which includes a rotor E1, a stator E2, a magnetic core E3, a cooling jacket E4, a balance plate E5, a housing E6, an end cover E7, a rotating shaft E8 and Bearing E9. The rotor E1 is located on the inner peripheral side of the stator E2, the magnetic core E3 is embedded in the rotor E1, and the balance plate E5 is arranged on the axial end face of the rotor E1 to adjust the moment of inertia of the rotor E1.
转子E1和磁芯E3转动时会产生热量，这些热量大致由三条路径向周围零部件传递。路径一如图中箭头r1所示，热量首先通过转子E1和定子E2之间的空气的热对流而传递给定子E2，之后由定子E2传递给冷却套E4；路径二如图中箭头r2所示，热量首先传导至平衡板E5，然后通过电机内部空气的热对流传递给壳体E6和端盖E7；路径三如图中箭头r3所示，热量首先传导至转轴E8，然后通过轴承E9传导至壳体E6和端盖E7。When the rotor E1 and the magnetic core E3 rotate, heat is generated, and the heat is transferred to the surrounding parts through three paths. Path 1 is shown by the arrow r1 in the figure, the heat is first transferred to the stator E2 through the thermal convection of the air between the rotor E1 and the stator E2, and then transferred to the cooling jacket E4 by the stator E2; Path 2 is shown by the arrow r2 in the figure , the heat is first conducted to the balance plate E5, and then transferred to the shell E6 and the end cover E7 through the thermal convection of the air inside the motor; the path 3 is shown by the arrow r3 in the figure, the heat is first conducted to the rotating shaft E8, and then conducted to the bearing E9 to Housing E6 and end cap E7.
虽然跟随转子E2转动的平衡板E5能给其周围的空气带来一定的搅动，但是该搅动范围是非常有限的，且被搅动的空气在电机的径向上的流动速率很小。利用计算机流体力学(Computational Fluid Dynamics,CFD)仿真软件对图1所示的电机进行仿真，结果表明，电机空载时，当转子E1的转速为 16000rpm时，电机内部的空气在径向上的平均流动速度为4.4m/s。这导致热源部件(例如包括转子E1、定子E2、磁芯E3和铜线)上的热量只有一小部分能传递到降温部件(例如包括冷却套E4、壳体E6和端盖E7)。仿真结果显示，磁芯E3的最高温度可达175℃，这是非常糟糕的。Although the balance plate E5 rotating with the rotor E2 can bring a certain amount of agitation to the air around it, the agitation range is very limited, and the flow rate of the agitated air in the radial direction of the motor is very small. The motor shown in Fig. 1 is simulated by computer fluid dynamics (CFD) simulation software. The results show that when the motor is no-load, when the speed of the rotor E1 is 16000rpm, the average flow of the air inside the motor in the radial direction The speed is 4.4m/s. This results in only a fraction of the heat on the heat source components (eg including rotor E1, stator E2, magnetic core E3 and copper wires) being transferred to cooling components (eg including cooling jacket E4, housing E6 and end cap E7). Simulation results show that the maximum temperature of core E3 can reach 175°C, which is very bad.
发明内容SUMMARY OF THE INVENTION
本发明的目的在于克服或至少减轻上述现有技术存在的不足，提供一种可以促进电机内的空气对流的平衡板和电机。The purpose of the present invention is to overcome or at least alleviate the above-mentioned deficiencies of the prior art, and to provide a balance plate and a motor that can promote air convection in the motor.
根据本发明的第一方面，提供一种平衡板，其用于设置在电机的转子的轴向上的端部、并与所述转子不能相对转动地连接，所述平衡板呈圆盘形，所述平衡板在所述轴向上具有用于朝向所述转子的第一端和背离所述转子的第二端，其中，According to a first aspect of the present invention, there is provided a balance plate, which is provided at an end portion of a rotor of a motor in the axial direction and connected to the rotor in a non-rotatable manner, the balance plate is in the shape of a disk, The balance plate has a first end facing the rotor and a second end facing away from the rotor in the axial direction, wherein,
所述平衡板包括内圈、外圈和多个叶片，The balance plate includes an inner ring, an outer ring and a plurality of blades,
所述内圈和所述外圈均呈环状，且所述外圈位于所述内圈的外周侧，在所述平衡板的径向上，所述叶片连接所述内圈和所述外圈，Both the inner ring and the outer ring are annular, and the outer ring is located on the outer peripheral side of the inner ring, and in the radial direction of the balance plate, the vanes connect the inner ring and the outer ring ,
所述多个叶片在所述平衡板的周向上间隔开地排布，相邻的所述叶片之间形成在所述平衡板的轴向上贯通的镂空部。The plurality of vanes are arranged at intervals in the circumferential direction of the balance plate, and a hollow portion penetrating in the axial direction of the balance plate is formed between adjacent vanes.
在至少一个实施方式中，所述叶片的靠近所述第二端的表面部分地凸出而形成凸部。In at least one embodiment, the surface of the vane proximate the second end is partially convex to form a protrusion.
在至少一个实施方式中，沿所述轴向观察，所述凸部呈X形。In at least one embodiment, the protrusion is X-shaped when viewed along the axial direction.
在至少一个实施方式中，在所述轴向上，所述凸部不超出所述内圈和/或所述外圈。In at least one embodiment, in the axial direction, the convex portion does not extend beyond the inner ring and/or the outer ring.
在至少一个实施方式中，在所述轴向上，所述凸部与所述内圈和/或所述外圈齐平。In at least one embodiment, the protrusion is flush with the inner ring and/or the outer ring in the axial direction.
在至少一个实施方式中，所述叶片在垂直于所述轴向的截面上具有两个直边，所述两个直边均与所述平衡板的径向平行。In at least one embodiment, the blade has two straight sides on a section perpendicular to the axial direction, and both of the two straight sides are parallel to the radial direction of the balance plate.
在至少一个实施方式中，在所述轴向上，所述内圈和/或所述外圈的靠近所述第一端的表面超出所述叶片的靠近所述第一端的表面。In at least one embodiment, the surface of the inner ring and/or the outer ring near the first end extends beyond the surface of the blade near the first end in the axial direction.
在至少一个实施方式中，所述叶片的靠近所述第一端的表面为平面。In at least one embodiment, the surface of the blade proximate the first end is planar.
在至少一个实施方式中，在所述轴向上，越靠近所述第二端、所述外圈的内周壁的直径越大。In at least one embodiment, in the axial direction, the closer to the second end, the larger the diameter of the inner peripheral wall of the outer ring.
在至少一个实施方式中，所述内周壁为锥面或球面的一部分。In at least one embodiment, the inner peripheral wall is part of a conical or spherical surface.
在至少一个实施方式中，所述叶片有8个，8个所述叶片在所述周向上均匀分布。In at least one embodiment, the number of the vanes is 8, and the 8 vanes are evenly distributed in the circumferential direction.
在至少一个实施方式中，所述平衡板还包括环形的衬套，所述衬套与所述内圈过盈配合地安装于所述内圈的内周侧。In at least one embodiment, the balance plate further includes an annular bushing, which is installed on the inner peripheral side of the inner ring in an interference fit with the inner ring.
根据本发明的第二方面，提供一种电机，其包括转子、定子和平衡板，所述转子能相对于所述定子转动，所述平衡板与所述转子不能相对转动地设置于所述转子的轴向上的至少一个端面，其中，所述平衡板为根据本发明的平衡板。According to a second aspect of the present invention, a motor is provided, which includes a rotor, a stator and a balance plate, the rotor is rotatable relative to the stator, and the balance plate and the rotor are provided on the rotor so as to be non-rotatable relative to the rotor At least one end face in the axial direction of , wherein the balance plate is the balance plate according to the present invention.
在至少一个实施方式中，所述转子位于所述定子的内周侧。In at least one embodiment, the rotor is located on the inner peripheral side of the stator.
根据本发明的平衡板结构简单、且对电机内部空气循环的促进性能好。The balance plate according to the present invention is simple in structure and has good performance in promoting air circulation inside the motor.
根据本发明的电机结构简单、散热性好。The motor according to the present invention has a simple structure and good heat dissipation.
附图说明Description of drawings
图1是一种可能的电机的半剖示意图。Figure 1 is a schematic half-section of a possible motor.
图2是根据本发明的一个实施方式的平衡板的第二端的示意图。Figure 2 is a schematic illustration of a second end of a balance plate according to one embodiment of the present invention.
图3是图2所示的平衡板的轴向剖视图。FIG. 3 is an axial cross-sectional view of the balance plate shown in FIG. 2 .
图4是图2所示的平衡板的立体图。FIG. 4 is a perspective view of the balance plate shown in FIG. 2 .
附图标记说明：Description of reference numbers:
E1转子；E2定子；E3磁芯；E4冷却套；E5平衡板；E6壳体；E7端盖；E8转轴；E9轴承；E1 rotor; E2 stator; E3 magnetic core; E4 cooling jacket; E5 balance plate; E6 shell; E7 end cover; E8 shaft; E9 bearing;
10衬套；20盘身；21内圈；22外圈；22a内周壁；23叶片；23a凸起；K镂空部；10 bushing; 20 disc body; 21 inner ring; 22 outer ring; 22a inner peripheral wall; 23 blade; 23a protrusion; K hollow part;
A轴向；R径向。A axial; R radial.
具体实施方式detailed description
下面参照附图描述本发明的示例性实施方式。应当理解，这些具体的说明仅用于示教本领域技术人员如何实施本发明，而不用于穷举本发明的所有可行的方式，也不用于限制本发明的范围。Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present invention, and are not used to exhaust all possible ways of the present invention, nor to limit the scope of the present invention.
除非特别说明，参照图3，A表示平衡板的轴向，该轴向A与电机的转子的轴向一致；R表示平衡板的径向，该径向R与电机的转子的径向一致。3, A represents the axial direction of the balance plate, which is consistent with the axial direction of the rotor of the motor; R represents the radial direction of the balance plate, and the radial direction R is consistent with the radial direction of the rotor of the motor.
参照图2至图4介绍根据本发明的平衡板。The balance plate according to the present invention will be described with reference to FIGS. 2 to 4 .
平衡板呈圆盘状，其包括均呈环形的衬套10和盘身20。盘身20套设在衬套10的外周，衬套10和盘身20过盈配合地连接。The balance plate is in the shape of a disc, which includes a bushing 10 and a disc body 20 which are both annular. The disc body 20 is sleeved on the outer periphery of the bushing 10 , and the bushing 10 and the disc body 20 are connected with interference fit.
衬套10用于连接盘身20和与电机的转子同步转动的转轴。优选地，衬套10的制作材料的热膨胀系数与转轴的热膨胀系数接近，于是衬套10在温度发生变化时，不容易与转轴发生松脱。The bushing 10 is used for connecting the disc body 20 and the rotating shaft which rotates synchronously with the rotor of the motor. Preferably, the thermal expansion coefficient of the manufacturing material of the bushing 10 is close to that of the rotating shaft, so that the bushing 10 is not easily loosened from the rotating shaft when the temperature changes.
盘身20包括内圈21、外圈22和多个(本实施方式中为8个)叶片23。The disk body 20 includes an inner ring 21 , an outer ring 22 and a plurality of (eight in this embodiment) vanes 23 .
内圈21位于盘身20的内周部分，外圈22位于盘身20的外周部分，叶片23在径向R上位于内圈21和外圈22之间，且叶片23连接内圈21和外圈22。The inner ring 21 is located on the inner peripheral portion of the disk body 20, the outer ring 22 is located on the outer peripheral portion of the disk body 20, the vanes 23 are located between the inner ring 21 and the outer ring 22 in the radial direction R, and the vanes 23 connect the inner ring 21 and the outer ring 22. Circle 22.
多个叶片23在盘身20的周向上间隔均匀地布置，相邻的叶片23之间形成在轴向A上贯通的镂空部K。The plurality of blades 23 are evenly arranged in the circumferential direction of the disk body 20 , and a hollow portion K penetrating in the axial direction A is formed between adjacent blades 23 .
在本实施方式中，叶片23呈大致矩形形状，表现为：叶片23的主体在垂直于轴向A的截面上具有两个直边，这两个直边均与平衡板的径向R平行。 应当理解，由于叶片23与内圈21和外圈22的相交的边缘呈圆弧状，因此上述大致矩形形状的叶片23并非是完全的矩形形状。In the present embodiment, the vane 23 has a substantially rectangular shape, which means that the main body of the vane 23 has two straight sides on a cross section perpendicular to the axial direction A, both of which are parallel to the radial direction R of the balance plate. It should be understood that since the edges of the vanes 23 that intersect with the inner ring 21 and the outer ring 22 are arc-shaped, the substantially rectangular-shaped vanes 23 described above are not completely rectangular.
参照图3，在本实施方式中，内圈21和外圈22的在轴向A上的每一侧的端面均在轴向A上齐平，且内圈21和外圈22在轴向A上的两侧均超出叶片23的主体。Referring to FIG. 3 , in this embodiment, the end faces of each side of the inner ring 21 and the outer ring 22 in the axial direction A are flush in the axial direction A, and the inner ring 21 and the outer ring 22 are in the axial direction A. Both sides of the upper body extend beyond the body of the blade 23 .
定义该平衡板的在轴向A上用于朝向转子的端部为第一端、背离转子的端部为第二端。The end of the balance plate facing the rotor in the axial direction A is defined as the first end, and the end away from the rotor is defined as the second end.
在第一端处，叶片23凹陷于(或至少部分地凹陷于)内圈21和外圈22，这使得叶片23与转子之间形成供空气流通的空腔，且该空腔与镂空部K相通，于是当平衡板跟随转子转动并搅动空气时，流动的空气能与转子形成大面积的接触。At the first end, the vanes 23 are recessed (or at least partially recessed) in the inner ring 21 and the outer ring 22, which creates a cavity for air circulation between the vanes 23 and the rotor, and the cavity is connected to the hollow part K Therefore, when the balance plate rotates with the rotor and agitates the air, the flowing air can form a large area of contact with the rotor.
优选地，叶片23的靠近第一端的表面为平面。Preferably, the surface of the vane 23 near the first end is flat.
在第二端处，叶片23的表面部分地凸起而形成凸部23a。在平衡板跟随转子转动的过程中，凸部23a能促进电机内部的空气流动。At the second end, the surfaces of the vanes 23 are partially convex to form protrusions 23a. When the balance plate rotates following the rotor, the convex portion 23a can promote the air flow inside the motor.
在本实施方式中，凸部23a在垂直于轴向A的截面上呈X形，且该X形状的两个交叉的条状部分分别沿大致矩形形状的叶片23的对角线延伸。In this embodiment, the convex portion 23a has an X-shape in a cross section perpendicular to the axial direction A, and the two intersecting strip-shaped portions of the X-shape extend along the diagonal lines of the substantially rectangular blade 23, respectively.
优选地，在第二端处，内圈21、外圈22和凸部23a齐平，从而使平衡板不至于占用转子端部过多的空间。Preferably, at the second end, the inner ring 21 , the outer ring 22 and the protrusion 23a are flush, so that the balance plate does not take up too much space at the rotor end.
外圈22的内周壁22a相对于轴向A倾斜，在轴向A上，越靠近第二端、外圈内周壁22a的直径越大。内周壁22a可以为圆锥面的一部分。该倾斜的内周壁22a使得空气在流过平衡板附近时具有更大的沿径向R的分速度。内周壁22a还可以是倒圆角的形式。The inner peripheral wall 22a of the outer ring 22 is inclined with respect to the axial direction A, and the diameter of the inner peripheral wall 22a of the outer ring increases toward the second end in the axial direction A. As shown in FIG. The inner peripheral wall 22a may be a part of the conical surface. The sloping inner peripheral wall 22a allows the air to have a greater component velocity in the radial direction R as it flows near the balance plate. The inner peripheral wall 22a may also be in the form of rounded corners.
应当理解，本发明还提供一种电机，该电机包括转子、定子和至少一个根据本发明的平衡板，平衡板设置于转子的至少一个端部。优选地，电机为内转子电机，转子设置于定子的内周侧。It should be understood that the present invention also provides a motor comprising a rotor, a stator and at least one balance plate according to the present invention, the balance plate being arranged at at least one end of the rotor. Preferably, the motor is an inner rotor motor, and the rotor is arranged on the inner peripheral side of the stator.
使用CFD仿真软件对根据本发明的电机进行仿真试验。试验表明，当电 机空载、转子转速为16000rpm时，电机内部的空气的平均流动速度为17.5m/s，远高于背景技术中介绍的电机内部的空气平均流速。这表明，根据本发明的平衡板促进了电机内部的热对流，试验还表明，从热源部件传递至降温部件的热功率由原先的370w提高到713w，磁芯E3的最高温度从175℃降至157℃。A simulation test of the motor according to the present invention was carried out using CFD simulation software. Experiments show that when the motor is no-load and the rotor speed is 16000rpm, the average flow velocity of the air inside the motor is 17.5m/s, which is much higher than the average air velocity inside the motor described in the background art. This shows that the balance plate according to the present invention promotes thermal convection inside the motor. The test also shows that the thermal power transferred from the heat source component to the cooling component is increased from 370w to 713w, and the maximum temperature of the magnetic core E3 is reduced from 175°C to 713w. 157°C.
表1示出了背景技术中的电机(对比组)与根据本发明的电机在CFD仿真试验中的不同表现。Table 1 shows the different performances of the motor in the background art (comparative group) and the motor according to the present invention in the CFD simulation test.
表1Table 1
Figure PCTCN2020112192-appb-000001
Figure PCTCN2020112192-appb-000001
下面简单说明本发明的上述实施方式的部分有益效果。Some beneficial effects of the above-mentioned embodiments of the present invention are briefly described below.
(i)根据本发明的平衡板由于具有叶片23而能有效促进电机内部的空气的流动；在平衡板的第一端，叶片23与转子之间能形成空腔、加大了空气与转子的接触面积，在平衡板的第二端，凸部23a加强了空气的流动。(i) The balance plate according to the present invention can effectively promote the flow of the air inside the motor because of the blades 23; at the first end of the balance plate, a cavity can be formed between the blades 23 and the rotor, which increases the distance between the air and the rotor. Contact area, at the second end of the balance plate, the protrusion 23a enhances the flow of air.
(ii)外圈22的内周壁22a倾斜地设置，增加了电机内部空气在径向R上的分速度。(ii) The inner peripheral wall 22a of the outer ring 22 is inclined and arranged to increase the component velocity of the air inside the motor in the radial direction R. As shown in FIG.
(iii)由于电机内部空气流动的加强，例如电机的转子和磁芯的热量可以更有效地传递至例如电机的壳体和端盖，电机的温度能得到显著下降。(iii) Due to the enhanced air flow inside the motor, heat such as the rotor and magnetic core of the motor can be more efficiently transferred to, eg, the housing and end caps of the motor, and the temperature of the motor can be significantly reduced.
(iv)根据本发明的平衡板对电机原有平衡板的外形和尺寸的改变较小，可以较好地适应电机总成的其他零部件。(iv) The balance plate according to the present invention changes little to the shape and size of the original balance plate of the motor, and can better adapt to other parts of the motor assembly.
应当理解，上述实施方式仅是示例性的，不用于限制本发明。本领域技术人员可以在本发明的教导下对上述实施方式做出各种变型和改变，而不脱 离本发明的范围。例如，It should be understood that the above-mentioned embodiments are only exemplary, and are not intended to limit the present invention. Various modifications and changes to the above-described embodiments can be made by those skilled in the art under the teachings of the present invention without departing from the scope of the present invention. E.g,
(i)平衡板也可以不具有衬套10，而是直接使盘身20与电机的转动件相连。(i) The balance plate may not have the bushing 10, but directly connect the disk body 20 to the rotating part of the motor.
(ii)电机还可以为外转子(转子位于定子的外周)电机。(ii) The electric machine can also be an outer rotor (rotor is located on the outer circumference of the stator) electric machine.
(iii)本发明对叶片23的数量不作限制。(iii) The present invention does not limit the number of blades 23 .
(iv)本发明对叶片23的形状不作限制，其不必须是大致矩形形状。(iv) The present invention does not limit the shape of the blade 23, and it does not have to be a substantially rectangular shape.
(v)本发明对凸部23a的形状不作限制，其不必须是X形。(v) The present invention does not limit the shape of the convex portion 23a, and it does not have to be an X-shape.
(vi)虽然根据本发明的平衡板优选用于永磁同步电机，但本发明对此不作限制，该平衡板也可以用于其它类型的电机。(vi) Although the balance plate according to the present invention is preferably used in a permanent magnet synchronous motor, the invention is not limited thereto, and the balance plate can also be used in other types of motors.

Claims (14)

  1. 一种平衡板，其用于设置在电机的转子的轴向(A)上的端部、并与所述转子不能相对转动地连接，所述平衡板呈圆盘形，所述平衡板在所述轴向(A)上具有用于朝向所述转子的第一端和背离所述转子的第二端，其中，A balance plate is used for being arranged at the end of the rotor of a motor in the axial direction (A), and is connected with the rotor in a non-rotatable manner, the balance plate is in the shape of a disc, and the balance plate is in the shape of a disc. The axial direction (A) has a first end facing the rotor and a second end facing away from the rotor, wherein,
    所述平衡板包括内圈(21)、外圈(22)和多个叶片(23)，The balance plate includes an inner ring (21), an outer ring (22) and a plurality of blades (23),
    所述内圈(21)和所述外圈(22)均呈环状，且所述外圈(22)位于所述内圈(21)的外周侧，在所述平衡板的径向(R)上，所述叶片(23)连接所述内圈(21)和所述外圈(22)，Both the inner ring (21) and the outer ring (22) are annular, and the outer ring (22) is located on the outer peripheral side of the inner ring (21), in the radial direction (R) of the balance plate. ), the blade (23) connects the inner ring (21) and the outer ring (22),
    所述多个叶片(23)在所述平衡板的周向上间隔开地排布，相邻的所述叶片(23)之间形成在所述平衡板的轴向(A)上贯通的镂空部(K)。The plurality of vanes (23) are arranged at intervals in the circumferential direction of the balance plate, and a hollow portion penetrating in the axial direction (A) of the balance plate is formed between adjacent vanes (23) (K).
  2. 根据权利要求1所述的平衡板，其特征在于，所述叶片(23)的靠近所述第二端的表面部分地凸出而形成凸部(23a)。The balance plate according to claim 1, wherein a surface of the blade (23) close to the second end is partially convex to form a convex portion (23a).
  3. 根据权利要求2所述的平衡板，其特征在于，沿所述轴向(A)观察，所述凸部(23a)呈X形。The balance plate according to claim 2, characterized in that, when viewed along the axial direction (A), the convex portion (23a) is in an X-shape.
  4. 根据权利要求2所述的平衡板，其特征在于，在所述轴向(A)上，所述凸部(23a)不超出所述内圈(21)和/或所述外圈(22)。The balance plate according to claim 2, characterized in that, in the axial direction (A), the convex portion (23a) does not exceed the inner ring (21) and/or the outer ring (22) .
  5. 根据权利要求2所述的平衡板，其特征在于，在所述轴向(A)上，所述凸部(23a)与所述内圈(21)和/或所述外圈(22)齐平。The balance plate according to claim 2, characterized in that, in the axial direction (A), the convex portion (23a) is aligned with the inner ring (21) and/or the outer ring (22) flat.
  6. 根据权利要求1所述的平衡板，其特征在于，所述叶片(23)在垂直于所述轴向(A)的截面上具有两个直边，所述两个直边均与所述平衡板的径向(R)平行。The balance plate according to claim 1, wherein the blade (23) has two straight sides on a section perpendicular to the axial direction (A), and the two straight sides are both connected to the balance plate The radial direction (R) of the plates is parallel.
  7. 根据权利要求1所述的平衡板，其特征在于，在所述轴向(A)上，所述内圈(21)和/或所述外圈(22)的靠近所述第一端的表面超出所述叶片(23)的靠近所述第一端的表面。The balance plate according to claim 1, characterized in that, in the axial direction (A), the surface of the inner ring (21) and/or the outer ring (22) close to the first end beyond the surface of the vane (23) near the first end.
  8. 根据权利要求1所述的平衡板，其特征在于，所述叶片(23)的靠近 所述第一端的表面为平面。The balance plate of claim 1, wherein the surface of the blade (23) close to the first end is flat.
  9. 根据权利要求1所述的平衡板，其特征在于，在所述轴向(A)上，越靠近所述第二端、所述外圈(22)的内周壁(22a)的直径越大。The balance plate according to claim 1, characterized in that, in the axial direction (A), the diameter of the inner peripheral wall (22a) of the outer ring (22) increases as it approaches the second end.
  10. 根据权利要求9所述的平衡板，其特征在于，所述内周壁(22a)为锥面或球面的一部分。The balance plate according to claim 9, wherein the inner peripheral wall (22a) is a part of a conical surface or a spherical surface.
  11. 根据权利要求1所述的平衡板，其特征在于，所述叶片(23)有8个，8个所述叶片(23)在所述周向上均匀分布。The balance plate according to claim 1, characterized in that, there are eight blades (23), and the eight blades (23) are evenly distributed in the circumferential direction.
  12. 根据权利要求1至10中任一项所述的平衡板，其特征在于，所述平衡板还包括环形的衬套(10)，所述衬套(10)与所述内圈(21)过盈配合地安装于所述内圈(21)的内周侧。The balance plate according to any one of claims 1 to 10, characterized in that, the balance plate further comprises an annular bushing (10), the bushing (10) passing through the inner ring (21) It is installed on the inner peripheral side of the inner ring (21) in an interference fit.
  13. 一种电机，其包括转子、定子和平衡板，所述转子能相对于所述定子转动，所述平衡板与所述转子不能相对转动地设置于所述转子的轴向(A)上的至少一个端面，其特征在于，A motor comprising a rotor, a stator and a balance plate, the rotor can rotate relative to the stator, and the balance plate and the rotor are arranged at least on the axial direction (A) of the rotor so as to be non-rotatable relative to the rotor. an end face characterized by,
    所述平衡板为根据权利要求1至12中任一项所述的平衡板。The balance plate is the balance plate according to any one of claims 1 to 12.
  14. 根据权利要求13所述的电机，其特征在于，所述转子位于所述定子的内周侧。The motor according to claim 13, wherein the rotor is located on the inner peripheral side of the stator.
PCT/CN2020/112192 2020-08-28 2020-08-28 Balancing plate and electric motor WO2022041136A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201733178U (en) * 2010-03-19 2011-02-02 永济新时速电机电器有限责任公司 Wind-guiding balance disc and generator
CN207459903U (en) * 2017-11-03 2018-06-05 长城汽车股份有限公司 Motor and its rotor balancing plate
CN109861446A (en) * 2019-02-18 2019-06-07 浙江龙芯电驱动科技有限公司 The cooling hardened structure of rotor dynamic balancing in a kind of motor
US20190331135A1 (en) * 2018-04-26 2019-10-31 Acer Incorporated Fan And Balance Ring For Fan

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201733178U (en) * 2010-03-19 2011-02-02 永济新时速电机电器有限责任公司 Wind-guiding balance disc and generator
CN207459903U (en) * 2017-11-03 2018-06-05 长城汽车股份有限公司 Motor and its rotor balancing plate
US20190331135A1 (en) * 2018-04-26 2019-10-31 Acer Incorporated Fan And Balance Ring For Fan
CN109861446A (en) * 2019-02-18 2019-06-07 浙江龙芯电驱动科技有限公司 The cooling hardened structure of rotor dynamic balancing in a kind of motor

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